1 | package AnyEvent::Handle; |
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2 | |
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3 | no warnings; |
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4 | use strict; |
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5 | |
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6 | use AnyEvent (); |
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7 | use AnyEvent::Util qw(WSAWOULDBLOCK); |
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8 | use Scalar::Util (); |
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9 | use Carp (); |
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10 | use Fcntl (); |
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11 | use Errno qw/EAGAIN EINTR/; |
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12 | |
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13 | =head1 NAME |
1 | =head1 NAME |
14 | |
2 | |
15 | AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent |
3 | AnyEvent::Handle - non-blocking I/O on streaming handles via AnyEvent |
16 | |
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17 | =cut |
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18 | |
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19 | our $VERSION = '0.04'; |
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20 | |
4 | |
21 | =head1 SYNOPSIS |
5 | =head1 SYNOPSIS |
22 | |
6 | |
23 | use AnyEvent; |
7 | use AnyEvent; |
24 | use AnyEvent::Handle; |
8 | use AnyEvent::Handle; |
25 | |
9 | |
26 | my $cv = AnyEvent->condvar; |
10 | my $cv = AnyEvent->condvar; |
27 | |
11 | |
28 | my $handle = |
12 | my $hdl; $hdl = new AnyEvent::Handle |
29 | AnyEvent::Handle->new ( |
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30 | fh => \*STDIN, |
13 | fh => \*STDIN, |
31 | on_eof => sub { |
14 | on_error => sub { |
32 | $cv->broadcast; |
15 | my ($hdl, $fatal, $msg) = @_; |
33 | }, |
16 | AE::log error => "got error $msg\n"; |
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17 | $hdl->destroy; |
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18 | $cv->send; |
34 | ); |
19 | }; |
35 | |
20 | |
36 | # send some request line |
21 | # send some request line |
37 | $handle->push_write ("getinfo\015\012"); |
22 | $hdl->push_write ("getinfo\015\012"); |
38 | |
23 | |
39 | # read the response line |
24 | # read the response line |
40 | $handle->push_read (line => sub { |
25 | $hdl->push_read (line => sub { |
41 | my ($handle, $line) = @_; |
26 | my ($hdl, $line) = @_; |
42 | warn "read line <$line>\n"; |
27 | say "got line <$line>"; |
43 | $cv->send; |
28 | $cv->send; |
44 | }); |
29 | }); |
45 | |
30 | |
46 | $cv->recv; |
31 | $cv->recv; |
47 | |
32 | |
48 | =head1 DESCRIPTION |
33 | =head1 DESCRIPTION |
49 | |
34 | |
50 | This module is a helper module to make it easier to do event-based I/O on |
35 | This is a helper module to make it easier to do event-based I/O on |
51 | filehandles. For utility functions for doing non-blocking connects and accepts |
36 | stream-based filehandles (sockets, pipes, and other stream things). |
52 | on sockets see L<AnyEvent::Util>. |
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53 | |
37 | |
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38 | The L<AnyEvent::Intro> tutorial contains some well-documented |
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39 | AnyEvent::Handle examples. |
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40 | |
54 | In the following, when the documentation refers to of "bytes" then this |
41 | In the following, where the documentation refers to "bytes", it means |
55 | means characters. As sysread and syswrite are used for all I/O, their |
42 | characters. As sysread and syswrite are used for all I/O, their |
56 | treatment of characters applies to this module as well. |
43 | treatment of characters applies to this module as well. |
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44 | |
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45 | At the very minimum, you should specify C<fh> or C<connect>, and the |
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46 | C<on_error> callback. |
57 | |
47 | |
58 | All callbacks will be invoked with the handle object as their first |
48 | All callbacks will be invoked with the handle object as their first |
59 | argument. |
49 | argument. |
60 | |
50 | |
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51 | =cut |
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52 | |
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53 | package AnyEvent::Handle; |
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54 | |
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55 | use Scalar::Util (); |
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56 | use List::Util (); |
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57 | use Carp (); |
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58 | use Errno qw(EAGAIN EINTR); |
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59 | |
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60 | use AnyEvent (); BEGIN { AnyEvent::common_sense } |
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61 | use AnyEvent::Util qw(WSAEWOULDBLOCK); |
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62 | |
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63 | our $VERSION = $AnyEvent::VERSION; |
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64 | |
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65 | sub _load_func($) { |
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66 | my $func = $_[0]; |
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67 | |
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68 | unless (defined &$func) { |
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69 | my $pkg = $func; |
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70 | do { |
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71 | $pkg =~ s/::[^:]+$// |
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72 | or return; |
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73 | eval "require $pkg"; |
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74 | } until defined &$func; |
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75 | } |
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76 | |
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77 | \&$func |
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78 | } |
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79 | |
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80 | sub MAX_READ_SIZE() { 131072 } |
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81 | |
61 | =head1 METHODS |
82 | =head1 METHODS |
62 | |
83 | |
63 | =over 4 |
84 | =over 4 |
64 | |
85 | |
65 | =item B<new (%args)> |
86 | =item $handle = B<new> AnyEvent::Handle fh => $filehandle, key => value... |
66 | |
87 | |
67 | The constructor supports these arguments (all as key => value pairs). |
88 | The constructor supports these arguments (all as C<< key => value >> pairs). |
68 | |
89 | |
69 | =over 4 |
90 | =over 4 |
70 | |
91 | |
71 | =item fh => $filehandle [MANDATORY] |
92 | =item fh => $filehandle [C<fh> or C<connect> MANDATORY] |
72 | |
93 | |
73 | The filehandle this L<AnyEvent::Handle> object will operate on. |
94 | The filehandle this L<AnyEvent::Handle> object will operate on. |
74 | |
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75 | NOTE: The filehandle will be set to non-blocking (using |
95 | NOTE: The filehandle will be set to non-blocking mode (using |
76 | AnyEvent::Util::fh_nonblocking). |
96 | C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in |
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97 | that mode. |
77 | |
98 | |
78 | =item on_eof => $cb->($handle) |
99 | =item connect => [$host, $service] [C<fh> or C<connect> MANDATORY] |
79 | |
100 | |
80 | Set the callback to be called on EOF. |
101 | Try to connect to the specified host and service (port), using |
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102 | C<AnyEvent::Socket::tcp_connect>. The C<$host> additionally becomes the |
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103 | default C<peername>. |
81 | |
104 | |
82 | While not mandatory, it is highly recommended to set an eof callback, |
105 | You have to specify either this parameter, or C<fh>, above. |
83 | otherwise you might end up with a closed socket while you are still |
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84 | waiting for data. |
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85 | |
106 | |
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107 | It is possible to push requests on the read and write queues, and modify |
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108 | properties of the stream, even while AnyEvent::Handle is connecting. |
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109 | |
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110 | When this parameter is specified, then the C<on_prepare>, |
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111 | C<on_connect_error> and C<on_connect> callbacks will be called under the |
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112 | appropriate circumstances: |
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113 | |
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114 | =over 4 |
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115 | |
86 | =item on_error => $cb->($handle) |
116 | =item on_prepare => $cb->($handle) |
87 | |
117 | |
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118 | This (rarely used) callback is called before a new connection is |
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119 | attempted, but after the file handle has been created (you can access that |
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120 | file handle via C<< $handle->{fh} >>). It could be used to prepare the |
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121 | file handle with parameters required for the actual connect (as opposed to |
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122 | settings that can be changed when the connection is already established). |
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123 | |
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124 | The return value of this callback should be the connect timeout value in |
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125 | seconds (or C<0>, or C<undef>, or the empty list, to indicate that the |
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126 | default timeout is to be used). |
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127 | |
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128 | =item on_connect => $cb->($handle, $host, $port, $retry->()) |
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129 | |
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130 | This callback is called when a connection has been successfully established. |
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131 | |
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132 | The peer's numeric host and port (the socket peername) are passed as |
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133 | parameters, together with a retry callback. |
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134 | |
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135 | If, for some reason, the handle is not acceptable, calling C<$retry> |
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136 | will continue with the next connection target (in case of multi-homed |
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137 | hosts or SRV records there can be multiple connection endpoints). At the |
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138 | time it is called the read and write queues, eof status, tls status and |
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139 | similar properties of the handle will have been reset. |
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140 | |
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141 | In most cases, you should ignore the C<$retry> parameter. |
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142 | |
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143 | =item on_connect_error => $cb->($handle, $message) |
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144 | |
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145 | This callback is called when the connection could not be |
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146 | established. C<$!> will contain the relevant error code, and C<$message> a |
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147 | message describing it (usually the same as C<"$!">). |
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148 | |
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149 | If this callback isn't specified, then C<on_error> will be called with a |
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150 | fatal error instead. |
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151 | |
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152 | =back |
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153 | |
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154 | =item on_error => $cb->($handle, $fatal, $message) |
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155 | |
88 | This is the fatal error callback, that is called when, well, a fatal error |
156 | This is the error callback, which is called when, well, some error |
89 | occurs, such as not being able to resolve the hostname, failure to connect |
157 | occured, such as not being able to resolve the hostname, failure to |
90 | or a read error. |
158 | connect, or a read error. |
91 | |
159 | |
92 | The object will not be in a usable state when this callback has been |
160 | Some errors are fatal (which is indicated by C<$fatal> being true). On |
93 | called. |
161 | fatal errors the handle object will be destroyed (by a call to C<< -> |
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162 | destroy >>) after invoking the error callback (which means you are free to |
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163 | examine the handle object). Examples of fatal errors are an EOF condition |
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164 | with active (but unsatisfiable) read watchers (C<EPIPE>) or I/O errors. In |
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165 | cases where the other side can close the connection at will, it is |
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166 | often easiest to not report C<EPIPE> errors in this callback. |
94 | |
167 | |
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168 | AnyEvent::Handle tries to find an appropriate error code for you to check |
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169 | against, but in some cases (TLS errors), this does not work well. It is |
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170 | recommended to always output the C<$message> argument in human-readable |
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171 | error messages (it's usually the same as C<"$!">). |
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172 | |
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173 | Non-fatal errors can be retried by returning, but it is recommended |
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174 | to simply ignore this parameter and instead abondon the handle object |
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175 | when this callback is invoked. Examples of non-fatal errors are timeouts |
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176 | C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>). |
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177 | |
95 | On callback entrance, the value of C<$!> contains the operating system |
178 | On entry to the callback, the value of C<$!> contains the operating |
96 | error (or C<ENOSPC>, C<EPIPE> or C<EBADMSG>). |
179 | system error code (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT>, C<EBADMSG> or |
97 | |
180 | C<EPROTO>). |
98 | The callback should throw an exception. If it returns, then |
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99 | AnyEvent::Handle will C<croak> for you. |
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100 | |
181 | |
101 | While not mandatory, it is I<highly> recommended to set this callback, as |
182 | While not mandatory, it is I<highly> recommended to set this callback, as |
102 | you will not be notified of errors otherwise. The default simply calls |
183 | you will not be notified of errors otherwise. The default just calls |
103 | die. |
184 | C<croak>. |
104 | |
185 | |
105 | =item on_read => $cb->($handle) |
186 | =item on_read => $cb->($handle) |
106 | |
187 | |
107 | This sets the default read callback, which is called when data arrives |
188 | This sets the default read callback, which is called when data arrives |
108 | and no read request is in the queue. |
189 | and no read request is in the queue (unlike read queue callbacks, this |
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190 | callback will only be called when at least one octet of data is in the |
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191 | read buffer). |
109 | |
192 | |
110 | To access (and remove data from) the read buffer, use the C<< ->rbuf >> |
193 | To access (and remove data from) the read buffer, use the C<< ->rbuf >> |
111 | method or access the C<$handle->{rbuf}> member directly. |
194 | method or access the C<< $handle->{rbuf} >> member directly. Note that you |
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195 | must not enlarge or modify the read buffer, you can only remove data at |
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196 | the beginning from it. |
112 | |
197 | |
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198 | You can also call C<< ->push_read (...) >> or any other function that |
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199 | modifies the read queue. Or do both. Or ... |
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200 | |
113 | When an EOF condition is detected then AnyEvent::Handle will first try to |
201 | When an EOF condition is detected, AnyEvent::Handle will first try to |
114 | feed all the remaining data to the queued callbacks and C<on_read> before |
202 | feed all the remaining data to the queued callbacks and C<on_read> before |
115 | calling the C<on_eof> callback. If no progress can be made, then a fatal |
203 | calling the C<on_eof> callback. If no progress can be made, then a fatal |
116 | error will be raised (with C<$!> set to C<EPIPE>). |
204 | error will be raised (with C<$!> set to C<EPIPE>). |
117 | |
205 | |
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206 | Note that, unlike requests in the read queue, an C<on_read> callback |
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207 | doesn't mean you I<require> some data: if there is an EOF and there |
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208 | are outstanding read requests then an error will be flagged. With an |
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209 | C<on_read> callback, the C<on_eof> callback will be invoked. |
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210 | |
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211 | =item on_eof => $cb->($handle) |
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212 | |
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213 | Set the callback to be called when an end-of-file condition is detected, |
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214 | i.e. in the case of a socket, when the other side has closed the |
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215 | connection cleanly, and there are no outstanding read requests in the |
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216 | queue (if there are read requests, then an EOF counts as an unexpected |
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217 | connection close and will be flagged as an error). |
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218 | |
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219 | For sockets, this just means that the other side has stopped sending data, |
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220 | you can still try to write data, and, in fact, one can return from the EOF |
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221 | callback and continue writing data, as only the read part has been shut |
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222 | down. |
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223 | |
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224 | If an EOF condition has been detected but no C<on_eof> callback has been |
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225 | set, then a fatal error will be raised with C<$!> set to <0>. |
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226 | |
118 | =item on_drain => $cb->($handle) |
227 | =item on_drain => $cb->($handle) |
119 | |
228 | |
120 | This sets the callback that is called when the write buffer becomes empty |
229 | This sets the callback that is called when the write buffer becomes empty |
121 | (or when the callback is set and the buffer is empty already). |
230 | (or immediately if the buffer is empty already). |
122 | |
231 | |
123 | To append to the write buffer, use the C<< ->push_write >> method. |
232 | To append to the write buffer, use the C<< ->push_write >> method. |
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233 | |
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234 | This callback is useful when you don't want to put all of your write data |
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235 | into the queue at once, for example, when you want to write the contents |
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236 | of some file to the socket you might not want to read the whole file into |
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237 | memory and push it into the queue, but instead only read more data from |
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238 | the file when the write queue becomes empty. |
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239 | |
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240 | =item timeout => $fractional_seconds |
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241 | |
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242 | =item rtimeout => $fractional_seconds |
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243 | |
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244 | =item wtimeout => $fractional_seconds |
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245 | |
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246 | If non-zero, then these enables an "inactivity" timeout: whenever this |
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247 | many seconds pass without a successful read or write on the underlying |
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248 | file handle (or a call to C<timeout_reset>), the C<on_timeout> callback |
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249 | will be invoked (and if that one is missing, a non-fatal C<ETIMEDOUT> |
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250 | error will be raised). |
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251 | |
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252 | There are three variants of the timeouts that work independently of each |
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253 | other, for both read and write (triggered when nothing was read I<OR> |
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254 | written), just read (triggered when nothing was read), and just write: |
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255 | C<timeout>, C<rtimeout> and C<wtimeout>, with corresponding callbacks |
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256 | C<on_timeout>, C<on_rtimeout> and C<on_wtimeout>, and reset functions |
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257 | C<timeout_reset>, C<rtimeout_reset>, and C<wtimeout_reset>. |
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258 | |
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259 | Note that timeout processing is active even when you do not have any |
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260 | outstanding read or write requests: If you plan to keep the connection |
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261 | idle then you should disable the timeout temporarily or ignore the |
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262 | timeout in the corresponding C<on_timeout> callback, in which case |
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263 | AnyEvent::Handle will simply restart the timeout. |
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264 | |
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265 | Zero (the default) disables the corresponding timeout. |
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266 | |
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267 | =item on_timeout => $cb->($handle) |
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268 | |
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269 | =item on_rtimeout => $cb->($handle) |
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270 | |
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271 | =item on_wtimeout => $cb->($handle) |
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272 | |
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273 | Called whenever the inactivity timeout passes. If you return from this |
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274 | callback, then the timeout will be reset as if some activity had happened, |
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275 | so this condition is not fatal in any way. |
124 | |
276 | |
125 | =item rbuf_max => <bytes> |
277 | =item rbuf_max => <bytes> |
126 | |
278 | |
127 | If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>) |
279 | If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>) |
128 | when the read buffer ever (strictly) exceeds this size. This is useful to |
280 | when the read buffer ever (strictly) exceeds this size. This is useful to |
129 | avoid denial-of-service attacks. |
281 | avoid some forms of denial-of-service attacks. |
130 | |
282 | |
131 | For example, a server accepting connections from untrusted sources should |
283 | For example, a server accepting connections from untrusted sources should |
132 | be configured to accept only so-and-so much data that it cannot act on |
284 | be configured to accept only so-and-so much data that it cannot act on |
133 | (for example, when expecting a line, an attacker could send an unlimited |
285 | (for example, when expecting a line, an attacker could send an unlimited |
134 | amount of data without a callback ever being called as long as the line |
286 | amount of data without a callback ever being called as long as the line |
135 | isn't finished). |
287 | isn't finished). |
136 | |
288 | |
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289 | =item wbuf_max => <bytes> |
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290 | |
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291 | If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>) |
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292 | when the write buffer ever (strictly) exceeds this size. This is useful to |
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293 | avoid some forms of denial-of-service attacks. |
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294 | |
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295 | Although the units of this parameter is bytes, this is the I<raw> number |
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296 | of bytes not yet accepted by the kernel. This can make a difference when |
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297 | you e.g. use TLS, as TLS typically makes your write data larger (but it |
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298 | can also make it smaller due to compression). |
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299 | |
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300 | As an example of when this limit is useful, take a chat server that sends |
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301 | chat messages to a client. If the client does not read those in a timely |
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302 | manner then the send buffer in the server would grow unbounded. |
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303 | |
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304 | =item autocork => <boolean> |
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305 | |
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306 | When disabled (the default), C<push_write> will try to immediately |
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307 | write the data to the handle if possible. This avoids having to register |
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308 | a write watcher and wait for the next event loop iteration, but can |
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309 | be inefficient if you write multiple small chunks (on the wire, this |
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310 | disadvantage is usually avoided by your kernel's nagle algorithm, see |
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311 | C<no_delay>, but this option can save costly syscalls). |
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312 | |
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313 | When enabled, writes will always be queued till the next event loop |
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314 | iteration. This is efficient when you do many small writes per iteration, |
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315 | but less efficient when you do a single write only per iteration (or when |
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316 | the write buffer often is full). It also increases write latency. |
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317 | |
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318 | =item no_delay => <boolean> |
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319 | |
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320 | When doing small writes on sockets, your operating system kernel might |
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321 | wait a bit for more data before actually sending it out. This is called |
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322 | the Nagle algorithm, and usually it is beneficial. |
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323 | |
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324 | In some situations you want as low a delay as possible, which can be |
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325 | accomplishd by setting this option to a true value. |
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326 | |
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327 | The default is your operating system's default behaviour (most likely |
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328 | enabled). This option explicitly enables or disables it, if possible. |
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329 | |
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330 | =item keepalive => <boolean> |
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331 | |
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332 | Enables (default disable) the SO_KEEPALIVE option on the stream socket: |
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333 | normally, TCP connections have no time-out once established, so TCP |
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334 | connections, once established, can stay alive forever even when the other |
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335 | side has long gone. TCP keepalives are a cheap way to take down long-lived |
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336 | TCP connections when the other side becomes unreachable. While the default |
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337 | is OS-dependent, TCP keepalives usually kick in after around two hours, |
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338 | and, if the other side doesn't reply, take down the TCP connection some 10 |
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339 | to 15 minutes later. |
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340 | |
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341 | It is harmless to specify this option for file handles that do not support |
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342 | keepalives, and enabling it on connections that are potentially long-lived |
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343 | is usually a good idea. |
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344 | |
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345 | =item oobinline => <boolean> |
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346 | |
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347 | BSD majorly fucked up the implementation of TCP urgent data. The result |
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348 | is that almost no OS implements TCP according to the specs, and every OS |
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349 | implements it slightly differently. |
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350 | |
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351 | If you want to handle TCP urgent data, then setting this flag (the default |
|
|
352 | is enabled) gives you the most portable way of getting urgent data, by |
|
|
353 | putting it into the stream. |
|
|
354 | |
|
|
355 | Since BSD emulation of OOB data on top of TCP's urgent data can have |
|
|
356 | security implications, AnyEvent::Handle sets this flag automatically |
|
|
357 | unless explicitly specified. Note that setting this flag after |
|
|
358 | establishing a connection I<may> be a bit too late (data loss could |
|
|
359 | already have occured on BSD systems), but at least it will protect you |
|
|
360 | from most attacks. |
|
|
361 | |
137 | =item read_size => <bytes> |
362 | =item read_size => <bytes> |
138 | |
363 | |
139 | The default read block size (the amount of bytes this module will try to read |
364 | The initial read block size, the number of bytes this module will try |
140 | on each [loop iteration). Default: C<4096>. |
365 | to read during each loop iteration. Each handle object will consume |
|
|
366 | at least this amount of memory for the read buffer as well, so when |
|
|
367 | handling many connections watch out for memory requirements). See also |
|
|
368 | C<max_read_size>. Default: C<2048>. |
|
|
369 | |
|
|
370 | =item max_read_size => <bytes> |
|
|
371 | |
|
|
372 | The maximum read buffer size used by the dynamic adjustment |
|
|
373 | algorithm: Each time AnyEvent::Handle can read C<read_size> bytes in |
|
|
374 | one go it will double C<read_size> up to the maximum given by this |
|
|
375 | option. Default: C<131072> or C<read_size>, whichever is higher. |
141 | |
376 | |
142 | =item low_water_mark => <bytes> |
377 | =item low_water_mark => <bytes> |
143 | |
378 | |
144 | Sets the amount of bytes (default: C<0>) that make up an "empty" write |
379 | Sets the number of bytes (default: C<0>) that make up an "empty" write |
145 | buffer: If the write reaches this size or gets even samller it is |
380 | buffer: If the buffer reaches this size or gets even samller it is |
146 | considered empty. |
381 | considered empty. |
147 | |
382 | |
|
|
383 | Sometimes it can be beneficial (for performance reasons) to add data to |
|
|
384 | the write buffer before it is fully drained, but this is a rare case, as |
|
|
385 | the operating system kernel usually buffers data as well, so the default |
|
|
386 | is good in almost all cases. |
|
|
387 | |
|
|
388 | =item linger => <seconds> |
|
|
389 | |
|
|
390 | If this is non-zero (default: C<3600>), the destructor of the |
|
|
391 | AnyEvent::Handle object will check whether there is still outstanding |
|
|
392 | write data and will install a watcher that will write this data to the |
|
|
393 | socket. No errors will be reported (this mostly matches how the operating |
|
|
394 | system treats outstanding data at socket close time). |
|
|
395 | |
|
|
396 | This will not work for partial TLS data that could not be encoded |
|
|
397 | yet. This data will be lost. Calling the C<stoptls> method in time might |
|
|
398 | help. |
|
|
399 | |
|
|
400 | =item peername => $string |
|
|
401 | |
|
|
402 | A string used to identify the remote site - usually the DNS hostname |
|
|
403 | (I<not> IDN!) used to create the connection, rarely the IP address. |
|
|
404 | |
|
|
405 | Apart from being useful in error messages, this string is also used in TLS |
|
|
406 | peername verification (see C<verify_peername> in L<AnyEvent::TLS>). This |
|
|
407 | verification will be skipped when C<peername> is not specified or is |
|
|
408 | C<undef>. |
|
|
409 | |
148 | =item tls => "accept" | "connect" | Net::SSLeay::SSL object |
410 | =item tls => "accept" | "connect" | Net::SSLeay::SSL object |
149 | |
411 | |
150 | When this parameter is given, it enables TLS (SSL) mode, that means it |
412 | When this parameter is given, it enables TLS (SSL) mode, that means |
151 | will start making tls handshake and will transparently encrypt/decrypt |
413 | AnyEvent will start a TLS handshake as soon as the connection has been |
152 | data. |
414 | established and will transparently encrypt/decrypt data afterwards. |
|
|
415 | |
|
|
416 | All TLS protocol errors will be signalled as C<EPROTO>, with an |
|
|
417 | appropriate error message. |
153 | |
418 | |
154 | TLS mode requires Net::SSLeay to be installed (it will be loaded |
419 | TLS mode requires Net::SSLeay to be installed (it will be loaded |
155 | automatically when you try to create a TLS handle). |
420 | automatically when you try to create a TLS handle): this module doesn't |
|
|
421 | have a dependency on that module, so if your module requires it, you have |
|
|
422 | to add the dependency yourself. |
156 | |
423 | |
157 | For the TLS server side, use C<accept>, and for the TLS client side of a |
424 | Unlike TCP, TLS has a server and client side: for the TLS server side, use |
158 | connection, use C<connect> mode. |
425 | C<accept>, and for the TLS client side of a connection, use C<connect> |
|
|
426 | mode. |
159 | |
427 | |
160 | You can also provide your own TLS connection object, but you have |
428 | You can also provide your own TLS connection object, but you have |
161 | to make sure that you call either C<Net::SSLeay::set_connect_state> |
429 | to make sure that you call either C<Net::SSLeay::set_connect_state> |
162 | or C<Net::SSLeay::set_accept_state> on it before you pass it to |
430 | or C<Net::SSLeay::set_accept_state> on it before you pass it to |
163 | AnyEvent::Handle. |
431 | AnyEvent::Handle. Also, this module will take ownership of this connection |
|
|
432 | object. |
164 | |
433 | |
|
|
434 | At some future point, AnyEvent::Handle might switch to another TLS |
|
|
435 | implementation, then the option to use your own session object will go |
|
|
436 | away. |
|
|
437 | |
|
|
438 | B<IMPORTANT:> since Net::SSLeay "objects" are really only integers, |
|
|
439 | passing in the wrong integer will lead to certain crash. This most often |
|
|
440 | happens when one uses a stylish C<< tls => 1 >> and is surprised about the |
|
|
441 | segmentation fault. |
|
|
442 | |
165 | See the C<starttls> method if you need to start TLs negotiation later. |
443 | Use the C<< ->starttls >> method if you need to start TLS negotiation later. |
166 | |
444 | |
167 | =item tls_ctx => $ssl_ctx |
445 | =item tls_ctx => $anyevent_tls |
168 | |
446 | |
169 | Use the given Net::SSLeay::CTX object to create the new TLS connection |
447 | Use the given C<AnyEvent::TLS> object to create the new TLS connection |
170 | (unless a connection object was specified directly). If this parameter is |
448 | (unless a connection object was specified directly). If this |
171 | missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>. |
449 | parameter is missing (or C<undef>), then AnyEvent::Handle will use |
|
|
450 | C<AnyEvent::Handle::TLS_CTX>. |
|
|
451 | |
|
|
452 | Instead of an object, you can also specify a hash reference with C<< key |
|
|
453 | => value >> pairs. Those will be passed to L<AnyEvent::TLS> to create a |
|
|
454 | new TLS context object. |
|
|
455 | |
|
|
456 | =item on_starttls => $cb->($handle, $success[, $error_message]) |
|
|
457 | |
|
|
458 | This callback will be invoked when the TLS/SSL handshake has finished. If |
|
|
459 | C<$success> is true, then the TLS handshake succeeded, otherwise it failed |
|
|
460 | (C<on_stoptls> will not be called in this case). |
|
|
461 | |
|
|
462 | The session in C<< $handle->{tls} >> can still be examined in this |
|
|
463 | callback, even when the handshake was not successful. |
|
|
464 | |
|
|
465 | TLS handshake failures will not cause C<on_error> to be invoked when this |
|
|
466 | callback is in effect, instead, the error message will be passed to C<on_starttls>. |
|
|
467 | |
|
|
468 | Without this callback, handshake failures lead to C<on_error> being |
|
|
469 | called as usual. |
|
|
470 | |
|
|
471 | Note that you cannot just call C<starttls> again in this callback. If you |
|
|
472 | need to do that, start an zero-second timer instead whose callback can |
|
|
473 | then call C<< ->starttls >> again. |
|
|
474 | |
|
|
475 | =item on_stoptls => $cb->($handle) |
|
|
476 | |
|
|
477 | When a SSLv3/TLS shutdown/close notify/EOF is detected and this callback is |
|
|
478 | set, then it will be invoked after freeing the TLS session. If it is not, |
|
|
479 | then a TLS shutdown condition will be treated like a normal EOF condition |
|
|
480 | on the handle. |
|
|
481 | |
|
|
482 | The session in C<< $handle->{tls} >> can still be examined in this |
|
|
483 | callback. |
|
|
484 | |
|
|
485 | This callback will only be called on TLS shutdowns, not when the |
|
|
486 | underlying handle signals EOF. |
172 | |
487 | |
173 | =item json => JSON or JSON::XS object |
488 | =item json => JSON or JSON::XS object |
174 | |
489 | |
175 | This is the json coder object used by the C<json> read and write types. |
490 | This is the json coder object used by the C<json> read and write types. |
176 | |
491 | |
177 | If you don't supply it, then AnyEvent::Handle will use C<encode_json> and |
492 | If you don't supply it, then AnyEvent::Handle will create and use a |
178 | C<decode_json>. |
493 | suitable one (on demand), which will write and expect UTF-8 encoded JSON |
|
|
494 | texts. |
179 | |
495 | |
180 | Note that you are responsible to depend on the JSON module if you want to |
496 | Note that you are responsible to depend on the JSON module if you want to |
181 | use this functionality, as AnyEvent does not have a dependency itself. |
497 | use this functionality, as AnyEvent does not have a dependency itself. |
182 | |
498 | |
183 | =item filter_r => $cb |
|
|
184 | |
|
|
185 | =item filter_w => $cb |
|
|
186 | |
|
|
187 | These exist, but are undocumented at this time. |
|
|
188 | |
|
|
189 | =back |
499 | =back |
190 | |
500 | |
191 | =cut |
501 | =cut |
192 | |
502 | |
193 | sub new { |
503 | sub new { |
194 | my $class = shift; |
504 | my $class = shift; |
195 | |
|
|
196 | my $self = bless { @_ }, $class; |
505 | my $self = bless { @_ }, $class; |
197 | |
506 | |
198 | $self->{fh} or Carp::croak "mandatory argument fh is missing"; |
507 | if ($self->{fh}) { |
|
|
508 | $self->_start; |
|
|
509 | return unless $self->{fh}; # could be gone by now |
|
|
510 | |
|
|
511 | } elsif ($self->{connect}) { |
|
|
512 | require AnyEvent::Socket; |
|
|
513 | |
|
|
514 | $self->{peername} = $self->{connect}[0] |
|
|
515 | unless exists $self->{peername}; |
|
|
516 | |
|
|
517 | $self->{_skip_drain_rbuf} = 1; |
|
|
518 | |
|
|
519 | { |
|
|
520 | Scalar::Util::weaken (my $self = $self); |
|
|
521 | |
|
|
522 | $self->{_connect} = |
|
|
523 | AnyEvent::Socket::tcp_connect ( |
|
|
524 | $self->{connect}[0], |
|
|
525 | $self->{connect}[1], |
|
|
526 | sub { |
|
|
527 | my ($fh, $host, $port, $retry) = @_; |
|
|
528 | |
|
|
529 | delete $self->{_connect}; # no longer needed |
|
|
530 | |
|
|
531 | if ($fh) { |
|
|
532 | $self->{fh} = $fh; |
|
|
533 | |
|
|
534 | delete $self->{_skip_drain_rbuf}; |
|
|
535 | $self->_start; |
|
|
536 | |
|
|
537 | $self->{on_connect} |
|
|
538 | and $self->{on_connect}($self, $host, $port, sub { |
|
|
539 | delete @$self{qw(fh _tw _rtw _wtw _ww _rw _eof _queue rbuf _wbuf tls _tls_rbuf _tls_wbuf)}; |
|
|
540 | $self->{_skip_drain_rbuf} = 1; |
|
|
541 | &$retry; |
|
|
542 | }); |
|
|
543 | |
|
|
544 | } else { |
|
|
545 | if ($self->{on_connect_error}) { |
|
|
546 | $self->{on_connect_error}($self, "$!"); |
|
|
547 | $self->destroy if $self; |
|
|
548 | } else { |
|
|
549 | $self->_error ($!, 1); |
|
|
550 | } |
|
|
551 | } |
|
|
552 | }, |
|
|
553 | sub { |
|
|
554 | local $self->{fh} = $_[0]; |
|
|
555 | |
|
|
556 | $self->{on_prepare} |
|
|
557 | ? $self->{on_prepare}->($self) |
|
|
558 | : () |
|
|
559 | } |
|
|
560 | ); |
|
|
561 | } |
|
|
562 | |
|
|
563 | } else { |
|
|
564 | Carp::croak "AnyEvent::Handle: either an existing fh or the connect parameter must be specified"; |
|
|
565 | } |
|
|
566 | |
|
|
567 | $self |
|
|
568 | } |
|
|
569 | |
|
|
570 | sub _start { |
|
|
571 | my ($self) = @_; |
|
|
572 | |
|
|
573 | # too many clueless people try to use udp and similar sockets |
|
|
574 | # with AnyEvent::Handle, do them a favour. |
|
|
575 | my $type = getsockopt $self->{fh}, Socket::SOL_SOCKET (), Socket::SO_TYPE (); |
|
|
576 | Carp::croak "AnyEvent::Handle: only stream sockets supported, anything else will NOT work!" |
|
|
577 | if Socket::SOCK_STREAM () != (unpack "I", $type) && defined $type; |
199 | |
578 | |
200 | AnyEvent::Util::fh_nonblocking $self->{fh}, 1; |
579 | AnyEvent::Util::fh_nonblocking $self->{fh}, 1; |
201 | |
580 | |
202 | if ($self->{tls}) { |
581 | $self->{_activity} = |
203 | require Net::SSLeay; |
582 | $self->{_ractivity} = |
|
|
583 | $self->{_wactivity} = AE::now; |
|
|
584 | |
|
|
585 | $self->{read_size} ||= 2048; |
|
|
586 | $self->{max_read_size} = $self->{read_size} |
|
|
587 | if $self->{read_size} > ($self->{max_read_size} || MAX_READ_SIZE); |
|
|
588 | |
|
|
589 | $self->timeout (delete $self->{timeout} ) if $self->{timeout}; |
|
|
590 | $self->rtimeout (delete $self->{rtimeout} ) if $self->{rtimeout}; |
|
|
591 | $self->wtimeout (delete $self->{wtimeout} ) if $self->{wtimeout}; |
|
|
592 | |
|
|
593 | $self->no_delay (delete $self->{no_delay} ) if exists $self->{no_delay} && $self->{no_delay}; |
|
|
594 | $self->keepalive (delete $self->{keepalive}) if exists $self->{keepalive} && $self->{keepalive}; |
|
|
595 | |
|
|
596 | $self->oobinline (exists $self->{oobinline} ? delete $self->{oobinline} : 1); |
|
|
597 | |
204 | $self->starttls (delete $self->{tls}, delete $self->{tls_ctx}); |
598 | $self->starttls (delete $self->{tls}, delete $self->{tls_ctx}) |
205 | } |
599 | if $self->{tls}; |
206 | |
600 | |
207 | $self->on_eof (delete $self->{on_eof} ) if $self->{on_eof}; |
|
|
208 | $self->on_error (delete $self->{on_error}) if $self->{on_error}; |
|
|
209 | $self->on_drain (delete $self->{on_drain}) if $self->{on_drain}; |
601 | $self->on_drain (delete $self->{on_drain} ) if $self->{on_drain}; |
210 | $self->on_read (delete $self->{on_read} ) if $self->{on_read}; |
|
|
211 | |
602 | |
212 | $self->start_read; |
603 | $self->start_read |
|
|
604 | if $self->{on_read} || @{ $self->{_queue} }; |
213 | |
605 | |
214 | $self |
606 | $self->_drain_wbuf; |
215 | } |
607 | } |
216 | |
608 | |
217 | sub _shutdown { |
|
|
218 | my ($self) = @_; |
|
|
219 | |
|
|
220 | delete $self->{_rw}; |
|
|
221 | delete $self->{_ww}; |
|
|
222 | delete $self->{fh}; |
|
|
223 | } |
|
|
224 | |
|
|
225 | sub error { |
609 | sub _error { |
226 | my ($self) = @_; |
610 | my ($self, $errno, $fatal, $message) = @_; |
227 | |
611 | |
228 | { |
612 | $! = $errno; |
229 | local $!; |
613 | $message ||= "$!"; |
230 | $self->_shutdown; |
|
|
231 | } |
|
|
232 | |
614 | |
233 | $self->{on_error}($self) |
|
|
234 | if $self->{on_error}; |
615 | if ($self->{on_error}) { |
235 | |
616 | $self->{on_error}($self, $fatal, $message); |
|
|
617 | $self->destroy if $fatal; |
|
|
618 | } elsif ($self->{fh} || $self->{connect}) { |
|
|
619 | $self->destroy; |
236 | Carp::croak "AnyEvent::Handle uncaught fatal error: $!"; |
620 | Carp::croak "AnyEvent::Handle uncaught error: $message"; |
|
|
621 | } |
237 | } |
622 | } |
238 | |
623 | |
239 | =item $fh = $handle->fh |
624 | =item $fh = $handle->fh |
240 | |
625 | |
241 | This method returns the file handle of the L<AnyEvent::Handle> object. |
626 | This method returns the file handle used to create the L<AnyEvent::Handle> object. |
242 | |
627 | |
243 | =cut |
628 | =cut |
244 | |
629 | |
245 | sub fh { $_[0]{fh} } |
630 | sub fh { $_[0]{fh} } |
246 | |
631 | |
… | |
… | |
262 | |
647 | |
263 | sub on_eof { |
648 | sub on_eof { |
264 | $_[0]{on_eof} = $_[1]; |
649 | $_[0]{on_eof} = $_[1]; |
265 | } |
650 | } |
266 | |
651 | |
|
|
652 | =item $handle->on_timeout ($cb) |
|
|
653 | |
|
|
654 | =item $handle->on_rtimeout ($cb) |
|
|
655 | |
|
|
656 | =item $handle->on_wtimeout ($cb) |
|
|
657 | |
|
|
658 | Replace the current C<on_timeout>, C<on_rtimeout> or C<on_wtimeout> |
|
|
659 | callback, or disables the callback (but not the timeout) if C<$cb> = |
|
|
660 | C<undef>. See the C<timeout> constructor argument and method. |
|
|
661 | |
|
|
662 | =cut |
|
|
663 | |
|
|
664 | # see below |
|
|
665 | |
|
|
666 | =item $handle->autocork ($boolean) |
|
|
667 | |
|
|
668 | Enables or disables the current autocork behaviour (see C<autocork> |
|
|
669 | constructor argument). Changes will only take effect on the next write. |
|
|
670 | |
|
|
671 | =cut |
|
|
672 | |
|
|
673 | sub autocork { |
|
|
674 | $_[0]{autocork} = $_[1]; |
|
|
675 | } |
|
|
676 | |
|
|
677 | =item $handle->no_delay ($boolean) |
|
|
678 | |
|
|
679 | Enables or disables the C<no_delay> setting (see constructor argument of |
|
|
680 | the same name for details). |
|
|
681 | |
|
|
682 | =cut |
|
|
683 | |
|
|
684 | sub no_delay { |
|
|
685 | $_[0]{no_delay} = $_[1]; |
|
|
686 | |
|
|
687 | setsockopt $_[0]{fh}, Socket::IPPROTO_TCP (), Socket::TCP_NODELAY (), int $_[1] |
|
|
688 | if $_[0]{fh}; |
|
|
689 | } |
|
|
690 | |
|
|
691 | =item $handle->keepalive ($boolean) |
|
|
692 | |
|
|
693 | Enables or disables the C<keepalive> setting (see constructor argument of |
|
|
694 | the same name for details). |
|
|
695 | |
|
|
696 | =cut |
|
|
697 | |
|
|
698 | sub keepalive { |
|
|
699 | $_[0]{keepalive} = $_[1]; |
|
|
700 | |
|
|
701 | eval { |
|
|
702 | local $SIG{__DIE__}; |
|
|
703 | setsockopt $_[0]{fh}, Socket::SOL_SOCKET (), Socket::SO_KEEPALIVE (), int $_[1] |
|
|
704 | if $_[0]{fh}; |
|
|
705 | }; |
|
|
706 | } |
|
|
707 | |
|
|
708 | =item $handle->oobinline ($boolean) |
|
|
709 | |
|
|
710 | Enables or disables the C<oobinline> setting (see constructor argument of |
|
|
711 | the same name for details). |
|
|
712 | |
|
|
713 | =cut |
|
|
714 | |
|
|
715 | sub oobinline { |
|
|
716 | $_[0]{oobinline} = $_[1]; |
|
|
717 | |
|
|
718 | eval { |
|
|
719 | local $SIG{__DIE__}; |
|
|
720 | setsockopt $_[0]{fh}, Socket::SOL_SOCKET (), Socket::SO_OOBINLINE (), int $_[1] |
|
|
721 | if $_[0]{fh}; |
|
|
722 | }; |
|
|
723 | } |
|
|
724 | |
|
|
725 | =item $handle->keepalive ($boolean) |
|
|
726 | |
|
|
727 | Enables or disables the C<keepalive> setting (see constructor argument of |
|
|
728 | the same name for details). |
|
|
729 | |
|
|
730 | =cut |
|
|
731 | |
|
|
732 | sub keepalive { |
|
|
733 | $_[0]{keepalive} = $_[1]; |
|
|
734 | |
|
|
735 | eval { |
|
|
736 | local $SIG{__DIE__}; |
|
|
737 | setsockopt $_[0]{fh}, Socket::SOL_SOCKET (), Socket::SO_KEEPALIVE (), int $_[1] |
|
|
738 | if $_[0]{fh}; |
|
|
739 | }; |
|
|
740 | } |
|
|
741 | |
|
|
742 | =item $handle->on_starttls ($cb) |
|
|
743 | |
|
|
744 | Replace the current C<on_starttls> callback (see the C<on_starttls> constructor argument). |
|
|
745 | |
|
|
746 | =cut |
|
|
747 | |
|
|
748 | sub on_starttls { |
|
|
749 | $_[0]{on_starttls} = $_[1]; |
|
|
750 | } |
|
|
751 | |
|
|
752 | =item $handle->on_stoptls ($cb) |
|
|
753 | |
|
|
754 | Replace the current C<on_stoptls> callback (see the C<on_stoptls> constructor argument). |
|
|
755 | |
|
|
756 | =cut |
|
|
757 | |
|
|
758 | sub on_stoptls { |
|
|
759 | $_[0]{on_stoptls} = $_[1]; |
|
|
760 | } |
|
|
761 | |
|
|
762 | =item $handle->rbuf_max ($max_octets) |
|
|
763 | |
|
|
764 | Configures the C<rbuf_max> setting (C<undef> disables it). |
|
|
765 | |
|
|
766 | =item $handle->wbuf_max ($max_octets) |
|
|
767 | |
|
|
768 | Configures the C<wbuf_max> setting (C<undef> disables it). |
|
|
769 | |
|
|
770 | =cut |
|
|
771 | |
|
|
772 | sub rbuf_max { |
|
|
773 | $_[0]{rbuf_max} = $_[1]; |
|
|
774 | } |
|
|
775 | |
|
|
776 | sub wbuf_max { |
|
|
777 | $_[0]{wbuf_max} = $_[1]; |
|
|
778 | } |
|
|
779 | |
|
|
780 | ############################################################################# |
|
|
781 | |
|
|
782 | =item $handle->timeout ($seconds) |
|
|
783 | |
|
|
784 | =item $handle->rtimeout ($seconds) |
|
|
785 | |
|
|
786 | =item $handle->wtimeout ($seconds) |
|
|
787 | |
|
|
788 | Configures (or disables) the inactivity timeout. |
|
|
789 | |
|
|
790 | The timeout will be checked instantly, so this method might destroy the |
|
|
791 | handle before it returns. |
|
|
792 | |
|
|
793 | =item $handle->timeout_reset |
|
|
794 | |
|
|
795 | =item $handle->rtimeout_reset |
|
|
796 | |
|
|
797 | =item $handle->wtimeout_reset |
|
|
798 | |
|
|
799 | Reset the activity timeout, as if data was received or sent. |
|
|
800 | |
|
|
801 | These methods are cheap to call. |
|
|
802 | |
|
|
803 | =cut |
|
|
804 | |
|
|
805 | for my $dir ("", "r", "w") { |
|
|
806 | my $timeout = "${dir}timeout"; |
|
|
807 | my $tw = "_${dir}tw"; |
|
|
808 | my $on_timeout = "on_${dir}timeout"; |
|
|
809 | my $activity = "_${dir}activity"; |
|
|
810 | my $cb; |
|
|
811 | |
|
|
812 | *$on_timeout = sub { |
|
|
813 | $_[0]{$on_timeout} = $_[1]; |
|
|
814 | }; |
|
|
815 | |
|
|
816 | *$timeout = sub { |
|
|
817 | my ($self, $new_value) = @_; |
|
|
818 | |
|
|
819 | $new_value >= 0 |
|
|
820 | or Carp::croak "AnyEvent::Handle->$timeout called with negative timeout ($new_value), caught"; |
|
|
821 | |
|
|
822 | $self->{$timeout} = $new_value; |
|
|
823 | delete $self->{$tw}; &$cb; |
|
|
824 | }; |
|
|
825 | |
|
|
826 | *{"${dir}timeout_reset"} = sub { |
|
|
827 | $_[0]{$activity} = AE::now; |
|
|
828 | }; |
|
|
829 | |
|
|
830 | # main workhorse: |
|
|
831 | # reset the timeout watcher, as neccessary |
|
|
832 | # also check for time-outs |
|
|
833 | $cb = sub { |
|
|
834 | my ($self) = @_; |
|
|
835 | |
|
|
836 | if ($self->{$timeout} && $self->{fh}) { |
|
|
837 | my $NOW = AE::now; |
|
|
838 | |
|
|
839 | # when would the timeout trigger? |
|
|
840 | my $after = $self->{$activity} + $self->{$timeout} - $NOW; |
|
|
841 | |
|
|
842 | # now or in the past already? |
|
|
843 | if ($after <= 0) { |
|
|
844 | $self->{$activity} = $NOW; |
|
|
845 | |
|
|
846 | if ($self->{$on_timeout}) { |
|
|
847 | $self->{$on_timeout}($self); |
|
|
848 | } else { |
|
|
849 | $self->_error (Errno::ETIMEDOUT); |
|
|
850 | } |
|
|
851 | |
|
|
852 | # callback could have changed timeout value, optimise |
|
|
853 | return unless $self->{$timeout}; |
|
|
854 | |
|
|
855 | # calculate new after |
|
|
856 | $after = $self->{$timeout}; |
|
|
857 | } |
|
|
858 | |
|
|
859 | Scalar::Util::weaken $self; |
|
|
860 | return unless $self; # ->error could have destroyed $self |
|
|
861 | |
|
|
862 | $self->{$tw} ||= AE::timer $after, 0, sub { |
|
|
863 | delete $self->{$tw}; |
|
|
864 | $cb->($self); |
|
|
865 | }; |
|
|
866 | } else { |
|
|
867 | delete $self->{$tw}; |
|
|
868 | } |
|
|
869 | } |
|
|
870 | } |
|
|
871 | |
267 | ############################################################################# |
872 | ############################################################################# |
268 | |
873 | |
269 | =back |
874 | =back |
270 | |
875 | |
271 | =head2 WRITE QUEUE |
876 | =head2 WRITE QUEUE |
… | |
… | |
284 | =item $handle->on_drain ($cb) |
889 | =item $handle->on_drain ($cb) |
285 | |
890 | |
286 | Sets the C<on_drain> callback or clears it (see the description of |
891 | Sets the C<on_drain> callback or clears it (see the description of |
287 | C<on_drain> in the constructor). |
892 | C<on_drain> in the constructor). |
288 | |
893 | |
|
|
894 | This method may invoke callbacks (and therefore the handle might be |
|
|
895 | destroyed after it returns). |
|
|
896 | |
289 | =cut |
897 | =cut |
290 | |
898 | |
291 | sub on_drain { |
899 | sub on_drain { |
292 | my ($self, $cb) = @_; |
900 | my ($self, $cb) = @_; |
293 | |
901 | |
294 | $self->{on_drain} = $cb; |
902 | $self->{on_drain} = $cb; |
295 | |
903 | |
296 | $cb->($self) |
904 | $cb->($self) |
297 | if $cb && $self->{low_water_mark} >= length $self->{wbuf}; |
905 | if $cb && $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf}); |
298 | } |
906 | } |
299 | |
907 | |
300 | =item $handle->push_write ($data) |
908 | =item $handle->push_write ($data) |
301 | |
909 | |
302 | Queues the given scalar to be written. You can push as much data as you |
910 | Queues the given scalar to be written. You can push as much data as |
303 | want (only limited by the available memory), as C<AnyEvent::Handle> |
911 | you want (only limited by the available memory and C<wbuf_max>), as |
304 | buffers it independently of the kernel. |
912 | C<AnyEvent::Handle> buffers it independently of the kernel. |
|
|
913 | |
|
|
914 | This method may invoke callbacks (and therefore the handle might be |
|
|
915 | destroyed after it returns). |
305 | |
916 | |
306 | =cut |
917 | =cut |
307 | |
918 | |
308 | sub _drain_wbuf { |
919 | sub _drain_wbuf { |
309 | my ($self) = @_; |
920 | my ($self) = @_; |
… | |
… | |
313 | Scalar::Util::weaken $self; |
924 | Scalar::Util::weaken $self; |
314 | |
925 | |
315 | my $cb = sub { |
926 | my $cb = sub { |
316 | my $len = syswrite $self->{fh}, $self->{wbuf}; |
927 | my $len = syswrite $self->{fh}, $self->{wbuf}; |
317 | |
928 | |
318 | if ($len >= 0) { |
929 | if (defined $len) { |
319 | substr $self->{wbuf}, 0, $len, ""; |
930 | substr $self->{wbuf}, 0, $len, ""; |
320 | |
931 | |
|
|
932 | $self->{_activity} = $self->{_wactivity} = AE::now; |
|
|
933 | |
321 | $self->{on_drain}($self) |
934 | $self->{on_drain}($self) |
322 | if $self->{low_water_mark} >= length $self->{wbuf} |
935 | if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf}) |
323 | && $self->{on_drain}; |
936 | && $self->{on_drain}; |
324 | |
937 | |
325 | delete $self->{_ww} unless length $self->{wbuf}; |
938 | delete $self->{_ww} unless length $self->{wbuf}; |
326 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAWOULDBLOCK) { |
939 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) { |
327 | $self->error; |
940 | $self->_error ($!, 1); |
328 | } |
941 | } |
329 | }; |
942 | }; |
330 | |
943 | |
331 | # try to write data immediately |
944 | # try to write data immediately |
332 | $cb->(); |
945 | $cb->() unless $self->{autocork}; |
333 | |
946 | |
334 | # if still data left in wbuf, we need to poll |
947 | # if still data left in wbuf, we need to poll |
335 | $self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb) |
948 | $self->{_ww} = AE::io $self->{fh}, 1, $cb |
336 | if length $self->{wbuf}; |
949 | if length $self->{wbuf}; |
|
|
950 | |
|
|
951 | if ( |
|
|
952 | defined $self->{wbuf_max} |
|
|
953 | && $self->{wbuf_max} < length $self->{wbuf} |
|
|
954 | ) { |
|
|
955 | $self->_error (Errno::ENOSPC, 1), return; |
|
|
956 | } |
337 | }; |
957 | }; |
338 | } |
958 | } |
339 | |
959 | |
340 | our %WH; |
960 | our %WH; |
341 | |
961 | |
|
|
962 | # deprecated |
342 | sub register_write_type($$) { |
963 | sub register_write_type($$) { |
343 | $WH{$_[0]} = $_[1]; |
964 | $WH{$_[0]} = $_[1]; |
344 | } |
965 | } |
345 | |
966 | |
346 | sub push_write { |
967 | sub push_write { |
347 | my $self = shift; |
968 | my $self = shift; |
348 | |
969 | |
349 | if (@_ > 1) { |
970 | if (@_ > 1) { |
350 | my $type = shift; |
971 | my $type = shift; |
351 | |
972 | |
|
|
973 | @_ = ($WH{$type} ||= _load_func "$type\::anyevent_write_type" |
352 | @_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write") |
974 | or Carp::croak "unsupported/unloadable type '$type' passed to AnyEvent::Handle::push_write") |
353 | ->($self, @_); |
975 | ->($self, @_); |
354 | } |
976 | } |
355 | |
977 | |
|
|
978 | # we downgrade here to avoid hard-to-track-down bugs, |
|
|
979 | # and diagnose the problem earlier and better. |
|
|
980 | |
356 | if ($self->{filter_w}) { |
981 | if ($self->{tls}) { |
357 | $self->{filter_w}->($self, \$_[0]); |
982 | utf8::downgrade $self->{_tls_wbuf} .= $_[0]; |
|
|
983 | &_dotls ($self) if $self->{fh}; |
358 | } else { |
984 | } else { |
359 | $self->{wbuf} .= $_[0]; |
985 | utf8::downgrade $self->{wbuf} .= $_[0]; |
360 | $self->_drain_wbuf; |
986 | $self->_drain_wbuf if $self->{fh}; |
361 | } |
987 | } |
362 | } |
988 | } |
363 | |
989 | |
364 | =item $handle->push_write (type => @args) |
990 | =item $handle->push_write (type => @args) |
365 | |
991 | |
366 | =item $handle->unshift_write (type => @args) |
|
|
367 | |
|
|
368 | Instead of formatting your data yourself, you can also let this module do |
992 | Instead of formatting your data yourself, you can also let this module |
369 | the job by specifying a type and type-specific arguments. |
993 | do the job by specifying a type and type-specific arguments. You |
|
|
994 | can also specify the (fully qualified) name of a package, in which |
|
|
995 | case AnyEvent tries to load the package and then expects to find the |
|
|
996 | C<anyevent_write_type> function inside (see "custom write types", below). |
370 | |
997 | |
371 | Predefined types are (if you have ideas for additional types, feel free to |
998 | Predefined types are (if you have ideas for additional types, feel free to |
372 | drop by and tell us): |
999 | drop by and tell us): |
373 | |
1000 | |
374 | =over 4 |
1001 | =over 4 |
… | |
… | |
376 | =item netstring => $string |
1003 | =item netstring => $string |
377 | |
1004 | |
378 | Formats the given value as netstring |
1005 | Formats the given value as netstring |
379 | (http://cr.yp.to/proto/netstrings.txt, this is not a recommendation to use them). |
1006 | (http://cr.yp.to/proto/netstrings.txt, this is not a recommendation to use them). |
380 | |
1007 | |
381 | =back |
|
|
382 | |
|
|
383 | =cut |
1008 | =cut |
384 | |
1009 | |
385 | register_write_type netstring => sub { |
1010 | register_write_type netstring => sub { |
386 | my ($self, $string) = @_; |
1011 | my ($self, $string) = @_; |
387 | |
1012 | |
388 | sprintf "%d:%s,", (length $string), $string |
1013 | (length $string) . ":$string," |
|
|
1014 | }; |
|
|
1015 | |
|
|
1016 | =item packstring => $format, $data |
|
|
1017 | |
|
|
1018 | An octet string prefixed with an encoded length. The encoding C<$format> |
|
|
1019 | uses the same format as a Perl C<pack> format, but must specify a single |
|
|
1020 | integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an |
|
|
1021 | optional C<!>, C<< < >> or C<< > >> modifier). |
|
|
1022 | |
|
|
1023 | =cut |
|
|
1024 | |
|
|
1025 | register_write_type packstring => sub { |
|
|
1026 | my ($self, $format, $string) = @_; |
|
|
1027 | |
|
|
1028 | pack "$format/a*", $string |
389 | }; |
1029 | }; |
390 | |
1030 | |
391 | =item json => $array_or_hashref |
1031 | =item json => $array_or_hashref |
392 | |
1032 | |
393 | Encodes the given hash or array reference into a JSON object. Unless you |
1033 | Encodes the given hash or array reference into a JSON object. Unless you |
… | |
… | |
396 | |
1036 | |
397 | JSON objects (and arrays) are self-delimiting, so you can write JSON at |
1037 | JSON objects (and arrays) are self-delimiting, so you can write JSON at |
398 | one end of a handle and read them at the other end without using any |
1038 | one end of a handle and read them at the other end without using any |
399 | additional framing. |
1039 | additional framing. |
400 | |
1040 | |
|
|
1041 | The generated JSON text is guaranteed not to contain any newlines: While |
|
|
1042 | this module doesn't need delimiters after or between JSON texts to be |
|
|
1043 | able to read them, many other languages depend on that. |
|
|
1044 | |
|
|
1045 | A simple RPC protocol that interoperates easily with others is to send |
|
|
1046 | JSON arrays (or objects, although arrays are usually the better choice as |
|
|
1047 | they mimic how function argument passing works) and a newline after each |
|
|
1048 | JSON text: |
|
|
1049 | |
|
|
1050 | $handle->push_write (json => ["method", "arg1", "arg2"]); # whatever |
|
|
1051 | $handle->push_write ("\012"); |
|
|
1052 | |
|
|
1053 | An AnyEvent::Handle receiver would simply use the C<json> read type and |
|
|
1054 | rely on the fact that the newline will be skipped as leading whitespace: |
|
|
1055 | |
|
|
1056 | $handle->push_read (json => sub { my $array = $_[1]; ... }); |
|
|
1057 | |
|
|
1058 | Other languages could read single lines terminated by a newline and pass |
|
|
1059 | this line into their JSON decoder of choice. |
|
|
1060 | |
401 | =cut |
1061 | =cut |
|
|
1062 | |
|
|
1063 | sub json_coder() { |
|
|
1064 | eval { require JSON::XS; JSON::XS->new->utf8 } |
|
|
1065 | || do { require JSON; JSON->new->utf8 } |
|
|
1066 | } |
402 | |
1067 | |
403 | register_write_type json => sub { |
1068 | register_write_type json => sub { |
404 | my ($self, $ref) = @_; |
1069 | my ($self, $ref) = @_; |
405 | |
1070 | |
406 | require JSON; |
1071 | my $json = $self->{json} ||= json_coder; |
407 | |
1072 | |
408 | $self->{json} ? $self->{json}->encode ($ref) |
1073 | $json->encode ($ref) |
409 | : JSON::encode_json ($ref) |
|
|
410 | }; |
1074 | }; |
411 | |
1075 | |
412 | =item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args) |
1076 | =item storable => $reference |
413 | |
1077 | |
414 | This function (not method) lets you add your own types to C<push_write>. |
1078 | Freezes the given reference using L<Storable> and writes it to the |
|
|
1079 | handle. Uses the C<nfreeze> format. |
|
|
1080 | |
|
|
1081 | =cut |
|
|
1082 | |
|
|
1083 | register_write_type storable => sub { |
|
|
1084 | my ($self, $ref) = @_; |
|
|
1085 | |
|
|
1086 | require Storable unless $Storable::VERSION; |
|
|
1087 | |
|
|
1088 | pack "w/a*", Storable::nfreeze ($ref) |
|
|
1089 | }; |
|
|
1090 | |
|
|
1091 | =back |
|
|
1092 | |
|
|
1093 | =item $handle->push_shutdown |
|
|
1094 | |
|
|
1095 | Sometimes you know you want to close the socket after writing your data |
|
|
1096 | before it was actually written. One way to do that is to replace your |
|
|
1097 | C<on_drain> handler by a callback that shuts down the socket (and set |
|
|
1098 | C<low_water_mark> to C<0>). This method is a shorthand for just that, and |
|
|
1099 | replaces the C<on_drain> callback with: |
|
|
1100 | |
|
|
1101 | sub { shutdown $_[0]{fh}, 1 } |
|
|
1102 | |
|
|
1103 | This simply shuts down the write side and signals an EOF condition to the |
|
|
1104 | the peer. |
|
|
1105 | |
|
|
1106 | You can rely on the normal read queue and C<on_eof> handling |
|
|
1107 | afterwards. This is the cleanest way to close a connection. |
|
|
1108 | |
|
|
1109 | This method may invoke callbacks (and therefore the handle might be |
|
|
1110 | destroyed after it returns). |
|
|
1111 | |
|
|
1112 | =cut |
|
|
1113 | |
|
|
1114 | sub push_shutdown { |
|
|
1115 | my ($self) = @_; |
|
|
1116 | |
|
|
1117 | delete $self->{low_water_mark}; |
|
|
1118 | $self->on_drain (sub { shutdown $_[0]{fh}, 1 }); |
|
|
1119 | } |
|
|
1120 | |
|
|
1121 | =item custom write types - Package::anyevent_write_type $handle, @args |
|
|
1122 | |
|
|
1123 | Instead of one of the predefined types, you can also specify the name of |
|
|
1124 | a package. AnyEvent will try to load the package and then expects to find |
|
|
1125 | a function named C<anyevent_write_type> inside. If it isn't found, it |
|
|
1126 | progressively tries to load the parent package until it either finds the |
|
|
1127 | function (good) or runs out of packages (bad). |
|
|
1128 | |
415 | Whenever the given C<type> is used, C<push_write> will invoke the code |
1129 | Whenever the given C<type> is used, C<push_write> will the function with |
416 | reference with the handle object and the remaining arguments. |
1130 | the handle object and the remaining arguments. |
417 | |
1131 | |
418 | The code reference is supposed to return a single octet string that will |
1132 | The function is supposed to return a single octet string that will be |
419 | be appended to the write buffer. |
1133 | appended to the write buffer, so you can mentally treat this function as a |
|
|
1134 | "arguments to on-the-wire-format" converter. |
420 | |
1135 | |
421 | Note that this is a function, and all types registered this way will be |
1136 | Example: implement a custom write type C<join> that joins the remaining |
422 | global, so try to use unique names. |
1137 | arguments using the first one. |
|
|
1138 | |
|
|
1139 | $handle->push_write (My::Type => " ", 1,2,3); |
|
|
1140 | |
|
|
1141 | # uses the following package, which can be defined in the "My::Type" or in |
|
|
1142 | # the "My" modules to be auto-loaded, or just about anywhere when the |
|
|
1143 | # My::Type::anyevent_write_type is defined before invoking it. |
|
|
1144 | |
|
|
1145 | package My::Type; |
|
|
1146 | |
|
|
1147 | sub anyevent_write_type { |
|
|
1148 | my ($handle, $delim, @args) = @_; |
|
|
1149 | |
|
|
1150 | join $delim, @args |
|
|
1151 | } |
423 | |
1152 | |
424 | =cut |
1153 | =cut |
425 | |
1154 | |
426 | ############################################################################# |
1155 | ############################################################################# |
427 | |
1156 | |
… | |
… | |
436 | ways, the "simple" way, using only C<on_read> and the "complex" way, using |
1165 | ways, the "simple" way, using only C<on_read> and the "complex" way, using |
437 | a queue. |
1166 | a queue. |
438 | |
1167 | |
439 | In the simple case, you just install an C<on_read> callback and whenever |
1168 | In the simple case, you just install an C<on_read> callback and whenever |
440 | new data arrives, it will be called. You can then remove some data (if |
1169 | new data arrives, it will be called. You can then remove some data (if |
441 | enough is there) from the read buffer (C<< $handle->rbuf >>) if you want |
1170 | enough is there) from the read buffer (C<< $handle->rbuf >>). Or you can |
442 | or not. |
1171 | leave the data there if you want to accumulate more (e.g. when only a |
|
|
1172 | partial message has been received so far), or change the read queue with |
|
|
1173 | e.g. C<push_read>. |
443 | |
1174 | |
444 | In the more complex case, you want to queue multiple callbacks. In this |
1175 | In the more complex case, you want to queue multiple callbacks. In this |
445 | case, AnyEvent::Handle will call the first queued callback each time new |
1176 | case, AnyEvent::Handle will call the first queued callback each time new |
446 | data arrives and removes it when it has done its job (see C<push_read>, |
1177 | data arrives (also the first time it is queued) and remove it when it has |
447 | below). |
1178 | done its job (see C<push_read>, below). |
448 | |
1179 | |
449 | This way you can, for example, push three line-reads, followed by reading |
1180 | This way you can, for example, push three line-reads, followed by reading |
450 | a chunk of data, and AnyEvent::Handle will execute them in order. |
1181 | a chunk of data, and AnyEvent::Handle will execute them in order. |
451 | |
1182 | |
452 | Example 1: EPP protocol parser. EPP sends 4 byte length info, followed by |
1183 | Example 1: EPP protocol parser. EPP sends 4 byte length info, followed by |
453 | the specified number of bytes which give an XML datagram. |
1184 | the specified number of bytes which give an XML datagram. |
454 | |
1185 | |
455 | # in the default state, expect some header bytes |
1186 | # in the default state, expect some header bytes |
456 | $handle->on_read (sub { |
1187 | $handle->on_read (sub { |
457 | # some data is here, now queue the length-header-read (4 octets) |
1188 | # some data is here, now queue the length-header-read (4 octets) |
458 | shift->unshift_read_chunk (4, sub { |
1189 | shift->unshift_read (chunk => 4, sub { |
459 | # header arrived, decode |
1190 | # header arrived, decode |
460 | my $len = unpack "N", $_[1]; |
1191 | my $len = unpack "N", $_[1]; |
461 | |
1192 | |
462 | # now read the payload |
1193 | # now read the payload |
463 | shift->unshift_read_chunk ($len, sub { |
1194 | shift->unshift_read (chunk => $len, sub { |
464 | my $xml = $_[1]; |
1195 | my $xml = $_[1]; |
465 | # handle xml |
1196 | # handle xml |
466 | }); |
1197 | }); |
467 | }); |
1198 | }); |
468 | }); |
1199 | }); |
469 | |
1200 | |
470 | Example 2: Implement a client for a protocol that replies either with |
1201 | Example 2: Implement a client for a protocol that replies either with "OK" |
471 | "OK" and another line or "ERROR" for one request, and 64 bytes for the |
1202 | and another line or "ERROR" for the first request that is sent, and 64 |
472 | second request. Due tot he availability of a full queue, we can just |
1203 | bytes for the second request. Due to the availability of a queue, we can |
473 | pipeline sending both requests and manipulate the queue as necessary in |
1204 | just pipeline sending both requests and manipulate the queue as necessary |
474 | the callbacks: |
1205 | in the callbacks. |
475 | |
1206 | |
476 | # request one |
1207 | When the first callback is called and sees an "OK" response, it will |
|
|
1208 | C<unshift> another line-read. This line-read will be queued I<before> the |
|
|
1209 | 64-byte chunk callback. |
|
|
1210 | |
|
|
1211 | # request one, returns either "OK + extra line" or "ERROR" |
477 | $handle->push_write ("request 1\015\012"); |
1212 | $handle->push_write ("request 1\015\012"); |
478 | |
1213 | |
479 | # we expect "ERROR" or "OK" as response, so push a line read |
1214 | # we expect "ERROR" or "OK" as response, so push a line read |
480 | $handle->push_read_line (sub { |
1215 | $handle->push_read (line => sub { |
481 | # if we got an "OK", we have to _prepend_ another line, |
1216 | # if we got an "OK", we have to _prepend_ another line, |
482 | # so it will be read before the second request reads its 64 bytes |
1217 | # so it will be read before the second request reads its 64 bytes |
483 | # which are already in the queue when this callback is called |
1218 | # which are already in the queue when this callback is called |
484 | # we don't do this in case we got an error |
1219 | # we don't do this in case we got an error |
485 | if ($_[1] eq "OK") { |
1220 | if ($_[1] eq "OK") { |
486 | $_[0]->unshift_read_line (sub { |
1221 | $_[0]->unshift_read (line => sub { |
487 | my $response = $_[1]; |
1222 | my $response = $_[1]; |
488 | ... |
1223 | ... |
489 | }); |
1224 | }); |
490 | } |
1225 | } |
491 | }); |
1226 | }); |
492 | |
1227 | |
493 | # request two |
1228 | # request two, simply returns 64 octets |
494 | $handle->push_write ("request 2\015\012"); |
1229 | $handle->push_write ("request 2\015\012"); |
495 | |
1230 | |
496 | # simply read 64 bytes, always |
1231 | # simply read 64 bytes, always |
497 | $handle->push_read_chunk (64, sub { |
1232 | $handle->push_read (chunk => 64, sub { |
498 | my $response = $_[1]; |
1233 | my $response = $_[1]; |
499 | ... |
1234 | ... |
500 | }); |
1235 | }); |
501 | |
1236 | |
502 | =over 4 |
1237 | =over 4 |
503 | |
1238 | |
504 | =cut |
1239 | =cut |
505 | |
1240 | |
506 | sub _drain_rbuf { |
1241 | sub _drain_rbuf { |
507 | my ($self) = @_; |
1242 | my ($self) = @_; |
|
|
1243 | |
|
|
1244 | # avoid recursion |
|
|
1245 | return if $self->{_skip_drain_rbuf}; |
|
|
1246 | local $self->{_skip_drain_rbuf} = 1; |
|
|
1247 | |
|
|
1248 | while () { |
|
|
1249 | # we need to use a separate tls read buffer, as we must not receive data while |
|
|
1250 | # we are draining the buffer, and this can only happen with TLS. |
|
|
1251 | $self->{rbuf} .= delete $self->{_tls_rbuf} |
|
|
1252 | if exists $self->{_tls_rbuf}; |
|
|
1253 | |
|
|
1254 | my $len = length $self->{rbuf}; |
|
|
1255 | |
|
|
1256 | if (my $cb = shift @{ $self->{_queue} }) { |
|
|
1257 | unless ($cb->($self)) { |
|
|
1258 | # no progress can be made |
|
|
1259 | # (not enough data and no data forthcoming) |
|
|
1260 | $self->_error (Errno::EPIPE, 1), return |
|
|
1261 | if $self->{_eof}; |
|
|
1262 | |
|
|
1263 | unshift @{ $self->{_queue} }, $cb; |
|
|
1264 | last; |
|
|
1265 | } |
|
|
1266 | } elsif ($self->{on_read}) { |
|
|
1267 | last unless $len; |
|
|
1268 | |
|
|
1269 | $self->{on_read}($self); |
|
|
1270 | |
|
|
1271 | if ( |
|
|
1272 | $len == length $self->{rbuf} # if no data has been consumed |
|
|
1273 | && !@{ $self->{_queue} } # and the queue is still empty |
|
|
1274 | && $self->{on_read} # but we still have on_read |
|
|
1275 | ) { |
|
|
1276 | # no further data will arrive |
|
|
1277 | # so no progress can be made |
|
|
1278 | $self->_error (Errno::EPIPE, 1), return |
|
|
1279 | if $self->{_eof}; |
|
|
1280 | |
|
|
1281 | last; # more data might arrive |
|
|
1282 | } |
|
|
1283 | } else { |
|
|
1284 | # read side becomes idle |
|
|
1285 | delete $self->{_rw} unless $self->{tls}; |
|
|
1286 | last; |
|
|
1287 | } |
|
|
1288 | } |
|
|
1289 | |
|
|
1290 | if ($self->{_eof}) { |
|
|
1291 | $self->{on_eof} |
|
|
1292 | ? $self->{on_eof}($self) |
|
|
1293 | : $self->_error (0, 1, "Unexpected end-of-file"); |
|
|
1294 | |
|
|
1295 | return; |
|
|
1296 | } |
508 | |
1297 | |
509 | if ( |
1298 | if ( |
510 | defined $self->{rbuf_max} |
1299 | defined $self->{rbuf_max} |
511 | && $self->{rbuf_max} < length $self->{rbuf} |
1300 | && $self->{rbuf_max} < length $self->{rbuf} |
512 | ) { |
1301 | ) { |
513 | $! = &Errno::ENOSPC; |
1302 | $self->_error (Errno::ENOSPC, 1), return; |
514 | $self->error; |
|
|
515 | } |
1303 | } |
516 | |
1304 | |
517 | return if $self->{in_drain}; |
1305 | # may need to restart read watcher |
518 | local $self->{in_drain} = 1; |
1306 | unless ($self->{_rw}) { |
519 | |
1307 | $self->start_read |
520 | while (my $len = length $self->{rbuf}) { |
1308 | if $self->{on_read} || @{ $self->{_queue} }; |
521 | no strict 'refs'; |
|
|
522 | if (my $cb = shift @{ $self->{_queue} }) { |
|
|
523 | unless ($cb->($self)) { |
|
|
524 | if ($self->{_eof}) { |
|
|
525 | # no progress can be made (not enough data and no data forthcoming) |
|
|
526 | $! = &Errno::EPIPE; |
|
|
527 | $self->error; |
|
|
528 | } |
|
|
529 | |
|
|
530 | unshift @{ $self->{_queue} }, $cb; |
|
|
531 | return; |
|
|
532 | } |
|
|
533 | } elsif ($self->{on_read}) { |
|
|
534 | $self->{on_read}($self); |
|
|
535 | |
|
|
536 | if ( |
|
|
537 | $self->{_eof} # if no further data will arrive |
|
|
538 | && $len == length $self->{rbuf} # and no data has been consumed |
|
|
539 | && !@{ $self->{_queue} } # and the queue is still empty |
|
|
540 | && $self->{on_read} # and we still want to read data |
|
|
541 | ) { |
|
|
542 | # then no progress can be made |
|
|
543 | $! = &Errno::EPIPE; |
|
|
544 | $self->error; |
|
|
545 | } |
|
|
546 | } else { |
|
|
547 | # read side becomes idle |
|
|
548 | delete $self->{_rw}; |
|
|
549 | return; |
|
|
550 | } |
|
|
551 | } |
|
|
552 | |
|
|
553 | if ($self->{_eof}) { |
|
|
554 | $self->_shutdown; |
|
|
555 | $self->{on_eof}($self) |
|
|
556 | if $self->{on_eof}; |
|
|
557 | } |
1309 | } |
558 | } |
1310 | } |
559 | |
1311 | |
560 | =item $handle->on_read ($cb) |
1312 | =item $handle->on_read ($cb) |
561 | |
1313 | |
562 | This replaces the currently set C<on_read> callback, or clears it (when |
1314 | This replaces the currently set C<on_read> callback, or clears it (when |
563 | the new callback is C<undef>). See the description of C<on_read> in the |
1315 | the new callback is C<undef>). See the description of C<on_read> in the |
564 | constructor. |
1316 | constructor. |
565 | |
1317 | |
|
|
1318 | This method may invoke callbacks (and therefore the handle might be |
|
|
1319 | destroyed after it returns). |
|
|
1320 | |
566 | =cut |
1321 | =cut |
567 | |
1322 | |
568 | sub on_read { |
1323 | sub on_read { |
569 | my ($self, $cb) = @_; |
1324 | my ($self, $cb) = @_; |
570 | |
1325 | |
571 | $self->{on_read} = $cb; |
1326 | $self->{on_read} = $cb; |
|
|
1327 | $self->_drain_rbuf if $cb; |
572 | } |
1328 | } |
573 | |
1329 | |
574 | =item $handle->rbuf |
1330 | =item $handle->rbuf |
575 | |
1331 | |
576 | Returns the read buffer (as a modifiable lvalue). |
1332 | Returns the read buffer (as a modifiable lvalue). You can also access the |
|
|
1333 | read buffer directly as the C<< ->{rbuf} >> member, if you want (this is |
|
|
1334 | much faster, and no less clean). |
577 | |
1335 | |
578 | You can access the read buffer directly as the C<< ->{rbuf} >> member, if |
1336 | The only operation allowed on the read buffer (apart from looking at it) |
579 | you want. |
1337 | is removing data from its beginning. Otherwise modifying or appending to |
|
|
1338 | it is not allowed and will lead to hard-to-track-down bugs. |
580 | |
1339 | |
581 | NOTE: The read buffer should only be used or modified if the C<on_read>, |
1340 | NOTE: The read buffer should only be used or modified in the C<on_read> |
582 | C<push_read> or C<unshift_read> methods are used. The other read methods |
1341 | callback or when C<push_read> or C<unshift_read> are used with a single |
583 | automatically manage the read buffer. |
1342 | callback (i.e. untyped). Typed C<push_read> and C<unshift_read> methods |
|
|
1343 | will manage the read buffer on their own. |
584 | |
1344 | |
585 | =cut |
1345 | =cut |
586 | |
1346 | |
587 | sub rbuf : lvalue { |
1347 | sub rbuf : lvalue { |
588 | $_[0]{rbuf} |
1348 | $_[0]{rbuf} |
… | |
… | |
605 | |
1365 | |
606 | If enough data was available, then the callback must remove all data it is |
1366 | If enough data was available, then the callback must remove all data it is |
607 | interested in (which can be none at all) and return a true value. After returning |
1367 | interested in (which can be none at all) and return a true value. After returning |
608 | true, it will be removed from the queue. |
1368 | true, it will be removed from the queue. |
609 | |
1369 | |
|
|
1370 | These methods may invoke callbacks (and therefore the handle might be |
|
|
1371 | destroyed after it returns). |
|
|
1372 | |
610 | =cut |
1373 | =cut |
611 | |
1374 | |
612 | our %RH; |
1375 | our %RH; |
613 | |
1376 | |
614 | sub register_read_type($$) { |
1377 | sub register_read_type($$) { |
… | |
… | |
620 | my $cb = pop; |
1383 | my $cb = pop; |
621 | |
1384 | |
622 | if (@_) { |
1385 | if (@_) { |
623 | my $type = shift; |
1386 | my $type = shift; |
624 | |
1387 | |
|
|
1388 | $cb = ($RH{$type} ||= _load_func "$type\::anyevent_read_type" |
625 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read") |
1389 | or Carp::croak "unsupported/unloadable type '$type' passed to AnyEvent::Handle::push_read") |
626 | ->($self, $cb, @_); |
1390 | ->($self, $cb, @_); |
627 | } |
1391 | } |
628 | |
1392 | |
629 | push @{ $self->{_queue} }, $cb; |
1393 | push @{ $self->{_queue} }, $cb; |
630 | $self->_drain_rbuf; |
1394 | $self->_drain_rbuf; |
… | |
… | |
635 | my $cb = pop; |
1399 | my $cb = pop; |
636 | |
1400 | |
637 | if (@_) { |
1401 | if (@_) { |
638 | my $type = shift; |
1402 | my $type = shift; |
639 | |
1403 | |
|
|
1404 | $cb = ($RH{$type} ||= _load_func "$type\::anyevent_read_type" |
640 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read") |
1405 | or Carp::croak "unsupported/unloadable type '$type' passed to AnyEvent::Handle::unshift_read") |
641 | ->($self, $cb, @_); |
1406 | ->($self, $cb, @_); |
642 | } |
1407 | } |
643 | |
|
|
644 | |
1408 | |
645 | unshift @{ $self->{_queue} }, $cb; |
1409 | unshift @{ $self->{_queue} }, $cb; |
646 | $self->_drain_rbuf; |
1410 | $self->_drain_rbuf; |
647 | } |
1411 | } |
648 | |
1412 | |
… | |
… | |
650 | |
1414 | |
651 | =item $handle->unshift_read (type => @args, $cb) |
1415 | =item $handle->unshift_read (type => @args, $cb) |
652 | |
1416 | |
653 | Instead of providing a callback that parses the data itself you can chose |
1417 | Instead of providing a callback that parses the data itself you can chose |
654 | between a number of predefined parsing formats, for chunks of data, lines |
1418 | between a number of predefined parsing formats, for chunks of data, lines |
655 | etc. |
1419 | etc. You can also specify the (fully qualified) name of a package, in |
|
|
1420 | which case AnyEvent tries to load the package and then expects to find the |
|
|
1421 | C<anyevent_read_type> function inside (see "custom read types", below). |
656 | |
1422 | |
657 | Predefined types are (if you have ideas for additional types, feel free to |
1423 | Predefined types are (if you have ideas for additional types, feel free to |
658 | drop by and tell us): |
1424 | drop by and tell us): |
659 | |
1425 | |
660 | =over 4 |
1426 | =over 4 |
… | |
… | |
666 | data. |
1432 | data. |
667 | |
1433 | |
668 | Example: read 2 bytes. |
1434 | Example: read 2 bytes. |
669 | |
1435 | |
670 | $handle->push_read (chunk => 2, sub { |
1436 | $handle->push_read (chunk => 2, sub { |
671 | warn "yay ", unpack "H*", $_[1]; |
1437 | say "yay " . unpack "H*", $_[1]; |
672 | }); |
1438 | }); |
673 | |
1439 | |
674 | =cut |
1440 | =cut |
675 | |
1441 | |
676 | register_read_type chunk => sub { |
1442 | register_read_type chunk => sub { |
… | |
… | |
681 | $cb->($_[0], substr $_[0]{rbuf}, 0, $len, ""); |
1447 | $cb->($_[0], substr $_[0]{rbuf}, 0, $len, ""); |
682 | 1 |
1448 | 1 |
683 | } |
1449 | } |
684 | }; |
1450 | }; |
685 | |
1451 | |
686 | # compatibility with older API |
|
|
687 | sub push_read_chunk { |
|
|
688 | $_[0]->push_read (chunk => $_[1], $_[2]); |
|
|
689 | } |
|
|
690 | |
|
|
691 | sub unshift_read_chunk { |
|
|
692 | $_[0]->unshift_read (chunk => $_[1], $_[2]); |
|
|
693 | } |
|
|
694 | |
|
|
695 | =item line => [$eol, ]$cb->($handle, $line, $eol) |
1452 | =item line => [$eol, ]$cb->($handle, $line, $eol) |
696 | |
1453 | |
697 | The callback will be called only once a full line (including the end of |
1454 | The callback will be called only once a full line (including the end of |
698 | line marker, C<$eol>) has been read. This line (excluding the end of line |
1455 | line marker, C<$eol>) has been read. This line (excluding the end of line |
699 | marker) will be passed to the callback as second argument (C<$line>), and |
1456 | marker) will be passed to the callback as second argument (C<$line>), and |
… | |
… | |
714 | =cut |
1471 | =cut |
715 | |
1472 | |
716 | register_read_type line => sub { |
1473 | register_read_type line => sub { |
717 | my ($self, $cb, $eol) = @_; |
1474 | my ($self, $cb, $eol) = @_; |
718 | |
1475 | |
719 | $eol = qr|(\015?\012)| if @_ < 3; |
1476 | if (@_ < 3) { |
720 | $eol = quotemeta $eol unless ref $eol; |
1477 | # this is more than twice as fast as the generic code below |
721 | $eol = qr|^(.*?)($eol)|s; |
|
|
722 | |
|
|
723 | sub { |
1478 | sub { |
724 | $_[0]{rbuf} =~ s/$eol// or return; |
1479 | $_[0]{rbuf} =~ s/^([^\015\012]*)(\015?\012)// or return; |
725 | |
1480 | |
726 | $cb->($_[0], $1, $2); |
1481 | $cb->($_[0], $1, $2); |
727 | 1 |
|
|
728 | } |
|
|
729 | }; |
|
|
730 | |
|
|
731 | # compatibility with older API |
|
|
732 | sub push_read_line { |
|
|
733 | my $self = shift; |
|
|
734 | $self->push_read (line => @_); |
|
|
735 | } |
|
|
736 | |
|
|
737 | sub unshift_read_line { |
|
|
738 | my $self = shift; |
|
|
739 | $self->unshift_read (line => @_); |
|
|
740 | } |
|
|
741 | |
|
|
742 | =item netstring => $cb->($handle, $string) |
|
|
743 | |
|
|
744 | A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement). |
|
|
745 | |
|
|
746 | Throws an error with C<$!> set to EBADMSG on format violations. |
|
|
747 | |
|
|
748 | =cut |
|
|
749 | |
|
|
750 | register_read_type netstring => sub { |
|
|
751 | my ($self, $cb) = @_; |
|
|
752 | |
|
|
753 | sub { |
|
|
754 | unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) { |
|
|
755 | if ($_[0]{rbuf} =~ /[^0-9]/) { |
|
|
756 | $! = &Errno::EBADMSG; |
|
|
757 | $self->error; |
|
|
758 | } |
1482 | 1 |
759 | return; |
|
|
760 | } |
1483 | } |
|
|
1484 | } else { |
|
|
1485 | $eol = quotemeta $eol unless ref $eol; |
|
|
1486 | $eol = qr|^(.*?)($eol)|s; |
761 | |
1487 | |
762 | my $len = $1; |
1488 | sub { |
|
|
1489 | $_[0]{rbuf} =~ s/$eol// or return; |
763 | |
1490 | |
764 | $self->unshift_read (chunk => $len, sub { |
1491 | $cb->($_[0], $1, $2); |
765 | my $string = $_[1]; |
|
|
766 | $_[0]->unshift_read (chunk => 1, sub { |
|
|
767 | if ($_[1] eq ",") { |
|
|
768 | $cb->($_[0], $string); |
|
|
769 | } else { |
|
|
770 | $! = &Errno::EBADMSG; |
|
|
771 | $self->error; |
|
|
772 | } |
|
|
773 | }); |
1492 | 1 |
774 | }); |
1493 | } |
775 | |
|
|
776 | 1 |
|
|
777 | } |
1494 | } |
778 | }; |
1495 | }; |
779 | |
1496 | |
780 | =item regex => $accept[, $reject[, $skip], $cb->($handle, $data) |
1497 | =item regex => $accept[, $reject[, $skip], $cb->($handle, $data) |
781 | |
1498 | |
… | |
… | |
801 | the receive buffer when neither C<$accept> nor C<$reject> match, |
1518 | the receive buffer when neither C<$accept> nor C<$reject> match, |
802 | and everything preceding and including the match will be accepted |
1519 | and everything preceding and including the match will be accepted |
803 | unconditionally. This is useful to skip large amounts of data that you |
1520 | unconditionally. This is useful to skip large amounts of data that you |
804 | know cannot be matched, so that the C<$accept> or C<$reject> regex do not |
1521 | know cannot be matched, so that the C<$accept> or C<$reject> regex do not |
805 | have to start matching from the beginning. This is purely an optimisation |
1522 | have to start matching from the beginning. This is purely an optimisation |
806 | and is usually worth only when you expect more than a few kilobytes. |
1523 | and is usually worth it only when you expect more than a few kilobytes. |
807 | |
1524 | |
808 | Example: expect a http header, which ends at C<\015\012\015\012>. Since we |
1525 | Example: expect a http header, which ends at C<\015\012\015\012>. Since we |
809 | expect the header to be very large (it isn't in practise, but...), we use |
1526 | expect the header to be very large (it isn't in practice, but...), we use |
810 | a skip regex to skip initial portions. The skip regex is tricky in that |
1527 | a skip regex to skip initial portions. The skip regex is tricky in that |
811 | it only accepts something not ending in either \015 or \012, as these are |
1528 | it only accepts something not ending in either \015 or \012, as these are |
812 | required for the accept regex. |
1529 | required for the accept regex. |
813 | |
1530 | |
814 | $handle->push_read (regex => |
1531 | $handle->push_read (regex => |
… | |
… | |
827 | |
1544 | |
828 | sub { |
1545 | sub { |
829 | # accept |
1546 | # accept |
830 | if ($$rbuf =~ $accept) { |
1547 | if ($$rbuf =~ $accept) { |
831 | $data .= substr $$rbuf, 0, $+[0], ""; |
1548 | $data .= substr $$rbuf, 0, $+[0], ""; |
832 | $cb->($self, $data); |
1549 | $cb->($_[0], $data); |
833 | return 1; |
1550 | return 1; |
834 | } |
1551 | } |
835 | |
1552 | |
836 | # reject |
1553 | # reject |
837 | if ($reject && $$rbuf =~ $reject) { |
1554 | if ($reject && $$rbuf =~ $reject) { |
838 | $! = &Errno::EBADMSG; |
1555 | $_[0]->_error (Errno::EBADMSG); |
839 | $self->error; |
|
|
840 | } |
1556 | } |
841 | |
1557 | |
842 | # skip |
1558 | # skip |
843 | if ($skip && $$rbuf =~ $skip) { |
1559 | if ($skip && $$rbuf =~ $skip) { |
844 | $data .= substr $$rbuf, 0, $+[0], ""; |
1560 | $data .= substr $$rbuf, 0, $+[0], ""; |
… | |
… | |
846 | |
1562 | |
847 | () |
1563 | () |
848 | } |
1564 | } |
849 | }; |
1565 | }; |
850 | |
1566 | |
|
|
1567 | =item netstring => $cb->($handle, $string) |
|
|
1568 | |
|
|
1569 | A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement). |
|
|
1570 | |
|
|
1571 | Throws an error with C<$!> set to EBADMSG on format violations. |
|
|
1572 | |
|
|
1573 | =cut |
|
|
1574 | |
|
|
1575 | register_read_type netstring => sub { |
|
|
1576 | my ($self, $cb) = @_; |
|
|
1577 | |
|
|
1578 | sub { |
|
|
1579 | unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) { |
|
|
1580 | if ($_[0]{rbuf} =~ /[^0-9]/) { |
|
|
1581 | $_[0]->_error (Errno::EBADMSG); |
|
|
1582 | } |
|
|
1583 | return; |
|
|
1584 | } |
|
|
1585 | |
|
|
1586 | my $len = $1; |
|
|
1587 | |
|
|
1588 | $_[0]->unshift_read (chunk => $len, sub { |
|
|
1589 | my $string = $_[1]; |
|
|
1590 | $_[0]->unshift_read (chunk => 1, sub { |
|
|
1591 | if ($_[1] eq ",") { |
|
|
1592 | $cb->($_[0], $string); |
|
|
1593 | } else { |
|
|
1594 | $_[0]->_error (Errno::EBADMSG); |
|
|
1595 | } |
|
|
1596 | }); |
|
|
1597 | }); |
|
|
1598 | |
|
|
1599 | 1 |
|
|
1600 | } |
|
|
1601 | }; |
|
|
1602 | |
|
|
1603 | =item packstring => $format, $cb->($handle, $string) |
|
|
1604 | |
|
|
1605 | An octet string prefixed with an encoded length. The encoding C<$format> |
|
|
1606 | uses the same format as a Perl C<pack> format, but must specify a single |
|
|
1607 | integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an |
|
|
1608 | optional C<!>, C<< < >> or C<< > >> modifier). |
|
|
1609 | |
|
|
1610 | For example, DNS over TCP uses a prefix of C<n> (2 octet network order), |
|
|
1611 | EPP uses a prefix of C<N> (4 octtes). |
|
|
1612 | |
|
|
1613 | Example: read a block of data prefixed by its length in BER-encoded |
|
|
1614 | format (very efficient). |
|
|
1615 | |
|
|
1616 | $handle->push_read (packstring => "w", sub { |
|
|
1617 | my ($handle, $data) = @_; |
|
|
1618 | }); |
|
|
1619 | |
|
|
1620 | =cut |
|
|
1621 | |
|
|
1622 | register_read_type packstring => sub { |
|
|
1623 | my ($self, $cb, $format) = @_; |
|
|
1624 | |
|
|
1625 | sub { |
|
|
1626 | # when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method |
|
|
1627 | defined (my $len = eval { unpack $format, $_[0]{rbuf} }) |
|
|
1628 | or return; |
|
|
1629 | |
|
|
1630 | $format = length pack $format, $len; |
|
|
1631 | |
|
|
1632 | # bypass unshift if we already have the remaining chunk |
|
|
1633 | if ($format + $len <= length $_[0]{rbuf}) { |
|
|
1634 | my $data = substr $_[0]{rbuf}, $format, $len; |
|
|
1635 | substr $_[0]{rbuf}, 0, $format + $len, ""; |
|
|
1636 | $cb->($_[0], $data); |
|
|
1637 | } else { |
|
|
1638 | # remove prefix |
|
|
1639 | substr $_[0]{rbuf}, 0, $format, ""; |
|
|
1640 | |
|
|
1641 | # read remaining chunk |
|
|
1642 | $_[0]->unshift_read (chunk => $len, $cb); |
|
|
1643 | } |
|
|
1644 | |
|
|
1645 | 1 |
|
|
1646 | } |
|
|
1647 | }; |
|
|
1648 | |
851 | =item json => $cb->($handle, $hash_or_arrayref) |
1649 | =item json => $cb->($handle, $hash_or_arrayref) |
852 | |
1650 | |
853 | Reads a JSON object or array, decodes it and passes it to the callback. |
1651 | Reads a JSON object or array, decodes it and passes it to the |
|
|
1652 | callback. When a parse error occurs, an C<EBADMSG> error will be raised. |
854 | |
1653 | |
855 | If a C<json> object was passed to the constructor, then that will be used |
1654 | If a C<json> object was passed to the constructor, then that will be used |
856 | for the final decode, otherwise it will create a JSON coder expecting UTF-8. |
1655 | for the final decode, otherwise it will create a JSON coder expecting UTF-8. |
857 | |
1656 | |
858 | This read type uses the incremental parser available with JSON version |
1657 | This read type uses the incremental parser available with JSON version |
859 | 2.09 (and JSON::XS version 2.2) and above. You have to provide a |
1658 | 2.09 (and JSON::XS version 2.2) and above. You have to provide a |
860 | dependency on your own: this module will load the JSON module, but |
1659 | dependency on your own: this module will load the JSON module, but |
861 | AnyEvent does not depend on it itself. |
1660 | AnyEvent does not depend on it itself. |
862 | |
1661 | |
863 | Since JSON texts are fully self-delimiting, the C<json> read and write |
1662 | Since JSON texts are fully self-delimiting, the C<json> read and write |
864 | types are an ideal simple RPC protocol: just exchange JSON datagrams. |
1663 | types are an ideal simple RPC protocol: just exchange JSON datagrams. See |
|
|
1664 | the C<json> write type description, above, for an actual example. |
865 | |
1665 | |
866 | =cut |
1666 | =cut |
867 | |
1667 | |
868 | register_read_type json => sub { |
1668 | register_read_type json => sub { |
869 | my ($self, $cb, $accept, $reject, $skip) = @_; |
1669 | my ($self, $cb) = @_; |
870 | |
1670 | |
871 | require JSON; |
1671 | my $json = $self->{json} ||= json_coder; |
872 | |
1672 | |
873 | my $data; |
1673 | my $data; |
874 | my $rbuf = \$self->{rbuf}; |
1674 | my $rbuf = \$self->{rbuf}; |
875 | |
1675 | |
876 | my $json = $self->{json} ||= JSON::XS->new->utf8; |
|
|
877 | |
|
|
878 | sub { |
1676 | sub { |
879 | my $ref = $json->incr_parse ($self->{rbuf}); |
1677 | my $ref = eval { $json->incr_parse ($_[0]{rbuf}) }; |
880 | |
1678 | |
881 | if ($ref) { |
1679 | if ($ref) { |
882 | $self->{rbuf} = $json->incr_text; |
1680 | $_[0]{rbuf} = $json->incr_text; |
883 | $json->incr_text = ""; |
1681 | $json->incr_text = ""; |
884 | $cb->($self, $ref); |
1682 | $cb->($_[0], $ref); |
885 | |
1683 | |
886 | 1 |
1684 | 1 |
|
|
1685 | } elsif ($@) { |
|
|
1686 | # error case |
|
|
1687 | $json->incr_skip; |
|
|
1688 | |
|
|
1689 | $_[0]{rbuf} = $json->incr_text; |
|
|
1690 | $json->incr_text = ""; |
|
|
1691 | |
|
|
1692 | $_[0]->_error (Errno::EBADMSG); |
|
|
1693 | |
|
|
1694 | () |
887 | } else { |
1695 | } else { |
888 | $self->{rbuf} = ""; |
1696 | $_[0]{rbuf} = ""; |
|
|
1697 | |
889 | () |
1698 | () |
890 | } |
1699 | } |
891 | } |
1700 | } |
892 | }; |
1701 | }; |
893 | |
1702 | |
|
|
1703 | =item storable => $cb->($handle, $ref) |
|
|
1704 | |
|
|
1705 | Deserialises a L<Storable> frozen representation as written by the |
|
|
1706 | C<storable> write type (BER-encoded length prefix followed by nfreeze'd |
|
|
1707 | data). |
|
|
1708 | |
|
|
1709 | Raises C<EBADMSG> error if the data could not be decoded. |
|
|
1710 | |
|
|
1711 | =cut |
|
|
1712 | |
|
|
1713 | register_read_type storable => sub { |
|
|
1714 | my ($self, $cb) = @_; |
|
|
1715 | |
|
|
1716 | require Storable unless $Storable::VERSION; |
|
|
1717 | |
|
|
1718 | sub { |
|
|
1719 | # when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method |
|
|
1720 | defined (my $len = eval { unpack "w", $_[0]{rbuf} }) |
|
|
1721 | or return; |
|
|
1722 | |
|
|
1723 | my $format = length pack "w", $len; |
|
|
1724 | |
|
|
1725 | # bypass unshift if we already have the remaining chunk |
|
|
1726 | if ($format + $len <= length $_[0]{rbuf}) { |
|
|
1727 | my $data = substr $_[0]{rbuf}, $format, $len; |
|
|
1728 | substr $_[0]{rbuf}, 0, $format + $len, ""; |
|
|
1729 | $cb->($_[0], Storable::thaw ($data)); |
|
|
1730 | } else { |
|
|
1731 | # remove prefix |
|
|
1732 | substr $_[0]{rbuf}, 0, $format, ""; |
|
|
1733 | |
|
|
1734 | # read remaining chunk |
|
|
1735 | $_[0]->unshift_read (chunk => $len, sub { |
|
|
1736 | if (my $ref = eval { Storable::thaw ($_[1]) }) { |
|
|
1737 | $cb->($_[0], $ref); |
|
|
1738 | } else { |
|
|
1739 | $_[0]->_error (Errno::EBADMSG); |
|
|
1740 | } |
|
|
1741 | }); |
|
|
1742 | } |
|
|
1743 | |
|
|
1744 | 1 |
|
|
1745 | } |
|
|
1746 | }; |
|
|
1747 | |
894 | =back |
1748 | =back |
895 | |
1749 | |
896 | =item AnyEvent::Handle::register_read_type type => $coderef->($handle, $cb, @args) |
1750 | =item custom read types - Package::anyevent_read_type $handle, $cb, @args |
897 | |
1751 | |
898 | This function (not method) lets you add your own types to C<push_read>. |
1752 | Instead of one of the predefined types, you can also specify the name |
|
|
1753 | of a package. AnyEvent will try to load the package and then expects to |
|
|
1754 | find a function named C<anyevent_read_type> inside. If it isn't found, it |
|
|
1755 | progressively tries to load the parent package until it either finds the |
|
|
1756 | function (good) or runs out of packages (bad). |
899 | |
1757 | |
900 | Whenever the given C<type> is used, C<push_read> will invoke the code |
1758 | Whenever this type is used, C<push_read> will invoke the function with the |
901 | reference with the handle object, the callback and the remaining |
1759 | handle object, the original callback and the remaining arguments. |
902 | arguments. |
|
|
903 | |
1760 | |
904 | The code reference is supposed to return a callback (usually a closure) |
1761 | The function is supposed to return a callback (usually a closure) that |
905 | that works as a plain read callback (see C<< ->push_read ($cb) >>). |
1762 | works as a plain read callback (see C<< ->push_read ($cb) >>), so you can |
|
|
1763 | mentally treat the function as a "configurable read type to read callback" |
|
|
1764 | converter. |
906 | |
1765 | |
907 | It should invoke the passed callback when it is done reading (remember to |
1766 | It should invoke the original callback when it is done reading (remember |
908 | pass C<$handle> as first argument as all other callbacks do that). |
1767 | to pass C<$handle> as first argument as all other callbacks do that, |
|
|
1768 | although there is no strict requirement on this). |
909 | |
1769 | |
910 | Note that this is a function, and all types registered this way will be |
|
|
911 | global, so try to use unique names. |
|
|
912 | |
|
|
913 | For examples, see the source of this module (F<perldoc -m AnyEvent::Handle>, |
1770 | For examples, see the source of this module (F<perldoc -m |
914 | search for C<register_read_type>)). |
1771 | AnyEvent::Handle>, search for C<register_read_type>)). |
915 | |
1772 | |
916 | =item $handle->stop_read |
1773 | =item $handle->stop_read |
917 | |
1774 | |
918 | =item $handle->start_read |
1775 | =item $handle->start_read |
919 | |
1776 | |
920 | In rare cases you actually do not want to read anything from the |
1777 | In rare cases you actually do not want to read anything from the |
921 | socket. In this case you can call C<stop_read>. Neither C<on_read> no |
1778 | socket. In this case you can call C<stop_read>. Neither C<on_read> nor |
922 | any queued callbacks will be executed then. To start reading again, call |
1779 | any queued callbacks will be executed then. To start reading again, call |
923 | C<start_read>. |
1780 | C<start_read>. |
924 | |
1781 | |
|
|
1782 | Note that AnyEvent::Handle will automatically C<start_read> for you when |
|
|
1783 | you change the C<on_read> callback or push/unshift a read callback, and it |
|
|
1784 | will automatically C<stop_read> for you when neither C<on_read> is set nor |
|
|
1785 | there are any read requests in the queue. |
|
|
1786 | |
|
|
1787 | In older versions of this module (<= 5.3), these methods had no effect, |
|
|
1788 | as TLS does not support half-duplex connections. In current versions they |
|
|
1789 | work as expected, as this behaviour is required to avoid certain resource |
|
|
1790 | attacks, where the program would be forced to read (and buffer) arbitrary |
|
|
1791 | amounts of data before being able to send some data. The drawback is that |
|
|
1792 | some readings of the the SSL/TLS specifications basically require this |
|
|
1793 | attack to be working, as SSL/TLS implementations might stall sending data |
|
|
1794 | during a rehandshake. |
|
|
1795 | |
|
|
1796 | As a guideline, during the initial handshake, you should not stop reading, |
|
|
1797 | and as a client, it might cause problems, depending on your application. |
|
|
1798 | |
925 | =cut |
1799 | =cut |
926 | |
1800 | |
927 | sub stop_read { |
1801 | sub stop_read { |
928 | my ($self) = @_; |
1802 | my ($self) = @_; |
929 | |
1803 | |
… | |
… | |
931 | } |
1805 | } |
932 | |
1806 | |
933 | sub start_read { |
1807 | sub start_read { |
934 | my ($self) = @_; |
1808 | my ($self) = @_; |
935 | |
1809 | |
936 | unless ($self->{_rw} || $self->{_eof}) { |
1810 | unless ($self->{_rw} || $self->{_eof} || !$self->{fh}) { |
937 | Scalar::Util::weaken $self; |
1811 | Scalar::Util::weaken $self; |
938 | |
1812 | |
939 | $self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub { |
1813 | $self->{_rw} = AE::io $self->{fh}, 0, sub { |
940 | my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf}; |
1814 | my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf}); |
941 | my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf; |
1815 | my $len = sysread $self->{fh}, $$rbuf, $self->{read_size}, length $$rbuf; |
942 | |
1816 | |
943 | if ($len > 0) { |
1817 | if ($len > 0) { |
944 | $self->{filter_r} |
1818 | $self->{_activity} = $self->{_ractivity} = AE::now; |
945 | ? $self->{filter_r}->($self, $rbuf) |
1819 | |
|
|
1820 | if ($self->{tls}) { |
|
|
1821 | Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf); |
|
|
1822 | |
|
|
1823 | &_dotls ($self); |
|
|
1824 | } else { |
946 | : $self->_drain_rbuf; |
1825 | $self->_drain_rbuf; |
|
|
1826 | } |
|
|
1827 | |
|
|
1828 | if ($len == $self->{read_size}) { |
|
|
1829 | $self->{read_size} *= 2; |
|
|
1830 | $self->{read_size} = $self->{max_read_size} || MAX_READ_SIZE |
|
|
1831 | if $self->{read_size} > ($self->{max_read_size} || MAX_READ_SIZE); |
|
|
1832 | } |
947 | |
1833 | |
948 | } elsif (defined $len) { |
1834 | } elsif (defined $len) { |
949 | delete $self->{_rw}; |
1835 | delete $self->{_rw}; |
950 | $self->{_eof} = 1; |
1836 | $self->{_eof} = 1; |
951 | $self->_drain_rbuf; |
1837 | $self->_drain_rbuf; |
952 | |
1838 | |
953 | } elsif ($! != EAGAIN && $! != EINTR && $! != &AnyEvent::Util::WSAWOULDBLOCK) { |
1839 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) { |
954 | return $self->error; |
1840 | return $self->_error ($!, 1); |
955 | } |
1841 | } |
956 | }); |
1842 | }; |
957 | } |
1843 | } |
958 | } |
1844 | } |
959 | |
1845 | |
|
|
1846 | our $ERROR_SYSCALL; |
|
|
1847 | our $ERROR_WANT_READ; |
|
|
1848 | |
|
|
1849 | sub _tls_error { |
|
|
1850 | my ($self, $err) = @_; |
|
|
1851 | |
|
|
1852 | return $self->_error ($!, 1) |
|
|
1853 | if $err == Net::SSLeay::ERROR_SYSCALL (); |
|
|
1854 | |
|
|
1855 | my $err =Net::SSLeay::ERR_error_string (Net::SSLeay::ERR_get_error ()); |
|
|
1856 | |
|
|
1857 | # reduce error string to look less scary |
|
|
1858 | $err =~ s/^error:[0-9a-fA-F]{8}:[^:]+:([^:]+):/\L$1: /; |
|
|
1859 | |
|
|
1860 | if ($self->{_on_starttls}) { |
|
|
1861 | (delete $self->{_on_starttls})->($self, undef, $err); |
|
|
1862 | &_freetls; |
|
|
1863 | } else { |
|
|
1864 | &_freetls; |
|
|
1865 | $self->_error (Errno::EPROTO, 1, $err); |
|
|
1866 | } |
|
|
1867 | } |
|
|
1868 | |
|
|
1869 | # poll the write BIO and send the data if applicable |
|
|
1870 | # also decode read data if possible |
|
|
1871 | # this is basiclaly our TLS state machine |
|
|
1872 | # more efficient implementations are possible with openssl, |
|
|
1873 | # but not with the buggy and incomplete Net::SSLeay. |
960 | sub _dotls { |
1874 | sub _dotls { |
961 | my ($self) = @_; |
1875 | my ($self) = @_; |
962 | |
1876 | |
|
|
1877 | my $tmp; |
|
|
1878 | |
963 | if (length $self->{_tls_wbuf}) { |
1879 | if (length $self->{_tls_wbuf}) { |
964 | while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) { |
1880 | while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) { |
965 | substr $self->{_tls_wbuf}, 0, $len, ""; |
1881 | substr $self->{_tls_wbuf}, 0, $tmp, ""; |
966 | } |
1882 | } |
967 | } |
|
|
968 | |
1883 | |
|
|
1884 | $tmp = Net::SSLeay::get_error ($self->{tls}, $tmp); |
|
|
1885 | return $self->_tls_error ($tmp) |
|
|
1886 | if $tmp != $ERROR_WANT_READ |
|
|
1887 | && ($tmp != $ERROR_SYSCALL || $!); |
|
|
1888 | } |
|
|
1889 | |
|
|
1890 | while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) { |
|
|
1891 | unless (length $tmp) { |
|
|
1892 | $self->{_on_starttls} |
|
|
1893 | and (delete $self->{_on_starttls})->($self, undef, "EOF during handshake"); # ??? |
|
|
1894 | &_freetls; |
|
|
1895 | |
|
|
1896 | if ($self->{on_stoptls}) { |
|
|
1897 | $self->{on_stoptls}($self); |
|
|
1898 | return; |
|
|
1899 | } else { |
|
|
1900 | # let's treat SSL-eof as we treat normal EOF |
|
|
1901 | delete $self->{_rw}; |
|
|
1902 | $self->{_eof} = 1; |
|
|
1903 | } |
|
|
1904 | } |
|
|
1905 | |
|
|
1906 | $self->{_tls_rbuf} .= $tmp; |
|
|
1907 | $self->_drain_rbuf; |
|
|
1908 | $self->{tls} or return; # tls session might have gone away in callback |
|
|
1909 | } |
|
|
1910 | |
|
|
1911 | $tmp = Net::SSLeay::get_error ($self->{tls}, -1); |
|
|
1912 | return $self->_tls_error ($tmp) |
|
|
1913 | if $tmp != $ERROR_WANT_READ |
|
|
1914 | && ($tmp != $ERROR_SYSCALL || $!); |
|
|
1915 | |
969 | if (defined (my $buf = Net::SSLeay::BIO_read ($self->{_wbio}))) { |
1916 | while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) { |
970 | $self->{wbuf} .= $buf; |
1917 | $self->{wbuf} .= $tmp; |
971 | $self->_drain_wbuf; |
1918 | $self->_drain_wbuf; |
|
|
1919 | $self->{tls} or return; # tls session might have gone away in callback |
972 | } |
1920 | } |
973 | |
1921 | |
974 | while (defined (my $buf = Net::SSLeay::read ($self->{tls}))) { |
1922 | $self->{_on_starttls} |
975 | $self->{rbuf} .= $buf; |
1923 | and Net::SSLeay::state ($self->{tls}) == Net::SSLeay::ST_OK () |
976 | $self->_drain_rbuf; |
1924 | and (delete $self->{_on_starttls})->($self, 1, "TLS/SSL connection established"); |
977 | } |
|
|
978 | |
|
|
979 | my $err = Net::SSLeay::get_error ($self->{tls}, -1); |
|
|
980 | |
|
|
981 | if ($err!= Net::SSLeay::ERROR_WANT_READ ()) { |
|
|
982 | if ($err == Net::SSLeay::ERROR_SYSCALL ()) { |
|
|
983 | $self->error; |
|
|
984 | } elsif ($err == Net::SSLeay::ERROR_SSL ()) { |
|
|
985 | $! = &Errno::EIO; |
|
|
986 | $self->error; |
|
|
987 | } |
|
|
988 | |
|
|
989 | # all others are fine for our purposes |
|
|
990 | } |
|
|
991 | } |
1925 | } |
992 | |
1926 | |
993 | =item $handle->starttls ($tls[, $tls_ctx]) |
1927 | =item $handle->starttls ($tls[, $tls_ctx]) |
994 | |
1928 | |
995 | Instead of starting TLS negotiation immediately when the AnyEvent::Handle |
1929 | Instead of starting TLS negotiation immediately when the AnyEvent::Handle |
996 | object is created, you can also do that at a later time by calling |
1930 | object is created, you can also do that at a later time by calling |
997 | C<starttls>. |
1931 | C<starttls>. |
998 | |
1932 | |
|
|
1933 | Starting TLS is currently an asynchronous operation - when you push some |
|
|
1934 | write data and then call C<< ->starttls >> then TLS negotiation will start |
|
|
1935 | immediately, after which the queued write data is then sent. |
|
|
1936 | |
999 | The first argument is the same as the C<tls> constructor argument (either |
1937 | The first argument is the same as the C<tls> constructor argument (either |
1000 | C<"connect">, C<"accept"> or an existing Net::SSLeay object). |
1938 | C<"connect">, C<"accept"> or an existing Net::SSLeay object). |
1001 | |
1939 | |
1002 | The second argument is the optional C<Net::SSLeay::CTX> object that is |
1940 | The second argument is the optional C<AnyEvent::TLS> object that is used |
1003 | used when AnyEvent::Handle has to create its own TLS connection object. |
1941 | when AnyEvent::Handle has to create its own TLS connection object, or |
|
|
1942 | a hash reference with C<< key => value >> pairs that will be used to |
|
|
1943 | construct a new context. |
1004 | |
1944 | |
1005 | The TLS connection object will end up in C<< $handle->{tls} >> after this |
1945 | The TLS connection object will end up in C<< $handle->{tls} >>, the TLS |
1006 | call and can be used or changed to your liking. Note that the handshake |
1946 | context in C<< $handle->{tls_ctx} >> after this call and can be used or |
1007 | might have already started when this function returns. |
1947 | changed to your liking. Note that the handshake might have already started |
|
|
1948 | when this function returns. |
1008 | |
1949 | |
1009 | =cut |
1950 | Due to bugs in OpenSSL, it might or might not be possible to do multiple |
|
|
1951 | handshakes on the same stream. It is best to not attempt to use the |
|
|
1952 | stream after stopping TLS. |
1010 | |
1953 | |
1011 | # TODO: maybe document... |
1954 | This method may invoke callbacks (and therefore the handle might be |
|
|
1955 | destroyed after it returns). |
|
|
1956 | |
|
|
1957 | =cut |
|
|
1958 | |
|
|
1959 | our %TLS_CACHE; #TODO not yet documented, should we? |
|
|
1960 | |
1012 | sub starttls { |
1961 | sub starttls { |
1013 | my ($self, $ssl, $ctx) = @_; |
1962 | my ($self, $tls, $ctx) = @_; |
1014 | |
1963 | |
1015 | $self->stoptls; |
1964 | Carp::croak "It is an error to call starttls on an AnyEvent::Handle object while TLS is already active, caught" |
|
|
1965 | if $self->{tls}; |
1016 | |
1966 | |
1017 | if ($ssl eq "accept") { |
1967 | $self->{tls} = $tls; |
1018 | $ssl = Net::SSLeay::new ($ctx || TLS_CTX ()); |
1968 | $self->{tls_ctx} = $ctx if @_ > 2; |
1019 | Net::SSLeay::set_accept_state ($ssl); |
1969 | |
1020 | } elsif ($ssl eq "connect") { |
1970 | return unless $self->{fh}; |
1021 | $ssl = Net::SSLeay::new ($ctx || TLS_CTX ()); |
1971 | |
1022 | Net::SSLeay::set_connect_state ($ssl); |
1972 | require Net::SSLeay; |
|
|
1973 | |
|
|
1974 | $ERROR_SYSCALL = Net::SSLeay::ERROR_SYSCALL (); |
|
|
1975 | $ERROR_WANT_READ = Net::SSLeay::ERROR_WANT_READ (); |
|
|
1976 | |
|
|
1977 | $tls = delete $self->{tls}; |
|
|
1978 | $ctx = $self->{tls_ctx}; |
|
|
1979 | |
|
|
1980 | local $Carp::CarpLevel = 1; # skip ourselves when creating a new context or session |
|
|
1981 | |
|
|
1982 | if ("HASH" eq ref $ctx) { |
|
|
1983 | require AnyEvent::TLS; |
|
|
1984 | |
|
|
1985 | if ($ctx->{cache}) { |
|
|
1986 | my $key = $ctx+0; |
|
|
1987 | $ctx = $TLS_CACHE{$key} ||= new AnyEvent::TLS %$ctx; |
|
|
1988 | } else { |
|
|
1989 | $ctx = new AnyEvent::TLS %$ctx; |
|
|
1990 | } |
|
|
1991 | } |
1023 | } |
1992 | |
1024 | |
1993 | $self->{tls_ctx} = $ctx || TLS_CTX (); |
1025 | $self->{tls} = $ssl; |
1994 | $self->{tls} = $tls = $self->{tls_ctx}->_get_session ($tls, $self, $self->{peername}); |
1026 | |
1995 | |
1027 | # basically, this is deep magic (because SSL_read should have the same issues) |
1996 | # basically, this is deep magic (because SSL_read should have the same issues) |
1028 | # but the openssl maintainers basically said: "trust us, it just works". |
1997 | # but the openssl maintainers basically said: "trust us, it just works". |
1029 | # (unfortunately, we have to hardcode constants because the abysmally misdesigned |
1998 | # (unfortunately, we have to hardcode constants because the abysmally misdesigned |
1030 | # and mismaintained ssleay-module doesn't even offer them). |
1999 | # and mismaintained ssleay-module doesn't even offer them). |
1031 | # http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html |
2000 | # http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html |
|
|
2001 | # |
|
|
2002 | # in short: this is a mess. |
|
|
2003 | # |
|
|
2004 | # note that we do not try to keep the length constant between writes as we are required to do. |
|
|
2005 | # we assume that most (but not all) of this insanity only applies to non-blocking cases, |
|
|
2006 | # and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to |
|
|
2007 | # have identity issues in that area. |
1032 | Net::SSLeay::CTX_set_mode ($self->{tls}, |
2008 | # Net::SSLeay::CTX_set_mode ($ssl, |
1033 | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1) |
2009 | # (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1) |
1034 | | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2)); |
2010 | # | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2)); |
|
|
2011 | Net::SSLeay::CTX_set_mode ($tls, 1|2); |
1035 | |
2012 | |
1036 | $self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
2013 | $self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
1037 | $self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
2014 | $self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
1038 | |
2015 | |
|
|
2016 | Net::SSLeay::BIO_write ($self->{_rbio}, $self->{rbuf}); |
|
|
2017 | $self->{rbuf} = ""; |
|
|
2018 | |
1039 | Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio}); |
2019 | Net::SSLeay::set_bio ($tls, $self->{_rbio}, $self->{_wbio}); |
1040 | |
2020 | |
1041 | $self->{filter_w} = sub { |
2021 | $self->{_on_starttls} = sub { $_[0]{on_starttls}(@_) } |
1042 | $_[0]{_tls_wbuf} .= ${$_[1]}; |
2022 | if $self->{on_starttls}; |
1043 | &_dotls; |
2023 | |
1044 | }; |
2024 | &_dotls; # need to trigger the initial handshake |
1045 | $self->{filter_r} = sub { |
2025 | $self->start_read; # make sure we actually do read |
1046 | Net::SSLeay::BIO_write ($_[0]{_rbio}, ${$_[1]}); |
|
|
1047 | &_dotls; |
|
|
1048 | }; |
|
|
1049 | } |
2026 | } |
1050 | |
2027 | |
1051 | =item $handle->stoptls |
2028 | =item $handle->stoptls |
1052 | |
2029 | |
1053 | Destroys the SSL connection, if any. Partial read or write data will be |
2030 | Shuts down the SSL connection - this makes a proper EOF handshake by |
1054 | lost. |
2031 | sending a close notify to the other side, but since OpenSSL doesn't |
|
|
2032 | support non-blocking shut downs, it is not guaranteed that you can re-use |
|
|
2033 | the stream afterwards. |
|
|
2034 | |
|
|
2035 | This method may invoke callbacks (and therefore the handle might be |
|
|
2036 | destroyed after it returns). |
1055 | |
2037 | |
1056 | =cut |
2038 | =cut |
1057 | |
2039 | |
1058 | sub stoptls { |
2040 | sub stoptls { |
1059 | my ($self) = @_; |
2041 | my ($self) = @_; |
1060 | |
2042 | |
1061 | Net::SSLeay::free (delete $self->{tls}) if $self->{tls}; |
2043 | if ($self->{tls} && $self->{fh}) { |
|
|
2044 | Net::SSLeay::shutdown ($self->{tls}); |
1062 | |
2045 | |
1063 | delete $self->{_rbio}; |
2046 | &_dotls; |
1064 | delete $self->{_wbio}; |
2047 | |
1065 | delete $self->{_tls_wbuf}; |
2048 | # # we don't give a shit. no, we do, but we can't. no...#d# |
1066 | delete $self->{filter_r}; |
2049 | # # we, we... have to use openssl :/#d# |
1067 | delete $self->{filter_w}; |
2050 | # &_freetls;#d# |
|
|
2051 | } |
1068 | } |
2052 | } |
|
|
2053 | |
|
|
2054 | sub _freetls { |
|
|
2055 | my ($self) = @_; |
|
|
2056 | |
|
|
2057 | return unless $self->{tls}; |
|
|
2058 | |
|
|
2059 | $self->{tls_ctx}->_put_session (delete $self->{tls}) |
|
|
2060 | if $self->{tls} > 0; |
|
|
2061 | |
|
|
2062 | delete @$self{qw(_rbio _wbio _tls_wbuf _on_starttls)}; |
|
|
2063 | } |
|
|
2064 | |
|
|
2065 | =item $handle->resettls |
|
|
2066 | |
|
|
2067 | This rarely-used method simply resets and TLS state on the handle, usually |
|
|
2068 | causing data loss. |
|
|
2069 | |
|
|
2070 | One case where it may be useful is when you want to skip over the data in |
|
|
2071 | the stream but you are not interested in interpreting it, so data loss is |
|
|
2072 | no concern. |
|
|
2073 | |
|
|
2074 | =cut |
|
|
2075 | |
|
|
2076 | *resettls = \&_freetls; |
1069 | |
2077 | |
1070 | sub DESTROY { |
2078 | sub DESTROY { |
1071 | my $self = shift; |
2079 | my ($self) = @_; |
1072 | |
2080 | |
1073 | $self->stoptls; |
2081 | &_freetls; |
|
|
2082 | |
|
|
2083 | my $linger = exists $self->{linger} ? $self->{linger} : 3600; |
|
|
2084 | |
|
|
2085 | if ($linger && length $self->{wbuf} && $self->{fh}) { |
|
|
2086 | my $fh = delete $self->{fh}; |
|
|
2087 | my $wbuf = delete $self->{wbuf}; |
|
|
2088 | |
|
|
2089 | my @linger; |
|
|
2090 | |
|
|
2091 | push @linger, AE::io $fh, 1, sub { |
|
|
2092 | my $len = syswrite $fh, $wbuf, length $wbuf; |
|
|
2093 | |
|
|
2094 | if ($len > 0) { |
|
|
2095 | substr $wbuf, 0, $len, ""; |
|
|
2096 | } elsif (defined $len || ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK)) { |
|
|
2097 | @linger = (); # end |
|
|
2098 | } |
|
|
2099 | }; |
|
|
2100 | push @linger, AE::timer $linger, 0, sub { |
|
|
2101 | @linger = (); |
|
|
2102 | }; |
|
|
2103 | } |
1074 | } |
2104 | } |
|
|
2105 | |
|
|
2106 | =item $handle->destroy |
|
|
2107 | |
|
|
2108 | Shuts down the handle object as much as possible - this call ensures that |
|
|
2109 | no further callbacks will be invoked and as many resources as possible |
|
|
2110 | will be freed. Any method you will call on the handle object after |
|
|
2111 | destroying it in this way will be silently ignored (and it will return the |
|
|
2112 | empty list). |
|
|
2113 | |
|
|
2114 | Normally, you can just "forget" any references to an AnyEvent::Handle |
|
|
2115 | object and it will simply shut down. This works in fatal error and EOF |
|
|
2116 | callbacks, as well as code outside. It does I<NOT> work in a read or write |
|
|
2117 | callback, so when you want to destroy the AnyEvent::Handle object from |
|
|
2118 | within such an callback. You I<MUST> call C<< ->destroy >> explicitly in |
|
|
2119 | that case. |
|
|
2120 | |
|
|
2121 | Destroying the handle object in this way has the advantage that callbacks |
|
|
2122 | will be removed as well, so if those are the only reference holders (as |
|
|
2123 | is common), then one doesn't need to do anything special to break any |
|
|
2124 | reference cycles. |
|
|
2125 | |
|
|
2126 | The handle might still linger in the background and write out remaining |
|
|
2127 | data, as specified by the C<linger> option, however. |
|
|
2128 | |
|
|
2129 | =cut |
|
|
2130 | |
|
|
2131 | sub destroy { |
|
|
2132 | my ($self) = @_; |
|
|
2133 | |
|
|
2134 | $self->DESTROY; |
|
|
2135 | %$self = (); |
|
|
2136 | bless $self, "AnyEvent::Handle::destroyed"; |
|
|
2137 | } |
|
|
2138 | |
|
|
2139 | sub AnyEvent::Handle::destroyed::AUTOLOAD { |
|
|
2140 | #nop |
|
|
2141 | } |
|
|
2142 | |
|
|
2143 | =item $handle->destroyed |
|
|
2144 | |
|
|
2145 | Returns false as long as the handle hasn't been destroyed by a call to C<< |
|
|
2146 | ->destroy >>, true otherwise. |
|
|
2147 | |
|
|
2148 | Can be useful to decide whether the handle is still valid after some |
|
|
2149 | callback possibly destroyed the handle. For example, C<< ->push_write >>, |
|
|
2150 | C<< ->starttls >> and other methods can call user callbacks, which in turn |
|
|
2151 | can destroy the handle, so work can be avoided by checking sometimes: |
|
|
2152 | |
|
|
2153 | $hdl->starttls ("accept"); |
|
|
2154 | return if $hdl->destroyed; |
|
|
2155 | $hdl->push_write (... |
|
|
2156 | |
|
|
2157 | Note that the call to C<push_write> will silently be ignored if the handle |
|
|
2158 | has been destroyed, so often you can just ignore the possibility of the |
|
|
2159 | handle being destroyed. |
|
|
2160 | |
|
|
2161 | =cut |
|
|
2162 | |
|
|
2163 | sub destroyed { 0 } |
|
|
2164 | sub AnyEvent::Handle::destroyed::destroyed { 1 } |
1075 | |
2165 | |
1076 | =item AnyEvent::Handle::TLS_CTX |
2166 | =item AnyEvent::Handle::TLS_CTX |
1077 | |
2167 | |
1078 | This function creates and returns the Net::SSLeay::CTX object used by |
2168 | This function creates and returns the AnyEvent::TLS object used by default |
1079 | default for TLS mode. |
2169 | for TLS mode. |
1080 | |
2170 | |
1081 | The context is created like this: |
2171 | The context is created by calling L<AnyEvent::TLS> without any arguments. |
1082 | |
|
|
1083 | Net::SSLeay::load_error_strings; |
|
|
1084 | Net::SSLeay::SSLeay_add_ssl_algorithms; |
|
|
1085 | Net::SSLeay::randomize; |
|
|
1086 | |
|
|
1087 | my $CTX = Net::SSLeay::CTX_new; |
|
|
1088 | |
|
|
1089 | Net::SSLeay::CTX_set_options $CTX, Net::SSLeay::OP_ALL |
|
|
1090 | |
2172 | |
1091 | =cut |
2173 | =cut |
1092 | |
2174 | |
1093 | our $TLS_CTX; |
2175 | our $TLS_CTX; |
1094 | |
2176 | |
1095 | sub TLS_CTX() { |
2177 | sub TLS_CTX() { |
1096 | $TLS_CTX || do { |
2178 | $TLS_CTX ||= do { |
1097 | require Net::SSLeay; |
2179 | require AnyEvent::TLS; |
1098 | |
2180 | |
1099 | Net::SSLeay::load_error_strings (); |
2181 | new AnyEvent::TLS |
1100 | Net::SSLeay::SSLeay_add_ssl_algorithms (); |
|
|
1101 | Net::SSLeay::randomize (); |
|
|
1102 | |
|
|
1103 | $TLS_CTX = Net::SSLeay::CTX_new (); |
|
|
1104 | |
|
|
1105 | Net::SSLeay::CTX_set_options ($TLS_CTX, Net::SSLeay::OP_ALL ()); |
|
|
1106 | |
|
|
1107 | $TLS_CTX |
|
|
1108 | } |
2182 | } |
1109 | } |
2183 | } |
1110 | |
2184 | |
1111 | =back |
2185 | =back |
|
|
2186 | |
|
|
2187 | |
|
|
2188 | =head1 NONFREQUENTLY ASKED QUESTIONS |
|
|
2189 | |
|
|
2190 | =over 4 |
|
|
2191 | |
|
|
2192 | =item I C<undef> the AnyEvent::Handle reference inside my callback and |
|
|
2193 | still get further invocations! |
|
|
2194 | |
|
|
2195 | That's because AnyEvent::Handle keeps a reference to itself when handling |
|
|
2196 | read or write callbacks. |
|
|
2197 | |
|
|
2198 | It is only safe to "forget" the reference inside EOF or error callbacks, |
|
|
2199 | from within all other callbacks, you need to explicitly call the C<< |
|
|
2200 | ->destroy >> method. |
|
|
2201 | |
|
|
2202 | =item Why is my C<on_eof> callback never called? |
|
|
2203 | |
|
|
2204 | Probably because your C<on_error> callback is being called instead: When |
|
|
2205 | you have outstanding requests in your read queue, then an EOF is |
|
|
2206 | considered an error as you clearly expected some data. |
|
|
2207 | |
|
|
2208 | To avoid this, make sure you have an empty read queue whenever your handle |
|
|
2209 | is supposed to be "idle" (i.e. connection closes are O.K.). You can set |
|
|
2210 | an C<on_read> handler that simply pushes the first read requests in the |
|
|
2211 | queue. |
|
|
2212 | |
|
|
2213 | See also the next question, which explains this in a bit more detail. |
|
|
2214 | |
|
|
2215 | =item How can I serve requests in a loop? |
|
|
2216 | |
|
|
2217 | Most protocols consist of some setup phase (authentication for example) |
|
|
2218 | followed by a request handling phase, where the server waits for requests |
|
|
2219 | and handles them, in a loop. |
|
|
2220 | |
|
|
2221 | There are two important variants: The first (traditional, better) variant |
|
|
2222 | handles requests until the server gets some QUIT command, causing it to |
|
|
2223 | close the connection first (highly desirable for a busy TCP server). A |
|
|
2224 | client dropping the connection is an error, which means this variant can |
|
|
2225 | detect an unexpected detection close. |
|
|
2226 | |
|
|
2227 | To handle this case, always make sure you have a on-empty read queue, by |
|
|
2228 | pushing the "read request start" handler on it: |
|
|
2229 | |
|
|
2230 | # we assume a request starts with a single line |
|
|
2231 | my @start_request; @start_request = (line => sub { |
|
|
2232 | my ($hdl, $line) = @_; |
|
|
2233 | |
|
|
2234 | ... handle request |
|
|
2235 | |
|
|
2236 | # push next request read, possibly from a nested callback |
|
|
2237 | $hdl->push_read (@start_request); |
|
|
2238 | }); |
|
|
2239 | |
|
|
2240 | # auth done, now go into request handling loop |
|
|
2241 | # now push the first @start_request |
|
|
2242 | $hdl->push_read (@start_request); |
|
|
2243 | |
|
|
2244 | By always having an outstanding C<push_read>, the handle always expects |
|
|
2245 | some data and raises the C<EPIPE> error when the connction is dropped |
|
|
2246 | unexpectedly. |
|
|
2247 | |
|
|
2248 | The second variant is a protocol where the client can drop the connection |
|
|
2249 | at any time. For TCP, this means that the server machine may run out of |
|
|
2250 | sockets easier, and in general, it means you cannot distinguish a protocl |
|
|
2251 | failure/client crash from a normal connection close. Nevertheless, these |
|
|
2252 | kinds of protocols are common (and sometimes even the best solution to the |
|
|
2253 | problem). |
|
|
2254 | |
|
|
2255 | Having an outstanding read request at all times is possible if you ignore |
|
|
2256 | C<EPIPE> errors, but this doesn't help with when the client drops the |
|
|
2257 | connection during a request, which would still be an error. |
|
|
2258 | |
|
|
2259 | A better solution is to push the initial request read in an C<on_read> |
|
|
2260 | callback. This avoids an error, as when the server doesn't expect data |
|
|
2261 | (i.e. is idly waiting for the next request, an EOF will not raise an |
|
|
2262 | error, but simply result in an C<on_eof> callback. It is also a bit slower |
|
|
2263 | and simpler: |
|
|
2264 | |
|
|
2265 | # auth done, now go into request handling loop |
|
|
2266 | $hdl->on_read (sub { |
|
|
2267 | my ($hdl) = @_; |
|
|
2268 | |
|
|
2269 | # called each time we receive data but the read queue is empty |
|
|
2270 | # simply start read the request |
|
|
2271 | |
|
|
2272 | $hdl->push_read (line => sub { |
|
|
2273 | my ($hdl, $line) = @_; |
|
|
2274 | |
|
|
2275 | ... handle request |
|
|
2276 | |
|
|
2277 | # do nothing special when the request has been handled, just |
|
|
2278 | # let the request queue go empty. |
|
|
2279 | }); |
|
|
2280 | }); |
|
|
2281 | |
|
|
2282 | =item I get different callback invocations in TLS mode/Why can't I pause |
|
|
2283 | reading? |
|
|
2284 | |
|
|
2285 | Unlike, say, TCP, TLS connections do not consist of two independent |
|
|
2286 | communication channels, one for each direction. Or put differently, the |
|
|
2287 | read and write directions are not independent of each other: you cannot |
|
|
2288 | write data unless you are also prepared to read, and vice versa. |
|
|
2289 | |
|
|
2290 | This means that, in TLS mode, you might get C<on_error> or C<on_eof> |
|
|
2291 | callback invocations when you are not expecting any read data - the reason |
|
|
2292 | is that AnyEvent::Handle always reads in TLS mode. |
|
|
2293 | |
|
|
2294 | During the connection, you have to make sure that you always have a |
|
|
2295 | non-empty read-queue, or an C<on_read> watcher. At the end of the |
|
|
2296 | connection (or when you no longer want to use it) you can call the |
|
|
2297 | C<destroy> method. |
|
|
2298 | |
|
|
2299 | =item How do I read data until the other side closes the connection? |
|
|
2300 | |
|
|
2301 | If you just want to read your data into a perl scalar, the easiest way |
|
|
2302 | to achieve this is by setting an C<on_read> callback that does nothing, |
|
|
2303 | clearing the C<on_eof> callback and in the C<on_error> callback, the data |
|
|
2304 | will be in C<$_[0]{rbuf}>: |
|
|
2305 | |
|
|
2306 | $handle->on_read (sub { }); |
|
|
2307 | $handle->on_eof (undef); |
|
|
2308 | $handle->on_error (sub { |
|
|
2309 | my $data = delete $_[0]{rbuf}; |
|
|
2310 | }); |
|
|
2311 | |
|
|
2312 | Note that this example removes the C<rbuf> member from the handle object, |
|
|
2313 | which is not normally allowed by the API. It is expressly permitted in |
|
|
2314 | this case only, as the handle object needs to be destroyed afterwards. |
|
|
2315 | |
|
|
2316 | The reason to use C<on_error> is that TCP connections, due to latencies |
|
|
2317 | and packets loss, might get closed quite violently with an error, when in |
|
|
2318 | fact all data has been received. |
|
|
2319 | |
|
|
2320 | It is usually better to use acknowledgements when transferring data, |
|
|
2321 | to make sure the other side hasn't just died and you got the data |
|
|
2322 | intact. This is also one reason why so many internet protocols have an |
|
|
2323 | explicit QUIT command. |
|
|
2324 | |
|
|
2325 | =item I don't want to destroy the handle too early - how do I wait until |
|
|
2326 | all data has been written? |
|
|
2327 | |
|
|
2328 | After writing your last bits of data, set the C<on_drain> callback |
|
|
2329 | and destroy the handle in there - with the default setting of |
|
|
2330 | C<low_water_mark> this will be called precisely when all data has been |
|
|
2331 | written to the socket: |
|
|
2332 | |
|
|
2333 | $handle->push_write (...); |
|
|
2334 | $handle->on_drain (sub { |
|
|
2335 | AE::log debug => "all data submitted to the kernel\n"; |
|
|
2336 | undef $handle; |
|
|
2337 | }); |
|
|
2338 | |
|
|
2339 | If you just want to queue some data and then signal EOF to the other side, |
|
|
2340 | consider using C<< ->push_shutdown >> instead. |
|
|
2341 | |
|
|
2342 | =item I want to contact a TLS/SSL server, I don't care about security. |
|
|
2343 | |
|
|
2344 | If your TLS server is a pure TLS server (e.g. HTTPS) that only speaks TLS, |
|
|
2345 | connect to it and then create the AnyEvent::Handle with the C<tls> |
|
|
2346 | parameter: |
|
|
2347 | |
|
|
2348 | tcp_connect $host, $port, sub { |
|
|
2349 | my ($fh) = @_; |
|
|
2350 | |
|
|
2351 | my $handle = new AnyEvent::Handle |
|
|
2352 | fh => $fh, |
|
|
2353 | tls => "connect", |
|
|
2354 | on_error => sub { ... }; |
|
|
2355 | |
|
|
2356 | $handle->push_write (...); |
|
|
2357 | }; |
|
|
2358 | |
|
|
2359 | =item I want to contact a TLS/SSL server, I do care about security. |
|
|
2360 | |
|
|
2361 | Then you should additionally enable certificate verification, including |
|
|
2362 | peername verification, if the protocol you use supports it (see |
|
|
2363 | L<AnyEvent::TLS>, C<verify_peername>). |
|
|
2364 | |
|
|
2365 | E.g. for HTTPS: |
|
|
2366 | |
|
|
2367 | tcp_connect $host, $port, sub { |
|
|
2368 | my ($fh) = @_; |
|
|
2369 | |
|
|
2370 | my $handle = new AnyEvent::Handle |
|
|
2371 | fh => $fh, |
|
|
2372 | peername => $host, |
|
|
2373 | tls => "connect", |
|
|
2374 | tls_ctx => { verify => 1, verify_peername => "https" }, |
|
|
2375 | ... |
|
|
2376 | |
|
|
2377 | Note that you must specify the hostname you connected to (or whatever |
|
|
2378 | "peername" the protocol needs) as the C<peername> argument, otherwise no |
|
|
2379 | peername verification will be done. |
|
|
2380 | |
|
|
2381 | The above will use the system-dependent default set of trusted CA |
|
|
2382 | certificates. If you want to check against a specific CA, add the |
|
|
2383 | C<ca_file> (or C<ca_cert>) arguments to C<tls_ctx>: |
|
|
2384 | |
|
|
2385 | tls_ctx => { |
|
|
2386 | verify => 1, |
|
|
2387 | verify_peername => "https", |
|
|
2388 | ca_file => "my-ca-cert.pem", |
|
|
2389 | }, |
|
|
2390 | |
|
|
2391 | =item I want to create a TLS/SSL server, how do I do that? |
|
|
2392 | |
|
|
2393 | Well, you first need to get a server certificate and key. You have |
|
|
2394 | three options: a) ask a CA (buy one, use cacert.org etc.) b) create a |
|
|
2395 | self-signed certificate (cheap. check the search engine of your choice, |
|
|
2396 | there are many tutorials on the net) or c) make your own CA (tinyca2 is a |
|
|
2397 | nice program for that purpose). |
|
|
2398 | |
|
|
2399 | Then create a file with your private key (in PEM format, see |
|
|
2400 | L<AnyEvent::TLS>), followed by the certificate (also in PEM format). The |
|
|
2401 | file should then look like this: |
|
|
2402 | |
|
|
2403 | -----BEGIN RSA PRIVATE KEY----- |
|
|
2404 | ...header data |
|
|
2405 | ... lots of base64'y-stuff |
|
|
2406 | -----END RSA PRIVATE KEY----- |
|
|
2407 | |
|
|
2408 | -----BEGIN CERTIFICATE----- |
|
|
2409 | ... lots of base64'y-stuff |
|
|
2410 | -----END CERTIFICATE----- |
|
|
2411 | |
|
|
2412 | The important bits are the "PRIVATE KEY" and "CERTIFICATE" parts. Then |
|
|
2413 | specify this file as C<cert_file>: |
|
|
2414 | |
|
|
2415 | tcp_server undef, $port, sub { |
|
|
2416 | my ($fh) = @_; |
|
|
2417 | |
|
|
2418 | my $handle = new AnyEvent::Handle |
|
|
2419 | fh => $fh, |
|
|
2420 | tls => "accept", |
|
|
2421 | tls_ctx => { cert_file => "my-server-keycert.pem" }, |
|
|
2422 | ... |
|
|
2423 | |
|
|
2424 | When you have intermediate CA certificates that your clients might not |
|
|
2425 | know about, just append them to the C<cert_file>. |
|
|
2426 | |
|
|
2427 | =back |
|
|
2428 | |
1112 | |
2429 | |
1113 | =head1 SUBCLASSING AnyEvent::Handle |
2430 | =head1 SUBCLASSING AnyEvent::Handle |
1114 | |
2431 | |
1115 | In many cases, you might want to subclass AnyEvent::Handle. |
2432 | In many cases, you might want to subclass AnyEvent::Handle. |
1116 | |
2433 | |
… | |
… | |
1120 | =over 4 |
2437 | =over 4 |
1121 | |
2438 | |
1122 | =item * all constructor arguments become object members. |
2439 | =item * all constructor arguments become object members. |
1123 | |
2440 | |
1124 | At least initially, when you pass a C<tls>-argument to the constructor it |
2441 | At least initially, when you pass a C<tls>-argument to the constructor it |
1125 | will end up in C<< $handle->{tls} >>. Those members might be changes or |
2442 | will end up in C<< $handle->{tls} >>. Those members might be changed or |
1126 | mutated later on (for example C<tls> will hold the TLS connection object). |
2443 | mutated later on (for example C<tls> will hold the TLS connection object). |
1127 | |
2444 | |
1128 | =item * other object member names are prefixed with an C<_>. |
2445 | =item * other object member names are prefixed with an C<_>. |
1129 | |
2446 | |
1130 | All object members not explicitly documented (internal use) are prefixed |
2447 | All object members not explicitly documented (internal use) are prefixed |
… | |
… | |
1133 | |
2450 | |
1134 | =item * all members not documented here and not prefixed with an underscore |
2451 | =item * all members not documented here and not prefixed with an underscore |
1135 | are free to use in subclasses. |
2452 | are free to use in subclasses. |
1136 | |
2453 | |
1137 | Of course, new versions of AnyEvent::Handle may introduce more "public" |
2454 | Of course, new versions of AnyEvent::Handle may introduce more "public" |
1138 | member variables, but thats just life, at least it is documented. |
2455 | member variables, but that's just life. At least it is documented. |
1139 | |
2456 | |
1140 | =back |
2457 | =back |
1141 | |
2458 | |
1142 | =head1 AUTHOR |
2459 | =head1 AUTHOR |
1143 | |
2460 | |