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 (); |
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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 file handles via AnyEvent |
16 | |
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17 | This module is experimental. |
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18 | |
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19 | =cut |
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20 | |
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21 | our $VERSION = '0.04'; |
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22 | |
4 | |
23 | =head1 SYNOPSIS |
5 | =head1 SYNOPSIS |
24 | |
6 | |
25 | use AnyEvent; |
7 | use AnyEvent; |
26 | use AnyEvent::Handle; |
8 | use AnyEvent::Handle; |
27 | |
9 | |
28 | my $cv = AnyEvent->condvar; |
10 | my $cv = AnyEvent->condvar; |
29 | |
11 | |
30 | my $ae_fh = AnyEvent::Handle->new (fh => \*STDIN); |
12 | my $hdl; $hdl = new AnyEvent::Handle |
31 | |
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32 | #TODO |
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33 | |
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34 | # or use the constructor to pass the callback: |
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35 | |
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36 | my $ae_fh2 = |
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37 | AnyEvent::Handle->new ( |
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38 | fh => \*STDIN, |
13 | fh => \*STDIN, |
39 | on_eof => sub { |
14 | on_error => sub { |
40 | $cv->broadcast; |
15 | my ($hdl, $fatal, $msg) = @_; |
41 | }, |
16 | warn "got error $msg\n"; |
42 | #TODO |
17 | $hdl->destroy; |
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18 | $cv->send; |
43 | ); |
19 | }; |
44 | |
20 | |
45 | $cv->wait; |
21 | # send some request line |
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22 | $hdl->push_write ("getinfo\015\012"); |
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23 | |
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24 | # read the response line |
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25 | $hdl->push_read (line => sub { |
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26 | my ($hdl, $line) = @_; |
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27 | warn "got line <$line>\n"; |
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28 | $cv->send; |
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29 | }); |
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30 | |
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31 | $cv->recv; |
46 | |
32 | |
47 | =head1 DESCRIPTION |
33 | =head1 DESCRIPTION |
48 | |
34 | |
49 | This module is a helper module to make it easier to do event-based I/O on |
35 | This module is a helper module to make it easier to do event-based I/O on |
50 | filehandles. For utility functions for doing non-blocking connects and accepts |
36 | filehandles. |
51 | on sockets see L<AnyEvent::Util>. |
37 | |
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38 | The L<AnyEvent::Intro> tutorial contains some well-documented |
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39 | AnyEvent::Handle examples. |
52 | |
40 | |
53 | In the following, when the documentation refers to of "bytes" then this |
41 | In the following, when the documentation refers to of "bytes" then this |
54 | means characters. As sysread and syswrite are used for all I/O, their |
42 | means characters. As sysread and syswrite are used for all I/O, their |
55 | treatment of characters applies to this module as well. |
43 | treatment of characters applies to this module as well. |
56 | |
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. |
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47 | |
57 | 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 |
58 | argument. |
49 | argument. |
59 | |
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 | |
60 | =head1 METHODS |
80 | =head1 METHODS |
61 | |
81 | |
62 | =over 4 |
82 | =over 4 |
63 | |
83 | |
64 | =item B<new (%args)> |
84 | =item $handle = B<new> AnyEvent::Handle fh => $filehandle, key => value... |
65 | |
85 | |
66 | The constructor supports these arguments (all as key => value pairs). |
86 | The constructor supports these arguments (all as C<< key => value >> pairs). |
67 | |
87 | |
68 | =over 4 |
88 | =over 4 |
69 | |
89 | |
70 | =item fh => $filehandle [MANDATORY] |
90 | =item fh => $filehandle [C<fh> or C<connect> MANDATORY] |
71 | |
91 | |
72 | The filehandle this L<AnyEvent::Handle> object will operate on. |
92 | The filehandle this L<AnyEvent::Handle> object will operate on. |
73 | |
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74 | NOTE: The filehandle will be set to non-blocking (using |
93 | NOTE: The filehandle will be set to non-blocking mode (using |
75 | AnyEvent::Util::fh_nonblocking). |
94 | C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in |
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95 | that mode. |
76 | |
96 | |
77 | =item on_eof => $cb->($self) |
97 | =item connect => [$host, $service] [C<fh> or C<connect> MANDATORY] |
78 | |
98 | |
79 | Set the callback to be called on EOF. |
99 | Try to connect to the specified host and service (port), using |
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100 | C<AnyEvent::Socket::tcp_connect>. The C<$host> additionally becomes the |
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101 | default C<peername>. |
80 | |
102 | |
81 | While not mandatory, it is highly recommended to set an eof callback, |
103 | You have to specify either this parameter, or C<fh>, above. |
82 | otherwise you might end up with a closed socket while you are still |
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83 | waiting for data. |
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84 | |
104 | |
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105 | It is possible to push requests on the read and write queues, and modify |
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106 | properties of the stream, even while AnyEvent::Handle is connecting. |
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107 | |
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108 | When this parameter is specified, then the C<on_prepare>, |
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109 | C<on_connect_error> and C<on_connect> callbacks will be called under the |
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110 | appropriate circumstances: |
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111 | |
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112 | =over 4 |
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113 | |
85 | =item on_error => $cb->($self) |
114 | =item on_prepare => $cb->($handle) |
86 | |
115 | |
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116 | This (rarely used) callback is called before a new connection is |
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117 | attempted, but after the file handle has been created. It could be used to |
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118 | prepare the file handle with parameters required for the actual connect |
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119 | (as opposed to settings that can be changed when the connection is already |
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120 | established). |
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121 | |
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122 | The return value of this callback should be the connect timeout value in |
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123 | seconds (or C<0>, or C<undef>, or the empty list, to indicate the default |
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124 | timeout is to be used). |
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125 | |
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126 | =item on_connect => $cb->($handle, $host, $port, $retry->()) |
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127 | |
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128 | This callback is called when a connection has been successfully established. |
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129 | |
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130 | The actual numeric host and port (the socket peername) are passed as |
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131 | parameters, together with a retry callback. |
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132 | |
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133 | When, for some reason, the handle is not acceptable, then calling |
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134 | C<$retry> will continue with the next connection target (in case of |
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135 | multi-homed hosts or SRV records there can be multiple connection |
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136 | endpoints). At the time it is called the read and write queues, eof |
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137 | status, tls status and similar properties of the handle will have been |
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138 | reset. |
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139 | |
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140 | In most cases, ignoring the C<$retry> parameter is the way to go. |
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141 | |
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142 | =item on_connect_error => $cb->($handle, $message) |
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143 | |
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144 | This callback is called when the connection could not be |
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145 | established. C<$!> will contain the relevant error code, and C<$message> a |
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146 | message describing it (usually the same as C<"$!">). |
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147 | |
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148 | If this callback isn't specified, then C<on_error> will be called with a |
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149 | fatal error instead. |
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150 | |
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151 | =back |
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152 | |
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153 | =item on_error => $cb->($handle, $fatal, $message) |
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154 | |
87 | This is the fatal error callback, that is called when, well, a fatal error |
155 | This is the error callback, which is called when, well, some error |
88 | occurs, such as not being able to resolve the hostname, failure to connect |
156 | occured, such as not being able to resolve the hostname, failure to |
89 | or a read error. |
157 | connect or a read error. |
90 | |
158 | |
91 | The object will not be in a usable state when this callback has been |
159 | Some errors are fatal (which is indicated by C<$fatal> being true). On |
92 | called. |
160 | fatal errors the handle object will be destroyed (by a call to C<< -> |
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161 | destroy >>) after invoking the error callback (which means you are free to |
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162 | examine the handle object). Examples of fatal errors are an EOF condition |
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163 | with active (but unsatisifable) read watchers (C<EPIPE>) or I/O errors. In |
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164 | cases where the other side can close the connection at their will it is |
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165 | often easiest to not report C<EPIPE> errors in this callback. |
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166 | |
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167 | AnyEvent::Handle tries to find an appropriate error code for you to check |
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168 | against, but in some cases (TLS errors), this does not work well. It is |
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169 | recommended to always output the C<$message> argument in human-readable |
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170 | error messages (it's usually the same as C<"$!">). |
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171 | |
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172 | Non-fatal errors can be retried by simply returning, but it is recommended |
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173 | to simply ignore this parameter and instead abondon the handle object |
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174 | when this callback is invoked. Examples of non-fatal errors are timeouts |
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175 | C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>). |
93 | |
176 | |
94 | On callback entrance, the value of C<$!> contains the operating system |
177 | On callback entrance, the value of C<$!> contains the operating system |
95 | error (or C<ENOSPC>, C<EPIPE> or C<EBADMSG>). |
178 | error code (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT>, C<EBADMSG> or |
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179 | C<EPROTO>). |
96 | |
180 | |
97 | While not mandatory, it is I<highly> recommended to set this callback, as |
181 | While not mandatory, it is I<highly> recommended to set this callback, as |
98 | you will not be notified of errors otherwise. The default simply calls |
182 | you will not be notified of errors otherwise. The default simply calls |
99 | die. |
183 | C<croak>. |
100 | |
184 | |
101 | =item on_read => $cb->($self) |
185 | =item on_read => $cb->($handle) |
102 | |
186 | |
103 | This sets the default read callback, which is called when data arrives |
187 | This sets the default read callback, which is called when data arrives |
104 | and no read request is in the queue. |
188 | and no read request is in the queue (unlike read queue callbacks, this |
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189 | callback will only be called when at least one octet of data is in the |
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190 | read buffer). |
105 | |
191 | |
106 | To access (and remove data from) the read buffer, use the C<< ->rbuf >> |
192 | To access (and remove data from) the read buffer, use the C<< ->rbuf >> |
107 | method or access the C<$self->{rbuf}> member directly. |
193 | method or access the C<< $handle->{rbuf} >> member directly. Note that you |
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194 | must not enlarge or modify the read buffer, you can only remove data at |
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195 | the beginning from it. |
108 | |
196 | |
109 | When an EOF condition is detected then AnyEvent::Handle will first try to |
197 | When an EOF condition is detected then AnyEvent::Handle will first try to |
110 | feed all the remaining data to the queued callbacks and C<on_read> before |
198 | feed all the remaining data to the queued callbacks and C<on_read> before |
111 | calling the C<on_eof> callback. If no progress can be made, then a fatal |
199 | calling the C<on_eof> callback. If no progress can be made, then a fatal |
112 | error will be raised (with C<$!> set to C<EPIPE>). |
200 | error will be raised (with C<$!> set to C<EPIPE>). |
113 | |
201 | |
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202 | Note that, unlike requests in the read queue, an C<on_read> callback |
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203 | doesn't mean you I<require> some data: if there is an EOF and there |
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204 | are outstanding read requests then an error will be flagged. With an |
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205 | C<on_read> callback, the C<on_eof> callback will be invoked. |
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206 | |
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207 | =item on_eof => $cb->($handle) |
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208 | |
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209 | Set the callback to be called when an end-of-file condition is detected, |
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210 | i.e. in the case of a socket, when the other side has closed the |
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211 | connection cleanly, and there are no outstanding read requests in the |
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212 | queue (if there are read requests, then an EOF counts as an unexpected |
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213 | connection close and will be flagged as an error). |
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214 | |
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215 | For sockets, this just means that the other side has stopped sending data, |
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216 | you can still try to write data, and, in fact, one can return from the EOF |
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217 | callback and continue writing data, as only the read part has been shut |
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218 | down. |
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219 | |
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220 | If an EOF condition has been detected but no C<on_eof> callback has been |
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221 | set, then a fatal error will be raised with C<$!> set to <0>. |
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222 | |
114 | =item on_drain => $cb->() |
223 | =item on_drain => $cb->($handle) |
115 | |
224 | |
116 | This sets the callback that is called when the write buffer becomes empty |
225 | This sets the callback that is called when the write buffer becomes empty |
117 | (or when the callback is set and the buffer is empty already). |
226 | (or when the callback is set and the buffer is empty already). |
118 | |
227 | |
119 | To append to the write buffer, use the C<< ->push_write >> method. |
228 | To append to the write buffer, use the C<< ->push_write >> method. |
120 | |
229 | |
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230 | This callback is useful when you don't want to put all of your write data |
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231 | into the queue at once, for example, when you want to write the contents |
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232 | of some file to the socket you might not want to read the whole file into |
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233 | memory and push it into the queue, but instead only read more data from |
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234 | the file when the write queue becomes empty. |
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235 | |
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236 | =item timeout => $fractional_seconds |
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237 | |
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238 | =item rtimeout => $fractional_seconds |
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239 | |
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240 | =item wtimeout => $fractional_seconds |
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241 | |
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242 | If non-zero, then these enables an "inactivity" timeout: whenever this |
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243 | many seconds pass without a successful read or write on the underlying |
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244 | file handle (or a call to C<timeout_reset>), the C<on_timeout> callback |
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245 | will be invoked (and if that one is missing, a non-fatal C<ETIMEDOUT> |
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246 | error will be raised). |
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247 | |
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248 | There are three variants of the timeouts that work fully independent |
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249 | of each other, for both read and write, just read, and just write: |
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250 | C<timeout>, C<rtimeout> and C<wtimeout>, with corresponding callbacks |
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251 | C<on_timeout>, C<on_rtimeout> and C<on_wtimeout>, and reset functions |
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252 | C<timeout_reset>, C<rtimeout_reset>, and C<wtimeout_reset>. |
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253 | |
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254 | Note that timeout processing is also active when you currently do not have |
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255 | any outstanding read or write requests: If you plan to keep the connection |
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256 | idle then you should disable the timout temporarily or ignore the timeout |
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257 | in the C<on_timeout> callback, in which case AnyEvent::Handle will simply |
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258 | restart the timeout. |
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259 | |
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260 | Zero (the default) disables this timeout. |
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261 | |
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262 | =item on_timeout => $cb->($handle) |
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263 | |
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264 | Called whenever the inactivity timeout passes. If you return from this |
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265 | callback, then the timeout will be reset as if some activity had happened, |
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266 | so this condition is not fatal in any way. |
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267 | |
121 | =item rbuf_max => <bytes> |
268 | =item rbuf_max => <bytes> |
122 | |
269 | |
123 | If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>) |
270 | If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>) |
124 | when the read buffer ever (strictly) exceeds this size. This is useful to |
271 | when the read buffer ever (strictly) exceeds this size. This is useful to |
125 | avoid denial-of-service attacks. |
272 | avoid some forms of denial-of-service attacks. |
126 | |
273 | |
127 | For example, a server accepting connections from untrusted sources should |
274 | For example, a server accepting connections from untrusted sources should |
128 | be configured to accept only so-and-so much data that it cannot act on |
275 | be configured to accept only so-and-so much data that it cannot act on |
129 | (for example, when expecting a line, an attacker could send an unlimited |
276 | (for example, when expecting a line, an attacker could send an unlimited |
130 | amount of data without a callback ever being called as long as the line |
277 | amount of data without a callback ever being called as long as the line |
131 | isn't finished). |
278 | isn't finished). |
132 | |
279 | |
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280 | =item autocork => <boolean> |
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281 | |
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282 | When disabled (the default), then C<push_write> will try to immediately |
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283 | write the data to the handle, if possible. This avoids having to register |
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284 | a write watcher and wait for the next event loop iteration, but can |
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285 | be inefficient if you write multiple small chunks (on the wire, this |
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286 | disadvantage is usually avoided by your kernel's nagle algorithm, see |
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287 | C<no_delay>, but this option can save costly syscalls). |
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288 | |
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289 | When enabled, then writes will always be queued till the next event loop |
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290 | iteration. This is efficient when you do many small writes per iteration, |
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291 | but less efficient when you do a single write only per iteration (or when |
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292 | the write buffer often is full). It also increases write latency. |
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293 | |
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294 | =item no_delay => <boolean> |
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295 | |
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296 | When doing small writes on sockets, your operating system kernel might |
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297 | wait a bit for more data before actually sending it out. This is called |
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298 | the Nagle algorithm, and usually it is beneficial. |
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299 | |
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300 | In some situations you want as low a delay as possible, which can be |
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301 | accomplishd by setting this option to a true value. |
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302 | |
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303 | The default is your opertaing system's default behaviour (most likely |
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304 | enabled), this option explicitly enables or disables it, if possible. |
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305 | |
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306 | =item keepalive => <boolean> |
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307 | |
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308 | Enables (default disable) the SO_KEEPALIVE option on the stream socket: |
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309 | normally, TCP connections have no time-out once established, so TCP |
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310 | connections, once established, can stay alive forever even when the other |
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311 | side has long gone. TCP keepalives are a cheap way to take down long-lived |
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312 | TCP connections whent he other side becomes unreachable. While the default |
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313 | is OS-dependent, TCP keepalives usually kick in after around two hours, |
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314 | and, if the other side doesn't reply, take down the TCP connection some 10 |
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315 | to 15 minutes later. |
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316 | |
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317 | It is harmless to specify this option for file handles that do not support |
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318 | keepalives, and enabling it on connections that are potentially long-lived |
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319 | is usually a good idea. |
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320 | |
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321 | =item oobinline => <boolean> |
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322 | |
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323 | BSD majorly fucked up the implementation of TCP urgent data. The result |
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324 | is that almost no OS implements TCP according to the specs, and every OS |
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325 | implements it slightly differently. |
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326 | |
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327 | If you want to handle TCP urgent data, then setting this flag (the default |
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328 | is enabled) gives you the most portable way of getting urgent data, by |
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329 | putting it into the stream. |
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330 | |
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331 | Since BSD emulation of OOB data on top of TCP's urgent data can have |
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332 | security implications, AnyEvent::Handle sets this flag automatically |
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333 | unless explicitly specified. Note that setting this flag after |
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334 | establishing a connection I<may> be a bit too late (data loss could |
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335 | already have occured on BSD systems), but at least it will protect you |
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336 | from most attacks. |
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337 | |
133 | =item read_size => <bytes> |
338 | =item read_size => <bytes> |
134 | |
339 | |
135 | The default read block size (the amount of bytes this module will try to read |
340 | The default read block size (the amount of bytes this module will |
136 | on each [loop iteration). Default: C<4096>. |
341 | try to read during each loop iteration, which affects memory |
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342 | requirements). Default: C<8192>. |
137 | |
343 | |
138 | =item low_water_mark => <bytes> |
344 | =item low_water_mark => <bytes> |
139 | |
345 | |
140 | Sets the amount of bytes (default: C<0>) that make up an "empty" write |
346 | Sets the amount of bytes (default: C<0>) that make up an "empty" write |
141 | buffer: If the write reaches this size or gets even samller it is |
347 | buffer: If the write reaches this size or gets even samller it is |
142 | considered empty. |
348 | considered empty. |
143 | |
349 | |
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350 | Sometimes it can be beneficial (for performance reasons) to add data to |
|
|
351 | the write buffer before it is fully drained, but this is a rare case, as |
|
|
352 | the operating system kernel usually buffers data as well, so the default |
|
|
353 | is good in almost all cases. |
|
|
354 | |
|
|
355 | =item linger => <seconds> |
|
|
356 | |
|
|
357 | If non-zero (default: C<3600>), then the destructor of the |
|
|
358 | AnyEvent::Handle object will check whether there is still outstanding |
|
|
359 | write data and will install a watcher that will write this data to the |
|
|
360 | socket. No errors will be reported (this mostly matches how the operating |
|
|
361 | system treats outstanding data at socket close time). |
|
|
362 | |
|
|
363 | This will not work for partial TLS data that could not be encoded |
|
|
364 | yet. This data will be lost. Calling the C<stoptls> method in time might |
|
|
365 | help. |
|
|
366 | |
|
|
367 | =item peername => $string |
|
|
368 | |
|
|
369 | A string used to identify the remote site - usually the DNS hostname |
|
|
370 | (I<not> IDN!) used to create the connection, rarely the IP address. |
|
|
371 | |
|
|
372 | Apart from being useful in error messages, this string is also used in TLS |
|
|
373 | peername verification (see C<verify_peername> in L<AnyEvent::TLS>). This |
|
|
374 | verification will be skipped when C<peername> is not specified or |
|
|
375 | C<undef>. |
|
|
376 | |
144 | =item tls => "accept" | "connect" | Net::SSLeay::SSL object |
377 | =item tls => "accept" | "connect" | Net::SSLeay::SSL object |
145 | |
378 | |
146 | When this parameter is given, it enables TLS (SSL) mode, that means it |
379 | When this parameter is given, it enables TLS (SSL) mode, that means |
147 | will start making tls handshake and will transparently encrypt/decrypt |
380 | AnyEvent will start a TLS handshake as soon as the connection has been |
148 | data. |
381 | established and will transparently encrypt/decrypt data afterwards. |
|
|
382 | |
|
|
383 | All TLS protocol errors will be signalled as C<EPROTO>, with an |
|
|
384 | appropriate error message. |
149 | |
385 | |
150 | TLS mode requires Net::SSLeay to be installed (it will be loaded |
386 | TLS mode requires Net::SSLeay to be installed (it will be loaded |
151 | automatically when you try to create a TLS handle). |
387 | automatically when you try to create a TLS handle): this module doesn't |
|
|
388 | have a dependency on that module, so if your module requires it, you have |
|
|
389 | to add the dependency yourself. |
152 | |
390 | |
153 | For the TLS server side, use C<accept>, and for the TLS client side of a |
391 | Unlike TCP, TLS has a server and client side: for the TLS server side, use |
154 | connection, use C<connect> mode. |
392 | C<accept>, and for the TLS client side of a connection, use C<connect> |
|
|
393 | mode. |
155 | |
394 | |
156 | You can also provide your own TLS connection object, but you have |
395 | You can also provide your own TLS connection object, but you have |
157 | to make sure that you call either C<Net::SSLeay::set_connect_state> |
396 | to make sure that you call either C<Net::SSLeay::set_connect_state> |
158 | or C<Net::SSLeay::set_accept_state> on it before you pass it to |
397 | or C<Net::SSLeay::set_accept_state> on it before you pass it to |
159 | AnyEvent::Handle. |
398 | AnyEvent::Handle. Also, this module will take ownership of this connection |
|
|
399 | object. |
160 | |
400 | |
|
|
401 | At some future point, AnyEvent::Handle might switch to another TLS |
|
|
402 | implementation, then the option to use your own session object will go |
|
|
403 | away. |
|
|
404 | |
|
|
405 | B<IMPORTANT:> since Net::SSLeay "objects" are really only integers, |
|
|
406 | passing in the wrong integer will lead to certain crash. This most often |
|
|
407 | happens when one uses a stylish C<< tls => 1 >> and is surprised about the |
|
|
408 | segmentation fault. |
|
|
409 | |
161 | See the C<starttls> method if you need to start TLs negotiation later. |
410 | See the C<< ->starttls >> method for when need to start TLS negotiation later. |
162 | |
411 | |
163 | =item tls_ctx => $ssl_ctx |
412 | =item tls_ctx => $anyevent_tls |
164 | |
413 | |
165 | Use the given Net::SSLeay::CTX object to create the new TLS connection |
414 | Use the given C<AnyEvent::TLS> object to create the new TLS connection |
166 | (unless a connection object was specified directly). If this parameter is |
415 | (unless a connection object was specified directly). If this parameter is |
167 | missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>. |
416 | missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>. |
168 | |
417 | |
|
|
418 | Instead of an object, you can also specify a hash reference with C<< key |
|
|
419 | => value >> pairs. Those will be passed to L<AnyEvent::TLS> to create a |
|
|
420 | new TLS context object. |
|
|
421 | |
|
|
422 | =item on_starttls => $cb->($handle, $success[, $error_message]) |
|
|
423 | |
|
|
424 | This callback will be invoked when the TLS/SSL handshake has finished. If |
|
|
425 | C<$success> is true, then the TLS handshake succeeded, otherwise it failed |
|
|
426 | (C<on_stoptls> will not be called in this case). |
|
|
427 | |
|
|
428 | The session in C<< $handle->{tls} >> can still be examined in this |
|
|
429 | callback, even when the handshake was not successful. |
|
|
430 | |
|
|
431 | TLS handshake failures will not cause C<on_error> to be invoked when this |
|
|
432 | callback is in effect, instead, the error message will be passed to C<on_starttls>. |
|
|
433 | |
|
|
434 | Without this callback, handshake failures lead to C<on_error> being |
|
|
435 | called, as normal. |
|
|
436 | |
|
|
437 | Note that you cannot call C<starttls> right again in this callback. If you |
|
|
438 | need to do that, start an zero-second timer instead whose callback can |
|
|
439 | then call C<< ->starttls >> again. |
|
|
440 | |
|
|
441 | =item on_stoptls => $cb->($handle) |
|
|
442 | |
|
|
443 | When a SSLv3/TLS shutdown/close notify/EOF is detected and this callback is |
|
|
444 | set, then it will be invoked after freeing the TLS session. If it is not, |
|
|
445 | then a TLS shutdown condition will be treated like a normal EOF condition |
|
|
446 | on the handle. |
|
|
447 | |
|
|
448 | The session in C<< $handle->{tls} >> can still be examined in this |
|
|
449 | callback. |
|
|
450 | |
|
|
451 | This callback will only be called on TLS shutdowns, not when the |
|
|
452 | underlying handle signals EOF. |
|
|
453 | |
|
|
454 | =item json => JSON or JSON::XS object |
|
|
455 | |
|
|
456 | This is the json coder object used by the C<json> read and write types. |
|
|
457 | |
|
|
458 | If you don't supply it, then AnyEvent::Handle will create and use a |
|
|
459 | suitable one (on demand), which will write and expect UTF-8 encoded JSON |
|
|
460 | texts. |
|
|
461 | |
|
|
462 | Note that you are responsible to depend on the JSON module if you want to |
|
|
463 | use this functionality, as AnyEvent does not have a dependency itself. |
|
|
464 | |
169 | =back |
465 | =back |
170 | |
466 | |
171 | =cut |
467 | =cut |
172 | |
|
|
173 | our (%RH, %WH); |
|
|
174 | |
|
|
175 | sub register_read_type($$) { |
|
|
176 | $RH{$_[0]} = $_[1]; |
|
|
177 | } |
|
|
178 | |
|
|
179 | sub register_write_type($$) { |
|
|
180 | $WH{$_[0]} = $_[1]; |
|
|
181 | } |
|
|
182 | |
468 | |
183 | sub new { |
469 | sub new { |
184 | my $class = shift; |
470 | my $class = shift; |
185 | |
|
|
186 | my $self = bless { @_ }, $class; |
471 | my $self = bless { @_ }, $class; |
187 | |
472 | |
188 | $self->{fh} or Carp::croak "mandatory argument fh is missing"; |
473 | if ($self->{fh}) { |
|
|
474 | $self->_start; |
|
|
475 | return unless $self->{fh}; # could be gone by now |
|
|
476 | |
|
|
477 | } elsif ($self->{connect}) { |
|
|
478 | require AnyEvent::Socket; |
|
|
479 | |
|
|
480 | $self->{peername} = $self->{connect}[0] |
|
|
481 | unless exists $self->{peername}; |
|
|
482 | |
|
|
483 | $self->{_skip_drain_rbuf} = 1; |
|
|
484 | |
|
|
485 | { |
|
|
486 | Scalar::Util::weaken (my $self = $self); |
|
|
487 | |
|
|
488 | $self->{_connect} = |
|
|
489 | AnyEvent::Socket::tcp_connect ( |
|
|
490 | $self->{connect}[0], |
|
|
491 | $self->{connect}[1], |
|
|
492 | sub { |
|
|
493 | my ($fh, $host, $port, $retry) = @_; |
|
|
494 | |
|
|
495 | if ($fh) { |
|
|
496 | $self->{fh} = $fh; |
|
|
497 | |
|
|
498 | delete $self->{_skip_drain_rbuf}; |
|
|
499 | $self->_start; |
|
|
500 | |
|
|
501 | $self->{on_connect} |
|
|
502 | and $self->{on_connect}($self, $host, $port, sub { |
|
|
503 | delete @$self{qw(fh _tw _rtw _wtw _ww _rw _eof _queue rbuf _wbuf tls _tls_rbuf _tls_wbuf)}; |
|
|
504 | $self->{_skip_drain_rbuf} = 1; |
|
|
505 | &$retry; |
|
|
506 | }); |
|
|
507 | |
|
|
508 | } else { |
|
|
509 | if ($self->{on_connect_error}) { |
|
|
510 | $self->{on_connect_error}($self, "$!"); |
|
|
511 | $self->destroy; |
|
|
512 | } else { |
|
|
513 | $self->_error ($!, 1); |
|
|
514 | } |
|
|
515 | } |
|
|
516 | }, |
|
|
517 | sub { |
|
|
518 | local $self->{fh} = $_[0]; |
|
|
519 | |
|
|
520 | $self->{on_prepare} |
|
|
521 | ? $self->{on_prepare}->($self) |
|
|
522 | : () |
|
|
523 | } |
|
|
524 | ); |
|
|
525 | } |
|
|
526 | |
|
|
527 | } else { |
|
|
528 | Carp::croak "AnyEvent::Handle: either an existing fh or the connect parameter must be specified"; |
|
|
529 | } |
|
|
530 | |
|
|
531 | $self |
|
|
532 | } |
|
|
533 | |
|
|
534 | sub _start { |
|
|
535 | my ($self) = @_; |
189 | |
536 | |
190 | AnyEvent::Util::fh_nonblocking $self->{fh}, 1; |
537 | AnyEvent::Util::fh_nonblocking $self->{fh}, 1; |
191 | |
538 | |
192 | if ($self->{tls}) { |
539 | $self->{_activity} = |
193 | require Net::SSLeay; |
540 | $self->{_ractivity} = |
|
|
541 | $self->{_wactivity} = AE::now; |
|
|
542 | |
|
|
543 | $self->timeout (delete $self->{timeout} ) if $self->{timeout}; |
|
|
544 | $self->rtimeout (delete $self->{rtimeout} ) if $self->{rtimeout}; |
|
|
545 | $self->wtimeout (delete $self->{wtimeout} ) if $self->{wtimeout}; |
|
|
546 | |
|
|
547 | $self->no_delay (delete $self->{no_delay} ) if exists $self->{no_delay} && $self->{no_delay}; |
|
|
548 | $self->keepalive (delete $self->{keepalive}) if exists $self->{keepalive} && $self->{keepalive}; |
|
|
549 | |
|
|
550 | $self->oobinline (exists $self->{oobinline} ? delete $self->{oobinline} : 1); |
|
|
551 | |
194 | $self->starttls (delete $self->{tls}, delete $self->{tls_ctx}); |
552 | $self->starttls (delete $self->{tls}, delete $self->{tls_ctx}) |
195 | } |
553 | if $self->{tls}; |
196 | |
554 | |
197 | $self->on_eof (delete $self->{on_eof} ) if $self->{on_eof}; |
|
|
198 | $self->on_error (delete $self->{on_error}) if $self->{on_error}; |
|
|
199 | $self->on_drain (delete $self->{on_drain}) if $self->{on_drain}; |
555 | $self->on_drain (delete $self->{on_drain}) if $self->{on_drain}; |
200 | $self->on_read (delete $self->{on_read} ) if $self->{on_read}; |
|
|
201 | |
556 | |
202 | $self->start_read; |
557 | $self->start_read |
|
|
558 | if $self->{on_read} || @{ $self->{_queue} }; |
203 | |
559 | |
204 | $self |
560 | $self->_drain_wbuf; |
205 | } |
561 | } |
206 | |
562 | |
207 | sub _shutdown { |
|
|
208 | my ($self) = @_; |
|
|
209 | |
|
|
210 | delete $self->{rw}; |
|
|
211 | delete $self->{ww}; |
|
|
212 | delete $self->{fh}; |
|
|
213 | } |
|
|
214 | |
|
|
215 | sub error { |
563 | sub _error { |
216 | my ($self) = @_; |
564 | my ($self, $errno, $fatal, $message) = @_; |
217 | |
565 | |
218 | { |
566 | $! = $errno; |
219 | local $!; |
567 | $message ||= "$!"; |
220 | $self->_shutdown; |
|
|
221 | } |
|
|
222 | |
568 | |
223 | if ($self->{on_error}) { |
569 | if ($self->{on_error}) { |
224 | $self->{on_error}($self); |
570 | $self->{on_error}($self, $fatal, $message); |
225 | } else { |
571 | $self->destroy if $fatal; |
|
|
572 | } elsif ($self->{fh} || $self->{connect}) { |
|
|
573 | $self->destroy; |
226 | Carp::croak "AnyEvent::Handle uncaught fatal error: $!"; |
574 | Carp::croak "AnyEvent::Handle uncaught error: $message"; |
227 | } |
575 | } |
228 | } |
576 | } |
229 | |
577 | |
230 | =item $fh = $handle->fh |
578 | =item $fh = $handle->fh |
231 | |
579 | |
232 | This method returns the file handle of the L<AnyEvent::Handle> object. |
580 | This method returns the file handle used to create the L<AnyEvent::Handle> object. |
233 | |
581 | |
234 | =cut |
582 | =cut |
235 | |
583 | |
236 | sub fh { $_[0]->{fh} } |
584 | sub fh { $_[0]{fh} } |
237 | |
585 | |
238 | =item $handle->on_error ($cb) |
586 | =item $handle->on_error ($cb) |
239 | |
587 | |
240 | Replace the current C<on_error> callback (see the C<on_error> constructor argument). |
588 | Replace the current C<on_error> callback (see the C<on_error> constructor argument). |
241 | |
589 | |
… | |
… | |
253 | |
601 | |
254 | sub on_eof { |
602 | sub on_eof { |
255 | $_[0]{on_eof} = $_[1]; |
603 | $_[0]{on_eof} = $_[1]; |
256 | } |
604 | } |
257 | |
605 | |
|
|
606 | =item $handle->on_timeout ($cb) |
|
|
607 | |
|
|
608 | =item $handle->on_rtimeout ($cb) |
|
|
609 | |
|
|
610 | =item $handle->on_wtimeout ($cb) |
|
|
611 | |
|
|
612 | Replace the current C<on_timeout>, C<on_rtimeout> or C<on_wtimeout> |
|
|
613 | callback, or disables the callback (but not the timeout) if C<$cb> = |
|
|
614 | C<undef>. See the C<timeout> constructor argument and method. |
|
|
615 | |
|
|
616 | =cut |
|
|
617 | |
|
|
618 | # see below |
|
|
619 | |
|
|
620 | =item $handle->autocork ($boolean) |
|
|
621 | |
|
|
622 | Enables or disables the current autocork behaviour (see C<autocork> |
|
|
623 | constructor argument). Changes will only take effect on the next write. |
|
|
624 | |
|
|
625 | =cut |
|
|
626 | |
|
|
627 | sub autocork { |
|
|
628 | $_[0]{autocork} = $_[1]; |
|
|
629 | } |
|
|
630 | |
|
|
631 | =item $handle->no_delay ($boolean) |
|
|
632 | |
|
|
633 | Enables or disables the C<no_delay> setting (see constructor argument of |
|
|
634 | the same name for details). |
|
|
635 | |
|
|
636 | =cut |
|
|
637 | |
|
|
638 | sub no_delay { |
|
|
639 | $_[0]{no_delay} = $_[1]; |
|
|
640 | |
|
|
641 | eval { |
|
|
642 | local $SIG{__DIE__}; |
|
|
643 | setsockopt $_[0]{fh}, Socket::IPPROTO_TCP (), Socket::TCP_NODELAY (), int $_[1] |
|
|
644 | if $_[0]{fh}; |
|
|
645 | }; |
|
|
646 | } |
|
|
647 | |
|
|
648 | =item $handle->keepalive ($boolean) |
|
|
649 | |
|
|
650 | Enables or disables the C<keepalive> setting (see constructor argument of |
|
|
651 | the same name for details). |
|
|
652 | |
|
|
653 | =cut |
|
|
654 | |
|
|
655 | sub keepalive { |
|
|
656 | $_[0]{keepalive} = $_[1]; |
|
|
657 | |
|
|
658 | eval { |
|
|
659 | local $SIG{__DIE__}; |
|
|
660 | setsockopt $_[0]{fh}, Socket::SOL_SOCKET (), Socket::SO_KEEPALIVE (), int $_[1] |
|
|
661 | if $_[0]{fh}; |
|
|
662 | }; |
|
|
663 | } |
|
|
664 | |
|
|
665 | =item $handle->oobinline ($boolean) |
|
|
666 | |
|
|
667 | Enables or disables the C<oobinline> setting (see constructor argument of |
|
|
668 | the same name for details). |
|
|
669 | |
|
|
670 | =cut |
|
|
671 | |
|
|
672 | sub oobinline { |
|
|
673 | $_[0]{oobinline} = $_[1]; |
|
|
674 | |
|
|
675 | eval { |
|
|
676 | local $SIG{__DIE__}; |
|
|
677 | setsockopt $_[0]{fh}, Socket::SOL_SOCKET (), Socket::SO_OOBINLINE (), int $_[1] |
|
|
678 | if $_[0]{fh}; |
|
|
679 | }; |
|
|
680 | } |
|
|
681 | |
|
|
682 | =item $handle->keepalive ($boolean) |
|
|
683 | |
|
|
684 | Enables or disables the C<keepalive> setting (see constructor argument of |
|
|
685 | the same name for details). |
|
|
686 | |
|
|
687 | =cut |
|
|
688 | |
|
|
689 | sub keepalive { |
|
|
690 | $_[0]{keepalive} = $_[1]; |
|
|
691 | |
|
|
692 | eval { |
|
|
693 | local $SIG{__DIE__}; |
|
|
694 | setsockopt $_[0]{fh}, Socket::SOL_SOCKET (), Socket::SO_KEEPALIVE (), int $_[1] |
|
|
695 | if $_[0]{fh}; |
|
|
696 | }; |
|
|
697 | } |
|
|
698 | |
|
|
699 | =item $handle->on_starttls ($cb) |
|
|
700 | |
|
|
701 | Replace the current C<on_starttls> callback (see the C<on_starttls> constructor argument). |
|
|
702 | |
|
|
703 | =cut |
|
|
704 | |
|
|
705 | sub on_starttls { |
|
|
706 | $_[0]{on_starttls} = $_[1]; |
|
|
707 | } |
|
|
708 | |
|
|
709 | =item $handle->on_stoptls ($cb) |
|
|
710 | |
|
|
711 | Replace the current C<on_stoptls> callback (see the C<on_stoptls> constructor argument). |
|
|
712 | |
|
|
713 | =cut |
|
|
714 | |
|
|
715 | sub on_stoptls { |
|
|
716 | $_[0]{on_stoptls} = $_[1]; |
|
|
717 | } |
|
|
718 | |
|
|
719 | =item $handle->rbuf_max ($max_octets) |
|
|
720 | |
|
|
721 | Configures the C<rbuf_max> setting (C<undef> disables it). |
|
|
722 | |
|
|
723 | =cut |
|
|
724 | |
|
|
725 | sub rbuf_max { |
|
|
726 | $_[0]{rbuf_max} = $_[1]; |
|
|
727 | } |
|
|
728 | |
|
|
729 | ############################################################################# |
|
|
730 | |
|
|
731 | =item $handle->timeout ($seconds) |
|
|
732 | |
|
|
733 | =item $handle->rtimeout ($seconds) |
|
|
734 | |
|
|
735 | =item $handle->wtimeout ($seconds) |
|
|
736 | |
|
|
737 | Configures (or disables) the inactivity timeout. |
|
|
738 | |
|
|
739 | =item $handle->timeout_reset |
|
|
740 | |
|
|
741 | =item $handle->rtimeout_reset |
|
|
742 | |
|
|
743 | =item $handle->wtimeout_reset |
|
|
744 | |
|
|
745 | Reset the activity timeout, as if data was received or sent. |
|
|
746 | |
|
|
747 | These methods are cheap to call. |
|
|
748 | |
|
|
749 | =cut |
|
|
750 | |
|
|
751 | for my $dir ("", "r", "w") { |
|
|
752 | my $timeout = "${dir}timeout"; |
|
|
753 | my $tw = "_${dir}tw"; |
|
|
754 | my $on_timeout = "on_${dir}timeout"; |
|
|
755 | my $activity = "_${dir}activity"; |
|
|
756 | my $cb; |
|
|
757 | |
|
|
758 | *$on_timeout = sub { |
|
|
759 | $_[0]{$on_timeout} = $_[1]; |
|
|
760 | }; |
|
|
761 | |
|
|
762 | *$timeout = sub { |
|
|
763 | my ($self, $new_value) = @_; |
|
|
764 | |
|
|
765 | $self->{$timeout} = $new_value; |
|
|
766 | delete $self->{$tw}; &$cb; |
|
|
767 | }; |
|
|
768 | |
|
|
769 | *{"${dir}timeout_reset"} = sub { |
|
|
770 | $_[0]{$activity} = AE::now; |
|
|
771 | }; |
|
|
772 | |
|
|
773 | # main workhorse: |
|
|
774 | # reset the timeout watcher, as neccessary |
|
|
775 | # also check for time-outs |
|
|
776 | $cb = sub { |
|
|
777 | my ($self) = @_; |
|
|
778 | |
|
|
779 | if ($self->{$timeout} && $self->{fh}) { |
|
|
780 | my $NOW = AE::now; |
|
|
781 | |
|
|
782 | # when would the timeout trigger? |
|
|
783 | my $after = $self->{$activity} + $self->{$timeout} - $NOW; |
|
|
784 | |
|
|
785 | # now or in the past already? |
|
|
786 | if ($after <= 0) { |
|
|
787 | $self->{$activity} = $NOW; |
|
|
788 | |
|
|
789 | if ($self->{$on_timeout}) { |
|
|
790 | $self->{$on_timeout}($self); |
|
|
791 | } else { |
|
|
792 | $self->_error (Errno::ETIMEDOUT); |
|
|
793 | } |
|
|
794 | |
|
|
795 | # callback could have changed timeout value, optimise |
|
|
796 | return unless $self->{$timeout}; |
|
|
797 | |
|
|
798 | # calculate new after |
|
|
799 | $after = $self->{$timeout}; |
|
|
800 | } |
|
|
801 | |
|
|
802 | Scalar::Util::weaken $self; |
|
|
803 | return unless $self; # ->error could have destroyed $self |
|
|
804 | |
|
|
805 | $self->{$tw} ||= AE::timer $after, 0, sub { |
|
|
806 | delete $self->{$tw}; |
|
|
807 | $cb->($self); |
|
|
808 | }; |
|
|
809 | } else { |
|
|
810 | delete $self->{$tw}; |
|
|
811 | } |
|
|
812 | } |
|
|
813 | } |
|
|
814 | |
258 | ############################################################################# |
815 | ############################################################################# |
259 | |
816 | |
260 | =back |
817 | =back |
261 | |
818 | |
262 | =head2 WRITE QUEUE |
819 | =head2 WRITE QUEUE |
… | |
… | |
275 | =item $handle->on_drain ($cb) |
832 | =item $handle->on_drain ($cb) |
276 | |
833 | |
277 | Sets the C<on_drain> callback or clears it (see the description of |
834 | Sets the C<on_drain> callback or clears it (see the description of |
278 | C<on_drain> in the constructor). |
835 | C<on_drain> in the constructor). |
279 | |
836 | |
|
|
837 | This method may invoke callbacks (and therefore the handle might be |
|
|
838 | destroyed after it returns). |
|
|
839 | |
280 | =cut |
840 | =cut |
281 | |
841 | |
282 | sub on_drain { |
842 | sub on_drain { |
283 | my ($self, $cb) = @_; |
843 | my ($self, $cb) = @_; |
284 | |
844 | |
285 | $self->{on_drain} = $cb; |
845 | $self->{on_drain} = $cb; |
286 | |
846 | |
287 | $cb->($self) |
847 | $cb->($self) |
288 | if $cb && $self->{low_water_mark} >= length $self->{wbuf}; |
848 | if $cb && $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf}); |
289 | } |
849 | } |
290 | |
850 | |
291 | =item $handle->push_write ($data) |
851 | =item $handle->push_write ($data) |
292 | |
852 | |
293 | Queues the given scalar to be written. You can push as much data as you |
853 | Queues the given scalar to be written. You can push as much data as you |
294 | want (only limited by the available memory), as C<AnyEvent::Handle> |
854 | want (only limited by the available memory), as C<AnyEvent::Handle> |
295 | buffers it independently of the kernel. |
855 | buffers it independently of the kernel. |
296 | |
856 | |
|
|
857 | This method may invoke callbacks (and therefore the handle might be |
|
|
858 | destroyed after it returns). |
|
|
859 | |
297 | =cut |
860 | =cut |
298 | |
861 | |
299 | sub _drain_wbuf { |
862 | sub _drain_wbuf { |
300 | my ($self) = @_; |
863 | my ($self) = @_; |
301 | |
864 | |
302 | if (!$self->{ww} && length $self->{wbuf}) { |
865 | if (!$self->{_ww} && length $self->{wbuf}) { |
|
|
866 | |
303 | Scalar::Util::weaken $self; |
867 | Scalar::Util::weaken $self; |
|
|
868 | |
304 | my $cb = sub { |
869 | my $cb = sub { |
305 | my $len = syswrite $self->{fh}, $self->{wbuf}; |
870 | my $len = syswrite $self->{fh}, $self->{wbuf}; |
306 | |
871 | |
307 | if ($len >= 0) { |
872 | if (defined $len) { |
308 | substr $self->{wbuf}, 0, $len, ""; |
873 | substr $self->{wbuf}, 0, $len, ""; |
309 | |
874 | |
|
|
875 | $self->{_activity} = $self->{_wactivity} = AE::now; |
|
|
876 | |
310 | $self->{on_drain}($self) |
877 | $self->{on_drain}($self) |
311 | if $self->{low_water_mark} >= length $self->{wbuf} |
878 | if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf}) |
312 | && $self->{on_drain}; |
879 | && $self->{on_drain}; |
313 | |
880 | |
314 | delete $self->{ww} unless length $self->{wbuf}; |
881 | delete $self->{_ww} unless length $self->{wbuf}; |
315 | } elsif ($! != EAGAIN && $! != EINTR) { |
882 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) { |
316 | $self->error; |
883 | $self->_error ($!, 1); |
317 | } |
884 | } |
318 | }; |
885 | }; |
319 | |
886 | |
320 | $self->{ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb); |
887 | # try to write data immediately |
|
|
888 | $cb->() unless $self->{autocork}; |
321 | |
889 | |
322 | $cb->($self); |
890 | # if still data left in wbuf, we need to poll |
|
|
891 | $self->{_ww} = AE::io $self->{fh}, 1, $cb |
|
|
892 | if length $self->{wbuf}; |
323 | }; |
893 | }; |
|
|
894 | } |
|
|
895 | |
|
|
896 | our %WH; |
|
|
897 | |
|
|
898 | # deprecated |
|
|
899 | sub register_write_type($$) { |
|
|
900 | $WH{$_[0]} = $_[1]; |
324 | } |
901 | } |
325 | |
902 | |
326 | sub push_write { |
903 | sub push_write { |
327 | my $self = shift; |
904 | my $self = shift; |
328 | |
905 | |
329 | if (@_ > 1) { |
906 | if (@_ > 1) { |
330 | my $type = shift; |
907 | my $type = shift; |
331 | |
908 | |
|
|
909 | @_ = ($WH{$type} ||= _load_func "$type\::anyevent_write_type" |
332 | @_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write") |
910 | or Carp::croak "unsupported/unloadable type '$type' passed to AnyEvent::Handle::push_write") |
333 | ->($self, @_); |
911 | ->($self, @_); |
334 | } |
912 | } |
335 | |
913 | |
|
|
914 | # we downgrade here to avoid hard-to-track-down bugs, |
|
|
915 | # and diagnose the problem earlier and better. |
|
|
916 | |
336 | if ($self->{filter_w}) { |
917 | if ($self->{tls}) { |
337 | $self->{filter_w}->($self, \$_[0]); |
918 | utf8::downgrade $self->{_tls_wbuf} .= $_[0]; |
|
|
919 | &_dotls ($self) if $self->{fh}; |
338 | } else { |
920 | } else { |
339 | $self->{wbuf} .= $_[0]; |
921 | utf8::downgrade $self->{wbuf} .= $_[0]; |
340 | $self->_drain_wbuf; |
922 | $self->_drain_wbuf if $self->{fh}; |
341 | } |
923 | } |
342 | } |
924 | } |
343 | |
925 | |
344 | =item $handle->push_write (type => @args) |
926 | =item $handle->push_write (type => @args) |
345 | |
927 | |
346 | =item $handle->unshift_write (type => @args) |
|
|
347 | |
|
|
348 | Instead of formatting your data yourself, you can also let this module do |
928 | Instead of formatting your data yourself, you can also let this module |
349 | the job by specifying a type and type-specific arguments. |
929 | do the job by specifying a type and type-specific arguments. You |
|
|
930 | can also specify the (fully qualified) name of a package, in which |
|
|
931 | case AnyEvent tries to load the package and then expects to find the |
|
|
932 | C<anyevent_read_type> function inside (see "custom write types", below). |
350 | |
933 | |
351 | Predefined types are: |
934 | Predefined types are (if you have ideas for additional types, feel free to |
|
|
935 | drop by and tell us): |
352 | |
936 | |
353 | =over 4 |
937 | =over 4 |
354 | |
938 | |
355 | =item netstring => $string |
939 | =item netstring => $string |
356 | |
940 | |
… | |
… | |
360 | =cut |
944 | =cut |
361 | |
945 | |
362 | register_write_type netstring => sub { |
946 | register_write_type netstring => sub { |
363 | my ($self, $string) = @_; |
947 | my ($self, $string) = @_; |
364 | |
948 | |
365 | sprintf "%d:%s,", (length $string), $string |
949 | (length $string) . ":$string," |
366 | }; |
950 | }; |
367 | |
951 | |
|
|
952 | =item packstring => $format, $data |
|
|
953 | |
|
|
954 | An octet string prefixed with an encoded length. The encoding C<$format> |
|
|
955 | uses the same format as a Perl C<pack> format, but must specify a single |
|
|
956 | integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an |
|
|
957 | optional C<!>, C<< < >> or C<< > >> modifier). |
|
|
958 | |
|
|
959 | =cut |
|
|
960 | |
|
|
961 | register_write_type packstring => sub { |
|
|
962 | my ($self, $format, $string) = @_; |
|
|
963 | |
|
|
964 | pack "$format/a*", $string |
|
|
965 | }; |
|
|
966 | |
|
|
967 | =item json => $array_or_hashref |
|
|
968 | |
|
|
969 | Encodes the given hash or array reference into a JSON object. Unless you |
|
|
970 | provide your own JSON object, this means it will be encoded to JSON text |
|
|
971 | in UTF-8. |
|
|
972 | |
|
|
973 | JSON objects (and arrays) are self-delimiting, so you can write JSON at |
|
|
974 | one end of a handle and read them at the other end without using any |
|
|
975 | additional framing. |
|
|
976 | |
|
|
977 | The generated JSON text is guaranteed not to contain any newlines: While |
|
|
978 | this module doesn't need delimiters after or between JSON texts to be |
|
|
979 | able to read them, many other languages depend on that. |
|
|
980 | |
|
|
981 | A simple RPC protocol that interoperates easily with others is to send |
|
|
982 | JSON arrays (or objects, although arrays are usually the better choice as |
|
|
983 | they mimic how function argument passing works) and a newline after each |
|
|
984 | JSON text: |
|
|
985 | |
|
|
986 | $handle->push_write (json => ["method", "arg1", "arg2"]); # whatever |
|
|
987 | $handle->push_write ("\012"); |
|
|
988 | |
|
|
989 | An AnyEvent::Handle receiver would simply use the C<json> read type and |
|
|
990 | rely on the fact that the newline will be skipped as leading whitespace: |
|
|
991 | |
|
|
992 | $handle->push_read (json => sub { my $array = $_[1]; ... }); |
|
|
993 | |
|
|
994 | Other languages could read single lines terminated by a newline and pass |
|
|
995 | this line into their JSON decoder of choice. |
|
|
996 | |
|
|
997 | =cut |
|
|
998 | |
|
|
999 | sub json_coder() { |
|
|
1000 | eval { require JSON::XS; JSON::XS->new->utf8 } |
|
|
1001 | || do { require JSON; JSON->new->utf8 } |
|
|
1002 | } |
|
|
1003 | |
|
|
1004 | register_write_type json => sub { |
|
|
1005 | my ($self, $ref) = @_; |
|
|
1006 | |
|
|
1007 | my $json = $self->{json} ||= json_coder; |
|
|
1008 | |
|
|
1009 | $json->encode ($ref) |
|
|
1010 | }; |
|
|
1011 | |
|
|
1012 | =item storable => $reference |
|
|
1013 | |
|
|
1014 | Freezes the given reference using L<Storable> and writes it to the |
|
|
1015 | handle. Uses the C<nfreeze> format. |
|
|
1016 | |
|
|
1017 | =cut |
|
|
1018 | |
|
|
1019 | register_write_type storable => sub { |
|
|
1020 | my ($self, $ref) = @_; |
|
|
1021 | |
|
|
1022 | require Storable; |
|
|
1023 | |
|
|
1024 | pack "w/a*", Storable::nfreeze ($ref) |
|
|
1025 | }; |
|
|
1026 | |
368 | =back |
1027 | =back |
369 | |
1028 | |
370 | =cut |
1029 | =item $handle->push_shutdown |
371 | |
1030 | |
|
|
1031 | Sometimes you know you want to close the socket after writing your data |
|
|
1032 | before it was actually written. One way to do that is to replace your |
|
|
1033 | C<on_drain> handler by a callback that shuts down the socket (and set |
|
|
1034 | C<low_water_mark> to C<0>). This method is a shorthand for just that, and |
|
|
1035 | replaces the C<on_drain> callback with: |
372 | |
1036 | |
|
|
1037 | sub { shutdown $_[0]{fh}, 1 } # for push_shutdown |
|
|
1038 | |
|
|
1039 | This simply shuts down the write side and signals an EOF condition to the |
|
|
1040 | the peer. |
|
|
1041 | |
|
|
1042 | You can rely on the normal read queue and C<on_eof> handling |
|
|
1043 | afterwards. This is the cleanest way to close a connection. |
|
|
1044 | |
|
|
1045 | This method may invoke callbacks (and therefore the handle might be |
|
|
1046 | destroyed after it returns). |
|
|
1047 | |
|
|
1048 | =cut |
|
|
1049 | |
|
|
1050 | sub push_shutdown { |
|
|
1051 | my ($self) = @_; |
|
|
1052 | |
|
|
1053 | delete $self->{low_water_mark}; |
|
|
1054 | $self->on_drain (sub { shutdown $_[0]{fh}, 1 }); |
|
|
1055 | } |
|
|
1056 | |
|
|
1057 | =item custom write types - Package::anyevent_write_type $handle, @args |
|
|
1058 | |
|
|
1059 | Instead of one of the predefined types, you can also specify the name of |
|
|
1060 | a package. AnyEvent will try to load the package and then expects to find |
|
|
1061 | a function named C<anyevent_write_type> inside. If it isn't found, it |
|
|
1062 | progressively tries to load the parent package until it either finds the |
|
|
1063 | function (good) or runs out of packages (bad). |
|
|
1064 | |
|
|
1065 | Whenever the given C<type> is used, C<push_write> will the function with |
|
|
1066 | the handle object and the remaining arguments. |
|
|
1067 | |
|
|
1068 | The function is supposed to return a single octet string that will be |
|
|
1069 | appended to the write buffer, so you cna mentally treat this function as a |
|
|
1070 | "arguments to on-the-wire-format" converter. |
|
|
1071 | |
|
|
1072 | Example: implement a custom write type C<join> that joins the remaining |
|
|
1073 | arguments using the first one. |
|
|
1074 | |
|
|
1075 | $handle->push_write (My::Type => " ", 1,2,3); |
|
|
1076 | |
|
|
1077 | # uses the following package, which can be defined in the "My::Type" or in |
|
|
1078 | # the "My" modules to be auto-loaded, or just about anywhere when the |
|
|
1079 | # My::Type::anyevent_write_type is defined before invoking it. |
|
|
1080 | |
|
|
1081 | package My::Type; |
|
|
1082 | |
|
|
1083 | sub anyevent_write_type { |
|
|
1084 | my ($handle, $delim, @args) = @_; |
|
|
1085 | |
|
|
1086 | join $delim, @args |
|
|
1087 | } |
|
|
1088 | |
|
|
1089 | =cut |
373 | |
1090 | |
374 | ############################################################################# |
1091 | ############################################################################# |
375 | |
1092 | |
376 | =back |
1093 | =back |
377 | |
1094 | |
… | |
… | |
384 | ways, the "simple" way, using only C<on_read> and the "complex" way, using |
1101 | ways, the "simple" way, using only C<on_read> and the "complex" way, using |
385 | a queue. |
1102 | a queue. |
386 | |
1103 | |
387 | In the simple case, you just install an C<on_read> callback and whenever |
1104 | In the simple case, you just install an C<on_read> callback and whenever |
388 | new data arrives, it will be called. You can then remove some data (if |
1105 | new data arrives, it will be called. You can then remove some data (if |
389 | enough is there) from the read buffer (C<< $handle->rbuf >>) if you want |
1106 | enough is there) from the read buffer (C<< $handle->rbuf >>). Or you cna |
390 | or not. |
1107 | leave the data there if you want to accumulate more (e.g. when only a |
|
|
1108 | partial message has been received so far). |
391 | |
1109 | |
392 | In the more complex case, you want to queue multiple callbacks. In this |
1110 | In the more complex case, you want to queue multiple callbacks. In this |
393 | case, AnyEvent::Handle will call the first queued callback each time new |
1111 | case, AnyEvent::Handle will call the first queued callback each time new |
394 | data arrives and removes it when it has done its job (see C<push_read>, |
1112 | data arrives (also the first time it is queued) and removes it when it has |
395 | below). |
1113 | done its job (see C<push_read>, below). |
396 | |
1114 | |
397 | This way you can, for example, push three line-reads, followed by reading |
1115 | This way you can, for example, push three line-reads, followed by reading |
398 | a chunk of data, and AnyEvent::Handle will execute them in order. |
1116 | a chunk of data, and AnyEvent::Handle will execute them in order. |
399 | |
1117 | |
400 | Example 1: EPP protocol parser. EPP sends 4 byte length info, followed by |
1118 | Example 1: EPP protocol parser. EPP sends 4 byte length info, followed by |
401 | the specified number of bytes which give an XML datagram. |
1119 | the specified number of bytes which give an XML datagram. |
402 | |
1120 | |
403 | # in the default state, expect some header bytes |
1121 | # in the default state, expect some header bytes |
404 | $handle->on_read (sub { |
1122 | $handle->on_read (sub { |
405 | # some data is here, now queue the length-header-read (4 octets) |
1123 | # some data is here, now queue the length-header-read (4 octets) |
406 | shift->unshift_read_chunk (4, sub { |
1124 | shift->unshift_read (chunk => 4, sub { |
407 | # header arrived, decode |
1125 | # header arrived, decode |
408 | my $len = unpack "N", $_[1]; |
1126 | my $len = unpack "N", $_[1]; |
409 | |
1127 | |
410 | # now read the payload |
1128 | # now read the payload |
411 | shift->unshift_read_chunk ($len, sub { |
1129 | shift->unshift_read (chunk => $len, sub { |
412 | my $xml = $_[1]; |
1130 | my $xml = $_[1]; |
413 | # handle xml |
1131 | # handle xml |
414 | }); |
1132 | }); |
415 | }); |
1133 | }); |
416 | }); |
1134 | }); |
417 | |
1135 | |
418 | Example 2: Implement a client for a protocol that replies either with |
1136 | Example 2: Implement a client for a protocol that replies either with "OK" |
419 | "OK" and another line or "ERROR" for one request, and 64 bytes for the |
1137 | and another line or "ERROR" for the first request that is sent, and 64 |
420 | second request. Due tot he availability of a full queue, we can just |
1138 | bytes for the second request. Due to the availability of a queue, we can |
421 | pipeline sending both requests and manipulate the queue as necessary in |
1139 | just pipeline sending both requests and manipulate the queue as necessary |
422 | the callbacks: |
1140 | in the callbacks. |
423 | |
1141 | |
424 | # request one |
1142 | When the first callback is called and sees an "OK" response, it will |
|
|
1143 | C<unshift> another line-read. This line-read will be queued I<before> the |
|
|
1144 | 64-byte chunk callback. |
|
|
1145 | |
|
|
1146 | # request one, returns either "OK + extra line" or "ERROR" |
425 | $handle->push_write ("request 1\015\012"); |
1147 | $handle->push_write ("request 1\015\012"); |
426 | |
1148 | |
427 | # we expect "ERROR" or "OK" as response, so push a line read |
1149 | # we expect "ERROR" or "OK" as response, so push a line read |
428 | $handle->push_read_line (sub { |
1150 | $handle->push_read (line => sub { |
429 | # if we got an "OK", we have to _prepend_ another line, |
1151 | # if we got an "OK", we have to _prepend_ another line, |
430 | # so it will be read before the second request reads its 64 bytes |
1152 | # so it will be read before the second request reads its 64 bytes |
431 | # which are already in the queue when this callback is called |
1153 | # which are already in the queue when this callback is called |
432 | # we don't do this in case we got an error |
1154 | # we don't do this in case we got an error |
433 | if ($_[1] eq "OK") { |
1155 | if ($_[1] eq "OK") { |
434 | $_[0]->unshift_read_line (sub { |
1156 | $_[0]->unshift_read (line => sub { |
435 | my $response = $_[1]; |
1157 | my $response = $_[1]; |
436 | ... |
1158 | ... |
437 | }); |
1159 | }); |
438 | } |
1160 | } |
439 | }); |
1161 | }); |
440 | |
1162 | |
441 | # request two |
1163 | # request two, simply returns 64 octets |
442 | $handle->push_write ("request 2\015\012"); |
1164 | $handle->push_write ("request 2\015\012"); |
443 | |
1165 | |
444 | # simply read 64 bytes, always |
1166 | # simply read 64 bytes, always |
445 | $handle->push_read_chunk (64, sub { |
1167 | $handle->push_read (chunk => 64, sub { |
446 | my $response = $_[1]; |
1168 | my $response = $_[1]; |
447 | ... |
1169 | ... |
448 | }); |
1170 | }); |
449 | |
1171 | |
450 | =over 4 |
1172 | =over 4 |
451 | |
1173 | |
452 | =cut |
1174 | =cut |
453 | |
1175 | |
454 | sub _drain_rbuf { |
1176 | sub _drain_rbuf { |
455 | my ($self) = @_; |
1177 | my ($self) = @_; |
|
|
1178 | |
|
|
1179 | # avoid recursion |
|
|
1180 | return if $self->{_skip_drain_rbuf}; |
|
|
1181 | local $self->{_skip_drain_rbuf} = 1; |
|
|
1182 | |
|
|
1183 | while () { |
|
|
1184 | # we need to use a separate tls read buffer, as we must not receive data while |
|
|
1185 | # we are draining the buffer, and this can only happen with TLS. |
|
|
1186 | $self->{rbuf} .= delete $self->{_tls_rbuf} |
|
|
1187 | if exists $self->{_tls_rbuf}; |
|
|
1188 | |
|
|
1189 | my $len = length $self->{rbuf}; |
|
|
1190 | |
|
|
1191 | if (my $cb = shift @{ $self->{_queue} }) { |
|
|
1192 | unless ($cb->($self)) { |
|
|
1193 | # no progress can be made |
|
|
1194 | # (not enough data and no data forthcoming) |
|
|
1195 | $self->_error (Errno::EPIPE, 1), return |
|
|
1196 | if $self->{_eof}; |
|
|
1197 | |
|
|
1198 | unshift @{ $self->{_queue} }, $cb; |
|
|
1199 | last; |
|
|
1200 | } |
|
|
1201 | } elsif ($self->{on_read}) { |
|
|
1202 | last unless $len; |
|
|
1203 | |
|
|
1204 | $self->{on_read}($self); |
|
|
1205 | |
|
|
1206 | if ( |
|
|
1207 | $len == length $self->{rbuf} # if no data has been consumed |
|
|
1208 | && !@{ $self->{_queue} } # and the queue is still empty |
|
|
1209 | && $self->{on_read} # but we still have on_read |
|
|
1210 | ) { |
|
|
1211 | # no further data will arrive |
|
|
1212 | # so no progress can be made |
|
|
1213 | $self->_error (Errno::EPIPE, 1), return |
|
|
1214 | if $self->{_eof}; |
|
|
1215 | |
|
|
1216 | last; # more data might arrive |
|
|
1217 | } |
|
|
1218 | } else { |
|
|
1219 | # read side becomes idle |
|
|
1220 | delete $self->{_rw} unless $self->{tls}; |
|
|
1221 | last; |
|
|
1222 | } |
|
|
1223 | } |
|
|
1224 | |
|
|
1225 | if ($self->{_eof}) { |
|
|
1226 | $self->{on_eof} |
|
|
1227 | ? $self->{on_eof}($self) |
|
|
1228 | : $self->_error (0, 1, "Unexpected end-of-file"); |
|
|
1229 | |
|
|
1230 | return; |
|
|
1231 | } |
456 | |
1232 | |
457 | if ( |
1233 | if ( |
458 | defined $self->{rbuf_max} |
1234 | defined $self->{rbuf_max} |
459 | && $self->{rbuf_max} < length $self->{rbuf} |
1235 | && $self->{rbuf_max} < length $self->{rbuf} |
460 | ) { |
1236 | ) { |
461 | $! = &Errno::ENOSPC; return $self->error; |
1237 | $self->_error (Errno::ENOSPC, 1), return; |
462 | } |
1238 | } |
463 | |
1239 | |
464 | return if $self->{in_drain}; |
1240 | # may need to restart read watcher |
465 | local $self->{in_drain} = 1; |
1241 | unless ($self->{_rw}) { |
466 | |
1242 | $self->start_read |
467 | while (my $len = length $self->{rbuf}) { |
1243 | if $self->{on_read} || @{ $self->{_queue} }; |
468 | no strict 'refs'; |
|
|
469 | if (my $cb = shift @{ $self->{queue} }) { |
|
|
470 | unless ($cb->($self)) { |
|
|
471 | if ($self->{eof}) { |
|
|
472 | # no progress can be made (not enough data and no data forthcoming) |
|
|
473 | $! = &Errno::EPIPE; return $self->error; |
|
|
474 | } |
|
|
475 | |
|
|
476 | unshift @{ $self->{queue} }, $cb; |
|
|
477 | return; |
|
|
478 | } |
|
|
479 | } elsif ($self->{on_read}) { |
|
|
480 | $self->{on_read}($self); |
|
|
481 | |
|
|
482 | if ( |
|
|
483 | $self->{eof} # if no further data will arrive |
|
|
484 | && $len == length $self->{rbuf} # and no data has been consumed |
|
|
485 | && !@{ $self->{queue} } # and the queue is still empty |
|
|
486 | && $self->{on_read} # and we still want to read data |
|
|
487 | ) { |
|
|
488 | # then no progress can be made |
|
|
489 | $! = &Errno::EPIPE; return $self->error; |
|
|
490 | } |
|
|
491 | } else { |
|
|
492 | # read side becomes idle |
|
|
493 | delete $self->{rw}; |
|
|
494 | return; |
|
|
495 | } |
|
|
496 | } |
|
|
497 | |
|
|
498 | if ($self->{eof}) { |
|
|
499 | $self->_shutdown; |
|
|
500 | $self->{on_eof}($self) |
|
|
501 | if $self->{on_eof}; |
|
|
502 | } |
1244 | } |
503 | } |
1245 | } |
504 | |
1246 | |
505 | =item $handle->on_read ($cb) |
1247 | =item $handle->on_read ($cb) |
506 | |
1248 | |
507 | This replaces the currently set C<on_read> callback, or clears it (when |
1249 | This replaces the currently set C<on_read> callback, or clears it (when |
508 | the new callback is C<undef>). See the description of C<on_read> in the |
1250 | the new callback is C<undef>). See the description of C<on_read> in the |
509 | constructor. |
1251 | constructor. |
510 | |
1252 | |
|
|
1253 | This method may invoke callbacks (and therefore the handle might be |
|
|
1254 | destroyed after it returns). |
|
|
1255 | |
511 | =cut |
1256 | =cut |
512 | |
1257 | |
513 | sub on_read { |
1258 | sub on_read { |
514 | my ($self, $cb) = @_; |
1259 | my ($self, $cb) = @_; |
515 | |
1260 | |
516 | $self->{on_read} = $cb; |
1261 | $self->{on_read} = $cb; |
|
|
1262 | $self->_drain_rbuf if $cb; |
517 | } |
1263 | } |
518 | |
1264 | |
519 | =item $handle->rbuf |
1265 | =item $handle->rbuf |
520 | |
1266 | |
521 | Returns the read buffer (as a modifiable lvalue). |
1267 | Returns the read buffer (as a modifiable lvalue). |
522 | |
1268 | |
523 | You can access the read buffer directly as the C<< ->{rbuf} >> member, if |
1269 | You can access the read buffer directly as the C<< ->{rbuf} >> |
524 | you want. |
1270 | member, if you want. However, the only operation allowed on the |
|
|
1271 | read buffer (apart from looking at it) is removing data from its |
|
|
1272 | beginning. Otherwise modifying or appending to it is not allowed and will |
|
|
1273 | lead to hard-to-track-down bugs. |
525 | |
1274 | |
526 | NOTE: The read buffer should only be used or modified if the C<on_read>, |
1275 | NOTE: The read buffer should only be used or modified if the C<on_read>, |
527 | C<push_read> or C<unshift_read> methods are used. The other read methods |
1276 | C<push_read> or C<unshift_read> methods are used. The other read methods |
528 | automatically manage the read buffer. |
1277 | automatically manage the read buffer. |
529 | |
1278 | |
… | |
… | |
550 | |
1299 | |
551 | If enough data was available, then the callback must remove all data it is |
1300 | If enough data was available, then the callback must remove all data it is |
552 | interested in (which can be none at all) and return a true value. After returning |
1301 | interested in (which can be none at all) and return a true value. After returning |
553 | true, it will be removed from the queue. |
1302 | true, it will be removed from the queue. |
554 | |
1303 | |
|
|
1304 | These methods may invoke callbacks (and therefore the handle might be |
|
|
1305 | destroyed after it returns). |
|
|
1306 | |
555 | =cut |
1307 | =cut |
|
|
1308 | |
|
|
1309 | our %RH; |
|
|
1310 | |
|
|
1311 | sub register_read_type($$) { |
|
|
1312 | $RH{$_[0]} = $_[1]; |
|
|
1313 | } |
556 | |
1314 | |
557 | sub push_read { |
1315 | sub push_read { |
558 | my $self = shift; |
1316 | my $self = shift; |
559 | my $cb = pop; |
1317 | my $cb = pop; |
560 | |
1318 | |
561 | if (@_) { |
1319 | if (@_) { |
562 | my $type = shift; |
1320 | my $type = shift; |
563 | |
1321 | |
|
|
1322 | $cb = ($RH{$type} ||= _load_func "$type\::anyevent_read_type" |
564 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read") |
1323 | or Carp::croak "unsupported/unloadable type '$type' passed to AnyEvent::Handle::push_read") |
565 | ->($self, $cb, @_); |
1324 | ->($self, $cb, @_); |
566 | } |
1325 | } |
567 | |
1326 | |
568 | push @{ $self->{queue} }, $cb; |
1327 | push @{ $self->{_queue} }, $cb; |
569 | $self->_drain_rbuf; |
1328 | $self->_drain_rbuf; |
570 | } |
1329 | } |
571 | |
1330 | |
572 | sub unshift_read { |
1331 | sub unshift_read { |
573 | my $self = shift; |
1332 | my $self = shift; |
… | |
… | |
578 | |
1337 | |
579 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read") |
1338 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read") |
580 | ->($self, $cb, @_); |
1339 | ->($self, $cb, @_); |
581 | } |
1340 | } |
582 | |
1341 | |
583 | |
|
|
584 | unshift @{ $self->{queue} }, $cb; |
1342 | unshift @{ $self->{_queue} }, $cb; |
585 | $self->_drain_rbuf; |
1343 | $self->_drain_rbuf; |
586 | } |
1344 | } |
587 | |
1345 | |
588 | =item $handle->push_read (type => @args, $cb) |
1346 | =item $handle->push_read (type => @args, $cb) |
589 | |
1347 | |
590 | =item $handle->unshift_read (type => @args, $cb) |
1348 | =item $handle->unshift_read (type => @args, $cb) |
591 | |
1349 | |
592 | Instead of providing a callback that parses the data itself you can chose |
1350 | Instead of providing a callback that parses the data itself you can chose |
593 | between a number of predefined parsing formats, for chunks of data, lines |
1351 | between a number of predefined parsing formats, for chunks of data, lines |
594 | etc. |
1352 | etc. You can also specify the (fully qualified) name of a package, in |
|
|
1353 | which case AnyEvent tries to load the package and then expects to find the |
|
|
1354 | C<anyevent_read_type> function inside (see "custom read types", below). |
595 | |
1355 | |
596 | The types currently supported are: |
1356 | Predefined types are (if you have ideas for additional types, feel free to |
|
|
1357 | drop by and tell us): |
597 | |
1358 | |
598 | =over 4 |
1359 | =over 4 |
599 | |
1360 | |
600 | =item chunk => $octets, $cb->($self, $data) |
1361 | =item chunk => $octets, $cb->($handle, $data) |
601 | |
1362 | |
602 | Invoke the callback only once C<$octets> bytes have been read. Pass the |
1363 | Invoke the callback only once C<$octets> bytes have been read. Pass the |
603 | data read to the callback. The callback will never be called with less |
1364 | data read to the callback. The callback will never be called with less |
604 | data. |
1365 | data. |
605 | |
1366 | |
… | |
… | |
619 | $cb->($_[0], substr $_[0]{rbuf}, 0, $len, ""); |
1380 | $cb->($_[0], substr $_[0]{rbuf}, 0, $len, ""); |
620 | 1 |
1381 | 1 |
621 | } |
1382 | } |
622 | }; |
1383 | }; |
623 | |
1384 | |
624 | # compatibility with older API |
|
|
625 | sub push_read_chunk { |
|
|
626 | $_[0]->push_read (chunk => $_[1], $_[2]); |
|
|
627 | } |
|
|
628 | |
|
|
629 | sub unshift_read_chunk { |
|
|
630 | $_[0]->unshift_read (chunk => $_[1], $_[2]); |
|
|
631 | } |
|
|
632 | |
|
|
633 | =item line => [$eol, ]$cb->($self, $line, $eol) |
1385 | =item line => [$eol, ]$cb->($handle, $line, $eol) |
634 | |
1386 | |
635 | The callback will be called only once a full line (including the end of |
1387 | The callback will be called only once a full line (including the end of |
636 | line marker, C<$eol>) has been read. This line (excluding the end of line |
1388 | line marker, C<$eol>) has been read. This line (excluding the end of line |
637 | marker) will be passed to the callback as second argument (C<$line>), and |
1389 | marker) will be passed to the callback as second argument (C<$line>), and |
638 | the end of line marker as the third argument (C<$eol>). |
1390 | the end of line marker as the third argument (C<$eol>). |
… | |
… | |
652 | =cut |
1404 | =cut |
653 | |
1405 | |
654 | register_read_type line => sub { |
1406 | register_read_type line => sub { |
655 | my ($self, $cb, $eol) = @_; |
1407 | my ($self, $cb, $eol) = @_; |
656 | |
1408 | |
657 | $eol = qr|(\015?\012)| if @_ < 3; |
1409 | if (@_ < 3) { |
|
|
1410 | # this is more than twice as fast as the generic code below |
|
|
1411 | sub { |
|
|
1412 | $_[0]{rbuf} =~ s/^([^\015\012]*)(\015?\012)// or return; |
|
|
1413 | |
|
|
1414 | $cb->($_[0], $1, $2); |
|
|
1415 | 1 |
|
|
1416 | } |
|
|
1417 | } else { |
658 | $eol = quotemeta $eol unless ref $eol; |
1418 | $eol = quotemeta $eol unless ref $eol; |
659 | $eol = qr|^(.*?)($eol)|s; |
1419 | $eol = qr|^(.*?)($eol)|s; |
|
|
1420 | |
|
|
1421 | sub { |
|
|
1422 | $_[0]{rbuf} =~ s/$eol// or return; |
|
|
1423 | |
|
|
1424 | $cb->($_[0], $1, $2); |
|
|
1425 | 1 |
|
|
1426 | } |
|
|
1427 | } |
|
|
1428 | }; |
|
|
1429 | |
|
|
1430 | =item regex => $accept[, $reject[, $skip], $cb->($handle, $data) |
|
|
1431 | |
|
|
1432 | Makes a regex match against the regex object C<$accept> and returns |
|
|
1433 | everything up to and including the match. |
|
|
1434 | |
|
|
1435 | Example: read a single line terminated by '\n'. |
|
|
1436 | |
|
|
1437 | $handle->push_read (regex => qr<\n>, sub { ... }); |
|
|
1438 | |
|
|
1439 | If C<$reject> is given and not undef, then it determines when the data is |
|
|
1440 | to be rejected: it is matched against the data when the C<$accept> regex |
|
|
1441 | does not match and generates an C<EBADMSG> error when it matches. This is |
|
|
1442 | useful to quickly reject wrong data (to avoid waiting for a timeout or a |
|
|
1443 | receive buffer overflow). |
|
|
1444 | |
|
|
1445 | Example: expect a single decimal number followed by whitespace, reject |
|
|
1446 | anything else (not the use of an anchor). |
|
|
1447 | |
|
|
1448 | $handle->push_read (regex => qr<^[0-9]+\s>, qr<[^0-9]>, sub { ... }); |
|
|
1449 | |
|
|
1450 | If C<$skip> is given and not C<undef>, then it will be matched against |
|
|
1451 | the receive buffer when neither C<$accept> nor C<$reject> match, |
|
|
1452 | and everything preceding and including the match will be accepted |
|
|
1453 | unconditionally. This is useful to skip large amounts of data that you |
|
|
1454 | know cannot be matched, so that the C<$accept> or C<$reject> regex do not |
|
|
1455 | have to start matching from the beginning. This is purely an optimisation |
|
|
1456 | and is usually worth only when you expect more than a few kilobytes. |
|
|
1457 | |
|
|
1458 | Example: expect a http header, which ends at C<\015\012\015\012>. Since we |
|
|
1459 | expect the header to be very large (it isn't in practise, but...), we use |
|
|
1460 | a skip regex to skip initial portions. The skip regex is tricky in that |
|
|
1461 | it only accepts something not ending in either \015 or \012, as these are |
|
|
1462 | required for the accept regex. |
|
|
1463 | |
|
|
1464 | $handle->push_read (regex => |
|
|
1465 | qr<\015\012\015\012>, |
|
|
1466 | undef, # no reject |
|
|
1467 | qr<^.*[^\015\012]>, |
|
|
1468 | sub { ... }); |
|
|
1469 | |
|
|
1470 | =cut |
|
|
1471 | |
|
|
1472 | register_read_type regex => sub { |
|
|
1473 | my ($self, $cb, $accept, $reject, $skip) = @_; |
|
|
1474 | |
|
|
1475 | my $data; |
|
|
1476 | my $rbuf = \$self->{rbuf}; |
660 | |
1477 | |
661 | sub { |
1478 | sub { |
662 | $_[0]{rbuf} =~ s/$eol// or return; |
1479 | # accept |
663 | |
1480 | if ($$rbuf =~ $accept) { |
664 | $cb->($_[0], $1, $2); |
1481 | $data .= substr $$rbuf, 0, $+[0], ""; |
|
|
1482 | $cb->($self, $data); |
|
|
1483 | return 1; |
|
|
1484 | } |
665 | 1 |
1485 | |
|
|
1486 | # reject |
|
|
1487 | if ($reject && $$rbuf =~ $reject) { |
|
|
1488 | $self->_error (Errno::EBADMSG); |
|
|
1489 | } |
|
|
1490 | |
|
|
1491 | # skip |
|
|
1492 | if ($skip && $$rbuf =~ $skip) { |
|
|
1493 | $data .= substr $$rbuf, 0, $+[0], ""; |
|
|
1494 | } |
|
|
1495 | |
|
|
1496 | () |
666 | } |
1497 | } |
667 | }; |
1498 | }; |
668 | |
1499 | |
669 | # compatibility with older API |
|
|
670 | sub push_read_line { |
|
|
671 | my $self = shift; |
|
|
672 | $self->push_read (line => @_); |
|
|
673 | } |
|
|
674 | |
|
|
675 | sub unshift_read_line { |
|
|
676 | my $self = shift; |
|
|
677 | $self->unshift_read (line => @_); |
|
|
678 | } |
|
|
679 | |
|
|
680 | =item netstring => $cb->($string) |
1500 | =item netstring => $cb->($handle, $string) |
681 | |
1501 | |
682 | A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement). |
1502 | A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement). |
683 | |
1503 | |
684 | Throws an error with C<$!> set to EBADMSG on format violations. |
1504 | Throws an error with C<$!> set to EBADMSG on format violations. |
685 | |
1505 | |
… | |
… | |
689 | my ($self, $cb) = @_; |
1509 | my ($self, $cb) = @_; |
690 | |
1510 | |
691 | sub { |
1511 | sub { |
692 | unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) { |
1512 | unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) { |
693 | if ($_[0]{rbuf} =~ /[^0-9]/) { |
1513 | if ($_[0]{rbuf} =~ /[^0-9]/) { |
694 | $! = &Errno::EBADMSG; |
1514 | $self->_error (Errno::EBADMSG); |
695 | $self->error; |
|
|
696 | } |
1515 | } |
697 | return; |
1516 | return; |
698 | } |
1517 | } |
699 | |
1518 | |
700 | my $len = $1; |
1519 | my $len = $1; |
… | |
… | |
703 | my $string = $_[1]; |
1522 | my $string = $_[1]; |
704 | $_[0]->unshift_read (chunk => 1, sub { |
1523 | $_[0]->unshift_read (chunk => 1, sub { |
705 | if ($_[1] eq ",") { |
1524 | if ($_[1] eq ",") { |
706 | $cb->($_[0], $string); |
1525 | $cb->($_[0], $string); |
707 | } else { |
1526 | } else { |
708 | $! = &Errno::EBADMSG; |
|
|
709 | $self->error; |
1527 | $self->_error (Errno::EBADMSG); |
710 | } |
1528 | } |
711 | }); |
1529 | }); |
712 | }); |
1530 | }); |
713 | |
1531 | |
714 | 1 |
1532 | 1 |
715 | } |
1533 | } |
716 | }; |
1534 | }; |
717 | |
1535 | |
|
|
1536 | =item packstring => $format, $cb->($handle, $string) |
|
|
1537 | |
|
|
1538 | An octet string prefixed with an encoded length. The encoding C<$format> |
|
|
1539 | uses the same format as a Perl C<pack> format, but must specify a single |
|
|
1540 | integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an |
|
|
1541 | optional C<!>, C<< < >> or C<< > >> modifier). |
|
|
1542 | |
|
|
1543 | For example, DNS over TCP uses a prefix of C<n> (2 octet network order), |
|
|
1544 | EPP uses a prefix of C<N> (4 octtes). |
|
|
1545 | |
|
|
1546 | Example: read a block of data prefixed by its length in BER-encoded |
|
|
1547 | format (very efficient). |
|
|
1548 | |
|
|
1549 | $handle->push_read (packstring => "w", sub { |
|
|
1550 | my ($handle, $data) = @_; |
|
|
1551 | }); |
|
|
1552 | |
|
|
1553 | =cut |
|
|
1554 | |
|
|
1555 | register_read_type packstring => sub { |
|
|
1556 | my ($self, $cb, $format) = @_; |
|
|
1557 | |
|
|
1558 | sub { |
|
|
1559 | # when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method |
|
|
1560 | defined (my $len = eval { unpack $format, $_[0]{rbuf} }) |
|
|
1561 | or return; |
|
|
1562 | |
|
|
1563 | $format = length pack $format, $len; |
|
|
1564 | |
|
|
1565 | # bypass unshift if we already have the remaining chunk |
|
|
1566 | if ($format + $len <= length $_[0]{rbuf}) { |
|
|
1567 | my $data = substr $_[0]{rbuf}, $format, $len; |
|
|
1568 | substr $_[0]{rbuf}, 0, $format + $len, ""; |
|
|
1569 | $cb->($_[0], $data); |
|
|
1570 | } else { |
|
|
1571 | # remove prefix |
|
|
1572 | substr $_[0]{rbuf}, 0, $format, ""; |
|
|
1573 | |
|
|
1574 | # read remaining chunk |
|
|
1575 | $_[0]->unshift_read (chunk => $len, $cb); |
|
|
1576 | } |
|
|
1577 | |
|
|
1578 | 1 |
|
|
1579 | } |
|
|
1580 | }; |
|
|
1581 | |
|
|
1582 | =item json => $cb->($handle, $hash_or_arrayref) |
|
|
1583 | |
|
|
1584 | Reads a JSON object or array, decodes it and passes it to the |
|
|
1585 | callback. When a parse error occurs, an C<EBADMSG> error will be raised. |
|
|
1586 | |
|
|
1587 | If a C<json> object was passed to the constructor, then that will be used |
|
|
1588 | for the final decode, otherwise it will create a JSON coder expecting UTF-8. |
|
|
1589 | |
|
|
1590 | This read type uses the incremental parser available with JSON version |
|
|
1591 | 2.09 (and JSON::XS version 2.2) and above. You have to provide a |
|
|
1592 | dependency on your own: this module will load the JSON module, but |
|
|
1593 | AnyEvent does not depend on it itself. |
|
|
1594 | |
|
|
1595 | Since JSON texts are fully self-delimiting, the C<json> read and write |
|
|
1596 | types are an ideal simple RPC protocol: just exchange JSON datagrams. See |
|
|
1597 | the C<json> write type description, above, for an actual example. |
|
|
1598 | |
|
|
1599 | =cut |
|
|
1600 | |
|
|
1601 | register_read_type json => sub { |
|
|
1602 | my ($self, $cb) = @_; |
|
|
1603 | |
|
|
1604 | my $json = $self->{json} ||= json_coder; |
|
|
1605 | |
|
|
1606 | my $data; |
|
|
1607 | my $rbuf = \$self->{rbuf}; |
|
|
1608 | |
|
|
1609 | sub { |
|
|
1610 | my $ref = eval { $json->incr_parse ($self->{rbuf}) }; |
|
|
1611 | |
|
|
1612 | if ($ref) { |
|
|
1613 | $self->{rbuf} = $json->incr_text; |
|
|
1614 | $json->incr_text = ""; |
|
|
1615 | $cb->($self, $ref); |
|
|
1616 | |
|
|
1617 | 1 |
|
|
1618 | } elsif ($@) { |
|
|
1619 | # error case |
|
|
1620 | $json->incr_skip; |
|
|
1621 | |
|
|
1622 | $self->{rbuf} = $json->incr_text; |
|
|
1623 | $json->incr_text = ""; |
|
|
1624 | |
|
|
1625 | $self->_error (Errno::EBADMSG); |
|
|
1626 | |
|
|
1627 | () |
|
|
1628 | } else { |
|
|
1629 | $self->{rbuf} = ""; |
|
|
1630 | |
|
|
1631 | () |
|
|
1632 | } |
|
|
1633 | } |
|
|
1634 | }; |
|
|
1635 | |
|
|
1636 | =item storable => $cb->($handle, $ref) |
|
|
1637 | |
|
|
1638 | Deserialises a L<Storable> frozen representation as written by the |
|
|
1639 | C<storable> write type (BER-encoded length prefix followed by nfreeze'd |
|
|
1640 | data). |
|
|
1641 | |
|
|
1642 | Raises C<EBADMSG> error if the data could not be decoded. |
|
|
1643 | |
|
|
1644 | =cut |
|
|
1645 | |
|
|
1646 | register_read_type storable => sub { |
|
|
1647 | my ($self, $cb) = @_; |
|
|
1648 | |
|
|
1649 | require Storable; |
|
|
1650 | |
|
|
1651 | sub { |
|
|
1652 | # when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method |
|
|
1653 | defined (my $len = eval { unpack "w", $_[0]{rbuf} }) |
|
|
1654 | or return; |
|
|
1655 | |
|
|
1656 | my $format = length pack "w", $len; |
|
|
1657 | |
|
|
1658 | # bypass unshift if we already have the remaining chunk |
|
|
1659 | if ($format + $len <= length $_[0]{rbuf}) { |
|
|
1660 | my $data = substr $_[0]{rbuf}, $format, $len; |
|
|
1661 | substr $_[0]{rbuf}, 0, $format + $len, ""; |
|
|
1662 | $cb->($_[0], Storable::thaw ($data)); |
|
|
1663 | } else { |
|
|
1664 | # remove prefix |
|
|
1665 | substr $_[0]{rbuf}, 0, $format, ""; |
|
|
1666 | |
|
|
1667 | # read remaining chunk |
|
|
1668 | $_[0]->unshift_read (chunk => $len, sub { |
|
|
1669 | if (my $ref = eval { Storable::thaw ($_[1]) }) { |
|
|
1670 | $cb->($_[0], $ref); |
|
|
1671 | } else { |
|
|
1672 | $self->_error (Errno::EBADMSG); |
|
|
1673 | } |
|
|
1674 | }); |
|
|
1675 | } |
|
|
1676 | |
|
|
1677 | 1 |
|
|
1678 | } |
|
|
1679 | }; |
|
|
1680 | |
718 | =back |
1681 | =back |
719 | |
1682 | |
|
|
1683 | =item custom read types - Package::anyevent_read_type $handle, $cb, @args |
|
|
1684 | |
|
|
1685 | Instead of one of the predefined types, you can also specify the name |
|
|
1686 | of a package. AnyEvent will try to load the package and then expects to |
|
|
1687 | find a function named C<anyevent_read_type> inside. If it isn't found, it |
|
|
1688 | progressively tries to load the parent package until it either finds the |
|
|
1689 | function (good) or runs out of packages (bad). |
|
|
1690 | |
|
|
1691 | Whenever this type is used, C<push_read> will invoke the function with the |
|
|
1692 | handle object, the original callback and the remaining arguments. |
|
|
1693 | |
|
|
1694 | The function is supposed to return a callback (usually a closure) that |
|
|
1695 | works as a plain read callback (see C<< ->push_read ($cb) >>), so you can |
|
|
1696 | mentally treat the function as a "configurable read type to read callback" |
|
|
1697 | converter. |
|
|
1698 | |
|
|
1699 | It should invoke the original callback when it is done reading (remember |
|
|
1700 | to pass C<$handle> as first argument as all other callbacks do that, |
|
|
1701 | although there is no strict requirement on this). |
|
|
1702 | |
|
|
1703 | For examples, see the source of this module (F<perldoc -m |
|
|
1704 | AnyEvent::Handle>, search for C<register_read_type>)). |
|
|
1705 | |
720 | =item $handle->stop_read |
1706 | =item $handle->stop_read |
721 | |
1707 | |
722 | =item $handle->start_read |
1708 | =item $handle->start_read |
723 | |
1709 | |
724 | In rare cases you actually do not want to read anything from the |
1710 | In rare cases you actually do not want to read anything from the |
725 | socket. In this case you can call C<stop_read>. Neither C<on_read> no |
1711 | socket. In this case you can call C<stop_read>. Neither C<on_read> nor |
726 | any queued callbacks will be executed then. To start reading again, call |
1712 | any queued callbacks will be executed then. To start reading again, call |
727 | C<start_read>. |
1713 | C<start_read>. |
728 | |
1714 | |
|
|
1715 | Note that AnyEvent::Handle will automatically C<start_read> for you when |
|
|
1716 | you change the C<on_read> callback or push/unshift a read callback, and it |
|
|
1717 | will automatically C<stop_read> for you when neither C<on_read> is set nor |
|
|
1718 | there are any read requests in the queue. |
|
|
1719 | |
|
|
1720 | These methods will have no effect when in TLS mode (as TLS doesn't support |
|
|
1721 | half-duplex connections). |
|
|
1722 | |
729 | =cut |
1723 | =cut |
730 | |
1724 | |
731 | sub stop_read { |
1725 | sub stop_read { |
732 | my ($self) = @_; |
1726 | my ($self) = @_; |
733 | |
1727 | |
734 | delete $self->{rw}; |
1728 | delete $self->{_rw} unless $self->{tls}; |
735 | } |
1729 | } |
736 | |
1730 | |
737 | sub start_read { |
1731 | sub start_read { |
738 | my ($self) = @_; |
1732 | my ($self) = @_; |
739 | |
1733 | |
740 | unless ($self->{rw} || $self->{eof}) { |
1734 | unless ($self->{_rw} || $self->{_eof} || !$self->{fh}) { |
741 | Scalar::Util::weaken $self; |
1735 | Scalar::Util::weaken $self; |
742 | |
1736 | |
743 | $self->{rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub { |
1737 | $self->{_rw} = AE::io $self->{fh}, 0, sub { |
744 | my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf}; |
1738 | my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf}); |
745 | my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf; |
1739 | my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf; |
746 | |
1740 | |
747 | if ($len > 0) { |
1741 | if ($len > 0) { |
748 | $self->{filter_r} |
1742 | $self->{_activity} = $self->{_ractivity} = AE::now; |
749 | ? $self->{filter_r}->($self, $rbuf) |
1743 | |
|
|
1744 | if ($self->{tls}) { |
|
|
1745 | Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf); |
|
|
1746 | |
|
|
1747 | &_dotls ($self); |
|
|
1748 | } else { |
750 | : $self->_drain_rbuf; |
1749 | $self->_drain_rbuf; |
|
|
1750 | } |
751 | |
1751 | |
752 | } elsif (defined $len) { |
1752 | } elsif (defined $len) { |
753 | delete $self->{rw}; |
1753 | delete $self->{_rw}; |
754 | $self->{eof} = 1; |
1754 | $self->{_eof} = 1; |
755 | $self->_drain_rbuf; |
1755 | $self->_drain_rbuf; |
756 | |
1756 | |
757 | } elsif ($! != EAGAIN && $! != EINTR) { |
1757 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) { |
758 | return $self->error; |
1758 | return $self->_error ($!, 1); |
759 | } |
1759 | } |
760 | }); |
1760 | }; |
761 | } |
1761 | } |
762 | } |
1762 | } |
763 | |
1763 | |
|
|
1764 | our $ERROR_SYSCALL; |
|
|
1765 | our $ERROR_WANT_READ; |
|
|
1766 | |
|
|
1767 | sub _tls_error { |
|
|
1768 | my ($self, $err) = @_; |
|
|
1769 | |
|
|
1770 | return $self->_error ($!, 1) |
|
|
1771 | if $err == Net::SSLeay::ERROR_SYSCALL (); |
|
|
1772 | |
|
|
1773 | my $err =Net::SSLeay::ERR_error_string (Net::SSLeay::ERR_get_error ()); |
|
|
1774 | |
|
|
1775 | # reduce error string to look less scary |
|
|
1776 | $err =~ s/^error:[0-9a-fA-F]{8}:[^:]+:([^:]+):/\L$1: /; |
|
|
1777 | |
|
|
1778 | if ($self->{_on_starttls}) { |
|
|
1779 | (delete $self->{_on_starttls})->($self, undef, $err); |
|
|
1780 | &_freetls; |
|
|
1781 | } else { |
|
|
1782 | &_freetls; |
|
|
1783 | $self->_error (Errno::EPROTO, 1, $err); |
|
|
1784 | } |
|
|
1785 | } |
|
|
1786 | |
|
|
1787 | # poll the write BIO and send the data if applicable |
|
|
1788 | # also decode read data if possible |
|
|
1789 | # this is basiclaly our TLS state machine |
|
|
1790 | # more efficient implementations are possible with openssl, |
|
|
1791 | # but not with the buggy and incomplete Net::SSLeay. |
764 | sub _dotls { |
1792 | sub _dotls { |
765 | my ($self) = @_; |
1793 | my ($self) = @_; |
766 | |
1794 | |
|
|
1795 | my $tmp; |
|
|
1796 | |
767 | if (length $self->{tls_wbuf}) { |
1797 | if (length $self->{_tls_wbuf}) { |
768 | while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{tls_wbuf})) > 0) { |
1798 | while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) { |
769 | substr $self->{tls_wbuf}, 0, $len, ""; |
1799 | substr $self->{_tls_wbuf}, 0, $tmp, ""; |
770 | } |
1800 | } |
771 | } |
|
|
772 | |
1801 | |
|
|
1802 | $tmp = Net::SSLeay::get_error ($self->{tls}, $tmp); |
|
|
1803 | return $self->_tls_error ($tmp) |
|
|
1804 | if $tmp != $ERROR_WANT_READ |
|
|
1805 | && ($tmp != $ERROR_SYSCALL || $!); |
|
|
1806 | } |
|
|
1807 | |
773 | if (defined (my $buf = Net::SSLeay::BIO_read ($self->{tls_wbio}))) { |
1808 | while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) { |
|
|
1809 | unless (length $tmp) { |
|
|
1810 | $self->{_on_starttls} |
|
|
1811 | and (delete $self->{_on_starttls})->($self, undef, "EOF during handshake"); # ??? |
|
|
1812 | &_freetls; |
|
|
1813 | |
|
|
1814 | if ($self->{on_stoptls}) { |
|
|
1815 | $self->{on_stoptls}($self); |
|
|
1816 | return; |
|
|
1817 | } else { |
|
|
1818 | # let's treat SSL-eof as we treat normal EOF |
|
|
1819 | delete $self->{_rw}; |
|
|
1820 | $self->{_eof} = 1; |
|
|
1821 | } |
|
|
1822 | } |
|
|
1823 | |
|
|
1824 | $self->{_tls_rbuf} .= $tmp; |
|
|
1825 | $self->_drain_rbuf; |
|
|
1826 | $self->{tls} or return; # tls session might have gone away in callback |
|
|
1827 | } |
|
|
1828 | |
|
|
1829 | $tmp = Net::SSLeay::get_error ($self->{tls}, -1); |
|
|
1830 | return $self->_tls_error ($tmp) |
|
|
1831 | if $tmp != $ERROR_WANT_READ |
|
|
1832 | && ($tmp != $ERROR_SYSCALL || $!); |
|
|
1833 | |
|
|
1834 | while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) { |
774 | $self->{wbuf} .= $buf; |
1835 | $self->{wbuf} .= $tmp; |
775 | $self->_drain_wbuf; |
1836 | $self->_drain_wbuf; |
|
|
1837 | $self->{tls} or return; # tls session might have gone away in callback |
776 | } |
1838 | } |
777 | |
1839 | |
778 | while (defined (my $buf = Net::SSLeay::read ($self->{tls}))) { |
1840 | $self->{_on_starttls} |
779 | $self->{rbuf} .= $buf; |
1841 | and Net::SSLeay::state ($self->{tls}) == Net::SSLeay::ST_OK () |
780 | $self->_drain_rbuf; |
1842 | and (delete $self->{_on_starttls})->($self, 1, "TLS/SSL connection established"); |
781 | } |
|
|
782 | |
|
|
783 | my $err = Net::SSLeay::get_error ($self->{tls}, -1); |
|
|
784 | |
|
|
785 | if ($err!= Net::SSLeay::ERROR_WANT_READ ()) { |
|
|
786 | if ($err == Net::SSLeay::ERROR_SYSCALL ()) { |
|
|
787 | $self->error; |
|
|
788 | } elsif ($err == Net::SSLeay::ERROR_SSL ()) { |
|
|
789 | $! = &Errno::EIO; |
|
|
790 | $self->error; |
|
|
791 | } |
|
|
792 | |
|
|
793 | # all others are fine for our purposes |
|
|
794 | } |
|
|
795 | } |
1843 | } |
796 | |
1844 | |
797 | =item $handle->starttls ($tls[, $tls_ctx]) |
1845 | =item $handle->starttls ($tls[, $tls_ctx]) |
798 | |
1846 | |
799 | Instead of starting TLS negotiation immediately when the AnyEvent::Handle |
1847 | Instead of starting TLS negotiation immediately when the AnyEvent::Handle |
800 | object is created, you can also do that at a later time by calling |
1848 | object is created, you can also do that at a later time by calling |
801 | C<starttls>. |
1849 | C<starttls>. |
802 | |
1850 | |
|
|
1851 | Starting TLS is currently an asynchronous operation - when you push some |
|
|
1852 | write data and then call C<< ->starttls >> then TLS negotiation will start |
|
|
1853 | immediately, after which the queued write data is then sent. |
|
|
1854 | |
803 | The first argument is the same as the C<tls> constructor argument (either |
1855 | The first argument is the same as the C<tls> constructor argument (either |
804 | C<"connect">, C<"accept"> or an existing Net::SSLeay object). |
1856 | C<"connect">, C<"accept"> or an existing Net::SSLeay object). |
805 | |
1857 | |
806 | The second argument is the optional C<Net::SSLeay::CTX> object that is |
1858 | The second argument is the optional C<AnyEvent::TLS> object that is used |
807 | used when AnyEvent::Handle has to create its own TLS connection object. |
1859 | when AnyEvent::Handle has to create its own TLS connection object, or |
|
|
1860 | a hash reference with C<< key => value >> pairs that will be used to |
|
|
1861 | construct a new context. |
808 | |
1862 | |
809 | =cut |
1863 | The TLS connection object will end up in C<< $handle->{tls} >>, the TLS |
|
|
1864 | context in C<< $handle->{tls_ctx} >> after this call and can be used or |
|
|
1865 | changed to your liking. Note that the handshake might have already started |
|
|
1866 | when this function returns. |
810 | |
1867 | |
811 | # TODO: maybe document... |
1868 | Due to bugs in OpenSSL, it might or might not be possible to do multiple |
|
|
1869 | handshakes on the same stream. Best do not attempt to use the stream after |
|
|
1870 | stopping TLS. |
|
|
1871 | |
|
|
1872 | This method may invoke callbacks (and therefore the handle might be |
|
|
1873 | destroyed after it returns). |
|
|
1874 | |
|
|
1875 | =cut |
|
|
1876 | |
|
|
1877 | our %TLS_CACHE; #TODO not yet documented, should we? |
|
|
1878 | |
812 | sub starttls { |
1879 | sub starttls { |
813 | my ($self, $ssl, $ctx) = @_; |
1880 | my ($self, $tls, $ctx) = @_; |
814 | |
1881 | |
815 | $self->stoptls; |
1882 | Carp::croak "It is an error to call starttls on an AnyEvent::Handle object while TLS is already active, caught" |
|
|
1883 | if $self->{tls}; |
816 | |
1884 | |
817 | if ($ssl eq "accept") { |
1885 | $self->{tls} = $tls; |
818 | $ssl = Net::SSLeay::new ($ctx || TLS_CTX ()); |
1886 | $self->{tls_ctx} = $ctx if @_ > 2; |
819 | Net::SSLeay::set_accept_state ($ssl); |
1887 | |
820 | } elsif ($ssl eq "connect") { |
1888 | return unless $self->{fh}; |
821 | $ssl = Net::SSLeay::new ($ctx || TLS_CTX ()); |
1889 | |
822 | Net::SSLeay::set_connect_state ($ssl); |
1890 | require Net::SSLeay; |
|
|
1891 | |
|
|
1892 | $ERROR_SYSCALL = Net::SSLeay::ERROR_SYSCALL (); |
|
|
1893 | $ERROR_WANT_READ = Net::SSLeay::ERROR_WANT_READ (); |
|
|
1894 | |
|
|
1895 | $tls = delete $self->{tls}; |
|
|
1896 | $ctx = $self->{tls_ctx}; |
|
|
1897 | |
|
|
1898 | local $Carp::CarpLevel = 1; # skip ourselves when creating a new context or session |
|
|
1899 | |
|
|
1900 | if ("HASH" eq ref $ctx) { |
|
|
1901 | require AnyEvent::TLS; |
|
|
1902 | |
|
|
1903 | if ($ctx->{cache}) { |
|
|
1904 | my $key = $ctx+0; |
|
|
1905 | $ctx = $TLS_CACHE{$key} ||= new AnyEvent::TLS %$ctx; |
|
|
1906 | } else { |
|
|
1907 | $ctx = new AnyEvent::TLS %$ctx; |
|
|
1908 | } |
|
|
1909 | } |
823 | } |
1910 | |
824 | |
1911 | $self->{tls_ctx} = $ctx || TLS_CTX (); |
825 | $self->{tls} = $ssl; |
1912 | $self->{tls} = $tls = $self->{tls_ctx}->_get_session ($tls, $self, $self->{peername}); |
826 | |
1913 | |
827 | # basically, this is deep magic (because SSL_read should have the same issues) |
1914 | # basically, this is deep magic (because SSL_read should have the same issues) |
828 | # but the openssl maintainers basically said: "trust us, it just works". |
1915 | # but the openssl maintainers basically said: "trust us, it just works". |
829 | # (unfortunately, we have to hardcode constants because the abysmally misdesigned |
1916 | # (unfortunately, we have to hardcode constants because the abysmally misdesigned |
830 | # and mismaintained ssleay-module doesn't even offer them). |
1917 | # and mismaintained ssleay-module doesn't even offer them). |
831 | # http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html |
1918 | # http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html |
|
|
1919 | # |
|
|
1920 | # in short: this is a mess. |
|
|
1921 | # |
|
|
1922 | # note that we do not try to keep the length constant between writes as we are required to do. |
|
|
1923 | # we assume that most (but not all) of this insanity only applies to non-blocking cases, |
|
|
1924 | # and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to |
|
|
1925 | # have identity issues in that area. |
832 | Net::SSLeay::CTX_set_mode ($self->{tls}, |
1926 | # Net::SSLeay::CTX_set_mode ($ssl, |
833 | (eval { Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1) |
1927 | # (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1) |
834 | | (eval { Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2)); |
1928 | # | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2)); |
|
|
1929 | Net::SSLeay::CTX_set_mode ($tls, 1|2); |
835 | |
1930 | |
836 | $self->{tls_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
1931 | $self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
837 | $self->{tls_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
1932 | $self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
838 | |
1933 | |
|
|
1934 | Net::SSLeay::BIO_write ($self->{_rbio}, delete $self->{rbuf}); |
|
|
1935 | |
839 | Net::SSLeay::set_bio ($ssl, $self->{tls_rbio}, $self->{tls_wbio}); |
1936 | Net::SSLeay::set_bio ($tls, $self->{_rbio}, $self->{_wbio}); |
840 | |
1937 | |
841 | $self->{filter_w} = sub { |
1938 | $self->{_on_starttls} = sub { $_[0]{on_starttls}(@_) } |
842 | $_[0]{tls_wbuf} .= ${$_[1]}; |
1939 | if $self->{on_starttls}; |
843 | &_dotls; |
1940 | |
844 | }; |
1941 | &_dotls; # need to trigger the initial handshake |
845 | $self->{filter_r} = sub { |
1942 | $self->start_read; # make sure we actually do read |
846 | Net::SSLeay::BIO_write ($_[0]{tls_rbio}, ${$_[1]}); |
|
|
847 | &_dotls; |
|
|
848 | }; |
|
|
849 | } |
1943 | } |
850 | |
1944 | |
851 | =item $handle->stoptls |
1945 | =item $handle->stoptls |
852 | |
1946 | |
853 | Destroys the SSL connection, if any. Partial read or write data will be |
1947 | Shuts down the SSL connection - this makes a proper EOF handshake by |
854 | lost. |
1948 | sending a close notify to the other side, but since OpenSSL doesn't |
|
|
1949 | support non-blocking shut downs, it is not guaranteed that you can re-use |
|
|
1950 | the stream afterwards. |
|
|
1951 | |
|
|
1952 | This method may invoke callbacks (and therefore the handle might be |
|
|
1953 | destroyed after it returns). |
855 | |
1954 | |
856 | =cut |
1955 | =cut |
857 | |
1956 | |
858 | sub stoptls { |
1957 | sub stoptls { |
859 | my ($self) = @_; |
1958 | my ($self) = @_; |
860 | |
1959 | |
861 | Net::SSLeay::free (delete $self->{tls}) if $self->{tls}; |
1960 | if ($self->{tls} && $self->{fh}) { |
862 | delete $self->{tls_rbio}; |
1961 | Net::SSLeay::shutdown ($self->{tls}); |
863 | delete $self->{tls_wbio}; |
1962 | |
864 | delete $self->{tls_wbuf}; |
1963 | &_dotls; |
865 | delete $self->{filter_r}; |
1964 | |
866 | delete $self->{filter_w}; |
1965 | # # we don't give a shit. no, we do, but we can't. no...#d# |
|
|
1966 | # # we, we... have to use openssl :/#d# |
|
|
1967 | # &_freetls;#d# |
|
|
1968 | } |
|
|
1969 | } |
|
|
1970 | |
|
|
1971 | sub _freetls { |
|
|
1972 | my ($self) = @_; |
|
|
1973 | |
|
|
1974 | return unless $self->{tls}; |
|
|
1975 | |
|
|
1976 | $self->{tls_ctx}->_put_session (delete $self->{tls}) |
|
|
1977 | if $self->{tls} > 0; |
|
|
1978 | |
|
|
1979 | delete @$self{qw(_rbio _wbio _tls_wbuf _on_starttls)}; |
867 | } |
1980 | } |
868 | |
1981 | |
869 | sub DESTROY { |
1982 | sub DESTROY { |
870 | my $self = shift; |
1983 | my ($self) = @_; |
871 | |
1984 | |
872 | $self->stoptls; |
1985 | &_freetls; |
|
|
1986 | |
|
|
1987 | my $linger = exists $self->{linger} ? $self->{linger} : 3600; |
|
|
1988 | |
|
|
1989 | if ($linger && length $self->{wbuf} && $self->{fh}) { |
|
|
1990 | my $fh = delete $self->{fh}; |
|
|
1991 | my $wbuf = delete $self->{wbuf}; |
|
|
1992 | |
|
|
1993 | my @linger; |
|
|
1994 | |
|
|
1995 | push @linger, AE::io $fh, 1, sub { |
|
|
1996 | my $len = syswrite $fh, $wbuf, length $wbuf; |
|
|
1997 | |
|
|
1998 | if ($len > 0) { |
|
|
1999 | substr $wbuf, 0, $len, ""; |
|
|
2000 | } else { |
|
|
2001 | @linger = (); # end |
|
|
2002 | } |
|
|
2003 | }; |
|
|
2004 | push @linger, AE::timer $linger, 0, sub { |
|
|
2005 | @linger = (); |
|
|
2006 | }; |
|
|
2007 | } |
873 | } |
2008 | } |
|
|
2009 | |
|
|
2010 | =item $handle->destroy |
|
|
2011 | |
|
|
2012 | Shuts down the handle object as much as possible - this call ensures that |
|
|
2013 | no further callbacks will be invoked and as many resources as possible |
|
|
2014 | will be freed. Any method you will call on the handle object after |
|
|
2015 | destroying it in this way will be silently ignored (and it will return the |
|
|
2016 | empty list). |
|
|
2017 | |
|
|
2018 | Normally, you can just "forget" any references to an AnyEvent::Handle |
|
|
2019 | object and it will simply shut down. This works in fatal error and EOF |
|
|
2020 | callbacks, as well as code outside. It does I<NOT> work in a read or write |
|
|
2021 | callback, so when you want to destroy the AnyEvent::Handle object from |
|
|
2022 | within such an callback. You I<MUST> call C<< ->destroy >> explicitly in |
|
|
2023 | that case. |
|
|
2024 | |
|
|
2025 | Destroying the handle object in this way has the advantage that callbacks |
|
|
2026 | will be removed as well, so if those are the only reference holders (as |
|
|
2027 | is common), then one doesn't need to do anything special to break any |
|
|
2028 | reference cycles. |
|
|
2029 | |
|
|
2030 | The handle might still linger in the background and write out remaining |
|
|
2031 | data, as specified by the C<linger> option, however. |
|
|
2032 | |
|
|
2033 | =cut |
|
|
2034 | |
|
|
2035 | sub destroy { |
|
|
2036 | my ($self) = @_; |
|
|
2037 | |
|
|
2038 | $self->DESTROY; |
|
|
2039 | %$self = (); |
|
|
2040 | bless $self, "AnyEvent::Handle::destroyed"; |
|
|
2041 | } |
|
|
2042 | |
|
|
2043 | sub AnyEvent::Handle::destroyed::AUTOLOAD { |
|
|
2044 | #nop |
|
|
2045 | } |
|
|
2046 | |
|
|
2047 | =item $handle->destroyed |
|
|
2048 | |
|
|
2049 | Returns false as long as the handle hasn't been destroyed by a call to C<< |
|
|
2050 | ->destroy >>, true otherwise. |
|
|
2051 | |
|
|
2052 | Can be useful to decide whether the handle is still valid after some |
|
|
2053 | callback possibly destroyed the handle. For example, C<< ->push_write >>, |
|
|
2054 | C<< ->starttls >> and other methods can call user callbacks, which in turn |
|
|
2055 | can destroy the handle, so work can be avoided by checking sometimes: |
|
|
2056 | |
|
|
2057 | $hdl->starttls ("accept"); |
|
|
2058 | return if $hdl->destroyed; |
|
|
2059 | $hdl->push_write (... |
|
|
2060 | |
|
|
2061 | Note that the call to C<push_write> will silently be ignored if the handle |
|
|
2062 | has been destroyed, so often you can just ignore the possibility of the |
|
|
2063 | handle being destroyed. |
|
|
2064 | |
|
|
2065 | =cut |
|
|
2066 | |
|
|
2067 | sub destroyed { 0 } |
|
|
2068 | sub AnyEvent::Handle::destroyed::destroyed { 1 } |
874 | |
2069 | |
875 | =item AnyEvent::Handle::TLS_CTX |
2070 | =item AnyEvent::Handle::TLS_CTX |
876 | |
2071 | |
877 | This function creates and returns the Net::SSLeay::CTX object used by |
2072 | This function creates and returns the AnyEvent::TLS object used by default |
878 | default for TLS mode. |
2073 | for TLS mode. |
879 | |
2074 | |
880 | The context is created like this: |
2075 | The context is created by calling L<AnyEvent::TLS> without any arguments. |
881 | |
|
|
882 | Net::SSLeay::load_error_strings; |
|
|
883 | Net::SSLeay::SSLeay_add_ssl_algorithms; |
|
|
884 | Net::SSLeay::randomize; |
|
|
885 | |
|
|
886 | my $CTX = Net::SSLeay::CTX_new; |
|
|
887 | |
|
|
888 | Net::SSLeay::CTX_set_options $CTX, Net::SSLeay::OP_ALL |
|
|
889 | |
2076 | |
890 | =cut |
2077 | =cut |
891 | |
2078 | |
892 | our $TLS_CTX; |
2079 | our $TLS_CTX; |
893 | |
2080 | |
894 | sub TLS_CTX() { |
2081 | sub TLS_CTX() { |
895 | $TLS_CTX || do { |
2082 | $TLS_CTX ||= do { |
896 | require Net::SSLeay; |
2083 | require AnyEvent::TLS; |
897 | |
2084 | |
898 | Net::SSLeay::load_error_strings (); |
2085 | new AnyEvent::TLS |
899 | Net::SSLeay::SSLeay_add_ssl_algorithms (); |
|
|
900 | Net::SSLeay::randomize (); |
|
|
901 | |
|
|
902 | $TLS_CTX = Net::SSLeay::CTX_new (); |
|
|
903 | |
|
|
904 | Net::SSLeay::CTX_set_options ($TLS_CTX, Net::SSLeay::OP_ALL ()); |
|
|
905 | |
|
|
906 | $TLS_CTX |
|
|
907 | } |
2086 | } |
908 | } |
2087 | } |
909 | |
2088 | |
910 | =back |
2089 | =back |
911 | |
2090 | |
|
|
2091 | |
|
|
2092 | =head1 NONFREQUENTLY ASKED QUESTIONS |
|
|
2093 | |
|
|
2094 | =over 4 |
|
|
2095 | |
|
|
2096 | =item I C<undef> the AnyEvent::Handle reference inside my callback and |
|
|
2097 | still get further invocations! |
|
|
2098 | |
|
|
2099 | That's because AnyEvent::Handle keeps a reference to itself when handling |
|
|
2100 | read or write callbacks. |
|
|
2101 | |
|
|
2102 | It is only safe to "forget" the reference inside EOF or error callbacks, |
|
|
2103 | from within all other callbacks, you need to explicitly call the C<< |
|
|
2104 | ->destroy >> method. |
|
|
2105 | |
|
|
2106 | =item I get different callback invocations in TLS mode/Why can't I pause |
|
|
2107 | reading? |
|
|
2108 | |
|
|
2109 | Unlike, say, TCP, TLS connections do not consist of two independent |
|
|
2110 | communication channels, one for each direction. Or put differently. The |
|
|
2111 | read and write directions are not independent of each other: you cannot |
|
|
2112 | write data unless you are also prepared to read, and vice versa. |
|
|
2113 | |
|
|
2114 | This can mean than, in TLS mode, you might get C<on_error> or C<on_eof> |
|
|
2115 | callback invocations when you are not expecting any read data - the reason |
|
|
2116 | is that AnyEvent::Handle always reads in TLS mode. |
|
|
2117 | |
|
|
2118 | During the connection, you have to make sure that you always have a |
|
|
2119 | non-empty read-queue, or an C<on_read> watcher. At the end of the |
|
|
2120 | connection (or when you no longer want to use it) you can call the |
|
|
2121 | C<destroy> method. |
|
|
2122 | |
|
|
2123 | =item How do I read data until the other side closes the connection? |
|
|
2124 | |
|
|
2125 | If you just want to read your data into a perl scalar, the easiest way |
|
|
2126 | to achieve this is by setting an C<on_read> callback that does nothing, |
|
|
2127 | clearing the C<on_eof> callback and in the C<on_error> callback, the data |
|
|
2128 | will be in C<$_[0]{rbuf}>: |
|
|
2129 | |
|
|
2130 | $handle->on_read (sub { }); |
|
|
2131 | $handle->on_eof (undef); |
|
|
2132 | $handle->on_error (sub { |
|
|
2133 | my $data = delete $_[0]{rbuf}; |
|
|
2134 | }); |
|
|
2135 | |
|
|
2136 | The reason to use C<on_error> is that TCP connections, due to latencies |
|
|
2137 | and packets loss, might get closed quite violently with an error, when in |
|
|
2138 | fact, all data has been received. |
|
|
2139 | |
|
|
2140 | It is usually better to use acknowledgements when transferring data, |
|
|
2141 | to make sure the other side hasn't just died and you got the data |
|
|
2142 | intact. This is also one reason why so many internet protocols have an |
|
|
2143 | explicit QUIT command. |
|
|
2144 | |
|
|
2145 | =item I don't want to destroy the handle too early - how do I wait until |
|
|
2146 | all data has been written? |
|
|
2147 | |
|
|
2148 | After writing your last bits of data, set the C<on_drain> callback |
|
|
2149 | and destroy the handle in there - with the default setting of |
|
|
2150 | C<low_water_mark> this will be called precisely when all data has been |
|
|
2151 | written to the socket: |
|
|
2152 | |
|
|
2153 | $handle->push_write (...); |
|
|
2154 | $handle->on_drain (sub { |
|
|
2155 | warn "all data submitted to the kernel\n"; |
|
|
2156 | undef $handle; |
|
|
2157 | }); |
|
|
2158 | |
|
|
2159 | If you just want to queue some data and then signal EOF to the other side, |
|
|
2160 | consider using C<< ->push_shutdown >> instead. |
|
|
2161 | |
|
|
2162 | =item I want to contact a TLS/SSL server, I don't care about security. |
|
|
2163 | |
|
|
2164 | If your TLS server is a pure TLS server (e.g. HTTPS) that only speaks TLS, |
|
|
2165 | simply connect to it and then create the AnyEvent::Handle with the C<tls> |
|
|
2166 | parameter: |
|
|
2167 | |
|
|
2168 | tcp_connect $host, $port, sub { |
|
|
2169 | my ($fh) = @_; |
|
|
2170 | |
|
|
2171 | my $handle = new AnyEvent::Handle |
|
|
2172 | fh => $fh, |
|
|
2173 | tls => "connect", |
|
|
2174 | on_error => sub { ... }; |
|
|
2175 | |
|
|
2176 | $handle->push_write (...); |
|
|
2177 | }; |
|
|
2178 | |
|
|
2179 | =item I want to contact a TLS/SSL server, I do care about security. |
|
|
2180 | |
|
|
2181 | Then you should additionally enable certificate verification, including |
|
|
2182 | peername verification, if the protocol you use supports it (see |
|
|
2183 | L<AnyEvent::TLS>, C<verify_peername>). |
|
|
2184 | |
|
|
2185 | E.g. for HTTPS: |
|
|
2186 | |
|
|
2187 | tcp_connect $host, $port, sub { |
|
|
2188 | my ($fh) = @_; |
|
|
2189 | |
|
|
2190 | my $handle = new AnyEvent::Handle |
|
|
2191 | fh => $fh, |
|
|
2192 | peername => $host, |
|
|
2193 | tls => "connect", |
|
|
2194 | tls_ctx => { verify => 1, verify_peername => "https" }, |
|
|
2195 | ... |
|
|
2196 | |
|
|
2197 | Note that you must specify the hostname you connected to (or whatever |
|
|
2198 | "peername" the protocol needs) as the C<peername> argument, otherwise no |
|
|
2199 | peername verification will be done. |
|
|
2200 | |
|
|
2201 | The above will use the system-dependent default set of trusted CA |
|
|
2202 | certificates. If you want to check against a specific CA, add the |
|
|
2203 | C<ca_file> (or C<ca_cert>) arguments to C<tls_ctx>: |
|
|
2204 | |
|
|
2205 | tls_ctx => { |
|
|
2206 | verify => 1, |
|
|
2207 | verify_peername => "https", |
|
|
2208 | ca_file => "my-ca-cert.pem", |
|
|
2209 | }, |
|
|
2210 | |
|
|
2211 | =item I want to create a TLS/SSL server, how do I do that? |
|
|
2212 | |
|
|
2213 | Well, you first need to get a server certificate and key. You have |
|
|
2214 | three options: a) ask a CA (buy one, use cacert.org etc.) b) create a |
|
|
2215 | self-signed certificate (cheap. check the search engine of your choice, |
|
|
2216 | there are many tutorials on the net) or c) make your own CA (tinyca2 is a |
|
|
2217 | nice program for that purpose). |
|
|
2218 | |
|
|
2219 | Then create a file with your private key (in PEM format, see |
|
|
2220 | L<AnyEvent::TLS>), followed by the certificate (also in PEM format). The |
|
|
2221 | file should then look like this: |
|
|
2222 | |
|
|
2223 | -----BEGIN RSA PRIVATE KEY----- |
|
|
2224 | ...header data |
|
|
2225 | ... lots of base64'y-stuff |
|
|
2226 | -----END RSA PRIVATE KEY----- |
|
|
2227 | |
|
|
2228 | -----BEGIN CERTIFICATE----- |
|
|
2229 | ... lots of base64'y-stuff |
|
|
2230 | -----END CERTIFICATE----- |
|
|
2231 | |
|
|
2232 | The important bits are the "PRIVATE KEY" and "CERTIFICATE" parts. Then |
|
|
2233 | specify this file as C<cert_file>: |
|
|
2234 | |
|
|
2235 | tcp_server undef, $port, sub { |
|
|
2236 | my ($fh) = @_; |
|
|
2237 | |
|
|
2238 | my $handle = new AnyEvent::Handle |
|
|
2239 | fh => $fh, |
|
|
2240 | tls => "accept", |
|
|
2241 | tls_ctx => { cert_file => "my-server-keycert.pem" }, |
|
|
2242 | ... |
|
|
2243 | |
|
|
2244 | When you have intermediate CA certificates that your clients might not |
|
|
2245 | know about, just append them to the C<cert_file>. |
|
|
2246 | |
|
|
2247 | =back |
|
|
2248 | |
|
|
2249 | |
|
|
2250 | =head1 SUBCLASSING AnyEvent::Handle |
|
|
2251 | |
|
|
2252 | In many cases, you might want to subclass AnyEvent::Handle. |
|
|
2253 | |
|
|
2254 | To make this easier, a given version of AnyEvent::Handle uses these |
|
|
2255 | conventions: |
|
|
2256 | |
|
|
2257 | =over 4 |
|
|
2258 | |
|
|
2259 | =item * all constructor arguments become object members. |
|
|
2260 | |
|
|
2261 | At least initially, when you pass a C<tls>-argument to the constructor it |
|
|
2262 | will end up in C<< $handle->{tls} >>. Those members might be changed or |
|
|
2263 | mutated later on (for example C<tls> will hold the TLS connection object). |
|
|
2264 | |
|
|
2265 | =item * other object member names are prefixed with an C<_>. |
|
|
2266 | |
|
|
2267 | All object members not explicitly documented (internal use) are prefixed |
|
|
2268 | with an underscore character, so the remaining non-C<_>-namespace is free |
|
|
2269 | for use for subclasses. |
|
|
2270 | |
|
|
2271 | =item * all members not documented here and not prefixed with an underscore |
|
|
2272 | are free to use in subclasses. |
|
|
2273 | |
|
|
2274 | Of course, new versions of AnyEvent::Handle may introduce more "public" |
|
|
2275 | member variables, but thats just life, at least it is documented. |
|
|
2276 | |
|
|
2277 | =back |
|
|
2278 | |
912 | =head1 AUTHOR |
2279 | =head1 AUTHOR |
913 | |
2280 | |
914 | Robin Redeker C<< <elmex at ta-sa.org> >>, Marc Lehmann <schmorp@schmorp.de>. |
2281 | Robin Redeker C<< <elmex at ta-sa.org> >>, Marc Lehmann <schmorp@schmorp.de>. |
915 | |
2282 | |
916 | =cut |
2283 | =cut |