1 | package AnyEvent::Handle; |
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2 | |
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3 | no warnings; |
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4 | use strict qw(subs vars); |
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5 | |
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6 | use AnyEvent (); |
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7 | use AnyEvent::Util qw(WSAEWOULDBLOCK); |
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8 | use Scalar::Util (); |
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9 | use Carp (); |
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10 | use Fcntl (); |
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11 | use Errno qw(EAGAIN EINTR); |
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12 | |
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13 | =head1 NAME |
1 | =head1 NAME |
14 | |
2 | |
15 | AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent |
3 | AnyEvent::Handle - non-blocking I/O on streaming handles via AnyEvent |
16 | |
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17 | =cut |
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18 | |
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19 | our $VERSION = 4.3; |
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20 | |
4 | |
21 | =head1 SYNOPSIS |
5 | =head1 SYNOPSIS |
22 | |
6 | |
23 | use AnyEvent; |
7 | use AnyEvent; |
24 | use AnyEvent::Handle; |
8 | use AnyEvent::Handle; |
25 | |
9 | |
26 | my $cv = AnyEvent->condvar; |
10 | my $cv = AnyEvent->condvar; |
27 | |
11 | |
28 | my $handle = |
12 | my $hdl; $hdl = new AnyEvent::Handle |
29 | AnyEvent::Handle->new ( |
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30 | fh => \*STDIN, |
13 | fh => \*STDIN, |
31 | on_eof => sub { |
14 | on_error => sub { |
32 | $cv->broadcast; |
15 | my ($hdl, $fatal, $msg) = @_; |
33 | }, |
16 | warn "got error $msg\n"; |
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17 | $hdl->destroy; |
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18 | $cv->send; |
34 | ); |
19 | }; |
35 | |
20 | |
36 | # send some request line |
21 | # send some request line |
37 | $handle->push_write ("getinfo\015\012"); |
22 | $hdl->push_write ("getinfo\015\012"); |
38 | |
23 | |
39 | # read the response line |
24 | # read the response line |
40 | $handle->push_read (line => sub { |
25 | $hdl->push_read (line => sub { |
41 | my ($handle, $line) = @_; |
26 | my ($hdl, $line) = @_; |
42 | warn "read line <$line>\n"; |
27 | warn "got line <$line>\n"; |
43 | $cv->send; |
28 | $cv->send; |
44 | }); |
29 | }); |
45 | |
30 | |
46 | $cv->recv; |
31 | $cv->recv; |
47 | |
32 | |
48 | =head1 DESCRIPTION |
33 | =head1 DESCRIPTION |
49 | |
34 | |
50 | This module is a helper module to make it easier to do event-based I/O on |
35 | This module is a helper module to make it easier to do event-based I/O on |
51 | filehandles. For utility functions for doing non-blocking connects and accepts |
36 | stream-based filehandles (sockets, pipes or other stream things). |
52 | on sockets see L<AnyEvent::Util>. |
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53 | |
37 | |
54 | The L<AnyEvent::Intro> tutorial contains some well-documented |
38 | The L<AnyEvent::Intro> tutorial contains some well-documented |
55 | AnyEvent::Handle examples. |
39 | AnyEvent::Handle examples. |
56 | |
40 | |
57 | In the following, when the documentation refers to of "bytes" then this |
41 | In the following, when the documentation refers to of "bytes" then this |
58 | means characters. As sysread and syswrite are used for all I/O, their |
42 | means characters. As sysread and syswrite are used for all I/O, their |
59 | treatment of characters applies to this module as well. |
43 | treatment of characters applies to this module as well. |
60 | |
44 | |
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45 | At the very minimum, you should specify C<fh> or C<connect>, and the |
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46 | C<on_error> callback. |
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47 | |
61 | All callbacks will be invoked with the handle object as their first |
48 | All callbacks will be invoked with the handle object as their first |
62 | argument. |
49 | argument. |
63 | |
50 | |
64 | =head2 SIGPIPE is not handled by this module |
51 | =cut |
65 | |
52 | |
66 | SIGPIPE is not handled by this module, so one of the practical |
53 | package AnyEvent::Handle; |
67 | requirements of using it is to ignore SIGPIPE (C<$SIG{PIPE} = |
54 | |
68 | 'IGNORE'>). At least, this is highly recommend in a networked program: If |
55 | use Scalar::Util (); |
69 | you use AnyEvent::Handle in a filter program (like sort), exiting on |
56 | use List::Util (); |
70 | SIGPIPE is probably the right thing to do. |
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 | } |
71 | |
79 | |
72 | =head1 METHODS |
80 | =head1 METHODS |
73 | |
81 | |
74 | =over 4 |
82 | =over 4 |
75 | |
83 | |
76 | =item B<new (%args)> |
84 | =item $handle = B<new> AnyEvent::Handle fh => $filehandle, key => value... |
77 | |
85 | |
78 | The constructor supports these arguments (all as key => value pairs). |
86 | The constructor supports these arguments (all as C<< key => value >> pairs). |
79 | |
87 | |
80 | =over 4 |
88 | =over 4 |
81 | |
89 | |
82 | =item fh => $filehandle [MANDATORY] |
90 | =item fh => $filehandle [C<fh> or C<connect> MANDATORY] |
83 | |
91 | |
84 | The filehandle this L<AnyEvent::Handle> object will operate on. |
92 | The filehandle this L<AnyEvent::Handle> object will operate on. |
85 | |
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86 | NOTE: The filehandle will be set to non-blocking mode (using |
93 | NOTE: The filehandle will be set to non-blocking mode (using |
87 | C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in |
94 | C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in |
88 | that mode. |
95 | that mode. |
89 | |
96 | |
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97 | =item connect => [$host, $service] [C<fh> or C<connect> MANDATORY] |
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98 | |
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99 | Try to connect to the specified host and service (port), using |
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100 | C<AnyEvent::Socket::tcp_connect>. The C<$host> additionally becomes the |
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101 | default C<peername>. |
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102 | |
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103 | You have to specify either this parameter, or C<fh>, above. |
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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 | |
90 | =item on_eof => $cb->($handle) |
114 | =item on_prepare => $cb->($handle) |
91 | |
115 | |
92 | Set the callback to be called when an end-of-file condition is detected, |
116 | This (rarely used) callback is called before a new connection is |
93 | i.e. in the case of a socket, when the other side has closed the |
117 | attempted, but after the file handle has been created. It could be used to |
94 | connection cleanly. |
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). |
95 | |
121 | |
96 | For sockets, this just means that the other side has stopped sending data, |
122 | The return value of this callback should be the connect timeout value in |
97 | you can still try to write data, and, in fact, one can return from the eof |
123 | seconds (or C<0>, or C<undef>, or the empty list, to indicate the default |
98 | callback and continue writing data, as only the read part has been shut |
124 | timeout is to be used). |
99 | down. |
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100 | |
125 | |
101 | While not mandatory, it is I<highly> recommended to set an eof callback, |
126 | =item on_connect => $cb->($handle, $host, $port, $retry->()) |
102 | otherwise you might end up with a closed socket while you are still |
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103 | waiting for data. |
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104 | |
127 | |
105 | If an EOF condition has been detected but no C<on_eof> callback has been |
128 | This callback is called when a connection has been successfully established. |
106 | set, then a fatal error will be raised with C<$!> set to <0>. |
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107 | |
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 | |
108 | =item on_error => $cb->($handle, $fatal) |
153 | =item on_error => $cb->($handle, $fatal, $message) |
109 | |
154 | |
110 | This is the error callback, which is called when, well, some error |
155 | This is the error callback, which is called when, well, some error |
111 | occured, such as not being able to resolve the hostname, failure to |
156 | occured, such as not being able to resolve the hostname, failure to |
112 | connect or a read error. |
157 | connect or a read error. |
113 | |
158 | |
114 | Some errors are fatal (which is indicated by C<$fatal> being true). On |
159 | Some errors are fatal (which is indicated by C<$fatal> being true). On |
115 | fatal errors the handle object will be shut down and will not be usable |
160 | fatal errors the handle object will be destroyed (by a call to C<< -> |
116 | (but you are free to look at the current C<< ->rbuf >>). Examples of fatal |
161 | destroy >>) after invoking the error callback (which means you are free to |
117 | errors are an EOF condition with active (but unsatisifable) read watchers |
162 | examine the handle object). Examples of fatal errors are an EOF condition |
118 | (C<EPIPE>) or I/O errors. |
163 | with active (but unsatisifable) read watchers (C<EPIPE>) or I/O errors. In |
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164 | cases where the other side can close the connection at their will it is |
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165 | often easiest to not report C<EPIPE> errors in this callback. |
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166 | |
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167 | AnyEvent::Handle tries to find an appropriate error code for you to check |
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168 | against, but in some cases (TLS errors), this does not work well. It is |
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169 | recommended to always output the C<$message> argument in human-readable |
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170 | error messages (it's usually the same as C<"$!">). |
119 | |
171 | |
120 | Non-fatal errors can be retried by simply returning, but it is recommended |
172 | Non-fatal errors can be retried by simply returning, but it is recommended |
121 | to simply ignore this parameter and instead abondon the handle object |
173 | to simply ignore this parameter and instead abondon the handle object |
122 | when this callback is invoked. Examples of non-fatal errors are timeouts |
174 | when this callback is invoked. Examples of non-fatal errors are timeouts |
123 | C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>). |
175 | C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>). |
124 | |
176 | |
125 | On callback entrance, the value of C<$!> contains the operating system |
177 | On callback entrance, the value of C<$!> contains the operating system |
126 | error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>). |
178 | error code (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT>, C<EBADMSG> or |
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179 | C<EPROTO>). |
127 | |
180 | |
128 | While not mandatory, it is I<highly> recommended to set this callback, as |
181 | While not mandatory, it is I<highly> recommended to set this callback, as |
129 | you will not be notified of errors otherwise. The default simply calls |
182 | you will not be notified of errors otherwise. The default simply calls |
130 | C<croak>. |
183 | C<croak>. |
131 | |
184 | |
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135 | and no read request is in the queue (unlike read queue callbacks, this |
188 | and no read request is in the queue (unlike read queue callbacks, this |
136 | callback will only be called when at least one octet of data is in the |
189 | callback will only be called when at least one octet of data is in the |
137 | read buffer). |
190 | read buffer). |
138 | |
191 | |
139 | To access (and remove data from) the read buffer, use the C<< ->rbuf >> |
192 | To access (and remove data from) the read buffer, use the C<< ->rbuf >> |
140 | method or access the C<$handle->{rbuf}> member directly. |
193 | method or access the C<< $handle->{rbuf} >> member directly. Note that you |
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194 | must not enlarge or modify the read buffer, you can only remove data at |
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195 | the beginning from it. |
141 | |
196 | |
142 | When an EOF condition is detected then AnyEvent::Handle will first try to |
197 | When an EOF condition is detected then AnyEvent::Handle will first try to |
143 | feed all the remaining data to the queued callbacks and C<on_read> before |
198 | feed all the remaining data to the queued callbacks and C<on_read> before |
144 | calling the C<on_eof> callback. If no progress can be made, then a fatal |
199 | calling the C<on_eof> callback. If no progress can be made, then a fatal |
145 | error will be raised (with C<$!> set to C<EPIPE>). |
200 | error will be raised (with C<$!> set to C<EPIPE>). |
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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>. |
146 | |
222 | |
147 | =item on_drain => $cb->($handle) |
223 | =item on_drain => $cb->($handle) |
148 | |
224 | |
149 | 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 |
150 | (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). |
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157 | memory and push it into the queue, but instead only read more data from |
233 | memory and push it into the queue, but instead only read more data from |
158 | the file when the write queue becomes empty. |
234 | the file when the write queue becomes empty. |
159 | |
235 | |
160 | =item timeout => $fractional_seconds |
236 | =item timeout => $fractional_seconds |
161 | |
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 | |
162 | If non-zero, then this enables an "inactivity" timeout: whenever this many |
242 | If non-zero, then these enables an "inactivity" timeout: whenever this |
163 | seconds pass without a successful read or write on the underlying file |
243 | many seconds pass without a successful read or write on the underlying |
164 | handle, the C<on_timeout> callback will be invoked (and if that one is |
244 | file handle (or a call to C<timeout_reset>), the C<on_timeout> callback |
165 | missing, a non-fatal C<ETIMEDOUT> error will be raised). |
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>. |
166 | |
253 | |
167 | Note that timeout processing is also active when you currently do not have |
254 | Note that timeout processing is also active when you currently do not have |
168 | any outstanding read or write requests: If you plan to keep the connection |
255 | any outstanding read or write requests: If you plan to keep the connection |
169 | idle then you should disable the timout temporarily or ignore the timeout |
256 | idle then you should disable the timout temporarily or ignore the timeout |
170 | in the C<on_timeout> callback, in which case AnyEvent::Handle will simply |
257 | in the C<on_timeout> callback, in which case AnyEvent::Handle will simply |
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214 | accomplishd by setting this option to a true value. |
301 | accomplishd by setting this option to a true value. |
215 | |
302 | |
216 | The default is your opertaing system's default behaviour (most likely |
303 | The default is your opertaing system's default behaviour (most likely |
217 | enabled), this option explicitly enables or disables it, if possible. |
304 | enabled), this option explicitly enables or disables it, if possible. |
218 | |
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 | |
219 | =item read_size => <bytes> |
338 | =item read_size => <bytes> |
220 | |
339 | |
221 | The default read block size (the amount of bytes this module will |
340 | The default read block size (the amount of bytes this module will |
222 | try to read during each loop iteration, which affects memory |
341 | try to read during each loop iteration, which affects memory |
223 | requirements). Default: C<8192>. |
342 | requirements). Default: C<8192>. |
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243 | |
362 | |
244 | This will not work for partial TLS data that could not be encoded |
363 | This will not work for partial TLS data that could not be encoded |
245 | yet. This data will be lost. Calling the C<stoptls> method in time might |
364 | yet. This data will be lost. Calling the C<stoptls> method in time might |
246 | help. |
365 | help. |
247 | |
366 | |
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367 | =item peername => $string |
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368 | |
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369 | A string used to identify the remote site - usually the DNS hostname |
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370 | (I<not> IDN!) used to create the connection, rarely the IP address. |
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371 | |
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372 | Apart from being useful in error messages, this string is also used in TLS |
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373 | peername verification (see C<verify_peername> in L<AnyEvent::TLS>). This |
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374 | verification will be skipped when C<peername> is not specified or |
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375 | C<undef>. |
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376 | |
248 | =item tls => "accept" | "connect" | Net::SSLeay::SSL object |
377 | =item tls => "accept" | "connect" | Net::SSLeay::SSL object |
249 | |
378 | |
250 | When this parameter is given, it enables TLS (SSL) mode, that means |
379 | When this parameter is given, it enables TLS (SSL) mode, that means |
251 | AnyEvent will start a TLS handshake as soon as the conenction has been |
380 | AnyEvent will start a TLS handshake as soon as the connection has been |
252 | established and will transparently encrypt/decrypt data afterwards. |
381 | established and will transparently encrypt/decrypt data afterwards. |
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382 | |
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383 | All TLS protocol errors will be signalled as C<EPROTO>, with an |
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384 | appropriate error message. |
253 | |
385 | |
254 | 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 |
255 | automatically when you try to create a TLS handle): this module doesn't |
387 | automatically when you try to create a TLS handle): this module doesn't |
256 | have a dependency on that module, so if your module requires it, you have |
388 | have a dependency on that module, so if your module requires it, you have |
257 | to add the dependency yourself. |
389 | to add the dependency yourself. |
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261 | mode. |
393 | mode. |
262 | |
394 | |
263 | 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 |
264 | 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> |
265 | 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 |
266 | AnyEvent::Handle. |
398 | AnyEvent::Handle. Also, this module will take ownership of this connection |
|
|
399 | object. |
|
|
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. |
267 | |
409 | |
268 | See the C<< ->starttls >> method for when need to start TLS negotiation later. |
410 | See the C<< ->starttls >> method for when need to start TLS negotiation later. |
269 | |
411 | |
270 | =item tls_ctx => $ssl_ctx |
412 | =item tls_ctx => $anyevent_tls |
271 | |
413 | |
272 | Use the given C<Net::SSLeay::CTX> object to create the new TLS connection |
414 | Use the given C<AnyEvent::TLS> object to create the new TLS connection |
273 | (unless a connection object was specified directly). If this parameter is |
415 | (unless a connection object was specified directly). If this parameter is |
274 | missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>. |
416 | missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>. |
|
|
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. |
275 | |
453 | |
276 | =item json => JSON or JSON::XS object |
454 | =item json => JSON or JSON::XS object |
277 | |
455 | |
278 | This is the json coder object used by the C<json> read and write types. |
456 | This is the json coder object used by the C<json> read and write types. |
279 | |
457 | |
… | |
… | |
288 | |
466 | |
289 | =cut |
467 | =cut |
290 | |
468 | |
291 | sub new { |
469 | sub new { |
292 | my $class = shift; |
470 | my $class = shift; |
293 | |
|
|
294 | my $self = bless { @_ }, $class; |
471 | my $self = bless { @_ }, $class; |
295 | |
472 | |
296 | $self->{fh} or Carp::croak "mandatory argument fh is missing"; |
473 | if ($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) = @_; |
|
|
536 | |
|
|
537 | # too many clueless people try to use udp and similar sockets |
|
|
538 | # with AnyEvent::Handle, do them a favour. |
|
|
539 | my $type = getsockopt $self->{fh}, Socket::SOL_SOCKET (), Socket::SO_TYPE (); |
|
|
540 | Carp::croak "AnyEvent::Handle: only stream sockets supported, anything else will NOT work!" |
|
|
541 | if Socket::SOCK_STREAM () != (unpack "I", $type) && defined $type; |
297 | |
542 | |
298 | AnyEvent::Util::fh_nonblocking $self->{fh}, 1; |
543 | AnyEvent::Util::fh_nonblocking $self->{fh}, 1; |
299 | |
544 | |
|
|
545 | $self->{_activity} = |
|
|
546 | $self->{_ractivity} = |
|
|
547 | $self->{_wactivity} = AE::now; |
|
|
548 | |
|
|
549 | $self->timeout (delete $self->{timeout} ) if $self->{timeout}; |
|
|
550 | $self->rtimeout (delete $self->{rtimeout} ) if $self->{rtimeout}; |
|
|
551 | $self->wtimeout (delete $self->{wtimeout} ) if $self->{wtimeout}; |
|
|
552 | |
|
|
553 | $self->no_delay (delete $self->{no_delay} ) if exists $self->{no_delay} && $self->{no_delay}; |
|
|
554 | $self->keepalive (delete $self->{keepalive}) if exists $self->{keepalive} && $self->{keepalive}; |
|
|
555 | |
|
|
556 | $self->oobinline (exists $self->{oobinline} ? delete $self->{oobinline} : 1); |
|
|
557 | |
300 | $self->starttls (delete $self->{tls}, delete $self->{tls_ctx}) |
558 | $self->starttls (delete $self->{tls}, delete $self->{tls_ctx}) |
301 | if $self->{tls}; |
559 | if $self->{tls}; |
302 | |
560 | |
303 | $self->{_activity} = AnyEvent->now; |
|
|
304 | $self->_timeout; |
|
|
305 | |
|
|
306 | $self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain}; |
561 | $self->on_drain (delete $self->{on_drain}) if $self->{on_drain}; |
307 | $self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay}; |
|
|
308 | |
562 | |
309 | $self->start_read |
563 | $self->start_read |
310 | if $self->{on_read}; |
564 | if $self->{on_read} || @{ $self->{_queue} }; |
311 | |
565 | |
312 | $self |
566 | $self->_drain_wbuf; |
313 | } |
|
|
314 | |
|
|
315 | sub _shutdown { |
|
|
316 | my ($self) = @_; |
|
|
317 | |
|
|
318 | delete $self->{_tw}; |
|
|
319 | delete $self->{_rw}; |
|
|
320 | delete $self->{_ww}; |
|
|
321 | delete $self->{fh}; |
|
|
322 | |
|
|
323 | &_freetls; |
|
|
324 | |
|
|
325 | delete $self->{on_read}; |
|
|
326 | delete $self->{_queue}; |
|
|
327 | } |
567 | } |
328 | |
568 | |
329 | sub _error { |
569 | sub _error { |
330 | my ($self, $errno, $fatal) = @_; |
570 | my ($self, $errno, $fatal, $message) = @_; |
331 | |
|
|
332 | $self->_shutdown |
|
|
333 | if $fatal; |
|
|
334 | |
571 | |
335 | $! = $errno; |
572 | $! = $errno; |
|
|
573 | $message ||= "$!"; |
336 | |
574 | |
337 | if ($self->{on_error}) { |
575 | if ($self->{on_error}) { |
338 | $self->{on_error}($self, $fatal); |
576 | $self->{on_error}($self, $fatal, $message); |
339 | } else { |
577 | $self->destroy if $fatal; |
|
|
578 | } elsif ($self->{fh} || $self->{connect}) { |
|
|
579 | $self->destroy; |
340 | Carp::croak "AnyEvent::Handle uncaught error: $!"; |
580 | Carp::croak "AnyEvent::Handle uncaught error: $message"; |
341 | } |
581 | } |
342 | } |
582 | } |
343 | |
583 | |
344 | =item $fh = $handle->fh |
584 | =item $fh = $handle->fh |
345 | |
585 | |
… | |
… | |
369 | $_[0]{on_eof} = $_[1]; |
609 | $_[0]{on_eof} = $_[1]; |
370 | } |
610 | } |
371 | |
611 | |
372 | =item $handle->on_timeout ($cb) |
612 | =item $handle->on_timeout ($cb) |
373 | |
613 | |
374 | Replace the current C<on_timeout> callback, or disables the callback (but |
614 | =item $handle->on_rtimeout ($cb) |
375 | not the timeout) if C<$cb> = C<undef>. See the C<timeout> constructor |
|
|
376 | argument and method. |
|
|
377 | |
615 | |
378 | =cut |
616 | =item $handle->on_wtimeout ($cb) |
379 | |
617 | |
380 | sub on_timeout { |
618 | Replace the current C<on_timeout>, C<on_rtimeout> or C<on_wtimeout> |
381 | $_[0]{on_timeout} = $_[1]; |
619 | callback, or disables the callback (but not the timeout) if C<$cb> = |
382 | } |
620 | C<undef>. See the C<timeout> constructor argument and method. |
|
|
621 | |
|
|
622 | =cut |
|
|
623 | |
|
|
624 | # see below |
383 | |
625 | |
384 | =item $handle->autocork ($boolean) |
626 | =item $handle->autocork ($boolean) |
385 | |
627 | |
386 | Enables or disables the current autocork behaviour (see C<autocork> |
628 | Enables or disables the current autocork behaviour (see C<autocork> |
387 | constructor argument). |
629 | constructor argument). Changes will only take effect on the next write. |
388 | |
630 | |
389 | =cut |
631 | =cut |
|
|
632 | |
|
|
633 | sub autocork { |
|
|
634 | $_[0]{autocork} = $_[1]; |
|
|
635 | } |
390 | |
636 | |
391 | =item $handle->no_delay ($boolean) |
637 | =item $handle->no_delay ($boolean) |
392 | |
638 | |
393 | Enables or disables the C<no_delay> setting (see constructor argument of |
639 | Enables or disables the C<no_delay> setting (see constructor argument of |
394 | the same name for details). |
640 | the same name for details). |
… | |
… | |
398 | sub no_delay { |
644 | sub no_delay { |
399 | $_[0]{no_delay} = $_[1]; |
645 | $_[0]{no_delay} = $_[1]; |
400 | |
646 | |
401 | eval { |
647 | eval { |
402 | local $SIG{__DIE__}; |
648 | local $SIG{__DIE__}; |
403 | setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1]; |
649 | setsockopt $_[0]{fh}, Socket::IPPROTO_TCP (), Socket::TCP_NODELAY (), int $_[1] |
|
|
650 | if $_[0]{fh}; |
404 | }; |
651 | }; |
405 | } |
652 | } |
406 | |
653 | |
|
|
654 | =item $handle->keepalive ($boolean) |
|
|
655 | |
|
|
656 | Enables or disables the C<keepalive> setting (see constructor argument of |
|
|
657 | the same name for details). |
|
|
658 | |
|
|
659 | =cut |
|
|
660 | |
|
|
661 | sub keepalive { |
|
|
662 | $_[0]{keepalive} = $_[1]; |
|
|
663 | |
|
|
664 | eval { |
|
|
665 | local $SIG{__DIE__}; |
|
|
666 | setsockopt $_[0]{fh}, Socket::SOL_SOCKET (), Socket::SO_KEEPALIVE (), int $_[1] |
|
|
667 | if $_[0]{fh}; |
|
|
668 | }; |
|
|
669 | } |
|
|
670 | |
|
|
671 | =item $handle->oobinline ($boolean) |
|
|
672 | |
|
|
673 | Enables or disables the C<oobinline> setting (see constructor argument of |
|
|
674 | the same name for details). |
|
|
675 | |
|
|
676 | =cut |
|
|
677 | |
|
|
678 | sub oobinline { |
|
|
679 | $_[0]{oobinline} = $_[1]; |
|
|
680 | |
|
|
681 | eval { |
|
|
682 | local $SIG{__DIE__}; |
|
|
683 | setsockopt $_[0]{fh}, Socket::SOL_SOCKET (), Socket::SO_OOBINLINE (), int $_[1] |
|
|
684 | if $_[0]{fh}; |
|
|
685 | }; |
|
|
686 | } |
|
|
687 | |
|
|
688 | =item $handle->keepalive ($boolean) |
|
|
689 | |
|
|
690 | Enables or disables the C<keepalive> setting (see constructor argument of |
|
|
691 | the same name for details). |
|
|
692 | |
|
|
693 | =cut |
|
|
694 | |
|
|
695 | sub keepalive { |
|
|
696 | $_[0]{keepalive} = $_[1]; |
|
|
697 | |
|
|
698 | eval { |
|
|
699 | local $SIG{__DIE__}; |
|
|
700 | setsockopt $_[0]{fh}, Socket::SOL_SOCKET (), Socket::SO_KEEPALIVE (), int $_[1] |
|
|
701 | if $_[0]{fh}; |
|
|
702 | }; |
|
|
703 | } |
|
|
704 | |
|
|
705 | =item $handle->on_starttls ($cb) |
|
|
706 | |
|
|
707 | Replace the current C<on_starttls> callback (see the C<on_starttls> constructor argument). |
|
|
708 | |
|
|
709 | =cut |
|
|
710 | |
|
|
711 | sub on_starttls { |
|
|
712 | $_[0]{on_starttls} = $_[1]; |
|
|
713 | } |
|
|
714 | |
|
|
715 | =item $handle->on_stoptls ($cb) |
|
|
716 | |
|
|
717 | Replace the current C<on_stoptls> callback (see the C<on_stoptls> constructor argument). |
|
|
718 | |
|
|
719 | =cut |
|
|
720 | |
|
|
721 | sub on_stoptls { |
|
|
722 | $_[0]{on_stoptls} = $_[1]; |
|
|
723 | } |
|
|
724 | |
|
|
725 | =item $handle->rbuf_max ($max_octets) |
|
|
726 | |
|
|
727 | Configures the C<rbuf_max> setting (C<undef> disables it). |
|
|
728 | |
|
|
729 | =cut |
|
|
730 | |
|
|
731 | sub rbuf_max { |
|
|
732 | $_[0]{rbuf_max} = $_[1]; |
|
|
733 | } |
|
|
734 | |
407 | ############################################################################# |
735 | ############################################################################# |
408 | |
736 | |
409 | =item $handle->timeout ($seconds) |
737 | =item $handle->timeout ($seconds) |
410 | |
738 | |
|
|
739 | =item $handle->rtimeout ($seconds) |
|
|
740 | |
|
|
741 | =item $handle->wtimeout ($seconds) |
|
|
742 | |
411 | Configures (or disables) the inactivity timeout. |
743 | Configures (or disables) the inactivity timeout. |
412 | |
744 | |
413 | =cut |
745 | =item $handle->timeout_reset |
414 | |
746 | |
415 | sub timeout { |
747 | =item $handle->rtimeout_reset |
|
|
748 | |
|
|
749 | =item $handle->wtimeout_reset |
|
|
750 | |
|
|
751 | Reset the activity timeout, as if data was received or sent. |
|
|
752 | |
|
|
753 | These methods are cheap to call. |
|
|
754 | |
|
|
755 | =cut |
|
|
756 | |
|
|
757 | for my $dir ("", "r", "w") { |
|
|
758 | my $timeout = "${dir}timeout"; |
|
|
759 | my $tw = "_${dir}tw"; |
|
|
760 | my $on_timeout = "on_${dir}timeout"; |
|
|
761 | my $activity = "_${dir}activity"; |
|
|
762 | my $cb; |
|
|
763 | |
|
|
764 | *$on_timeout = sub { |
|
|
765 | $_[0]{$on_timeout} = $_[1]; |
|
|
766 | }; |
|
|
767 | |
|
|
768 | *$timeout = sub { |
416 | my ($self, $timeout) = @_; |
769 | my ($self, $new_value) = @_; |
417 | |
770 | |
418 | $self->{timeout} = $timeout; |
771 | $self->{$timeout} = $new_value; |
419 | $self->_timeout; |
772 | delete $self->{$tw}; &$cb; |
420 | } |
773 | }; |
421 | |
774 | |
|
|
775 | *{"${dir}timeout_reset"} = sub { |
|
|
776 | $_[0]{$activity} = AE::now; |
|
|
777 | }; |
|
|
778 | |
|
|
779 | # main workhorse: |
422 | # reset the timeout watcher, as neccessary |
780 | # reset the timeout watcher, as neccessary |
423 | # also check for time-outs |
781 | # also check for time-outs |
424 | sub _timeout { |
782 | $cb = sub { |
425 | my ($self) = @_; |
783 | my ($self) = @_; |
426 | |
784 | |
427 | if ($self->{timeout}) { |
785 | if ($self->{$timeout} && $self->{fh}) { |
428 | my $NOW = AnyEvent->now; |
786 | my $NOW = AE::now; |
429 | |
787 | |
430 | # when would the timeout trigger? |
788 | # when would the timeout trigger? |
431 | my $after = $self->{_activity} + $self->{timeout} - $NOW; |
789 | my $after = $self->{$activity} + $self->{$timeout} - $NOW; |
432 | |
790 | |
433 | # now or in the past already? |
791 | # now or in the past already? |
434 | if ($after <= 0) { |
792 | if ($after <= 0) { |
435 | $self->{_activity} = $NOW; |
793 | $self->{$activity} = $NOW; |
436 | |
794 | |
437 | if ($self->{on_timeout}) { |
795 | if ($self->{$on_timeout}) { |
438 | $self->{on_timeout}($self); |
796 | $self->{$on_timeout}($self); |
439 | } else { |
797 | } else { |
440 | $self->_error (&Errno::ETIMEDOUT); |
798 | $self->_error (Errno::ETIMEDOUT); |
|
|
799 | } |
|
|
800 | |
|
|
801 | # callback could have changed timeout value, optimise |
|
|
802 | return unless $self->{$timeout}; |
|
|
803 | |
|
|
804 | # calculate new after |
|
|
805 | $after = $self->{$timeout}; |
441 | } |
806 | } |
442 | |
807 | |
443 | # callback could have changed timeout value, optimise |
808 | Scalar::Util::weaken $self; |
444 | return unless $self->{timeout}; |
809 | return unless $self; # ->error could have destroyed $self |
445 | |
810 | |
446 | # calculate new after |
811 | $self->{$tw} ||= AE::timer $after, 0, sub { |
447 | $after = $self->{timeout}; |
812 | delete $self->{$tw}; |
|
|
813 | $cb->($self); |
|
|
814 | }; |
|
|
815 | } else { |
|
|
816 | delete $self->{$tw}; |
448 | } |
817 | } |
449 | |
|
|
450 | Scalar::Util::weaken $self; |
|
|
451 | return unless $self; # ->error could have destroyed $self |
|
|
452 | |
|
|
453 | $self->{_tw} ||= AnyEvent->timer (after => $after, cb => sub { |
|
|
454 | delete $self->{_tw}; |
|
|
455 | $self->_timeout; |
|
|
456 | }); |
|
|
457 | } else { |
|
|
458 | delete $self->{_tw}; |
|
|
459 | } |
818 | } |
460 | } |
819 | } |
461 | |
820 | |
462 | ############################################################################# |
821 | ############################################################################# |
463 | |
822 | |
… | |
… | |
478 | |
837 | |
479 | =item $handle->on_drain ($cb) |
838 | =item $handle->on_drain ($cb) |
480 | |
839 | |
481 | Sets the C<on_drain> callback or clears it (see the description of |
840 | Sets the C<on_drain> callback or clears it (see the description of |
482 | C<on_drain> in the constructor). |
841 | C<on_drain> in the constructor). |
|
|
842 | |
|
|
843 | This method may invoke callbacks (and therefore the handle might be |
|
|
844 | destroyed after it returns). |
483 | |
845 | |
484 | =cut |
846 | =cut |
485 | |
847 | |
486 | sub on_drain { |
848 | sub on_drain { |
487 | my ($self, $cb) = @_; |
849 | my ($self, $cb) = @_; |
… | |
… | |
496 | |
858 | |
497 | Queues the given scalar to be written. You can push as much data as you |
859 | Queues the given scalar to be written. You can push as much data as you |
498 | want (only limited by the available memory), as C<AnyEvent::Handle> |
860 | want (only limited by the available memory), as C<AnyEvent::Handle> |
499 | buffers it independently of the kernel. |
861 | buffers it independently of the kernel. |
500 | |
862 | |
|
|
863 | This method may invoke callbacks (and therefore the handle might be |
|
|
864 | destroyed after it returns). |
|
|
865 | |
501 | =cut |
866 | =cut |
502 | |
867 | |
503 | sub _drain_wbuf { |
868 | sub _drain_wbuf { |
504 | my ($self) = @_; |
869 | my ($self) = @_; |
505 | |
870 | |
… | |
… | |
508 | Scalar::Util::weaken $self; |
873 | Scalar::Util::weaken $self; |
509 | |
874 | |
510 | my $cb = sub { |
875 | my $cb = sub { |
511 | my $len = syswrite $self->{fh}, $self->{wbuf}; |
876 | my $len = syswrite $self->{fh}, $self->{wbuf}; |
512 | |
877 | |
513 | if ($len >= 0) { |
878 | if (defined $len) { |
514 | substr $self->{wbuf}, 0, $len, ""; |
879 | substr $self->{wbuf}, 0, $len, ""; |
515 | |
880 | |
516 | $self->{_activity} = AnyEvent->now; |
881 | $self->{_activity} = $self->{_wactivity} = AE::now; |
517 | |
882 | |
518 | $self->{on_drain}($self) |
883 | $self->{on_drain}($self) |
519 | if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf}) |
884 | if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf}) |
520 | && $self->{on_drain}; |
885 | && $self->{on_drain}; |
521 | |
886 | |
… | |
… | |
527 | |
892 | |
528 | # try to write data immediately |
893 | # try to write data immediately |
529 | $cb->() unless $self->{autocork}; |
894 | $cb->() unless $self->{autocork}; |
530 | |
895 | |
531 | # if still data left in wbuf, we need to poll |
896 | # if still data left in wbuf, we need to poll |
532 | $self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb) |
897 | $self->{_ww} = AE::io $self->{fh}, 1, $cb |
533 | if length $self->{wbuf}; |
898 | if length $self->{wbuf}; |
534 | }; |
899 | }; |
535 | } |
900 | } |
536 | |
901 | |
537 | our %WH; |
902 | our %WH; |
538 | |
903 | |
|
|
904 | # deprecated |
539 | sub register_write_type($$) { |
905 | sub register_write_type($$) { |
540 | $WH{$_[0]} = $_[1]; |
906 | $WH{$_[0]} = $_[1]; |
541 | } |
907 | } |
542 | |
908 | |
543 | sub push_write { |
909 | sub push_write { |
544 | my $self = shift; |
910 | my $self = shift; |
545 | |
911 | |
546 | if (@_ > 1) { |
912 | if (@_ > 1) { |
547 | my $type = shift; |
913 | my $type = shift; |
548 | |
914 | |
|
|
915 | @_ = ($WH{$type} ||= _load_func "$type\::anyevent_write_type" |
549 | @_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write") |
916 | or Carp::croak "unsupported/unloadable type '$type' passed to AnyEvent::Handle::push_write") |
550 | ->($self, @_); |
917 | ->($self, @_); |
551 | } |
918 | } |
552 | |
919 | |
|
|
920 | # we downgrade here to avoid hard-to-track-down bugs, |
|
|
921 | # and diagnose the problem earlier and better. |
|
|
922 | |
553 | if ($self->{tls}) { |
923 | if ($self->{tls}) { |
554 | $self->{_tls_wbuf} .= $_[0]; |
924 | utf8::downgrade $self->{_tls_wbuf} .= $_[0]; |
555 | &_dotls ($self); |
925 | &_dotls ($self) if $self->{fh}; |
556 | } else { |
926 | } else { |
557 | $self->{wbuf} .= $_[0]; |
927 | utf8::downgrade $self->{wbuf} .= $_[0]; |
558 | $self->_drain_wbuf; |
928 | $self->_drain_wbuf if $self->{fh}; |
559 | } |
929 | } |
560 | } |
930 | } |
561 | |
931 | |
562 | =item $handle->push_write (type => @args) |
932 | =item $handle->push_write (type => @args) |
563 | |
933 | |
564 | Instead of formatting your data yourself, you can also let this module do |
934 | Instead of formatting your data yourself, you can also let this module |
565 | the job by specifying a type and type-specific arguments. |
935 | do the job by specifying a type and type-specific arguments. You |
|
|
936 | can also specify the (fully qualified) name of a package, in which |
|
|
937 | case AnyEvent tries to load the package and then expects to find the |
|
|
938 | C<anyevent_read_type> function inside (see "custom write types", below). |
566 | |
939 | |
567 | Predefined types are (if you have ideas for additional types, feel free to |
940 | Predefined types are (if you have ideas for additional types, feel free to |
568 | drop by and tell us): |
941 | drop by and tell us): |
569 | |
942 | |
570 | =over 4 |
943 | =over 4 |
… | |
… | |
577 | =cut |
950 | =cut |
578 | |
951 | |
579 | register_write_type netstring => sub { |
952 | register_write_type netstring => sub { |
580 | my ($self, $string) = @_; |
953 | my ($self, $string) = @_; |
581 | |
954 | |
582 | sprintf "%d:%s,", (length $string), $string |
955 | (length $string) . ":$string," |
583 | }; |
956 | }; |
584 | |
957 | |
585 | =item packstring => $format, $data |
958 | =item packstring => $format, $data |
586 | |
959 | |
587 | An octet string prefixed with an encoded length. The encoding C<$format> |
960 | An octet string prefixed with an encoded length. The encoding C<$format> |
… | |
… | |
627 | Other languages could read single lines terminated by a newline and pass |
1000 | Other languages could read single lines terminated by a newline and pass |
628 | this line into their JSON decoder of choice. |
1001 | this line into their JSON decoder of choice. |
629 | |
1002 | |
630 | =cut |
1003 | =cut |
631 | |
1004 | |
|
|
1005 | sub json_coder() { |
|
|
1006 | eval { require JSON::XS; JSON::XS->new->utf8 } |
|
|
1007 | || do { require JSON; JSON->new->utf8 } |
|
|
1008 | } |
|
|
1009 | |
632 | register_write_type json => sub { |
1010 | register_write_type json => sub { |
633 | my ($self, $ref) = @_; |
1011 | my ($self, $ref) = @_; |
634 | |
1012 | |
635 | require JSON; |
1013 | my $json = $self->{json} ||= json_coder; |
636 | |
1014 | |
637 | $self->{json} ? $self->{json}->encode ($ref) |
1015 | $json->encode ($ref) |
638 | : JSON::encode_json ($ref) |
|
|
639 | }; |
1016 | }; |
640 | |
1017 | |
641 | =item storable => $reference |
1018 | =item storable => $reference |
642 | |
1019 | |
643 | Freezes the given reference using L<Storable> and writes it to the |
1020 | Freezes the given reference using L<Storable> and writes it to the |
… | |
… | |
653 | pack "w/a*", Storable::nfreeze ($ref) |
1030 | pack "w/a*", Storable::nfreeze ($ref) |
654 | }; |
1031 | }; |
655 | |
1032 | |
656 | =back |
1033 | =back |
657 | |
1034 | |
658 | =item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args) |
1035 | =item $handle->push_shutdown |
659 | |
1036 | |
660 | This function (not method) lets you add your own types to C<push_write>. |
1037 | Sometimes you know you want to close the socket after writing your data |
|
|
1038 | before it was actually written. One way to do that is to replace your |
|
|
1039 | C<on_drain> handler by a callback that shuts down the socket (and set |
|
|
1040 | C<low_water_mark> to C<0>). This method is a shorthand for just that, and |
|
|
1041 | replaces the C<on_drain> callback with: |
|
|
1042 | |
|
|
1043 | sub { shutdown $_[0]{fh}, 1 } # for push_shutdown |
|
|
1044 | |
|
|
1045 | This simply shuts down the write side and signals an EOF condition to the |
|
|
1046 | the peer. |
|
|
1047 | |
|
|
1048 | You can rely on the normal read queue and C<on_eof> handling |
|
|
1049 | afterwards. This is the cleanest way to close a connection. |
|
|
1050 | |
|
|
1051 | This method may invoke callbacks (and therefore the handle might be |
|
|
1052 | destroyed after it returns). |
|
|
1053 | |
|
|
1054 | =cut |
|
|
1055 | |
|
|
1056 | sub push_shutdown { |
|
|
1057 | my ($self) = @_; |
|
|
1058 | |
|
|
1059 | delete $self->{low_water_mark}; |
|
|
1060 | $self->on_drain (sub { shutdown $_[0]{fh}, 1 }); |
|
|
1061 | } |
|
|
1062 | |
|
|
1063 | =item custom write types - Package::anyevent_write_type $handle, @args |
|
|
1064 | |
|
|
1065 | Instead of one of the predefined types, you can also specify the name of |
|
|
1066 | a package. AnyEvent will try to load the package and then expects to find |
|
|
1067 | a function named C<anyevent_write_type> inside. If it isn't found, it |
|
|
1068 | progressively tries to load the parent package until it either finds the |
|
|
1069 | function (good) or runs out of packages (bad). |
|
|
1070 | |
661 | Whenever the given C<type> is used, C<push_write> will invoke the code |
1071 | Whenever the given C<type> is used, C<push_write> will the function with |
662 | reference with the handle object and the remaining arguments. |
1072 | the handle object and the remaining arguments. |
663 | |
1073 | |
664 | The code reference is supposed to return a single octet string that will |
1074 | The function is supposed to return a single octet string that will be |
665 | be appended to the write buffer. |
1075 | appended to the write buffer, so you cna mentally treat this function as a |
|
|
1076 | "arguments to on-the-wire-format" converter. |
666 | |
1077 | |
667 | Note that this is a function, and all types registered this way will be |
1078 | Example: implement a custom write type C<join> that joins the remaining |
668 | global, so try to use unique names. |
1079 | arguments using the first one. |
|
|
1080 | |
|
|
1081 | $handle->push_write (My::Type => " ", 1,2,3); |
|
|
1082 | |
|
|
1083 | # uses the following package, which can be defined in the "My::Type" or in |
|
|
1084 | # the "My" modules to be auto-loaded, or just about anywhere when the |
|
|
1085 | # My::Type::anyevent_write_type is defined before invoking it. |
|
|
1086 | |
|
|
1087 | package My::Type; |
|
|
1088 | |
|
|
1089 | sub anyevent_write_type { |
|
|
1090 | my ($handle, $delim, @args) = @_; |
|
|
1091 | |
|
|
1092 | join $delim, @args |
|
|
1093 | } |
669 | |
1094 | |
670 | =cut |
1095 | =cut |
671 | |
1096 | |
672 | ############################################################################# |
1097 | ############################################################################# |
673 | |
1098 | |
… | |
… | |
755 | =cut |
1180 | =cut |
756 | |
1181 | |
757 | sub _drain_rbuf { |
1182 | sub _drain_rbuf { |
758 | my ($self) = @_; |
1183 | my ($self) = @_; |
759 | |
1184 | |
|
|
1185 | # avoid recursion |
|
|
1186 | return if $self->{_skip_drain_rbuf}; |
760 | local $self->{_in_drain} = 1; |
1187 | local $self->{_skip_drain_rbuf} = 1; |
761 | |
|
|
762 | if ( |
|
|
763 | defined $self->{rbuf_max} |
|
|
764 | && $self->{rbuf_max} < length $self->{rbuf} |
|
|
765 | ) { |
|
|
766 | $self->_error (&Errno::ENOSPC, 1), return; |
|
|
767 | } |
|
|
768 | |
1188 | |
769 | while () { |
1189 | while () { |
|
|
1190 | # we need to use a separate tls read buffer, as we must not receive data while |
|
|
1191 | # we are draining the buffer, and this can only happen with TLS. |
|
|
1192 | $self->{rbuf} .= delete $self->{_tls_rbuf} |
|
|
1193 | if exists $self->{_tls_rbuf}; |
|
|
1194 | |
770 | my $len = length $self->{rbuf}; |
1195 | my $len = length $self->{rbuf}; |
771 | |
1196 | |
772 | if (my $cb = shift @{ $self->{_queue} }) { |
1197 | if (my $cb = shift @{ $self->{_queue} }) { |
773 | unless ($cb->($self)) { |
1198 | unless ($cb->($self)) { |
774 | if ($self->{_eof}) { |
1199 | # no progress can be made |
775 | # no progress can be made (not enough data and no data forthcoming) |
1200 | # (not enough data and no data forthcoming) |
776 | $self->_error (&Errno::EPIPE, 1), return; |
1201 | $self->_error (Errno::EPIPE, 1), return |
777 | } |
1202 | if $self->{_eof}; |
778 | |
1203 | |
779 | unshift @{ $self->{_queue} }, $cb; |
1204 | unshift @{ $self->{_queue} }, $cb; |
780 | last; |
1205 | last; |
781 | } |
1206 | } |
782 | } elsif ($self->{on_read}) { |
1207 | } elsif ($self->{on_read}) { |
… | |
… | |
789 | && !@{ $self->{_queue} } # and the queue is still empty |
1214 | && !@{ $self->{_queue} } # and the queue is still empty |
790 | && $self->{on_read} # but we still have on_read |
1215 | && $self->{on_read} # but we still have on_read |
791 | ) { |
1216 | ) { |
792 | # no further data will arrive |
1217 | # no further data will arrive |
793 | # so no progress can be made |
1218 | # so no progress can be made |
794 | $self->_error (&Errno::EPIPE, 1), return |
1219 | $self->_error (Errno::EPIPE, 1), return |
795 | if $self->{_eof}; |
1220 | if $self->{_eof}; |
796 | |
1221 | |
797 | last; # more data might arrive |
1222 | last; # more data might arrive |
798 | } |
1223 | } |
799 | } else { |
1224 | } else { |
… | |
… | |
802 | last; |
1227 | last; |
803 | } |
1228 | } |
804 | } |
1229 | } |
805 | |
1230 | |
806 | if ($self->{_eof}) { |
1231 | if ($self->{_eof}) { |
807 | if ($self->{on_eof}) { |
1232 | $self->{on_eof} |
808 | $self->{on_eof}($self) |
1233 | ? $self->{on_eof}($self) |
809 | } else { |
1234 | : $self->_error (0, 1, "Unexpected end-of-file"); |
810 | $self->_error (0, 1); |
1235 | |
811 | } |
1236 | return; |
|
|
1237 | } |
|
|
1238 | |
|
|
1239 | if ( |
|
|
1240 | defined $self->{rbuf_max} |
|
|
1241 | && $self->{rbuf_max} < length $self->{rbuf} |
|
|
1242 | ) { |
|
|
1243 | $self->_error (Errno::ENOSPC, 1), return; |
812 | } |
1244 | } |
813 | |
1245 | |
814 | # may need to restart read watcher |
1246 | # may need to restart read watcher |
815 | unless ($self->{_rw}) { |
1247 | unless ($self->{_rw}) { |
816 | $self->start_read |
1248 | $self->start_read |
… | |
… | |
822 | |
1254 | |
823 | This replaces the currently set C<on_read> callback, or clears it (when |
1255 | This replaces the currently set C<on_read> callback, or clears it (when |
824 | the new callback is C<undef>). See the description of C<on_read> in the |
1256 | the new callback is C<undef>). See the description of C<on_read> in the |
825 | constructor. |
1257 | constructor. |
826 | |
1258 | |
|
|
1259 | This method may invoke callbacks (and therefore the handle might be |
|
|
1260 | destroyed after it returns). |
|
|
1261 | |
827 | =cut |
1262 | =cut |
828 | |
1263 | |
829 | sub on_read { |
1264 | sub on_read { |
830 | my ($self, $cb) = @_; |
1265 | my ($self, $cb) = @_; |
831 | |
1266 | |
832 | $self->{on_read} = $cb; |
1267 | $self->{on_read} = $cb; |
833 | $self->_drain_rbuf if $cb && !$self->{_in_drain}; |
1268 | $self->_drain_rbuf if $cb; |
834 | } |
1269 | } |
835 | |
1270 | |
836 | =item $handle->rbuf |
1271 | =item $handle->rbuf |
837 | |
1272 | |
838 | Returns the read buffer (as a modifiable lvalue). |
1273 | Returns the read buffer (as a modifiable lvalue). |
839 | |
1274 | |
840 | You can access the read buffer directly as the C<< ->{rbuf} >> member, if |
1275 | You can access the read buffer directly as the C<< ->{rbuf} >> |
841 | you want. |
1276 | member, if you want. However, the only operation allowed on the |
|
|
1277 | read buffer (apart from looking at it) is removing data from its |
|
|
1278 | beginning. Otherwise modifying or appending to it is not allowed and will |
|
|
1279 | lead to hard-to-track-down bugs. |
842 | |
1280 | |
843 | NOTE: The read buffer should only be used or modified if the C<on_read>, |
1281 | NOTE: The read buffer should only be used or modified if the C<on_read>, |
844 | C<push_read> or C<unshift_read> methods are used. The other read methods |
1282 | C<push_read> or C<unshift_read> methods are used. The other read methods |
845 | automatically manage the read buffer. |
1283 | automatically manage the read buffer. |
846 | |
1284 | |
… | |
… | |
867 | |
1305 | |
868 | If enough data was available, then the callback must remove all data it is |
1306 | If enough data was available, then the callback must remove all data it is |
869 | interested in (which can be none at all) and return a true value. After returning |
1307 | interested in (which can be none at all) and return a true value. After returning |
870 | true, it will be removed from the queue. |
1308 | true, it will be removed from the queue. |
871 | |
1309 | |
|
|
1310 | These methods may invoke callbacks (and therefore the handle might be |
|
|
1311 | destroyed after it returns). |
|
|
1312 | |
872 | =cut |
1313 | =cut |
873 | |
1314 | |
874 | our %RH; |
1315 | our %RH; |
875 | |
1316 | |
876 | sub register_read_type($$) { |
1317 | sub register_read_type($$) { |
… | |
… | |
882 | my $cb = pop; |
1323 | my $cb = pop; |
883 | |
1324 | |
884 | if (@_) { |
1325 | if (@_) { |
885 | my $type = shift; |
1326 | my $type = shift; |
886 | |
1327 | |
|
|
1328 | $cb = ($RH{$type} ||= _load_func "$type\::anyevent_read_type" |
887 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read") |
1329 | or Carp::croak "unsupported/unloadable type '$type' passed to AnyEvent::Handle::push_read") |
888 | ->($self, $cb, @_); |
1330 | ->($self, $cb, @_); |
889 | } |
1331 | } |
890 | |
1332 | |
891 | push @{ $self->{_queue} }, $cb; |
1333 | push @{ $self->{_queue} }, $cb; |
892 | $self->_drain_rbuf unless $self->{_in_drain}; |
1334 | $self->_drain_rbuf; |
893 | } |
1335 | } |
894 | |
1336 | |
895 | sub unshift_read { |
1337 | sub unshift_read { |
896 | my $self = shift; |
1338 | my $self = shift; |
897 | my $cb = pop; |
1339 | my $cb = pop; |
… | |
… | |
901 | |
1343 | |
902 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read") |
1344 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read") |
903 | ->($self, $cb, @_); |
1345 | ->($self, $cb, @_); |
904 | } |
1346 | } |
905 | |
1347 | |
906 | |
|
|
907 | unshift @{ $self->{_queue} }, $cb; |
1348 | unshift @{ $self->{_queue} }, $cb; |
908 | $self->_drain_rbuf unless $self->{_in_drain}; |
1349 | $self->_drain_rbuf; |
909 | } |
1350 | } |
910 | |
1351 | |
911 | =item $handle->push_read (type => @args, $cb) |
1352 | =item $handle->push_read (type => @args, $cb) |
912 | |
1353 | |
913 | =item $handle->unshift_read (type => @args, $cb) |
1354 | =item $handle->unshift_read (type => @args, $cb) |
914 | |
1355 | |
915 | Instead of providing a callback that parses the data itself you can chose |
1356 | Instead of providing a callback that parses the data itself you can chose |
916 | between a number of predefined parsing formats, for chunks of data, lines |
1357 | between a number of predefined parsing formats, for chunks of data, lines |
917 | etc. |
1358 | etc. You can also specify the (fully qualified) name of a package, in |
|
|
1359 | which case AnyEvent tries to load the package and then expects to find the |
|
|
1360 | C<anyevent_read_type> function inside (see "custom read types", below). |
918 | |
1361 | |
919 | Predefined types are (if you have ideas for additional types, feel free to |
1362 | Predefined types are (if you have ideas for additional types, feel free to |
920 | drop by and tell us): |
1363 | drop by and tell us): |
921 | |
1364 | |
922 | =over 4 |
1365 | =over 4 |
… | |
… | |
1046 | return 1; |
1489 | return 1; |
1047 | } |
1490 | } |
1048 | |
1491 | |
1049 | # reject |
1492 | # reject |
1050 | if ($reject && $$rbuf =~ $reject) { |
1493 | if ($reject && $$rbuf =~ $reject) { |
1051 | $self->_error (&Errno::EBADMSG); |
1494 | $self->_error (Errno::EBADMSG); |
1052 | } |
1495 | } |
1053 | |
1496 | |
1054 | # skip |
1497 | # skip |
1055 | if ($skip && $$rbuf =~ $skip) { |
1498 | if ($skip && $$rbuf =~ $skip) { |
1056 | $data .= substr $$rbuf, 0, $+[0], ""; |
1499 | $data .= substr $$rbuf, 0, $+[0], ""; |
… | |
… | |
1072 | my ($self, $cb) = @_; |
1515 | my ($self, $cb) = @_; |
1073 | |
1516 | |
1074 | sub { |
1517 | sub { |
1075 | unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) { |
1518 | unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) { |
1076 | if ($_[0]{rbuf} =~ /[^0-9]/) { |
1519 | if ($_[0]{rbuf} =~ /[^0-9]/) { |
1077 | $self->_error (&Errno::EBADMSG); |
1520 | $self->_error (Errno::EBADMSG); |
1078 | } |
1521 | } |
1079 | return; |
1522 | return; |
1080 | } |
1523 | } |
1081 | |
1524 | |
1082 | my $len = $1; |
1525 | my $len = $1; |
… | |
… | |
1085 | my $string = $_[1]; |
1528 | my $string = $_[1]; |
1086 | $_[0]->unshift_read (chunk => 1, sub { |
1529 | $_[0]->unshift_read (chunk => 1, sub { |
1087 | if ($_[1] eq ",") { |
1530 | if ($_[1] eq ",") { |
1088 | $cb->($_[0], $string); |
1531 | $cb->($_[0], $string); |
1089 | } else { |
1532 | } else { |
1090 | $self->_error (&Errno::EBADMSG); |
1533 | $self->_error (Errno::EBADMSG); |
1091 | } |
1534 | } |
1092 | }); |
1535 | }); |
1093 | }); |
1536 | }); |
1094 | |
1537 | |
1095 | 1 |
1538 | 1 |
… | |
… | |
1101 | An octet string prefixed with an encoded length. The encoding C<$format> |
1544 | An octet string prefixed with an encoded length. The encoding C<$format> |
1102 | uses the same format as a Perl C<pack> format, but must specify a single |
1545 | uses the same format as a Perl C<pack> format, but must specify a single |
1103 | integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an |
1546 | integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an |
1104 | optional C<!>, C<< < >> or C<< > >> modifier). |
1547 | optional C<!>, C<< < >> or C<< > >> modifier). |
1105 | |
1548 | |
1106 | DNS over TCP uses a prefix of C<n>, EPP uses a prefix of C<N>. |
1549 | For example, DNS over TCP uses a prefix of C<n> (2 octet network order), |
|
|
1550 | EPP uses a prefix of C<N> (4 octtes). |
1107 | |
1551 | |
1108 | Example: read a block of data prefixed by its length in BER-encoded |
1552 | Example: read a block of data prefixed by its length in BER-encoded |
1109 | format (very efficient). |
1553 | format (very efficient). |
1110 | |
1554 | |
1111 | $handle->push_read (packstring => "w", sub { |
1555 | $handle->push_read (packstring => "w", sub { |
… | |
… | |
1141 | } |
1585 | } |
1142 | }; |
1586 | }; |
1143 | |
1587 | |
1144 | =item json => $cb->($handle, $hash_or_arrayref) |
1588 | =item json => $cb->($handle, $hash_or_arrayref) |
1145 | |
1589 | |
1146 | Reads a JSON object or array, decodes it and passes it to the callback. |
1590 | Reads a JSON object or array, decodes it and passes it to the |
|
|
1591 | callback. When a parse error occurs, an C<EBADMSG> error will be raised. |
1147 | |
1592 | |
1148 | If a C<json> object was passed to the constructor, then that will be used |
1593 | If a C<json> object was passed to the constructor, then that will be used |
1149 | for the final decode, otherwise it will create a JSON coder expecting UTF-8. |
1594 | for the final decode, otherwise it will create a JSON coder expecting UTF-8. |
1150 | |
1595 | |
1151 | This read type uses the incremental parser available with JSON version |
1596 | This read type uses the incremental parser available with JSON version |
… | |
… | |
1160 | =cut |
1605 | =cut |
1161 | |
1606 | |
1162 | register_read_type json => sub { |
1607 | register_read_type json => sub { |
1163 | my ($self, $cb) = @_; |
1608 | my ($self, $cb) = @_; |
1164 | |
1609 | |
1165 | require JSON; |
1610 | my $json = $self->{json} ||= json_coder; |
1166 | |
1611 | |
1167 | my $data; |
1612 | my $data; |
1168 | my $rbuf = \$self->{rbuf}; |
1613 | my $rbuf = \$self->{rbuf}; |
1169 | |
1614 | |
1170 | my $json = $self->{json} ||= JSON->new->utf8; |
|
|
1171 | |
|
|
1172 | sub { |
1615 | sub { |
1173 | my $ref = $json->incr_parse ($self->{rbuf}); |
1616 | my $ref = eval { $json->incr_parse ($self->{rbuf}) }; |
1174 | |
1617 | |
1175 | if ($ref) { |
1618 | if ($ref) { |
1176 | $self->{rbuf} = $json->incr_text; |
1619 | $self->{rbuf} = $json->incr_text; |
1177 | $json->incr_text = ""; |
1620 | $json->incr_text = ""; |
1178 | $cb->($self, $ref); |
1621 | $cb->($self, $ref); |
1179 | |
1622 | |
1180 | 1 |
1623 | 1 |
|
|
1624 | } elsif ($@) { |
|
|
1625 | # error case |
|
|
1626 | $json->incr_skip; |
|
|
1627 | |
|
|
1628 | $self->{rbuf} = $json->incr_text; |
|
|
1629 | $json->incr_text = ""; |
|
|
1630 | |
|
|
1631 | $self->_error (Errno::EBADMSG); |
|
|
1632 | |
|
|
1633 | () |
1181 | } else { |
1634 | } else { |
1182 | $self->{rbuf} = ""; |
1635 | $self->{rbuf} = ""; |
|
|
1636 | |
1183 | () |
1637 | () |
1184 | } |
1638 | } |
1185 | } |
1639 | } |
1186 | }; |
1640 | }; |
1187 | |
1641 | |
… | |
… | |
1219 | # read remaining chunk |
1673 | # read remaining chunk |
1220 | $_[0]->unshift_read (chunk => $len, sub { |
1674 | $_[0]->unshift_read (chunk => $len, sub { |
1221 | if (my $ref = eval { Storable::thaw ($_[1]) }) { |
1675 | if (my $ref = eval { Storable::thaw ($_[1]) }) { |
1222 | $cb->($_[0], $ref); |
1676 | $cb->($_[0], $ref); |
1223 | } else { |
1677 | } else { |
1224 | $self->_error (&Errno::EBADMSG); |
1678 | $self->_error (Errno::EBADMSG); |
1225 | } |
1679 | } |
1226 | }); |
1680 | }); |
1227 | } |
1681 | } |
1228 | |
1682 | |
1229 | 1 |
1683 | 1 |
1230 | } |
1684 | } |
1231 | }; |
1685 | }; |
1232 | |
1686 | |
1233 | =back |
1687 | =back |
1234 | |
1688 | |
1235 | =item AnyEvent::Handle::register_read_type type => $coderef->($handle, $cb, @args) |
1689 | =item custom read types - Package::anyevent_read_type $handle, $cb, @args |
1236 | |
1690 | |
1237 | This function (not method) lets you add your own types to C<push_read>. |
1691 | Instead of one of the predefined types, you can also specify the name |
|
|
1692 | of a package. AnyEvent will try to load the package and then expects to |
|
|
1693 | find a function named C<anyevent_read_type> inside. If it isn't found, it |
|
|
1694 | progressively tries to load the parent package until it either finds the |
|
|
1695 | function (good) or runs out of packages (bad). |
1238 | |
1696 | |
1239 | Whenever the given C<type> is used, C<push_read> will invoke the code |
1697 | Whenever this type is used, C<push_read> will invoke the function with the |
1240 | reference with the handle object, the callback and the remaining |
1698 | handle object, the original callback and the remaining arguments. |
1241 | arguments. |
|
|
1242 | |
1699 | |
1243 | The code reference is supposed to return a callback (usually a closure) |
1700 | The function is supposed to return a callback (usually a closure) that |
1244 | that works as a plain read callback (see C<< ->push_read ($cb) >>). |
1701 | works as a plain read callback (see C<< ->push_read ($cb) >>), so you can |
|
|
1702 | mentally treat the function as a "configurable read type to read callback" |
|
|
1703 | converter. |
1245 | |
1704 | |
1246 | It should invoke the passed callback when it is done reading (remember to |
1705 | It should invoke the original callback when it is done reading (remember |
1247 | pass C<$handle> as first argument as all other callbacks do that). |
1706 | to pass C<$handle> as first argument as all other callbacks do that, |
|
|
1707 | although there is no strict requirement on this). |
1248 | |
1708 | |
1249 | Note that this is a function, and all types registered this way will be |
|
|
1250 | global, so try to use unique names. |
|
|
1251 | |
|
|
1252 | For examples, see the source of this module (F<perldoc -m AnyEvent::Handle>, |
1709 | For examples, see the source of this module (F<perldoc -m |
1253 | search for C<register_read_type>)). |
1710 | AnyEvent::Handle>, search for C<register_read_type>)). |
1254 | |
1711 | |
1255 | =item $handle->stop_read |
1712 | =item $handle->stop_read |
1256 | |
1713 | |
1257 | =item $handle->start_read |
1714 | =item $handle->start_read |
1258 | |
1715 | |
… | |
… | |
1278 | } |
1735 | } |
1279 | |
1736 | |
1280 | sub start_read { |
1737 | sub start_read { |
1281 | my ($self) = @_; |
1738 | my ($self) = @_; |
1282 | |
1739 | |
1283 | unless ($self->{_rw} || $self->{_eof}) { |
1740 | unless ($self->{_rw} || $self->{_eof} || !$self->{fh}) { |
1284 | Scalar::Util::weaken $self; |
1741 | Scalar::Util::weaken $self; |
1285 | |
1742 | |
1286 | $self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub { |
1743 | $self->{_rw} = AE::io $self->{fh}, 0, sub { |
1287 | my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf}); |
1744 | my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf}); |
1288 | my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf; |
1745 | my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf; |
1289 | |
1746 | |
1290 | if ($len > 0) { |
1747 | if ($len > 0) { |
1291 | $self->{_activity} = AnyEvent->now; |
1748 | $self->{_activity} = $self->{_ractivity} = AE::now; |
1292 | |
1749 | |
1293 | if ($self->{tls}) { |
1750 | if ($self->{tls}) { |
1294 | Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf); |
1751 | Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf); |
|
|
1752 | |
1295 | &_dotls ($self); |
1753 | &_dotls ($self); |
1296 | } else { |
1754 | } else { |
1297 | $self->_drain_rbuf unless $self->{_in_drain}; |
1755 | $self->_drain_rbuf; |
1298 | } |
1756 | } |
1299 | |
1757 | |
1300 | } elsif (defined $len) { |
1758 | } elsif (defined $len) { |
1301 | delete $self->{_rw}; |
1759 | delete $self->{_rw}; |
1302 | $self->{_eof} = 1; |
1760 | $self->{_eof} = 1; |
1303 | $self->_drain_rbuf unless $self->{_in_drain}; |
1761 | $self->_drain_rbuf; |
1304 | |
1762 | |
1305 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) { |
1763 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) { |
1306 | return $self->_error ($!, 1); |
1764 | return $self->_error ($!, 1); |
1307 | } |
1765 | } |
1308 | }); |
1766 | }; |
1309 | } |
1767 | } |
1310 | } |
1768 | } |
1311 | |
1769 | |
|
|
1770 | our $ERROR_SYSCALL; |
|
|
1771 | our $ERROR_WANT_READ; |
|
|
1772 | |
|
|
1773 | sub _tls_error { |
|
|
1774 | my ($self, $err) = @_; |
|
|
1775 | |
|
|
1776 | return $self->_error ($!, 1) |
|
|
1777 | if $err == Net::SSLeay::ERROR_SYSCALL (); |
|
|
1778 | |
|
|
1779 | my $err =Net::SSLeay::ERR_error_string (Net::SSLeay::ERR_get_error ()); |
|
|
1780 | |
|
|
1781 | # reduce error string to look less scary |
|
|
1782 | $err =~ s/^error:[0-9a-fA-F]{8}:[^:]+:([^:]+):/\L$1: /; |
|
|
1783 | |
|
|
1784 | if ($self->{_on_starttls}) { |
|
|
1785 | (delete $self->{_on_starttls})->($self, undef, $err); |
|
|
1786 | &_freetls; |
|
|
1787 | } else { |
|
|
1788 | &_freetls; |
|
|
1789 | $self->_error (Errno::EPROTO, 1, $err); |
|
|
1790 | } |
|
|
1791 | } |
|
|
1792 | |
|
|
1793 | # poll the write BIO and send the data if applicable |
|
|
1794 | # also decode read data if possible |
|
|
1795 | # this is basiclaly our TLS state machine |
|
|
1796 | # more efficient implementations are possible with openssl, |
|
|
1797 | # but not with the buggy and incomplete Net::SSLeay. |
1312 | sub _dotls { |
1798 | sub _dotls { |
1313 | my ($self) = @_; |
1799 | my ($self) = @_; |
1314 | |
1800 | |
1315 | my $buf; |
1801 | my $tmp; |
1316 | |
1802 | |
1317 | if (length $self->{_tls_wbuf}) { |
1803 | if (length $self->{_tls_wbuf}) { |
1318 | while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) { |
1804 | while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) { |
1319 | substr $self->{_tls_wbuf}, 0, $len, ""; |
1805 | substr $self->{_tls_wbuf}, 0, $tmp, ""; |
1320 | } |
1806 | } |
1321 | } |
|
|
1322 | |
1807 | |
|
|
1808 | $tmp = Net::SSLeay::get_error ($self->{tls}, $tmp); |
|
|
1809 | return $self->_tls_error ($tmp) |
|
|
1810 | if $tmp != $ERROR_WANT_READ |
|
|
1811 | && ($tmp != $ERROR_SYSCALL || $!); |
|
|
1812 | } |
|
|
1813 | |
1323 | while (defined ($buf = Net::SSLeay::read ($self->{tls}))) { |
1814 | while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) { |
1324 | unless (length $buf) { |
1815 | unless (length $tmp) { |
1325 | # let's treat SSL-eof as we treat normal EOF |
1816 | $self->{_on_starttls} |
1326 | delete $self->{_rw}; |
1817 | and (delete $self->{_on_starttls})->($self, undef, "EOF during handshake"); # ??? |
1327 | $self->{_eof} = 1; |
|
|
1328 | &_freetls; |
1818 | &_freetls; |
|
|
1819 | |
|
|
1820 | if ($self->{on_stoptls}) { |
|
|
1821 | $self->{on_stoptls}($self); |
|
|
1822 | return; |
|
|
1823 | } else { |
|
|
1824 | # let's treat SSL-eof as we treat normal EOF |
|
|
1825 | delete $self->{_rw}; |
|
|
1826 | $self->{_eof} = 1; |
|
|
1827 | } |
1329 | } |
1828 | } |
1330 | |
1829 | |
1331 | $self->{rbuf} .= $buf; |
1830 | $self->{_tls_rbuf} .= $tmp; |
1332 | $self->_drain_rbuf unless $self->{_in_drain}; |
1831 | $self->_drain_rbuf; |
1333 | $self->{tls} or return; # tls session might have gone away in callback |
1832 | $self->{tls} or return; # tls session might have gone away in callback |
1334 | } |
1833 | } |
1335 | |
1834 | |
1336 | my $err = Net::SSLeay::get_error ($self->{tls}, -1); |
1835 | $tmp = Net::SSLeay::get_error ($self->{tls}, -1); |
1337 | |
|
|
1338 | if ($err!= Net::SSLeay::ERROR_WANT_READ ()) { |
|
|
1339 | if ($err == Net::SSLeay::ERROR_SYSCALL ()) { |
|
|
1340 | return $self->_error ($!, 1); |
1836 | return $self->_tls_error ($tmp) |
1341 | } elsif ($err == Net::SSLeay::ERROR_SSL ()) { |
1837 | if $tmp != $ERROR_WANT_READ |
1342 | return $self->_error (&Errno::EIO, 1); |
1838 | && ($tmp != $ERROR_SYSCALL || $!); |
1343 | } |
|
|
1344 | |
1839 | |
1345 | # all others are fine for our purposes |
|
|
1346 | } |
|
|
1347 | |
|
|
1348 | if (length ($buf = Net::SSLeay::BIO_read ($self->{_wbio}))) { |
1840 | while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) { |
1349 | $self->{wbuf} .= $buf; |
1841 | $self->{wbuf} .= $tmp; |
1350 | $self->_drain_wbuf; |
1842 | $self->_drain_wbuf; |
|
|
1843 | $self->{tls} or return; # tls session might have gone away in callback |
1351 | } |
1844 | } |
|
|
1845 | |
|
|
1846 | $self->{_on_starttls} |
|
|
1847 | and Net::SSLeay::state ($self->{tls}) == Net::SSLeay::ST_OK () |
|
|
1848 | and (delete $self->{_on_starttls})->($self, 1, "TLS/SSL connection established"); |
1352 | } |
1849 | } |
1353 | |
1850 | |
1354 | =item $handle->starttls ($tls[, $tls_ctx]) |
1851 | =item $handle->starttls ($tls[, $tls_ctx]) |
1355 | |
1852 | |
1356 | Instead of starting TLS negotiation immediately when the AnyEvent::Handle |
1853 | Instead of starting TLS negotiation immediately when the AnyEvent::Handle |
1357 | object is created, you can also do that at a later time by calling |
1854 | object is created, you can also do that at a later time by calling |
1358 | C<starttls>. |
1855 | C<starttls>. |
1359 | |
1856 | |
|
|
1857 | Starting TLS is currently an asynchronous operation - when you push some |
|
|
1858 | write data and then call C<< ->starttls >> then TLS negotiation will start |
|
|
1859 | immediately, after which the queued write data is then sent. |
|
|
1860 | |
1360 | The first argument is the same as the C<tls> constructor argument (either |
1861 | The first argument is the same as the C<tls> constructor argument (either |
1361 | C<"connect">, C<"accept"> or an existing Net::SSLeay object). |
1862 | C<"connect">, C<"accept"> or an existing Net::SSLeay object). |
1362 | |
1863 | |
1363 | The second argument is the optional C<Net::SSLeay::CTX> object that is |
1864 | The second argument is the optional C<AnyEvent::TLS> object that is used |
1364 | used when AnyEvent::Handle has to create its own TLS connection object. |
1865 | when AnyEvent::Handle has to create its own TLS connection object, or |
|
|
1866 | a hash reference with C<< key => value >> pairs that will be used to |
|
|
1867 | construct a new context. |
1365 | |
1868 | |
1366 | The TLS connection object will end up in C<< $handle->{tls} >> after this |
1869 | The TLS connection object will end up in C<< $handle->{tls} >>, the TLS |
1367 | call and can be used or changed to your liking. Note that the handshake |
1870 | context in C<< $handle->{tls_ctx} >> after this call and can be used or |
1368 | might have already started when this function returns. |
1871 | changed to your liking. Note that the handshake might have already started |
|
|
1872 | when this function returns. |
1369 | |
1873 | |
1370 | If it an error to start a TLS handshake more than once per |
1874 | Due to bugs in OpenSSL, it might or might not be possible to do multiple |
1371 | AnyEvent::Handle object (this is due to bugs in OpenSSL). |
1875 | handshakes on the same stream. Best do not attempt to use the stream after |
|
|
1876 | stopping TLS. |
1372 | |
1877 | |
|
|
1878 | This method may invoke callbacks (and therefore the handle might be |
|
|
1879 | destroyed after it returns). |
|
|
1880 | |
1373 | =cut |
1881 | =cut |
|
|
1882 | |
|
|
1883 | our %TLS_CACHE; #TODO not yet documented, should we? |
1374 | |
1884 | |
1375 | sub starttls { |
1885 | sub starttls { |
1376 | my ($self, $ssl, $ctx) = @_; |
1886 | my ($self, $tls, $ctx) = @_; |
|
|
1887 | |
|
|
1888 | Carp::croak "It is an error to call starttls on an AnyEvent::Handle object while TLS is already active, caught" |
|
|
1889 | if $self->{tls}; |
|
|
1890 | |
|
|
1891 | $self->{tls} = $tls; |
|
|
1892 | $self->{tls_ctx} = $ctx if @_ > 2; |
|
|
1893 | |
|
|
1894 | return unless $self->{fh}; |
1377 | |
1895 | |
1378 | require Net::SSLeay; |
1896 | require Net::SSLeay; |
1379 | |
1897 | |
1380 | Carp::croak "it is an error to call starttls more than once on an Anyevent::Handle object" |
1898 | $ERROR_SYSCALL = Net::SSLeay::ERROR_SYSCALL (); |
1381 | if $self->{tls}; |
1899 | $ERROR_WANT_READ = Net::SSLeay::ERROR_WANT_READ (); |
|
|
1900 | |
|
|
1901 | $tls = delete $self->{tls}; |
|
|
1902 | $ctx = $self->{tls_ctx}; |
|
|
1903 | |
|
|
1904 | local $Carp::CarpLevel = 1; # skip ourselves when creating a new context or session |
|
|
1905 | |
|
|
1906 | if ("HASH" eq ref $ctx) { |
|
|
1907 | require AnyEvent::TLS; |
|
|
1908 | |
|
|
1909 | if ($ctx->{cache}) { |
|
|
1910 | my $key = $ctx+0; |
|
|
1911 | $ctx = $TLS_CACHE{$key} ||= new AnyEvent::TLS %$ctx; |
|
|
1912 | } else { |
|
|
1913 | $ctx = new AnyEvent::TLS %$ctx; |
|
|
1914 | } |
|
|
1915 | } |
1382 | |
1916 | |
1383 | if ($ssl eq "accept") { |
1917 | $self->{tls_ctx} = $ctx || TLS_CTX (); |
1384 | $ssl = Net::SSLeay::new ($ctx || TLS_CTX ()); |
1918 | $self->{tls} = $tls = $self->{tls_ctx}->_get_session ($tls, $self, $self->{peername}); |
1385 | Net::SSLeay::set_accept_state ($ssl); |
|
|
1386 | } elsif ($ssl eq "connect") { |
|
|
1387 | $ssl = Net::SSLeay::new ($ctx || TLS_CTX ()); |
|
|
1388 | Net::SSLeay::set_connect_state ($ssl); |
|
|
1389 | } |
|
|
1390 | |
|
|
1391 | $self->{tls} = $ssl; |
|
|
1392 | |
1919 | |
1393 | # basically, this is deep magic (because SSL_read should have the same issues) |
1920 | # basically, this is deep magic (because SSL_read should have the same issues) |
1394 | # but the openssl maintainers basically said: "trust us, it just works". |
1921 | # but the openssl maintainers basically said: "trust us, it just works". |
1395 | # (unfortunately, we have to hardcode constants because the abysmally misdesigned |
1922 | # (unfortunately, we have to hardcode constants because the abysmally misdesigned |
1396 | # and mismaintained ssleay-module doesn't even offer them). |
1923 | # and mismaintained ssleay-module doesn't even offer them). |
… | |
… | |
1400 | # |
1927 | # |
1401 | # note that we do not try to keep the length constant between writes as we are required to do. |
1928 | # note that we do not try to keep the length constant between writes as we are required to do. |
1402 | # we assume that most (but not all) of this insanity only applies to non-blocking cases, |
1929 | # we assume that most (but not all) of this insanity only applies to non-blocking cases, |
1403 | # and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to |
1930 | # and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to |
1404 | # have identity issues in that area. |
1931 | # have identity issues in that area. |
1405 | Net::SSLeay::CTX_set_mode ($self->{tls}, |
1932 | # Net::SSLeay::CTX_set_mode ($ssl, |
1406 | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1) |
1933 | # (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1) |
1407 | | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2)); |
1934 | # | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2)); |
|
|
1935 | Net::SSLeay::CTX_set_mode ($tls, 1|2); |
1408 | |
1936 | |
1409 | $self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
1937 | $self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
1410 | $self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
1938 | $self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
1411 | |
1939 | |
|
|
1940 | Net::SSLeay::BIO_write ($self->{_rbio}, delete $self->{rbuf}); |
|
|
1941 | |
1412 | Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio}); |
1942 | Net::SSLeay::set_bio ($tls, $self->{_rbio}, $self->{_wbio}); |
|
|
1943 | |
|
|
1944 | $self->{_on_starttls} = sub { $_[0]{on_starttls}(@_) } |
|
|
1945 | if $self->{on_starttls}; |
1413 | |
1946 | |
1414 | &_dotls; # need to trigger the initial handshake |
1947 | &_dotls; # need to trigger the initial handshake |
1415 | $self->start_read; # make sure we actually do read |
1948 | $self->start_read; # make sure we actually do read |
1416 | } |
1949 | } |
1417 | |
1950 | |
1418 | =item $handle->stoptls |
1951 | =item $handle->stoptls |
1419 | |
1952 | |
1420 | Shuts down the SSL connection - this makes a proper EOF handshake by |
1953 | Shuts down the SSL connection - this makes a proper EOF handshake by |
1421 | sending a close notify to the other side, but since OpenSSL doesn't |
1954 | sending a close notify to the other side, but since OpenSSL doesn't |
1422 | support non-blocking shut downs, it is not possible to re-use the stream |
1955 | support non-blocking shut downs, it is not guaranteed that you can re-use |
1423 | afterwards. |
1956 | the stream afterwards. |
|
|
1957 | |
|
|
1958 | This method may invoke callbacks (and therefore the handle might be |
|
|
1959 | destroyed after it returns). |
1424 | |
1960 | |
1425 | =cut |
1961 | =cut |
1426 | |
1962 | |
1427 | sub stoptls { |
1963 | sub stoptls { |
1428 | my ($self) = @_; |
1964 | my ($self) = @_; |
1429 | |
1965 | |
1430 | if ($self->{tls}) { |
1966 | if ($self->{tls} && $self->{fh}) { |
1431 | Net::SSLeay::shutdown ($self->{tls}); |
1967 | Net::SSLeay::shutdown ($self->{tls}); |
1432 | |
1968 | |
1433 | &_dotls; |
1969 | &_dotls; |
1434 | |
1970 | |
1435 | # we don't give a shit. no, we do, but we can't. no... |
1971 | # # we don't give a shit. no, we do, but we can't. no...#d# |
1436 | # we, we... have to use openssl :/ |
1972 | # # we, we... have to use openssl :/#d# |
1437 | &_freetls; |
1973 | # &_freetls;#d# |
1438 | } |
1974 | } |
1439 | } |
1975 | } |
1440 | |
1976 | |
1441 | sub _freetls { |
1977 | sub _freetls { |
1442 | my ($self) = @_; |
1978 | my ($self) = @_; |
1443 | |
1979 | |
1444 | return unless $self->{tls}; |
1980 | return unless $self->{tls}; |
1445 | |
1981 | |
1446 | Net::SSLeay::free (delete $self->{tls}); |
1982 | $self->{tls_ctx}->_put_session (delete $self->{tls}) |
|
|
1983 | if $self->{tls} > 0; |
1447 | |
1984 | |
1448 | delete @$self{qw(_rbio _wbio _tls_wbuf)}; |
1985 | delete @$self{qw(_rbio _wbio _tls_wbuf _on_starttls)}; |
1449 | } |
1986 | } |
1450 | |
1987 | |
1451 | sub DESTROY { |
1988 | sub DESTROY { |
1452 | my $self = shift; |
1989 | my ($self) = @_; |
1453 | |
1990 | |
1454 | &_freetls; |
1991 | &_freetls; |
1455 | |
1992 | |
1456 | my $linger = exists $self->{linger} ? $self->{linger} : 3600; |
1993 | my $linger = exists $self->{linger} ? $self->{linger} : 3600; |
1457 | |
1994 | |
1458 | if ($linger && length $self->{wbuf}) { |
1995 | if ($linger && length $self->{wbuf} && $self->{fh}) { |
1459 | my $fh = delete $self->{fh}; |
1996 | my $fh = delete $self->{fh}; |
1460 | my $wbuf = delete $self->{wbuf}; |
1997 | my $wbuf = delete $self->{wbuf}; |
1461 | |
1998 | |
1462 | my @linger; |
1999 | my @linger; |
1463 | |
2000 | |
1464 | push @linger, AnyEvent->io (fh => $fh, poll => "w", cb => sub { |
2001 | push @linger, AE::io $fh, 1, sub { |
1465 | my $len = syswrite $fh, $wbuf, length $wbuf; |
2002 | my $len = syswrite $fh, $wbuf, length $wbuf; |
1466 | |
2003 | |
1467 | if ($len > 0) { |
2004 | if ($len > 0) { |
1468 | substr $wbuf, 0, $len, ""; |
2005 | substr $wbuf, 0, $len, ""; |
1469 | } else { |
2006 | } else { |
1470 | @linger = (); # end |
2007 | @linger = (); # end |
1471 | } |
2008 | } |
1472 | }); |
2009 | }; |
1473 | push @linger, AnyEvent->timer (after => $linger, cb => sub { |
2010 | push @linger, AE::timer $linger, 0, sub { |
1474 | @linger = (); |
2011 | @linger = (); |
1475 | }); |
2012 | }; |
1476 | } |
2013 | } |
1477 | } |
2014 | } |
|
|
2015 | |
|
|
2016 | =item $handle->destroy |
|
|
2017 | |
|
|
2018 | Shuts down the handle object as much as possible - this call ensures that |
|
|
2019 | no further callbacks will be invoked and as many resources as possible |
|
|
2020 | will be freed. Any method you will call on the handle object after |
|
|
2021 | destroying it in this way will be silently ignored (and it will return the |
|
|
2022 | empty list). |
|
|
2023 | |
|
|
2024 | Normally, you can just "forget" any references to an AnyEvent::Handle |
|
|
2025 | object and it will simply shut down. This works in fatal error and EOF |
|
|
2026 | callbacks, as well as code outside. It does I<NOT> work in a read or write |
|
|
2027 | callback, so when you want to destroy the AnyEvent::Handle object from |
|
|
2028 | within such an callback. You I<MUST> call C<< ->destroy >> explicitly in |
|
|
2029 | that case. |
|
|
2030 | |
|
|
2031 | Destroying the handle object in this way has the advantage that callbacks |
|
|
2032 | will be removed as well, so if those are the only reference holders (as |
|
|
2033 | is common), then one doesn't need to do anything special to break any |
|
|
2034 | reference cycles. |
|
|
2035 | |
|
|
2036 | The handle might still linger in the background and write out remaining |
|
|
2037 | data, as specified by the C<linger> option, however. |
|
|
2038 | |
|
|
2039 | =cut |
|
|
2040 | |
|
|
2041 | sub destroy { |
|
|
2042 | my ($self) = @_; |
|
|
2043 | |
|
|
2044 | $self->DESTROY; |
|
|
2045 | %$self = (); |
|
|
2046 | bless $self, "AnyEvent::Handle::destroyed"; |
|
|
2047 | } |
|
|
2048 | |
|
|
2049 | sub AnyEvent::Handle::destroyed::AUTOLOAD { |
|
|
2050 | #nop |
|
|
2051 | } |
|
|
2052 | |
|
|
2053 | =item $handle->destroyed |
|
|
2054 | |
|
|
2055 | Returns false as long as the handle hasn't been destroyed by a call to C<< |
|
|
2056 | ->destroy >>, true otherwise. |
|
|
2057 | |
|
|
2058 | Can be useful to decide whether the handle is still valid after some |
|
|
2059 | callback possibly destroyed the handle. For example, C<< ->push_write >>, |
|
|
2060 | C<< ->starttls >> and other methods can call user callbacks, which in turn |
|
|
2061 | can destroy the handle, so work can be avoided by checking sometimes: |
|
|
2062 | |
|
|
2063 | $hdl->starttls ("accept"); |
|
|
2064 | return if $hdl->destroyed; |
|
|
2065 | $hdl->push_write (... |
|
|
2066 | |
|
|
2067 | Note that the call to C<push_write> will silently be ignored if the handle |
|
|
2068 | has been destroyed, so often you can just ignore the possibility of the |
|
|
2069 | handle being destroyed. |
|
|
2070 | |
|
|
2071 | =cut |
|
|
2072 | |
|
|
2073 | sub destroyed { 0 } |
|
|
2074 | sub AnyEvent::Handle::destroyed::destroyed { 1 } |
1478 | |
2075 | |
1479 | =item AnyEvent::Handle::TLS_CTX |
2076 | =item AnyEvent::Handle::TLS_CTX |
1480 | |
2077 | |
1481 | This function creates and returns the Net::SSLeay::CTX object used by |
2078 | This function creates and returns the AnyEvent::TLS object used by default |
1482 | default for TLS mode. |
2079 | for TLS mode. |
1483 | |
2080 | |
1484 | The context is created like this: |
2081 | The context is created by calling L<AnyEvent::TLS> without any arguments. |
1485 | |
|
|
1486 | Net::SSLeay::load_error_strings; |
|
|
1487 | Net::SSLeay::SSLeay_add_ssl_algorithms; |
|
|
1488 | Net::SSLeay::randomize; |
|
|
1489 | |
|
|
1490 | my $CTX = Net::SSLeay::CTX_new; |
|
|
1491 | |
|
|
1492 | Net::SSLeay::CTX_set_options $CTX, Net::SSLeay::OP_ALL |
|
|
1493 | |
2082 | |
1494 | =cut |
2083 | =cut |
1495 | |
2084 | |
1496 | our $TLS_CTX; |
2085 | our $TLS_CTX; |
1497 | |
2086 | |
1498 | sub TLS_CTX() { |
2087 | sub TLS_CTX() { |
1499 | $TLS_CTX || do { |
2088 | $TLS_CTX ||= do { |
1500 | require Net::SSLeay; |
2089 | require AnyEvent::TLS; |
1501 | |
2090 | |
1502 | Net::SSLeay::load_error_strings (); |
2091 | new AnyEvent::TLS |
1503 | Net::SSLeay::SSLeay_add_ssl_algorithms (); |
|
|
1504 | Net::SSLeay::randomize (); |
|
|
1505 | |
|
|
1506 | $TLS_CTX = Net::SSLeay::CTX_new (); |
|
|
1507 | |
|
|
1508 | Net::SSLeay::CTX_set_options ($TLS_CTX, Net::SSLeay::OP_ALL ()); |
|
|
1509 | |
|
|
1510 | $TLS_CTX |
|
|
1511 | } |
2092 | } |
1512 | } |
2093 | } |
1513 | |
2094 | |
1514 | =back |
2095 | =back |
1515 | |
2096 | |
1516 | |
2097 | |
1517 | =head1 NONFREQUENTLY ASKED QUESTIONS |
2098 | =head1 NONFREQUENTLY ASKED QUESTIONS |
1518 | |
2099 | |
1519 | =over 4 |
2100 | =over 4 |
1520 | |
2101 | |
|
|
2102 | =item I C<undef> the AnyEvent::Handle reference inside my callback and |
|
|
2103 | still get further invocations! |
|
|
2104 | |
|
|
2105 | That's because AnyEvent::Handle keeps a reference to itself when handling |
|
|
2106 | read or write callbacks. |
|
|
2107 | |
|
|
2108 | It is only safe to "forget" the reference inside EOF or error callbacks, |
|
|
2109 | from within all other callbacks, you need to explicitly call the C<< |
|
|
2110 | ->destroy >> method. |
|
|
2111 | |
|
|
2112 | =item I get different callback invocations in TLS mode/Why can't I pause |
|
|
2113 | reading? |
|
|
2114 | |
|
|
2115 | Unlike, say, TCP, TLS connections do not consist of two independent |
|
|
2116 | communication channels, one for each direction. Or put differently. The |
|
|
2117 | read and write directions are not independent of each other: you cannot |
|
|
2118 | write data unless you are also prepared to read, and vice versa. |
|
|
2119 | |
|
|
2120 | This can mean than, in TLS mode, you might get C<on_error> or C<on_eof> |
|
|
2121 | callback invocations when you are not expecting any read data - the reason |
|
|
2122 | is that AnyEvent::Handle always reads in TLS mode. |
|
|
2123 | |
|
|
2124 | During the connection, you have to make sure that you always have a |
|
|
2125 | non-empty read-queue, or an C<on_read> watcher. At the end of the |
|
|
2126 | connection (or when you no longer want to use it) you can call the |
|
|
2127 | C<destroy> method. |
|
|
2128 | |
1521 | =item How do I read data until the other side closes the connection? |
2129 | =item How do I read data until the other side closes the connection? |
1522 | |
2130 | |
1523 | If you just want to read your data into a perl scalar, the easiest way to achieve this is |
2131 | If you just want to read your data into a perl scalar, the easiest way |
1524 | by setting an C<on_read> callback that does nothing, clearing the C<on_eof> callback |
2132 | to achieve this is by setting an C<on_read> callback that does nothing, |
1525 | and in the C<on_error> callback, the data will be in C<$_[0]{rbuf}>: |
2133 | clearing the C<on_eof> callback and in the C<on_error> callback, the data |
|
|
2134 | will be in C<$_[0]{rbuf}>: |
1526 | |
2135 | |
1527 | $handle->on_read (sub { }); |
2136 | $handle->on_read (sub { }); |
1528 | $handle->on_eof (undef); |
2137 | $handle->on_eof (undef); |
1529 | $handle->on_error (sub { |
2138 | $handle->on_error (sub { |
1530 | my $data = delete $_[0]{rbuf}; |
2139 | my $data = delete $_[0]{rbuf}; |
1531 | undef $handle; |
|
|
1532 | }); |
2140 | }); |
1533 | |
2141 | |
1534 | The reason to use C<on_error> is that TCP connections, due to latencies |
2142 | The reason to use C<on_error> is that TCP connections, due to latencies |
1535 | and packets loss, might get closed quite violently with an error, when in |
2143 | and packets loss, might get closed quite violently with an error, when in |
1536 | fact, all data has been received. |
2144 | fact, all data has been received. |
1537 | |
2145 | |
1538 | It is usually better to use acknowledgements when transfering data, |
2146 | It is usually better to use acknowledgements when transferring data, |
1539 | to make sure the other side hasn't just died and you got the data |
2147 | to make sure the other side hasn't just died and you got the data |
1540 | intact. This is also one reason why so many internet protocols have an |
2148 | intact. This is also one reason why so many internet protocols have an |
1541 | explicit QUIT command. |
2149 | explicit QUIT command. |
1542 | |
2150 | |
1543 | |
|
|
1544 | =item I don't want to destroy the handle too early - how do I wait until all data has been sent? |
2151 | =item I don't want to destroy the handle too early - how do I wait until |
|
|
2152 | all data has been written? |
1545 | |
2153 | |
1546 | After writing your last bits of data, set the C<on_drain> callback |
2154 | After writing your last bits of data, set the C<on_drain> callback |
1547 | and destroy the handle in there - with the default setting of |
2155 | and destroy the handle in there - with the default setting of |
1548 | C<low_water_mark> this will be called precisely when all data has been |
2156 | C<low_water_mark> this will be called precisely when all data has been |
1549 | written to the socket: |
2157 | written to the socket: |
… | |
… | |
1552 | $handle->on_drain (sub { |
2160 | $handle->on_drain (sub { |
1553 | warn "all data submitted to the kernel\n"; |
2161 | warn "all data submitted to the kernel\n"; |
1554 | undef $handle; |
2162 | undef $handle; |
1555 | }); |
2163 | }); |
1556 | |
2164 | |
|
|
2165 | If you just want to queue some data and then signal EOF to the other side, |
|
|
2166 | consider using C<< ->push_shutdown >> instead. |
|
|
2167 | |
|
|
2168 | =item I want to contact a TLS/SSL server, I don't care about security. |
|
|
2169 | |
|
|
2170 | If your TLS server is a pure TLS server (e.g. HTTPS) that only speaks TLS, |
|
|
2171 | simply connect to it and then create the AnyEvent::Handle with the C<tls> |
|
|
2172 | parameter: |
|
|
2173 | |
|
|
2174 | tcp_connect $host, $port, sub { |
|
|
2175 | my ($fh) = @_; |
|
|
2176 | |
|
|
2177 | my $handle = new AnyEvent::Handle |
|
|
2178 | fh => $fh, |
|
|
2179 | tls => "connect", |
|
|
2180 | on_error => sub { ... }; |
|
|
2181 | |
|
|
2182 | $handle->push_write (...); |
|
|
2183 | }; |
|
|
2184 | |
|
|
2185 | =item I want to contact a TLS/SSL server, I do care about security. |
|
|
2186 | |
|
|
2187 | Then you should additionally enable certificate verification, including |
|
|
2188 | peername verification, if the protocol you use supports it (see |
|
|
2189 | L<AnyEvent::TLS>, C<verify_peername>). |
|
|
2190 | |
|
|
2191 | E.g. for HTTPS: |
|
|
2192 | |
|
|
2193 | tcp_connect $host, $port, sub { |
|
|
2194 | my ($fh) = @_; |
|
|
2195 | |
|
|
2196 | my $handle = new AnyEvent::Handle |
|
|
2197 | fh => $fh, |
|
|
2198 | peername => $host, |
|
|
2199 | tls => "connect", |
|
|
2200 | tls_ctx => { verify => 1, verify_peername => "https" }, |
|
|
2201 | ... |
|
|
2202 | |
|
|
2203 | Note that you must specify the hostname you connected to (or whatever |
|
|
2204 | "peername" the protocol needs) as the C<peername> argument, otherwise no |
|
|
2205 | peername verification will be done. |
|
|
2206 | |
|
|
2207 | The above will use the system-dependent default set of trusted CA |
|
|
2208 | certificates. If you want to check against a specific CA, add the |
|
|
2209 | C<ca_file> (or C<ca_cert>) arguments to C<tls_ctx>: |
|
|
2210 | |
|
|
2211 | tls_ctx => { |
|
|
2212 | verify => 1, |
|
|
2213 | verify_peername => "https", |
|
|
2214 | ca_file => "my-ca-cert.pem", |
|
|
2215 | }, |
|
|
2216 | |
|
|
2217 | =item I want to create a TLS/SSL server, how do I do that? |
|
|
2218 | |
|
|
2219 | Well, you first need to get a server certificate and key. You have |
|
|
2220 | three options: a) ask a CA (buy one, use cacert.org etc.) b) create a |
|
|
2221 | self-signed certificate (cheap. check the search engine of your choice, |
|
|
2222 | there are many tutorials on the net) or c) make your own CA (tinyca2 is a |
|
|
2223 | nice program for that purpose). |
|
|
2224 | |
|
|
2225 | Then create a file with your private key (in PEM format, see |
|
|
2226 | L<AnyEvent::TLS>), followed by the certificate (also in PEM format). The |
|
|
2227 | file should then look like this: |
|
|
2228 | |
|
|
2229 | -----BEGIN RSA PRIVATE KEY----- |
|
|
2230 | ...header data |
|
|
2231 | ... lots of base64'y-stuff |
|
|
2232 | -----END RSA PRIVATE KEY----- |
|
|
2233 | |
|
|
2234 | -----BEGIN CERTIFICATE----- |
|
|
2235 | ... lots of base64'y-stuff |
|
|
2236 | -----END CERTIFICATE----- |
|
|
2237 | |
|
|
2238 | The important bits are the "PRIVATE KEY" and "CERTIFICATE" parts. Then |
|
|
2239 | specify this file as C<cert_file>: |
|
|
2240 | |
|
|
2241 | tcp_server undef, $port, sub { |
|
|
2242 | my ($fh) = @_; |
|
|
2243 | |
|
|
2244 | my $handle = new AnyEvent::Handle |
|
|
2245 | fh => $fh, |
|
|
2246 | tls => "accept", |
|
|
2247 | tls_ctx => { cert_file => "my-server-keycert.pem" }, |
|
|
2248 | ... |
|
|
2249 | |
|
|
2250 | When you have intermediate CA certificates that your clients might not |
|
|
2251 | know about, just append them to the C<cert_file>. |
|
|
2252 | |
1557 | =back |
2253 | =back |
1558 | |
2254 | |
1559 | |
2255 | |
1560 | =head1 SUBCLASSING AnyEvent::Handle |
2256 | =head1 SUBCLASSING AnyEvent::Handle |
1561 | |
2257 | |