1 | package AnyEvent::Handle; |
1 | package AnyEvent::Handle; |
2 | |
2 | |
3 | no warnings; |
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4 | use strict; |
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5 | |
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6 | use AnyEvent (); |
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7 | use AnyEvent::Util qw(WSAEWOULDBLOCK); |
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8 | use Scalar::Util (); |
3 | use Scalar::Util (); |
9 | use Carp (); |
4 | use Carp (); |
10 | use Fcntl (); |
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11 | use Errno qw(EAGAIN EINTR); |
5 | use Errno qw(EAGAIN EINTR); |
12 | |
6 | |
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7 | use AnyEvent (); BEGIN { AnyEvent::common_sense } |
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8 | use AnyEvent::Util qw(WSAEWOULDBLOCK); |
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9 | |
13 | =head1 NAME |
10 | =head1 NAME |
14 | |
11 | |
15 | AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent |
12 | AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent |
16 | |
13 | |
17 | =cut |
14 | =cut |
18 | |
15 | |
19 | our $VERSION = 4.1; |
16 | our $VERSION = 4.86; |
20 | |
17 | |
21 | =head1 SYNOPSIS |
18 | =head1 SYNOPSIS |
22 | |
19 | |
23 | use AnyEvent; |
20 | use AnyEvent; |
24 | use AnyEvent::Handle; |
21 | use AnyEvent::Handle; |
25 | |
22 | |
26 | my $cv = AnyEvent->condvar; |
23 | my $cv = AnyEvent->condvar; |
27 | |
24 | |
28 | my $handle = |
25 | my $hdl; $hdl = new AnyEvent::Handle |
29 | AnyEvent::Handle->new ( |
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30 | fh => \*STDIN, |
26 | fh => \*STDIN, |
31 | on_eof => sub { |
27 | on_error => sub { |
32 | $cv->broadcast; |
28 | my ($hdl, $fatal, $msg) = @_; |
33 | }, |
29 | warn "got error $msg\n"; |
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30 | $hdl->destroy; |
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31 | $cv->send; |
34 | ); |
32 | ); |
35 | |
33 | |
36 | # send some request line |
34 | # send some request line |
37 | $handle->push_write ("getinfo\015\012"); |
35 | $hdl->push_write ("getinfo\015\012"); |
38 | |
36 | |
39 | # read the response line |
37 | # read the response line |
40 | $handle->push_read (line => sub { |
38 | $hdl->push_read (line => sub { |
41 | my ($handle, $line) = @_; |
39 | my ($hdl, $line) = @_; |
42 | warn "read line <$line>\n"; |
40 | warn "got line <$line>\n"; |
43 | $cv->send; |
41 | $cv->send; |
44 | }); |
42 | }); |
45 | |
43 | |
46 | $cv->recv; |
44 | $cv->recv; |
47 | |
45 | |
48 | =head1 DESCRIPTION |
46 | =head1 DESCRIPTION |
49 | |
47 | |
50 | This module is a helper module to make it easier to do event-based I/O on |
48 | 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 |
49 | filehandles. |
52 | on sockets see L<AnyEvent::Util>. |
50 | |
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51 | The L<AnyEvent::Intro> tutorial contains some well-documented |
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52 | AnyEvent::Handle examples. |
53 | |
53 | |
54 | In the following, when the documentation refers to of "bytes" then this |
54 | In the following, when the documentation refers to of "bytes" then this |
55 | means characters. As sysread and syswrite are used for all I/O, their |
55 | means characters. As sysread and syswrite are used for all I/O, their |
56 | treatment of characters applies to this module as well. |
56 | treatment of characters applies to this module as well. |
57 | |
57 | |
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58 | At the very minimum, you should specify C<fh> or C<connect>, and the |
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59 | C<on_error> callback. |
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60 | |
58 | All callbacks will be invoked with the handle object as their first |
61 | All callbacks will be invoked with the handle object as their first |
59 | argument. |
62 | argument. |
60 | |
63 | |
61 | =head1 METHODS |
64 | =head1 METHODS |
62 | |
65 | |
63 | =over 4 |
66 | =over 4 |
64 | |
67 | |
65 | =item B<new (%args)> |
68 | =item $handle = B<new> AnyEvent::TLS fh => $filehandle, key => value... |
66 | |
69 | |
67 | The constructor supports these arguments (all as key => value pairs). |
70 | The constructor supports these arguments (all as C<< key => value >> pairs). |
68 | |
71 | |
69 | =over 4 |
72 | =over 4 |
70 | |
73 | |
71 | =item fh => $filehandle [MANDATORY] |
74 | =item fh => $filehandle [C<fh> or C<connect> MANDATORY] |
72 | |
75 | |
73 | The filehandle this L<AnyEvent::Handle> object will operate on. |
76 | The filehandle this L<AnyEvent::Handle> object will operate on. |
74 | |
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75 | NOTE: The filehandle will be set to non-blocking (using |
77 | NOTE: The filehandle will be set to non-blocking mode (using |
76 | AnyEvent::Util::fh_nonblocking). |
78 | C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in |
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79 | that mode. |
77 | |
80 | |
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81 | =item connect => [$host, $service] [C<fh> or C<connect> MANDATORY] |
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82 | |
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83 | Try to connect to the specified host and service (port), using |
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84 | C<AnyEvent::Socket::tcp_connect>. The C<$host> additionally becomes the |
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85 | default C<peername>. |
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86 | |
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87 | You have to specify either this parameter, or C<fh>, above. |
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88 | |
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89 | When this parameter is specified, then the C<on_prepare>, |
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90 | C<on_connect_error> and C<on_connect> callbacks will be called under the |
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91 | appropriate circumstances: |
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92 | |
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93 | =over 4 |
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94 | |
78 | =item on_eof => $cb->($handle) |
95 | =item on_prepare => $cb->($handle) |
79 | |
96 | |
80 | Set the callback to be called when an end-of-file condition is detcted, |
97 | This (rarely used) callback is called before a new connection is |
81 | i.e. in the case of a socket, when the other side has closed the |
98 | attempted, but after the file handle has been created. It could be used to |
82 | connection cleanly. |
99 | prepare the file handle with parameters required for the actual connect |
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100 | (as opposed to settings that can be changed when the connection is already |
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101 | established). |
83 | |
102 | |
84 | While not mandatory, it is highly recommended to set an eof callback, |
103 | =item on_connect => $cb->($handle, $host, $port, $retry->()) |
85 | otherwise you might end up with a closed socket while you are still |
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86 | waiting for data. |
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87 | |
104 | |
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105 | This callback is called when a connection has been successfully established. |
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106 | |
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107 | The actual numeric host and port (the socket peername) are passed as |
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108 | parameters, together with a retry callback. |
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109 | |
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110 | When, for some reason, the handle is not acceptable, then calling |
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111 | C<$retry> will continue with the next conenction target (in case of |
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112 | multi-homed hosts or SRV records there can be multiple connection |
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113 | endpoints). When it is called then the read and write queues, eof status, |
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114 | tls status and similar properties of the handle are being reset. |
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115 | |
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116 | In most cases, ignoring the C<$retry> parameter is the way to go. |
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117 | |
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118 | =item on_connect_error => $cb->($handle, $message) |
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119 | |
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120 | This callback is called when the conenction could not be |
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121 | established. C<$!> will contain the relevant error code, and C<$message> a |
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122 | message describing it (usually the same as C<"$!">). |
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123 | |
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124 | If this callback isn't specified, then C<on_error> will be called with a |
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125 | fatal error instead. |
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126 | |
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127 | =back |
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128 | |
88 | =item on_error => $cb->($handle, $fatal) |
129 | =item on_error => $cb->($handle, $fatal, $message) |
89 | |
130 | |
90 | This is the error callback, which is called when, well, some error |
131 | This is the error callback, which is called when, well, some error |
91 | occured, such as not being able to resolve the hostname, failure to |
132 | occured, such as not being able to resolve the hostname, failure to |
92 | connect or a read error. |
133 | connect or a read error. |
93 | |
134 | |
94 | Some errors are fatal (which is indicated by C<$fatal> being true). On |
135 | Some errors are fatal (which is indicated by C<$fatal> being true). On |
95 | fatal errors the handle object will be shut down and will not be |
136 | fatal errors the handle object will be destroyed (by a call to C<< -> |
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137 | destroy >>) after invoking the error callback (which means you are free to |
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138 | examine the handle object). Examples of fatal errors are an EOF condition |
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139 | with active (but unsatisifable) read watchers (C<EPIPE>) or I/O errors. In |
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140 | cases where the other side can close the connection at their will it is |
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141 | often easiest to not report C<EPIPE> errors in this callback. |
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142 | |
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143 | AnyEvent::Handle tries to find an appropriate error code for you to check |
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144 | against, but in some cases (TLS errors), this does not work well. It is |
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145 | recommended to always output the C<$message> argument in human-readable |
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146 | error messages (it's usually the same as C<"$!">). |
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147 | |
96 | usable. Non-fatal errors can be retried by simply returning, but it is |
148 | Non-fatal errors can be retried by simply returning, but it is recommended |
97 | recommended to simply ignore this parameter and instead abondon the handle |
149 | to simply ignore this parameter and instead abondon the handle object |
98 | object when this callback is invoked. |
150 | when this callback is invoked. Examples of non-fatal errors are timeouts |
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151 | C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>). |
99 | |
152 | |
100 | On callback entrance, the value of C<$!> contains the operating system |
153 | On callback entrance, the value of C<$!> contains the operating system |
101 | error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>). |
154 | error code (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT>, C<EBADMSG> or |
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155 | C<EPROTO>). |
102 | |
156 | |
103 | While not mandatory, it is I<highly> recommended to set this callback, as |
157 | While not mandatory, it is I<highly> recommended to set this callback, as |
104 | you will not be notified of errors otherwise. The default simply calls |
158 | you will not be notified of errors otherwise. The default simply calls |
105 | C<croak>. |
159 | C<croak>. |
106 | |
160 | |
107 | =item on_read => $cb->($handle) |
161 | =item on_read => $cb->($handle) |
108 | |
162 | |
109 | This sets the default read callback, which is called when data arrives |
163 | This sets the default read callback, which is called when data arrives |
110 | and no read request is in the queue. |
164 | and no read request is in the queue (unlike read queue callbacks, this |
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165 | callback will only be called when at least one octet of data is in the |
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166 | read buffer). |
111 | |
167 | |
112 | To access (and remove data from) the read buffer, use the C<< ->rbuf >> |
168 | To access (and remove data from) the read buffer, use the C<< ->rbuf >> |
113 | method or access the C<$handle->{rbuf}> member directly. |
169 | method or access the C<< $handle->{rbuf} >> member directly. Note that you |
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170 | must not enlarge or modify the read buffer, you can only remove data at |
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171 | the beginning from it. |
114 | |
172 | |
115 | When an EOF condition is detected then AnyEvent::Handle will first try to |
173 | When an EOF condition is detected then AnyEvent::Handle will first try to |
116 | feed all the remaining data to the queued callbacks and C<on_read> before |
174 | feed all the remaining data to the queued callbacks and C<on_read> before |
117 | calling the C<on_eof> callback. If no progress can be made, then a fatal |
175 | calling the C<on_eof> callback. If no progress can be made, then a fatal |
118 | error will be raised (with C<$!> set to C<EPIPE>). |
176 | error will be raised (with C<$!> set to C<EPIPE>). |
119 | |
177 | |
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178 | Note that, unlike requests in the read queue, an C<on_read> callback |
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179 | doesn't mean you I<require> some data: if there is an EOF and there |
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180 | are outstanding read requests then an error will be flagged. With an |
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181 | C<on_read> callback, the C<on_eof> callback will be invoked. |
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182 | |
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183 | =item on_eof => $cb->($handle) |
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184 | |
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185 | Set the callback to be called when an end-of-file condition is detected, |
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186 | i.e. in the case of a socket, when the other side has closed the |
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187 | connection cleanly, and there are no outstanding read requests in the |
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188 | queue (if there are read requests, then an EOF counts as an unexpected |
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189 | connection close and will be flagged as an error). |
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190 | |
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191 | For sockets, this just means that the other side has stopped sending data, |
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192 | you can still try to write data, and, in fact, one can return from the EOF |
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193 | callback and continue writing data, as only the read part has been shut |
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194 | down. |
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195 | |
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196 | If an EOF condition has been detected but no C<on_eof> callback has been |
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197 | set, then a fatal error will be raised with C<$!> set to <0>. |
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198 | |
120 | =item on_drain => $cb->($handle) |
199 | =item on_drain => $cb->($handle) |
121 | |
200 | |
122 | This sets the callback that is called when the write buffer becomes empty |
201 | This sets the callback that is called when the write buffer becomes empty |
123 | (or when the callback is set and the buffer is empty already). |
202 | (or when the callback is set and the buffer is empty already). |
124 | |
203 | |
125 | To append to the write buffer, use the C<< ->push_write >> method. |
204 | To append to the write buffer, use the C<< ->push_write >> method. |
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205 | |
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206 | This callback is useful when you don't want to put all of your write data |
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207 | into the queue at once, for example, when you want to write the contents |
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208 | of some file to the socket you might not want to read the whole file into |
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209 | memory and push it into the queue, but instead only read more data from |
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210 | the file when the write queue becomes empty. |
126 | |
211 | |
127 | =item timeout => $fractional_seconds |
212 | =item timeout => $fractional_seconds |
128 | |
213 | |
129 | If non-zero, then this enables an "inactivity" timeout: whenever this many |
214 | If non-zero, then this enables an "inactivity" timeout: whenever this many |
130 | seconds pass without a successful read or write on the underlying file |
215 | seconds pass without a successful read or write on the underlying file |
131 | handle, the C<on_timeout> callback will be invoked (and if that one is |
216 | handle, the C<on_timeout> callback will be invoked (and if that one is |
132 | missing, an C<ETIMEDOUT> error will be raised). |
217 | missing, a non-fatal C<ETIMEDOUT> error will be raised). |
133 | |
218 | |
134 | Note that timeout processing is also active when you currently do not have |
219 | Note that timeout processing is also active when you currently do not have |
135 | any outstanding read or write requests: If you plan to keep the connection |
220 | any outstanding read or write requests: If you plan to keep the connection |
136 | idle then you should disable the timout temporarily or ignore the timeout |
221 | idle then you should disable the timout temporarily or ignore the timeout |
137 | in the C<on_timeout> callback. |
222 | in the C<on_timeout> callback, in which case AnyEvent::Handle will simply |
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223 | restart the timeout. |
138 | |
224 | |
139 | Zero (the default) disables this timeout. |
225 | Zero (the default) disables this timeout. |
140 | |
226 | |
141 | =item on_timeout => $cb->($handle) |
227 | =item on_timeout => $cb->($handle) |
142 | |
228 | |
… | |
… | |
146 | |
232 | |
147 | =item rbuf_max => <bytes> |
233 | =item rbuf_max => <bytes> |
148 | |
234 | |
149 | If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>) |
235 | If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>) |
150 | when the read buffer ever (strictly) exceeds this size. This is useful to |
236 | when the read buffer ever (strictly) exceeds this size. This is useful to |
151 | avoid denial-of-service attacks. |
237 | avoid some forms of denial-of-service attacks. |
152 | |
238 | |
153 | For example, a server accepting connections from untrusted sources should |
239 | For example, a server accepting connections from untrusted sources should |
154 | be configured to accept only so-and-so much data that it cannot act on |
240 | be configured to accept only so-and-so much data that it cannot act on |
155 | (for example, when expecting a line, an attacker could send an unlimited |
241 | (for example, when expecting a line, an attacker could send an unlimited |
156 | amount of data without a callback ever being called as long as the line |
242 | amount of data without a callback ever being called as long as the line |
157 | isn't finished). |
243 | isn't finished). |
158 | |
244 | |
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245 | =item autocork => <boolean> |
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246 | |
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247 | When disabled (the default), then C<push_write> will try to immediately |
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248 | write the data to the handle, if possible. This avoids having to register |
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249 | a write watcher and wait for the next event loop iteration, but can |
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250 | be inefficient if you write multiple small chunks (on the wire, this |
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251 | disadvantage is usually avoided by your kernel's nagle algorithm, see |
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252 | C<no_delay>, but this option can save costly syscalls). |
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253 | |
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254 | When enabled, then writes will always be queued till the next event loop |
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255 | iteration. This is efficient when you do many small writes per iteration, |
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256 | but less efficient when you do a single write only per iteration (or when |
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257 | the write buffer often is full). It also increases write latency. |
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258 | |
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259 | =item no_delay => <boolean> |
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260 | |
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261 | When doing small writes on sockets, your operating system kernel might |
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262 | wait a bit for more data before actually sending it out. This is called |
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263 | the Nagle algorithm, and usually it is beneficial. |
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264 | |
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265 | In some situations you want as low a delay as possible, which can be |
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266 | accomplishd by setting this option to a true value. |
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267 | |
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268 | The default is your opertaing system's default behaviour (most likely |
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269 | enabled), this option explicitly enables or disables it, if possible. |
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270 | |
159 | =item read_size => <bytes> |
271 | =item read_size => <bytes> |
160 | |
272 | |
161 | The default read block size (the amount of bytes this module will try to read |
273 | The default read block size (the amount of bytes this module will |
162 | during each (loop iteration). Default: C<8192>. |
274 | try to read during each loop iteration, which affects memory |
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275 | requirements). Default: C<8192>. |
163 | |
276 | |
164 | =item low_water_mark => <bytes> |
277 | =item low_water_mark => <bytes> |
165 | |
278 | |
166 | Sets the amount of bytes (default: C<0>) that make up an "empty" write |
279 | Sets the amount of bytes (default: C<0>) that make up an "empty" write |
167 | buffer: If the write reaches this size or gets even samller it is |
280 | buffer: If the write reaches this size or gets even samller it is |
168 | considered empty. |
281 | considered empty. |
169 | |
282 | |
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283 | Sometimes it can be beneficial (for performance reasons) to add data to |
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284 | the write buffer before it is fully drained, but this is a rare case, as |
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285 | the operating system kernel usually buffers data as well, so the default |
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286 | is good in almost all cases. |
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287 | |
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288 | =item linger => <seconds> |
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289 | |
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290 | If non-zero (default: C<3600>), then the destructor of the |
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291 | AnyEvent::Handle object will check whether there is still outstanding |
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292 | write data and will install a watcher that will write this data to the |
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293 | socket. No errors will be reported (this mostly matches how the operating |
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294 | system treats outstanding data at socket close time). |
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295 | |
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296 | This will not work for partial TLS data that could not be encoded |
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297 | yet. This data will be lost. Calling the C<stoptls> method in time might |
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298 | help. |
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299 | |
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300 | =item peername => $string |
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301 | |
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302 | A string used to identify the remote site - usually the DNS hostname |
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303 | (I<not> IDN!) used to create the connection, rarely the IP address. |
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304 | |
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305 | Apart from being useful in error messages, this string is also used in TLS |
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306 | peername verification (see C<verify_peername> in L<AnyEvent::TLS>). This |
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307 | verification will be skipped when C<peername> is not specified or |
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308 | C<undef>. |
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309 | |
170 | =item tls => "accept" | "connect" | Net::SSLeay::SSL object |
310 | =item tls => "accept" | "connect" | Net::SSLeay::SSL object |
171 | |
311 | |
172 | When this parameter is given, it enables TLS (SSL) mode, that means it |
312 | When this parameter is given, it enables TLS (SSL) mode, that means |
173 | will start making tls handshake and will transparently encrypt/decrypt |
313 | AnyEvent will start a TLS handshake as soon as the conenction has been |
174 | data. |
314 | established and will transparently encrypt/decrypt data afterwards. |
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315 | |
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316 | All TLS protocol errors will be signalled as C<EPROTO>, with an |
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317 | appropriate error message. |
175 | |
318 | |
176 | TLS mode requires Net::SSLeay to be installed (it will be loaded |
319 | TLS mode requires Net::SSLeay to be installed (it will be loaded |
177 | automatically when you try to create a TLS handle). |
320 | automatically when you try to create a TLS handle): this module doesn't |
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321 | have a dependency on that module, so if your module requires it, you have |
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322 | to add the dependency yourself. |
178 | |
323 | |
179 | For the TLS server side, use C<accept>, and for the TLS client side of a |
324 | Unlike TCP, TLS has a server and client side: for the TLS server side, use |
180 | connection, use C<connect> mode. |
325 | C<accept>, and for the TLS client side of a connection, use C<connect> |
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326 | mode. |
181 | |
327 | |
182 | You can also provide your own TLS connection object, but you have |
328 | You can also provide your own TLS connection object, but you have |
183 | to make sure that you call either C<Net::SSLeay::set_connect_state> |
329 | to make sure that you call either C<Net::SSLeay::set_connect_state> |
184 | or C<Net::SSLeay::set_accept_state> on it before you pass it to |
330 | or C<Net::SSLeay::set_accept_state> on it before you pass it to |
185 | AnyEvent::Handle. |
331 | AnyEvent::Handle. Also, this module will take ownership of this connection |
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332 | object. |
186 | |
333 | |
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334 | At some future point, AnyEvent::Handle might switch to another TLS |
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335 | implementation, then the option to use your own session object will go |
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336 | away. |
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337 | |
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338 | B<IMPORTANT:> since Net::SSLeay "objects" are really only integers, |
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339 | passing in the wrong integer will lead to certain crash. This most often |
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340 | happens when one uses a stylish C<< tls => 1 >> and is surprised about the |
|
|
341 | segmentation fault. |
|
|
342 | |
187 | See the C<starttls> method if you need to start TLs negotiation later. |
343 | See the C<< ->starttls >> method for when need to start TLS negotiation later. |
188 | |
344 | |
189 | =item tls_ctx => $ssl_ctx |
345 | =item tls_ctx => $anyevent_tls |
190 | |
346 | |
191 | Use the given Net::SSLeay::CTX object to create the new TLS connection |
347 | Use the given C<AnyEvent::TLS> object to create the new TLS connection |
192 | (unless a connection object was specified directly). If this parameter is |
348 | (unless a connection object was specified directly). If this parameter is |
193 | missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>. |
349 | missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>. |
194 | |
350 | |
|
|
351 | Instead of an object, you can also specify a hash reference with C<< key |
|
|
352 | => value >> pairs. Those will be passed to L<AnyEvent::TLS> to create a |
|
|
353 | new TLS context object. |
|
|
354 | |
|
|
355 | =item on_starttls => $cb->($handle, $success[, $error_message]) |
|
|
356 | |
|
|
357 | This callback will be invoked when the TLS/SSL handshake has finished. If |
|
|
358 | C<$success> is true, then the TLS handshake succeeded, otherwise it failed |
|
|
359 | (C<on_stoptls> will not be called in this case). |
|
|
360 | |
|
|
361 | The session in C<< $handle->{tls} >> can still be examined in this |
|
|
362 | callback, even when the handshake was not successful. |
|
|
363 | |
|
|
364 | TLS handshake failures will not cause C<on_error> to be invoked when this |
|
|
365 | callback is in effect, instead, the error message will be passed to C<on_starttls>. |
|
|
366 | |
|
|
367 | Without this callback, handshake failures lead to C<on_error> being |
|
|
368 | called, as normal. |
|
|
369 | |
|
|
370 | Note that you cannot call C<starttls> right again in this callback. If you |
|
|
371 | need to do that, start an zero-second timer instead whose callback can |
|
|
372 | then call C<< ->starttls >> again. |
|
|
373 | |
|
|
374 | =item on_stoptls => $cb->($handle) |
|
|
375 | |
|
|
376 | When a SSLv3/TLS shutdown/close notify/EOF is detected and this callback is |
|
|
377 | set, then it will be invoked after freeing the TLS session. If it is not, |
|
|
378 | then a TLS shutdown condition will be treated like a normal EOF condition |
|
|
379 | on the handle. |
|
|
380 | |
|
|
381 | The session in C<< $handle->{tls} >> can still be examined in this |
|
|
382 | callback. |
|
|
383 | |
|
|
384 | This callback will only be called on TLS shutdowns, not when the |
|
|
385 | underlying handle signals EOF. |
|
|
386 | |
195 | =item json => JSON or JSON::XS object |
387 | =item json => JSON or JSON::XS object |
196 | |
388 | |
197 | This is the json coder object used by the C<json> read and write types. |
389 | This is the json coder object used by the C<json> read and write types. |
198 | |
390 | |
199 | If you don't supply it, then AnyEvent::Handle will create and use a |
391 | If you don't supply it, then AnyEvent::Handle will create and use a |
200 | suitable one, which will write and expect UTF-8 encoded JSON texts. |
392 | suitable one (on demand), which will write and expect UTF-8 encoded JSON |
|
|
393 | texts. |
201 | |
394 | |
202 | Note that you are responsible to depend on the JSON module if you want to |
395 | Note that you are responsible to depend on the JSON module if you want to |
203 | use this functionality, as AnyEvent does not have a dependency itself. |
396 | use this functionality, as AnyEvent does not have a dependency itself. |
204 | |
397 | |
205 | =item filter_r => $cb |
|
|
206 | |
|
|
207 | =item filter_w => $cb |
|
|
208 | |
|
|
209 | These exist, but are undocumented at this time. |
|
|
210 | |
|
|
211 | =back |
398 | =back |
212 | |
399 | |
213 | =cut |
400 | =cut |
214 | |
401 | |
215 | sub new { |
402 | sub new { |
216 | my $class = shift; |
403 | my $class = shift; |
217 | |
|
|
218 | my $self = bless { @_ }, $class; |
404 | my $self = bless { @_ }, $class; |
219 | |
405 | |
220 | $self->{fh} or Carp::croak "mandatory argument fh is missing"; |
406 | if ($self->{fh}) { |
|
|
407 | $self->_start; |
|
|
408 | return unless $self->{fh}; # could be gone by now |
|
|
409 | |
|
|
410 | } elsif ($self->{connect}) { |
|
|
411 | require AnyEvent::Socket; |
|
|
412 | |
|
|
413 | $self->{peername} = $self->{connect}[0] |
|
|
414 | unless exists $self->{peername}; |
|
|
415 | |
|
|
416 | $self->{_skip_drain_rbuf} = 1; |
|
|
417 | |
|
|
418 | { |
|
|
419 | Scalar::Util::weaken (my $self = $self); |
|
|
420 | |
|
|
421 | $self->{_connect} = |
|
|
422 | AnyEvent::Socket::tcp_connect ( |
|
|
423 | $self->{connect}[0], |
|
|
424 | $self->{connect}[1], |
|
|
425 | sub { |
|
|
426 | my ($fh, $host, $port, $retry) = @_; |
|
|
427 | |
|
|
428 | if ($fh) { |
|
|
429 | $self->{fh} = $fh; |
|
|
430 | |
|
|
431 | delete $self->{_skip_drain_rbuf}; |
|
|
432 | $self->_start; |
|
|
433 | |
|
|
434 | $self->{on_connect} |
|
|
435 | and $self->{on_connect}($self, $host, $port, sub { |
|
|
436 | delete @$self{qw(fh _tw _ww _rw _eof _queue rbuf _wbuf tls _tls_rbuf _tls_wbuf)}; |
|
|
437 | $self->{_skip_drain_rbuf} = 1; |
|
|
438 | &$retry; |
|
|
439 | }); |
|
|
440 | |
|
|
441 | } else { |
|
|
442 | if ($self->{on_connect_error}) { |
|
|
443 | $self->{on_connect_error}($self, "$!"); |
|
|
444 | $self->destroy; |
|
|
445 | } else { |
|
|
446 | $self->fatal ($!, 1); |
|
|
447 | } |
|
|
448 | } |
|
|
449 | }, |
|
|
450 | sub { |
|
|
451 | local $self->{fh} = $_[0]; |
|
|
452 | |
|
|
453 | $self->{on_prepare}->($self) |
|
|
454 | if $self->{on_prepare}; |
|
|
455 | } |
|
|
456 | ); |
|
|
457 | } |
|
|
458 | |
|
|
459 | } else { |
|
|
460 | Carp::croak "AnyEvent::Handle: either an existing fh or the connect parameter must be specified"; |
|
|
461 | } |
|
|
462 | |
|
|
463 | $self |
|
|
464 | } |
|
|
465 | |
|
|
466 | sub _start { |
|
|
467 | my ($self) = @_; |
221 | |
468 | |
222 | AnyEvent::Util::fh_nonblocking $self->{fh}, 1; |
469 | AnyEvent::Util::fh_nonblocking $self->{fh}, 1; |
223 | |
|
|
224 | if ($self->{tls}) { |
|
|
225 | require Net::SSLeay; |
|
|
226 | $self->starttls (delete $self->{tls}, delete $self->{tls_ctx}); |
|
|
227 | } |
|
|
228 | |
|
|
229 | # $self->on_eof (delete $self->{on_eof} ) if $self->{on_eof}; # nop |
|
|
230 | # $self->on_error (delete $self->{on_error}) if $self->{on_error}; # nop |
|
|
231 | # $self->on_read (delete $self->{on_read} ) if $self->{on_read}; # nop |
|
|
232 | $self->on_drain (delete $self->{on_drain}) if $self->{on_drain}; |
|
|
233 | |
470 | |
234 | $self->{_activity} = AnyEvent->now; |
471 | $self->{_activity} = AnyEvent->now; |
235 | $self->_timeout; |
472 | $self->_timeout; |
236 | |
473 | |
|
|
474 | $self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay}; |
|
|
475 | |
|
|
476 | $self->starttls (delete $self->{tls}, delete $self->{tls_ctx}) |
|
|
477 | if $self->{tls}; |
|
|
478 | |
|
|
479 | $self->on_drain (delete $self->{on_drain}) if $self->{on_drain}; |
|
|
480 | |
237 | $self->start_read; |
481 | $self->start_read |
238 | |
482 | if $self->{on_read} || @{ $self->{_queue} }; |
239 | $self |
|
|
240 | } |
483 | } |
241 | |
484 | |
242 | sub _shutdown { |
485 | #sub _shutdown { |
243 | my ($self) = @_; |
486 | # my ($self) = @_; |
244 | |
487 | # |
245 | delete $self->{_tw}; |
488 | # delete @$self{qw(_tw _rw _ww fh wbuf on_read _queue)}; |
246 | delete $self->{_rw}; |
489 | # $self->{_eof} = 1; # tell starttls et. al to stop trying |
247 | delete $self->{_ww}; |
490 | # |
248 | delete $self->{fh}; |
491 | # &_freetls; |
249 | |
492 | #} |
250 | $self->stoptls; |
|
|
251 | } |
|
|
252 | |
493 | |
253 | sub _error { |
494 | sub _error { |
254 | my ($self, $errno, $fatal) = @_; |
495 | my ($self, $errno, $fatal, $message) = @_; |
255 | |
|
|
256 | $self->_shutdown |
|
|
257 | if $fatal; |
|
|
258 | |
496 | |
259 | $! = $errno; |
497 | $! = $errno; |
|
|
498 | $message ||= "$!"; |
260 | |
499 | |
261 | if ($self->{on_error}) { |
500 | if ($self->{on_error}) { |
262 | $self->{on_error}($self, $fatal); |
501 | $self->{on_error}($self, $fatal, $message); |
263 | } else { |
502 | $self->destroy if $fatal; |
|
|
503 | } elsif ($self->{fh}) { |
|
|
504 | $self->destroy; |
264 | Carp::croak "AnyEvent::Handle uncaught error: $!"; |
505 | Carp::croak "AnyEvent::Handle uncaught error: $message"; |
265 | } |
506 | } |
266 | } |
507 | } |
267 | |
508 | |
268 | =item $fh = $handle->fh |
509 | =item $fh = $handle->fh |
269 | |
510 | |
270 | This method returns the file handle of the L<AnyEvent::Handle> object. |
511 | This method returns the file handle used to create the L<AnyEvent::Handle> object. |
271 | |
512 | |
272 | =cut |
513 | =cut |
273 | |
514 | |
274 | sub fh { $_[0]{fh} } |
515 | sub fh { $_[0]{fh} } |
275 | |
516 | |
… | |
… | |
293 | $_[0]{on_eof} = $_[1]; |
534 | $_[0]{on_eof} = $_[1]; |
294 | } |
535 | } |
295 | |
536 | |
296 | =item $handle->on_timeout ($cb) |
537 | =item $handle->on_timeout ($cb) |
297 | |
538 | |
298 | Replace the current C<on_timeout> callback, or disables the callback |
539 | Replace the current C<on_timeout> callback, or disables the callback (but |
299 | (but not the timeout) if C<$cb> = C<undef>. See C<timeout> constructor |
540 | not the timeout) if C<$cb> = C<undef>. See the C<timeout> constructor |
300 | argument. |
541 | argument and method. |
301 | |
542 | |
302 | =cut |
543 | =cut |
303 | |
544 | |
304 | sub on_timeout { |
545 | sub on_timeout { |
305 | $_[0]{on_timeout} = $_[1]; |
546 | $_[0]{on_timeout} = $_[1]; |
|
|
547 | } |
|
|
548 | |
|
|
549 | =item $handle->autocork ($boolean) |
|
|
550 | |
|
|
551 | Enables or disables the current autocork behaviour (see C<autocork> |
|
|
552 | constructor argument). Changes will only take effect on the next write. |
|
|
553 | |
|
|
554 | =cut |
|
|
555 | |
|
|
556 | sub autocork { |
|
|
557 | $_[0]{autocork} = $_[1]; |
|
|
558 | } |
|
|
559 | |
|
|
560 | =item $handle->no_delay ($boolean) |
|
|
561 | |
|
|
562 | Enables or disables the C<no_delay> setting (see constructor argument of |
|
|
563 | the same name for details). |
|
|
564 | |
|
|
565 | =cut |
|
|
566 | |
|
|
567 | sub no_delay { |
|
|
568 | $_[0]{no_delay} = $_[1]; |
|
|
569 | |
|
|
570 | eval { |
|
|
571 | local $SIG{__DIE__}; |
|
|
572 | setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1] |
|
|
573 | if $_[0]{fh}; |
|
|
574 | }; |
|
|
575 | } |
|
|
576 | |
|
|
577 | =item $handle->on_starttls ($cb) |
|
|
578 | |
|
|
579 | Replace the current C<on_starttls> callback (see the C<on_starttls> constructor argument). |
|
|
580 | |
|
|
581 | =cut |
|
|
582 | |
|
|
583 | sub on_starttls { |
|
|
584 | $_[0]{on_starttls} = $_[1]; |
|
|
585 | } |
|
|
586 | |
|
|
587 | =item $handle->on_stoptls ($cb) |
|
|
588 | |
|
|
589 | Replace the current C<on_stoptls> callback (see the C<on_stoptls> constructor argument). |
|
|
590 | |
|
|
591 | =cut |
|
|
592 | |
|
|
593 | sub on_starttls { |
|
|
594 | $_[0]{on_stoptls} = $_[1]; |
306 | } |
595 | } |
307 | |
596 | |
308 | ############################################################################# |
597 | ############################################################################# |
309 | |
598 | |
310 | =item $handle->timeout ($seconds) |
599 | =item $handle->timeout ($seconds) |
… | |
… | |
323 | # reset the timeout watcher, as neccessary |
612 | # reset the timeout watcher, as neccessary |
324 | # also check for time-outs |
613 | # also check for time-outs |
325 | sub _timeout { |
614 | sub _timeout { |
326 | my ($self) = @_; |
615 | my ($self) = @_; |
327 | |
616 | |
328 | if ($self->{timeout}) { |
617 | if ($self->{timeout} && $self->{fh}) { |
329 | my $NOW = AnyEvent->now; |
618 | my $NOW = AnyEvent->now; |
330 | |
619 | |
331 | # when would the timeout trigger? |
620 | # when would the timeout trigger? |
332 | my $after = $self->{_activity} + $self->{timeout} - $NOW; |
621 | my $after = $self->{_activity} + $self->{timeout} - $NOW; |
333 | |
622 | |
… | |
… | |
336 | $self->{_activity} = $NOW; |
625 | $self->{_activity} = $NOW; |
337 | |
626 | |
338 | if ($self->{on_timeout}) { |
627 | if ($self->{on_timeout}) { |
339 | $self->{on_timeout}($self); |
628 | $self->{on_timeout}($self); |
340 | } else { |
629 | } else { |
341 | $self->_error (&Errno::ETIMEDOUT); |
630 | $self->_error (Errno::ETIMEDOUT); |
342 | } |
631 | } |
343 | |
632 | |
344 | # callbakx could have changed timeout value, optimise |
633 | # callback could have changed timeout value, optimise |
345 | return unless $self->{timeout}; |
634 | return unless $self->{timeout}; |
346 | |
635 | |
347 | # calculate new after |
636 | # calculate new after |
348 | $after = $self->{timeout}; |
637 | $after = $self->{timeout}; |
349 | } |
638 | } |
350 | |
639 | |
351 | Scalar::Util::weaken $self; |
640 | Scalar::Util::weaken $self; |
|
|
641 | return unless $self; # ->error could have destroyed $self |
352 | |
642 | |
353 | $self->{_tw} ||= AnyEvent->timer (after => $after, cb => sub { |
643 | $self->{_tw} ||= AnyEvent->timer (after => $after, cb => sub { |
354 | delete $self->{_tw}; |
644 | delete $self->{_tw}; |
355 | $self->_timeout; |
645 | $self->_timeout; |
356 | }); |
646 | }); |
… | |
… | |
387 | my ($self, $cb) = @_; |
677 | my ($self, $cb) = @_; |
388 | |
678 | |
389 | $self->{on_drain} = $cb; |
679 | $self->{on_drain} = $cb; |
390 | |
680 | |
391 | $cb->($self) |
681 | $cb->($self) |
392 | if $cb && $self->{low_water_mark} >= length $self->{wbuf}; |
682 | if $cb && $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf}); |
393 | } |
683 | } |
394 | |
684 | |
395 | =item $handle->push_write ($data) |
685 | =item $handle->push_write ($data) |
396 | |
686 | |
397 | Queues the given scalar to be written. You can push as much data as you |
687 | Queues the given scalar to be written. You can push as much data as you |
… | |
… | |
408 | Scalar::Util::weaken $self; |
698 | Scalar::Util::weaken $self; |
409 | |
699 | |
410 | my $cb = sub { |
700 | my $cb = sub { |
411 | my $len = syswrite $self->{fh}, $self->{wbuf}; |
701 | my $len = syswrite $self->{fh}, $self->{wbuf}; |
412 | |
702 | |
413 | if ($len >= 0) { |
703 | if (defined $len) { |
414 | substr $self->{wbuf}, 0, $len, ""; |
704 | substr $self->{wbuf}, 0, $len, ""; |
415 | |
705 | |
416 | $self->{_activity} = AnyEvent->now; |
706 | $self->{_activity} = AnyEvent->now; |
417 | |
707 | |
418 | $self->{on_drain}($self) |
708 | $self->{on_drain}($self) |
419 | if $self->{low_water_mark} >= length $self->{wbuf} |
709 | if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf}) |
420 | && $self->{on_drain}; |
710 | && $self->{on_drain}; |
421 | |
711 | |
422 | delete $self->{_ww} unless length $self->{wbuf}; |
712 | delete $self->{_ww} unless length $self->{wbuf}; |
423 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) { |
713 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) { |
424 | $self->_error ($!, 1); |
714 | $self->_error ($!, 1); |
425 | } |
715 | } |
426 | }; |
716 | }; |
427 | |
717 | |
428 | # try to write data immediately |
718 | # try to write data immediately |
429 | $cb->(); |
719 | $cb->() unless $self->{autocork}; |
430 | |
720 | |
431 | # if still data left in wbuf, we need to poll |
721 | # if still data left in wbuf, we need to poll |
432 | $self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb) |
722 | $self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb) |
433 | if length $self->{wbuf}; |
723 | if length $self->{wbuf}; |
434 | }; |
724 | }; |
… | |
… | |
448 | |
738 | |
449 | @_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write") |
739 | @_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write") |
450 | ->($self, @_); |
740 | ->($self, @_); |
451 | } |
741 | } |
452 | |
742 | |
453 | if ($self->{filter_w}) { |
743 | if ($self->{tls}) { |
454 | $self->{filter_w}($self, \$_[0]); |
744 | $self->{_tls_wbuf} .= $_[0]; |
|
|
745 | |
|
|
746 | &_dotls ($self); |
455 | } else { |
747 | } else { |
456 | $self->{wbuf} .= $_[0]; |
748 | $self->{wbuf} .= $_[0]; |
457 | $self->_drain_wbuf; |
749 | $self->_drain_wbuf if $self->{fh}; |
458 | } |
750 | } |
459 | } |
751 | } |
460 | |
752 | |
461 | =item $handle->push_write (type => @args) |
753 | =item $handle->push_write (type => @args) |
462 | |
754 | |
… | |
… | |
476 | =cut |
768 | =cut |
477 | |
769 | |
478 | register_write_type netstring => sub { |
770 | register_write_type netstring => sub { |
479 | my ($self, $string) = @_; |
771 | my ($self, $string) = @_; |
480 | |
772 | |
481 | sprintf "%d:%s,", (length $string), $string |
773 | (length $string) . ":$string," |
|
|
774 | }; |
|
|
775 | |
|
|
776 | =item packstring => $format, $data |
|
|
777 | |
|
|
778 | An octet string prefixed with an encoded length. The encoding C<$format> |
|
|
779 | uses the same format as a Perl C<pack> format, but must specify a single |
|
|
780 | integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an |
|
|
781 | optional C<!>, C<< < >> or C<< > >> modifier). |
|
|
782 | |
|
|
783 | =cut |
|
|
784 | |
|
|
785 | register_write_type packstring => sub { |
|
|
786 | my ($self, $format, $string) = @_; |
|
|
787 | |
|
|
788 | pack "$format/a*", $string |
482 | }; |
789 | }; |
483 | |
790 | |
484 | =item json => $array_or_hashref |
791 | =item json => $array_or_hashref |
485 | |
792 | |
486 | Encodes the given hash or array reference into a JSON object. Unless you |
793 | Encodes the given hash or array reference into a JSON object. Unless you |
… | |
… | |
520 | |
827 | |
521 | $self->{json} ? $self->{json}->encode ($ref) |
828 | $self->{json} ? $self->{json}->encode ($ref) |
522 | : JSON::encode_json ($ref) |
829 | : JSON::encode_json ($ref) |
523 | }; |
830 | }; |
524 | |
831 | |
|
|
832 | =item storable => $reference |
|
|
833 | |
|
|
834 | Freezes the given reference using L<Storable> and writes it to the |
|
|
835 | handle. Uses the C<nfreeze> format. |
|
|
836 | |
|
|
837 | =cut |
|
|
838 | |
|
|
839 | register_write_type storable => sub { |
|
|
840 | my ($self, $ref) = @_; |
|
|
841 | |
|
|
842 | require Storable; |
|
|
843 | |
|
|
844 | pack "w/a*", Storable::nfreeze ($ref) |
|
|
845 | }; |
|
|
846 | |
|
|
847 | =back |
|
|
848 | |
|
|
849 | =item $handle->push_shutdown |
|
|
850 | |
|
|
851 | Sometimes you know you want to close the socket after writing your data |
|
|
852 | before it was actually written. One way to do that is to replace your |
|
|
853 | C<on_drain> handler by a callback that shuts down the socket (and set |
|
|
854 | C<low_water_mark> to C<0>). This method is a shorthand for just that, and |
|
|
855 | replaces the C<on_drain> callback with: |
|
|
856 | |
|
|
857 | sub { shutdown $_[0]{fh}, 1 } # for push_shutdown |
|
|
858 | |
|
|
859 | This simply shuts down the write side and signals an EOF condition to the |
|
|
860 | the peer. |
|
|
861 | |
|
|
862 | You can rely on the normal read queue and C<on_eof> handling |
|
|
863 | afterwards. This is the cleanest way to close a connection. |
|
|
864 | |
|
|
865 | =cut |
|
|
866 | |
|
|
867 | sub push_shutdown { |
|
|
868 | my ($self) = @_; |
|
|
869 | |
|
|
870 | delete $self->{low_water_mark}; |
|
|
871 | $self->on_drain (sub { shutdown $_[0]{fh}, 1 }); |
|
|
872 | } |
|
|
873 | |
525 | =item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args) |
874 | =item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args) |
526 | |
875 | |
527 | This function (not method) lets you add your own types to C<push_write>. |
876 | This function (not method) lets you add your own types to C<push_write>. |
528 | Whenever the given C<type> is used, C<push_write> will invoke the code |
877 | Whenever the given C<type> is used, C<push_write> will invoke the code |
529 | reference with the handle object and the remaining arguments. |
878 | reference with the handle object and the remaining arguments. |
… | |
… | |
532 | be appended to the write buffer. |
881 | be appended to the write buffer. |
533 | |
882 | |
534 | Note that this is a function, and all types registered this way will be |
883 | Note that this is a function, and all types registered this way will be |
535 | global, so try to use unique names. |
884 | global, so try to use unique names. |
536 | |
885 | |
537 | =back |
|
|
538 | |
|
|
539 | =cut |
886 | =cut |
540 | |
887 | |
541 | ############################################################################# |
888 | ############################################################################# |
542 | |
889 | |
543 | =back |
890 | =back |
… | |
… | |
551 | ways, the "simple" way, using only C<on_read> and the "complex" way, using |
898 | ways, the "simple" way, using only C<on_read> and the "complex" way, using |
552 | a queue. |
899 | a queue. |
553 | |
900 | |
554 | In the simple case, you just install an C<on_read> callback and whenever |
901 | In the simple case, you just install an C<on_read> callback and whenever |
555 | new data arrives, it will be called. You can then remove some data (if |
902 | new data arrives, it will be called. You can then remove some data (if |
556 | enough is there) from the read buffer (C<< $handle->rbuf >>) if you want |
903 | enough is there) from the read buffer (C<< $handle->rbuf >>). Or you cna |
557 | or not. |
904 | leave the data there if you want to accumulate more (e.g. when only a |
|
|
905 | partial message has been received so far). |
558 | |
906 | |
559 | In the more complex case, you want to queue multiple callbacks. In this |
907 | In the more complex case, you want to queue multiple callbacks. In this |
560 | case, AnyEvent::Handle will call the first queued callback each time new |
908 | case, AnyEvent::Handle will call the first queued callback each time new |
561 | data arrives and removes it when it has done its job (see C<push_read>, |
909 | data arrives (also the first time it is queued) and removes it when it has |
562 | below). |
910 | done its job (see C<push_read>, below). |
563 | |
911 | |
564 | This way you can, for example, push three line-reads, followed by reading |
912 | This way you can, for example, push three line-reads, followed by reading |
565 | a chunk of data, and AnyEvent::Handle will execute them in order. |
913 | a chunk of data, and AnyEvent::Handle will execute them in order. |
566 | |
914 | |
567 | Example 1: EPP protocol parser. EPP sends 4 byte length info, followed by |
915 | Example 1: EPP protocol parser. EPP sends 4 byte length info, followed by |
… | |
… | |
580 | # handle xml |
928 | # handle xml |
581 | }); |
929 | }); |
582 | }); |
930 | }); |
583 | }); |
931 | }); |
584 | |
932 | |
585 | Example 2: Implement a client for a protocol that replies either with |
933 | Example 2: Implement a client for a protocol that replies either with "OK" |
586 | "OK" and another line or "ERROR" for one request, and 64 bytes for the |
934 | and another line or "ERROR" for the first request that is sent, and 64 |
587 | second request. Due tot he availability of a full queue, we can just |
935 | bytes for the second request. Due to the availability of a queue, we can |
588 | pipeline sending both requests and manipulate the queue as necessary in |
936 | just pipeline sending both requests and manipulate the queue as necessary |
589 | the callbacks: |
937 | in the callbacks. |
590 | |
938 | |
591 | # request one |
939 | When the first callback is called and sees an "OK" response, it will |
|
|
940 | C<unshift> another line-read. This line-read will be queued I<before> the |
|
|
941 | 64-byte chunk callback. |
|
|
942 | |
|
|
943 | # request one, returns either "OK + extra line" or "ERROR" |
592 | $handle->push_write ("request 1\015\012"); |
944 | $handle->push_write ("request 1\015\012"); |
593 | |
945 | |
594 | # we expect "ERROR" or "OK" as response, so push a line read |
946 | # we expect "ERROR" or "OK" as response, so push a line read |
595 | $handle->push_read (line => sub { |
947 | $handle->push_read (line => sub { |
596 | # if we got an "OK", we have to _prepend_ another line, |
948 | # if we got an "OK", we have to _prepend_ another line, |
… | |
… | |
603 | ... |
955 | ... |
604 | }); |
956 | }); |
605 | } |
957 | } |
606 | }); |
958 | }); |
607 | |
959 | |
608 | # request two |
960 | # request two, simply returns 64 octets |
609 | $handle->push_write ("request 2\015\012"); |
961 | $handle->push_write ("request 2\015\012"); |
610 | |
962 | |
611 | # simply read 64 bytes, always |
963 | # simply read 64 bytes, always |
612 | $handle->push_read (chunk => 64, sub { |
964 | $handle->push_read (chunk => 64, sub { |
613 | my $response = $_[1]; |
965 | my $response = $_[1]; |
… | |
… | |
619 | =cut |
971 | =cut |
620 | |
972 | |
621 | sub _drain_rbuf { |
973 | sub _drain_rbuf { |
622 | my ($self) = @_; |
974 | my ($self) = @_; |
623 | |
975 | |
|
|
976 | # avoid recursion |
|
|
977 | return if exists $self->{_skip_drain_rbuf}; |
|
|
978 | local $self->{_skip_drain_rbuf} = 1; |
|
|
979 | |
624 | if ( |
980 | if ( |
625 | defined $self->{rbuf_max} |
981 | defined $self->{rbuf_max} |
626 | && $self->{rbuf_max} < length $self->{rbuf} |
982 | && $self->{rbuf_max} < length $self->{rbuf} |
627 | ) { |
983 | ) { |
628 | return $self->_error (&Errno::ENOSPC, 1); |
984 | $self->_error (Errno::ENOSPC, 1), return; |
629 | } |
985 | } |
630 | |
986 | |
631 | return if $self->{in_drain}; |
987 | while () { |
632 | local $self->{in_drain} = 1; |
988 | # we need to use a separate tls read buffer, as we must not receive data while |
|
|
989 | # we are draining the buffer, and this can only happen with TLS. |
|
|
990 | $self->{rbuf} .= delete $self->{_tls_rbuf} if exists $self->{_tls_rbuf}; |
633 | |
991 | |
634 | while (my $len = length $self->{rbuf}) { |
992 | my $len = length $self->{rbuf}; |
635 | no strict 'refs'; |
993 | |
636 | if (my $cb = shift @{ $self->{_queue} }) { |
994 | if (my $cb = shift @{ $self->{_queue} }) { |
637 | unless ($cb->($self)) { |
995 | unless ($cb->($self)) { |
638 | if ($self->{_eof}) { |
996 | if ($self->{_eof}) { |
639 | # no progress can be made (not enough data and no data forthcoming) |
997 | # no progress can be made (not enough data and no data forthcoming) |
640 | return $self->_error (&Errno::EPIPE, 1); |
998 | $self->_error (Errno::EPIPE, 1), return; |
641 | } |
999 | } |
642 | |
1000 | |
643 | unshift @{ $self->{_queue} }, $cb; |
1001 | unshift @{ $self->{_queue} }, $cb; |
644 | return; |
1002 | last; |
645 | } |
1003 | } |
646 | } elsif ($self->{on_read}) { |
1004 | } elsif ($self->{on_read}) { |
|
|
1005 | last unless $len; |
|
|
1006 | |
647 | $self->{on_read}($self); |
1007 | $self->{on_read}($self); |
648 | |
1008 | |
649 | if ( |
1009 | if ( |
650 | $self->{_eof} # if no further data will arrive |
|
|
651 | && $len == length $self->{rbuf} # and no data has been consumed |
1010 | $len == length $self->{rbuf} # if no data has been consumed |
652 | && !@{ $self->{_queue} } # and the queue is still empty |
1011 | && !@{ $self->{_queue} } # and the queue is still empty |
653 | && $self->{on_read} # and we still want to read data |
1012 | && $self->{on_read} # but we still have on_read |
654 | ) { |
1013 | ) { |
|
|
1014 | # no further data will arrive |
655 | # then no progress can be made |
1015 | # so no progress can be made |
656 | return $self->_error (&Errno::EPIPE, 1); |
1016 | $self->_error (Errno::EPIPE, 1), return |
|
|
1017 | if $self->{_eof}; |
|
|
1018 | |
|
|
1019 | last; # more data might arrive |
657 | } |
1020 | } |
658 | } else { |
1021 | } else { |
659 | # read side becomes idle |
1022 | # read side becomes idle |
660 | delete $self->{_rw}; |
1023 | delete $self->{_rw} unless $self->{tls}; |
661 | return; |
1024 | last; |
662 | } |
1025 | } |
663 | } |
1026 | } |
664 | |
1027 | |
|
|
1028 | if ($self->{_eof}) { |
|
|
1029 | if ($self->{on_eof}) { |
665 | $self->{on_eof}($self) |
1030 | $self->{on_eof}($self) |
666 | if $self->{_eof} && $self->{on_eof}; |
1031 | } else { |
|
|
1032 | $self->_error (0, 1, "Unexpected end-of-file"); |
|
|
1033 | } |
|
|
1034 | } |
|
|
1035 | |
|
|
1036 | # may need to restart read watcher |
|
|
1037 | unless ($self->{_rw}) { |
|
|
1038 | $self->start_read |
|
|
1039 | if $self->{on_read} || @{ $self->{_queue} }; |
|
|
1040 | } |
667 | } |
1041 | } |
668 | |
1042 | |
669 | =item $handle->on_read ($cb) |
1043 | =item $handle->on_read ($cb) |
670 | |
1044 | |
671 | This replaces the currently set C<on_read> callback, or clears it (when |
1045 | This replaces the currently set C<on_read> callback, or clears it (when |
… | |
… | |
676 | |
1050 | |
677 | sub on_read { |
1051 | sub on_read { |
678 | my ($self, $cb) = @_; |
1052 | my ($self, $cb) = @_; |
679 | |
1053 | |
680 | $self->{on_read} = $cb; |
1054 | $self->{on_read} = $cb; |
|
|
1055 | $self->_drain_rbuf if $cb; |
681 | } |
1056 | } |
682 | |
1057 | |
683 | =item $handle->rbuf |
1058 | =item $handle->rbuf |
684 | |
1059 | |
685 | Returns the read buffer (as a modifiable lvalue). |
1060 | Returns the read buffer (as a modifiable lvalue). |
686 | |
1061 | |
687 | You can access the read buffer directly as the C<< ->{rbuf} >> member, if |
1062 | You can access the read buffer directly as the C<< ->{rbuf} >> |
688 | you want. |
1063 | member, if you want. However, the only operation allowed on the |
|
|
1064 | read buffer (apart from looking at it) is removing data from its |
|
|
1065 | beginning. Otherwise modifying or appending to it is not allowed and will |
|
|
1066 | lead to hard-to-track-down bugs. |
689 | |
1067 | |
690 | NOTE: The read buffer should only be used or modified if the C<on_read>, |
1068 | NOTE: The read buffer should only be used or modified if the C<on_read>, |
691 | C<push_read> or C<unshift_read> methods are used. The other read methods |
1069 | C<push_read> or C<unshift_read> methods are used. The other read methods |
692 | automatically manage the read buffer. |
1070 | automatically manage the read buffer. |
693 | |
1071 | |
… | |
… | |
790 | $cb->($_[0], substr $_[0]{rbuf}, 0, $len, ""); |
1168 | $cb->($_[0], substr $_[0]{rbuf}, 0, $len, ""); |
791 | 1 |
1169 | 1 |
792 | } |
1170 | } |
793 | }; |
1171 | }; |
794 | |
1172 | |
795 | # compatibility with older API |
|
|
796 | sub push_read_chunk { |
|
|
797 | $_[0]->push_read (chunk => $_[1], $_[2]); |
|
|
798 | } |
|
|
799 | |
|
|
800 | sub unshift_read_chunk { |
|
|
801 | $_[0]->unshift_read (chunk => $_[1], $_[2]); |
|
|
802 | } |
|
|
803 | |
|
|
804 | =item line => [$eol, ]$cb->($handle, $line, $eol) |
1173 | =item line => [$eol, ]$cb->($handle, $line, $eol) |
805 | |
1174 | |
806 | The callback will be called only once a full line (including the end of |
1175 | The callback will be called only once a full line (including the end of |
807 | line marker, C<$eol>) has been read. This line (excluding the end of line |
1176 | line marker, C<$eol>) has been read. This line (excluding the end of line |
808 | marker) will be passed to the callback as second argument (C<$line>), and |
1177 | marker) will be passed to the callback as second argument (C<$line>), and |
… | |
… | |
823 | =cut |
1192 | =cut |
824 | |
1193 | |
825 | register_read_type line => sub { |
1194 | register_read_type line => sub { |
826 | my ($self, $cb, $eol) = @_; |
1195 | my ($self, $cb, $eol) = @_; |
827 | |
1196 | |
828 | $eol = qr|(\015?\012)| if @_ < 3; |
1197 | if (@_ < 3) { |
829 | $eol = quotemeta $eol unless ref $eol; |
1198 | # this is more than twice as fast as the generic code below |
830 | $eol = qr|^(.*?)($eol)|s; |
|
|
831 | |
|
|
832 | sub { |
1199 | sub { |
833 | $_[0]{rbuf} =~ s/$eol// or return; |
1200 | $_[0]{rbuf} =~ s/^([^\015\012]*)(\015?\012)// or return; |
834 | |
1201 | |
835 | $cb->($_[0], $1, $2); |
1202 | $cb->($_[0], $1, $2); |
836 | 1 |
|
|
837 | } |
|
|
838 | }; |
|
|
839 | |
|
|
840 | # compatibility with older API |
|
|
841 | sub push_read_line { |
|
|
842 | my $self = shift; |
|
|
843 | $self->push_read (line => @_); |
|
|
844 | } |
|
|
845 | |
|
|
846 | sub unshift_read_line { |
|
|
847 | my $self = shift; |
|
|
848 | $self->unshift_read (line => @_); |
|
|
849 | } |
|
|
850 | |
|
|
851 | =item netstring => $cb->($handle, $string) |
|
|
852 | |
|
|
853 | A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement). |
|
|
854 | |
|
|
855 | Throws an error with C<$!> set to EBADMSG on format violations. |
|
|
856 | |
|
|
857 | =cut |
|
|
858 | |
|
|
859 | register_read_type netstring => sub { |
|
|
860 | my ($self, $cb) = @_; |
|
|
861 | |
|
|
862 | sub { |
|
|
863 | unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) { |
|
|
864 | if ($_[0]{rbuf} =~ /[^0-9]/) { |
|
|
865 | $self->_error (&Errno::EBADMSG); |
|
|
866 | } |
1203 | 1 |
867 | return; |
|
|
868 | } |
1204 | } |
|
|
1205 | } else { |
|
|
1206 | $eol = quotemeta $eol unless ref $eol; |
|
|
1207 | $eol = qr|^(.*?)($eol)|s; |
869 | |
1208 | |
870 | my $len = $1; |
1209 | sub { |
|
|
1210 | $_[0]{rbuf} =~ s/$eol// or return; |
871 | |
1211 | |
872 | $self->unshift_read (chunk => $len, sub { |
1212 | $cb->($_[0], $1, $2); |
873 | my $string = $_[1]; |
|
|
874 | $_[0]->unshift_read (chunk => 1, sub { |
|
|
875 | if ($_[1] eq ",") { |
|
|
876 | $cb->($_[0], $string); |
|
|
877 | } else { |
|
|
878 | $self->_error (&Errno::EBADMSG); |
|
|
879 | } |
|
|
880 | }); |
1213 | 1 |
881 | }); |
1214 | } |
882 | |
|
|
883 | 1 |
|
|
884 | } |
1215 | } |
885 | }; |
1216 | }; |
886 | |
1217 | |
887 | =item regex => $accept[, $reject[, $skip], $cb->($handle, $data) |
1218 | =item regex => $accept[, $reject[, $skip], $cb->($handle, $data) |
888 | |
1219 | |
… | |
… | |
940 | return 1; |
1271 | return 1; |
941 | } |
1272 | } |
942 | |
1273 | |
943 | # reject |
1274 | # reject |
944 | if ($reject && $$rbuf =~ $reject) { |
1275 | if ($reject && $$rbuf =~ $reject) { |
945 | $self->_error (&Errno::EBADMSG); |
1276 | $self->_error (Errno::EBADMSG); |
946 | } |
1277 | } |
947 | |
1278 | |
948 | # skip |
1279 | # skip |
949 | if ($skip && $$rbuf =~ $skip) { |
1280 | if ($skip && $$rbuf =~ $skip) { |
950 | $data .= substr $$rbuf, 0, $+[0], ""; |
1281 | $data .= substr $$rbuf, 0, $+[0], ""; |
… | |
… | |
952 | |
1283 | |
953 | () |
1284 | () |
954 | } |
1285 | } |
955 | }; |
1286 | }; |
956 | |
1287 | |
|
|
1288 | =item netstring => $cb->($handle, $string) |
|
|
1289 | |
|
|
1290 | A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement). |
|
|
1291 | |
|
|
1292 | Throws an error with C<$!> set to EBADMSG on format violations. |
|
|
1293 | |
|
|
1294 | =cut |
|
|
1295 | |
|
|
1296 | register_read_type netstring => sub { |
|
|
1297 | my ($self, $cb) = @_; |
|
|
1298 | |
|
|
1299 | sub { |
|
|
1300 | unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) { |
|
|
1301 | if ($_[0]{rbuf} =~ /[^0-9]/) { |
|
|
1302 | $self->_error (Errno::EBADMSG); |
|
|
1303 | } |
|
|
1304 | return; |
|
|
1305 | } |
|
|
1306 | |
|
|
1307 | my $len = $1; |
|
|
1308 | |
|
|
1309 | $self->unshift_read (chunk => $len, sub { |
|
|
1310 | my $string = $_[1]; |
|
|
1311 | $_[0]->unshift_read (chunk => 1, sub { |
|
|
1312 | if ($_[1] eq ",") { |
|
|
1313 | $cb->($_[0], $string); |
|
|
1314 | } else { |
|
|
1315 | $self->_error (Errno::EBADMSG); |
|
|
1316 | } |
|
|
1317 | }); |
|
|
1318 | }); |
|
|
1319 | |
|
|
1320 | 1 |
|
|
1321 | } |
|
|
1322 | }; |
|
|
1323 | |
|
|
1324 | =item packstring => $format, $cb->($handle, $string) |
|
|
1325 | |
|
|
1326 | An octet string prefixed with an encoded length. The encoding C<$format> |
|
|
1327 | uses the same format as a Perl C<pack> format, but must specify a single |
|
|
1328 | integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an |
|
|
1329 | optional C<!>, C<< < >> or C<< > >> modifier). |
|
|
1330 | |
|
|
1331 | For example, DNS over TCP uses a prefix of C<n> (2 octet network order), |
|
|
1332 | EPP uses a prefix of C<N> (4 octtes). |
|
|
1333 | |
|
|
1334 | Example: read a block of data prefixed by its length in BER-encoded |
|
|
1335 | format (very efficient). |
|
|
1336 | |
|
|
1337 | $handle->push_read (packstring => "w", sub { |
|
|
1338 | my ($handle, $data) = @_; |
|
|
1339 | }); |
|
|
1340 | |
|
|
1341 | =cut |
|
|
1342 | |
|
|
1343 | register_read_type packstring => sub { |
|
|
1344 | my ($self, $cb, $format) = @_; |
|
|
1345 | |
|
|
1346 | sub { |
|
|
1347 | # when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method |
|
|
1348 | defined (my $len = eval { unpack $format, $_[0]{rbuf} }) |
|
|
1349 | or return; |
|
|
1350 | |
|
|
1351 | $format = length pack $format, $len; |
|
|
1352 | |
|
|
1353 | # bypass unshift if we already have the remaining chunk |
|
|
1354 | if ($format + $len <= length $_[0]{rbuf}) { |
|
|
1355 | my $data = substr $_[0]{rbuf}, $format, $len; |
|
|
1356 | substr $_[0]{rbuf}, 0, $format + $len, ""; |
|
|
1357 | $cb->($_[0], $data); |
|
|
1358 | } else { |
|
|
1359 | # remove prefix |
|
|
1360 | substr $_[0]{rbuf}, 0, $format, ""; |
|
|
1361 | |
|
|
1362 | # read remaining chunk |
|
|
1363 | $_[0]->unshift_read (chunk => $len, $cb); |
|
|
1364 | } |
|
|
1365 | |
|
|
1366 | 1 |
|
|
1367 | } |
|
|
1368 | }; |
|
|
1369 | |
957 | =item json => $cb->($handle, $hash_or_arrayref) |
1370 | =item json => $cb->($handle, $hash_or_arrayref) |
958 | |
1371 | |
959 | Reads a JSON object or array, decodes it and passes it to the callback. |
1372 | Reads a JSON object or array, decodes it and passes it to the |
|
|
1373 | callback. When a parse error occurs, an C<EBADMSG> error will be raised. |
960 | |
1374 | |
961 | If a C<json> object was passed to the constructor, then that will be used |
1375 | If a C<json> object was passed to the constructor, then that will be used |
962 | for the final decode, otherwise it will create a JSON coder expecting UTF-8. |
1376 | for the final decode, otherwise it will create a JSON coder expecting UTF-8. |
963 | |
1377 | |
964 | This read type uses the incremental parser available with JSON version |
1378 | This read type uses the incremental parser available with JSON version |
… | |
… | |
971 | the C<json> write type description, above, for an actual example. |
1385 | the C<json> write type description, above, for an actual example. |
972 | |
1386 | |
973 | =cut |
1387 | =cut |
974 | |
1388 | |
975 | register_read_type json => sub { |
1389 | register_read_type json => sub { |
976 | my ($self, $cb, $accept, $reject, $skip) = @_; |
1390 | my ($self, $cb) = @_; |
977 | |
1391 | |
978 | require JSON; |
1392 | my $json = $self->{json} ||= |
|
|
1393 | eval { require JSON::XS; JSON::XS->new->utf8 } |
|
|
1394 | || do { require JSON; JSON->new->utf8 }; |
979 | |
1395 | |
980 | my $data; |
1396 | my $data; |
981 | my $rbuf = \$self->{rbuf}; |
1397 | my $rbuf = \$self->{rbuf}; |
982 | |
1398 | |
983 | my $json = $self->{json} ||= JSON->new->utf8; |
|
|
984 | |
|
|
985 | sub { |
1399 | sub { |
986 | my $ref = $json->incr_parse ($self->{rbuf}); |
1400 | my $ref = eval { $json->incr_parse ($self->{rbuf}) }; |
987 | |
1401 | |
988 | if ($ref) { |
1402 | if ($ref) { |
989 | $self->{rbuf} = $json->incr_text; |
1403 | $self->{rbuf} = $json->incr_text; |
990 | $json->incr_text = ""; |
1404 | $json->incr_text = ""; |
991 | $cb->($self, $ref); |
1405 | $cb->($self, $ref); |
992 | |
1406 | |
993 | 1 |
1407 | 1 |
|
|
1408 | } elsif ($@) { |
|
|
1409 | # error case |
|
|
1410 | $json->incr_skip; |
|
|
1411 | |
|
|
1412 | $self->{rbuf} = $json->incr_text; |
|
|
1413 | $json->incr_text = ""; |
|
|
1414 | |
|
|
1415 | $self->_error (Errno::EBADMSG); |
|
|
1416 | |
|
|
1417 | () |
994 | } else { |
1418 | } else { |
995 | $self->{rbuf} = ""; |
1419 | $self->{rbuf} = ""; |
|
|
1420 | |
996 | () |
1421 | () |
997 | } |
1422 | } |
|
|
1423 | } |
|
|
1424 | }; |
|
|
1425 | |
|
|
1426 | =item storable => $cb->($handle, $ref) |
|
|
1427 | |
|
|
1428 | Deserialises a L<Storable> frozen representation as written by the |
|
|
1429 | C<storable> write type (BER-encoded length prefix followed by nfreeze'd |
|
|
1430 | data). |
|
|
1431 | |
|
|
1432 | Raises C<EBADMSG> error if the data could not be decoded. |
|
|
1433 | |
|
|
1434 | =cut |
|
|
1435 | |
|
|
1436 | register_read_type storable => sub { |
|
|
1437 | my ($self, $cb) = @_; |
|
|
1438 | |
|
|
1439 | require Storable; |
|
|
1440 | |
|
|
1441 | sub { |
|
|
1442 | # when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method |
|
|
1443 | defined (my $len = eval { unpack "w", $_[0]{rbuf} }) |
|
|
1444 | or return; |
|
|
1445 | |
|
|
1446 | my $format = length pack "w", $len; |
|
|
1447 | |
|
|
1448 | # bypass unshift if we already have the remaining chunk |
|
|
1449 | if ($format + $len <= length $_[0]{rbuf}) { |
|
|
1450 | my $data = substr $_[0]{rbuf}, $format, $len; |
|
|
1451 | substr $_[0]{rbuf}, 0, $format + $len, ""; |
|
|
1452 | $cb->($_[0], Storable::thaw ($data)); |
|
|
1453 | } else { |
|
|
1454 | # remove prefix |
|
|
1455 | substr $_[0]{rbuf}, 0, $format, ""; |
|
|
1456 | |
|
|
1457 | # read remaining chunk |
|
|
1458 | $_[0]->unshift_read (chunk => $len, sub { |
|
|
1459 | if (my $ref = eval { Storable::thaw ($_[1]) }) { |
|
|
1460 | $cb->($_[0], $ref); |
|
|
1461 | } else { |
|
|
1462 | $self->_error (Errno::EBADMSG); |
|
|
1463 | } |
|
|
1464 | }); |
|
|
1465 | } |
|
|
1466 | |
|
|
1467 | 1 |
998 | } |
1468 | } |
999 | }; |
1469 | }; |
1000 | |
1470 | |
1001 | =back |
1471 | =back |
1002 | |
1472 | |
… | |
… | |
1023 | =item $handle->stop_read |
1493 | =item $handle->stop_read |
1024 | |
1494 | |
1025 | =item $handle->start_read |
1495 | =item $handle->start_read |
1026 | |
1496 | |
1027 | In rare cases you actually do not want to read anything from the |
1497 | In rare cases you actually do not want to read anything from the |
1028 | socket. In this case you can call C<stop_read>. Neither C<on_read> no |
1498 | socket. In this case you can call C<stop_read>. Neither C<on_read> nor |
1029 | any queued callbacks will be executed then. To start reading again, call |
1499 | any queued callbacks will be executed then. To start reading again, call |
1030 | C<start_read>. |
1500 | C<start_read>. |
1031 | |
1501 | |
|
|
1502 | Note that AnyEvent::Handle will automatically C<start_read> for you when |
|
|
1503 | you change the C<on_read> callback or push/unshift a read callback, and it |
|
|
1504 | will automatically C<stop_read> for you when neither C<on_read> is set nor |
|
|
1505 | there are any read requests in the queue. |
|
|
1506 | |
|
|
1507 | These methods will have no effect when in TLS mode (as TLS doesn't support |
|
|
1508 | half-duplex connections). |
|
|
1509 | |
1032 | =cut |
1510 | =cut |
1033 | |
1511 | |
1034 | sub stop_read { |
1512 | sub stop_read { |
1035 | my ($self) = @_; |
1513 | my ($self) = @_; |
1036 | |
1514 | |
1037 | delete $self->{_rw}; |
1515 | delete $self->{_rw} unless $self->{tls}; |
1038 | } |
1516 | } |
1039 | |
1517 | |
1040 | sub start_read { |
1518 | sub start_read { |
1041 | my ($self) = @_; |
1519 | my ($self) = @_; |
1042 | |
1520 | |
1043 | unless ($self->{_rw} || $self->{_eof}) { |
1521 | unless ($self->{_rw} || $self->{_eof}) { |
1044 | Scalar::Util::weaken $self; |
1522 | Scalar::Util::weaken $self; |
1045 | |
1523 | |
1046 | $self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub { |
1524 | $self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub { |
1047 | my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf}; |
1525 | my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf}); |
1048 | my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf; |
1526 | my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf; |
1049 | |
1527 | |
1050 | if ($len > 0) { |
1528 | if ($len > 0) { |
1051 | $self->{_activity} = AnyEvent->now; |
1529 | $self->{_activity} = AnyEvent->now; |
1052 | |
1530 | |
1053 | $self->{filter_r} |
1531 | if ($self->{tls}) { |
1054 | ? $self->{filter_r}($self, $rbuf) |
1532 | Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf); |
|
|
1533 | |
|
|
1534 | &_dotls ($self); |
|
|
1535 | } else { |
1055 | : $self->_drain_rbuf; |
1536 | $self->_drain_rbuf; |
|
|
1537 | } |
1056 | |
1538 | |
1057 | } elsif (defined $len) { |
1539 | } elsif (defined $len) { |
1058 | delete $self->{_rw}; |
1540 | delete $self->{_rw}; |
1059 | $self->{_eof} = 1; |
1541 | $self->{_eof} = 1; |
1060 | $self->_drain_rbuf; |
1542 | $self->_drain_rbuf; |
… | |
… | |
1064 | } |
1546 | } |
1065 | }); |
1547 | }); |
1066 | } |
1548 | } |
1067 | } |
1549 | } |
1068 | |
1550 | |
|
|
1551 | our $ERROR_SYSCALL; |
|
|
1552 | our $ERROR_WANT_READ; |
|
|
1553 | |
|
|
1554 | sub _tls_error { |
|
|
1555 | my ($self, $err) = @_; |
|
|
1556 | |
|
|
1557 | return $self->_error ($!, 1) |
|
|
1558 | if $err == Net::SSLeay::ERROR_SYSCALL (); |
|
|
1559 | |
|
|
1560 | my $err =Net::SSLeay::ERR_error_string (Net::SSLeay::ERR_get_error ()); |
|
|
1561 | |
|
|
1562 | # reduce error string to look less scary |
|
|
1563 | $err =~ s/^error:[0-9a-fA-F]{8}:[^:]+:([^:]+):/\L$1: /; |
|
|
1564 | |
|
|
1565 | if ($self->{_on_starttls}) { |
|
|
1566 | (delete $self->{_on_starttls})->($self, undef, $err); |
|
|
1567 | &_freetls; |
|
|
1568 | } else { |
|
|
1569 | &_freetls; |
|
|
1570 | $self->_error (Errno::EPROTO, 1, $err); |
|
|
1571 | } |
|
|
1572 | } |
|
|
1573 | |
|
|
1574 | # poll the write BIO and send the data if applicable |
|
|
1575 | # also decode read data if possible |
|
|
1576 | # this is basiclaly our TLS state machine |
|
|
1577 | # more efficient implementations are possible with openssl, |
|
|
1578 | # but not with the buggy and incomplete Net::SSLeay. |
1069 | sub _dotls { |
1579 | sub _dotls { |
1070 | my ($self) = @_; |
1580 | my ($self) = @_; |
1071 | |
1581 | |
|
|
1582 | my $tmp; |
|
|
1583 | |
1072 | if (length $self->{_tls_wbuf}) { |
1584 | if (length $self->{_tls_wbuf}) { |
1073 | while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) { |
1585 | while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) { |
1074 | substr $self->{_tls_wbuf}, 0, $len, ""; |
1586 | substr $self->{_tls_wbuf}, 0, $tmp, ""; |
1075 | } |
1587 | } |
1076 | } |
|
|
1077 | |
1588 | |
|
|
1589 | $tmp = Net::SSLeay::get_error ($self->{tls}, $tmp); |
|
|
1590 | return $self->_tls_error ($tmp) |
|
|
1591 | if $tmp != $ERROR_WANT_READ |
|
|
1592 | && ($tmp != $ERROR_SYSCALL || $!); |
|
|
1593 | } |
|
|
1594 | |
|
|
1595 | while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) { |
|
|
1596 | unless (length $tmp) { |
|
|
1597 | $self->{_on_starttls} |
|
|
1598 | and (delete $self->{_on_starttls})->($self, undef, "EOF during handshake"); # ??? |
|
|
1599 | &_freetls; |
|
|
1600 | |
|
|
1601 | if ($self->{on_stoptls}) { |
|
|
1602 | $self->{on_stoptls}($self); |
|
|
1603 | return; |
|
|
1604 | } else { |
|
|
1605 | # let's treat SSL-eof as we treat normal EOF |
|
|
1606 | delete $self->{_rw}; |
|
|
1607 | $self->{_eof} = 1; |
|
|
1608 | } |
|
|
1609 | } |
|
|
1610 | |
|
|
1611 | $self->{_tls_rbuf} .= $tmp; |
|
|
1612 | $self->_drain_rbuf; |
|
|
1613 | $self->{tls} or return; # tls session might have gone away in callback |
|
|
1614 | } |
|
|
1615 | |
|
|
1616 | $tmp = Net::SSLeay::get_error ($self->{tls}, -1); |
|
|
1617 | return $self->_tls_error ($tmp) |
|
|
1618 | if $tmp != $ERROR_WANT_READ |
|
|
1619 | && ($tmp != $ERROR_SYSCALL || $!); |
|
|
1620 | |
1078 | if (defined (my $buf = Net::SSLeay::BIO_read ($self->{_wbio}))) { |
1621 | while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) { |
1079 | $self->{wbuf} .= $buf; |
1622 | $self->{wbuf} .= $tmp; |
1080 | $self->_drain_wbuf; |
1623 | $self->_drain_wbuf; |
1081 | } |
1624 | } |
1082 | |
1625 | |
1083 | while (defined (my $buf = Net::SSLeay::read ($self->{tls}))) { |
1626 | $self->{_on_starttls} |
1084 | $self->{rbuf} .= $buf; |
1627 | and Net::SSLeay::state ($self->{tls}) == Net::SSLeay::ST_OK () |
1085 | $self->_drain_rbuf; |
1628 | and (delete $self->{_on_starttls})->($self, 1, "TLS/SSL connection established"); |
1086 | } |
|
|
1087 | |
|
|
1088 | my $err = Net::SSLeay::get_error ($self->{tls}, -1); |
|
|
1089 | |
|
|
1090 | if ($err!= Net::SSLeay::ERROR_WANT_READ ()) { |
|
|
1091 | if ($err == Net::SSLeay::ERROR_SYSCALL ()) { |
|
|
1092 | return $self->_error ($!, 1); |
|
|
1093 | } elsif ($err == Net::SSLeay::ERROR_SSL ()) { |
|
|
1094 | return $self->_error (&Errno::EIO, 1); |
|
|
1095 | } |
|
|
1096 | |
|
|
1097 | # all others are fine for our purposes |
|
|
1098 | } |
|
|
1099 | } |
1629 | } |
1100 | |
1630 | |
1101 | =item $handle->starttls ($tls[, $tls_ctx]) |
1631 | =item $handle->starttls ($tls[, $tls_ctx]) |
1102 | |
1632 | |
1103 | Instead of starting TLS negotiation immediately when the AnyEvent::Handle |
1633 | Instead of starting TLS negotiation immediately when the AnyEvent::Handle |
1104 | object is created, you can also do that at a later time by calling |
1634 | object is created, you can also do that at a later time by calling |
1105 | C<starttls>. |
1635 | C<starttls>. |
1106 | |
1636 | |
|
|
1637 | Starting TLS is currently an asynchronous operation - when you push some |
|
|
1638 | write data and then call C<< ->starttls >> then TLS negotiation will start |
|
|
1639 | immediately, after which the queued write data is then sent. |
|
|
1640 | |
1107 | The first argument is the same as the C<tls> constructor argument (either |
1641 | The first argument is the same as the C<tls> constructor argument (either |
1108 | C<"connect">, C<"accept"> or an existing Net::SSLeay object). |
1642 | C<"connect">, C<"accept"> or an existing Net::SSLeay object). |
1109 | |
1643 | |
1110 | The second argument is the optional C<Net::SSLeay::CTX> object that is |
1644 | The second argument is the optional C<AnyEvent::TLS> object that is used |
1111 | used when AnyEvent::Handle has to create its own TLS connection object. |
1645 | when AnyEvent::Handle has to create its own TLS connection object, or |
|
|
1646 | a hash reference with C<< key => value >> pairs that will be used to |
|
|
1647 | construct a new context. |
1112 | |
1648 | |
1113 | The TLS connection object will end up in C<< $handle->{tls} >> after this |
1649 | The TLS connection object will end up in C<< $handle->{tls} >>, the TLS |
1114 | call and can be used or changed to your liking. Note that the handshake |
1650 | context in C<< $handle->{tls_ctx} >> after this call and can be used or |
1115 | might have already started when this function returns. |
1651 | changed to your liking. Note that the handshake might have already started |
|
|
1652 | when this function returns. |
1116 | |
1653 | |
|
|
1654 | If it an error to start a TLS handshake more than once per |
|
|
1655 | AnyEvent::Handle object (this is due to bugs in OpenSSL). |
|
|
1656 | |
1117 | =cut |
1657 | =cut |
|
|
1658 | |
|
|
1659 | our %TLS_CACHE; #TODO not yet documented, should we? |
1118 | |
1660 | |
1119 | sub starttls { |
1661 | sub starttls { |
1120 | my ($self, $ssl, $ctx) = @_; |
1662 | my ($self, $ssl, $ctx) = @_; |
1121 | |
1663 | |
1122 | $self->stoptls; |
1664 | require Net::SSLeay; |
1123 | |
1665 | |
1124 | if ($ssl eq "accept") { |
1666 | Carp::croak "it is an error to call starttls more than once on an AnyEvent::Handle object" |
1125 | $ssl = Net::SSLeay::new ($ctx || TLS_CTX ()); |
1667 | if $self->{tls}; |
1126 | Net::SSLeay::set_accept_state ($ssl); |
1668 | |
1127 | } elsif ($ssl eq "connect") { |
1669 | $ERROR_SYSCALL = Net::SSLeay::ERROR_SYSCALL (); |
1128 | $ssl = Net::SSLeay::new ($ctx || TLS_CTX ()); |
1670 | $ERROR_WANT_READ = Net::SSLeay::ERROR_WANT_READ (); |
1129 | Net::SSLeay::set_connect_state ($ssl); |
1671 | |
|
|
1672 | $ctx ||= $self->{tls_ctx}; |
|
|
1673 | |
|
|
1674 | local $Carp::CarpLevel = 1; # skip ourselves when creating a new context or session |
|
|
1675 | |
|
|
1676 | if ("HASH" eq ref $ctx) { |
|
|
1677 | require AnyEvent::TLS; |
|
|
1678 | |
|
|
1679 | if ($ctx->{cache}) { |
|
|
1680 | my $key = $ctx+0; |
|
|
1681 | $ctx = $TLS_CACHE{$key} ||= new AnyEvent::TLS %$ctx; |
|
|
1682 | } else { |
|
|
1683 | $ctx = new AnyEvent::TLS %$ctx; |
|
|
1684 | } |
|
|
1685 | } |
1130 | } |
1686 | |
1131 | |
1687 | $self->{tls_ctx} = $ctx || TLS_CTX (); |
1132 | $self->{tls} = $ssl; |
1688 | $self->{tls} = $ssl = $self->{tls_ctx}->_get_session ($ssl, $self, $self->{peername}); |
1133 | |
1689 | |
1134 | # basically, this is deep magic (because SSL_read should have the same issues) |
1690 | # basically, this is deep magic (because SSL_read should have the same issues) |
1135 | # but the openssl maintainers basically said: "trust us, it just works". |
1691 | # but the openssl maintainers basically said: "trust us, it just works". |
1136 | # (unfortunately, we have to hardcode constants because the abysmally misdesigned |
1692 | # (unfortunately, we have to hardcode constants because the abysmally misdesigned |
1137 | # and mismaintained ssleay-module doesn't even offer them). |
1693 | # and mismaintained ssleay-module doesn't even offer them). |
1138 | # http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html |
1694 | # http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html |
|
|
1695 | # |
|
|
1696 | # in short: this is a mess. |
|
|
1697 | # |
|
|
1698 | # note that we do not try to keep the length constant between writes as we are required to do. |
|
|
1699 | # we assume that most (but not all) of this insanity only applies to non-blocking cases, |
|
|
1700 | # and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to |
|
|
1701 | # have identity issues in that area. |
1139 | Net::SSLeay::CTX_set_mode ($self->{tls}, |
1702 | # Net::SSLeay::CTX_set_mode ($ssl, |
1140 | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1) |
1703 | # (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1) |
1141 | | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2)); |
1704 | # | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2)); |
|
|
1705 | Net::SSLeay::CTX_set_mode ($ssl, 1|2); |
1142 | |
1706 | |
1143 | $self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
1707 | $self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
1144 | $self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
1708 | $self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
1145 | |
1709 | |
1146 | Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio}); |
1710 | Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio}); |
1147 | |
1711 | |
1148 | $self->{filter_w} = sub { |
1712 | $self->{_on_starttls} = sub { $_[0]{on_starttls}(@_) } |
1149 | $_[0]{_tls_wbuf} .= ${$_[1]}; |
1713 | if $self->{on_starttls}; |
1150 | &_dotls; |
1714 | |
1151 | }; |
1715 | &_dotls; # need to trigger the initial handshake |
1152 | $self->{filter_r} = sub { |
1716 | $self->start_read; # make sure we actually do read |
1153 | Net::SSLeay::BIO_write ($_[0]{_rbio}, ${$_[1]}); |
|
|
1154 | &_dotls; |
|
|
1155 | }; |
|
|
1156 | } |
1717 | } |
1157 | |
1718 | |
1158 | =item $handle->stoptls |
1719 | =item $handle->stoptls |
1159 | |
1720 | |
1160 | Destroys the SSL connection, if any. Partial read or write data will be |
1721 | Shuts down the SSL connection - this makes a proper EOF handshake by |
1161 | lost. |
1722 | sending a close notify to the other side, but since OpenSSL doesn't |
|
|
1723 | support non-blocking shut downs, it is not possible to re-use the stream |
|
|
1724 | afterwards. |
1162 | |
1725 | |
1163 | =cut |
1726 | =cut |
1164 | |
1727 | |
1165 | sub stoptls { |
1728 | sub stoptls { |
1166 | my ($self) = @_; |
1729 | my ($self) = @_; |
1167 | |
1730 | |
1168 | Net::SSLeay::free (delete $self->{tls}) if $self->{tls}; |
1731 | if ($self->{tls}) { |
|
|
1732 | Net::SSLeay::shutdown ($self->{tls}); |
1169 | |
1733 | |
1170 | delete $self->{_rbio}; |
1734 | &_dotls; |
1171 | delete $self->{_wbio}; |
1735 | |
1172 | delete $self->{_tls_wbuf}; |
1736 | # # we don't give a shit. no, we do, but we can't. no...#d# |
1173 | delete $self->{filter_r}; |
1737 | # # we, we... have to use openssl :/#d# |
1174 | delete $self->{filter_w}; |
1738 | # &_freetls;#d# |
|
|
1739 | } |
|
|
1740 | } |
|
|
1741 | |
|
|
1742 | sub _freetls { |
|
|
1743 | my ($self) = @_; |
|
|
1744 | |
|
|
1745 | return unless $self->{tls}; |
|
|
1746 | |
|
|
1747 | $self->{tls_ctx}->_put_session (delete $self->{tls}); |
|
|
1748 | |
|
|
1749 | delete @$self{qw(_rbio _wbio _tls_wbuf _on_starttls)}; |
1175 | } |
1750 | } |
1176 | |
1751 | |
1177 | sub DESTROY { |
1752 | sub DESTROY { |
1178 | my $self = shift; |
1753 | my ($self) = @_; |
1179 | |
1754 | |
1180 | $self->stoptls; |
1755 | &_freetls; |
|
|
1756 | |
|
|
1757 | my $linger = exists $self->{linger} ? $self->{linger} : 3600; |
|
|
1758 | |
|
|
1759 | if ($linger && length $self->{wbuf} && $self->{fh}) { |
|
|
1760 | my $fh = delete $self->{fh}; |
|
|
1761 | my $wbuf = delete $self->{wbuf}; |
|
|
1762 | |
|
|
1763 | my @linger; |
|
|
1764 | |
|
|
1765 | push @linger, AnyEvent->io (fh => $fh, poll => "w", cb => sub { |
|
|
1766 | my $len = syswrite $fh, $wbuf, length $wbuf; |
|
|
1767 | |
|
|
1768 | if ($len > 0) { |
|
|
1769 | substr $wbuf, 0, $len, ""; |
|
|
1770 | } else { |
|
|
1771 | @linger = (); # end |
|
|
1772 | } |
|
|
1773 | }); |
|
|
1774 | push @linger, AnyEvent->timer (after => $linger, cb => sub { |
|
|
1775 | @linger = (); |
|
|
1776 | }); |
|
|
1777 | } |
|
|
1778 | } |
|
|
1779 | |
|
|
1780 | =item $handle->destroy |
|
|
1781 | |
|
|
1782 | Shuts down the handle object as much as possible - this call ensures that |
|
|
1783 | no further callbacks will be invoked and as many resources as possible |
|
|
1784 | will be freed. You must not call any methods on the object afterwards. |
|
|
1785 | |
|
|
1786 | Normally, you can just "forget" any references to an AnyEvent::Handle |
|
|
1787 | object and it will simply shut down. This works in fatal error and EOF |
|
|
1788 | callbacks, as well as code outside. It does I<NOT> work in a read or write |
|
|
1789 | callback, so when you want to destroy the AnyEvent::Handle object from |
|
|
1790 | within such an callback. You I<MUST> call C<< ->destroy >> explicitly in |
|
|
1791 | that case. |
|
|
1792 | |
|
|
1793 | Destroying the handle object in this way has the advantage that callbacks |
|
|
1794 | will be removed as well, so if those are the only reference holders (as |
|
|
1795 | is common), then one doesn't need to do anything special to break any |
|
|
1796 | reference cycles. |
|
|
1797 | |
|
|
1798 | The handle might still linger in the background and write out remaining |
|
|
1799 | data, as specified by the C<linger> option, however. |
|
|
1800 | |
|
|
1801 | =cut |
|
|
1802 | |
|
|
1803 | sub destroy { |
|
|
1804 | my ($self) = @_; |
|
|
1805 | |
|
|
1806 | $self->DESTROY; |
|
|
1807 | %$self = (); |
1181 | } |
1808 | } |
1182 | |
1809 | |
1183 | =item AnyEvent::Handle::TLS_CTX |
1810 | =item AnyEvent::Handle::TLS_CTX |
1184 | |
1811 | |
1185 | This function creates and returns the Net::SSLeay::CTX object used by |
1812 | This function creates and returns the AnyEvent::TLS object used by default |
1186 | default for TLS mode. |
1813 | for TLS mode. |
1187 | |
1814 | |
1188 | The context is created like this: |
1815 | The context is created by calling L<AnyEvent::TLS> without any arguments. |
1189 | |
|
|
1190 | Net::SSLeay::load_error_strings; |
|
|
1191 | Net::SSLeay::SSLeay_add_ssl_algorithms; |
|
|
1192 | Net::SSLeay::randomize; |
|
|
1193 | |
|
|
1194 | my $CTX = Net::SSLeay::CTX_new; |
|
|
1195 | |
|
|
1196 | Net::SSLeay::CTX_set_options $CTX, Net::SSLeay::OP_ALL |
|
|
1197 | |
1816 | |
1198 | =cut |
1817 | =cut |
1199 | |
1818 | |
1200 | our $TLS_CTX; |
1819 | our $TLS_CTX; |
1201 | |
1820 | |
1202 | sub TLS_CTX() { |
1821 | sub TLS_CTX() { |
1203 | $TLS_CTX || do { |
1822 | $TLS_CTX ||= do { |
1204 | require Net::SSLeay; |
1823 | require AnyEvent::TLS; |
1205 | |
1824 | |
1206 | Net::SSLeay::load_error_strings (); |
1825 | new AnyEvent::TLS |
1207 | Net::SSLeay::SSLeay_add_ssl_algorithms (); |
|
|
1208 | Net::SSLeay::randomize (); |
|
|
1209 | |
|
|
1210 | $TLS_CTX = Net::SSLeay::CTX_new (); |
|
|
1211 | |
|
|
1212 | Net::SSLeay::CTX_set_options ($TLS_CTX, Net::SSLeay::OP_ALL ()); |
|
|
1213 | |
|
|
1214 | $TLS_CTX |
|
|
1215 | } |
1826 | } |
1216 | } |
1827 | } |
1217 | |
1828 | |
1218 | =back |
1829 | =back |
|
|
1830 | |
|
|
1831 | |
|
|
1832 | =head1 NONFREQUENTLY ASKED QUESTIONS |
|
|
1833 | |
|
|
1834 | =over 4 |
|
|
1835 | |
|
|
1836 | =item I C<undef> the AnyEvent::Handle reference inside my callback and |
|
|
1837 | still get further invocations! |
|
|
1838 | |
|
|
1839 | That's because AnyEvent::Handle keeps a reference to itself when handling |
|
|
1840 | read or write callbacks. |
|
|
1841 | |
|
|
1842 | It is only safe to "forget" the reference inside EOF or error callbacks, |
|
|
1843 | from within all other callbacks, you need to explicitly call the C<< |
|
|
1844 | ->destroy >> method. |
|
|
1845 | |
|
|
1846 | =item I get different callback invocations in TLS mode/Why can't I pause |
|
|
1847 | reading? |
|
|
1848 | |
|
|
1849 | Unlike, say, TCP, TLS connections do not consist of two independent |
|
|
1850 | communication channels, one for each direction. Or put differently. The |
|
|
1851 | read and write directions are not independent of each other: you cannot |
|
|
1852 | write data unless you are also prepared to read, and vice versa. |
|
|
1853 | |
|
|
1854 | This can mean than, in TLS mode, you might get C<on_error> or C<on_eof> |
|
|
1855 | callback invocations when you are not expecting any read data - the reason |
|
|
1856 | is that AnyEvent::Handle always reads in TLS mode. |
|
|
1857 | |
|
|
1858 | During the connection, you have to make sure that you always have a |
|
|
1859 | non-empty read-queue, or an C<on_read> watcher. At the end of the |
|
|
1860 | connection (or when you no longer want to use it) you can call the |
|
|
1861 | C<destroy> method. |
|
|
1862 | |
|
|
1863 | =item How do I read data until the other side closes the connection? |
|
|
1864 | |
|
|
1865 | If you just want to read your data into a perl scalar, the easiest way |
|
|
1866 | to achieve this is by setting an C<on_read> callback that does nothing, |
|
|
1867 | clearing the C<on_eof> callback and in the C<on_error> callback, the data |
|
|
1868 | will be in C<$_[0]{rbuf}>: |
|
|
1869 | |
|
|
1870 | $handle->on_read (sub { }); |
|
|
1871 | $handle->on_eof (undef); |
|
|
1872 | $handle->on_error (sub { |
|
|
1873 | my $data = delete $_[0]{rbuf}; |
|
|
1874 | }); |
|
|
1875 | |
|
|
1876 | The reason to use C<on_error> is that TCP connections, due to latencies |
|
|
1877 | and packets loss, might get closed quite violently with an error, when in |
|
|
1878 | fact, all data has been received. |
|
|
1879 | |
|
|
1880 | It is usually better to use acknowledgements when transferring data, |
|
|
1881 | to make sure the other side hasn't just died and you got the data |
|
|
1882 | intact. This is also one reason why so many internet protocols have an |
|
|
1883 | explicit QUIT command. |
|
|
1884 | |
|
|
1885 | =item I don't want to destroy the handle too early - how do I wait until |
|
|
1886 | all data has been written? |
|
|
1887 | |
|
|
1888 | After writing your last bits of data, set the C<on_drain> callback |
|
|
1889 | and destroy the handle in there - with the default setting of |
|
|
1890 | C<low_water_mark> this will be called precisely when all data has been |
|
|
1891 | written to the socket: |
|
|
1892 | |
|
|
1893 | $handle->push_write (...); |
|
|
1894 | $handle->on_drain (sub { |
|
|
1895 | warn "all data submitted to the kernel\n"; |
|
|
1896 | undef $handle; |
|
|
1897 | }); |
|
|
1898 | |
|
|
1899 | If you just want to queue some data and then signal EOF to the other side, |
|
|
1900 | consider using C<< ->push_shutdown >> instead. |
|
|
1901 | |
|
|
1902 | =item I want to contact a TLS/SSL server, I don't care about security. |
|
|
1903 | |
|
|
1904 | If your TLS server is a pure TLS server (e.g. HTTPS) that only speaks TLS, |
|
|
1905 | simply connect to it and then create the AnyEvent::Handle with the C<tls> |
|
|
1906 | parameter: |
|
|
1907 | |
|
|
1908 | tcp_connect $host, $port, sub { |
|
|
1909 | my ($fh) = @_; |
|
|
1910 | |
|
|
1911 | my $handle = new AnyEvent::Handle |
|
|
1912 | fh => $fh, |
|
|
1913 | tls => "connect", |
|
|
1914 | on_error => sub { ... }; |
|
|
1915 | |
|
|
1916 | $handle->push_write (...); |
|
|
1917 | }; |
|
|
1918 | |
|
|
1919 | =item I want to contact a TLS/SSL server, I do care about security. |
|
|
1920 | |
|
|
1921 | Then you should additionally enable certificate verification, including |
|
|
1922 | peername verification, if the protocol you use supports it (see |
|
|
1923 | L<AnyEvent::TLS>, C<verify_peername>). |
|
|
1924 | |
|
|
1925 | E.g. for HTTPS: |
|
|
1926 | |
|
|
1927 | tcp_connect $host, $port, sub { |
|
|
1928 | my ($fh) = @_; |
|
|
1929 | |
|
|
1930 | my $handle = new AnyEvent::Handle |
|
|
1931 | fh => $fh, |
|
|
1932 | peername => $host, |
|
|
1933 | tls => "connect", |
|
|
1934 | tls_ctx => { verify => 1, verify_peername => "https" }, |
|
|
1935 | ... |
|
|
1936 | |
|
|
1937 | Note that you must specify the hostname you connected to (or whatever |
|
|
1938 | "peername" the protocol needs) as the C<peername> argument, otherwise no |
|
|
1939 | peername verification will be done. |
|
|
1940 | |
|
|
1941 | The above will use the system-dependent default set of trusted CA |
|
|
1942 | certificates. If you want to check against a specific CA, add the |
|
|
1943 | C<ca_file> (or C<ca_cert>) arguments to C<tls_ctx>: |
|
|
1944 | |
|
|
1945 | tls_ctx => { |
|
|
1946 | verify => 1, |
|
|
1947 | verify_peername => "https", |
|
|
1948 | ca_file => "my-ca-cert.pem", |
|
|
1949 | }, |
|
|
1950 | |
|
|
1951 | =item I want to create a TLS/SSL server, how do I do that? |
|
|
1952 | |
|
|
1953 | Well, you first need to get a server certificate and key. You have |
|
|
1954 | three options: a) ask a CA (buy one, use cacert.org etc.) b) create a |
|
|
1955 | self-signed certificate (cheap. check the search engine of your choice, |
|
|
1956 | there are many tutorials on the net) or c) make your own CA (tinyca2 is a |
|
|
1957 | nice program for that purpose). |
|
|
1958 | |
|
|
1959 | Then create a file with your private key (in PEM format, see |
|
|
1960 | L<AnyEvent::TLS>), followed by the certificate (also in PEM format). The |
|
|
1961 | file should then look like this: |
|
|
1962 | |
|
|
1963 | -----BEGIN RSA PRIVATE KEY----- |
|
|
1964 | ...header data |
|
|
1965 | ... lots of base64'y-stuff |
|
|
1966 | -----END RSA PRIVATE KEY----- |
|
|
1967 | |
|
|
1968 | -----BEGIN CERTIFICATE----- |
|
|
1969 | ... lots of base64'y-stuff |
|
|
1970 | -----END CERTIFICATE----- |
|
|
1971 | |
|
|
1972 | The important bits are the "PRIVATE KEY" and "CERTIFICATE" parts. Then |
|
|
1973 | specify this file as C<cert_file>: |
|
|
1974 | |
|
|
1975 | tcp_server undef, $port, sub { |
|
|
1976 | my ($fh) = @_; |
|
|
1977 | |
|
|
1978 | my $handle = new AnyEvent::Handle |
|
|
1979 | fh => $fh, |
|
|
1980 | tls => "accept", |
|
|
1981 | tls_ctx => { cert_file => "my-server-keycert.pem" }, |
|
|
1982 | ... |
|
|
1983 | |
|
|
1984 | When you have intermediate CA certificates that your clients might not |
|
|
1985 | know about, just append them to the C<cert_file>. |
|
|
1986 | |
|
|
1987 | =back |
|
|
1988 | |
1219 | |
1989 | |
1220 | =head1 SUBCLASSING AnyEvent::Handle |
1990 | =head1 SUBCLASSING AnyEvent::Handle |
1221 | |
1991 | |
1222 | In many cases, you might want to subclass AnyEvent::Handle. |
1992 | In many cases, you might want to subclass AnyEvent::Handle. |
1223 | |
1993 | |
… | |
… | |
1227 | =over 4 |
1997 | =over 4 |
1228 | |
1998 | |
1229 | =item * all constructor arguments become object members. |
1999 | =item * all constructor arguments become object members. |
1230 | |
2000 | |
1231 | At least initially, when you pass a C<tls>-argument to the constructor it |
2001 | At least initially, when you pass a C<tls>-argument to the constructor it |
1232 | will end up in C<< $handle->{tls} >>. Those members might be changes or |
2002 | will end up in C<< $handle->{tls} >>. Those members might be changed or |
1233 | mutated later on (for example C<tls> will hold the TLS connection object). |
2003 | mutated later on (for example C<tls> will hold the TLS connection object). |
1234 | |
2004 | |
1235 | =item * other object member names are prefixed with an C<_>. |
2005 | =item * other object member names are prefixed with an C<_>. |
1236 | |
2006 | |
1237 | All object members not explicitly documented (internal use) are prefixed |
2007 | All object members not explicitly documented (internal use) are prefixed |