… | |
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2 | |
2 | |
3 | no warnings; |
3 | no warnings; |
4 | use strict; |
4 | use strict; |
5 | |
5 | |
6 | use AnyEvent (); |
6 | use AnyEvent (); |
7 | use AnyEvent::Util (); |
7 | use AnyEvent::Util qw(WSAEWOULDBLOCK); |
8 | use Scalar::Util (); |
8 | use Scalar::Util (); |
9 | use Carp (); |
9 | use Carp (); |
10 | use Fcntl (); |
10 | use Fcntl (); |
11 | use Errno qw/EAGAIN EINTR/; |
11 | use Errno qw(EAGAIN EINTR); |
12 | |
12 | |
13 | =head1 NAME |
13 | =head1 NAME |
14 | |
14 | |
15 | AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent |
15 | AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent |
16 | |
16 | |
17 | This module is experimental. |
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18 | |
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19 | =cut |
17 | =cut |
20 | |
18 | |
21 | our $VERSION = '0.04'; |
19 | our $VERSION = 4.1; |
22 | |
20 | |
23 | =head1 SYNOPSIS |
21 | =head1 SYNOPSIS |
24 | |
22 | |
25 | use AnyEvent; |
23 | use AnyEvent; |
26 | use AnyEvent::Handle; |
24 | use AnyEvent::Handle; |
27 | |
25 | |
28 | my $cv = AnyEvent->condvar; |
26 | my $cv = AnyEvent->condvar; |
29 | |
27 | |
30 | my $ae_fh = AnyEvent::Handle->new (fh => \*STDIN); |
28 | my $handle = |
31 | |
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32 | #TODO |
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33 | |
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34 | # or use the constructor to pass the callback: |
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35 | |
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36 | my $ae_fh2 = |
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37 | AnyEvent::Handle->new ( |
29 | AnyEvent::Handle->new ( |
38 | fh => \*STDIN, |
30 | fh => \*STDIN, |
39 | on_eof => sub { |
31 | on_eof => sub { |
40 | $cv->broadcast; |
32 | $cv->broadcast; |
41 | }, |
33 | }, |
42 | #TODO |
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43 | ); |
34 | ); |
44 | |
35 | |
45 | $cv->wait; |
36 | # send some request line |
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37 | $handle->push_write ("getinfo\015\012"); |
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38 | |
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39 | # read the response line |
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40 | $handle->push_read (line => sub { |
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41 | my ($handle, $line) = @_; |
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42 | warn "read line <$line>\n"; |
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43 | $cv->send; |
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44 | }); |
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45 | |
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46 | $cv->recv; |
46 | |
47 | |
47 | =head1 DESCRIPTION |
48 | =head1 DESCRIPTION |
48 | |
49 | |
49 | This module is a helper module to make it easier to do event-based I/O on |
50 | This module is a helper module to make it easier to do event-based I/O on |
50 | filehandles. For utility functions for doing non-blocking connects and accepts |
51 | filehandles. For utility functions for doing non-blocking connects and accepts |
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… | |
72 | The filehandle this L<AnyEvent::Handle> object will operate on. |
73 | The filehandle this L<AnyEvent::Handle> object will operate on. |
73 | |
74 | |
74 | NOTE: The filehandle will be set to non-blocking (using |
75 | NOTE: The filehandle will be set to non-blocking (using |
75 | AnyEvent::Util::fh_nonblocking). |
76 | AnyEvent::Util::fh_nonblocking). |
76 | |
77 | |
77 | =item on_eof => $cb->($self) |
78 | =item on_eof => $cb->($handle) |
78 | |
79 | |
79 | Set the callback to be called on EOF. |
80 | Set the callback to be called on EOF. |
80 | |
81 | |
81 | While not mandatory, it is highly recommended to set an eof callback, |
82 | While not mandatory, it is highly recommended to set an eof callback, |
82 | otherwise you might end up with a closed socket while you are still |
83 | otherwise you might end up with a closed socket while you are still |
83 | waiting for data. |
84 | waiting for data. |
84 | |
85 | |
85 | =item on_error => $cb->($self) |
86 | =item on_error => $cb->($handle) |
86 | |
87 | |
87 | This is the fatal error callback, that is called when, well, a fatal error |
88 | This is the fatal error callback, that is called when, well, a fatal error |
88 | occurs, such as not being able to resolve the hostname, failure to connect |
89 | occurs, such as not being able to resolve the hostname, failure to connect |
89 | or a read error. |
90 | or a read error. |
90 | |
91 | |
91 | The object will not be in a usable state when this callback has been |
92 | The object will not be in a usable state when this callback has been |
92 | called. |
93 | called. |
93 | |
94 | |
94 | On callback entrance, the value of C<$!> contains the operating system |
95 | On callback entrance, the value of C<$!> contains the operating system |
95 | error (or C<ENOSPC>, C<EPIPE> or C<EBADMSG>). |
96 | error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>). |
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97 | |
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98 | The callback should throw an exception. If it returns, then |
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99 | AnyEvent::Handle will C<croak> for you. |
96 | |
100 | |
97 | While not mandatory, it is I<highly> recommended to set this callback, as |
101 | While not mandatory, it is I<highly> recommended to set this callback, as |
98 | you will not be notified of errors otherwise. The default simply calls |
102 | you will not be notified of errors otherwise. The default simply calls |
99 | die. |
103 | die. |
100 | |
104 | |
101 | =item on_read => $cb->($self) |
105 | =item on_read => $cb->($handle) |
102 | |
106 | |
103 | This sets the default read callback, which is called when data arrives |
107 | This sets the default read callback, which is called when data arrives |
104 | and no read request is in the queue. |
108 | and no read request is in the queue. |
105 | |
109 | |
106 | To access (and remove data from) the read buffer, use the C<< ->rbuf >> |
110 | To access (and remove data from) the read buffer, use the C<< ->rbuf >> |
107 | method or access the C<$self->{rbuf}> member directly. |
111 | method or access the C<$handle->{rbuf}> member directly. |
108 | |
112 | |
109 | When an EOF condition is detected then AnyEvent::Handle will first try to |
113 | When an EOF condition is detected then AnyEvent::Handle will first try to |
110 | feed all the remaining data to the queued callbacks and C<on_read> before |
114 | feed all the remaining data to the queued callbacks and C<on_read> before |
111 | calling the C<on_eof> callback. If no progress can be made, then a fatal |
115 | calling the C<on_eof> callback. If no progress can be made, then a fatal |
112 | error will be raised (with C<$!> set to C<EPIPE>). |
116 | error will be raised (with C<$!> set to C<EPIPE>). |
113 | |
117 | |
114 | =item on_drain => $cb->() |
118 | =item on_drain => $cb->($handle) |
115 | |
119 | |
116 | This sets the callback that is called when the write buffer becomes empty |
120 | This sets the callback that is called when the write buffer becomes empty |
117 | (or when the callback is set and the buffer is empty already). |
121 | (or when the callback is set and the buffer is empty already). |
118 | |
122 | |
119 | To append to the write buffer, use the C<< ->push_write >> method. |
123 | To append to the write buffer, use the C<< ->push_write >> method. |
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124 | |
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125 | =item timeout => $fractional_seconds |
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126 | |
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127 | If non-zero, then this enables an "inactivity" timeout: whenever this many |
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128 | seconds pass without a successful read or write on the underlying file |
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129 | handle, the C<on_timeout> callback will be invoked (and if that one is |
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130 | missing, an C<ETIMEDOUT> error will be raised). |
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131 | |
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132 | Note that timeout processing is also active when you currently do not have |
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133 | any outstanding read or write requests: If you plan to keep the connection |
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134 | idle then you should disable the timout temporarily or ignore the timeout |
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135 | in the C<on_timeout> callback. |
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136 | |
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137 | Zero (the default) disables this timeout. |
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138 | |
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139 | =item on_timeout => $cb->($handle) |
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140 | |
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141 | Called whenever the inactivity timeout passes. If you return from this |
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142 | callback, then the timeout will be reset as if some activity had happened, |
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143 | so this condition is not fatal in any way. |
120 | |
144 | |
121 | =item rbuf_max => <bytes> |
145 | =item rbuf_max => <bytes> |
122 | |
146 | |
123 | If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>) |
147 | If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>) |
124 | when the read buffer ever (strictly) exceeds this size. This is useful to |
148 | when the read buffer ever (strictly) exceeds this size. This is useful to |
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… | |
131 | isn't finished). |
155 | isn't finished). |
132 | |
156 | |
133 | =item read_size => <bytes> |
157 | =item read_size => <bytes> |
134 | |
158 | |
135 | The default read block size (the amount of bytes this module will try to read |
159 | The default read block size (the amount of bytes this module will try to read |
136 | on each [loop iteration). Default: C<4096>. |
160 | during each (loop iteration). Default: C<8192>. |
137 | |
161 | |
138 | =item low_water_mark => <bytes> |
162 | =item low_water_mark => <bytes> |
139 | |
163 | |
140 | Sets the amount of bytes (default: C<0>) that make up an "empty" write |
164 | Sets the amount of bytes (default: C<0>) that make up an "empty" write |
141 | buffer: If the write reaches this size or gets even samller it is |
165 | buffer: If the write reaches this size or gets even samller it is |
… | |
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164 | |
188 | |
165 | Use the given Net::SSLeay::CTX object to create the new TLS connection |
189 | Use the given Net::SSLeay::CTX object to create the new TLS connection |
166 | (unless a connection object was specified directly). If this parameter is |
190 | (unless a connection object was specified directly). If this parameter is |
167 | missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>. |
191 | missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>. |
168 | |
192 | |
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193 | =item json => JSON or JSON::XS object |
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194 | |
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195 | This is the json coder object used by the C<json> read and write types. |
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196 | |
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197 | If you don't supply it, then AnyEvent::Handle will create and use a |
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198 | suitable one, which will write and expect UTF-8 encoded JSON texts. |
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199 | |
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200 | Note that you are responsible to depend on the JSON module if you want to |
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201 | use this functionality, as AnyEvent does not have a dependency itself. |
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202 | |
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203 | =item filter_r => $cb |
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204 | |
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205 | =item filter_w => $cb |
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206 | |
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207 | These exist, but are undocumented at this time. |
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208 | |
169 | =back |
209 | =back |
170 | |
210 | |
171 | =cut |
211 | =cut |
172 | |
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173 | our (%RH, %WH); |
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174 | |
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175 | sub register_read_type($$) { |
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176 | $RH{$_[0]} = $_[1]; |
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177 | } |
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178 | |
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179 | sub register_write_type($$) { |
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180 | $WH{$_[0]} = $_[1]; |
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181 | } |
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182 | |
212 | |
183 | sub new { |
213 | sub new { |
184 | my $class = shift; |
214 | my $class = shift; |
185 | |
215 | |
186 | my $self = bless { @_ }, $class; |
216 | my $self = bless { @_ }, $class; |
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192 | if ($self->{tls}) { |
222 | if ($self->{tls}) { |
193 | require Net::SSLeay; |
223 | require Net::SSLeay; |
194 | $self->starttls (delete $self->{tls}, delete $self->{tls_ctx}); |
224 | $self->starttls (delete $self->{tls}, delete $self->{tls_ctx}); |
195 | } |
225 | } |
196 | |
226 | |
197 | $self->on_eof (delete $self->{on_eof} ) if $self->{on_eof}; |
227 | # $self->on_eof (delete $self->{on_eof} ) if $self->{on_eof}; # nop |
198 | $self->on_error (delete $self->{on_error}) if $self->{on_error}; |
228 | # $self->on_error (delete $self->{on_error}) if $self->{on_error}; # nop |
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229 | # $self->on_read (delete $self->{on_read} ) if $self->{on_read}; # nop |
199 | $self->on_drain (delete $self->{on_drain}) if $self->{on_drain}; |
230 | $self->on_drain (delete $self->{on_drain}) if $self->{on_drain}; |
200 | $self->on_read (delete $self->{on_read} ) if $self->{on_read}; |
231 | |
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232 | $self->{_activity} = AnyEvent->now; |
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233 | $self->_timeout; |
201 | |
234 | |
202 | $self->start_read; |
235 | $self->start_read; |
203 | |
236 | |
204 | $self |
237 | $self |
205 | } |
238 | } |
206 | |
239 | |
207 | sub _shutdown { |
240 | sub _shutdown { |
208 | my ($self) = @_; |
241 | my ($self) = @_; |
209 | |
242 | |
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243 | delete $self->{_tw}; |
210 | delete $self->{rw}; |
244 | delete $self->{_rw}; |
211 | delete $self->{ww}; |
245 | delete $self->{_ww}; |
212 | delete $self->{fh}; |
246 | delete $self->{fh}; |
213 | } |
247 | } |
214 | |
248 | |
215 | sub error { |
249 | sub error { |
216 | my ($self) = @_; |
250 | my ($self) = @_; |
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… | |
218 | { |
252 | { |
219 | local $!; |
253 | local $!; |
220 | $self->_shutdown; |
254 | $self->_shutdown; |
221 | } |
255 | } |
222 | |
256 | |
223 | if ($self->{on_error}) { |
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224 | $self->{on_error}($self); |
257 | $self->{on_error}($self) |
225 | } else { |
258 | if $self->{on_error}; |
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259 | |
226 | Carp::croak "AnyEvent::Handle uncaught fatal error: $!"; |
260 | Carp::croak "AnyEvent::Handle uncaught fatal error: $!"; |
227 | } |
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228 | } |
261 | } |
229 | |
262 | |
230 | =item $fh = $handle->fh |
263 | =item $fh = $handle->fh |
231 | |
264 | |
232 | This method returns the file handle of the L<AnyEvent::Handle> object. |
265 | This method returns the file handle of the L<AnyEvent::Handle> object. |
233 | |
266 | |
234 | =cut |
267 | =cut |
235 | |
268 | |
236 | sub fh { $_[0]->{fh} } |
269 | sub fh { $_[0]{fh} } |
237 | |
270 | |
238 | =item $handle->on_error ($cb) |
271 | =item $handle->on_error ($cb) |
239 | |
272 | |
240 | Replace the current C<on_error> callback (see the C<on_error> constructor argument). |
273 | Replace the current C<on_error> callback (see the C<on_error> constructor argument). |
241 | |
274 | |
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251 | |
284 | |
252 | =cut |
285 | =cut |
253 | |
286 | |
254 | sub on_eof { |
287 | sub on_eof { |
255 | $_[0]{on_eof} = $_[1]; |
288 | $_[0]{on_eof} = $_[1]; |
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289 | } |
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290 | |
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291 | =item $handle->on_timeout ($cb) |
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292 | |
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293 | Replace the current C<on_timeout> callback, or disables the callback |
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294 | (but not the timeout) if C<$cb> = C<undef>. See C<timeout> constructor |
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295 | argument. |
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296 | |
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297 | =cut |
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298 | |
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299 | sub on_timeout { |
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300 | $_[0]{on_timeout} = $_[1]; |
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301 | } |
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302 | |
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303 | ############################################################################# |
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304 | |
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305 | =item $handle->timeout ($seconds) |
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306 | |
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307 | Configures (or disables) the inactivity timeout. |
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308 | |
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309 | =cut |
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310 | |
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311 | sub timeout { |
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312 | my ($self, $timeout) = @_; |
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313 | |
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314 | $self->{timeout} = $timeout; |
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315 | $self->_timeout; |
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316 | } |
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317 | |
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318 | # reset the timeout watcher, as neccessary |
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319 | # also check for time-outs |
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320 | sub _timeout { |
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321 | my ($self) = @_; |
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322 | |
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323 | if ($self->{timeout}) { |
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324 | my $NOW = AnyEvent->now; |
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325 | |
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326 | # when would the timeout trigger? |
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327 | my $after = $self->{_activity} + $self->{timeout} - $NOW; |
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328 | |
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329 | # now or in the past already? |
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330 | if ($after <= 0) { |
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331 | $self->{_activity} = $NOW; |
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332 | |
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333 | if ($self->{on_timeout}) { |
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334 | $self->{on_timeout}($self); |
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335 | } else { |
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336 | $! = Errno::ETIMEDOUT; |
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337 | $self->error; |
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338 | } |
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339 | |
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340 | # callbakx could have changed timeout value, optimise |
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341 | return unless $self->{timeout}; |
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342 | |
|
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343 | # calculate new after |
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344 | $after = $self->{timeout}; |
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345 | } |
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346 | |
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347 | Scalar::Util::weaken $self; |
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348 | |
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349 | $self->{_tw} ||= AnyEvent->timer (after => $after, cb => sub { |
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350 | delete $self->{_tw}; |
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351 | $self->_timeout; |
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352 | }); |
|
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353 | } else { |
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354 | delete $self->{_tw}; |
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355 | } |
256 | } |
356 | } |
257 | |
357 | |
258 | ############################################################################# |
358 | ############################################################################# |
259 | |
359 | |
260 | =back |
360 | =back |
… | |
… | |
297 | =cut |
397 | =cut |
298 | |
398 | |
299 | sub _drain_wbuf { |
399 | sub _drain_wbuf { |
300 | my ($self) = @_; |
400 | my ($self) = @_; |
301 | |
401 | |
302 | if (!$self->{ww} && length $self->{wbuf}) { |
402 | if (!$self->{_ww} && length $self->{wbuf}) { |
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403 | |
303 | Scalar::Util::weaken $self; |
404 | Scalar::Util::weaken $self; |
|
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405 | |
304 | my $cb = sub { |
406 | my $cb = sub { |
305 | my $len = syswrite $self->{fh}, $self->{wbuf}; |
407 | my $len = syswrite $self->{fh}, $self->{wbuf}; |
306 | |
408 | |
307 | if ($len >= 0) { |
409 | if ($len >= 0) { |
308 | substr $self->{wbuf}, 0, $len, ""; |
410 | substr $self->{wbuf}, 0, $len, ""; |
|
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411 | |
|
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412 | $self->{_activity} = AnyEvent->now; |
309 | |
413 | |
310 | $self->{on_drain}($self) |
414 | $self->{on_drain}($self) |
311 | if $self->{low_water_mark} >= length $self->{wbuf} |
415 | if $self->{low_water_mark} >= length $self->{wbuf} |
312 | && $self->{on_drain}; |
416 | && $self->{on_drain}; |
313 | |
417 | |
314 | delete $self->{ww} unless length $self->{wbuf}; |
418 | delete $self->{_ww} unless length $self->{wbuf}; |
315 | } elsif ($! != EAGAIN && $! != EINTR) { |
419 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) { |
316 | $self->error; |
420 | $self->error; |
317 | } |
421 | } |
318 | }; |
422 | }; |
319 | |
423 | |
|
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424 | # try to write data immediately |
|
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425 | $cb->(); |
|
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426 | |
|
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427 | # if still data left in wbuf, we need to poll |
320 | $self->{ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb); |
428 | $self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb) |
321 | |
429 | if length $self->{wbuf}; |
322 | $cb->($self); |
|
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323 | }; |
430 | }; |
|
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431 | } |
|
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432 | |
|
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433 | our %WH; |
|
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434 | |
|
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435 | sub register_write_type($$) { |
|
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436 | $WH{$_[0]} = $_[1]; |
324 | } |
437 | } |
325 | |
438 | |
326 | sub push_write { |
439 | sub push_write { |
327 | my $self = shift; |
440 | my $self = shift; |
328 | |
441 | |
… | |
… | |
332 | @_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write") |
445 | @_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write") |
333 | ->($self, @_); |
446 | ->($self, @_); |
334 | } |
447 | } |
335 | |
448 | |
336 | if ($self->{filter_w}) { |
449 | if ($self->{filter_w}) { |
337 | $self->{filter_w}->($self, \$_[0]); |
450 | $self->{filter_w}($self, \$_[0]); |
338 | } else { |
451 | } else { |
339 | $self->{wbuf} .= $_[0]; |
452 | $self->{wbuf} .= $_[0]; |
340 | $self->_drain_wbuf; |
453 | $self->_drain_wbuf; |
341 | } |
454 | } |
342 | } |
455 | } |
… | |
… | |
346 | =item $handle->unshift_write (type => @args) |
459 | =item $handle->unshift_write (type => @args) |
347 | |
460 | |
348 | Instead of formatting your data yourself, you can also let this module do |
461 | Instead of formatting your data yourself, you can also let this module do |
349 | the job by specifying a type and type-specific arguments. |
462 | the job by specifying a type and type-specific arguments. |
350 | |
463 | |
351 | Predefined types are: |
464 | Predefined types are (if you have ideas for additional types, feel free to |
|
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465 | drop by and tell us): |
352 | |
466 | |
353 | =over 4 |
467 | =over 4 |
354 | |
468 | |
355 | =item netstring => $string |
469 | =item netstring => $string |
356 | |
470 | |
357 | Formats the given value as netstring |
471 | Formats the given value as netstring |
358 | (http://cr.yp.to/proto/netstrings.txt, this is not a recommendation to use them). |
472 | (http://cr.yp.to/proto/netstrings.txt, this is not a recommendation to use them). |
359 | |
473 | |
|
|
474 | =back |
|
|
475 | |
360 | =cut |
476 | =cut |
361 | |
477 | |
362 | register_write_type netstring => sub { |
478 | register_write_type netstring => sub { |
363 | my ($self, $string) = @_; |
479 | my ($self, $string) = @_; |
364 | |
480 | |
365 | sprintf "%d:%s,", (length $string), $string |
481 | sprintf "%d:%s,", (length $string), $string |
366 | }; |
482 | }; |
367 | |
483 | |
368 | =back |
484 | =item json => $array_or_hashref |
369 | |
485 | |
370 | =cut |
486 | Encodes the given hash or array reference into a JSON object. Unless you |
|
|
487 | provide your own JSON object, this means it will be encoded to JSON text |
|
|
488 | in UTF-8. |
371 | |
489 | |
|
|
490 | JSON objects (and arrays) are self-delimiting, so you can write JSON at |
|
|
491 | one end of a handle and read them at the other end without using any |
|
|
492 | additional framing. |
372 | |
493 | |
|
|
494 | The generated JSON text is guaranteed not to contain any newlines: While |
|
|
495 | this module doesn't need delimiters after or between JSON texts to be |
|
|
496 | able to read them, many other languages depend on that. |
|
|
497 | |
|
|
498 | A simple RPC protocol that interoperates easily with others is to send |
|
|
499 | JSON arrays (or objects, although arrays are usually the better choice as |
|
|
500 | they mimic how function argument passing works) and a newline after each |
|
|
501 | JSON text: |
|
|
502 | |
|
|
503 | $handle->push_write (json => ["method", "arg1", "arg2"]); # whatever |
|
|
504 | $handle->push_write ("\012"); |
|
|
505 | |
|
|
506 | An AnyEvent::Handle receiver would simply use the C<json> read type and |
|
|
507 | rely on the fact that the newline will be skipped as leading whitespace: |
|
|
508 | |
|
|
509 | $handle->push_read (json => sub { my $array = $_[1]; ... }); |
|
|
510 | |
|
|
511 | Other languages could read single lines terminated by a newline and pass |
|
|
512 | this line into their JSON decoder of choice. |
|
|
513 | |
|
|
514 | =cut |
|
|
515 | |
|
|
516 | register_write_type json => sub { |
|
|
517 | my ($self, $ref) = @_; |
|
|
518 | |
|
|
519 | require JSON; |
|
|
520 | |
|
|
521 | $self->{json} ? $self->{json}->encode ($ref) |
|
|
522 | : JSON::encode_json ($ref) |
|
|
523 | }; |
|
|
524 | |
|
|
525 | =item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args) |
|
|
526 | |
|
|
527 | 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 |
|
|
529 | reference with the handle object and the remaining arguments. |
|
|
530 | |
|
|
531 | The code reference is supposed to return a single octet string that will |
|
|
532 | be appended to the write buffer. |
|
|
533 | |
|
|
534 | Note that this is a function, and all types registered this way will be |
|
|
535 | global, so try to use unique names. |
|
|
536 | |
|
|
537 | =cut |
373 | |
538 | |
374 | ############################################################################# |
539 | ############################################################################# |
375 | |
540 | |
376 | =back |
541 | =back |
377 | |
542 | |
… | |
… | |
456 | |
621 | |
457 | if ( |
622 | if ( |
458 | defined $self->{rbuf_max} |
623 | defined $self->{rbuf_max} |
459 | && $self->{rbuf_max} < length $self->{rbuf} |
624 | && $self->{rbuf_max} < length $self->{rbuf} |
460 | ) { |
625 | ) { |
461 | $! = &Errno::ENOSPC; return $self->error; |
626 | $! = &Errno::ENOSPC; |
|
|
627 | $self->error; |
462 | } |
628 | } |
463 | |
629 | |
464 | return if $self->{in_drain}; |
630 | return if $self->{in_drain}; |
465 | local $self->{in_drain} = 1; |
631 | local $self->{in_drain} = 1; |
466 | |
632 | |
467 | while (my $len = length $self->{rbuf}) { |
633 | while (my $len = length $self->{rbuf}) { |
468 | no strict 'refs'; |
634 | no strict 'refs'; |
469 | if (my $cb = shift @{ $self->{queue} }) { |
635 | if (my $cb = shift @{ $self->{_queue} }) { |
470 | unless ($cb->($self)) { |
636 | unless ($cb->($self)) { |
471 | if ($self->{eof}) { |
637 | if ($self->{_eof}) { |
472 | # no progress can be made (not enough data and no data forthcoming) |
638 | # no progress can be made (not enough data and no data forthcoming) |
473 | $! = &Errno::EPIPE; return $self->error; |
639 | $! = &Errno::EPIPE; |
|
|
640 | $self->error; |
474 | } |
641 | } |
475 | |
642 | |
476 | unshift @{ $self->{queue} }, $cb; |
643 | unshift @{ $self->{_queue} }, $cb; |
477 | return; |
644 | return; |
478 | } |
645 | } |
479 | } elsif ($self->{on_read}) { |
646 | } elsif ($self->{on_read}) { |
480 | $self->{on_read}($self); |
647 | $self->{on_read}($self); |
481 | |
648 | |
482 | if ( |
649 | if ( |
483 | $self->{eof} # if no further data will arrive |
650 | $self->{_eof} # if no further data will arrive |
484 | && $len == length $self->{rbuf} # and no data has been consumed |
651 | && $len == length $self->{rbuf} # and no data has been consumed |
485 | && !@{ $self->{queue} } # and the queue is still empty |
652 | && !@{ $self->{_queue} } # and the queue is still empty |
486 | && $self->{on_read} # and we still want to read data |
653 | && $self->{on_read} # and we still want to read data |
487 | ) { |
654 | ) { |
488 | # then no progress can be made |
655 | # then no progress can be made |
489 | $! = &Errno::EPIPE; return $self->error; |
656 | $! = &Errno::EPIPE; |
|
|
657 | $self->error; |
490 | } |
658 | } |
491 | } else { |
659 | } else { |
492 | # read side becomes idle |
660 | # read side becomes idle |
493 | delete $self->{rw}; |
661 | delete $self->{_rw}; |
494 | return; |
662 | return; |
495 | } |
663 | } |
496 | } |
664 | } |
497 | |
665 | |
498 | if ($self->{eof}) { |
|
|
499 | $self->_shutdown; |
|
|
500 | $self->{on_eof}($self) |
666 | $self->{on_eof}($self) |
501 | if $self->{on_eof}; |
667 | if $self->{_eof} && $self->{on_eof}; |
502 | } |
|
|
503 | } |
668 | } |
504 | |
669 | |
505 | =item $handle->on_read ($cb) |
670 | =item $handle->on_read ($cb) |
506 | |
671 | |
507 | This replaces the currently set C<on_read> callback, or clears it (when |
672 | This replaces the currently set C<on_read> callback, or clears it (when |
… | |
… | |
552 | interested in (which can be none at all) and return a true value. After returning |
717 | interested in (which can be none at all) and return a true value. After returning |
553 | true, it will be removed from the queue. |
718 | true, it will be removed from the queue. |
554 | |
719 | |
555 | =cut |
720 | =cut |
556 | |
721 | |
|
|
722 | our %RH; |
|
|
723 | |
|
|
724 | sub register_read_type($$) { |
|
|
725 | $RH{$_[0]} = $_[1]; |
|
|
726 | } |
|
|
727 | |
557 | sub push_read { |
728 | sub push_read { |
558 | my $self = shift; |
729 | my $self = shift; |
559 | my $cb = pop; |
730 | my $cb = pop; |
560 | |
731 | |
561 | if (@_) { |
732 | if (@_) { |
… | |
… | |
563 | |
734 | |
564 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read") |
735 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read") |
565 | ->($self, $cb, @_); |
736 | ->($self, $cb, @_); |
566 | } |
737 | } |
567 | |
738 | |
568 | push @{ $self->{queue} }, $cb; |
739 | push @{ $self->{_queue} }, $cb; |
569 | $self->_drain_rbuf; |
740 | $self->_drain_rbuf; |
570 | } |
741 | } |
571 | |
742 | |
572 | sub unshift_read { |
743 | sub unshift_read { |
573 | my $self = shift; |
744 | my $self = shift; |
… | |
… | |
579 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read") |
750 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read") |
580 | ->($self, $cb, @_); |
751 | ->($self, $cb, @_); |
581 | } |
752 | } |
582 | |
753 | |
583 | |
754 | |
584 | unshift @{ $self->{queue} }, $cb; |
755 | unshift @{ $self->{_queue} }, $cb; |
585 | $self->_drain_rbuf; |
756 | $self->_drain_rbuf; |
586 | } |
757 | } |
587 | |
758 | |
588 | =item $handle->push_read (type => @args, $cb) |
759 | =item $handle->push_read (type => @args, $cb) |
589 | |
760 | |
… | |
… | |
591 | |
762 | |
592 | Instead of providing a callback that parses the data itself you can chose |
763 | Instead of providing a callback that parses the data itself you can chose |
593 | between a number of predefined parsing formats, for chunks of data, lines |
764 | between a number of predefined parsing formats, for chunks of data, lines |
594 | etc. |
765 | etc. |
595 | |
766 | |
596 | The types currently supported are: |
767 | Predefined types are (if you have ideas for additional types, feel free to |
|
|
768 | drop by and tell us): |
597 | |
769 | |
598 | =over 4 |
770 | =over 4 |
599 | |
771 | |
600 | =item chunk => $octets, $cb->($self, $data) |
772 | =item chunk => $octets, $cb->($handle, $data) |
601 | |
773 | |
602 | Invoke the callback only once C<$octets> bytes have been read. Pass the |
774 | Invoke the callback only once C<$octets> bytes have been read. Pass the |
603 | data read to the callback. The callback will never be called with less |
775 | data read to the callback. The callback will never be called with less |
604 | data. |
776 | data. |
605 | |
777 | |
… | |
… | |
628 | |
800 | |
629 | sub unshift_read_chunk { |
801 | sub unshift_read_chunk { |
630 | $_[0]->unshift_read (chunk => $_[1], $_[2]); |
802 | $_[0]->unshift_read (chunk => $_[1], $_[2]); |
631 | } |
803 | } |
632 | |
804 | |
633 | =item line => [$eol, ]$cb->($self, $line, $eol) |
805 | =item line => [$eol, ]$cb->($handle, $line, $eol) |
634 | |
806 | |
635 | The callback will be called only once a full line (including the end of |
807 | The callback will be called only once a full line (including the end of |
636 | line marker, C<$eol>) has been read. This line (excluding the end of line |
808 | line marker, C<$eol>) has been read. This line (excluding the end of line |
637 | marker) will be passed to the callback as second argument (C<$line>), and |
809 | marker) will be passed to the callback as second argument (C<$line>), and |
638 | the end of line marker as the third argument (C<$eol>). |
810 | the end of line marker as the third argument (C<$eol>). |
… | |
… | |
675 | sub unshift_read_line { |
847 | sub unshift_read_line { |
676 | my $self = shift; |
848 | my $self = shift; |
677 | $self->unshift_read (line => @_); |
849 | $self->unshift_read (line => @_); |
678 | } |
850 | } |
679 | |
851 | |
680 | =item netstring => $cb->($string) |
852 | =item netstring => $cb->($handle, $string) |
681 | |
853 | |
682 | A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement). |
854 | A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement). |
683 | |
855 | |
684 | Throws an error with C<$!> set to EBADMSG on format violations. |
856 | Throws an error with C<$!> set to EBADMSG on format violations. |
685 | |
857 | |
… | |
… | |
713 | |
885 | |
714 | 1 |
886 | 1 |
715 | } |
887 | } |
716 | }; |
888 | }; |
717 | |
889 | |
|
|
890 | =item regex => $accept[, $reject[, $skip], $cb->($handle, $data) |
|
|
891 | |
|
|
892 | Makes a regex match against the regex object C<$accept> and returns |
|
|
893 | everything up to and including the match. |
|
|
894 | |
|
|
895 | Example: read a single line terminated by '\n'. |
|
|
896 | |
|
|
897 | $handle->push_read (regex => qr<\n>, sub { ... }); |
|
|
898 | |
|
|
899 | If C<$reject> is given and not undef, then it determines when the data is |
|
|
900 | to be rejected: it is matched against the data when the C<$accept> regex |
|
|
901 | does not match and generates an C<EBADMSG> error when it matches. This is |
|
|
902 | useful to quickly reject wrong data (to avoid waiting for a timeout or a |
|
|
903 | receive buffer overflow). |
|
|
904 | |
|
|
905 | Example: expect a single decimal number followed by whitespace, reject |
|
|
906 | anything else (not the use of an anchor). |
|
|
907 | |
|
|
908 | $handle->push_read (regex => qr<^[0-9]+\s>, qr<[^0-9]>, sub { ... }); |
|
|
909 | |
|
|
910 | If C<$skip> is given and not C<undef>, then it will be matched against |
|
|
911 | the receive buffer when neither C<$accept> nor C<$reject> match, |
|
|
912 | and everything preceding and including the match will be accepted |
|
|
913 | unconditionally. This is useful to skip large amounts of data that you |
|
|
914 | know cannot be matched, so that the C<$accept> or C<$reject> regex do not |
|
|
915 | have to start matching from the beginning. This is purely an optimisation |
|
|
916 | and is usually worth only when you expect more than a few kilobytes. |
|
|
917 | |
|
|
918 | Example: expect a http header, which ends at C<\015\012\015\012>. Since we |
|
|
919 | expect the header to be very large (it isn't in practise, but...), we use |
|
|
920 | a skip regex to skip initial portions. The skip regex is tricky in that |
|
|
921 | it only accepts something not ending in either \015 or \012, as these are |
|
|
922 | required for the accept regex. |
|
|
923 | |
|
|
924 | $handle->push_read (regex => |
|
|
925 | qr<\015\012\015\012>, |
|
|
926 | undef, # no reject |
|
|
927 | qr<^.*[^\015\012]>, |
|
|
928 | sub { ... }); |
|
|
929 | |
|
|
930 | =cut |
|
|
931 | |
|
|
932 | register_read_type regex => sub { |
|
|
933 | my ($self, $cb, $accept, $reject, $skip) = @_; |
|
|
934 | |
|
|
935 | my $data; |
|
|
936 | my $rbuf = \$self->{rbuf}; |
|
|
937 | |
|
|
938 | sub { |
|
|
939 | # accept |
|
|
940 | if ($$rbuf =~ $accept) { |
|
|
941 | $data .= substr $$rbuf, 0, $+[0], ""; |
|
|
942 | $cb->($self, $data); |
|
|
943 | return 1; |
|
|
944 | } |
|
|
945 | |
|
|
946 | # reject |
|
|
947 | if ($reject && $$rbuf =~ $reject) { |
|
|
948 | $! = &Errno::EBADMSG; |
|
|
949 | $self->error; |
|
|
950 | } |
|
|
951 | |
|
|
952 | # skip |
|
|
953 | if ($skip && $$rbuf =~ $skip) { |
|
|
954 | $data .= substr $$rbuf, 0, $+[0], ""; |
|
|
955 | } |
|
|
956 | |
|
|
957 | () |
|
|
958 | } |
|
|
959 | }; |
|
|
960 | |
|
|
961 | =item json => $cb->($handle, $hash_or_arrayref) |
|
|
962 | |
|
|
963 | Reads a JSON object or array, decodes it and passes it to the callback. |
|
|
964 | |
|
|
965 | If a C<json> object was passed to the constructor, then that will be used |
|
|
966 | for the final decode, otherwise it will create a JSON coder expecting UTF-8. |
|
|
967 | |
|
|
968 | This read type uses the incremental parser available with JSON version |
|
|
969 | 2.09 (and JSON::XS version 2.2) and above. You have to provide a |
|
|
970 | dependency on your own: this module will load the JSON module, but |
|
|
971 | AnyEvent does not depend on it itself. |
|
|
972 | |
|
|
973 | Since JSON texts are fully self-delimiting, the C<json> read and write |
|
|
974 | types are an ideal simple RPC protocol: just exchange JSON datagrams. See |
|
|
975 | the C<json> write type description, above, for an actual example. |
|
|
976 | |
|
|
977 | =cut |
|
|
978 | |
|
|
979 | register_read_type json => sub { |
|
|
980 | my ($self, $cb, $accept, $reject, $skip) = @_; |
|
|
981 | |
|
|
982 | require JSON; |
|
|
983 | |
|
|
984 | my $data; |
|
|
985 | my $rbuf = \$self->{rbuf}; |
|
|
986 | |
|
|
987 | my $json = $self->{json} ||= JSON->new->utf8; |
|
|
988 | |
|
|
989 | sub { |
|
|
990 | my $ref = $json->incr_parse ($self->{rbuf}); |
|
|
991 | |
|
|
992 | if ($ref) { |
|
|
993 | $self->{rbuf} = $json->incr_text; |
|
|
994 | $json->incr_text = ""; |
|
|
995 | $cb->($self, $ref); |
|
|
996 | |
|
|
997 | 1 |
|
|
998 | } else { |
|
|
999 | $self->{rbuf} = ""; |
|
|
1000 | () |
|
|
1001 | } |
|
|
1002 | } |
|
|
1003 | }; |
|
|
1004 | |
718 | =back |
1005 | =back |
|
|
1006 | |
|
|
1007 | =item AnyEvent::Handle::register_read_type type => $coderef->($handle, $cb, @args) |
|
|
1008 | |
|
|
1009 | This function (not method) lets you add your own types to C<push_read>. |
|
|
1010 | |
|
|
1011 | Whenever the given C<type> is used, C<push_read> will invoke the code |
|
|
1012 | reference with the handle object, the callback and the remaining |
|
|
1013 | arguments. |
|
|
1014 | |
|
|
1015 | The code reference is supposed to return a callback (usually a closure) |
|
|
1016 | that works as a plain read callback (see C<< ->push_read ($cb) >>). |
|
|
1017 | |
|
|
1018 | It should invoke the passed callback when it is done reading (remember to |
|
|
1019 | pass C<$handle> as first argument as all other callbacks do that). |
|
|
1020 | |
|
|
1021 | Note that this is a function, and all types registered this way will be |
|
|
1022 | global, so try to use unique names. |
|
|
1023 | |
|
|
1024 | For examples, see the source of this module (F<perldoc -m AnyEvent::Handle>, |
|
|
1025 | search for C<register_read_type>)). |
719 | |
1026 | |
720 | =item $handle->stop_read |
1027 | =item $handle->stop_read |
721 | |
1028 | |
722 | =item $handle->start_read |
1029 | =item $handle->start_read |
723 | |
1030 | |
… | |
… | |
729 | =cut |
1036 | =cut |
730 | |
1037 | |
731 | sub stop_read { |
1038 | sub stop_read { |
732 | my ($self) = @_; |
1039 | my ($self) = @_; |
733 | |
1040 | |
734 | delete $self->{rw}; |
1041 | delete $self->{_rw}; |
735 | } |
1042 | } |
736 | |
1043 | |
737 | sub start_read { |
1044 | sub start_read { |
738 | my ($self) = @_; |
1045 | my ($self) = @_; |
739 | |
1046 | |
740 | unless ($self->{rw} || $self->{eof}) { |
1047 | unless ($self->{_rw} || $self->{_eof}) { |
741 | Scalar::Util::weaken $self; |
1048 | Scalar::Util::weaken $self; |
742 | |
1049 | |
743 | $self->{rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub { |
1050 | $self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub { |
744 | my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf}; |
1051 | my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf}; |
745 | my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf; |
1052 | my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf; |
746 | |
1053 | |
747 | if ($len > 0) { |
1054 | if ($len > 0) { |
|
|
1055 | $self->{_activity} = AnyEvent->now; |
|
|
1056 | |
748 | $self->{filter_r} |
1057 | $self->{filter_r} |
749 | ? $self->{filter_r}->($self, $rbuf) |
1058 | ? $self->{filter_r}($self, $rbuf) |
750 | : $self->_drain_rbuf; |
1059 | : $self->_drain_rbuf; |
751 | |
1060 | |
752 | } elsif (defined $len) { |
1061 | } elsif (defined $len) { |
753 | delete $self->{rw}; |
1062 | delete $self->{_rw}; |
754 | $self->{eof} = 1; |
1063 | $self->{_eof} = 1; |
755 | $self->_drain_rbuf; |
1064 | $self->_drain_rbuf; |
756 | |
1065 | |
757 | } elsif ($! != EAGAIN && $! != EINTR) { |
1066 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) { |
758 | return $self->error; |
1067 | return $self->error; |
759 | } |
1068 | } |
760 | }); |
1069 | }); |
761 | } |
1070 | } |
762 | } |
1071 | } |
763 | |
1072 | |
764 | sub _dotls { |
1073 | sub _dotls { |
765 | my ($self) = @_; |
1074 | my ($self) = @_; |
766 | |
1075 | |
767 | if (length $self->{tls_wbuf}) { |
1076 | if (length $self->{_tls_wbuf}) { |
768 | while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{tls_wbuf})) > 0) { |
1077 | while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) { |
769 | substr $self->{tls_wbuf}, 0, $len, ""; |
1078 | substr $self->{_tls_wbuf}, 0, $len, ""; |
770 | } |
1079 | } |
771 | } |
1080 | } |
772 | |
1081 | |
773 | if (defined (my $buf = Net::SSLeay::BIO_read ($self->{tls_wbio}))) { |
1082 | if (defined (my $buf = Net::SSLeay::BIO_read ($self->{_wbio}))) { |
774 | $self->{wbuf} .= $buf; |
1083 | $self->{wbuf} .= $buf; |
775 | $self->_drain_wbuf; |
1084 | $self->_drain_wbuf; |
776 | } |
1085 | } |
777 | |
1086 | |
778 | while (defined (my $buf = Net::SSLeay::read ($self->{tls}))) { |
1087 | while (defined (my $buf = Net::SSLeay::read ($self->{tls}))) { |
… | |
… | |
804 | C<"connect">, C<"accept"> or an existing Net::SSLeay object). |
1113 | C<"connect">, C<"accept"> or an existing Net::SSLeay object). |
805 | |
1114 | |
806 | The second argument is the optional C<Net::SSLeay::CTX> object that is |
1115 | The second argument is the optional C<Net::SSLeay::CTX> object that is |
807 | used when AnyEvent::Handle has to create its own TLS connection object. |
1116 | used when AnyEvent::Handle has to create its own TLS connection object. |
808 | |
1117 | |
809 | =cut |
1118 | The TLS connection object will end up in C<< $handle->{tls} >> after this |
|
|
1119 | call and can be used or changed to your liking. Note that the handshake |
|
|
1120 | might have already started when this function returns. |
810 | |
1121 | |
811 | # TODO: maybe document... |
1122 | =cut |
|
|
1123 | |
812 | sub starttls { |
1124 | sub starttls { |
813 | my ($self, $ssl, $ctx) = @_; |
1125 | my ($self, $ssl, $ctx) = @_; |
814 | |
1126 | |
815 | $self->stoptls; |
1127 | $self->stoptls; |
816 | |
1128 | |
… | |
… | |
828 | # but the openssl maintainers basically said: "trust us, it just works". |
1140 | # but the openssl maintainers basically said: "trust us, it just works". |
829 | # (unfortunately, we have to hardcode constants because the abysmally misdesigned |
1141 | # (unfortunately, we have to hardcode constants because the abysmally misdesigned |
830 | # and mismaintained ssleay-module doesn't even offer them). |
1142 | # and mismaintained ssleay-module doesn't even offer them). |
831 | # http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html |
1143 | # http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html |
832 | Net::SSLeay::CTX_set_mode ($self->{tls}, |
1144 | Net::SSLeay::CTX_set_mode ($self->{tls}, |
833 | (eval { Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1) |
1145 | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1) |
834 | | (eval { Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2)); |
1146 | | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2)); |
835 | |
1147 | |
836 | $self->{tls_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
1148 | $self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
837 | $self->{tls_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
1149 | $self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
838 | |
1150 | |
839 | Net::SSLeay::set_bio ($ssl, $self->{tls_rbio}, $self->{tls_wbio}); |
1151 | Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio}); |
840 | |
1152 | |
841 | $self->{filter_w} = sub { |
1153 | $self->{filter_w} = sub { |
842 | $_[0]{tls_wbuf} .= ${$_[1]}; |
1154 | $_[0]{_tls_wbuf} .= ${$_[1]}; |
843 | &_dotls; |
1155 | &_dotls; |
844 | }; |
1156 | }; |
845 | $self->{filter_r} = sub { |
1157 | $self->{filter_r} = sub { |
846 | Net::SSLeay::BIO_write ($_[0]{tls_rbio}, ${$_[1]}); |
1158 | Net::SSLeay::BIO_write ($_[0]{_rbio}, ${$_[1]}); |
847 | &_dotls; |
1159 | &_dotls; |
848 | }; |
1160 | }; |
849 | } |
1161 | } |
850 | |
1162 | |
851 | =item $handle->stoptls |
1163 | =item $handle->stoptls |
… | |
… | |
857 | |
1169 | |
858 | sub stoptls { |
1170 | sub stoptls { |
859 | my ($self) = @_; |
1171 | my ($self) = @_; |
860 | |
1172 | |
861 | Net::SSLeay::free (delete $self->{tls}) if $self->{tls}; |
1173 | Net::SSLeay::free (delete $self->{tls}) if $self->{tls}; |
|
|
1174 | |
862 | delete $self->{tls_rbio}; |
1175 | delete $self->{_rbio}; |
863 | delete $self->{tls_wbio}; |
1176 | delete $self->{_wbio}; |
864 | delete $self->{tls_wbuf}; |
1177 | delete $self->{_tls_wbuf}; |
865 | delete $self->{filter_r}; |
1178 | delete $self->{filter_r}; |
866 | delete $self->{filter_w}; |
1179 | delete $self->{filter_w}; |
867 | } |
1180 | } |
868 | |
1181 | |
869 | sub DESTROY { |
1182 | sub DESTROY { |
… | |
… | |
907 | } |
1220 | } |
908 | } |
1221 | } |
909 | |
1222 | |
910 | =back |
1223 | =back |
911 | |
1224 | |
|
|
1225 | =head1 SUBCLASSING AnyEvent::Handle |
|
|
1226 | |
|
|
1227 | In many cases, you might want to subclass AnyEvent::Handle. |
|
|
1228 | |
|
|
1229 | To make this easier, a given version of AnyEvent::Handle uses these |
|
|
1230 | conventions: |
|
|
1231 | |
|
|
1232 | =over 4 |
|
|
1233 | |
|
|
1234 | =item * all constructor arguments become object members. |
|
|
1235 | |
|
|
1236 | At least initially, when you pass a C<tls>-argument to the constructor it |
|
|
1237 | will end up in C<< $handle->{tls} >>. Those members might be changes or |
|
|
1238 | mutated later on (for example C<tls> will hold the TLS connection object). |
|
|
1239 | |
|
|
1240 | =item * other object member names are prefixed with an C<_>. |
|
|
1241 | |
|
|
1242 | All object members not explicitly documented (internal use) are prefixed |
|
|
1243 | with an underscore character, so the remaining non-C<_>-namespace is free |
|
|
1244 | for use for subclasses. |
|
|
1245 | |
|
|
1246 | =item * all members not documented here and not prefixed with an underscore |
|
|
1247 | are free to use in subclasses. |
|
|
1248 | |
|
|
1249 | Of course, new versions of AnyEvent::Handle may introduce more "public" |
|
|
1250 | member variables, but thats just life, at least it is documented. |
|
|
1251 | |
|
|
1252 | =back |
|
|
1253 | |
912 | =head1 AUTHOR |
1254 | =head1 AUTHOR |
913 | |
1255 | |
914 | Robin Redeker C<< <elmex at ta-sa.org> >>, Marc Lehmann <schmorp@schmorp.de>. |
1256 | Robin Redeker C<< <elmex at ta-sa.org> >>, Marc Lehmann <schmorp@schmorp.de>. |
915 | |
1257 | |
916 | =cut |
1258 | =cut |