… | |
… | |
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 qw(WSAWOULDBLOCK); |
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 | |
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73 | The filehandle this L<AnyEvent::Handle> object will operate on. |
73 | The filehandle this L<AnyEvent::Handle> object will operate on. |
74 | |
74 | |
75 | NOTE: The filehandle will be set to non-blocking (using |
75 | NOTE: The filehandle will be set to non-blocking (using |
76 | AnyEvent::Util::fh_nonblocking). |
76 | AnyEvent::Util::fh_nonblocking). |
77 | |
77 | |
78 | =item on_eof => $cb->($self) |
78 | =item on_eof => $cb->($handle) |
79 | |
79 | |
80 | Set the callback to be called on EOF. |
80 | Set the callback to be called on EOF. |
81 | |
81 | |
82 | 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, |
83 | 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 |
84 | waiting for data. |
84 | waiting for data. |
85 | |
85 | |
86 | =item on_error => $cb->($self) |
86 | =item on_error => $cb->($handle) |
87 | |
87 | |
88 | 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 |
89 | 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 |
90 | or a read error. |
90 | or a read error. |
91 | |
91 | |
92 | 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 |
93 | called. |
93 | called. |
94 | |
94 | |
95 | On callback entrance, the value of C<$!> contains the operating system |
95 | On callback entrance, the value of C<$!> contains the operating system |
96 | error (or C<ENOSPC>, C<EPIPE> or C<EBADMSG>). |
96 | error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>). |
97 | |
97 | |
98 | The callback should throw an exception. If it returns, then |
98 | The callback should throw an exception. If it returns, then |
99 | AnyEvent::Handle will C<croak> for you. |
99 | AnyEvent::Handle will C<croak> for you. |
100 | |
100 | |
101 | 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 |
102 | 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 |
103 | die. |
103 | die. |
104 | |
104 | |
105 | =item on_read => $cb->($self) |
105 | =item on_read => $cb->($handle) |
106 | |
106 | |
107 | 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 |
108 | and no read request is in the queue. |
108 | and no read request is in the queue. |
109 | |
109 | |
110 | 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 >> |
111 | method or access the C<$self->{rbuf}> member directly. |
111 | method or access the C<$handle->{rbuf}> member directly. |
112 | |
112 | |
113 | 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 |
114 | 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 |
115 | 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 |
116 | error will be raised (with C<$!> set to C<EPIPE>). |
116 | error will be raised (with C<$!> set to C<EPIPE>). |
117 | |
117 | |
118 | =item on_drain => $cb->() |
118 | =item on_drain => $cb->($handle) |
119 | |
119 | |
120 | 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 |
121 | (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). |
122 | |
122 | |
123 | 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> errror 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. |
124 | |
144 | |
125 | =item rbuf_max => <bytes> |
145 | =item rbuf_max => <bytes> |
126 | |
146 | |
127 | 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>) |
128 | 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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… | |
168 | |
188 | |
169 | 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 |
170 | (unless a connection object was specified directly). If this parameter is |
190 | (unless a connection object was specified directly). If this parameter is |
171 | missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>. |
191 | missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>. |
172 | |
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 | |
173 | =item filter_r => $cb |
203 | =item filter_r => $cb |
174 | |
204 | |
175 | =item filter_w => $cb |
205 | =item filter_w => $cb |
176 | |
206 | |
177 | These exist, but are undocumented at this time. |
207 | These exist, but are undocumented at this time. |
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192 | if ($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 | } |
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252 | |
285 | |
253 | sub on_eof { |
286 | sub on_eof { |
254 | $_[0]{on_eof} = $_[1]; |
287 | $_[0]{on_eof} = $_[1]; |
255 | } |
288 | } |
256 | |
289 | |
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290 | =item $handle->on_timeout ($cb) |
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291 | |
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292 | Replace the current C<on_timeout> callback, or disables the callback |
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293 | (but not the timeout) if C<$cb> = C<undef>. See C<timeout> constructor |
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294 | argument. |
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295 | |
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296 | =cut |
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297 | |
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298 | sub on_timeout { |
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299 | $_[0]{on_timeout} = $_[1]; |
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300 | } |
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301 | |
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302 | ############################################################################# |
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303 | |
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304 | =item $handle->timeout ($seconds) |
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305 | |
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306 | Configures (or disables) the inactivity timeout. |
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307 | |
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308 | =cut |
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309 | |
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310 | sub timeout { |
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311 | my ($self, $timeout) = @_; |
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312 | |
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313 | $self->{timeout} = $timeout; |
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314 | $self->_timeout; |
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315 | } |
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316 | |
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317 | # reset the timeout watcher, as neccessary |
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318 | # also check for time-outs |
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319 | sub _timeout { |
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320 | my ($self) = @_; |
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321 | |
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322 | if ($self->{timeout}) { |
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323 | my $NOW = AnyEvent->now; |
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324 | |
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325 | # when would the timeout trigger? |
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326 | my $after = $self->{_activity} + $self->{timeout} - $NOW; |
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327 | |
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328 | # now or in the past already? |
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329 | if ($after <= 0) { |
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330 | $self->{_activity} = $NOW; |
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331 | |
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332 | if ($self->{on_timeout}) { |
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333 | $self->{on_timeout}->($self); |
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334 | } else { |
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335 | $! = Errno::ETIMEDOUT; |
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336 | $self->error; |
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337 | } |
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338 | |
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339 | # callbakx could have changed timeout value, optimise |
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340 | return unless $self->{timeout}; |
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341 | |
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342 | # calculate new after |
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343 | $after = $self->{timeout}; |
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344 | } |
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345 | |
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346 | Scalar::Util::weaken $self; |
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347 | |
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348 | $self->{_tw} ||= AnyEvent->timer (after => $after, cb => sub { |
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349 | delete $self->{_tw}; |
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350 | $self->_timeout; |
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351 | }); |
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352 | } else { |
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353 | delete $self->{_tw}; |
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354 | } |
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355 | } |
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356 | |
257 | ############################################################################# |
357 | ############################################################################# |
258 | |
358 | |
259 | =back |
359 | =back |
260 | |
360 | |
261 | =head2 WRITE QUEUE |
361 | =head2 WRITE QUEUE |
… | |
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306 | my $len = syswrite $self->{fh}, $self->{wbuf}; |
406 | my $len = syswrite $self->{fh}, $self->{wbuf}; |
307 | |
407 | |
308 | if ($len >= 0) { |
408 | if ($len >= 0) { |
309 | substr $self->{wbuf}, 0, $len, ""; |
409 | substr $self->{wbuf}, 0, $len, ""; |
310 | |
410 | |
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411 | $self->{_activity} = AnyEvent->now; |
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412 | |
311 | $self->{on_drain}($self) |
413 | $self->{on_drain}($self) |
312 | if $self->{low_water_mark} >= length $self->{wbuf} |
414 | if $self->{low_water_mark} >= length $self->{wbuf} |
313 | && $self->{on_drain}; |
415 | && $self->{on_drain}; |
314 | |
416 | |
315 | delete $self->{_ww} unless length $self->{wbuf}; |
417 | delete $self->{_ww} unless length $self->{wbuf}; |
316 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAWOULDBLOCK) { |
418 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) { |
317 | $self->error; |
419 | $self->error; |
318 | } |
420 | } |
319 | }; |
421 | }; |
320 | |
422 | |
321 | # try to write data immediately |
423 | # try to write data immediately |
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376 | my ($self, $string) = @_; |
478 | my ($self, $string) = @_; |
377 | |
479 | |
378 | sprintf "%d:%s,", (length $string), $string |
480 | sprintf "%d:%s,", (length $string), $string |
379 | }; |
481 | }; |
380 | |
482 | |
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483 | =item json => $array_or_hashref |
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484 | |
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485 | Encodes the given hash or array reference into a JSON object. Unless you |
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486 | provide your own JSON object, this means it will be encoded to JSON text |
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487 | in UTF-8. |
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488 | |
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489 | JSON objects (and arrays) are self-delimiting, so you can write JSON at |
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490 | one end of a handle and read them at the other end without using any |
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491 | additional framing. |
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492 | |
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493 | The generated JSON text is guaranteed not to contain any newlines: While |
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494 | this module doesn't need delimiters after or between JSON texts to be |
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495 | able to read them, many other languages depend on that. |
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496 | |
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497 | A simple RPC protocol that interoperates easily with others is to send |
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498 | JSON arrays (or objects, although arrays are usually the better choice as |
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499 | they mimic how function argument passing works) and a newline after each |
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500 | JSON text: |
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501 | |
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502 | $handle->push_write (json => ["method", "arg1", "arg2"]); # whatever |
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503 | $handle->push_write ("\012"); |
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504 | |
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505 | An AnyEvent::Handle receiver would simply use the C<json> read type and |
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506 | rely on the fact that the newline will be skipped as leading whitespace: |
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507 | |
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508 | $handle->push_read (json => sub { my $array = $_[1]; ... }); |
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509 | |
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510 | Other languages could read single lines terminated by a newline and pass |
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511 | this line into their JSON decoder of choice. |
|
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512 | |
|
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513 | =cut |
|
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514 | |
|
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515 | register_write_type json => sub { |
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516 | my ($self, $ref) = @_; |
|
|
517 | |
|
|
518 | require JSON; |
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519 | |
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520 | $self->{json} ? $self->{json}->encode ($ref) |
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521 | : JSON::encode_json ($ref) |
|
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522 | }; |
|
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523 | |
381 | =item AnyEvent::Handle::register_write_type type => $coderef->($self, @args) |
524 | =item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args) |
382 | |
525 | |
383 | This function (not method) lets you add your own types to C<push_write>. |
526 | This function (not method) lets you add your own types to C<push_write>. |
384 | Whenever the given C<type> is used, C<push_write> will invoke the code |
527 | Whenever the given C<type> is used, C<push_write> will invoke the code |
385 | reference with the handle object and the remaining arguments. |
528 | reference with the handle object and the remaining arguments. |
386 | |
529 | |
… | |
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626 | Predefined types are (if you have ideas for additional types, feel free to |
769 | Predefined types are (if you have ideas for additional types, feel free to |
627 | drop by and tell us): |
770 | drop by and tell us): |
628 | |
771 | |
629 | =over 4 |
772 | =over 4 |
630 | |
773 | |
631 | =item chunk => $octets, $cb->($self, $data) |
774 | =item chunk => $octets, $cb->($handle, $data) |
632 | |
775 | |
633 | Invoke the callback only once C<$octets> bytes have been read. Pass the |
776 | Invoke the callback only once C<$octets> bytes have been read. Pass the |
634 | data read to the callback. The callback will never be called with less |
777 | data read to the callback. The callback will never be called with less |
635 | data. |
778 | data. |
636 | |
779 | |
… | |
… | |
659 | |
802 | |
660 | sub unshift_read_chunk { |
803 | sub unshift_read_chunk { |
661 | $_[0]->unshift_read (chunk => $_[1], $_[2]); |
804 | $_[0]->unshift_read (chunk => $_[1], $_[2]); |
662 | } |
805 | } |
663 | |
806 | |
664 | =item line => [$eol, ]$cb->($self, $line, $eol) |
807 | =item line => [$eol, ]$cb->($handle, $line, $eol) |
665 | |
808 | |
666 | The callback will be called only once a full line (including the end of |
809 | The callback will be called only once a full line (including the end of |
667 | line marker, C<$eol>) has been read. This line (excluding the end of line |
810 | line marker, C<$eol>) has been read. This line (excluding the end of line |
668 | marker) will be passed to the callback as second argument (C<$line>), and |
811 | marker) will be passed to the callback as second argument (C<$line>), and |
669 | the end of line marker as the third argument (C<$eol>). |
812 | the end of line marker as the third argument (C<$eol>). |
… | |
… | |
706 | sub unshift_read_line { |
849 | sub unshift_read_line { |
707 | my $self = shift; |
850 | my $self = shift; |
708 | $self->unshift_read (line => @_); |
851 | $self->unshift_read (line => @_); |
709 | } |
852 | } |
710 | |
853 | |
711 | =item netstring => $cb->($string) |
854 | =item netstring => $cb->($handle, $string) |
712 | |
855 | |
713 | A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement). |
856 | A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement). |
714 | |
857 | |
715 | Throws an error with C<$!> set to EBADMSG on format violations. |
858 | Throws an error with C<$!> set to EBADMSG on format violations. |
716 | |
859 | |
… | |
… | |
744 | |
887 | |
745 | 1 |
888 | 1 |
746 | } |
889 | } |
747 | }; |
890 | }; |
748 | |
891 | |
749 | =item regex => $accept[, $reject[, $skip], $cb->($data) |
892 | =item regex => $accept[, $reject[, $skip], $cb->($handle, $data) |
750 | |
893 | |
751 | Makes a regex match against the regex object C<$accept> and returns |
894 | Makes a regex match against the regex object C<$accept> and returns |
752 | everything up to and including the match. |
895 | everything up to and including the match. |
753 | |
896 | |
754 | Example: read a single line terminated by '\n'. |
897 | Example: read a single line terminated by '\n'. |
… | |
… | |
815 | |
958 | |
816 | () |
959 | () |
817 | } |
960 | } |
818 | }; |
961 | }; |
819 | |
962 | |
|
|
963 | =item json => $cb->($handle, $hash_or_arrayref) |
|
|
964 | |
|
|
965 | Reads a JSON object or array, decodes it and passes it to the callback. |
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|
966 | |
|
|
967 | If a C<json> object was passed to the constructor, then that will be used |
|
|
968 | for the final decode, otherwise it will create a JSON coder expecting UTF-8. |
|
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969 | |
|
|
970 | This read type uses the incremental parser available with JSON version |
|
|
971 | 2.09 (and JSON::XS version 2.2) and above. You have to provide a |
|
|
972 | dependency on your own: this module will load the JSON module, but |
|
|
973 | AnyEvent does not depend on it itself. |
|
|
974 | |
|
|
975 | Since JSON texts are fully self-delimiting, the C<json> read and write |
|
|
976 | types are an ideal simple RPC protocol: just exchange JSON datagrams. See |
|
|
977 | the C<json> write type description, above, for an actual example. |
|
|
978 | |
|
|
979 | =cut |
|
|
980 | |
|
|
981 | register_read_type json => sub { |
|
|
982 | my ($self, $cb, $accept, $reject, $skip) = @_; |
|
|
983 | |
|
|
984 | require JSON; |
|
|
985 | |
|
|
986 | my $data; |
|
|
987 | my $rbuf = \$self->{rbuf}; |
|
|
988 | |
|
|
989 | my $json = $self->{json} ||= JSON->new->utf8; |
|
|
990 | |
|
|
991 | sub { |
|
|
992 | my $ref = $json->incr_parse ($self->{rbuf}); |
|
|
993 | |
|
|
994 | if ($ref) { |
|
|
995 | $self->{rbuf} = $json->incr_text; |
|
|
996 | $json->incr_text = ""; |
|
|
997 | $cb->($self, $ref); |
|
|
998 | |
|
|
999 | 1 |
|
|
1000 | } else { |
|
|
1001 | $self->{rbuf} = ""; |
|
|
1002 | () |
|
|
1003 | } |
|
|
1004 | } |
|
|
1005 | }; |
|
|
1006 | |
820 | =back |
1007 | =back |
821 | |
1008 | |
822 | =item AnyEvent::Handle::register_read_type type => $coderef->($self, $cb, @args) |
1009 | =item AnyEvent::Handle::register_read_type type => $coderef->($handle, $cb, @args) |
823 | |
1010 | |
824 | This function (not method) lets you add your own types to C<push_read>. |
1011 | This function (not method) lets you add your own types to C<push_read>. |
825 | |
1012 | |
826 | Whenever the given C<type> is used, C<push_read> will invoke the code |
1013 | Whenever the given C<type> is used, C<push_read> will invoke the code |
827 | reference with the handle object, the callback and the remaining |
1014 | reference with the handle object, the callback and the remaining |
… | |
… | |
829 | |
1016 | |
830 | The code reference is supposed to return a callback (usually a closure) |
1017 | The code reference is supposed to return a callback (usually a closure) |
831 | that works as a plain read callback (see C<< ->push_read ($cb) >>). |
1018 | that works as a plain read callback (see C<< ->push_read ($cb) >>). |
832 | |
1019 | |
833 | It should invoke the passed callback when it is done reading (remember to |
1020 | It should invoke the passed callback when it is done reading (remember to |
834 | pass C<$self> as first argument as all other callbacks do that). |
1021 | pass C<$handle> as first argument as all other callbacks do that). |
835 | |
1022 | |
836 | Note that this is a function, and all types registered this way will be |
1023 | Note that this is a function, and all types registered this way will be |
837 | global, so try to use unique names. |
1024 | global, so try to use unique names. |
838 | |
1025 | |
839 | For examples, see the source of this module (F<perldoc -m AnyEvent::Handle>, |
1026 | For examples, see the source of this module (F<perldoc -m AnyEvent::Handle>, |
… | |
… | |
865 | $self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub { |
1052 | $self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub { |
866 | my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf}; |
1053 | my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf}; |
867 | my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf; |
1054 | my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf; |
868 | |
1055 | |
869 | if ($len > 0) { |
1056 | if ($len > 0) { |
|
|
1057 | $self->{_activity} = AnyEvent->now; |
|
|
1058 | |
870 | $self->{filter_r} |
1059 | $self->{filter_r} |
871 | ? $self->{filter_r}->($self, $rbuf) |
1060 | ? $self->{filter_r}->($self, $rbuf) |
872 | : $self->_drain_rbuf; |
1061 | : $self->_drain_rbuf; |
873 | |
1062 | |
874 | } elsif (defined $len) { |
1063 | } elsif (defined $len) { |
875 | delete $self->{_rw}; |
1064 | delete $self->{_rw}; |
|
|
1065 | delete $self->{_ww}; |
|
|
1066 | delete $self->{_tw}; |
876 | $self->{_eof} = 1; |
1067 | $self->{_eof} = 1; |
877 | $self->_drain_rbuf; |
1068 | $self->_drain_rbuf; |
878 | |
1069 | |
879 | } elsif ($! != EAGAIN && $! != EINTR && $! != &AnyEvent::Util::WSAWOULDBLOCK) { |
1070 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) { |
880 | return $self->error; |
1071 | return $self->error; |
881 | } |
1072 | } |
882 | }); |
1073 | }); |
883 | } |
1074 | } |
884 | } |
1075 | } |