1 | package AnyEvent::Handle; |
1 | package AnyEvent::Handle; |
2 | |
2 | |
3 | no warnings; |
3 | no warnings; |
4 | use strict; |
4 | use strict qw(subs vars); |
5 | |
5 | |
6 | use AnyEvent (); |
6 | use AnyEvent (); |
7 | use AnyEvent::Util qw(WSAEWOULDBLOCK); |
7 | use AnyEvent::Util qw(WSAEWOULDBLOCK); |
8 | use Scalar::Util (); |
8 | use Scalar::Util (); |
9 | use Carp (); |
9 | use Carp (); |
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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 | =cut |
17 | =cut |
18 | |
18 | |
19 | our $VERSION = 4.151; |
19 | our $VERSION = 4.232; |
20 | |
20 | |
21 | =head1 SYNOPSIS |
21 | =head1 SYNOPSIS |
22 | |
22 | |
23 | use AnyEvent; |
23 | use AnyEvent; |
24 | use AnyEvent::Handle; |
24 | use AnyEvent::Handle; |
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49 | |
49 | |
50 | 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 |
51 | filehandles. For utility functions for doing non-blocking connects and accepts |
51 | filehandles. For utility functions for doing non-blocking connects and accepts |
52 | on sockets see L<AnyEvent::Util>. |
52 | on sockets see L<AnyEvent::Util>. |
53 | |
53 | |
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54 | The L<AnyEvent::Intro> tutorial contains some well-documented |
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55 | AnyEvent::Handle examples. |
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56 | |
54 | In the following, when the documentation refers to of "bytes" then this |
57 | 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 |
58 | means characters. As sysread and syswrite are used for all I/O, their |
56 | treatment of characters applies to this module as well. |
59 | treatment of characters applies to this module as well. |
57 | |
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 |
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70 | |
73 | |
71 | =item fh => $filehandle [MANDATORY] |
74 | =item fh => $filehandle [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 | |
77 | |
75 | NOTE: The filehandle will be set to non-blocking (using |
78 | NOTE: The filehandle will be set to non-blocking mode (using |
76 | AnyEvent::Util::fh_nonblocking). |
79 | C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in |
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80 | that mode. |
77 | |
81 | |
78 | =item on_eof => $cb->($handle) |
82 | =item on_eof => $cb->($handle) |
79 | |
83 | |
80 | Set the callback to be called when an end-of-file condition is detcted, |
84 | Set the callback to be called when an end-of-file condition is detected, |
81 | i.e. in the case of a socket, when the other side has closed the |
85 | i.e. in the case of a socket, when the other side has closed the |
82 | connection cleanly. |
86 | connection cleanly. |
83 | |
87 | |
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88 | For sockets, this just means that the other side has stopped sending data, |
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89 | you can still try to write data, and, in fact, one can return from the eof |
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90 | callback and continue writing data, as only the read part has been shut |
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91 | down. |
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92 | |
84 | While not mandatory, it is highly recommended to set an eof callback, |
93 | While not mandatory, it is I<highly> recommended to set an eof callback, |
85 | otherwise you might end up with a closed socket while you are still |
94 | otherwise you might end up with a closed socket while you are still |
86 | waiting for data. |
95 | waiting for data. |
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96 | |
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97 | If an EOF condition has been detected but no C<on_eof> callback has been |
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98 | set, then a fatal error will be raised with C<$!> set to <0>. |
87 | |
99 | |
88 | =item on_error => $cb->($handle, $fatal) |
100 | =item on_error => $cb->($handle, $fatal) |
89 | |
101 | |
90 | This is the error callback, which is called when, well, some error |
102 | This is the error callback, which is called when, well, some error |
91 | occured, such as not being able to resolve the hostname, failure to |
103 | occured, such as not being able to resolve the hostname, failure to |
92 | connect or a read error. |
104 | connect or a read error. |
93 | |
105 | |
94 | Some errors are fatal (which is indicated by C<$fatal> being true). On |
106 | Some errors are fatal (which is indicated by C<$fatal> being true). On |
95 | fatal errors the handle object will be shut down and will not be |
107 | fatal errors the handle object will be shut down and will not be usable |
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108 | (but you are free to look at the current C< ->rbuf >). Examples of fatal |
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109 | errors are an EOF condition with active (but unsatisifable) read watchers |
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110 | (C<EPIPE>) or I/O errors. |
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111 | |
96 | usable. Non-fatal errors can be retried by simply returning, but it is |
112 | Non-fatal errors can be retried by simply returning, but it is recommended |
97 | recommended to simply ignore this parameter and instead abondon the handle |
113 | to simply ignore this parameter and instead abondon the handle object |
98 | object when this callback is invoked. |
114 | when this callback is invoked. Examples of non-fatal errors are timeouts |
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115 | C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>). |
99 | |
116 | |
100 | On callback entrance, the value of C<$!> contains the operating system |
117 | On callback entrance, the value of C<$!> contains the operating system |
101 | error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>). |
118 | error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>). |
102 | |
119 | |
103 | While not mandatory, it is I<highly> recommended to set this callback, as |
120 | While not mandatory, it is I<highly> recommended to set this callback, as |
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162 | be configured to accept only so-and-so much data that it cannot act on |
179 | be configured to accept only so-and-so much data that it cannot act on |
163 | (for example, when expecting a line, an attacker could send an unlimited |
180 | (for example, when expecting a line, an attacker could send an unlimited |
164 | amount of data without a callback ever being called as long as the line |
181 | amount of data without a callback ever being called as long as the line |
165 | isn't finished). |
182 | isn't finished). |
166 | |
183 | |
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184 | =item autocork => <boolean> |
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185 | |
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186 | When disabled (the default), then C<push_write> will try to immediately |
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187 | write the data to the handle if possible. This avoids having to register |
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188 | a write watcher and wait for the next event loop iteration, but can be |
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189 | inefficient if you write multiple small chunks (this disadvantage is |
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190 | usually avoided by your kernel's nagle algorithm, see C<low_delay>). |
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191 | |
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192 | When enabled, then writes will always be queued till the next event loop |
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193 | iteration. This is efficient when you do many small writes per iteration, |
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194 | but less efficient when you do a single write only. |
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195 | |
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196 | =item no_delay => <boolean> |
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197 | |
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198 | When doing small writes on sockets, your operating system kernel might |
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199 | wait a bit for more data before actually sending it out. This is called |
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200 | the Nagle algorithm, and usually it is beneficial. |
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201 | |
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202 | In some situations you want as low a delay as possible, which cna be |
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203 | accomplishd by setting this option to true. |
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204 | |
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205 | The default is your opertaing system's default behaviour, this option |
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206 | explicitly enables or disables it, if possible. |
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207 | |
167 | =item read_size => <bytes> |
208 | =item read_size => <bytes> |
168 | |
209 | |
169 | The default read block size (the amount of bytes this module will try to read |
210 | The default read block size (the amount of bytes this module will try to read |
170 | during each (loop iteration). Default: C<8192>. |
211 | during each (loop iteration). Default: C<8192>. |
171 | |
212 | |
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201 | You can also provide your own TLS connection object, but you have |
242 | You can also provide your own TLS connection object, but you have |
202 | to make sure that you call either C<Net::SSLeay::set_connect_state> |
243 | to make sure that you call either C<Net::SSLeay::set_connect_state> |
203 | or C<Net::SSLeay::set_accept_state> on it before you pass it to |
244 | or C<Net::SSLeay::set_accept_state> on it before you pass it to |
204 | AnyEvent::Handle. |
245 | AnyEvent::Handle. |
205 | |
246 | |
206 | See the C<starttls> method if you need to start TLs negotiation later. |
247 | See the C<starttls> method if you need to start TLS negotiation later. |
207 | |
248 | |
208 | =item tls_ctx => $ssl_ctx |
249 | =item tls_ctx => $ssl_ctx |
209 | |
250 | |
210 | Use the given Net::SSLeay::CTX object to create the new TLS connection |
251 | Use the given Net::SSLeay::CTX object to create the new TLS connection |
211 | (unless a connection object was specified directly). If this parameter is |
252 | (unless a connection object was specified directly). If this parameter is |
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246 | } |
287 | } |
247 | |
288 | |
248 | $self->{_activity} = AnyEvent->now; |
289 | $self->{_activity} = AnyEvent->now; |
249 | $self->_timeout; |
290 | $self->_timeout; |
250 | |
291 | |
251 | $self->on_drain (delete $self->{on_drain}) if $self->{on_drain}; |
292 | $self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain}; |
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293 | $self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay}; |
252 | |
294 | |
253 | $self->start_read |
295 | $self->start_read |
254 | if $self->{on_read}; |
296 | if $self->{on_read}; |
255 | |
297 | |
256 | $self |
298 | $self |
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263 | delete $self->{_rw}; |
305 | delete $self->{_rw}; |
264 | delete $self->{_ww}; |
306 | delete $self->{_ww}; |
265 | delete $self->{fh}; |
307 | delete $self->{fh}; |
266 | |
308 | |
267 | $self->stoptls; |
309 | $self->stoptls; |
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310 | |
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311 | delete $self->{on_read}; |
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312 | delete $self->{_queue}; |
268 | } |
313 | } |
269 | |
314 | |
270 | sub _error { |
315 | sub _error { |
271 | my ($self, $errno, $fatal) = @_; |
316 | my ($self, $errno, $fatal) = @_; |
272 | |
317 | |
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318 | |
363 | |
319 | =cut |
364 | =cut |
320 | |
365 | |
321 | sub on_timeout { |
366 | sub on_timeout { |
322 | $_[0]{on_timeout} = $_[1]; |
367 | $_[0]{on_timeout} = $_[1]; |
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368 | } |
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369 | |
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370 | =item $handle->autocork ($boolean) |
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371 | |
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372 | Enables or disables the current autocork behaviour (see C<autocork> |
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373 | constructor argument). |
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374 | |
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375 | =cut |
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376 | |
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377 | =item $handle->no_delay ($boolean) |
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378 | |
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379 | Enables or disables the C<no_delay> setting (see constructor argument of |
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380 | the same name for details). |
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381 | |
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382 | =cut |
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383 | |
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384 | sub no_delay { |
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385 | $_[0]{no_delay} = $_[1]; |
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386 | |
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387 | eval { |
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388 | local $SIG{__DIE__}; |
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389 | setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1]; |
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390 | }; |
323 | } |
391 | } |
324 | |
392 | |
325 | ############################################################################# |
393 | ############################################################################# |
326 | |
394 | |
327 | =item $handle->timeout ($seconds) |
395 | =item $handle->timeout ($seconds) |
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442 | $self->_error ($!, 1); |
510 | $self->_error ($!, 1); |
443 | } |
511 | } |
444 | }; |
512 | }; |
445 | |
513 | |
446 | # try to write data immediately |
514 | # try to write data immediately |
447 | $cb->(); |
515 | $cb->() unless $self->{autocork}; |
448 | |
516 | |
449 | # if still data left in wbuf, we need to poll |
517 | # if still data left in wbuf, we need to poll |
450 | $self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb) |
518 | $self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb) |
451 | if length $self->{wbuf}; |
519 | if length $self->{wbuf}; |
452 | }; |
520 | }; |
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678 | |
746 | |
679 | if ( |
747 | if ( |
680 | defined $self->{rbuf_max} |
748 | defined $self->{rbuf_max} |
681 | && $self->{rbuf_max} < length $self->{rbuf} |
749 | && $self->{rbuf_max} < length $self->{rbuf} |
682 | ) { |
750 | ) { |
683 | return $self->_error (&Errno::ENOSPC, 1); |
751 | $self->_error (&Errno::ENOSPC, 1), return; |
684 | } |
752 | } |
685 | |
753 | |
686 | while () { |
754 | while () { |
687 | no strict 'refs'; |
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688 | |
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689 | my $len = length $self->{rbuf}; |
755 | my $len = length $self->{rbuf}; |
690 | |
756 | |
691 | if (my $cb = shift @{ $self->{_queue} }) { |
757 | if (my $cb = shift @{ $self->{_queue} }) { |
692 | unless ($cb->($self)) { |
758 | unless ($cb->($self)) { |
693 | if ($self->{_eof}) { |
759 | if ($self->{_eof}) { |
694 | # no progress can be made (not enough data and no data forthcoming) |
760 | # no progress can be made (not enough data and no data forthcoming) |
695 | $self->_error (&Errno::EPIPE, 1), last; |
761 | $self->_error (&Errno::EPIPE, 1), return; |
696 | } |
762 | } |
697 | |
763 | |
698 | unshift @{ $self->{_queue} }, $cb; |
764 | unshift @{ $self->{_queue} }, $cb; |
699 | last; |
765 | last; |
700 | } |
766 | } |
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708 | && !@{ $self->{_queue} } # and the queue is still empty |
774 | && !@{ $self->{_queue} } # and the queue is still empty |
709 | && $self->{on_read} # but we still have on_read |
775 | && $self->{on_read} # but we still have on_read |
710 | ) { |
776 | ) { |
711 | # no further data will arrive |
777 | # no further data will arrive |
712 | # so no progress can be made |
778 | # so no progress can be made |
713 | $self->_error (&Errno::EPIPE, 1), last |
779 | $self->_error (&Errno::EPIPE, 1), return |
714 | if $self->{_eof}; |
780 | if $self->{_eof}; |
715 | |
781 | |
716 | last; # more data might arrive |
782 | last; # more data might arrive |
717 | } |
783 | } |
718 | } else { |
784 | } else { |
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720 | delete $self->{_rw}; |
786 | delete $self->{_rw}; |
721 | last; |
787 | last; |
722 | } |
788 | } |
723 | } |
789 | } |
724 | |
790 | |
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791 | if ($self->{_eof}) { |
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792 | if ($self->{on_eof}) { |
725 | $self->{on_eof}($self) |
793 | $self->{on_eof}($self) |
726 | if $self->{_eof} && $self->{on_eof}; |
794 | } else { |
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795 | $self->_error (0, 1); |
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796 | } |
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797 | } |
727 | |
798 | |
728 | # may need to restart read watcher |
799 | # may need to restart read watcher |
729 | unless ($self->{_rw}) { |
800 | unless ($self->{_rw}) { |
730 | $self->start_read |
801 | $self->start_read |
731 | if $self->{on_read} || @{ $self->{_queue} }; |
802 | if $self->{on_read} || @{ $self->{_queue} }; |
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857 | $cb->($_[0], substr $_[0]{rbuf}, 0, $len, ""); |
928 | $cb->($_[0], substr $_[0]{rbuf}, 0, $len, ""); |
858 | 1 |
929 | 1 |
859 | } |
930 | } |
860 | }; |
931 | }; |
861 | |
932 | |
862 | # compatibility with older API |
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863 | sub push_read_chunk { |
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864 | $_[0]->push_read (chunk => $_[1], $_[2]); |
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865 | } |
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866 | |
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867 | sub unshift_read_chunk { |
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868 | $_[0]->unshift_read (chunk => $_[1], $_[2]); |
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869 | } |
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870 | |
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871 | =item line => [$eol, ]$cb->($handle, $line, $eol) |
933 | =item line => [$eol, ]$cb->($handle, $line, $eol) |
872 | |
934 | |
873 | The callback will be called only once a full line (including the end of |
935 | The callback will be called only once a full line (including the end of |
874 | line marker, C<$eol>) has been read. This line (excluding the end of line |
936 | line marker, C<$eol>) has been read. This line (excluding the end of line |
875 | marker) will be passed to the callback as second argument (C<$line>), and |
937 | marker) will be passed to the callback as second argument (C<$line>), and |
… | |
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890 | =cut |
952 | =cut |
891 | |
953 | |
892 | register_read_type line => sub { |
954 | register_read_type line => sub { |
893 | my ($self, $cb, $eol) = @_; |
955 | my ($self, $cb, $eol) = @_; |
894 | |
956 | |
895 | $eol = qr|(\015?\012)| if @_ < 3; |
957 | if (@_ < 3) { |
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958 | # this is more than twice as fast as the generic code below |
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959 | sub { |
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960 | $_[0]{rbuf} =~ s/^([^\015\012]*)(\015?\012)// or return; |
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961 | |
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962 | $cb->($_[0], $1, $2); |
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963 | 1 |
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964 | } |
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965 | } else { |
896 | $eol = quotemeta $eol unless ref $eol; |
966 | $eol = quotemeta $eol unless ref $eol; |
897 | $eol = qr|^(.*?)($eol)|s; |
967 | $eol = qr|^(.*?)($eol)|s; |
898 | |
968 | |
899 | sub { |
969 | sub { |
900 | $_[0]{rbuf} =~ s/$eol// or return; |
970 | $_[0]{rbuf} =~ s/$eol// or return; |
901 | |
971 | |
902 | $cb->($_[0], $1, $2); |
972 | $cb->($_[0], $1, $2); |
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973 | 1 |
903 | 1 |
974 | } |
904 | } |
975 | } |
905 | }; |
976 | }; |
906 | |
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907 | # compatibility with older API |
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908 | sub push_read_line { |
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909 | my $self = shift; |
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910 | $self->push_read (line => @_); |
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911 | } |
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912 | |
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913 | sub unshift_read_line { |
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914 | my $self = shift; |
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915 | $self->unshift_read (line => @_); |
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916 | } |
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917 | |
977 | |
918 | =item regex => $accept[, $reject[, $skip], $cb->($handle, $data) |
978 | =item regex => $accept[, $reject[, $skip], $cb->($handle, $data) |
919 | |
979 | |
920 | Makes a regex match against the regex object C<$accept> and returns |
980 | Makes a regex match against the regex object C<$accept> and returns |
921 | everything up to and including the match. |
981 | everything up to and including the match. |
… | |
… | |
1042 | register_read_type packstring => sub { |
1102 | register_read_type packstring => sub { |
1043 | my ($self, $cb, $format) = @_; |
1103 | my ($self, $cb, $format) = @_; |
1044 | |
1104 | |
1045 | sub { |
1105 | sub { |
1046 | # when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method |
1106 | # when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method |
1047 | defined (my $len = eval { unpack $format, $_[0]->{rbuf} }) |
1107 | defined (my $len = eval { unpack $format, $_[0]{rbuf} }) |
1048 | or return; |
1108 | or return; |
1049 | |
1109 | |
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1110 | $format = length pack $format, $len; |
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1111 | |
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1112 | # bypass unshift if we already have the remaining chunk |
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1113 | if ($format + $len <= length $_[0]{rbuf}) { |
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1114 | my $data = substr $_[0]{rbuf}, $format, $len; |
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1115 | substr $_[0]{rbuf}, 0, $format + $len, ""; |
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1116 | $cb->($_[0], $data); |
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1117 | } else { |
1050 | # remove prefix |
1118 | # remove prefix |
1051 | substr $_[0]->{rbuf}, 0, (length pack $format, $len), ""; |
1119 | substr $_[0]{rbuf}, 0, $format, ""; |
1052 | |
1120 | |
1053 | # read rest |
1121 | # read remaining chunk |
1054 | $_[0]->unshift_read (chunk => $len, $cb); |
1122 | $_[0]->unshift_read (chunk => $len, $cb); |
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1123 | } |
1055 | |
1124 | |
1056 | 1 |
1125 | 1 |
1057 | } |
1126 | } |
1058 | }; |
1127 | }; |
1059 | |
1128 | |
… | |
… | |
1116 | |
1185 | |
1117 | require Storable; |
1186 | require Storable; |
1118 | |
1187 | |
1119 | sub { |
1188 | sub { |
1120 | # when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method |
1189 | # when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method |
1121 | defined (my $len = eval { unpack "w", $_[0]->{rbuf} }) |
1190 | defined (my $len = eval { unpack "w", $_[0]{rbuf} }) |
1122 | or return; |
1191 | or return; |
1123 | |
1192 | |
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1193 | my $format = length pack "w", $len; |
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1194 | |
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1195 | # bypass unshift if we already have the remaining chunk |
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1196 | if ($format + $len <= length $_[0]{rbuf}) { |
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1197 | my $data = substr $_[0]{rbuf}, $format, $len; |
|
|
1198 | substr $_[0]{rbuf}, 0, $format + $len, ""; |
|
|
1199 | $cb->($_[0], Storable::thaw ($data)); |
|
|
1200 | } else { |
1124 | # remove prefix |
1201 | # remove prefix |
1125 | substr $_[0]->{rbuf}, 0, (length pack "w", $len), ""; |
1202 | substr $_[0]{rbuf}, 0, $format, ""; |
1126 | |
1203 | |
1127 | # read rest |
1204 | # read remaining chunk |
1128 | $_[0]->unshift_read (chunk => $len, sub { |
1205 | $_[0]->unshift_read (chunk => $len, sub { |
1129 | if (my $ref = eval { Storable::thaw ($_[1]) }) { |
1206 | if (my $ref = eval { Storable::thaw ($_[1]) }) { |
1130 | $cb->($_[0], $ref); |
1207 | $cb->($_[0], $ref); |
1131 | } else { |
1208 | } else { |
1132 | $self->_error (&Errno::EBADMSG); |
1209 | $self->_error (&Errno::EBADMSG); |
|
|
1210 | } |
1133 | } |
1211 | }); |
1134 | }); |
1212 | } |
|
|
1213 | |
|
|
1214 | 1 |
1135 | } |
1215 | } |
1136 | }; |
1216 | }; |
1137 | |
1217 | |
1138 | =back |
1218 | =back |
1139 | |
1219 | |
… | |
… | |
1400 | =over 4 |
1480 | =over 4 |
1401 | |
1481 | |
1402 | =item * all constructor arguments become object members. |
1482 | =item * all constructor arguments become object members. |
1403 | |
1483 | |
1404 | At least initially, when you pass a C<tls>-argument to the constructor it |
1484 | At least initially, when you pass a C<tls>-argument to the constructor it |
1405 | will end up in C<< $handle->{tls} >>. Those members might be changes or |
1485 | will end up in C<< $handle->{tls} >>. Those members might be changed or |
1406 | mutated later on (for example C<tls> will hold the TLS connection object). |
1486 | mutated later on (for example C<tls> will hold the TLS connection object). |
1407 | |
1487 | |
1408 | =item * other object member names are prefixed with an C<_>. |
1488 | =item * other object member names are prefixed with an C<_>. |
1409 | |
1489 | |
1410 | All object members not explicitly documented (internal use) are prefixed |
1490 | All object members not explicitly documented (internal use) are prefixed |