| 1 | package AnyEvent::Handle; |
1 | package AnyEvent::Handle; |
| 2 | |
2 | |
| 3 | no warnings; |
|
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| 4 | use strict qw(subs vars); |
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| 5 | |
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| 6 | use AnyEvent (); |
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| 7 | use AnyEvent::Util qw(WSAEWOULDBLOCK); |
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| 8 | use Scalar::Util (); |
3 | use Scalar::Util (); |
| 9 | use Carp (); |
4 | use Carp (); |
| 10 | use Fcntl (); |
|
|
| 11 | use Errno qw(EAGAIN EINTR); |
5 | use Errno qw(EAGAIN EINTR); |
| 12 | |
6 | |
|
|
7 | use AnyEvent (); BEGIN { AnyEvent::common_sense } |
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|
8 | use AnyEvent::Util qw(WSAEWOULDBLOCK); |
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9 | |
| 13 | =head1 NAME |
10 | =head1 NAME |
| 14 | |
11 | |
| 15 | AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent |
12 | AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent |
| 16 | |
13 | |
| 17 | =cut |
14 | =cut |
| 18 | |
15 | |
| 19 | our $VERSION = 4.452; |
16 | our $VERSION = 4.86; |
| 20 | |
17 | |
| 21 | =head1 SYNOPSIS |
18 | =head1 SYNOPSIS |
| 22 | |
19 | |
| 23 | use AnyEvent; |
20 | use AnyEvent; |
| 24 | use AnyEvent::Handle; |
21 | use AnyEvent::Handle; |
| 25 | |
22 | |
| 26 | my $cv = AnyEvent->condvar; |
23 | my $cv = AnyEvent->condvar; |
| 27 | |
24 | |
| 28 | my $handle = |
25 | my $hdl; $hdl = new AnyEvent::Handle |
| 29 | AnyEvent::Handle->new ( |
|
|
| 30 | fh => \*STDIN, |
26 | fh => \*STDIN, |
| 31 | on_eof => sub { |
27 | on_error => sub { |
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28 | my ($hdl, $fatal, $msg) = @_; |
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29 | warn "got error $msg\n"; |
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30 | $hdl->destroy; |
| 32 | $cv->send; |
31 | $cv->send; |
| 33 | }, |
|
|
| 34 | ); |
32 | ); |
| 35 | |
33 | |
| 36 | # send some request line |
34 | # send some request line |
| 37 | $handle->push_write ("getinfo\015\012"); |
35 | $hdl->push_write ("getinfo\015\012"); |
| 38 | |
36 | |
| 39 | # read the response line |
37 | # read the response line |
| 40 | $handle->push_read (line => sub { |
38 | $hdl->push_read (line => sub { |
| 41 | my ($handle, $line) = @_; |
39 | my ($hdl, $line) = @_; |
| 42 | warn "read line <$line>\n"; |
40 | warn "got line <$line>\n"; |
| 43 | $cv->send; |
41 | $cv->send; |
| 44 | }); |
42 | }); |
| 45 | |
43 | |
| 46 | $cv->recv; |
44 | $cv->recv; |
| 47 | |
45 | |
| … | |
… | |
| 71 | |
69 | |
| 72 | =over 4 |
70 | =over 4 |
| 73 | |
71 | |
| 74 | =item fh => $filehandle [MANDATORY] |
72 | =item fh => $filehandle [MANDATORY] |
| 75 | |
73 | |
|
|
74 | #=item fh => $filehandle [C<fh> or C<connect> MANDATORY] |
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|
75 | |
| 76 | The filehandle this L<AnyEvent::Handle> object will operate on. |
76 | The filehandle this L<AnyEvent::Handle> object will operate on. |
| 77 | |
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| 78 | NOTE: The filehandle will be set to non-blocking mode (using |
77 | NOTE: The filehandle will be set to non-blocking mode (using |
| 79 | C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in |
78 | C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in |
| 80 | that mode. |
79 | that mode. |
| 81 | |
80 | |
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|
81 | #=item connect => [$host, $service] |
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|
82 | # |
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83 | # You have to specify either this parameter, or C<connect>, below. |
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|
84 | #Try to connect to the specified host and service (port), using |
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|
85 | #C<AnyEvent::Socket::tcp_connect>. |
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86 | # |
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|
87 | #When this |
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88 | |
| 82 | =item on_eof => $cb->($handle) |
89 | =item on_eof => $cb->($handle) |
| 83 | |
90 | |
| 84 | Set the callback to be called when an end-of-file condition is detected, |
91 | Set the callback to be called when an end-of-file condition is detected, |
| 85 | i.e. in the case of a socket, when the other side has closed the |
92 | i.e. in the case of a socket, when the other side has closed the |
| 86 | connection cleanly. |
93 | connection cleanly, and there are no outstanding read requests in the |
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94 | queue (if there are read requests, then an EOF counts as an unexpected |
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95 | connection close and will be flagged as an error). |
| 87 | |
96 | |
| 88 | For sockets, this just means that the other side has stopped sending data, |
97 | For sockets, this just means that the other side has stopped sending data, |
| 89 | you can still try to write data, and, in fact, one can return from the EOF |
98 | you can still try to write data, and, in fact, one can return from the EOF |
| 90 | callback and continue writing data, as only the read part has been shut |
99 | callback and continue writing data, as only the read part has been shut |
| 91 | down. |
100 | down. |
| 92 | |
101 | |
| 93 | While not mandatory, it is I<highly> recommended to set an EOF callback, |
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| 94 | otherwise you might end up with a closed socket while you are still |
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| 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 |
102 | If an EOF condition has been detected but no C<on_eof> callback has been |
| 98 | set, then a fatal error will be raised with C<$!> set to <0>. |
103 | set, then a fatal error will be raised with C<$!> set to <0>. |
| 99 | |
104 | |
| 100 | =item on_error => $cb->($handle, $fatal, $message) |
105 | =item on_error => $cb->($handle, $fatal, $message) |
| 101 | |
106 | |
| 102 | This is the error callback, which is called when, well, some error |
107 | This is the error callback, which is called when, well, some error |
| 103 | occured, such as not being able to resolve the hostname, failure to |
108 | occured, such as not being able to resolve the hostname, failure to |
| 104 | connect or a read error. |
109 | connect or a read error. |
| 105 | |
110 | |
| 106 | Some errors are fatal (which is indicated by C<$fatal> being true). On |
111 | Some errors are fatal (which is indicated by C<$fatal> being true). On |
| 107 | fatal errors the handle object will be shut down and will not be usable |
112 | fatal errors the handle object will be destroyed (by a call to C<< -> |
| 108 | (but you are free to look at the current C<< ->rbuf >>). Examples of fatal |
113 | destroy >>) after invoking the error callback (which means you are free to |
| 109 | errors are an EOF condition with active (but unsatisifable) read watchers |
114 | examine the handle object). Examples of fatal errors are an EOF condition |
| 110 | (C<EPIPE>) or I/O errors. |
115 | with active (but unsatisifable) read watchers (C<EPIPE>) or I/O errors. |
| 111 | |
116 | |
| 112 | AnyEvent::Handle tries to find an appropriate error code for you to check |
117 | AnyEvent::Handle tries to find an appropriate error code for you to check |
| 113 | against, but in some cases (TLS errors), this does not work well. It is |
118 | against, but in some cases (TLS errors), this does not work well. It is |
| 114 | recommended to always output the C<$message> argument in human-readable |
119 | recommended to always output the C<$message> argument in human-readable |
| 115 | error messages (it's usually the same as C<"$!">). |
120 | error messages (it's usually the same as C<"$!">). |
| … | |
… | |
| 141 | |
146 | |
| 142 | When an EOF condition is detected then AnyEvent::Handle will first try to |
147 | When an EOF condition is detected then AnyEvent::Handle will first try to |
| 143 | feed all the remaining data to the queued callbacks and C<on_read> before |
148 | feed all the remaining data to the queued callbacks and C<on_read> before |
| 144 | calling the C<on_eof> callback. If no progress can be made, then a fatal |
149 | calling the C<on_eof> callback. If no progress can be made, then a fatal |
| 145 | error will be raised (with C<$!> set to C<EPIPE>). |
150 | error will be raised (with C<$!> set to C<EPIPE>). |
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|
151 | |
|
|
152 | Note that, unlike requests in the read queue, an C<on_read> callback |
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|
153 | doesn't mean you I<require> some data: if there is an EOF and there |
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|
154 | are outstanding read requests then an error will be flagged. With an |
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|
155 | C<on_read> callback, the C<on_eof> callback will be invoked. |
| 146 | |
156 | |
| 147 | =item on_drain => $cb->($handle) |
157 | =item on_drain => $cb->($handle) |
| 148 | |
158 | |
| 149 | This sets the callback that is called when the write buffer becomes empty |
159 | This sets the callback that is called when the write buffer becomes empty |
| 150 | (or when the callback is set and the buffer is empty already). |
160 | (or when the callback is set and the buffer is empty already). |
| … | |
… | |
| 369 | if $self->{on_read}; |
379 | if $self->{on_read}; |
| 370 | |
380 | |
| 371 | $self->{fh} && $self |
381 | $self->{fh} && $self |
| 372 | } |
382 | } |
| 373 | |
383 | |
| 374 | sub _shutdown { |
384 | #sub _shutdown { |
| 375 | my ($self) = @_; |
385 | # my ($self) = @_; |
| 376 | |
386 | # |
| 377 | delete @$self{qw(_tw _rw _ww fh wbuf on_read _queue)}; |
387 | # delete @$self{qw(_tw _rw _ww fh wbuf on_read _queue)}; |
| 378 | $self->{_eof} = 1; # tell starttls et. al to stop trying |
388 | # $self->{_eof} = 1; # tell starttls et. al to stop trying |
| 379 | |
389 | # |
| 380 | &_freetls; |
390 | # &_freetls; |
| 381 | } |
391 | #} |
| 382 | |
392 | |
| 383 | sub _error { |
393 | sub _error { |
| 384 | my ($self, $errno, $fatal, $message) = @_; |
394 | my ($self, $errno, $fatal, $message) = @_; |
| 385 | |
395 | |
| 386 | $self->_shutdown |
|
|
| 387 | if $fatal; |
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|
| 388 | |
|
|
| 389 | $! = $errno; |
396 | $! = $errno; |
| 390 | $message ||= "$!"; |
397 | $message ||= "$!"; |
| 391 | |
398 | |
| 392 | if ($self->{on_error}) { |
399 | if ($self->{on_error}) { |
| 393 | $self->{on_error}($self, $fatal, $message); |
400 | $self->{on_error}($self, $fatal, $message); |
|
|
401 | $self->destroy if $fatal; |
| 394 | } elsif ($self->{fh}) { |
402 | } elsif ($self->{fh}) { |
|
|
403 | $self->destroy; |
| 395 | Carp::croak "AnyEvent::Handle uncaught error: $message"; |
404 | Carp::croak "AnyEvent::Handle uncaught error: $message"; |
| 396 | } |
405 | } |
| 397 | } |
406 | } |
| 398 | |
407 | |
| 399 | =item $fh = $handle->fh |
408 | =item $fh = $handle->fh |
| … | |
… | |
| 514 | $self->{_activity} = $NOW; |
523 | $self->{_activity} = $NOW; |
| 515 | |
524 | |
| 516 | if ($self->{on_timeout}) { |
525 | if ($self->{on_timeout}) { |
| 517 | $self->{on_timeout}($self); |
526 | $self->{on_timeout}($self); |
| 518 | } else { |
527 | } else { |
| 519 | $self->_error (&Errno::ETIMEDOUT); |
528 | $self->_error (Errno::ETIMEDOUT); |
| 520 | } |
529 | } |
| 521 | |
530 | |
| 522 | # callback could have changed timeout value, optimise |
531 | # callback could have changed timeout value, optimise |
| 523 | return unless $self->{timeout}; |
532 | return unless $self->{timeout}; |
| 524 | |
533 | |
| … | |
… | |
| 587 | Scalar::Util::weaken $self; |
596 | Scalar::Util::weaken $self; |
| 588 | |
597 | |
| 589 | my $cb = sub { |
598 | my $cb = sub { |
| 590 | my $len = syswrite $self->{fh}, $self->{wbuf}; |
599 | my $len = syswrite $self->{fh}, $self->{wbuf}; |
| 591 | |
600 | |
| 592 | if ($len >= 0) { |
601 | if (defined $len) { |
| 593 | substr $self->{wbuf}, 0, $len, ""; |
602 | substr $self->{wbuf}, 0, $len, ""; |
| 594 | |
603 | |
| 595 | $self->{_activity} = AnyEvent->now; |
604 | $self->{_activity} = AnyEvent->now; |
| 596 | |
605 | |
| 597 | $self->{on_drain}($self) |
606 | $self->{on_drain}($self) |
| … | |
… | |
| 866 | |
875 | |
| 867 | if ( |
876 | if ( |
| 868 | defined $self->{rbuf_max} |
877 | defined $self->{rbuf_max} |
| 869 | && $self->{rbuf_max} < length $self->{rbuf} |
878 | && $self->{rbuf_max} < length $self->{rbuf} |
| 870 | ) { |
879 | ) { |
| 871 | $self->_error (&Errno::ENOSPC, 1), return; |
880 | $self->_error (Errno::ENOSPC, 1), return; |
| 872 | } |
881 | } |
| 873 | |
882 | |
| 874 | while () { |
883 | while () { |
| 875 | # we need to use a separate tls read buffer, as we must not receive data while |
884 | # we need to use a separate tls read buffer, as we must not receive data while |
| 876 | # we are draining the buffer, and this can only happen with TLS. |
885 | # we are draining the buffer, and this can only happen with TLS. |
| … | |
… | |
| 880 | |
889 | |
| 881 | if (my $cb = shift @{ $self->{_queue} }) { |
890 | if (my $cb = shift @{ $self->{_queue} }) { |
| 882 | unless ($cb->($self)) { |
891 | unless ($cb->($self)) { |
| 883 | if ($self->{_eof}) { |
892 | if ($self->{_eof}) { |
| 884 | # no progress can be made (not enough data and no data forthcoming) |
893 | # no progress can be made (not enough data and no data forthcoming) |
| 885 | $self->_error (&Errno::EPIPE, 1), return; |
894 | $self->_error (Errno::EPIPE, 1), return; |
| 886 | } |
895 | } |
| 887 | |
896 | |
| 888 | unshift @{ $self->{_queue} }, $cb; |
897 | unshift @{ $self->{_queue} }, $cb; |
| 889 | last; |
898 | last; |
| 890 | } |
899 | } |
| … | |
… | |
| 898 | && !@{ $self->{_queue} } # and the queue is still empty |
907 | && !@{ $self->{_queue} } # and the queue is still empty |
| 899 | && $self->{on_read} # but we still have on_read |
908 | && $self->{on_read} # but we still have on_read |
| 900 | ) { |
909 | ) { |
| 901 | # no further data will arrive |
910 | # no further data will arrive |
| 902 | # so no progress can be made |
911 | # so no progress can be made |
| 903 | $self->_error (&Errno::EPIPE, 1), return |
912 | $self->_error (Errno::EPIPE, 1), return |
| 904 | if $self->{_eof}; |
913 | if $self->{_eof}; |
| 905 | |
914 | |
| 906 | last; # more data might arrive |
915 | last; # more data might arrive |
| 907 | } |
916 | } |
| 908 | } else { |
917 | } else { |
| … | |
… | |
| 1158 | return 1; |
1167 | return 1; |
| 1159 | } |
1168 | } |
| 1160 | |
1169 | |
| 1161 | # reject |
1170 | # reject |
| 1162 | if ($reject && $$rbuf =~ $reject) { |
1171 | if ($reject && $$rbuf =~ $reject) { |
| 1163 | $self->_error (&Errno::EBADMSG); |
1172 | $self->_error (Errno::EBADMSG); |
| 1164 | } |
1173 | } |
| 1165 | |
1174 | |
| 1166 | # skip |
1175 | # skip |
| 1167 | if ($skip && $$rbuf =~ $skip) { |
1176 | if ($skip && $$rbuf =~ $skip) { |
| 1168 | $data .= substr $$rbuf, 0, $+[0], ""; |
1177 | $data .= substr $$rbuf, 0, $+[0], ""; |
| … | |
… | |
| 1184 | my ($self, $cb) = @_; |
1193 | my ($self, $cb) = @_; |
| 1185 | |
1194 | |
| 1186 | sub { |
1195 | sub { |
| 1187 | unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) { |
1196 | unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) { |
| 1188 | if ($_[0]{rbuf} =~ /[^0-9]/) { |
1197 | if ($_[0]{rbuf} =~ /[^0-9]/) { |
| 1189 | $self->_error (&Errno::EBADMSG); |
1198 | $self->_error (Errno::EBADMSG); |
| 1190 | } |
1199 | } |
| 1191 | return; |
1200 | return; |
| 1192 | } |
1201 | } |
| 1193 | |
1202 | |
| 1194 | my $len = $1; |
1203 | my $len = $1; |
| … | |
… | |
| 1197 | my $string = $_[1]; |
1206 | my $string = $_[1]; |
| 1198 | $_[0]->unshift_read (chunk => 1, sub { |
1207 | $_[0]->unshift_read (chunk => 1, sub { |
| 1199 | if ($_[1] eq ",") { |
1208 | if ($_[1] eq ",") { |
| 1200 | $cb->($_[0], $string); |
1209 | $cb->($_[0], $string); |
| 1201 | } else { |
1210 | } else { |
| 1202 | $self->_error (&Errno::EBADMSG); |
1211 | $self->_error (Errno::EBADMSG); |
| 1203 | } |
1212 | } |
| 1204 | }); |
1213 | }); |
| 1205 | }); |
1214 | }); |
| 1206 | |
1215 | |
| 1207 | 1 |
1216 | 1 |
| … | |
… | |
| 1297 | $json->incr_skip; |
1306 | $json->incr_skip; |
| 1298 | |
1307 | |
| 1299 | $self->{rbuf} = $json->incr_text; |
1308 | $self->{rbuf} = $json->incr_text; |
| 1300 | $json->incr_text = ""; |
1309 | $json->incr_text = ""; |
| 1301 | |
1310 | |
| 1302 | $self->_error (&Errno::EBADMSG); |
1311 | $self->_error (Errno::EBADMSG); |
| 1303 | |
1312 | |
| 1304 | () |
1313 | () |
| 1305 | } else { |
1314 | } else { |
| 1306 | $self->{rbuf} = ""; |
1315 | $self->{rbuf} = ""; |
| 1307 | |
1316 | |
| … | |
… | |
| 1344 | # read remaining chunk |
1353 | # read remaining chunk |
| 1345 | $_[0]->unshift_read (chunk => $len, sub { |
1354 | $_[0]->unshift_read (chunk => $len, sub { |
| 1346 | if (my $ref = eval { Storable::thaw ($_[1]) }) { |
1355 | if (my $ref = eval { Storable::thaw ($_[1]) }) { |
| 1347 | $cb->($_[0], $ref); |
1356 | $cb->($_[0], $ref); |
| 1348 | } else { |
1357 | } else { |
| 1349 | $self->_error (&Errno::EBADMSG); |
1358 | $self->_error (Errno::EBADMSG); |
| 1350 | } |
1359 | } |
| 1351 | }); |
1360 | }); |
| 1352 | } |
1361 | } |
| 1353 | |
1362 | |
| 1354 | 1 |
1363 | 1 |
| … | |
… | |
| 1452 | if ($self->{_on_starttls}) { |
1461 | if ($self->{_on_starttls}) { |
| 1453 | (delete $self->{_on_starttls})->($self, undef, $err); |
1462 | (delete $self->{_on_starttls})->($self, undef, $err); |
| 1454 | &_freetls; |
1463 | &_freetls; |
| 1455 | } else { |
1464 | } else { |
| 1456 | &_freetls; |
1465 | &_freetls; |
| 1457 | $self->_error (&Errno::EPROTO, 1, $err); |
1466 | $self->_error (Errno::EPROTO, 1, $err); |
| 1458 | } |
1467 | } |
| 1459 | } |
1468 | } |
| 1460 | |
1469 | |
| 1461 | # poll the write BIO and send the data if applicable |
1470 | # poll the write BIO and send the data if applicable |
| 1462 | # also decode read data if possible |
1471 | # also decode read data if possible |
| … | |
… | |
| 1519 | |
1528 | |
| 1520 | Instead of starting TLS negotiation immediately when the AnyEvent::Handle |
1529 | Instead of starting TLS negotiation immediately when the AnyEvent::Handle |
| 1521 | object is created, you can also do that at a later time by calling |
1530 | object is created, you can also do that at a later time by calling |
| 1522 | C<starttls>. |
1531 | C<starttls>. |
| 1523 | |
1532 | |
|
|
1533 | Starting TLS is currently an asynchronous operation - when you push some |
|
|
1534 | write data and then call C<< ->starttls >> then TLS negotiation will start |
|
|
1535 | immediately, after which the queued write data is then sent. |
|
|
1536 | |
| 1524 | The first argument is the same as the C<tls> constructor argument (either |
1537 | The first argument is the same as the C<tls> constructor argument (either |
| 1525 | C<"connect">, C<"accept"> or an existing Net::SSLeay object). |
1538 | C<"connect">, C<"accept"> or an existing Net::SSLeay object). |
| 1526 | |
1539 | |
| 1527 | The second argument is the optional C<AnyEvent::TLS> object that is used |
1540 | The second argument is the optional C<AnyEvent::TLS> object that is used |
| 1528 | when AnyEvent::Handle has to create its own TLS connection object, or |
1541 | when AnyEvent::Handle has to create its own TLS connection object, or |
| … | |
… | |
| 1552 | $ERROR_SYSCALL = Net::SSLeay::ERROR_SYSCALL (); |
1565 | $ERROR_SYSCALL = Net::SSLeay::ERROR_SYSCALL (); |
| 1553 | $ERROR_WANT_READ = Net::SSLeay::ERROR_WANT_READ (); |
1566 | $ERROR_WANT_READ = Net::SSLeay::ERROR_WANT_READ (); |
| 1554 | |
1567 | |
| 1555 | $ctx ||= $self->{tls_ctx}; |
1568 | $ctx ||= $self->{tls_ctx}; |
| 1556 | |
1569 | |
|
|
1570 | local $Carp::CarpLevel = 1; # skip ourselves when creating a new context or session |
|
|
1571 | |
| 1557 | if ("HASH" eq ref $ctx) { |
1572 | if ("HASH" eq ref $ctx) { |
| 1558 | require AnyEvent::TLS; |
1573 | require AnyEvent::TLS; |
| 1559 | |
|
|
| 1560 | local $Carp::CarpLevel = 1; # skip ourselves when creating a new context |
|
|
| 1561 | |
1574 | |
| 1562 | if ($ctx->{cache}) { |
1575 | if ($ctx->{cache}) { |
| 1563 | my $key = $ctx+0; |
1576 | my $key = $ctx+0; |
| 1564 | $ctx = $TLS_CACHE{$key} ||= new AnyEvent::TLS %$ctx; |
1577 | $ctx = $TLS_CACHE{$key} ||= new AnyEvent::TLS %$ctx; |
| 1565 | } else { |
1578 | } else { |
| … | |
… | |
| 1637 | |
1650 | |
| 1638 | &_freetls; |
1651 | &_freetls; |
| 1639 | |
1652 | |
| 1640 | my $linger = exists $self->{linger} ? $self->{linger} : 3600; |
1653 | my $linger = exists $self->{linger} ? $self->{linger} : 3600; |
| 1641 | |
1654 | |
| 1642 | if ($linger && length $self->{wbuf}) { |
1655 | if ($linger && length $self->{wbuf} && $self->{fh}) { |
| 1643 | my $fh = delete $self->{fh}; |
1656 | my $fh = delete $self->{fh}; |
| 1644 | my $wbuf = delete $self->{wbuf}; |
1657 | my $wbuf = delete $self->{wbuf}; |
| 1645 | |
1658 | |
| 1646 | my @linger; |
1659 | my @linger; |
| 1647 | |
1660 | |
| … | |
… | |
| 1671 | callbacks, as well as code outside. It does I<NOT> work in a read or write |
1684 | callbacks, as well as code outside. It does I<NOT> work in a read or write |
| 1672 | callback, so when you want to destroy the AnyEvent::Handle object from |
1685 | callback, so when you want to destroy the AnyEvent::Handle object from |
| 1673 | within such an callback. You I<MUST> call C<< ->destroy >> explicitly in |
1686 | within such an callback. You I<MUST> call C<< ->destroy >> explicitly in |
| 1674 | that case. |
1687 | that case. |
| 1675 | |
1688 | |
|
|
1689 | Destroying the handle object in this way has the advantage that callbacks |
|
|
1690 | will be removed as well, so if those are the only reference holders (as |
|
|
1691 | is common), then one doesn't need to do anything special to break any |
|
|
1692 | reference cycles. |
|
|
1693 | |
| 1676 | The handle might still linger in the background and write out remaining |
1694 | The handle might still linger in the background and write out remaining |
| 1677 | data, as specified by the C<linger> option, however. |
1695 | data, as specified by the C<linger> option, however. |
| 1678 | |
1696 | |
| 1679 | =cut |
1697 | =cut |
| 1680 | |
1698 | |
| … | |
… | |
| 1747 | |
1765 | |
| 1748 | $handle->on_read (sub { }); |
1766 | $handle->on_read (sub { }); |
| 1749 | $handle->on_eof (undef); |
1767 | $handle->on_eof (undef); |
| 1750 | $handle->on_error (sub { |
1768 | $handle->on_error (sub { |
| 1751 | my $data = delete $_[0]{rbuf}; |
1769 | my $data = delete $_[0]{rbuf}; |
| 1752 | undef $handle; |
|
|
| 1753 | }); |
1770 | }); |
| 1754 | |
1771 | |
| 1755 | The reason to use C<on_error> is that TCP connections, due to latencies |
1772 | The reason to use C<on_error> is that TCP connections, due to latencies |
| 1756 | and packets loss, might get closed quite violently with an error, when in |
1773 | and packets loss, might get closed quite violently with an error, when in |
| 1757 | fact, all data has been received. |
1774 | fact, all data has been received. |
