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 = 4.14; |
19 | our $VERSION = 4.22; |
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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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 => $cb->($handle) |
78 | =item on_eof => $cb->($handle) |
79 | |
79 | |
80 | Set the callback to be called when an end-of-file condition is detcted, |
80 | 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 |
81 | i.e. in the case of a socket, when the other side has closed the |
82 | connection cleanly. |
82 | connection cleanly. |
83 | |
83 | |
84 | While not mandatory, it is highly recommended to set an eof callback, |
84 | 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 |
85 | otherwise you might end up with a closed socket while you are still |
86 | waiting for data. |
86 | waiting for data. |
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87 | |
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88 | If an EOF condition has been detected but no C<on_eof> callback has been |
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89 | set, then a fatal error will be raised with C<$!> set to <0>. |
87 | |
90 | |
88 | =item on_error => $cb->($handle, $fatal) |
91 | =item on_error => $cb->($handle, $fatal) |
89 | |
92 | |
90 | This is the error callback, which is called when, well, some error |
93 | 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 |
94 | occured, such as not being able to resolve the hostname, failure to |
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124 | This sets the callback that is called when the write buffer becomes empty |
127 | This sets the callback that is called when the write buffer becomes empty |
125 | (or when the callback is set and the buffer is empty already). |
128 | (or when the callback is set and the buffer is empty already). |
126 | |
129 | |
127 | To append to the write buffer, use the C<< ->push_write >> method. |
130 | To append to the write buffer, use the C<< ->push_write >> method. |
128 | |
131 | |
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132 | This callback is useful when you don't want to put all of your write data |
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133 | into the queue at once, for example, when you want to write the contents |
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134 | of some file to the socket you might not want to read the whole file into |
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135 | memory and push it into the queue, but instead only read more data from |
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136 | the file when the write queue becomes empty. |
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137 | |
129 | =item timeout => $fractional_seconds |
138 | =item timeout => $fractional_seconds |
130 | |
139 | |
131 | If non-zero, then this enables an "inactivity" timeout: whenever this many |
140 | If non-zero, then this enables an "inactivity" timeout: whenever this many |
132 | seconds pass without a successful read or write on the underlying file |
141 | seconds pass without a successful read or write on the underlying file |
133 | handle, the C<on_timeout> callback will be invoked (and if that one is |
142 | handle, the C<on_timeout> callback will be invoked (and if that one is |
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156 | be configured to accept only so-and-so much data that it cannot act on |
165 | be configured to accept only so-and-so much data that it cannot act on |
157 | (for example, when expecting a line, an attacker could send an unlimited |
166 | (for example, when expecting a line, an attacker could send an unlimited |
158 | amount of data without a callback ever being called as long as the line |
167 | amount of data without a callback ever being called as long as the line |
159 | isn't finished). |
168 | isn't finished). |
160 | |
169 | |
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170 | =item autocork => <boolean> |
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171 | |
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172 | When disabled (the default), then C<push_write> will try to immediately |
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173 | write the data to the handle if possible. This avoids having to register |
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174 | a write watcher and wait for the next event loop iteration, but can be |
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175 | inefficient if you write multiple small chunks (this disadvantage is |
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176 | usually avoided by your kernel's nagle algorithm, see C<low_delay>). |
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177 | |
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178 | When enabled, then writes will always be queued till the next event loop |
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179 | iteration. This is efficient when you do many small writes per iteration, |
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180 | but less efficient when you do a single write only. |
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181 | |
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182 | =item no_delay => <boolean> |
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183 | |
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184 | When doing small writes on sockets, your operating system kernel might |
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185 | wait a bit for more data before actually sending it out. This is called |
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186 | the Nagle algorithm, and usually it is beneficial. |
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187 | |
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188 | In some situations you want as low a delay as possible, which cna be |
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189 | accomplishd by setting this option to true. |
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190 | |
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191 | The default is your opertaing system's default behaviour, this option |
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192 | explicitly enables or disables it, if possible. |
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193 | |
161 | =item read_size => <bytes> |
194 | =item read_size => <bytes> |
162 | |
195 | |
163 | The default read block size (the amount of bytes this module will try to read |
196 | The default read block size (the amount of bytes this module will try to read |
164 | during each (loop iteration). Default: C<8192>. |
197 | during each (loop iteration). Default: C<8192>. |
165 | |
198 | |
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195 | You can also provide your own TLS connection object, but you have |
228 | You can also provide your own TLS connection object, but you have |
196 | to make sure that you call either C<Net::SSLeay::set_connect_state> |
229 | to make sure that you call either C<Net::SSLeay::set_connect_state> |
197 | or C<Net::SSLeay::set_accept_state> on it before you pass it to |
230 | or C<Net::SSLeay::set_accept_state> on it before you pass it to |
198 | AnyEvent::Handle. |
231 | AnyEvent::Handle. |
199 | |
232 | |
200 | See the C<starttls> method if you need to start TLs negotiation later. |
233 | See the C<starttls> method if you need to start TLS negotiation later. |
201 | |
234 | |
202 | =item tls_ctx => $ssl_ctx |
235 | =item tls_ctx => $ssl_ctx |
203 | |
236 | |
204 | Use the given Net::SSLeay::CTX object to create the new TLS connection |
237 | Use the given Net::SSLeay::CTX object to create the new TLS connection |
205 | (unless a connection object was specified directly). If this parameter is |
238 | (unless a connection object was specified directly). If this parameter is |
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240 | } |
273 | } |
241 | |
274 | |
242 | $self->{_activity} = AnyEvent->now; |
275 | $self->{_activity} = AnyEvent->now; |
243 | $self->_timeout; |
276 | $self->_timeout; |
244 | |
277 | |
245 | $self->on_drain (delete $self->{on_drain}) if $self->{on_drain}; |
278 | $self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain}; |
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279 | $self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay}; |
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280 | |
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281 | $self->start_read |
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282 | if $self->{on_read}; |
246 | |
283 | |
247 | $self |
284 | $self |
248 | } |
285 | } |
249 | |
286 | |
250 | sub _shutdown { |
287 | sub _shutdown { |
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309 | |
346 | |
310 | =cut |
347 | =cut |
311 | |
348 | |
312 | sub on_timeout { |
349 | sub on_timeout { |
313 | $_[0]{on_timeout} = $_[1]; |
350 | $_[0]{on_timeout} = $_[1]; |
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351 | } |
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352 | |
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353 | =item $handle->autocork ($boolean) |
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354 | |
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355 | Enables or disables the current autocork behaviour (see C<autocork> |
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356 | constructor argument). |
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357 | |
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358 | =cut |
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359 | |
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360 | =item $handle->no_delay ($boolean) |
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361 | |
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362 | Enables or disables the C<no_delay> setting (see constructor argument of |
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363 | the same name for details). |
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364 | |
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365 | =cut |
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366 | |
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367 | sub no_delay { |
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368 | $_[0]{no_delay} = $_[1]; |
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369 | |
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370 | eval { |
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371 | local $SIG{__DIE__}; |
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372 | setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1]; |
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373 | }; |
314 | } |
374 | } |
315 | |
375 | |
316 | ############################################################################# |
376 | ############################################################################# |
317 | |
377 | |
318 | =item $handle->timeout ($seconds) |
378 | =item $handle->timeout ($seconds) |
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433 | $self->_error ($!, 1); |
493 | $self->_error ($!, 1); |
434 | } |
494 | } |
435 | }; |
495 | }; |
436 | |
496 | |
437 | # try to write data immediately |
497 | # try to write data immediately |
438 | $cb->(); |
498 | $cb->() unless $self->{autocork}; |
439 | |
499 | |
440 | # if still data left in wbuf, we need to poll |
500 | # if still data left in wbuf, we need to poll |
441 | $self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb) |
501 | $self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb) |
442 | if length $self->{wbuf}; |
502 | if length $self->{wbuf}; |
443 | }; |
503 | }; |
… | |
… | |
500 | =cut |
560 | =cut |
501 | |
561 | |
502 | register_write_type packstring => sub { |
562 | register_write_type packstring => sub { |
503 | my ($self, $format, $string) = @_; |
563 | my ($self, $format, $string) = @_; |
504 | |
564 | |
505 | pack "$format/a", $string |
565 | pack "$format/a*", $string |
506 | }; |
566 | }; |
507 | |
567 | |
508 | =item json => $array_or_hashref |
568 | =item json => $array_or_hashref |
509 | |
569 | |
510 | Encodes the given hash or array reference into a JSON object. Unless you |
570 | Encodes the given hash or array reference into a JSON object. Unless you |
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556 | register_write_type storable => sub { |
616 | register_write_type storable => sub { |
557 | my ($self, $ref) = @_; |
617 | my ($self, $ref) = @_; |
558 | |
618 | |
559 | require Storable; |
619 | require Storable; |
560 | |
620 | |
561 | pack "w/a", Storable::nfreeze ($ref) |
621 | pack "w/a*", Storable::nfreeze ($ref) |
562 | }; |
622 | }; |
563 | |
623 | |
564 | =back |
624 | =back |
565 | |
625 | |
566 | =item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args) |
626 | =item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args) |
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590 | ways, the "simple" way, using only C<on_read> and the "complex" way, using |
650 | ways, the "simple" way, using only C<on_read> and the "complex" way, using |
591 | a queue. |
651 | a queue. |
592 | |
652 | |
593 | In the simple case, you just install an C<on_read> callback and whenever |
653 | In the simple case, you just install an C<on_read> callback and whenever |
594 | new data arrives, it will be called. You can then remove some data (if |
654 | new data arrives, it will be called. You can then remove some data (if |
595 | enough is there) from the read buffer (C<< $handle->rbuf >>) if you want |
655 | enough is there) from the read buffer (C<< $handle->rbuf >>). Or you cna |
596 | or not. |
656 | leave the data there if you want to accumulate more (e.g. when only a |
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657 | partial message has been received so far). |
597 | |
658 | |
598 | In the more complex case, you want to queue multiple callbacks. In this |
659 | In the more complex case, you want to queue multiple callbacks. In this |
599 | case, AnyEvent::Handle will call the first queued callback each time new |
660 | case, AnyEvent::Handle will call the first queued callback each time new |
600 | data arrives (also the first time it is queued) and removes it when it has |
661 | data arrives (also the first time it is queued) and removes it when it has |
601 | done its job (see C<push_read>, below). |
662 | done its job (see C<push_read>, below). |
… | |
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619 | # handle xml |
680 | # handle xml |
620 | }); |
681 | }); |
621 | }); |
682 | }); |
622 | }); |
683 | }); |
623 | |
684 | |
624 | Example 2: Implement a client for a protocol that replies either with |
685 | Example 2: Implement a client for a protocol that replies either with "OK" |
625 | "OK" and another line or "ERROR" for one request, and 64 bytes for the |
686 | and another line or "ERROR" for the first request that is sent, and 64 |
626 | second request. Due tot he availability of a full queue, we can just |
687 | bytes for the second request. Due to the availability of a queue, we can |
627 | pipeline sending both requests and manipulate the queue as necessary in |
688 | just pipeline sending both requests and manipulate the queue as necessary |
628 | the callbacks: |
689 | in the callbacks. |
629 | |
690 | |
630 | # request one |
691 | When the first callback is called and sees an "OK" response, it will |
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692 | C<unshift> another line-read. This line-read will be queued I<before> the |
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693 | 64-byte chunk callback. |
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694 | |
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695 | # request one, returns either "OK + extra line" or "ERROR" |
631 | $handle->push_write ("request 1\015\012"); |
696 | $handle->push_write ("request 1\015\012"); |
632 | |
697 | |
633 | # we expect "ERROR" or "OK" as response, so push a line read |
698 | # we expect "ERROR" or "OK" as response, so push a line read |
634 | $handle->push_read (line => sub { |
699 | $handle->push_read (line => sub { |
635 | # if we got an "OK", we have to _prepend_ another line, |
700 | # if we got an "OK", we have to _prepend_ another line, |
… | |
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642 | ... |
707 | ... |
643 | }); |
708 | }); |
644 | } |
709 | } |
645 | }); |
710 | }); |
646 | |
711 | |
647 | # request two |
712 | # request two, simply returns 64 octets |
648 | $handle->push_write ("request 2\015\012"); |
713 | $handle->push_write ("request 2\015\012"); |
649 | |
714 | |
650 | # simply read 64 bytes, always |
715 | # simply read 64 bytes, always |
651 | $handle->push_read (chunk => 64, sub { |
716 | $handle->push_read (chunk => 64, sub { |
652 | my $response = $_[1]; |
717 | my $response = $_[1]; |
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668 | ) { |
733 | ) { |
669 | return $self->_error (&Errno::ENOSPC, 1); |
734 | return $self->_error (&Errno::ENOSPC, 1); |
670 | } |
735 | } |
671 | |
736 | |
672 | while () { |
737 | while () { |
673 | no strict 'refs'; |
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674 | |
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675 | my $len = length $self->{rbuf}; |
738 | my $len = length $self->{rbuf}; |
676 | |
739 | |
677 | if (my $cb = shift @{ $self->{_queue} }) { |
740 | if (my $cb = shift @{ $self->{_queue} }) { |
678 | unless ($cb->($self)) { |
741 | unless ($cb->($self)) { |
679 | if ($self->{_eof}) { |
742 | if ($self->{_eof}) { |
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706 | delete $self->{_rw}; |
769 | delete $self->{_rw}; |
707 | last; |
770 | last; |
708 | } |
771 | } |
709 | } |
772 | } |
710 | |
773 | |
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774 | if ($self->{_eof}) { |
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775 | if ($self->{on_eof}) { |
711 | $self->{on_eof}($self) |
776 | $self->{on_eof}($self) |
712 | if $self->{_eof} && $self->{on_eof}; |
777 | } else { |
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778 | $self->_error (0, 1); |
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779 | } |
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780 | } |
713 | |
781 | |
714 | # may need to restart read watcher |
782 | # may need to restart read watcher |
715 | unless ($self->{_rw}) { |
783 | unless ($self->{_rw}) { |
716 | $self->start_read |
784 | $self->start_read |
717 | if $self->{on_read} || @{ $self->{_queue} }; |
785 | if $self->{on_read} || @{ $self->{_queue} }; |
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843 | $cb->($_[0], substr $_[0]{rbuf}, 0, $len, ""); |
911 | $cb->($_[0], substr $_[0]{rbuf}, 0, $len, ""); |
844 | 1 |
912 | 1 |
845 | } |
913 | } |
846 | }; |
914 | }; |
847 | |
915 | |
848 | # compatibility with older API |
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849 | sub push_read_chunk { |
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850 | $_[0]->push_read (chunk => $_[1], $_[2]); |
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851 | } |
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852 | |
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853 | sub unshift_read_chunk { |
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854 | $_[0]->unshift_read (chunk => $_[1], $_[2]); |
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855 | } |
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856 | |
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857 | =item line => [$eol, ]$cb->($handle, $line, $eol) |
916 | =item line => [$eol, ]$cb->($handle, $line, $eol) |
858 | |
917 | |
859 | The callback will be called only once a full line (including the end of |
918 | The callback will be called only once a full line (including the end of |
860 | line marker, C<$eol>) has been read. This line (excluding the end of line |
919 | line marker, C<$eol>) has been read. This line (excluding the end of line |
861 | marker) will be passed to the callback as second argument (C<$line>), and |
920 | marker) will be passed to the callback as second argument (C<$line>), and |
… | |
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876 | =cut |
935 | =cut |
877 | |
936 | |
878 | register_read_type line => sub { |
937 | register_read_type line => sub { |
879 | my ($self, $cb, $eol) = @_; |
938 | my ($self, $cb, $eol) = @_; |
880 | |
939 | |
881 | $eol = qr|(\015?\012)| if @_ < 3; |
940 | if (@_ < 3) { |
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941 | # this is more than twice as fast as the generic code below |
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942 | sub { |
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943 | $_[0]{rbuf} =~ s/^([^\015\012]*)(\015?\012)// or return; |
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944 | |
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945 | $cb->($_[0], $1, $2); |
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946 | 1 |
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947 | } |
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948 | } else { |
882 | $eol = quotemeta $eol unless ref $eol; |
949 | $eol = quotemeta $eol unless ref $eol; |
883 | $eol = qr|^(.*?)($eol)|s; |
950 | $eol = qr|^(.*?)($eol)|s; |
884 | |
951 | |
885 | sub { |
952 | sub { |
886 | $_[0]{rbuf} =~ s/$eol// or return; |
953 | $_[0]{rbuf} =~ s/$eol// or return; |
887 | |
954 | |
888 | $cb->($_[0], $1, $2); |
955 | $cb->($_[0], $1, $2); |
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956 | 1 |
889 | 1 |
957 | } |
890 | } |
958 | } |
891 | }; |
959 | }; |
892 | |
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893 | # compatibility with older API |
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894 | sub push_read_line { |
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895 | my $self = shift; |
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896 | $self->push_read (line => @_); |
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897 | } |
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898 | |
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899 | sub unshift_read_line { |
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900 | my $self = shift; |
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901 | $self->unshift_read (line => @_); |
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902 | } |
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903 | |
960 | |
904 | =item regex => $accept[, $reject[, $skip], $cb->($handle, $data) |
961 | =item regex => $accept[, $reject[, $skip], $cb->($handle, $data) |
905 | |
962 | |
906 | Makes a regex match against the regex object C<$accept> and returns |
963 | Makes a regex match against the regex object C<$accept> and returns |
907 | everything up to and including the match. |
964 | everything up to and including the match. |
… | |
… | |
1028 | register_read_type packstring => sub { |
1085 | register_read_type packstring => sub { |
1029 | my ($self, $cb, $format) = @_; |
1086 | my ($self, $cb, $format) = @_; |
1030 | |
1087 | |
1031 | sub { |
1088 | sub { |
1032 | # when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method |
1089 | # when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method |
1033 | defined (my $len = eval { unpack $format, $_[0]->{rbuf} }) |
1090 | defined (my $len = eval { unpack $format, $_[0]{rbuf} }) |
1034 | or return; |
1091 | or return; |
1035 | |
1092 | |
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1093 | $format = length pack $format, $len; |
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1094 | |
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1095 | # bypass unshift if we already have the remaining chunk |
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1096 | if ($format + $len <= length $_[0]{rbuf}) { |
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1097 | my $data = substr $_[0]{rbuf}, $format, $len; |
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1098 | substr $_[0]{rbuf}, 0, $format + $len, ""; |
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1099 | $cb->($_[0], $data); |
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1100 | } else { |
1036 | # remove prefix |
1101 | # remove prefix |
1037 | substr $_[0]->{rbuf}, 0, (length pack $format, $len), ""; |
1102 | substr $_[0]{rbuf}, 0, $format, ""; |
1038 | |
1103 | |
1039 | # read rest |
1104 | # read remaining chunk |
1040 | $_[0]->unshift_read (chunk => $len, $cb); |
1105 | $_[0]->unshift_read (chunk => $len, $cb); |
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1106 | } |
1041 | |
1107 | |
1042 | 1 |
1108 | 1 |
1043 | } |
1109 | } |
1044 | }; |
1110 | }; |
1045 | |
1111 | |
… | |
… | |
1102 | |
1168 | |
1103 | require Storable; |
1169 | require Storable; |
1104 | |
1170 | |
1105 | sub { |
1171 | sub { |
1106 | # when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method |
1172 | # when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method |
1107 | defined (my $len = eval { unpack "w", $_[0]->{rbuf} }) |
1173 | defined (my $len = eval { unpack "w", $_[0]{rbuf} }) |
1108 | or return; |
1174 | or return; |
1109 | |
1175 | |
|
|
1176 | my $format = length pack "w", $len; |
|
|
1177 | |
|
|
1178 | # bypass unshift if we already have the remaining chunk |
|
|
1179 | if ($format + $len <= length $_[0]{rbuf}) { |
|
|
1180 | my $data = substr $_[0]{rbuf}, $format, $len; |
|
|
1181 | substr $_[0]{rbuf}, 0, $format + $len, ""; |
|
|
1182 | $cb->($_[0], Storable::thaw ($data)); |
|
|
1183 | } else { |
1110 | # remove prefix |
1184 | # remove prefix |
1111 | substr $_[0]->{rbuf}, 0, (length pack "w", $len), ""; |
1185 | substr $_[0]{rbuf}, 0, $format, ""; |
1112 | |
1186 | |
1113 | # read rest |
1187 | # read remaining chunk |
1114 | $_[0]->unshift_read (chunk => $len, sub { |
1188 | $_[0]->unshift_read (chunk => $len, sub { |
1115 | if (my $ref = eval { Storable::thaw ($_[1]) }) { |
1189 | if (my $ref = eval { Storable::thaw ($_[1]) }) { |
1116 | $cb->($_[0], $ref); |
1190 | $cb->($_[0], $ref); |
1117 | } else { |
1191 | } else { |
1118 | $self->_error (&Errno::EBADMSG); |
1192 | $self->_error (&Errno::EBADMSG); |
|
|
1193 | } |
1119 | } |
1194 | }); |
1120 | }); |
1195 | } |
|
|
1196 | |
|
|
1197 | 1 |
1121 | } |
1198 | } |
1122 | }; |
1199 | }; |
1123 | |
1200 | |
1124 | =back |
1201 | =back |
1125 | |
1202 | |
… | |
… | |
1386 | =over 4 |
1463 | =over 4 |
1387 | |
1464 | |
1388 | =item * all constructor arguments become object members. |
1465 | =item * all constructor arguments become object members. |
1389 | |
1466 | |
1390 | At least initially, when you pass a C<tls>-argument to the constructor it |
1467 | At least initially, when you pass a C<tls>-argument to the constructor it |
1391 | will end up in C<< $handle->{tls} >>. Those members might be changes or |
1468 | will end up in C<< $handle->{tls} >>. Those members might be changed or |
1392 | mutated later on (for example C<tls> will hold the TLS connection object). |
1469 | mutated later on (for example C<tls> will hold the TLS connection object). |
1393 | |
1470 | |
1394 | =item * other object member names are prefixed with an C<_>. |
1471 | =item * other object member names are prefixed with an C<_>. |
1395 | |
1472 | |
1396 | All object members not explicitly documented (internal use) are prefixed |
1473 | All object members not explicitly documented (internal use) are prefixed |