[ViewVC] Diff of: cvs/AnyEvent/lib/AnyEvent/Handle.pm

Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.36 by root, Mon May 26 18:26:52 2008 UTC vs.
Revision 1.53 by root, Mon Jun 2 09:12:14 2008 UTC

…		…
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
17	=cut	17	=cut
18		18
19	our $VERSION = '0.04';	19	our $VERSION = 4.1;
20		20
21	=head1 SYNOPSIS	21	=head1 SYNOPSIS
22		22
23	use AnyEvent;	23	use AnyEvent;
24	use AnyEvent::Handle;	24	use AnyEvent::Handle;
…		…
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 when an end-of-file condition is detcted,
		81	i.e. in the case of a socket, when the other side has closed the
		82	connection cleanly.
81		83
82	While not mandatory, it is highly recommended to set an eof callback,	84	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	85	otherwise you might end up with a closed socket while you are still
84	waiting for data.	86	waiting for data.
85		87
86	=item on_error => $cb->($self)	88	=item on_error => $cb->($handle, $fatal)
87		89
88	This is the fatal error callback, that is called when, well, a fatal error	90	This is the error callback, which is called when, well, some error
89	occurs, such as not being able to resolve the hostname, failure to connect	91	occured, such as not being able to resolve the hostname, failure to
90	or a read error.	92	connect or a read error.
91		93
92	The object will not be in a usable state when this callback has been	94	Some errors are fatal (which is indicated by C<$fatal> being true). On
93	called.	95	fatal errors the handle object will be shut down and will not be
		96	usable. Non-fatal errors can be retried by simply returning, but it is
		97	recommended to simply ignore this parameter and instead abondon the handle
		98	object when this callback is invoked.
94		99
95	On callback entrance, the value of C<$!> contains the operating system	100	On callback entrance, the value of C<$!> contains the operating system
96	error (or C<ENOSPC>, C<EPIPE> or C<EBADMSG>).	101	error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>).
97		102
98	While not mandatory, it is I<highly> recommended to set this callback, as	103	While not mandatory, it is I<highly> recommended to set this callback, as
99	you will not be notified of errors otherwise. The default simply calls	104	you will not be notified of errors otherwise. The default simply calls
100	die.	105	C<croak>.
101		106
102	=item on_read => $cb->($self)	107	=item on_read => $cb->($handle)
103		108
104	This sets the default read callback, which is called when data arrives	109	This sets the default read callback, which is called when data arrives
105	and no read request is in the queue.	110	and no read request is in the queue.
106		111
107	To access (and remove data from) the read buffer, use the C<< ->rbuf >>	112	To access (and remove data from) the read buffer, use the C<< ->rbuf >>
108	method or access the C<$self->{rbuf}> member directly.	113	method or access the C<$handle->{rbuf}> member directly.
109		114
110	When an EOF condition is detected then AnyEvent::Handle will first try to	115	When an EOF condition is detected then AnyEvent::Handle will first try to
111	feed all the remaining data to the queued callbacks and C<on_read> before	116	feed all the remaining data to the queued callbacks and C<on_read> before
112	calling the C<on_eof> callback. If no progress can be made, then a fatal	117	calling the C<on_eof> callback. If no progress can be made, then a fatal
113	error will be raised (with C<$!> set to C<EPIPE>).	118	error will be raised (with C<$!> set to C<EPIPE>).
114		119
115	=item on_drain => $cb->()	120	=item on_drain => $cb->($handle)
116		121
117	This sets the callback that is called when the write buffer becomes empty	122	This sets the callback that is called when the write buffer becomes empty
118	(or when the callback is set and the buffer is empty already).	123	(or when the callback is set and the buffer is empty already).
119		124
120	To append to the write buffer, use the C<< ->push_write >> method.	125	To append to the write buffer, use the C<< ->push_write >> method.
		126
		127	=item timeout => $fractional_seconds
		128
		129	If non-zero, then this enables an "inactivity" timeout: whenever this many
		130	seconds pass without a successful read or write on the underlying file
		131	handle, the C<on_timeout> callback will be invoked (and if that one is
		132	missing, an C<ETIMEDOUT> error will be raised).
		133
		134	Note that timeout processing is also active when you currently do not have
		135	any outstanding read or write requests: If you plan to keep the connection
		136	idle then you should disable the timout temporarily or ignore the timeout
		137	in the C<on_timeout> callback.
		138
		139	Zero (the default) disables this timeout.
		140
		141	=item on_timeout => $cb->($handle)
		142
		143	Called whenever the inactivity timeout passes. If you return from this
		144	callback, then the timeout will be reset as if some activity had happened,
		145	so this condition is not fatal in any way.
121		146
122	=item rbuf_max => <bytes>	147	=item rbuf_max => <bytes>
123		148
124	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)	149	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)
125	when the read buffer ever (strictly) exceeds this size. This is useful to	150	when the read buffer ever (strictly) exceeds this size. This is useful to
…		…
132	isn't finished).	157	isn't finished).
133		158
134	=item read_size => <bytes>	159	=item read_size => <bytes>
135		160
136	The default read block size (the amount of bytes this module will try to read	161	The default read block size (the amount of bytes this module will try to read
137	on each [loop iteration). Default: C<4096>.	162	during each (loop iteration). Default: C<8192>.
138		163
139	=item low_water_mark => <bytes>	164	=item low_water_mark => <bytes>
140		165
141	Sets the amount of bytes (default: C<0>) that make up an "empty" write	166	Sets the amount of bytes (default: C<0>) that make up an "empty" write
142	buffer: If the write reaches this size or gets even samller it is	167	buffer: If the write reaches this size or gets even samller it is
…		…
165		190
166	Use the given Net::SSLeay::CTX object to create the new TLS connection	191	Use the given Net::SSLeay::CTX object to create the new TLS connection
167	(unless a connection object was specified directly). If this parameter is	192	(unless a connection object was specified directly). If this parameter is
168	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.	193	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.
169		194
		195	=item json => JSON or JSON::XS object
		196
		197	This is the json coder object used by the C<json> read and write types.
		198
		199	If you don't supply it, then AnyEvent::Handle will create and use a
		200	suitable one, which will write and expect UTF-8 encoded JSON texts.
		201
		202	Note that you are responsible to depend on the JSON module if you want to
		203	use this functionality, as AnyEvent does not have a dependency itself.
		204
		205	=item filter_r => $cb
		206
		207	=item filter_w => $cb
		208
		209	These exist, but are undocumented at this time.
		210
170	=back	211	=back
171		212
172	=cut	213	=cut
173		214
174	sub new {	215	sub new {
…		…
183	if ($self->{tls}) {	224	if ($self->{tls}) {
184	require Net::SSLeay;	225	require Net::SSLeay;
185	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx});	226	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx});
186	}	227	}
187		228
188	$self->on_eof (delete $self->{on_eof} ) if $self->{on_eof};	229	# $self->on_eof (delete $self->{on_eof} ) if $self->{on_eof}; # nop
189	$self->on_error (delete $self->{on_error}) if $self->{on_error};	230	# $self->on_error (delete $self->{on_error}) if $self->{on_error}; # nop
		231	# $self->on_read (delete $self->{on_read} ) if $self->{on_read}; # nop
190	$self->on_drain (delete $self->{on_drain}) if $self->{on_drain};	232	$self->on_drain (delete $self->{on_drain}) if $self->{on_drain};
191	$self->on_read (delete $self->{on_read} ) if $self->{on_read};	233
		234	$self->{_activity} = AnyEvent->now;
		235	$self->_timeout;
192		236
193	$self->start_read;	237	$self->start_read;
194		238
195	$self	239	$self
196	}	240	}
197		241
198	sub _shutdown {	242	sub _shutdown {
199	my ($self) = @_;	243	my ($self) = @_;
200		244
		245	delete $self->{_tw};
201	delete $self->{rw};	246	delete $self->{_rw};
202	delete $self->{ww};	247	delete $self->{_ww};
203	delete $self->{fh};	248	delete $self->{fh};
204	}
205		249
		250	$self->stoptls;
		251	}
		252
206	sub error {	253	sub _error {
207	my ($self) = @_;	254	my ($self, $errno, $fatal) = @_;
208		255
209	{
210	local $!;
211	$self->_shutdown;	256	$self->_shutdown
212	}	257	if $fatal;
		258
		259	$! = $errno;
213		260
214	if ($self->{on_error}) {	261	if ($self->{on_error}) {
215	$self->{on_error}($self);	262	$self->{on_error}($self, $fatal);
216	} else {	263	} else {
217	Carp::croak "AnyEvent::Handle uncaught fatal error: $!";	264	Carp::croak "AnyEvent::Handle uncaught error: $!";
218	}	265	}
219	}	266	}
220		267
221	=item $fh = $handle->fh	268	=item $fh = $handle->fh
222		269
223	This method returns the file handle of the L<AnyEvent::Handle> object.	270	This method returns the file handle of the L<AnyEvent::Handle> object.
224		271
225	=cut	272	=cut
226		273
227	sub fh { $_[0]->{fh} }	274	sub fh { $_[0]{fh} }
228		275
229	=item $handle->on_error ($cb)	276	=item $handle->on_error ($cb)
230		277
231	Replace the current C<on_error> callback (see the C<on_error> constructor argument).	278	Replace the current C<on_error> callback (see the C<on_error> constructor argument).
232		279
…		…
242		289
243	=cut	290	=cut
244		291
245	sub on_eof {	292	sub on_eof {
246	$_[0]{on_eof} = $_[1];	293	$_[0]{on_eof} = $_[1];
		294	}
		295
		296	=item $handle->on_timeout ($cb)
		297
		298	Replace the current C<on_timeout> callback, or disables the callback
		299	(but not the timeout) if C<$cb> = C<undef>. See C<timeout> constructor
		300	argument.
		301
		302	=cut
		303
		304	sub on_timeout {
		305	$_[0]{on_timeout} = $_[1];
		306	}
		307
		308	#############################################################################
		309
		310	=item $handle->timeout ($seconds)
		311
		312	Configures (or disables) the inactivity timeout.
		313
		314	=cut
		315
		316	sub timeout {
		317	my ($self, $timeout) = @_;
		318
		319	$self->{timeout} = $timeout;
		320	$self->_timeout;
		321	}
		322
		323	# reset the timeout watcher, as neccessary
		324	# also check for time-outs
		325	sub _timeout {
		326	my ($self) = @_;
		327
		328	if ($self->{timeout}) {
		329	my $NOW = AnyEvent->now;
		330
		331	# when would the timeout trigger?
		332	my $after = $self->{_activity} + $self->{timeout} - $NOW;
		333
		334	# now or in the past already?
		335	if ($after <= 0) {
		336	$self->{_activity} = $NOW;
		337
		338	if ($self->{on_timeout}) {
		339	$self->{on_timeout}($self);
		340	} else {
		341	$self->_error (&Errno::ETIMEDOUT);
		342	}
		343
		344	# callbakx could have changed timeout value, optimise
		345	return unless $self->{timeout};
		346
		347	# calculate new after
		348	$after = $self->{timeout};
		349	}
		350
		351	Scalar::Util::weaken $self;
		352
		353	$self->{_tw} \|\|= AnyEvent->timer (after => $after, cb => sub {
		354	delete $self->{_tw};
		355	$self->_timeout;
		356	});
		357	} else {
		358	delete $self->{_tw};
		359	}
247	}	360	}
248		361
249	#############################################################################	362	#############################################################################
250		363
251	=back	364	=back
…		…
288	=cut	401	=cut
289		402
290	sub _drain_wbuf {	403	sub _drain_wbuf {
291	my ($self) = @_;	404	my ($self) = @_;
292		405
293	if (!$self->{ww} && length $self->{wbuf}) {	406	if (!$self->{_ww} && length $self->{wbuf}) {
294		407
295	Scalar::Util::weaken $self;	408	Scalar::Util::weaken $self;
296		409
297	my $cb = sub {	410	my $cb = sub {
298	my $len = syswrite $self->{fh}, $self->{wbuf};	411	my $len = syswrite $self->{fh}, $self->{wbuf};
299		412
300	if ($len >= 0) {	413	if ($len >= 0) {
301	substr $self->{wbuf}, 0, $len, "";	414	substr $self->{wbuf}, 0, $len, "";
		415
		416	$self->{_activity} = AnyEvent->now;
302		417
303	$self->{on_drain}($self)	418	$self->{on_drain}($self)
304	if $self->{low_water_mark} >= length $self->{wbuf}	419	if $self->{low_water_mark} >= length $self->{wbuf}
305	&& $self->{on_drain};	420	&& $self->{on_drain};
306		421
307	delete $self->{ww} unless length $self->{wbuf};	422	delete $self->{_ww} unless length $self->{wbuf};
308	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAWOULDBLOCK) {	423	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
309	$self->error;	424	$self->_error ($!, 1);
310	}	425	}
311	};	426	};
312		427
313	# try to write data immediately	428	# try to write data immediately
314	$cb->();	429	$cb->();
315		430
316	# if still data left in wbuf, we need to poll	431	# if still data left in wbuf, we need to poll
317	$self->{ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb)	432	$self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb)
318	if length $self->{wbuf};	433	if length $self->{wbuf};
319	};	434	};
320	}	435	}
321		436
322	our %WH;	437	our %WH;
…		…
334	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")	449	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")
335	->($self, @_);	450	->($self, @_);
336	}	451	}
337		452
338	if ($self->{filter_w}) {	453	if ($self->{filter_w}) {
339	$self->{filter_w}->($self, \$_[0]);	454	$self->{filter_w}($self, \$_[0]);
340	} else {	455	} else {
341	$self->{wbuf} .= $_[0];	456	$self->{wbuf} .= $_[0];
342	$self->_drain_wbuf;	457	$self->_drain_wbuf;
343	}	458	}
344	}	459	}
345		460
346	=item $handle->push_write (type => @args)	461	=item $handle->push_write (type => @args)
347		462
348	=item $handle->unshift_write (type => @args)
349
350	Instead of formatting your data yourself, you can also let this module do	463	Instead of formatting your data yourself, you can also let this module do
351	the job by specifying a type and type-specific arguments.	464	the job by specifying a type and type-specific arguments.
352		465
353	Predefined types are (if you have ideas for additional types, feel free to	466	Predefined types are (if you have ideas for additional types, feel free to
354	drop by and tell us):	467	drop by and tell us):
…		…
358	=item netstring => $string	471	=item netstring => $string
359		472
360	Formats the given value as netstring	473	Formats the given value as netstring
361	(http://cr.yp.to/proto/netstrings.txt, this is not a recommendation to use them).	474	(http://cr.yp.to/proto/netstrings.txt, this is not a recommendation to use them).
362		475
363	=back
364
365	=cut	476	=cut
366		477
367	register_write_type netstring => sub {	478	register_write_type netstring => sub {
368	my ($self, $string) = @_;	479	my ($self, $string) = @_;
369		480
370	sprintf "%d:%s,", (length $string), $string	481	sprintf "%d:%s,", (length $string), $string
371	};	482	};
372		483
		484	=item json => $array_or_hashref
		485
		486	Encodes the given hash or array reference into a JSON object. Unless you
		487	provide your own JSON object, this means it will be encoded to JSON text
		488	in UTF-8.
		489
		490	JSON objects (and arrays) are self-delimiting, so you can write JSON at
		491	one end of a handle and read them at the other end without using any
		492	additional framing.
		493
		494	The generated JSON text is guaranteed not to contain any newlines: While
		495	this module doesn't need delimiters after or between JSON texts to be
		496	able to read them, many other languages depend on that.
		497
		498	A simple RPC protocol that interoperates easily with others is to send
		499	JSON arrays (or objects, although arrays are usually the better choice as
		500	they mimic how function argument passing works) and a newline after each
		501	JSON text:
		502
		503	$handle->push_write (json => ["method", "arg1", "arg2"]); # whatever
		504	$handle->push_write ("\012");
		505
		506	An AnyEvent::Handle receiver would simply use the C<json> read type and
		507	rely on the fact that the newline will be skipped as leading whitespace:
		508
		509	$handle->push_read (json => sub { my $array = $_[1]; ... });
		510
		511	Other languages could read single lines terminated by a newline and pass
		512	this line into their JSON decoder of choice.
		513
		514	=cut
		515
		516	register_write_type json => sub {
		517	my ($self, $ref) = @_;
		518
		519	require JSON;
		520
		521	$self->{json} ? $self->{json}->encode ($ref)
		522	: JSON::encode_json ($ref)
		523	};
		524
		525	=back
		526
373	=item AnyEvent::Handle::register_write_type type => $coderef->($self, @args)	527	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)
374		528
375	This function (not method) lets you add your own types to C<push_write>.	529	This function (not method) lets you add your own types to C<push_write>.
376	Whenever the given C<type> is used, C<push_write> will invoke the code	530	Whenever the given C<type> is used, C<push_write> will invoke the code
377	reference with the handle object and the remaining arguments.	531	reference with the handle object and the remaining arguments.
378		532
…		…
414	the specified number of bytes which give an XML datagram.	568	the specified number of bytes which give an XML datagram.
415		569
416	# in the default state, expect some header bytes	570	# in the default state, expect some header bytes
417	$handle->on_read (sub {	571	$handle->on_read (sub {
418	# some data is here, now queue the length-header-read (4 octets)	572	# some data is here, now queue the length-header-read (4 octets)
419	shift->unshift_read_chunk (4, sub {	573	shift->unshift_read (chunk => 4, sub {
420	# header arrived, decode	574	# header arrived, decode
421	my $len = unpack "N", $_[1];	575	my $len = unpack "N", $_[1];
422		576
423	# now read the payload	577	# now read the payload
424	shift->unshift_read_chunk ($len, sub {	578	shift->unshift_read (chunk => $len, sub {
425	my $xml = $_[1];	579	my $xml = $_[1];
426	# handle xml	580	# handle xml
427	});	581	});
428	});	582	});
429	});	583	});
…		…
436		590
437	# request one	591	# request one
438	$handle->push_write ("request 1\015\012");	592	$handle->push_write ("request 1\015\012");
439		593
440	# we expect "ERROR" or "OK" as response, so push a line read	594	# we expect "ERROR" or "OK" as response, so push a line read
441	$handle->push_read_line (sub {	595	$handle->push_read (line => sub {
442	# if we got an "OK", we have to _prepend_ another line,	596	# if we got an "OK", we have to _prepend_ another line,
443	# so it will be read before the second request reads its 64 bytes	597	# so it will be read before the second request reads its 64 bytes
444	# which are already in the queue when this callback is called	598	# which are already in the queue when this callback is called
445	# we don't do this in case we got an error	599	# we don't do this in case we got an error
446	if ($_[1] eq "OK") {	600	if ($_[1] eq "OK") {
447	$_[0]->unshift_read_line (sub {	601	$_[0]->unshift_read (line => sub {
448	my $response = $_[1];	602	my $response = $_[1];
449	...	603	...
450	});	604	});
451	}	605	}
452	});	606	});
453		607
454	# request two	608	# request two
455	$handle->push_write ("request 2\015\012");	609	$handle->push_write ("request 2\015\012");
456		610
457	# simply read 64 bytes, always	611	# simply read 64 bytes, always
458	$handle->push_read_chunk (64, sub {	612	$handle->push_read (chunk => 64, sub {
459	my $response = $_[1];	613	my $response = $_[1];
460	...	614	...
461	});	615	});
462		616
463	=over 4	617	=over 4
…		…
469		623
470	if (	624	if (
471	defined $self->{rbuf_max}	625	defined $self->{rbuf_max}
472	&& $self->{rbuf_max} < length $self->{rbuf}	626	&& $self->{rbuf_max} < length $self->{rbuf}
473	) {	627	) {
474	$! = &Errno::ENOSPC; return $self->error;	628	return $self->_error (&Errno::ENOSPC, 1);
475	}	629	}
476		630
477	return if $self->{in_drain};	631	return if $self->{in_drain};
478	local $self->{in_drain} = 1;	632	local $self->{in_drain} = 1;
479		633
480	while (my $len = length $self->{rbuf}) {	634	while (my $len = length $self->{rbuf}) {
481	no strict 'refs';	635	no strict 'refs';
482	if (my $cb = shift @{ $self->{queue} }) {	636	if (my $cb = shift @{ $self->{_queue} }) {
483	unless ($cb->($self)) {	637	unless ($cb->($self)) {
484	if ($self->{eof}) {	638	if ($self->{_eof}) {
485	# no progress can be made (not enough data and no data forthcoming)	639	# no progress can be made (not enough data and no data forthcoming)
486	$! = &Errno::EPIPE; return $self->error;	640	return $self->_error (&Errno::EPIPE, 1);
487	}	641	}
488		642
489	unshift @{ $self->{queue} }, $cb;	643	unshift @{ $self->{_queue} }, $cb;
490	return;	644	return;
491	}	645	}
492	} elsif ($self->{on_read}) {	646	} elsif ($self->{on_read}) {
493	$self->{on_read}($self);	647	$self->{on_read}($self);
494		648
495	if (	649	if (
496	$self->{eof} # if no further data will arrive	650	$self->{_eof} # if no further data will arrive
497	&& $len == length $self->{rbuf} # and no data has been consumed	651	&& $len == length $self->{rbuf} # and no data has been consumed
498	&& !@{ $self->{queue} } # and the queue is still empty	652	&& !@{ $self->{_queue} } # and the queue is still empty
499	&& $self->{on_read} # and we still want to read data	653	&& $self->{on_read} # and we still want to read data
500	) {	654	) {
501	# then no progress can be made	655	# then no progress can be made
502	$! = &Errno::EPIPE; return $self->error;	656	return $self->_error (&Errno::EPIPE, 1);
503	}	657	}
504	} else {	658	} else {
505	# read side becomes idle	659	# read side becomes idle
506	delete $self->{rw};	660	delete $self->{_rw};
507	return;	661	return;
508	}	662	}
509	}	663	}
510		664
511	if ($self->{eof}) {
512	$self->_shutdown;
513	$self->{on_eof}($self)	665	$self->{on_eof}($self)
514	if $self->{on_eof};	666	if $self->{_eof} && $self->{on_eof};
515	}
516	}	667	}
517		668
518	=item $handle->on_read ($cb)	669	=item $handle->on_read ($cb)
519		670
520	This replaces the currently set C<on_read> callback, or clears it (when	671	This replaces the currently set C<on_read> callback, or clears it (when
…		…
582		733
583	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read")	734	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read")
584	->($self, $cb, @_);	735	->($self, $cb, @_);
585	}	736	}
586		737
587	push @{ $self->{queue} }, $cb;	738	push @{ $self->{_queue} }, $cb;
588	$self->_drain_rbuf;	739	$self->_drain_rbuf;
589	}	740	}
590		741
591	sub unshift_read {	742	sub unshift_read {
592	my $self = shift;	743	my $self = shift;
…		…
598	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read")	749	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read")
599	->($self, $cb, @_);	750	->($self, $cb, @_);
600	}	751	}
601		752
602		753
603	unshift @{ $self->{queue} }, $cb;	754	unshift @{ $self->{_queue} }, $cb;
604	$self->_drain_rbuf;	755	$self->_drain_rbuf;
605	}	756	}
606		757
607	=item $handle->push_read (type => @args, $cb)	758	=item $handle->push_read (type => @args, $cb)
608		759
…		…
615	Predefined types are (if you have ideas for additional types, feel free to	766	Predefined types are (if you have ideas for additional types, feel free to
616	drop by and tell us):	767	drop by and tell us):
617		768
618	=over 4	769	=over 4
619		770
620	=item chunk => $octets, $cb->($self, $data)	771	=item chunk => $octets, $cb->($handle, $data)
621		772
622	Invoke the callback only once C<$octets> bytes have been read. Pass the	773	Invoke the callback only once C<$octets> bytes have been read. Pass the
623	data read to the callback. The callback will never be called with less	774	data read to the callback. The callback will never be called with less
624	data.	775	data.
625		776
…		…
648		799
649	sub unshift_read_chunk {	800	sub unshift_read_chunk {
650	$_[0]->unshift_read (chunk => $_[1], $_[2]);	801	$_[0]->unshift_read (chunk => $_[1], $_[2]);
651	}	802	}
652		803
653	=item line => [$eol, ]$cb->($self, $line, $eol)	804	=item line => [$eol, ]$cb->($handle, $line, $eol)
654		805
655	The callback will be called only once a full line (including the end of	806	The callback will be called only once a full line (including the end of
656	line marker, C<$eol>) has been read. This line (excluding the end of line	807	line marker, C<$eol>) has been read. This line (excluding the end of line
657	marker) will be passed to the callback as second argument (C<$line>), and	808	marker) will be passed to the callback as second argument (C<$line>), and
658	the end of line marker as the third argument (C<$eol>).	809	the end of line marker as the third argument (C<$eol>).
…		…
695	sub unshift_read_line {	846	sub unshift_read_line {
696	my $self = shift;	847	my $self = shift;
697	$self->unshift_read (line => @_);	848	$self->unshift_read (line => @_);
698	}	849	}
699		850
700	=item netstring => $cb->($string)	851	=item netstring => $cb->($handle, $string)
701		852
702	A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement).	853	A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement).
703		854
704	Throws an error with C<$!> set to EBADMSG on format violations.	855	Throws an error with C<$!> set to EBADMSG on format violations.
705		856
…		…
709	my ($self, $cb) = @_;	860	my ($self, $cb) = @_;
710		861
711	sub {	862	sub {
712	unless ($_[0]{rbuf} =~ s/^(0\|[1-9][0-9]*)://) {	863	unless ($_[0]{rbuf} =~ s/^(0\|[1-9][0-9]*)://) {
713	if ($_[0]{rbuf} =~ /[^0-9]/) {	864	if ($_[0]{rbuf} =~ /[^0-9]/) {
714	$! = &Errno::EBADMSG;	865	$self->_error (&Errno::EBADMSG);
715	$self->error;
716	}	866	}
717	return;	867	return;
718	}	868	}
719		869
720	my $len = $1;	870	my $len = $1;
…		…
723	my $string = $_[1];	873	my $string = $_[1];
724	$_[0]->unshift_read (chunk => 1, sub {	874	$_[0]->unshift_read (chunk => 1, sub {
725	if ($_[1] eq ",") {	875	if ($_[1] eq ",") {
726	$cb->($_[0], $string);	876	$cb->($_[0], $string);
727	} else {	877	} else {
728	$! = &Errno::EBADMSG;	878	$self->_error (&Errno::EBADMSG);
729	$self->error;
730	}	879	}
731	});	880	});
732	});	881	});
733		882
734	1	883	1
735	}	884	}
736	};	885	};
737		886
738	=item regex => $accept[, $reject[, $skip], $cb->($data)	887	=item regex => $accept[, $reject[, $skip], $cb->($handle, $data)
739		888
740	Makes a regex match against the regex object C<$accept> and returns	889	Makes a regex match against the regex object C<$accept> and returns
741	everything up to and including the match.	890	everything up to and including the match.
742		891
743	Example: read a single line terminated by '\n'.	892	Example: read a single line terminated by '\n'.
…		…
791	return 1;	940	return 1;
792	}	941	}
793		942
794	# reject	943	# reject
795	if ($reject && $$rbuf =~ $reject) {	944	if ($reject && $$rbuf =~ $reject) {
796	$! = &Errno::EBADMSG;	945	$self->_error (&Errno::EBADMSG);
797	$self->error;
798	}	946	}
799		947
800	# skip	948	# skip
801	if ($skip && $$rbuf =~ $skip) {	949	if ($skip && $$rbuf =~ $skip) {
802	$data .= substr $$rbuf, 0, $+[0], "";	950	$data .= substr $$rbuf, 0, $+[0], "";
…		…
804		952
805	()	953	()
806	}	954	}
807	};	955	};
808		956
		957	=item json => $cb->($handle, $hash_or_arrayref)
		958
		959	Reads a JSON object or array, decodes it and passes it to the callback.
		960
		961	If a C<json> object was passed to the constructor, then that will be used
		962	for the final decode, otherwise it will create a JSON coder expecting UTF-8.
		963
		964	This read type uses the incremental parser available with JSON version
		965	2.09 (and JSON::XS version 2.2) and above. You have to provide a
		966	dependency on your own: this module will load the JSON module, but
		967	AnyEvent does not depend on it itself.
		968
		969	Since JSON texts are fully self-delimiting, the C<json> read and write
		970	types are an ideal simple RPC protocol: just exchange JSON datagrams. See
		971	the C<json> write type description, above, for an actual example.
		972
		973	=cut
		974
		975	register_read_type json => sub {
		976	my ($self, $cb, $accept, $reject, $skip) = @_;
		977
		978	require JSON;
		979
		980	my $data;
		981	my $rbuf = \$self->{rbuf};
		982
		983	my $json = $self->{json} \|\|= JSON->new->utf8;
		984
		985	sub {
		986	my $ref = $json->incr_parse ($self->{rbuf});
		987
		988	if ($ref) {
		989	$self->{rbuf} = $json->incr_text;
		990	$json->incr_text = "";
		991	$cb->($self, $ref);
		992
		993	1
		994	} else {
		995	$self->{rbuf} = "";
		996	()
		997	}
		998	}
		999	};
		1000
809	=back	1001	=back
810		1002
811	=item AnyEvent::Handle::register_read_type type => $coderef->($self, $cb, @args)	1003	=item AnyEvent::Handle::register_read_type type => $coderef->($handle, $cb, @args)
812		1004
813	This function (not method) lets you add your own types to C<push_read>.	1005	This function (not method) lets you add your own types to C<push_read>.
814		1006
815	Whenever the given C<type> is used, C<push_read> will invoke the code	1007	Whenever the given C<type> is used, C<push_read> will invoke the code
816	reference with the handle object, the callback and the remaining	1008	reference with the handle object, the callback and the remaining
…		…
818		1010
819	The code reference is supposed to return a callback (usually a closure)	1011	The code reference is supposed to return a callback (usually a closure)
820	that works as a plain read callback (see C<< ->push_read ($cb) >>).	1012	that works as a plain read callback (see C<< ->push_read ($cb) >>).
821		1013
822	It should invoke the passed callback when it is done reading (remember to	1014	It should invoke the passed callback when it is done reading (remember to
823	pass C<$self> as first argument as all other callbacks do that).	1015	pass C<$handle> as first argument as all other callbacks do that).
824		1016
825	Note that this is a function, and all types registered this way will be	1017	Note that this is a function, and all types registered this way will be
826	global, so try to use unique names.	1018	global, so try to use unique names.
827		1019
828	For examples, see the source of this module (F<perldoc -m AnyEvent::Handle>,	1020	For examples, see the source of this module (F<perldoc -m AnyEvent::Handle>,
…		…
840	=cut	1032	=cut
841		1033
842	sub stop_read {	1034	sub stop_read {
843	my ($self) = @_;	1035	my ($self) = @_;
844		1036
845	delete $self->{rw};	1037	delete $self->{_rw};
846	}	1038	}
847		1039
848	sub start_read {	1040	sub start_read {
849	my ($self) = @_;	1041	my ($self) = @_;
850		1042
851	unless ($self->{rw} \|\| $self->{eof}) {	1043	unless ($self->{_rw} \|\| $self->{_eof}) {
852	Scalar::Util::weaken $self;	1044	Scalar::Util::weaken $self;
853		1045
854	$self->{rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {	1046	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {
855	my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf};	1047	my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf};
856	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} \|\| 8192, length $$rbuf;	1048	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} \|\| 8192, length $$rbuf;
857		1049
858	if ($len > 0) {	1050	if ($len > 0) {
		1051	$self->{_activity} = AnyEvent->now;
		1052
859	$self->{filter_r}	1053	$self->{filter_r}
860	? $self->{filter_r}->($self, $rbuf)	1054	? $self->{filter_r}($self, $rbuf)
861	: $self->_drain_rbuf;	1055	: $self->_drain_rbuf;
862		1056
863	} elsif (defined $len) {	1057	} elsif (defined $len) {
864	delete $self->{rw};	1058	delete $self->{_rw};
865	$self->{eof} = 1;	1059	$self->{_eof} = 1;
866	$self->_drain_rbuf;	1060	$self->_drain_rbuf;
867		1061
868	} elsif ($! != EAGAIN && $! != EINTR && $! != &AnyEvent::Util::WSAWOULDBLOCK) {	1062	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
869	return $self->error;	1063	return $self->_error ($!, 1);
870	}	1064	}
871	});	1065	});
872	}	1066	}
873	}	1067	}
874		1068
875	sub _dotls {	1069	sub _dotls {
876	my ($self) = @_;	1070	my ($self) = @_;
877		1071
878	if (length $self->{tls_wbuf}) {	1072	if (length $self->{_tls_wbuf}) {
879	while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{tls_wbuf})) > 0) {	1073	while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {
880	substr $self->{tls_wbuf}, 0, $len, "";	1074	substr $self->{_tls_wbuf}, 0, $len, "";
881	}	1075	}
882	}	1076	}
883		1077
884	if (defined (my $buf = Net::SSLeay::BIO_read ($self->{tls_wbio}))) {	1078	if (defined (my $buf = Net::SSLeay::BIO_read ($self->{_wbio}))) {
885	$self->{wbuf} .= $buf;	1079	$self->{wbuf} .= $buf;
886	$self->_drain_wbuf;	1080	$self->_drain_wbuf;
887	}	1081	}
888		1082
889	while (defined (my $buf = Net::SSLeay::read ($self->{tls}))) {	1083	while (defined (my $buf = Net::SSLeay::read ($self->{tls}))) {
…		…
893		1087
894	my $err = Net::SSLeay::get_error ($self->{tls}, -1);	1088	my $err = Net::SSLeay::get_error ($self->{tls}, -1);
895		1089
896	if ($err!= Net::SSLeay::ERROR_WANT_READ ()) {	1090	if ($err!= Net::SSLeay::ERROR_WANT_READ ()) {
897	if ($err == Net::SSLeay::ERROR_SYSCALL ()) {	1091	if ($err == Net::SSLeay::ERROR_SYSCALL ()) {
898	$self->error;	1092	return $self->_error ($!, 1);
899	} elsif ($err == Net::SSLeay::ERROR_SSL ()) {	1093	} elsif ($err == Net::SSLeay::ERROR_SSL ()) {
900	$! = &Errno::EIO;	1094	return $self->_error (&Errno::EIO, 1);
901	$self->error;
902	}	1095	}
903		1096
904	# all others are fine for our purposes	1097	# all others are fine for our purposes
905	}	1098	}
906	}	1099	}
…		…
915	C<"connect">, C<"accept"> or an existing Net::SSLeay object).	1108	C<"connect">, C<"accept"> or an existing Net::SSLeay object).
916		1109
917	The second argument is the optional C<Net::SSLeay::CTX> object that is	1110	The second argument is the optional C<Net::SSLeay::CTX> object that is
918	used when AnyEvent::Handle has to create its own TLS connection object.	1111	used when AnyEvent::Handle has to create its own TLS connection object.
919		1112
920	=cut	1113	The TLS connection object will end up in C<< $handle->{tls} >> after this
		1114	call and can be used or changed to your liking. Note that the handshake
		1115	might have already started when this function returns.
921		1116
922	# TODO: maybe document...	1117	=cut
		1118
923	sub starttls {	1119	sub starttls {
924	my ($self, $ssl, $ctx) = @_;	1120	my ($self, $ssl, $ctx) = @_;
925		1121
926	$self->stoptls;	1122	$self->stoptls;
927		1123
…		…
942	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html	1138	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html
943	Net::SSLeay::CTX_set_mode ($self->{tls},	1139	Net::SSLeay::CTX_set_mode ($self->{tls},
944	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } \|\| 1)	1140	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } \|\| 1)
945	\| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } \|\| 2));	1141	\| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } \|\| 2));
946		1142
947	$self->{tls_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1143	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
948	$self->{tls_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1144	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
949		1145
950	Net::SSLeay::set_bio ($ssl, $self->{tls_rbio}, $self->{tls_wbio});	1146	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});
951		1147
952	$self->{filter_w} = sub {	1148	$self->{filter_w} = sub {
953	$_[0]{tls_wbuf} .= ${$_[1]};	1149	$_[0]{_tls_wbuf} .= ${$_[1]};
954	&_dotls;	1150	&_dotls;
955	};	1151	};
956	$self->{filter_r} = sub {	1152	$self->{filter_r} = sub {
957	Net::SSLeay::BIO_write ($_[0]{tls_rbio}, ${$_[1]});	1153	Net::SSLeay::BIO_write ($_[0]{_rbio}, ${$_[1]});
958	&_dotls;	1154	&_dotls;
959	};	1155	};
960	}	1156	}
961		1157
962	=item $handle->stoptls	1158	=item $handle->stoptls
…		…
968		1164
969	sub stoptls {	1165	sub stoptls {
970	my ($self) = @_;	1166	my ($self) = @_;
971		1167
972	Net::SSLeay::free (delete $self->{tls}) if $self->{tls};	1168	Net::SSLeay::free (delete $self->{tls}) if $self->{tls};
		1169
973	delete $self->{tls_rbio};	1170	delete $self->{_rbio};
974	delete $self->{tls_wbio};	1171	delete $self->{_wbio};
975	delete $self->{tls_wbuf};	1172	delete $self->{_tls_wbuf};
976	delete $self->{filter_r};	1173	delete $self->{filter_r};
977	delete $self->{filter_w};	1174	delete $self->{filter_w};
978	}	1175	}
979		1176
980	sub DESTROY {	1177	sub DESTROY {
…		…
1018	}	1215	}
1019	}	1216	}
1020		1217
1021	=back	1218	=back
1022		1219
		1220	=head1 SUBCLASSING AnyEvent::Handle
		1221
		1222	In many cases, you might want to subclass AnyEvent::Handle.
		1223
		1224	To make this easier, a given version of AnyEvent::Handle uses these
		1225	conventions:
		1226
		1227	=over 4
		1228
		1229	=item * all constructor arguments become object members.
		1230
		1231	At least initially, when you pass a C<tls>-argument to the constructor it
		1232	will end up in C<< $handle->{tls} >>. Those members might be changes or
		1233	mutated later on (for example C<tls> will hold the TLS connection object).
		1234
		1235	=item * other object member names are prefixed with an C<_>.
		1236
		1237	All object members not explicitly documented (internal use) are prefixed
		1238	with an underscore character, so the remaining non-C<_>-namespace is free
		1239	for use for subclasses.
		1240
		1241	=item * all members not documented here and not prefixed with an underscore
		1242	are free to use in subclasses.
		1243
		1244	Of course, new versions of AnyEvent::Handle may introduce more "public"
		1245	member variables, but thats just life, at least it is documented.
		1246
		1247	=back
		1248
1023	=head1 AUTHOR	1249	=head1 AUTHOR
1024		1250
1025	Robin Redeker C<< <elmex at ta-sa.org> >>, Marc Lehmann <schmorp@schmorp.de>.	1251	Robin Redeker C<< <elmex at ta-sa.org> >>, Marc Lehmann <schmorp@schmorp.de>.
1026		1252
1027	=cut	1253	=cut

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Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents): Revision 1.36 by root, Mon May 26 18:26:52 2008 UTC vs. Revision 1.53 by root, Mon Jun 2 09:12:14 2008 UTC

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Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.36 by root, Mon May 26 18:26:52 2008 UTC vs.
Revision 1.53 by root, Mon Jun 2 09:12:14 2008 UTC