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

Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.68 by root, Fri Jun 6 15:35:30 2008 UTC vs.
Revision 1.109 by root, Wed Jan 14 02:03:43 2009 UTC

…		…
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 ();
14		14
15	AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent	15	AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent
16		16
17	=cut	17	=cut
18		18
19	our $VERSION = 4.151;	19	our $VERSION = 4.331;
20		20
21	=head1 SYNOPSIS	21	=head1 SYNOPSIS
22		22
23	use AnyEvent;	23	use AnyEvent;
24	use AnyEvent::Handle;	24	use AnyEvent::Handle;
…		…
27		27
28	my $handle =	28	my $handle =
29	AnyEvent::Handle->new (	29	AnyEvent::Handle->new (
30	fh => \*STDIN,	30	fh => \*STDIN,
31	on_eof => sub {	31	on_eof => sub {
32	$cv->broadcast;	32	$cv->send;
33	},	33	},
34	);	34	);
35		35
36	# send some request line	36	# send some request line
37	$handle->push_write ("getinfo\015\012");	37	$handle->push_write ("getinfo\015\012");
…		…
49		49
50	This module is a helper module to make it easier to do event-based I/O on	50	This module is a helper module to make it easier to do event-based I/O on
51	filehandles. For utility functions for doing non-blocking connects and accepts	51	filehandles. For utility functions for doing non-blocking connects and accepts
52	on sockets see L<AnyEvent::Util>.	52	on sockets see L<AnyEvent::Util>.
53		53
		54	The L<AnyEvent::Intro> tutorial contains some well-documented
		55	AnyEvent::Handle examples.
		56
54	In the following, when the documentation refers to of "bytes" then this	57	In the following, when the documentation refers to of "bytes" then this
55	means characters. As sysread and syswrite are used for all I/O, their	58	means characters. As sysread and syswrite are used for all I/O, their
56	treatment of characters applies to this module as well.	59	treatment of characters applies to this module as well.
57		60
58	All callbacks will be invoked with the handle object as their first	61	All callbacks will be invoked with the handle object as their first
…		…
70		73
71	=item fh => $filehandle [MANDATORY]	74	=item fh => $filehandle [MANDATORY]
72		75
73	The filehandle this L<AnyEvent::Handle> object will operate on.	76	The filehandle this L<AnyEvent::Handle> object will operate on.
74		77
75	NOTE: The filehandle will be set to non-blocking (using	78	NOTE: The filehandle will be set to non-blocking mode (using
76	AnyEvent::Util::fh_nonblocking).	79	C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in
		80	that mode.
77		81
78	=item on_eof => $cb->($handle)	82	=item on_eof => $cb->($handle)
79		83
80	Set the callback to be called when an end-of-file condition is detcted,	84	Set the callback to be called when an end-of-file condition is detected,
81	i.e. in the case of a socket, when the other side has closed the	85	i.e. in the case of a socket, when the other side has closed the
82	connection cleanly.	86	connection cleanly.
83		87
		88	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
		90	callback and continue writing data, as only the read part has been shut
		91	down.
		92
84	While not mandatory, it is highly recommended to set an eof callback,	93	While not mandatory, it is I<highly> recommended to set an EOF callback,
85	otherwise you might end up with a closed socket while you are still	94	otherwise you might end up with a closed socket while you are still
86	waiting for data.	95	waiting for data.
		96
		97	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>.
87		99
88	=item on_error => $cb->($handle, $fatal)	100	=item on_error => $cb->($handle, $fatal)
89		101
90	This is the error callback, which is called when, well, some error	102	This is the error callback, which is called when, well, some error
91	occured, such as not being able to resolve the hostname, failure to	103	occured, such as not being able to resolve the hostname, failure to
92	connect or a read error.	104	connect or a read error.
93		105
94	Some errors are fatal (which is indicated by C<$fatal> being true). On	106	Some errors are fatal (which is indicated by C<$fatal> being true). On
95	fatal errors the handle object will be shut down and will not be	107	fatal errors the handle object will be shut down and will not be usable
		108	(but you are free to look at the current C<< ->rbuf >>). Examples of fatal
		109	errors are an EOF condition with active (but unsatisifable) read watchers
		110	(C<EPIPE>) or I/O errors.
		111
96	usable. Non-fatal errors can be retried by simply returning, but it is	112	Non-fatal errors can be retried by simply returning, but it is recommended
97	recommended to simply ignore this parameter and instead abondon the handle	113	to simply ignore this parameter and instead abondon the handle object
98	object when this callback is invoked.	114	when this callback is invoked. Examples of non-fatal errors are timeouts
		115	C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>).
99		116
100	On callback entrance, the value of C<$!> contains the operating system	117	On callback entrance, the value of C<$!> contains the operating system
101	error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>).	118	error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>).
102		119
103	While not mandatory, it is I<highly> recommended to set this callback, as	120	While not mandatory, it is I<highly> recommended to set this callback, as
…		…
124	This sets the callback that is called when the write buffer becomes empty	141	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).	142	(or when the callback is set and the buffer is empty already).
126		143
127	To append to the write buffer, use the C<< ->push_write >> method.	144	To append to the write buffer, use the C<< ->push_write >> method.
128		145
		146	This callback is useful when you don't want to put all of your write data
		147	into the queue at once, for example, when you want to write the contents
		148	of some file to the socket you might not want to read the whole file into
		149	memory and push it into the queue, but instead only read more data from
		150	the file when the write queue becomes empty.
		151
129	=item timeout => $fractional_seconds	152	=item timeout => $fractional_seconds
130		153
131	If non-zero, then this enables an "inactivity" timeout: whenever this many	154	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	155	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	156	handle, the C<on_timeout> callback will be invoked (and if that one is
134	missing, an C<ETIMEDOUT> error will be raised).	157	missing, a non-fatal C<ETIMEDOUT> error will be raised).
135		158
136	Note that timeout processing is also active when you currently do not have	159	Note that timeout processing is also active when you currently do not have
137	any outstanding read or write requests: If you plan to keep the connection	160	any outstanding read or write requests: If you plan to keep the connection
138	idle then you should disable the timout temporarily or ignore the timeout	161	idle then you should disable the timout temporarily or ignore the timeout
139	in the C<on_timeout> callback.	162	in the C<on_timeout> callback, in which case AnyEvent::Handle will simply
		163	restart the timeout.
140		164
141	Zero (the default) disables this timeout.	165	Zero (the default) disables this timeout.
142		166
143	=item on_timeout => $cb->($handle)	167	=item on_timeout => $cb->($handle)
144		168
…		…
148		172
149	=item rbuf_max => <bytes>	173	=item rbuf_max => <bytes>
150		174
151	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)	175	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)
152	when the read buffer ever (strictly) exceeds this size. This is useful to	176	when the read buffer ever (strictly) exceeds this size. This is useful to
153	avoid denial-of-service attacks.	177	avoid some forms of denial-of-service attacks.
154		178
155	For example, a server accepting connections from untrusted sources should	179	For example, a server accepting connections from untrusted sources should
156	be configured to accept only so-and-so much data that it cannot act on	180	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	181	(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	182	amount of data without a callback ever being called as long as the line
159	isn't finished).	183	isn't finished).
160		184
		185	=item autocork => <boolean>
		186
		187	When disabled (the default), then C<push_write> will try to immediately
		188	write the data to the handle, if possible. This avoids having to register
		189	a write watcher and wait for the next event loop iteration, but can
		190	be inefficient if you write multiple small chunks (on the wire, this
		191	disadvantage is usually avoided by your kernel's nagle algorithm, see
		192	C<no_delay>, but this option can save costly syscalls).
		193
		194	When enabled, then writes will always be queued till the next event loop
		195	iteration. This is efficient when you do many small writes per iteration,
		196	but less efficient when you do a single write only per iteration (or when
		197	the write buffer often is full). It also increases write latency.
		198
		199	=item no_delay => <boolean>
		200
		201	When doing small writes on sockets, your operating system kernel might
		202	wait a bit for more data before actually sending it out. This is called
		203	the Nagle algorithm, and usually it is beneficial.
		204
		205	In some situations you want as low a delay as possible, which can be
		206	accomplishd by setting this option to a true value.
		207
		208	The default is your opertaing system's default behaviour (most likely
		209	enabled), this option explicitly enables or disables it, if possible.
		210
161	=item read_size => <bytes>	211	=item read_size => <bytes>
162		212
163	The default read block size (the amount of bytes this module will try to read	213	The default read block size (the amount of bytes this module will
164	during each (loop iteration). Default: C<8192>.	214	try to read during each loop iteration, which affects memory
		215	requirements). Default: C<8192>.
165		216
166	=item low_water_mark => <bytes>	217	=item low_water_mark => <bytes>
167		218
168	Sets the amount of bytes (default: C<0>) that make up an "empty" write	219	Sets the amount of bytes (default: C<0>) that make up an "empty" write
169	buffer: If the write reaches this size or gets even samller it is	220	buffer: If the write reaches this size or gets even samller it is
170	considered empty.	221	considered empty.
171		222
		223	Sometimes it can be beneficial (for performance reasons) to add data to
		224	the write buffer before it is fully drained, but this is a rare case, as
		225	the operating system kernel usually buffers data as well, so the default
		226	is good in almost all cases.
		227
172	=item linger => <seconds>	228	=item linger => <seconds>
173		229
174	If non-zero (default: C<3600>), then the destructor of the	230	If non-zero (default: C<3600>), then the destructor of the
175	AnyEvent::Handle object will check wether there is still outstanding write	231	AnyEvent::Handle object will check whether there is still outstanding
176	data and will install a watcher that will write out this data. No errors	232	write data and will install a watcher that will write this data to the
177	will be reported (this mostly matches how the operating system treats	233	socket. No errors will be reported (this mostly matches how the operating
178	outstanding data at socket close time).	234	system treats outstanding data at socket close time).
179		235
180	This will not work for partial TLS data that could not yet been	236	This will not work for partial TLS data that could not be encoded
181	encoded. This data will be lost.	237	yet. This data will be lost. Calling the C<stoptls> method in time might
		238	help.
182		239
183	=item tls => "accept" \| "connect" \| Net::SSLeay::SSL object	240	=item tls => "accept" \| "connect" \| Net::SSLeay::SSL object
184		241
185	When this parameter is given, it enables TLS (SSL) mode, that means it	242	When this parameter is given, it enables TLS (SSL) mode, that means
186	will start making tls handshake and will transparently encrypt/decrypt	243	AnyEvent will start a TLS handshake as soon as the conenction has been
187	data.	244	established and will transparently encrypt/decrypt data afterwards.
188		245
189	TLS mode requires Net::SSLeay to be installed (it will be loaded	246	TLS mode requires Net::SSLeay to be installed (it will be loaded
190	automatically when you try to create a TLS handle).	247	automatically when you try to create a TLS handle): this module doesn't
		248	have a dependency on that module, so if your module requires it, you have
		249	to add the dependency yourself.
191		250
192	For the TLS server side, use C<accept>, and for the TLS client side of a	251	Unlike TCP, TLS has a server and client side: for the TLS server side, use
193	connection, use C<connect> mode.	252	C<accept>, and for the TLS client side of a connection, use C<connect>
		253	mode.
194		254
195	You can also provide your own TLS connection object, but you have	255	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>	256	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	257	or C<Net::SSLeay::set_accept_state> on it before you pass it to
198	AnyEvent::Handle.	258	AnyEvent::Handle.
199		259
		260	B<IMPORTANT:> since Net::SSLeay "objects" are really only integers,
		261	passing in the wrong integer will lead to certain crash. This most often
		262	happens when one uses a stylish C<< tls => 1 >> and is surprised about the
		263	segmentation fault.
		264
200	See the C<starttls> method if you need to start TLs negotiation later.	265	See the C<< ->starttls >> method for when need to start TLS negotiation later.
201		266
202	=item tls_ctx => $ssl_ctx	267	=item tls_ctx => $ssl_ctx
203		268
204	Use the given Net::SSLeay::CTX object to create the new TLS connection	269	Use the given C<Net::SSLeay::CTX> object to create the new TLS connection
205	(unless a connection object was specified directly). If this parameter is	270	(unless a connection object was specified directly). If this parameter is
206	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.	271	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.
207		272
208	=item json => JSON or JSON::XS object	273	=item json => JSON or JSON::XS object
209		274
210	This is the json coder object used by the C<json> read and write types.	275	This is the json coder object used by the C<json> read and write types.
211		276
212	If you don't supply it, then AnyEvent::Handle will create and use a	277	If you don't supply it, then AnyEvent::Handle will create and use a
213	suitable one, which will write and expect UTF-8 encoded JSON texts.	278	suitable one (on demand), which will write and expect UTF-8 encoded JSON
		279	texts.
214		280
215	Note that you are responsible to depend on the JSON module if you want to	281	Note that you are responsible to depend on the JSON module if you want to
216	use this functionality, as AnyEvent does not have a dependency itself.	282	use this functionality, as AnyEvent does not have a dependency itself.
217		283
218	=item filter_r => $cb
219
220	=item filter_w => $cb
221
222	These exist, but are undocumented at this time.
223
224	=back	284	=back
225		285
226	=cut	286	=cut
227		287
228	sub new {	288	sub new {
…		…
232		292
233	$self->{fh} or Carp::croak "mandatory argument fh is missing";	293	$self->{fh} or Carp::croak "mandatory argument fh is missing";
234		294
235	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;	295	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;
236		296
237	if ($self->{tls}) {
238	require Net::SSLeay;
239	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx});	297	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx})
240	}	298	if $self->{tls};
241		299
242	$self->{_activity} = AnyEvent->now;	300	$self->{_activity} = AnyEvent->now;
243	$self->_timeout;	301	$self->_timeout;
244		302
245	$self->on_drain (delete $self->{on_drain}) if $self->{on_drain};	303	$self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain};
		304	$self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay};
246		305
247	$self->start_read	306	$self->start_read
248	if $self->{on_read};	307	if $self->{on_read};
249		308
250	$self	309	$self
…		…
256	delete $self->{_tw};	315	delete $self->{_tw};
257	delete $self->{_rw};	316	delete $self->{_rw};
258	delete $self->{_ww};	317	delete $self->{_ww};
259	delete $self->{fh};	318	delete $self->{fh};
260		319
261	$self->stoptls;	320	&_freetls;
		321
		322	delete $self->{on_read};
		323	delete $self->{_queue};
262	}	324	}
263		325
264	sub _error {	326	sub _error {
265	my ($self, $errno, $fatal) = @_;	327	my ($self, $errno, $fatal) = @_;
266		328
…		…
269		331
270	$! = $errno;	332	$! = $errno;
271		333
272	if ($self->{on_error}) {	334	if ($self->{on_error}) {
273	$self->{on_error}($self, $fatal);	335	$self->{on_error}($self, $fatal);
274	} else {	336	} elsif ($self->{fh}) {
275	Carp::croak "AnyEvent::Handle uncaught error: $!";	337	Carp::croak "AnyEvent::Handle uncaught error: $!";
276	}	338	}
277	}	339	}
278		340
279	=item $fh = $handle->fh	341	=item $fh = $handle->fh
280		342
281	This method returns the file handle of the L<AnyEvent::Handle> object.	343	This method returns the file handle used to create the L<AnyEvent::Handle> object.
282		344
283	=cut	345	=cut
284		346
285	sub fh { $_[0]{fh} }	347	sub fh { $_[0]{fh} }
286		348
…		…
304	$_[0]{on_eof} = $_[1];	366	$_[0]{on_eof} = $_[1];
305	}	367	}
306		368
307	=item $handle->on_timeout ($cb)	369	=item $handle->on_timeout ($cb)
308		370
309	Replace the current C<on_timeout> callback, or disables the callback	371	Replace the current C<on_timeout> callback, or disables the callback (but
310	(but not the timeout) if C<$cb> = C<undef>. See C<timeout> constructor	372	not the timeout) if C<$cb> = C<undef>. See the C<timeout> constructor
311	argument.	373	argument and method.
312		374
313	=cut	375	=cut
314		376
315	sub on_timeout {	377	sub on_timeout {
316	$_[0]{on_timeout} = $_[1];	378	$_[0]{on_timeout} = $_[1];
		379	}
		380
		381	=item $handle->autocork ($boolean)
		382
		383	Enables or disables the current autocork behaviour (see C<autocork>
		384	constructor argument). Changes will only take effect on the next write.
		385
		386	=cut
		387
		388	sub autocork {
		389	$_[0]{autocork} = $_[1];
		390	}
		391
		392	=item $handle->no_delay ($boolean)
		393
		394	Enables or disables the C<no_delay> setting (see constructor argument of
		395	the same name for details).
		396
		397	=cut
		398
		399	sub no_delay {
		400	$_[0]{no_delay} = $_[1];
		401
		402	eval {
		403	local $SIG{__DIE__};
		404	setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1];
		405	};
317	}	406	}
318		407
319	#############################################################################	408	#############################################################################
320		409
321	=item $handle->timeout ($seconds)	410	=item $handle->timeout ($seconds)
…		…
399	my ($self, $cb) = @_;	488	my ($self, $cb) = @_;
400		489
401	$self->{on_drain} = $cb;	490	$self->{on_drain} = $cb;
402		491
403	$cb->($self)	492	$cb->($self)
404	if $cb && $self->{low_water_mark} >= length $self->{wbuf};	493	if $cb && $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf});
405	}	494	}
406		495
407	=item $handle->push_write ($data)	496	=item $handle->push_write ($data)
408		497
409	Queues the given scalar to be written. You can push as much data as you	498	Queues the given scalar to be written. You can push as much data as you
…		…
426	substr $self->{wbuf}, 0, $len, "";	515	substr $self->{wbuf}, 0, $len, "";
427		516
428	$self->{_activity} = AnyEvent->now;	517	$self->{_activity} = AnyEvent->now;
429		518
430	$self->{on_drain}($self)	519	$self->{on_drain}($self)
431	if $self->{low_water_mark} >= length $self->{wbuf}	520	if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf})
432	&& $self->{on_drain};	521	&& $self->{on_drain};
433		522
434	delete $self->{_ww} unless length $self->{wbuf};	523	delete $self->{_ww} unless length $self->{wbuf};
435	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	524	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
436	$self->_error ($!, 1);	525	$self->_error ($!, 1);
437	}	526	}
438	};	527	};
439		528
440	# try to write data immediately	529	# try to write data immediately
441	$cb->();	530	$cb->() unless $self->{autocork};
442		531
443	# if still data left in wbuf, we need to poll	532	# if still data left in wbuf, we need to poll
444	$self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb)	533	$self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb)
445	if length $self->{wbuf};	534	if length $self->{wbuf};
446	};	535	};
…		…
460		549
461	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")	550	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")
462	->($self, @_);	551	->($self, @_);
463	}	552	}
464		553
465	if ($self->{filter_w}) {	554	if ($self->{tls}) {
466	$self->{filter_w}($self, \$_[0]);	555	$self->{_tls_wbuf} .= $_[0];
		556
		557	&_dotls ($self);
467	} else {	558	} else {
468	$self->{wbuf} .= $_[0];	559	$self->{wbuf} .= $_[0];
469	$self->_drain_wbuf;	560	$self->_drain_wbuf;
470	}	561	}
471	}	562	}
…		…
488	=cut	579	=cut
489		580
490	register_write_type netstring => sub {	581	register_write_type netstring => sub {
491	my ($self, $string) = @_;	582	my ($self, $string) = @_;
492		583
493	sprintf "%d:%s,", (length $string), $string	584	(length $string) . ":$string,"
494	};	585	};
495		586
496	=item packstring => $format, $data	587	=item packstring => $format, $data
497		588
498	An octet string prefixed with an encoded length. The encoding C<$format>	589	An octet string prefixed with an encoded length. The encoding C<$format>
…		…
593	ways, the "simple" way, using only C<on_read> and the "complex" way, using	684	ways, the "simple" way, using only C<on_read> and the "complex" way, using
594	a queue.	685	a queue.
595		686
596	In the simple case, you just install an C<on_read> callback and whenever	687	In the simple case, you just install an C<on_read> callback and whenever
597	new data arrives, it will be called. You can then remove some data (if	688	new data arrives, it will be called. You can then remove some data (if
598	enough is there) from the read buffer (C<< $handle->rbuf >>) if you want	689	enough is there) from the read buffer (C<< $handle->rbuf >>). Or you cna
599	or not.	690	leave the data there if you want to accumulate more (e.g. when only a
		691	partial message has been received so far).
600		692
601	In the more complex case, you want to queue multiple callbacks. In this	693	In the more complex case, you want to queue multiple callbacks. In this
602	case, AnyEvent::Handle will call the first queued callback each time new	694	case, AnyEvent::Handle will call the first queued callback each time new
603	data arrives (also the first time it is queued) and removes it when it has	695	data arrives (also the first time it is queued) and removes it when it has
604	done its job (see C<push_read>, below).	696	done its job (see C<push_read>, below).
…		…
622	# handle xml	714	# handle xml
623	});	715	});
624	});	716	});
625	});	717	});
626		718
627	Example 2: Implement a client for a protocol that replies either with	719	Example 2: Implement a client for a protocol that replies either with "OK"
628	"OK" and another line or "ERROR" for one request, and 64 bytes for the	720	and another line or "ERROR" for the first request that is sent, and 64
629	second request. Due tot he availability of a full queue, we can just	721	bytes for the second request. Due to the availability of a queue, we can
630	pipeline sending both requests and manipulate the queue as necessary in	722	just pipeline sending both requests and manipulate the queue as necessary
631	the callbacks:	723	in the callbacks.
632		724
633	# request one	725	When the first callback is called and sees an "OK" response, it will
		726	C<unshift> another line-read. This line-read will be queued I<before> the
		727	64-byte chunk callback.
		728
		729	# request one, returns either "OK + extra line" or "ERROR"
634	$handle->push_write ("request 1\015\012");	730	$handle->push_write ("request 1\015\012");
635		731
636	# we expect "ERROR" or "OK" as response, so push a line read	732	# we expect "ERROR" or "OK" as response, so push a line read
637	$handle->push_read (line => sub {	733	$handle->push_read (line => sub {
638	# if we got an "OK", we have to _prepend_ another line,	734	# if we got an "OK", we have to _prepend_ another line,
…		…
645	...	741	...
646	});	742	});
647	}	743	}
648	});	744	});
649		745
650	# request two	746	# request two, simply returns 64 octets
651	$handle->push_write ("request 2\015\012");	747	$handle->push_write ("request 2\015\012");
652		748
653	# simply read 64 bytes, always	749	# simply read 64 bytes, always
654	$handle->push_read (chunk => 64, sub {	750	$handle->push_read (chunk => 64, sub {
655	my $response = $_[1];	751	my $response = $_[1];
…		…
667		763
668	if (	764	if (
669	defined $self->{rbuf_max}	765	defined $self->{rbuf_max}
670	&& $self->{rbuf_max} < length $self->{rbuf}	766	&& $self->{rbuf_max} < length $self->{rbuf}
671	) {	767	) {
672	return $self->_error (&Errno::ENOSPC, 1);	768	$self->_error (&Errno::ENOSPC, 1), return;
673	}	769	}
674		770
675	while () {	771	while () {
676	no strict 'refs';
677
678	my $len = length $self->{rbuf};	772	my $len = length $self->{rbuf};
679		773
680	if (my $cb = shift @{ $self->{_queue} }) {	774	if (my $cb = shift @{ $self->{_queue} }) {
681	unless ($cb->($self)) {	775	unless ($cb->($self)) {
682	if ($self->{_eof}) {	776	if ($self->{_eof}) {
683	# no progress can be made (not enough data and no data forthcoming)	777	# no progress can be made (not enough data and no data forthcoming)
684	$self->_error (&Errno::EPIPE, 1), last;	778	$self->_error (&Errno::EPIPE, 1), return;
685	}	779	}
686		780
687	unshift @{ $self->{_queue} }, $cb;	781	unshift @{ $self->{_queue} }, $cb;
688	last;	782	last;
689	}	783	}
…		…
697	&& !@{ $self->{_queue} } # and the queue is still empty	791	&& !@{ $self->{_queue} } # and the queue is still empty
698	&& $self->{on_read} # but we still have on_read	792	&& $self->{on_read} # but we still have on_read
699	) {	793	) {
700	# no further data will arrive	794	# no further data will arrive
701	# so no progress can be made	795	# so no progress can be made
702	$self->_error (&Errno::EPIPE, 1), last	796	$self->_error (&Errno::EPIPE, 1), return
703	if $self->{_eof};	797	if $self->{_eof};
704		798
705	last; # more data might arrive	799	last; # more data might arrive
706	}	800	}
707	} else {	801	} else {
708	# read side becomes idle	802	# read side becomes idle
709	delete $self->{_rw};	803	delete $self->{_rw} unless $self->{tls};
710	last;	804	last;
711	}	805	}
712	}	806	}
713		807
		808	if ($self->{_eof}) {
		809	if ($self->{on_eof}) {
714	$self->{on_eof}($self)	810	$self->{on_eof}($self)
715	if $self->{_eof} && $self->{on_eof};	811	} else {
		812	$self->_error (0, 1);
		813	}
		814	}
716		815
717	# may need to restart read watcher	816	# may need to restart read watcher
718	unless ($self->{_rw}) {	817	unless ($self->{_rw}) {
719	$self->start_read	818	$self->start_read
720	if $self->{on_read} \|\| @{ $self->{_queue} };	819	if $self->{on_read} \|\| @{ $self->{_queue} };
…		…
846	$cb->($_[0], substr $_[0]{rbuf}, 0, $len, "");	945	$cb->($_[0], substr $_[0]{rbuf}, 0, $len, "");
847	1	946	1
848	}	947	}
849	};	948	};
850		949
851	# compatibility with older API
852	sub push_read_chunk {
853	$_[0]->push_read (chunk => $_[1], $_[2]);
854	}
855
856	sub unshift_read_chunk {
857	$_[0]->unshift_read (chunk => $_[1], $_[2]);
858	}
859
860	=item line => [$eol, ]$cb->($handle, $line, $eol)	950	=item line => [$eol, ]$cb->($handle, $line, $eol)
861		951
862	The callback will be called only once a full line (including the end of	952	The callback will be called only once a full line (including the end of
863	line marker, C<$eol>) has been read. This line (excluding the end of line	953	line marker, C<$eol>) has been read. This line (excluding the end of line
864	marker) will be passed to the callback as second argument (C<$line>), and	954	marker) will be passed to the callback as second argument (C<$line>), and
…		…
879	=cut	969	=cut
880		970
881	register_read_type line => sub {	971	register_read_type line => sub {
882	my ($self, $cb, $eol) = @_;	972	my ($self, $cb, $eol) = @_;
883		973
884	$eol = qr\|(\015?\012)\| if @_ < 3;	974	if (@_ < 3) {
		975	# this is more than twice as fast as the generic code below
		976	sub {
		977	$_[0]{rbuf} =~ s/^([^\015\012]*)(\015?\012)// or return;
		978
		979	$cb->($_[0], $1, $2);
		980	1
		981	}
		982	} else {
885	$eol = quotemeta $eol unless ref $eol;	983	$eol = quotemeta $eol unless ref $eol;
886	$eol = qr\|^(.*?)($eol)\|s;	984	$eol = qr\|^(.*?)($eol)\|s;
887		985
888	sub {	986	sub {
889	$_[0]{rbuf} =~ s/$eol// or return;	987	$_[0]{rbuf} =~ s/$eol// or return;
890		988
891	$cb->($_[0], $1, $2);	989	$cb->($_[0], $1, $2);
		990	1
892	1	991	}
893	}	992	}
894	};	993	};
895
896	# compatibility with older API
897	sub push_read_line {
898	my $self = shift;
899	$self->push_read (line => @_);
900	}
901
902	sub unshift_read_line {
903	my $self = shift;
904	$self->unshift_read (line => @_);
905	}
906		994
907	=item regex => $accept[, $reject[, $skip], $cb->($handle, $data)	995	=item regex => $accept[, $reject[, $skip], $cb->($handle, $data)
908		996
909	Makes a regex match against the regex object C<$accept> and returns	997	Makes a regex match against the regex object C<$accept> and returns
910	everything up to and including the match.	998	everything up to and including the match.
…		…
1015	An octet string prefixed with an encoded length. The encoding C<$format>	1103	An octet string prefixed with an encoded length. The encoding C<$format>
1016	uses the same format as a Perl C<pack> format, but must specify a single	1104	uses the same format as a Perl C<pack> format, but must specify a single
1017	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an	1105	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an
1018	optional C<!>, C<< < >> or C<< > >> modifier).	1106	optional C<!>, C<< < >> or C<< > >> modifier).
1019		1107
1020	DNS over TCP uses a prefix of C<n>, EPP uses a prefix of C<N>.	1108	For example, DNS over TCP uses a prefix of C<n> (2 octet network order),
		1109	EPP uses a prefix of C<N> (4 octtes).
1021		1110
1022	Example: read a block of data prefixed by its length in BER-encoded	1111	Example: read a block of data prefixed by its length in BER-encoded
1023	format (very efficient).	1112	format (very efficient).
1024		1113
1025	$handle->push_read (packstring => "w", sub {	1114	$handle->push_read (packstring => "w", sub {
…		…
1031	register_read_type packstring => sub {	1120	register_read_type packstring => sub {
1032	my ($self, $cb, $format) = @_;	1121	my ($self, $cb, $format) = @_;
1033		1122
1034	sub {	1123	sub {
1035	# when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method	1124	# when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method
1036	defined (my $len = eval { unpack $format, $_[0]->{rbuf} })	1125	defined (my $len = eval { unpack $format, $_[0]{rbuf} })
1037	or return;	1126	or return;
1038		1127
		1128	$format = length pack $format, $len;
		1129
		1130	# bypass unshift if we already have the remaining chunk
		1131	if ($format + $len <= length $_[0]{rbuf}) {
		1132	my $data = substr $_[0]{rbuf}, $format, $len;
		1133	substr $_[0]{rbuf}, 0, $format + $len, "";
		1134	$cb->($_[0], $data);
		1135	} else {
1039	# remove prefix	1136	# remove prefix
1040	substr $_[0]->{rbuf}, 0, (length pack $format, $len), "";	1137	substr $_[0]{rbuf}, 0, $format, "";
1041		1138
1042	# read rest	1139	# read remaining chunk
1043	$_[0]->unshift_read (chunk => $len, $cb);	1140	$_[0]->unshift_read (chunk => $len, $cb);
		1141	}
1044		1142
1045	1	1143	1
1046	}	1144	}
1047	};	1145	};
1048		1146
…		…
1105		1203
1106	require Storable;	1204	require Storable;
1107		1205
1108	sub {	1206	sub {
1109	# when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method	1207	# when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method
1110	defined (my $len = eval { unpack "w", $_[0]->{rbuf} })	1208	defined (my $len = eval { unpack "w", $_[0]{rbuf} })
1111	or return;	1209	or return;
1112		1210
		1211	my $format = length pack "w", $len;
		1212
		1213	# bypass unshift if we already have the remaining chunk
		1214	if ($format + $len <= length $_[0]{rbuf}) {
		1215	my $data = substr $_[0]{rbuf}, $format, $len;
		1216	substr $_[0]{rbuf}, 0, $format + $len, "";
		1217	$cb->($_[0], Storable::thaw ($data));
		1218	} else {
1113	# remove prefix	1219	# remove prefix
1114	substr $_[0]->{rbuf}, 0, (length pack "w", $len), "";	1220	substr $_[0]{rbuf}, 0, $format, "";
1115		1221
1116	# read rest	1222	# read remaining chunk
1117	$_[0]->unshift_read (chunk => $len, sub {	1223	$_[0]->unshift_read (chunk => $len, sub {
1118	if (my $ref = eval { Storable::thaw ($_[1]) }) {	1224	if (my $ref = eval { Storable::thaw ($_[1]) }) {
1119	$cb->($_[0], $ref);	1225	$cb->($_[0], $ref);
1120	} else {	1226	} else {
1121	$self->_error (&Errno::EBADMSG);	1227	$self->_error (&Errno::EBADMSG);
		1228	}
1122	}	1229	});
1123	});	1230	}
		1231
		1232	1
1124	}	1233	}
1125	};	1234	};
1126		1235
1127	=back	1236	=back
1128		1237
…		…
1158	Note that AnyEvent::Handle will automatically C<start_read> for you when	1267	Note that AnyEvent::Handle will automatically C<start_read> for you when
1159	you change the C<on_read> callback or push/unshift a read callback, and it	1268	you change the C<on_read> callback or push/unshift a read callback, and it
1160	will automatically C<stop_read> for you when neither C<on_read> is set nor	1269	will automatically C<stop_read> for you when neither C<on_read> is set nor
1161	there are any read requests in the queue.	1270	there are any read requests in the queue.
1162		1271
		1272	These methods will have no effect when in TLS mode (as TLS doesn't support
		1273	half-duplex connections).
		1274
1163	=cut	1275	=cut
1164		1276
1165	sub stop_read {	1277	sub stop_read {
1166	my ($self) = @_;	1278	my ($self) = @_;
1167		1279
1168	delete $self->{_rw};	1280	delete $self->{_rw} unless $self->{tls};
1169	}	1281	}
1170		1282
1171	sub start_read {	1283	sub start_read {
1172	my ($self) = @_;	1284	my ($self) = @_;
1173		1285
1174	unless ($self->{_rw} \|\| $self->{_eof}) {	1286	unless ($self->{_rw} \|\| $self->{_eof}) {
1175	Scalar::Util::weaken $self;	1287	Scalar::Util::weaken $self;
1176		1288
1177	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {	1289	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {
1178	my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf};	1290	my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});
1179	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} \|\| 8192, length $$rbuf;	1291	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} \|\| 8192, length $$rbuf;
1180		1292
1181	if ($len > 0) {	1293	if ($len > 0) {
1182	$self->{_activity} = AnyEvent->now;	1294	$self->{_activity} = AnyEvent->now;
1183		1295
1184	$self->{filter_r}	1296	if ($self->{tls}) {
1185	? $self->{filter_r}($self, $rbuf)	1297	Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);
1186	: $self->{_in_drain} \|\| $self->_drain_rbuf;	1298
		1299	&_dotls ($self);
		1300	} else {
		1301	$self->_drain_rbuf unless $self->{_in_drain};
		1302	}
1187		1303
1188	} elsif (defined $len) {	1304	} elsif (defined $len) {
1189	delete $self->{_rw};	1305	delete $self->{_rw};
1190	$self->{_eof} = 1;	1306	$self->{_eof} = 1;
1191	$self->_drain_rbuf unless $self->{_in_drain};	1307	$self->_drain_rbuf unless $self->{_in_drain};
…		…
1195	}	1311	}
1196	});	1312	});
1197	}	1313	}
1198	}	1314	}
1199		1315
		1316	# poll the write BIO and send the data if applicable
1200	sub _dotls {	1317	sub _dotls {
1201	my ($self) = @_;	1318	my ($self) = @_;
1202		1319
1203	my $buf;	1320	my $tmp;
1204		1321
1205	if (length $self->{_tls_wbuf}) {	1322	if (length $self->{_tls_wbuf}) {
1206	while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {	1323	while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {
1207	substr $self->{_tls_wbuf}, 0, $len, "";	1324	substr $self->{_tls_wbuf}, 0, $tmp, "";
1208	}	1325	}
1209	}	1326	}
1210		1327
1211	if (length ($buf = Net::SSLeay::BIO_read ($self->{_wbio}))) {
1212	$self->{wbuf} .= $buf;
1213	$self->_drain_wbuf;
1214	}
1215
1216	while (defined ($buf = Net::SSLeay::read ($self->{tls}))) {	1328	while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) {
1217	if (length $buf) {	1329	unless (length $tmp) {
1218	$self->{rbuf} .= $buf;
1219	$self->_drain_rbuf unless $self->{_in_drain};
1220	} else {
1221	# let's treat SSL-eof as we treat normal EOF	1330	# let's treat SSL-eof as we treat normal EOF
		1331	delete $self->{_rw};
1222	$self->{_eof} = 1;	1332	$self->{_eof} = 1;
1223	$self->_shutdown;	1333	&_freetls;
1224	return;
1225	}	1334	}
1226	}
1227		1335
		1336	$self->{rbuf} .= $tmp;
		1337	$self->_drain_rbuf unless $self->{_in_drain};
		1338	$self->{tls} or return; # tls session might have gone away in callback
		1339	}
		1340
1228	my $err = Net::SSLeay::get_error ($self->{tls}, -1);	1341	$tmp = Net::SSLeay::get_error ($self->{tls}, -1);
1229		1342
1230	if ($err!= Net::SSLeay::ERROR_WANT_READ ()) {	1343	if ($tmp != Net::SSLeay::ERROR_WANT_READ ()) {
1231	if ($err == Net::SSLeay::ERROR_SYSCALL ()) {	1344	if ($tmp == Net::SSLeay::ERROR_SYSCALL ()) {
1232	return $self->_error ($!, 1);	1345	return $self->_error ($!, 1);
1233	} elsif ($err == Net::SSLeay::ERROR_SSL ()) {	1346	} elsif ($tmp == Net::SSLeay::ERROR_SSL ()) {
1234	return $self->_error (&Errno::EIO, 1);	1347	return $self->_error (&Errno::EIO, 1);
1235	}	1348	}
1236		1349
1237	# all others are fine for our purposes	1350	# all other errors are fine for our purposes
		1351	}
		1352
		1353	while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) {
		1354	$self->{wbuf} .= $tmp;
		1355	$self->_drain_wbuf;
1238	}	1356	}
1239	}	1357	}
1240		1358
1241	=item $handle->starttls ($tls[, $tls_ctx])	1359	=item $handle->starttls ($tls[, $tls_ctx])
1242		1360
…		…
1252		1370
1253	The TLS connection object will end up in C<< $handle->{tls} >> after this	1371	The TLS connection object will end up in C<< $handle->{tls} >> after this
1254	call and can be used or changed to your liking. Note that the handshake	1372	call and can be used or changed to your liking. Note that the handshake
1255	might have already started when this function returns.	1373	might have already started when this function returns.
1256		1374
		1375	If it an error to start a TLS handshake more than once per
		1376	AnyEvent::Handle object (this is due to bugs in OpenSSL).
		1377
1257	=cut	1378	=cut
1258		1379
1259	sub starttls {	1380	sub starttls {
1260	my ($self, $ssl, $ctx) = @_;	1381	my ($self, $ssl, $ctx) = @_;
1261		1382
1262	$self->stoptls;	1383	require Net::SSLeay;
1263		1384
		1385	Carp::croak "it is an error to call starttls more than once on an AnyEvent::Handle object"
		1386	if $self->{tls};
		1387
1264	if ($ssl eq "accept") {	1388	if ($ssl eq "accept") {
1265	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());	1389	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());
1266	Net::SSLeay::set_accept_state ($ssl);	1390	Net::SSLeay::set_accept_state ($ssl);
1267	} elsif ($ssl eq "connect") {	1391	} elsif ($ssl eq "connect") {
1268	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());	1392	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());
…		…
1274	# basically, this is deep magic (because SSL_read should have the same issues)	1398	# basically, this is deep magic (because SSL_read should have the same issues)
1275	# but the openssl maintainers basically said: "trust us, it just works".	1399	# but the openssl maintainers basically said: "trust us, it just works".
1276	# (unfortunately, we have to hardcode constants because the abysmally misdesigned	1400	# (unfortunately, we have to hardcode constants because the abysmally misdesigned
1277	# and mismaintained ssleay-module doesn't even offer them).	1401	# and mismaintained ssleay-module doesn't even offer them).
1278	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html	1402	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html
		1403	#
		1404	# in short: this is a mess.
		1405	#
		1406	# note that we do not try to keep the length constant between writes as we are required to do.
		1407	# we assume that most (but not all) of this insanity only applies to non-blocking cases,
		1408	# and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to
		1409	# have identity issues in that area.
1279	Net::SSLeay::CTX_set_mode ($self->{tls},	1410	Net::SSLeay::CTX_set_mode ($self->{tls},
1280	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } \|\| 1)	1411	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } \|\| 1)
1281	\| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } \|\| 2));	1412	\| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } \|\| 2));
1282		1413
1283	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1414	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1284	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1415	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1285		1416
1286	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});	1417	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});
1287		1418
1288	$self->{filter_w} = sub {	1419	&_dotls; # need to trigger the initial handshake
1289	$_[0]{_tls_wbuf} .= ${$_[1]};	1420	$self->start_read; # make sure we actually do read
1290	&_dotls;
1291	};
1292	$self->{filter_r} = sub {
1293	Net::SSLeay::BIO_write ($_[0]{_rbio}, ${$_[1]});
1294	&_dotls;
1295	};
1296	}	1421	}
1297		1422
1298	=item $handle->stoptls	1423	=item $handle->stoptls
1299		1424
1300	Destroys the SSL connection, if any. Partial read or write data will be	1425	Shuts down the SSL connection - this makes a proper EOF handshake by
1301	lost.	1426	sending a close notify to the other side, but since OpenSSL doesn't
		1427	support non-blocking shut downs, it is not possible to re-use the stream
		1428	afterwards.
1302		1429
1303	=cut	1430	=cut
1304		1431
1305	sub stoptls {	1432	sub stoptls {
1306	my ($self) = @_;	1433	my ($self) = @_;
1307		1434
		1435	if ($self->{tls}) {
		1436	Net::SSLeay::shutdown ($self->{tls});
		1437
		1438	&_dotls;
		1439
		1440	# we don't give a shit. no, we do, but we can't. no...
		1441	# we, we... have to use openssl :/
		1442	&_freetls;
		1443	}
		1444	}
		1445
		1446	sub _freetls {
		1447	my ($self) = @_;
		1448
		1449	return unless $self->{tls};
		1450
1308	Net::SSLeay::free (delete $self->{tls}) if $self->{tls};	1451	Net::SSLeay::free (delete $self->{tls});
1309		1452
1310	delete $self->{_rbio};	1453	delete @$self{qw(_rbio _wbio _tls_wbuf)};
1311	delete $self->{_wbio};
1312	delete $self->{_tls_wbuf};
1313	delete $self->{filter_r};
1314	delete $self->{filter_w};
1315	}	1454	}
1316		1455
1317	sub DESTROY {	1456	sub DESTROY {
1318	my $self = shift;	1457	my $self = shift;
1319		1458
1320	$self->stoptls;	1459	&_freetls;
1321		1460
1322	my $linger = exists $self->{linger} ? $self->{linger} : 3600;	1461	my $linger = exists $self->{linger} ? $self->{linger} : 3600;
1323		1462
1324	if ($linger && length $self->{wbuf}) {	1463	if ($linger && length $self->{wbuf}) {
1325	my $fh = delete $self->{fh};	1464	my $fh = delete $self->{fh};
…		…
1340	@linger = ();	1479	@linger = ();
1341	});	1480	});
1342	}	1481	}
1343	}	1482	}
1344		1483
		1484	=item $handle->destroy
		1485
		1486	Shuts down the handle object as much as possible - this call ensures that
		1487	no further callbacks will be invoked and resources will be freed as much
		1488	as possible. You must not call any methods on the object afterwards.
		1489
		1490	Normally, you can just "forget" any references to an AnyEvent::Handle
		1491	object and it will simply shut down. This works in fatal error and EOF
		1492	callbacks, as well as code outside. It does I<NOT> work in a read or write
		1493	callback, so when you want to destroy the AnyEvent::Handle object from
		1494	within such an callback. You I<MUST> call C<< ->destroy >> explicitly in
		1495	that case.
		1496
		1497	The handle might still linger in the background and write out remaining
		1498	data, as specified by the C<linger> option, however.
		1499
		1500	=cut
		1501
		1502	sub destroy {
		1503	my ($self) = @_;
		1504
		1505	$self->DESTROY;
		1506	%$self = ();
		1507	}
		1508
1345	=item AnyEvent::Handle::TLS_CTX	1509	=item AnyEvent::Handle::TLS_CTX
1346		1510
1347	This function creates and returns the Net::SSLeay::CTX object used by	1511	This function creates and returns the Net::SSLeay::CTX object used by
1348	default for TLS mode.	1512	default for TLS mode.
1349		1513
…		…
1377	}	1541	}
1378	}	1542	}
1379		1543
1380	=back	1544	=back
1381		1545
		1546
		1547	=head1 NONFREQUENTLY ASKED QUESTIONS
		1548
		1549	=over 4
		1550
		1551	=item I C<undef> the AnyEvent::Handle reference inside my callback and
		1552	still get further invocations!
		1553
		1554	That's because AnyEvent::Handle keeps a reference to itself when handling
		1555	read or write callbacks.
		1556
		1557	It is only safe to "forget" the reference inside EOF or error callbacks,
		1558	from within all other callbacks, you need to explicitly call the C<<
		1559	->destroy >> method.
		1560
		1561	=item I get different callback invocations in TLS mode/Why can't I pause
		1562	reading?
		1563
		1564	Unlike, say, TCP, TLS connections do not consist of two independent
		1565	communication channels, one for each direction. Or put differently. The
		1566	read and write directions are not independent of each other: you cannot
		1567	write data unless you are also prepared to read, and vice versa.
		1568
		1569	This can mean than, in TLS mode, you might get C<on_error> or C<on_eof>
		1570	callback invocations when you are not expecting any read data - the reason
		1571	is that AnyEvent::Handle always reads in TLS mode.
		1572
		1573	During the connection, you have to make sure that you always have a
		1574	non-empty read-queue, or an C<on_read> watcher. At the end of the
		1575	connection (or when you no longer want to use it) you can call the
		1576	C<destroy> method.
		1577
		1578	=item How do I read data until the other side closes the connection?
		1579
		1580	If you just want to read your data into a perl scalar, the easiest way
		1581	to achieve this is by setting an C<on_read> callback that does nothing,
		1582	clearing the C<on_eof> callback and in the C<on_error> callback, the data
		1583	will be in C<$_[0]{rbuf}>:
		1584
		1585	$handle->on_read (sub { });
		1586	$handle->on_eof (undef);
		1587	$handle->on_error (sub {
		1588	my $data = delete $_[0]{rbuf};
		1589	undef $handle;
		1590	});
		1591
		1592	The reason to use C<on_error> is that TCP connections, due to latencies
		1593	and packets loss, might get closed quite violently with an error, when in
		1594	fact, all data has been received.
		1595
		1596	It is usually better to use acknowledgements when transferring data,
		1597	to make sure the other side hasn't just died and you got the data
		1598	intact. This is also one reason why so many internet protocols have an
		1599	explicit QUIT command.
		1600
		1601	=item I don't want to destroy the handle too early - how do I wait until
		1602	all data has been written?
		1603
		1604	After writing your last bits of data, set the C<on_drain> callback
		1605	and destroy the handle in there - with the default setting of
		1606	C<low_water_mark> this will be called precisely when all data has been
		1607	written to the socket:
		1608
		1609	$handle->push_write (...);
		1610	$handle->on_drain (sub {
		1611	warn "all data submitted to the kernel\n";
		1612	undef $handle;
		1613	});
		1614
		1615	=back
		1616
		1617
1382	=head1 SUBCLASSING AnyEvent::Handle	1618	=head1 SUBCLASSING AnyEvent::Handle
1383		1619
1384	In many cases, you might want to subclass AnyEvent::Handle.	1620	In many cases, you might want to subclass AnyEvent::Handle.
1385		1621
1386	To make this easier, a given version of AnyEvent::Handle uses these	1622	To make this easier, a given version of AnyEvent::Handle uses these
…		…
1389	=over 4	1625	=over 4
1390		1626
1391	=item * all constructor arguments become object members.	1627	=item * all constructor arguments become object members.
1392		1628
1393	At least initially, when you pass a C<tls>-argument to the constructor it	1629	At least initially, when you pass a C<tls>-argument to the constructor it
1394	will end up in C<< $handle->{tls} >>. Those members might be changes or	1630	will end up in C<< $handle->{tls} >>. Those members might be changed or
1395	mutated later on (for example C<tls> will hold the TLS connection object).	1631	mutated later on (for example C<tls> will hold the TLS connection object).
1396		1632
1397	=item * other object member names are prefixed with an C<_>.	1633	=item * other object member names are prefixed with an C<_>.
1398		1634
1399	All object members not explicitly documented (internal use) are prefixed	1635	All object members not explicitly documented (internal use) are prefixed

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Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents): Revision 1.68 by root, Fri Jun 6 15:35:30 2008 UTC vs. Revision 1.109 by root, Wed Jan 14 02:03:43 2009 UTC

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Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.68 by root, Fri Jun 6 15:35:30 2008 UTC vs.
Revision 1.109 by root, Wed Jan 14 02:03:43 2009 UTC