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

Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.67 by root, Fri Jun 6 15:33:10 2008 UTC vs.
Revision 1.107 by root, Wed Nov 26 06:40:47 2008 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 = 4.15;	19	our $VERSION = 4.33;
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
200	See the C<starttls> method if you need to start TLs negotiation later.	260	See the C<< ->starttls >> method for when need to start TLS negotiation later.
201		261
202	=item tls_ctx => $ssl_ctx	262	=item tls_ctx => $ssl_ctx
203		263
204	Use the given Net::SSLeay::CTX object to create the new TLS connection	264	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	265	(unless a connection object was specified directly). If this parameter is
206	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.	266	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.
207		267
208	=item json => JSON or JSON::XS object	268	=item json => JSON or JSON::XS object
209		269
210	This is the json coder object used by the C<json> read and write types.	270	This is the json coder object used by the C<json> read and write types.
211		271
212	If you don't supply it, then AnyEvent::Handle will create and use a	272	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.	273	suitable one (on demand), which will write and expect UTF-8 encoded JSON
		274	texts.
214		275
215	Note that you are responsible to depend on the JSON module if you want to	276	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.	277	use this functionality, as AnyEvent does not have a dependency itself.
217		278
218	=item filter_r => $cb
219
220	=item filter_w => $cb
221
222	These exist, but are undocumented at this time.
223
224	=back	279	=back
225		280
226	=cut	281	=cut
227		282
228	sub new {	283	sub new {
…		…
232		287
233	$self->{fh} or Carp::croak "mandatory argument fh is missing";	288	$self->{fh} or Carp::croak "mandatory argument fh is missing";
234		289
235	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;	290	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;
236		291
237	if ($self->{tls}) {
238	require Net::SSLeay;
239	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx});	292	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx})
240	}	293	if $self->{tls};
241		294
242	$self->{_activity} = AnyEvent->now;	295	$self->{_activity} = AnyEvent->now;
243	$self->_timeout;	296	$self->_timeout;
244		297
245	$self->on_drain (delete $self->{on_drain}) if $self->{on_drain};	298	$self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain};
		299	$self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay};
246		300
247	$self->start_read	301	$self->start_read
248	if $self->{on_read};	302	if $self->{on_read};
249		303
250	$self	304	$self
…		…
256	delete $self->{_tw};	310	delete $self->{_tw};
257	delete $self->{_rw};	311	delete $self->{_rw};
258	delete $self->{_ww};	312	delete $self->{_ww};
259	delete $self->{fh};	313	delete $self->{fh};
260		314
261	$self->stoptls;	315	&_freetls;
		316
		317	delete $self->{on_read};
		318	delete $self->{_queue};
262	}	319	}
263		320
264	sub _error {	321	sub _error {
265	my ($self, $errno, $fatal) = @_;	322	my ($self, $errno, $fatal) = @_;
266		323
…		…
269		326
270	$! = $errno;	327	$! = $errno;
271		328
272	if ($self->{on_error}) {	329	if ($self->{on_error}) {
273	$self->{on_error}($self, $fatal);	330	$self->{on_error}($self, $fatal);
274	} else {	331	} elsif ($self->{fh}) {
275	Carp::croak "AnyEvent::Handle uncaught error: $!";	332	Carp::croak "AnyEvent::Handle uncaught error: $!";
276	}	333	}
277	}	334	}
278		335
279	=item $fh = $handle->fh	336	=item $fh = $handle->fh
280		337
281	This method returns the file handle of the L<AnyEvent::Handle> object.	338	This method returns the file handle used to create the L<AnyEvent::Handle> object.
282		339
283	=cut	340	=cut
284		341
285	sub fh { $_[0]{fh} }	342	sub fh { $_[0]{fh} }
286		343
…		…
304	$_[0]{on_eof} = $_[1];	361	$_[0]{on_eof} = $_[1];
305	}	362	}
306		363
307	=item $handle->on_timeout ($cb)	364	=item $handle->on_timeout ($cb)
308		365
309	Replace the current C<on_timeout> callback, or disables the callback	366	Replace the current C<on_timeout> callback, or disables the callback (but
310	(but not the timeout) if C<$cb> = C<undef>. See C<timeout> constructor	367	not the timeout) if C<$cb> = C<undef>. See the C<timeout> constructor
311	argument.	368	argument and method.
312		369
313	=cut	370	=cut
314		371
315	sub on_timeout {	372	sub on_timeout {
316	$_[0]{on_timeout} = $_[1];	373	$_[0]{on_timeout} = $_[1];
		374	}
		375
		376	=item $handle->autocork ($boolean)
		377
		378	Enables or disables the current autocork behaviour (see C<autocork>
		379	constructor argument). Changes will only take effect on the next write.
		380
		381	=cut
		382
		383	sub autocork {
		384	$_[0]{autocork} = $_[1];
		385	}
		386
		387	=item $handle->no_delay ($boolean)
		388
		389	Enables or disables the C<no_delay> setting (see constructor argument of
		390	the same name for details).
		391
		392	=cut
		393
		394	sub no_delay {
		395	$_[0]{no_delay} = $_[1];
		396
		397	eval {
		398	local $SIG{__DIE__};
		399	setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1];
		400	};
317	}	401	}
318		402
319	#############################################################################	403	#############################################################################
320		404
321	=item $handle->timeout ($seconds)	405	=item $handle->timeout ($seconds)
…		…
399	my ($self, $cb) = @_;	483	my ($self, $cb) = @_;
400		484
401	$self->{on_drain} = $cb;	485	$self->{on_drain} = $cb;
402		486
403	$cb->($self)	487	$cb->($self)
404	if $cb && $self->{low_water_mark} >= length $self->{wbuf};	488	if $cb && $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf});
405	}	489	}
406		490
407	=item $handle->push_write ($data)	491	=item $handle->push_write ($data)
408		492
409	Queues the given scalar to be written. You can push as much data as you	493	Queues the given scalar to be written. You can push as much data as you
…		…
426	substr $self->{wbuf}, 0, $len, "";	510	substr $self->{wbuf}, 0, $len, "";
427		511
428	$self->{_activity} = AnyEvent->now;	512	$self->{_activity} = AnyEvent->now;
429		513
430	$self->{on_drain}($self)	514	$self->{on_drain}($self)
431	if $self->{low_water_mark} >= length $self->{wbuf}	515	if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf})
432	&& $self->{on_drain};	516	&& $self->{on_drain};
433		517
434	delete $self->{_ww} unless length $self->{wbuf};	518	delete $self->{_ww} unless length $self->{wbuf};
435	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	519	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
436	$self->_error ($!, 1);	520	$self->_error ($!, 1);
437	}	521	}
438	};	522	};
439		523
440	# try to write data immediately	524	# try to write data immediately
441	$cb->();	525	$cb->() unless $self->{autocork};
442		526
443	# if still data left in wbuf, we need to poll	527	# if still data left in wbuf, we need to poll
444	$self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb)	528	$self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb)
445	if length $self->{wbuf};	529	if length $self->{wbuf};
446	};	530	};
…		…
460		544
461	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")	545	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")
462	->($self, @_);	546	->($self, @_);
463	}	547	}
464		548
465	if ($self->{filter_w}) {	549	if ($self->{tls}) {
466	$self->{filter_w}($self, \$_[0]);	550	$self->{_tls_wbuf} .= $_[0];
		551
		552	&_dotls ($self);
467	} else {	553	} else {
468	$self->{wbuf} .= $_[0];	554	$self->{wbuf} .= $_[0];
469	$self->_drain_wbuf;	555	$self->_drain_wbuf;
470	}	556	}
471	}	557	}
…		…
488	=cut	574	=cut
489		575
490	register_write_type netstring => sub {	576	register_write_type netstring => sub {
491	my ($self, $string) = @_;	577	my ($self, $string) = @_;
492		578
493	sprintf "%d:%s,", (length $string), $string	579	(length $string) . ":$string,"
494	};	580	};
495		581
496	=item packstring => $format, $data	582	=item packstring => $format, $data
497		583
498	An octet string prefixed with an encoded length. The encoding C<$format>	584	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	679	ways, the "simple" way, using only C<on_read> and the "complex" way, using
594	a queue.	680	a queue.
595		681
596	In the simple case, you just install an C<on_read> callback and whenever	682	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	683	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	684	enough is there) from the read buffer (C<< $handle->rbuf >>). Or you cna
599	or not.	685	leave the data there if you want to accumulate more (e.g. when only a
		686	partial message has been received so far).
600		687
601	In the more complex case, you want to queue multiple callbacks. In this	688	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	689	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	690	data arrives (also the first time it is queued) and removes it when it has
604	done its job (see C<push_read>, below).	691	done its job (see C<push_read>, below).
…		…
622	# handle xml	709	# handle xml
623	});	710	});
624	});	711	});
625	});	712	});
626		713
627	Example 2: Implement a client for a protocol that replies either with	714	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	715	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	716	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	717	just pipeline sending both requests and manipulate the queue as necessary
631	the callbacks:	718	in the callbacks.
632		719
633	# request one	720	When the first callback is called and sees an "OK" response, it will
		721	C<unshift> another line-read. This line-read will be queued I<before> the
		722	64-byte chunk callback.
		723
		724	# request one, returns either "OK + extra line" or "ERROR"
634	$handle->push_write ("request 1\015\012");	725	$handle->push_write ("request 1\015\012");
635		726
636	# we expect "ERROR" or "OK" as response, so push a line read	727	# we expect "ERROR" or "OK" as response, so push a line read
637	$handle->push_read (line => sub {	728	$handle->push_read (line => sub {
638	# if we got an "OK", we have to _prepend_ another line,	729	# if we got an "OK", we have to _prepend_ another line,
…		…
645	...	736	...
646	});	737	});
647	}	738	}
648	});	739	});
649		740
650	# request two	741	# request two, simply returns 64 octets
651	$handle->push_write ("request 2\015\012");	742	$handle->push_write ("request 2\015\012");
652		743
653	# simply read 64 bytes, always	744	# simply read 64 bytes, always
654	$handle->push_read (chunk => 64, sub {	745	$handle->push_read (chunk => 64, sub {
655	my $response = $_[1];	746	my $response = $_[1];
…		…
667		758
668	if (	759	if (
669	defined $self->{rbuf_max}	760	defined $self->{rbuf_max}
670	&& $self->{rbuf_max} < length $self->{rbuf}	761	&& $self->{rbuf_max} < length $self->{rbuf}
671	) {	762	) {
672	return $self->_error (&Errno::ENOSPC, 1);	763	$self->_error (&Errno::ENOSPC, 1), return;
673	}	764	}
674		765
675	while () {	766	while () {
676	no strict 'refs';
677
678	my $len = length $self->{rbuf};	767	my $len = length $self->{rbuf};
679		768
680	if (my $cb = shift @{ $self->{_queue} }) {	769	if (my $cb = shift @{ $self->{_queue} }) {
681	unless ($cb->($self)) {	770	unless ($cb->($self)) {
682	if ($self->{_eof}) {	771	if ($self->{_eof}) {
683	# no progress can be made (not enough data and no data forthcoming)	772	# no progress can be made (not enough data and no data forthcoming)
684	$self->_error (&Errno::EPIPE, 1), last;	773	$self->_error (&Errno::EPIPE, 1), return;
685	}	774	}
686		775
687	unshift @{ $self->{_queue} }, $cb;	776	unshift @{ $self->{_queue} }, $cb;
688	last;	777	last;
689	}	778	}
…		…
697	&& !@{ $self->{_queue} } # and the queue is still empty	786	&& !@{ $self->{_queue} } # and the queue is still empty
698	&& $self->{on_read} # but we still have on_read	787	&& $self->{on_read} # but we still have on_read
699	) {	788	) {
700	# no further data will arrive	789	# no further data will arrive
701	# so no progress can be made	790	# so no progress can be made
702	$self->_error (&Errno::EPIPE, 1), last	791	$self->_error (&Errno::EPIPE, 1), return
703	if $self->{_eof};	792	if $self->{_eof};
704		793
705	last; # more data might arrive	794	last; # more data might arrive
706	}	795	}
707	} else {	796	} else {
708	# read side becomes idle	797	# read side becomes idle
709	delete $self->{_rw};	798	delete $self->{_rw} unless $self->{tls};
710	last;	799	last;
711	}	800	}
712	}	801	}
713		802
		803	if ($self->{_eof}) {
		804	if ($self->{on_eof}) {
714	$self->{on_eof}($self)	805	$self->{on_eof}($self)
715	if $self->{_eof} && $self->{on_eof};	806	} else {
		807	$self->_error (0, 1);
		808	}
		809	}
716		810
717	# may need to restart read watcher	811	# may need to restart read watcher
718	unless ($self->{_rw}) {	812	unless ($self->{_rw}) {
719	$self->start_read	813	$self->start_read
720	if $self->{on_read} \|\| @{ $self->{_queue} };	814	if $self->{on_read} \|\| @{ $self->{_queue} };
…		…
846	$cb->($_[0], substr $_[0]{rbuf}, 0, $len, "");	940	$cb->($_[0], substr $_[0]{rbuf}, 0, $len, "");
847	1	941	1
848	}	942	}
849	};	943	};
850		944
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, $eol)	945	=item line => [$eol, ]$cb->($handle, $line, $eol)
861		946
862	The callback will be called only once a full line (including the end of	947	The callback will be called only once a full line (including the end of
863	line marker, C<$eol>) has been read. This line (excluding the end of line	948	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	949	marker) will be passed to the callback as second argument (C<$line>), and
…		…
879	=cut	964	=cut
880		965
881	register_read_type line => sub {	966	register_read_type line => sub {
882	my ($self, $cb, $eol) = @_;	967	my ($self, $cb, $eol) = @_;
883		968
884	$eol = qr\|(\015?\012)\| if @_ < 3;	969	if (@_ < 3) {
		970	# this is more than twice as fast as the generic code below
		971	sub {
		972	$_[0]{rbuf} =~ s/^([^\015\012]*)(\015?\012)// or return;
		973
		974	$cb->($_[0], $1, $2);
		975	1
		976	}
		977	} else {
885	$eol = quotemeta $eol unless ref $eol;	978	$eol = quotemeta $eol unless ref $eol;
886	$eol = qr\|^(.*?)($eol)\|s;	979	$eol = qr\|^(.*?)($eol)\|s;
887		980
888	sub {	981	sub {
889	$_[0]{rbuf} =~ s/$eol// or return;	982	$_[0]{rbuf} =~ s/$eol// or return;
890		983
891	$cb->($_[0], $1, $2);	984	$cb->($_[0], $1, $2);
		985	1
892	1	986	}
893	}	987	}
894	};	988	};
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		989
907	=item regex => $accept[, $reject[, $skip], $cb->($handle, $data)	990	=item regex => $accept[, $reject[, $skip], $cb->($handle, $data)
908		991
909	Makes a regex match against the regex object C<$accept> and returns	992	Makes a regex match against the regex object C<$accept> and returns
910	everything up to and including the match.	993	everything up to and including the match.
…		…
1015	An octet string prefixed with an encoded length. The encoding C<$format>	1098	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	1099	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	1100	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an
1018	optional C<!>, C<< < >> or C<< > >> modifier).	1101	optional C<!>, C<< < >> or C<< > >> modifier).
1019		1102
1020	DNS over TCP uses a prefix of C<n>, EPP uses a prefix of C<N>.	1103	For example, DNS over TCP uses a prefix of C<n> (2 octet network order),
		1104	EPP uses a prefix of C<N> (4 octtes).
1021		1105
1022	Example: read a block of data prefixed by its length in BER-encoded	1106	Example: read a block of data prefixed by its length in BER-encoded
1023	format (very efficient).	1107	format (very efficient).
1024		1108
1025	$handle->push_read (packstring => "w", sub {	1109	$handle->push_read (packstring => "w", sub {
…		…
1031	register_read_type packstring => sub {	1115	register_read_type packstring => sub {
1032	my ($self, $cb, $format) = @_;	1116	my ($self, $cb, $format) = @_;
1033		1117
1034	sub {	1118	sub {
1035	# when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method	1119	# 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} })	1120	defined (my $len = eval { unpack $format, $_[0]{rbuf} })
1037	or return;	1121	or return;
1038		1122
		1123	$format = length pack $format, $len;
		1124
		1125	# bypass unshift if we already have the remaining chunk
		1126	if ($format + $len <= length $_[0]{rbuf}) {
		1127	my $data = substr $_[0]{rbuf}, $format, $len;
		1128	substr $_[0]{rbuf}, 0, $format + $len, "";
		1129	$cb->($_[0], $data);
		1130	} else {
1039	# remove prefix	1131	# remove prefix
1040	substr $_[0]->{rbuf}, 0, (length pack $format, $len), "";	1132	substr $_[0]{rbuf}, 0, $format, "";
1041		1133
1042	# read rest	1134	# read remaining chunk
1043	$_[0]->unshift_read (chunk => $len, $cb);	1135	$_[0]->unshift_read (chunk => $len, $cb);
		1136	}
1044		1137
1045	1	1138	1
1046	}	1139	}
1047	};	1140	};
1048		1141
…		…
1105		1198
1106	require Storable;	1199	require Storable;
1107		1200
1108	sub {	1201	sub {
1109	# when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method	1202	# 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} })	1203	defined (my $len = eval { unpack "w", $_[0]{rbuf} })
1111	or return;	1204	or return;
1112		1205
		1206	my $format = length pack "w", $len;
		1207
		1208	# bypass unshift if we already have the remaining chunk
		1209	if ($format + $len <= length $_[0]{rbuf}) {
		1210	my $data = substr $_[0]{rbuf}, $format, $len;
		1211	substr $_[0]{rbuf}, 0, $format + $len, "";
		1212	$cb->($_[0], Storable::thaw ($data));
		1213	} else {
1113	# remove prefix	1214	# remove prefix
1114	substr $_[0]->{rbuf}, 0, (length pack "w", $len), "";	1215	substr $_[0]{rbuf}, 0, $format, "";
1115		1216
1116	# read rest	1217	# read remaining chunk
1117	$_[0]->unshift_read (chunk => $len, sub {	1218	$_[0]->unshift_read (chunk => $len, sub {
1118	if (my $ref = eval { Storable::thaw ($_[1]) }) {	1219	if (my $ref = eval { Storable::thaw ($_[1]) }) {
1119	$cb->($_[0], $ref);	1220	$cb->($_[0], $ref);
1120	} else {	1221	} else {
1121	$self->_error (&Errno::EBADMSG);	1222	$self->_error (&Errno::EBADMSG);
		1223	}
1122	}	1224	});
1123	});	1225	}
		1226
		1227	1
1124	}	1228	}
1125	};	1229	};
1126		1230
1127	=back	1231	=back
1128		1232
…		…
1158	Note that AnyEvent::Handle will automatically C<start_read> for you when	1262	Note that AnyEvent::Handle will automatically C<start_read> for you when
1159	you change the C<on_read> callback or push/unshift a read callback, and it	1263	you change the C<on_read> callback or push/unshift a read callback, and it
1160	will automatically C<stop_read> for you when neither C<on_read> is set nor	1264	will automatically C<stop_read> for you when neither C<on_read> is set nor
1161	there are any read requests in the queue.	1265	there are any read requests in the queue.
1162		1266
		1267	These methods will have no effect when in TLS mode (as TLS doesn't support
		1268	half-duplex connections).
		1269
1163	=cut	1270	=cut
1164		1271
1165	sub stop_read {	1272	sub stop_read {
1166	my ($self) = @_;	1273	my ($self) = @_;
1167		1274
1168	delete $self->{_rw};	1275	delete $self->{_rw} unless $self->{tls};
1169	}	1276	}
1170		1277
1171	sub start_read {	1278	sub start_read {
1172	my ($self) = @_;	1279	my ($self) = @_;
1173		1280
1174	unless ($self->{_rw} \|\| $self->{_eof}) {	1281	unless ($self->{_rw} \|\| $self->{_eof}) {
1175	Scalar::Util::weaken $self;	1282	Scalar::Util::weaken $self;
1176		1283
1177	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {	1284	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {
1178	my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf};	1285	my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});
1179	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} \|\| 8192, length $$rbuf;	1286	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} \|\| 8192, length $$rbuf;
1180		1287
1181	if ($len > 0) {	1288	if ($len > 0) {
1182	$self->{_activity} = AnyEvent->now;	1289	$self->{_activity} = AnyEvent->now;
1183		1290
1184	$self->{filter_r}	1291	if ($self->{tls}) {
1185	? $self->{filter_r}($self, $rbuf)	1292	Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);
1186	: $self->{_in_drain} \|\| $self->_drain_rbuf;	1293
		1294	&_dotls ($self);
		1295	} else {
		1296	$self->_drain_rbuf unless $self->{_in_drain};
		1297	}
1187		1298
1188	} elsif (defined $len) {	1299	} elsif (defined $len) {
1189	delete $self->{_rw};	1300	delete $self->{_rw};
1190	$self->{_eof} = 1;	1301	$self->{_eof} = 1;
1191	$self->_drain_rbuf unless $self->{_in_drain};	1302	$self->_drain_rbuf unless $self->{_in_drain};
…		…
1195	}	1306	}
1196	});	1307	});
1197	}	1308	}
1198	}	1309	}
1199		1310
		1311	# poll the write BIO and send the data if applicable
1200	sub _dotls {	1312	sub _dotls {
1201	my ($self) = @_;	1313	my ($self) = @_;
1202		1314
1203	my $buf;	1315	my $tmp;
1204		1316
1205	if (length $self->{_tls_wbuf}) {	1317	if (length $self->{_tls_wbuf}) {
1206	while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {	1318	while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {
1207	substr $self->{_tls_wbuf}, 0, $len, "";	1319	substr $self->{_tls_wbuf}, 0, $tmp, "";
1208	}	1320	}
1209	}	1321	}
1210		1322
1211	if (length ($buf = Net::SSLeay::BIO_read ($self->{_wbio}))) {
1212	$self->{wbuf} .= $buf;
1213	$self->_drain_wbuf;
1214	}
1215
1216	while (defined ($buf = Net::SSLeay::read ($self->{tls}))) {	1323	while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) {
1217	if (length $buf) {	1324	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	1325	# let's treat SSL-eof as we treat normal EOF
		1326	delete $self->{_rw};
1222	$self->{_eof} = 1;	1327	$self->{_eof} = 1;
1223	$self->_shutdown;	1328	&_freetls;
1224	return;
1225	}	1329	}
1226	}
1227		1330
		1331	$self->{rbuf} .= $tmp;
		1332	$self->_drain_rbuf unless $self->{_in_drain};
		1333	$self->{tls} or return; # tls session might have gone away in callback
		1334	}
		1335
1228	my $err = Net::SSLeay::get_error ($self->{tls}, -1);	1336	$tmp = Net::SSLeay::get_error ($self->{tls}, -1);
1229		1337
1230	if ($err!= Net::SSLeay::ERROR_WANT_READ ()) {	1338	if ($tmp != Net::SSLeay::ERROR_WANT_READ ()) {
1231	if ($err == Net::SSLeay::ERROR_SYSCALL ()) {	1339	if ($tmp == Net::SSLeay::ERROR_SYSCALL ()) {
1232	return $self->_error ($!, 1);	1340	return $self->_error ($!, 1);
1233	} elsif ($err == Net::SSLeay::ERROR_SSL ()) {	1341	} elsif ($tmp == Net::SSLeay::ERROR_SSL ()) {
1234	return $self->_error (&Errno::EIO, 1);	1342	return $self->_error (&Errno::EIO, 1);
1235	}	1343	}
1236		1344
1237	# all others are fine for our purposes	1345	# all other errors are fine for our purposes
		1346	}
		1347
		1348	while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) {
		1349	$self->{wbuf} .= $tmp;
		1350	$self->_drain_wbuf;
1238	}	1351	}
1239	}	1352	}
1240		1353
1241	=item $handle->starttls ($tls[, $tls_ctx])	1354	=item $handle->starttls ($tls[, $tls_ctx])
1242		1355
…		…
1252		1365
1253	The TLS connection object will end up in C<< $handle->{tls} >> after this	1366	The TLS connection object will end up in C<< $handle->{tls} >> after this
1254	call and can be used or changed to your liking. Note that the handshake	1367	call and can be used or changed to your liking. Note that the handshake
1255	might have already started when this function returns.	1368	might have already started when this function returns.
1256		1369
		1370	If it an error to start a TLS handshake more than once per
		1371	AnyEvent::Handle object (this is due to bugs in OpenSSL).
		1372
1257	=cut	1373	=cut
1258		1374
1259	sub starttls {	1375	sub starttls {
1260	my ($self, $ssl, $ctx) = @_;	1376	my ($self, $ssl, $ctx) = @_;
1261		1377
1262	$self->stoptls;	1378	require Net::SSLeay;
1263		1379
		1380	Carp::croak "it is an error to call starttls more than once on an AnyEvent::Handle object"
		1381	if $self->{tls};
		1382
1264	if ($ssl eq "accept") {	1383	if ($ssl eq "accept") {
1265	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());	1384	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());
1266	Net::SSLeay::set_accept_state ($ssl);	1385	Net::SSLeay::set_accept_state ($ssl);
1267	} elsif ($ssl eq "connect") {	1386	} elsif ($ssl eq "connect") {
1268	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());	1387	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());
…		…
1274	# basically, this is deep magic (because SSL_read should have the same issues)	1393	# 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".	1394	# but the openssl maintainers basically said: "trust us, it just works".
1276	# (unfortunately, we have to hardcode constants because the abysmally misdesigned	1395	# (unfortunately, we have to hardcode constants because the abysmally misdesigned
1277	# and mismaintained ssleay-module doesn't even offer them).	1396	# and mismaintained ssleay-module doesn't even offer them).
1278	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html	1397	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html
		1398	#
		1399	# in short: this is a mess.
		1400	#
		1401	# note that we do not try to keep the length constant between writes as we are required to do.
		1402	# we assume that most (but not all) of this insanity only applies to non-blocking cases,
		1403	# and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to
		1404	# have identity issues in that area.
1279	Net::SSLeay::CTX_set_mode ($self->{tls},	1405	Net::SSLeay::CTX_set_mode ($self->{tls},
1280	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } \|\| 1)	1406	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } \|\| 1)
1281	\| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } \|\| 2));	1407	\| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } \|\| 2));
1282		1408
1283	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1409	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1284	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1410	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1285		1411
1286	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});	1412	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});
1287		1413
1288	$self->{filter_w} = sub {	1414	&_dotls; # need to trigger the initial handshake
1289	$_[0]{_tls_wbuf} .= ${$_[1]};	1415	$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	}	1416	}
1297		1417
1298	=item $handle->stoptls	1418	=item $handle->stoptls
1299		1419
1300	Destroys the SSL connection, if any. Partial read or write data will be	1420	Shuts down the SSL connection - this makes a proper EOF handshake by
1301	lost.	1421	sending a close notify to the other side, but since OpenSSL doesn't
		1422	support non-blocking shut downs, it is not possible to re-use the stream
		1423	afterwards.
1302		1424
1303	=cut	1425	=cut
1304		1426
1305	sub stoptls {	1427	sub stoptls {
1306	my ($self) = @_;	1428	my ($self) = @_;
1307		1429
		1430	if ($self->{tls}) {
		1431	Net::SSLeay::shutdown ($self->{tls});
		1432
		1433	&_dotls;
		1434
		1435	# we don't give a shit. no, we do, but we can't. no...
		1436	# we, we... have to use openssl :/
		1437	&_freetls;
		1438	}
		1439	}
		1440
		1441	sub _freetls {
		1442	my ($self) = @_;
		1443
		1444	return unless $self->{tls};
		1445
1308	Net::SSLeay::free (delete $self->{tls}) if $self->{tls};	1446	Net::SSLeay::free (delete $self->{tls});
1309		1447
1310	delete $self->{_rbio};	1448	delete @$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	}	1449	}
1316		1450
1317	sub DESTROY {	1451	sub DESTROY {
1318	my $self = shift;	1452	my $self = shift;
1319		1453
1320	$self->stoptls;	1454	&_freetls;
1321		1455
1322	my $linger = exists $self->{linger} ? $self->{linger} : 3600;	1456	my $linger = exists $self->{linger} ? $self->{linger} : 3600;
1323		1457
1324	if ($linger && length $self->{wbuf}) {	1458	if ($linger && length $self->{wbuf}) {
1325	my $fh = delete $self->{fh};	1459	my $fh = delete $self->{fh};
…		…
1340	@linger = ();	1474	@linger = ();
1341	});	1475	});
1342	}	1476	}
1343	}	1477	}
1344		1478
		1479	=item $handle->destroy
		1480
		1481	Shuts down the handle object as much as possible - this call ensures that
		1482	no further callbacks will be invoked and resources will be freed as much
		1483	as possible. You must not call any methods on the object afterwards.
		1484
		1485	Normally, you can just "forget" any references to an AnyEvent::Handle
		1486	object and it will simply shut down. This works in fatal error and EOF
		1487	callbacks, as well as code outside. It does I<NOT> work in a read or write
		1488	callback, so when you want to destroy the AnyEvent::Handle object from
		1489	within such an callback. You I<MUST> call C<< ->destroy >> explicitly in
		1490	that case.
		1491
		1492	The handle might still linger in the background and write out remaining
		1493	data, as specified by the C<linger> option, however.
		1494
		1495	=cut
		1496
		1497	sub destroy {
		1498	my ($self) = @_;
		1499
		1500	$self->DESTROY;
		1501	%$self = ();
		1502	}
		1503
1345	=item AnyEvent::Handle::TLS_CTX	1504	=item AnyEvent::Handle::TLS_CTX
1346		1505
1347	This function creates and returns the Net::SSLeay::CTX object used by	1506	This function creates and returns the Net::SSLeay::CTX object used by
1348	default for TLS mode.	1507	default for TLS mode.
1349		1508
…		…
1377	}	1536	}
1378	}	1537	}
1379		1538
1380	=back	1539	=back
1381		1540
		1541
		1542	=head1 NONFREQUENTLY ASKED QUESTIONS
		1543
		1544	=over 4
		1545
		1546	=item I C<undef> the AnyEvent::Handle reference inside my callback and
		1547	still get further invocations!
		1548
		1549	That's because AnyEvent::Handle keeps a reference to itself when handling
		1550	read or write callbacks.
		1551
		1552	It is only safe to "forget" the reference inside EOF or error callbacks,
		1553	from within all other callbacks, you need to explicitly call the C<<
		1554	->destroy >> method.
		1555
		1556	=item I get different callback invocations in TLS mode/Why can't I pause
		1557	reading?
		1558
		1559	Unlike, say, TCP, TLS connections do not consist of two independent
		1560	communication channels, one for each direction. Or put differently. The
		1561	read and write directions are not independent of each other: you cannot
		1562	write data unless you are also prepared to read, and vice versa.
		1563
		1564	This can mean than, in TLS mode, you might get C<on_error> or C<on_eof>
		1565	callback invocations when you are not expecting any read data - the reason
		1566	is that AnyEvent::Handle always reads in TLS mode.
		1567
		1568	During the connection, you have to make sure that you always have a
		1569	non-empty read-queue, or an C<on_read> watcher. At the end of the
		1570	connection (or when you no longer want to use it) you can call the
		1571	C<destroy> method.
		1572
		1573	=item How do I read data until the other side closes the connection?
		1574
		1575	If you just want to read your data into a perl scalar, the easiest way
		1576	to achieve this is by setting an C<on_read> callback that does nothing,
		1577	clearing the C<on_eof> callback and in the C<on_error> callback, the data
		1578	will be in C<$_[0]{rbuf}>:
		1579
		1580	$handle->on_read (sub { });
		1581	$handle->on_eof (undef);
		1582	$handle->on_error (sub {
		1583	my $data = delete $_[0]{rbuf};
		1584	undef $handle;
		1585	});
		1586
		1587	The reason to use C<on_error> is that TCP connections, due to latencies
		1588	and packets loss, might get closed quite violently with an error, when in
		1589	fact, all data has been received.
		1590
		1591	It is usually better to use acknowledgements when transferring data,
		1592	to make sure the other side hasn't just died and you got the data
		1593	intact. This is also one reason why so many internet protocols have an
		1594	explicit QUIT command.
		1595
		1596	=item I don't want to destroy the handle too early - how do I wait until
		1597	all data has been written?
		1598
		1599	After writing your last bits of data, set the C<on_drain> callback
		1600	and destroy the handle in there - with the default setting of
		1601	C<low_water_mark> this will be called precisely when all data has been
		1602	written to the socket:
		1603
		1604	$handle->push_write (...);
		1605	$handle->on_drain (sub {
		1606	warn "all data submitted to the kernel\n";
		1607	undef $handle;
		1608	});
		1609
		1610	=back
		1611
		1612
1382	=head1 SUBCLASSING AnyEvent::Handle	1613	=head1 SUBCLASSING AnyEvent::Handle
1383		1614
1384	In many cases, you might want to subclass AnyEvent::Handle.	1615	In many cases, you might want to subclass AnyEvent::Handle.
1385		1616
1386	To make this easier, a given version of AnyEvent::Handle uses these	1617	To make this easier, a given version of AnyEvent::Handle uses these
…		…
1389	=over 4	1620	=over 4
1390		1621
1391	=item * all constructor arguments become object members.	1622	=item * all constructor arguments become object members.
1392		1623
1393	At least initially, when you pass a C<tls>-argument to the constructor it	1624	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	1625	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).	1626	mutated later on (for example C<tls> will hold the TLS connection object).
1396		1627
1397	=item * other object member names are prefixed with an C<_>.	1628	=item * other object member names are prefixed with an C<_>.
1398		1629
1399	All object members not explicitly documented (internal use) are prefixed	1630	All object members not explicitly documented (internal use) are prefixed

Diff Legend

-–
+Removed lines
-+
+Added lines
-<
+Changed lines
->
+Changed lines

Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents): Revision 1.67 by root, Fri Jun 6 15:33:10 2008 UTC vs. Revision 1.107 by root, Wed Nov 26 06:40:47 2008 UTC

Diff Legend

Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.67 by root, Fri Jun 6 15:33:10 2008 UTC vs.
Revision 1.107 by root, Wed Nov 26 06:40:47 2008 UTC