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

Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.80 by root, Sun Jul 27 08:43:32 2008 UTC vs.
Revision 1.116 by root, Tue Feb 10 14:07:43 2009 UTC

…		…
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 = 4.22;	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 detected,	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 I<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.
87		96
88	If an EOF condition has been detected but no C<on_eof> callback has been	97	If an EOF condition has been detected but no C<on_eof> callback has been
89	set, then a fatal error will be raised with C<$!> set to <0>.	98	set, then a fatal error will be raised with C<$!> set to <0>.
…		…
93	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
94	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
95	connect or a read error.	104	connect or a read error.
96		105
97	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
98	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
99	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
100	recommended to simply ignore this parameter and instead abondon the handle	113	to simply ignore this parameter and instead abondon the handle object
101	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>).
102		116
103	On callback entrance, the value of C<$!> contains the operating system	117	On callback entrance, the value of C<$!> contains the operating system
104	error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>).	118	error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>).
105		119
106	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
…		…
138	=item timeout => $fractional_seconds	152	=item timeout => $fractional_seconds
139		153
140	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
141	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
142	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
143	missing, an C<ETIMEDOUT> error will be raised).	157	missing, a non-fatal C<ETIMEDOUT> error will be raised).
144		158
145	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
146	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
147	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
148	in the C<on_timeout> callback.	162	in the C<on_timeout> callback, in which case AnyEvent::Handle will simply
		163	restart the timeout.
149		164
150	Zero (the default) disables this timeout.	165	Zero (the default) disables this timeout.
151		166
152	=item on_timeout => $cb->($handle)	167	=item on_timeout => $cb->($handle)
153		168
…		…
157		172
158	=item rbuf_max => <bytes>	173	=item rbuf_max => <bytes>
159		174
160	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>)
161	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
162	avoid denial-of-service attacks.	177	avoid some forms of denial-of-service attacks.
163		178
164	For example, a server accepting connections from untrusted sources should	179	For example, a server accepting connections from untrusted sources should
165	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
166	(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
167	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
168	isn't finished).	183	isn't finished).
169		184
170	=item autocork => <boolean>	185	=item autocork => <boolean>
171		186
172	When disabled (the default), then C<push_write> will try to immediately	187	When disabled (the default), then C<push_write> will try to immediately
173	write the data to the handle if possible. This avoids having to register	188	write the data to the handle, if possible. This avoids having to register
174	a write watcher and wait for the next event loop iteration, but can be	189	a write watcher and wait for the next event loop iteration, but can
175	inefficient if you write multiple small chunks (this disadvantage is	190	be inefficient if you write multiple small chunks (on the wire, this
176	usually avoided by your kernel's nagle algorithm, see C<low_delay>).	191	disadvantage is usually avoided by your kernel's nagle algorithm, see
		192	C<no_delay>, but this option can save costly syscalls).
177		193
178	When enabled, then writes will always be queued till the next event loop	194	When enabled, then writes will always be queued till the next event loop
179	iteration. This is efficient when you do many small writes per iteration,	195	iteration. This is efficient when you do many small writes per iteration,
180	but less efficient when you do a single write only.	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.
181		198
182	=item no_delay => <boolean>	199	=item no_delay => <boolean>
183		200
184	When doing small writes on sockets, your operating system kernel might	201	When doing small writes on sockets, your operating system kernel might
185	wait a bit for more data before actually sending it out. This is called	202	wait a bit for more data before actually sending it out. This is called
186	the Nagle algorithm, and usually it is beneficial.	203	the Nagle algorithm, and usually it is beneficial.
187		204
188	In some situations you want as low a delay as possible, which cna be	205	In some situations you want as low a delay as possible, which can be
189	accomplishd by setting this option to true.	206	accomplishd by setting this option to a true value.
190		207
191	The default is your opertaing system's default behaviour, this option	208	The default is your opertaing system's default behaviour (most likely
192	explicitly enables or disables it, if possible.	209	enabled), this option explicitly enables or disables it, if possible.
193		210
194	=item read_size => <bytes>	211	=item read_size => <bytes>
195		212
196	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
197	during each (loop iteration). Default: C<8192>.	214	try to read during each loop iteration, which affects memory
		215	requirements). Default: C<8192>.
198		216
199	=item low_water_mark => <bytes>	217	=item low_water_mark => <bytes>
200		218
201	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
202	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
203	considered empty.	221	considered empty.
204		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
205	=item linger => <seconds>	228	=item linger => <seconds>
206		229
207	If non-zero (default: C<3600>), then the destructor of the	230	If non-zero (default: C<3600>), then the destructor of the
208	AnyEvent::Handle object will check wether there is still outstanding write	231	AnyEvent::Handle object will check whether there is still outstanding
209	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
210	will be reported (this mostly matches how the operating system treats	233	socket. No errors will be reported (this mostly matches how the operating
211	outstanding data at socket close time).	234	system treats outstanding data at socket close time).
212		235
213	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
214	encoded. This data will be lost.	237	yet. This data will be lost. Calling the C<stoptls> method in time might
		238	help.
215		239
216	=item tls => "accept" \| "connect" \| Net::SSLeay::SSL object	240	=item tls => "accept" \| "connect" \| Net::SSLeay::SSL object
217		241
218	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
219	will start making tls handshake and will transparently encrypt/decrypt	243	AnyEvent will start a TLS handshake as soon as the conenction has been
220	data.	244	established and will transparently encrypt/decrypt data afterwards.
221		245
222	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
223	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.
224		250
225	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
226	connection, use C<connect> mode.	252	C<accept>, and for the TLS client side of a connection, use C<connect>
		253	mode.
227		254
228	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
229	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>
230	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
231	AnyEvent::Handle.	258	AnyEvent::Handle.
232		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
233	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.
234		266
235	=item tls_ctx => $ssl_ctx	267	=item tls_ctx => $ssl_ctx
236		268
237	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
238	(unless a connection object was specified directly). If this parameter is	270	(unless a connection object was specified directly). If this parameter is
239	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.	271	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.
240		272
241	=item json => JSON or JSON::XS object	273	=item json => JSON or JSON::XS object
242		274
243	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.
244		276
245	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
246	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.
247		280
248	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
249	use this functionality, as AnyEvent does not have a dependency itself.	282	use this functionality, as AnyEvent does not have a dependency itself.
250		283
251	=item filter_r => $cb
252
253	=item filter_w => $cb
254
255	These exist, but are undocumented at this time.
256
257	=back	284	=back
258		285
259	=cut	286	=cut
260		287
261	sub new {	288	sub new {
…		…
265		292
266	$self->{fh} or Carp::croak "mandatory argument fh is missing";	293	$self->{fh} or Carp::croak "mandatory argument fh is missing";
267		294
268	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;	295	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;
269		296
270	if ($self->{tls}) {
271	require Net::SSLeay;
272	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx});	297	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx})
273	}	298	if $self->{tls};
274		299
275	$self->{_activity} = AnyEvent->now;	300	$self->{_activity} = AnyEvent->now;
276	$self->_timeout;	301	$self->_timeout;
277		302
278	$self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain};	303	$self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain};
…		…
290	delete $self->{_tw};	315	delete $self->{_tw};
291	delete $self->{_rw};	316	delete $self->{_rw};
292	delete $self->{_ww};	317	delete $self->{_ww};
293	delete $self->{fh};	318	delete $self->{fh};
294		319
295	$self->stoptls;	320	&_freetls;
		321
		322	delete $self->{on_read};
		323	delete $self->{_queue};
296	}	324	}
297		325
298	sub _error {	326	sub _error {
299	my ($self, $errno, $fatal) = @_;	327	my ($self, $errno, $fatal) = @_;
300		328
…		…
303		331
304	$! = $errno;	332	$! = $errno;
305		333
306	if ($self->{on_error}) {	334	if ($self->{on_error}) {
307	$self->{on_error}($self, $fatal);	335	$self->{on_error}($self, $fatal);
308	} else {	336	} elsif ($self->{fh}) {
309	Carp::croak "AnyEvent::Handle uncaught error: $!";	337	Carp::croak "AnyEvent::Handle uncaught error: $!";
310	}	338	}
311	}	339	}
312		340
313	=item $fh = $handle->fh	341	=item $fh = $handle->fh
314		342
315	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.
316		344
317	=cut	345	=cut
318		346
319	sub fh { $_[0]{fh} }	347	sub fh { $_[0]{fh} }
320		348
…		…
338	$_[0]{on_eof} = $_[1];	366	$_[0]{on_eof} = $_[1];
339	}	367	}
340		368
341	=item $handle->on_timeout ($cb)	369	=item $handle->on_timeout ($cb)
342		370
343	Replace the current C<on_timeout> callback, or disables the callback	371	Replace the current C<on_timeout> callback, or disables the callback (but
344	(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
345	argument.	373	argument and method.
346		374
347	=cut	375	=cut
348		376
349	sub on_timeout {	377	sub on_timeout {
350	$_[0]{on_timeout} = $_[1];	378	$_[0]{on_timeout} = $_[1];
351	}	379	}
352		380
353	=item $handle->autocork ($boolean)	381	=item $handle->autocork ($boolean)
354		382
355	Enables or disables the current autocork behaviour (see C<autocork>	383	Enables or disables the current autocork behaviour (see C<autocork>
356	constructor argument).	384	constructor argument). Changes will only take effect on the next write.
357		385
358	=cut	386	=cut
		387
		388	sub autocork {
		389	$_[0]{autocork} = $_[1];
		390	}
359		391
360	=item $handle->no_delay ($boolean)	392	=item $handle->no_delay ($boolean)
361		393
362	Enables or disables the C<no_delay> setting (see constructor argument of	394	Enables or disables the C<no_delay> setting (see constructor argument of
363	the same name for details).	395	the same name for details).
…		…
456	my ($self, $cb) = @_;	488	my ($self, $cb) = @_;
457		489
458	$self->{on_drain} = $cb;	490	$self->{on_drain} = $cb;
459		491
460	$cb->($self)	492	$cb->($self)
461	if $cb && $self->{low_water_mark} >= length $self->{wbuf};	493	if $cb && $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf});
462	}	494	}
463		495
464	=item $handle->push_write ($data)	496	=item $handle->push_write ($data)
465		497
466	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
…		…
483	substr $self->{wbuf}, 0, $len, "";	515	substr $self->{wbuf}, 0, $len, "";
484		516
485	$self->{_activity} = AnyEvent->now;	517	$self->{_activity} = AnyEvent->now;
486		518
487	$self->{on_drain}($self)	519	$self->{on_drain}($self)
488	if $self->{low_water_mark} >= length $self->{wbuf}	520	if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf})
489	&& $self->{on_drain};	521	&& $self->{on_drain};
490		522
491	delete $self->{_ww} unless length $self->{wbuf};	523	delete $self->{_ww} unless length $self->{wbuf};
492	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	524	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
493	$self->_error ($!, 1);	525	$self->_error ($!, 1);
…		…
517		549
518	@_ = ($WH{$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")
519	->($self, @_);	551	->($self, @_);
520	}	552	}
521		553
522	if ($self->{filter_w}) {	554	if ($self->{tls}) {
523	$self->{filter_w}($self, \$_[0]);	555	$self->{_tls_wbuf} .= $_[0];
		556
		557	&_dotls ($self);
524	} else {	558	} else {
525	$self->{wbuf} .= $_[0];	559	$self->{wbuf} .= $_[0];
526	$self->_drain_wbuf;	560	$self->_drain_wbuf;
527	}	561	}
528	}	562	}
…		…
545	=cut	579	=cut
546		580
547	register_write_type netstring => sub {	581	register_write_type netstring => sub {
548	my ($self, $string) = @_;	582	my ($self, $string) = @_;
549		583
550	sprintf "%d:%s,", (length $string), $string	584	(length $string) . ":$string,"
551	};	585	};
552		586
553	=item packstring => $format, $data	587	=item packstring => $format, $data
554		588
555	An octet string prefixed with an encoded length. The encoding C<$format>	589	An octet string prefixed with an encoded length. The encoding C<$format>
…		…
729		763
730	if (	764	if (
731	defined $self->{rbuf_max}	765	defined $self->{rbuf_max}
732	&& $self->{rbuf_max} < length $self->{rbuf}	766	&& $self->{rbuf_max} < length $self->{rbuf}
733	) {	767	) {
734	return $self->_error (&Errno::ENOSPC, 1);	768	$self->_error (&Errno::ENOSPC, 1), return;
735	}	769	}
736		770
737	while () {	771	while () {
		772	$self->{rbuf} .= delete $self->{_tls_rbuf} if exists $self->{_tls_rbuf};
		773
738	my $len = length $self->{rbuf};	774	my $len = length $self->{rbuf};
739		775
740	if (my $cb = shift @{ $self->{_queue} }) {	776	if (my $cb = shift @{ $self->{_queue} }) {
741	unless ($cb->($self)) {	777	unless ($cb->($self)) {
742	if ($self->{_eof}) {	778	if ($self->{_eof}) {
743	# no progress can be made (not enough data and no data forthcoming)	779	# no progress can be made (not enough data and no data forthcoming)
744	$self->_error (&Errno::EPIPE, 1), last;	780	$self->_error (&Errno::EPIPE, 1), return;
745	}	781	}
746		782
747	unshift @{ $self->{_queue} }, $cb;	783	unshift @{ $self->{_queue} }, $cb;
748	last;	784	last;
749	}	785	}
…		…
757	&& !@{ $self->{_queue} } # and the queue is still empty	793	&& !@{ $self->{_queue} } # and the queue is still empty
758	&& $self->{on_read} # but we still have on_read	794	&& $self->{on_read} # but we still have on_read
759	) {	795	) {
760	# no further data will arrive	796	# no further data will arrive
761	# so no progress can be made	797	# so no progress can be made
762	$self->_error (&Errno::EPIPE, 1), last	798	$self->_error (&Errno::EPIPE, 1), return
763	if $self->{_eof};	799	if $self->{_eof};
764		800
765	last; # more data might arrive	801	last; # more data might arrive
766	}	802	}
767	} else {	803	} else {
768	# read side becomes idle	804	# read side becomes idle
769	delete $self->{_rw};	805	delete $self->{_rw} unless $self->{tls};
770	last;	806	last;
771	}	807	}
772	}	808	}
773		809
774	if ($self->{_eof}) {	810	if ($self->{_eof}) {
…		…
1069	An octet string prefixed with an encoded length. The encoding C<$format>	1105	An octet string prefixed with an encoded length. The encoding C<$format>
1070	uses the same format as a Perl C<pack> format, but must specify a single	1106	uses the same format as a Perl C<pack> format, but must specify a single
1071	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an	1107	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an
1072	optional C<!>, C<< < >> or C<< > >> modifier).	1108	optional C<!>, C<< < >> or C<< > >> modifier).
1073		1109
1074	DNS over TCP uses a prefix of C<n>, EPP uses a prefix of C<N>.	1110	For example, DNS over TCP uses a prefix of C<n> (2 octet network order),
		1111	EPP uses a prefix of C<N> (4 octtes).
1075		1112
1076	Example: read a block of data prefixed by its length in BER-encoded	1113	Example: read a block of data prefixed by its length in BER-encoded
1077	format (very efficient).	1114	format (very efficient).
1078		1115
1079	$handle->push_read (packstring => "w", sub {	1116	$handle->push_read (packstring => "w", sub {
…		…
1109	}	1146	}
1110	};	1147	};
1111		1148
1112	=item json => $cb->($handle, $hash_or_arrayref)	1149	=item json => $cb->($handle, $hash_or_arrayref)
1113		1150
1114	Reads a JSON object or array, decodes it and passes it to the callback.	1151	Reads a JSON object or array, decodes it and passes it to the
		1152	callback. When a parse error occurs, an C<EBADMSG> error will be raised.
1115		1153
1116	If a C<json> object was passed to the constructor, then that will be used	1154	If a C<json> object was passed to the constructor, then that will be used
1117	for the final decode, otherwise it will create a JSON coder expecting UTF-8.	1155	for the final decode, otherwise it will create a JSON coder expecting UTF-8.
1118		1156
1119	This read type uses the incremental parser available with JSON version	1157	This read type uses the incremental parser available with JSON version
…		…
1136	my $rbuf = \$self->{rbuf};	1174	my $rbuf = \$self->{rbuf};
1137		1175
1138	my $json = $self->{json} \|\|= JSON->new->utf8;	1176	my $json = $self->{json} \|\|= JSON->new->utf8;
1139		1177
1140	sub {	1178	sub {
1141	my $ref = $json->incr_parse ($self->{rbuf});	1179	my $ref = eval { $json->incr_parse ($self->{rbuf}) };
1142		1180
1143	if ($ref) {	1181	if ($ref) {
1144	$self->{rbuf} = $json->incr_text;	1182	$self->{rbuf} = $json->incr_text;
1145	$json->incr_text = "";	1183	$json->incr_text = "";
1146	$cb->($self, $ref);	1184	$cb->($self, $ref);
1147		1185
1148	1	1186	1
		1187	} elsif ($@) {
		1188	# error case
		1189	$json->incr_skip;
		1190
		1191	$self->{rbuf} = $json->incr_text;
		1192	$json->incr_text = "";
		1193
		1194	$self->_error (&Errno::EBADMSG);
		1195
		1196	()
1149	} else {	1197	} else {
1150	$self->{rbuf} = "";	1198	$self->{rbuf} = "";
		1199
1151	()	1200	()
1152	}	1201	}
1153	}	1202	}
1154	};	1203	};
1155		1204
…		…
1232	Note that AnyEvent::Handle will automatically C<start_read> for you when	1281	Note that AnyEvent::Handle will automatically C<start_read> for you when
1233	you change the C<on_read> callback or push/unshift a read callback, and it	1282	you change the C<on_read> callback or push/unshift a read callback, and it
1234	will automatically C<stop_read> for you when neither C<on_read> is set nor	1283	will automatically C<stop_read> for you when neither C<on_read> is set nor
1235	there are any read requests in the queue.	1284	there are any read requests in the queue.
1236		1285
		1286	These methods will have no effect when in TLS mode (as TLS doesn't support
		1287	half-duplex connections).
		1288
1237	=cut	1289	=cut
1238		1290
1239	sub stop_read {	1291	sub stop_read {
1240	my ($self) = @_;	1292	my ($self) = @_;
1241		1293
1242	delete $self->{_rw};	1294	delete $self->{_rw} unless $self->{tls};
1243	}	1295	}
1244		1296
1245	sub start_read {	1297	sub start_read {
1246	my ($self) = @_;	1298	my ($self) = @_;
1247		1299
1248	unless ($self->{_rw} \|\| $self->{_eof}) {	1300	unless ($self->{_rw} \|\| $self->{_eof}) {
1249	Scalar::Util::weaken $self;	1301	Scalar::Util::weaken $self;
1250		1302
1251	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {	1303	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {
1252	my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf};	1304	my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});
1253	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} \|\| 8192, length $$rbuf;	1305	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} \|\| 8192, length $$rbuf;
1254		1306
1255	if ($len > 0) {	1307	if ($len > 0) {
1256	$self->{_activity} = AnyEvent->now;	1308	$self->{_activity} = AnyEvent->now;
1257		1309
1258	$self->{filter_r}	1310	if ($self->{tls}) {
1259	? $self->{filter_r}($self, $rbuf)	1311	Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);
1260	: $self->{_in_drain} \|\| $self->_drain_rbuf;	1312
		1313	&_dotls ($self);
		1314	} else {
		1315	$self->_drain_rbuf unless $self->{_in_drain};
		1316	}
1261		1317
1262	} elsif (defined $len) {	1318	} elsif (defined $len) {
1263	delete $self->{_rw};	1319	delete $self->{_rw};
1264	$self->{_eof} = 1;	1320	$self->{_eof} = 1;
1265	$self->_drain_rbuf unless $self->{_in_drain};	1321	$self->_drain_rbuf unless $self->{_in_drain};
…		…
1269	}	1325	}
1270	});	1326	});
1271	}	1327	}
1272	}	1328	}
1273		1329
		1330	# poll the write BIO and send the data if applicable
1274	sub _dotls {	1331	sub _dotls {
1275	my ($self) = @_;	1332	my ($self) = @_;
1276		1333
1277	my $buf;	1334	my $tmp;
1278		1335
1279	if (length $self->{_tls_wbuf}) {	1336	if (length $self->{_tls_wbuf}) {
1280	while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {	1337	while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {
1281	substr $self->{_tls_wbuf}, 0, $len, "";	1338	substr $self->{_tls_wbuf}, 0, $tmp, "";
1282	}	1339	}
1283	}	1340	}
1284		1341
1285	if (length ($buf = Net::SSLeay::BIO_read ($self->{_wbio}))) {
1286	$self->{wbuf} .= $buf;
1287	$self->_drain_wbuf;
1288	}
1289
1290	while (defined ($buf = Net::SSLeay::read ($self->{tls}))) {	1342	while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) {
1291	if (length $buf) {	1343	unless (length $tmp) {
1292	$self->{rbuf} .= $buf;
1293	$self->_drain_rbuf unless $self->{_in_drain};
1294	} else {
1295	# let's treat SSL-eof as we treat normal EOF	1344	# let's treat SSL-eof as we treat normal EOF
		1345	delete $self->{_rw};
1296	$self->{_eof} = 1;	1346	$self->{_eof} = 1;
1297	$self->_shutdown;	1347	&_freetls;
1298	return;
1299	}	1348	}
1300	}
1301		1349
		1350	$self->{_tls_rbuf} .= $tmp;
		1351	$self->_drain_rbuf unless $self->{_in_drain};
		1352	$self->{tls} or return; # tls session might have gone away in callback
		1353	}
		1354
1302	my $err = Net::SSLeay::get_error ($self->{tls}, -1);	1355	$tmp = Net::SSLeay::get_error ($self->{tls}, -1);
1303		1356
1304	if ($err!= Net::SSLeay::ERROR_WANT_READ ()) {	1357	if ($tmp != Net::SSLeay::ERROR_WANT_READ ()) {
1305	if ($err == Net::SSLeay::ERROR_SYSCALL ()) {	1358	if ($tmp == Net::SSLeay::ERROR_SYSCALL ()) {
1306	return $self->_error ($!, 1);	1359	return $self->_error ($!, 1);
1307	} elsif ($err == Net::SSLeay::ERROR_SSL ()) {	1360	} elsif ($tmp == Net::SSLeay::ERROR_SSL ()) {
1308	return $self->_error (&Errno::EIO, 1);	1361	return $self->_error (&Errno::EIO, 1);
1309	}	1362	}
1310		1363
1311	# all others are fine for our purposes	1364	# all other errors are fine for our purposes
		1365	}
		1366
		1367	while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) {
		1368	$self->{wbuf} .= $tmp;
		1369	$self->_drain_wbuf;
1312	}	1370	}
1313	}	1371	}
1314		1372
1315	=item $handle->starttls ($tls[, $tls_ctx])	1373	=item $handle->starttls ($tls[, $tls_ctx])
1316		1374
…		…
1326		1384
1327	The TLS connection object will end up in C<< $handle->{tls} >> after this	1385	The TLS connection object will end up in C<< $handle->{tls} >> after this
1328	call and can be used or changed to your liking. Note that the handshake	1386	call and can be used or changed to your liking. Note that the handshake
1329	might have already started when this function returns.	1387	might have already started when this function returns.
1330		1388
		1389	If it an error to start a TLS handshake more than once per
		1390	AnyEvent::Handle object (this is due to bugs in OpenSSL).
		1391
1331	=cut	1392	=cut
1332		1393
1333	sub starttls {	1394	sub starttls {
1334	my ($self, $ssl, $ctx) = @_;	1395	my ($self, $ssl, $ctx) = @_;
1335		1396
1336	$self->stoptls;	1397	require Net::SSLeay;
1337		1398
		1399	Carp::croak "it is an error to call starttls more than once on an AnyEvent::Handle object"
		1400	if $self->{tls};
		1401
1338	if ($ssl eq "accept") {	1402	if ($ssl eq "accept") {
1339	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());	1403	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());
1340	Net::SSLeay::set_accept_state ($ssl);	1404	Net::SSLeay::set_accept_state ($ssl);
1341	} elsif ($ssl eq "connect") {	1405	} elsif ($ssl eq "connect") {
1342	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());	1406	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());
…		…
1348	# basically, this is deep magic (because SSL_read should have the same issues)	1412	# basically, this is deep magic (because SSL_read should have the same issues)
1349	# but the openssl maintainers basically said: "trust us, it just works".	1413	# but the openssl maintainers basically said: "trust us, it just works".
1350	# (unfortunately, we have to hardcode constants because the abysmally misdesigned	1414	# (unfortunately, we have to hardcode constants because the abysmally misdesigned
1351	# and mismaintained ssleay-module doesn't even offer them).	1415	# and mismaintained ssleay-module doesn't even offer them).
1352	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html	1416	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html
		1417	#
		1418	# in short: this is a mess.
		1419	#
		1420	# note that we do not try to keep the length constant between writes as we are required to do.
		1421	# we assume that most (but not all) of this insanity only applies to non-blocking cases,
		1422	# and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to
		1423	# have identity issues in that area.
1353	Net::SSLeay::CTX_set_mode ($self->{tls},	1424	Net::SSLeay::CTX_set_mode ($self->{tls},
1354	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } \|\| 1)	1425	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } \|\| 1)
1355	\| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } \|\| 2));	1426	\| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } \|\| 2));
1356		1427
1357	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1428	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1358	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1429	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1359		1430
1360	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});	1431	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});
1361		1432
1362	$self->{filter_w} = sub {	1433	&_dotls; # need to trigger the initial handshake
1363	$_[0]{_tls_wbuf} .= ${$_[1]};	1434	$self->start_read; # make sure we actually do read
1364	&_dotls;
1365	};
1366	$self->{filter_r} = sub {
1367	Net::SSLeay::BIO_write ($_[0]{_rbio}, ${$_[1]});
1368	&_dotls;
1369	};
1370	}	1435	}
1371		1436
1372	=item $handle->stoptls	1437	=item $handle->stoptls
1373		1438
1374	Destroys the SSL connection, if any. Partial read or write data will be	1439	Shuts down the SSL connection - this makes a proper EOF handshake by
1375	lost.	1440	sending a close notify to the other side, but since OpenSSL doesn't
		1441	support non-blocking shut downs, it is not possible to re-use the stream
		1442	afterwards.
1376		1443
1377	=cut	1444	=cut
1378		1445
1379	sub stoptls {	1446	sub stoptls {
1380	my ($self) = @_;	1447	my ($self) = @_;
1381		1448
		1449	if ($self->{tls}) {
		1450	Net::SSLeay::shutdown ($self->{tls});
		1451
		1452	&_dotls;
		1453
		1454	# we don't give a shit. no, we do, but we can't. no...
		1455	# we, we... have to use openssl :/
		1456	&_freetls;
		1457	}
		1458	}
		1459
		1460	sub _freetls {
		1461	my ($self) = @_;
		1462
		1463	return unless $self->{tls};
		1464
1382	Net::SSLeay::free (delete $self->{tls}) if $self->{tls};	1465	Net::SSLeay::free (delete $self->{tls});
1383		1466
1384	delete $self->{_rbio};	1467	delete @$self{qw(_rbio _wbio _tls_wbuf)};
1385	delete $self->{_wbio};
1386	delete $self->{_tls_wbuf};
1387	delete $self->{filter_r};
1388	delete $self->{filter_w};
1389	}	1468	}
1390		1469
1391	sub DESTROY {	1470	sub DESTROY {
1392	my $self = shift;	1471	my $self = shift;
1393		1472
1394	$self->stoptls;	1473	&_freetls;
1395		1474
1396	my $linger = exists $self->{linger} ? $self->{linger} : 3600;	1475	my $linger = exists $self->{linger} ? $self->{linger} : 3600;
1397		1476
1398	if ($linger && length $self->{wbuf}) {	1477	if ($linger && length $self->{wbuf}) {
1399	my $fh = delete $self->{fh};	1478	my $fh = delete $self->{fh};
…		…
1414	@linger = ();	1493	@linger = ();
1415	});	1494	});
1416	}	1495	}
1417	}	1496	}
1418		1497
		1498	=item $handle->destroy
		1499
		1500	Shuts down the handle object as much as possible - this call ensures that
		1501	no further callbacks will be invoked and resources will be freed as much
		1502	as possible. You must not call any methods on the object afterwards.
		1503
		1504	Normally, you can just "forget" any references to an AnyEvent::Handle
		1505	object and it will simply shut down. This works in fatal error and EOF
		1506	callbacks, as well as code outside. It does I<NOT> work in a read or write
		1507	callback, so when you want to destroy the AnyEvent::Handle object from
		1508	within such an callback. You I<MUST> call C<< ->destroy >> explicitly in
		1509	that case.
		1510
		1511	The handle might still linger in the background and write out remaining
		1512	data, as specified by the C<linger> option, however.
		1513
		1514	=cut
		1515
		1516	sub destroy {
		1517	my ($self) = @_;
		1518
		1519	$self->DESTROY;
		1520	%$self = ();
		1521	}
		1522
1419	=item AnyEvent::Handle::TLS_CTX	1523	=item AnyEvent::Handle::TLS_CTX
1420		1524
1421	This function creates and returns the Net::SSLeay::CTX object used by	1525	This function creates and returns the Net::SSLeay::CTX object used by
1422	default for TLS mode.	1526	default for TLS mode.
1423		1527
…		…
1451	}	1555	}
1452	}	1556	}
1453		1557
1454	=back	1558	=back
1455		1559
		1560
		1561	=head1 NONFREQUENTLY ASKED QUESTIONS
		1562
		1563	=over 4
		1564
		1565	=item I C<undef> the AnyEvent::Handle reference inside my callback and
		1566	still get further invocations!
		1567
		1568	That's because AnyEvent::Handle keeps a reference to itself when handling
		1569	read or write callbacks.
		1570
		1571	It is only safe to "forget" the reference inside EOF or error callbacks,
		1572	from within all other callbacks, you need to explicitly call the C<<
		1573	->destroy >> method.
		1574
		1575	=item I get different callback invocations in TLS mode/Why can't I pause
		1576	reading?
		1577
		1578	Unlike, say, TCP, TLS connections do not consist of two independent
		1579	communication channels, one for each direction. Or put differently. The
		1580	read and write directions are not independent of each other: you cannot
		1581	write data unless you are also prepared to read, and vice versa.
		1582
		1583	This can mean than, in TLS mode, you might get C<on_error> or C<on_eof>
		1584	callback invocations when you are not expecting any read data - the reason
		1585	is that AnyEvent::Handle always reads in TLS mode.
		1586
		1587	During the connection, you have to make sure that you always have a
		1588	non-empty read-queue, or an C<on_read> watcher. At the end of the
		1589	connection (or when you no longer want to use it) you can call the
		1590	C<destroy> method.
		1591
		1592	=item How do I read data until the other side closes the connection?
		1593
		1594	If you just want to read your data into a perl scalar, the easiest way
		1595	to achieve this is by setting an C<on_read> callback that does nothing,
		1596	clearing the C<on_eof> callback and in the C<on_error> callback, the data
		1597	will be in C<$_[0]{rbuf}>:
		1598
		1599	$handle->on_read (sub { });
		1600	$handle->on_eof (undef);
		1601	$handle->on_error (sub {
		1602	my $data = delete $_[0]{rbuf};
		1603	undef $handle;
		1604	});
		1605
		1606	The reason to use C<on_error> is that TCP connections, due to latencies
		1607	and packets loss, might get closed quite violently with an error, when in
		1608	fact, all data has been received.
		1609
		1610	It is usually better to use acknowledgements when transferring data,
		1611	to make sure the other side hasn't just died and you got the data
		1612	intact. This is also one reason why so many internet protocols have an
		1613	explicit QUIT command.
		1614
		1615	=item I don't want to destroy the handle too early - how do I wait until
		1616	all data has been written?
		1617
		1618	After writing your last bits of data, set the C<on_drain> callback
		1619	and destroy the handle in there - with the default setting of
		1620	C<low_water_mark> this will be called precisely when all data has been
		1621	written to the socket:
		1622
		1623	$handle->push_write (...);
		1624	$handle->on_drain (sub {
		1625	warn "all data submitted to the kernel\n";
		1626	undef $handle;
		1627	});
		1628
		1629	=back
		1630
		1631
1456	=head1 SUBCLASSING AnyEvent::Handle	1632	=head1 SUBCLASSING AnyEvent::Handle
1457		1633
1458	In many cases, you might want to subclass AnyEvent::Handle.	1634	In many cases, you might want to subclass AnyEvent::Handle.
1459		1635
1460	To make this easier, a given version of AnyEvent::Handle uses these	1636	To make this easier, a given version of AnyEvent::Handle uses these

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Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents): Revision 1.80 by root, Sun Jul 27 08:43:32 2008 UTC vs. Revision 1.116 by root, Tue Feb 10 14:07:43 2009 UTC

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Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.80 by root, Sun Jul 27 08:43:32 2008 UTC vs.
Revision 1.116 by root, Tue Feb 10 14:07:43 2009 UTC