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

Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.87 by root, Thu Aug 21 20:52:39 2008 UTC vs.
Revision 1.137 by root, Sat Jul 4 23:58:52 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 = 4.232;	19	our $VERSION = 4.452;
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");
…		…
63		63
64	=head1 METHODS	64	=head1 METHODS
65		65
66	=over 4	66	=over 4
67		67
68	=item B<new (%args)>	68	=item $handle = B<new> AnyEvent::TLS fh => $filehandle, key => value...
69		69
70	The constructor supports these arguments (all as key => value pairs).	70	The constructor supports these arguments (all as C<< key => value >> pairs).
71		71
72	=over 4	72	=over 4
73		73
74	=item fh => $filehandle [MANDATORY]	74	=item fh => $filehandle [MANDATORY]
75		75
…		…
84	Set the callback to be called when an end-of-file condition is detected,	84	Set the callback to be called when an end-of-file condition is detected,
85	i.e. in the case of a socket, when the other side has closed the	85	i.e. in the case of a socket, when the other side has closed the
86	connection cleanly.	86	connection cleanly.
87		87
88	For sockets, this just means that the other side has stopped sending data,	88	For sockets, this just means that the other side has stopped sending data,
89	you can still try to write data, and, in fact, one can return from the eof	89	you can still try to write data, and, in fact, one can return from the EOF
90	callback and continue writing data, as only the read part has been shut	90	callback and continue writing data, as only the read part has been shut
91	down.	91	down.
92		92
93	While not mandatory, it is I<highly> recommended to set an eof callback,	93	While not mandatory, it is I<highly> recommended to set an EOF callback,
94	otherwise you might end up with a closed socket while you are still	94	otherwise you might end up with a closed socket while you are still
95	waiting for data.	95	waiting for data.
96		96
97	If an EOF condition has been detected but no C<on_eof> callback has been	97	If an EOF condition has been detected but no C<on_eof> callback has been
98	set, then a fatal error will be raised with C<$!> set to <0>.	98	set, then a fatal error will be raised with C<$!> set to <0>.
99		99
100	=item on_error => $cb->($handle, $fatal)	100	=item on_error => $cb->($handle, $fatal, $message)
101		101
102	This is the error callback, which is called when, well, some error	102	This is the error callback, which is called when, well, some error
103	occured, such as not being able to resolve the hostname, failure to	103	occured, such as not being able to resolve the hostname, failure to
104	connect or a read error.	104	connect or a read error.
105		105
106	Some errors are fatal (which is indicated by C<$fatal> being true). On	106	Some errors are fatal (which is indicated by C<$fatal> being true). On
107	fatal errors the handle object will be shut down and will not be usable	107	fatal errors the handle object will be shut down and will not be usable
108	(but you are free to look at the current C< ->rbuf >). Examples of fatal	108	(but you are free to look at the current C<< ->rbuf >>). Examples of fatal
109	errors are an EOF condition with active (but unsatisifable) read watchers	109	errors are an EOF condition with active (but unsatisifable) read watchers
110	(C<EPIPE>) or I/O errors.	110	(C<EPIPE>) or I/O errors.
		111
		112	AnyEvent::Handle tries to find an appropriate error code for you to check
		113	against, but in some cases (TLS errors), this does not work well. It is
		114	recommended to always output the C<$message> argument in human-readable
		115	error messages (it's usually the same as C<"$!">).
111		116
112	Non-fatal errors can be retried by simply returning, but it is recommended	117	Non-fatal errors can be retried by simply returning, but it is recommended
113	to simply ignore this parameter and instead abondon the handle object	118	to simply ignore this parameter and instead abondon the handle object
114	when this callback is invoked. Examples of non-fatal errors are timeouts	119	when this callback is invoked. Examples of non-fatal errors are timeouts
115	C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>).	120	C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>).
116		121
117	On callback entrance, the value of C<$!> contains the operating system	122	On callback entrance, the value of C<$!> contains the operating system
118	error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>).	123	error code (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT>, C<EBADMSG> or
		124	C<EPROTO>).
119		125
120	While not mandatory, it is I<highly> recommended to set this callback, as	126	While not mandatory, it is I<highly> recommended to set this callback, as
121	you will not be notified of errors otherwise. The default simply calls	127	you will not be notified of errors otherwise. The default simply calls
122	C<croak>.	128	C<croak>.
123		129
…		…
127	and no read request is in the queue (unlike read queue callbacks, this	133	and no read request is in the queue (unlike read queue callbacks, this
128	callback will only be called when at least one octet of data is in the	134	callback will only be called when at least one octet of data is in the
129	read buffer).	135	read buffer).
130		136
131	To access (and remove data from) the read buffer, use the C<< ->rbuf >>	137	To access (and remove data from) the read buffer, use the C<< ->rbuf >>
132	method or access the C<$handle->{rbuf}> member directly.	138	method or access the C<$handle->{rbuf}> member directly. Note that you
		139	must not enlarge or modify the read buffer, you can only remove data at
		140	the beginning from it.
133		141
134	When an EOF condition is detected then AnyEvent::Handle will first try to	142	When an EOF condition is detected then AnyEvent::Handle will first try to
135	feed all the remaining data to the queued callbacks and C<on_read> before	143	feed all the remaining data to the queued callbacks and C<on_read> before
136	calling the C<on_eof> callback. If no progress can be made, then a fatal	144	calling the C<on_eof> callback. If no progress can be made, then a fatal
137	error will be raised (with C<$!> set to C<EPIPE>).	145	error will be raised (with C<$!> set to C<EPIPE>).
…		…
152	=item timeout => $fractional_seconds	160	=item timeout => $fractional_seconds
153		161
154	If non-zero, then this enables an "inactivity" timeout: whenever this many	162	If non-zero, then this enables an "inactivity" timeout: whenever this many
155	seconds pass without a successful read or write on the underlying file	163	seconds pass without a successful read or write on the underlying file
156	handle, the C<on_timeout> callback will be invoked (and if that one is	164	handle, the C<on_timeout> callback will be invoked (and if that one is
157	missing, an C<ETIMEDOUT> error will be raised).	165	missing, a non-fatal C<ETIMEDOUT> error will be raised).
158		166
159	Note that timeout processing is also active when you currently do not have	167	Note that timeout processing is also active when you currently do not have
160	any outstanding read or write requests: If you plan to keep the connection	168	any outstanding read or write requests: If you plan to keep the connection
161	idle then you should disable the timout temporarily or ignore the timeout	169	idle then you should disable the timout temporarily or ignore the timeout
162	in the C<on_timeout> callback.	170	in the C<on_timeout> callback, in which case AnyEvent::Handle will simply
		171	restart the timeout.
163		172
164	Zero (the default) disables this timeout.	173	Zero (the default) disables this timeout.
165		174
166	=item on_timeout => $cb->($handle)	175	=item on_timeout => $cb->($handle)
167		176
…		…
171		180
172	=item rbuf_max => <bytes>	181	=item rbuf_max => <bytes>
173		182
174	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)	183	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)
175	when the read buffer ever (strictly) exceeds this size. This is useful to	184	when the read buffer ever (strictly) exceeds this size. This is useful to
176	avoid denial-of-service attacks.	185	avoid some forms of denial-of-service attacks.
177		186
178	For example, a server accepting connections from untrusted sources should	187	For example, a server accepting connections from untrusted sources should
179	be configured to accept only so-and-so much data that it cannot act on	188	be configured to accept only so-and-so much data that it cannot act on
180	(for example, when expecting a line, an attacker could send an unlimited	189	(for example, when expecting a line, an attacker could send an unlimited
181	amount of data without a callback ever being called as long as the line	190	amount of data without a callback ever being called as long as the line
182	isn't finished).	191	isn't finished).
183		192
184	=item autocork => <boolean>	193	=item autocork => <boolean>
185		194
186	When disabled (the default), then C<push_write> will try to immediately	195	When disabled (the default), then C<push_write> will try to immediately
187	write the data to the handle if possible. This avoids having to register	196	write the data to the handle, if possible. This avoids having to register
188	a write watcher and wait for the next event loop iteration, but can be	197	a write watcher and wait for the next event loop iteration, but can
189	inefficient if you write multiple small chunks (this disadvantage is	198	be inefficient if you write multiple small chunks (on the wire, this
190	usually avoided by your kernel's nagle algorithm, see C<low_delay>).	199	disadvantage is usually avoided by your kernel's nagle algorithm, see
		200	C<no_delay>, but this option can save costly syscalls).
191		201
192	When enabled, then writes will always be queued till the next event loop	202	When enabled, then writes will always be queued till the next event loop
193	iteration. This is efficient when you do many small writes per iteration,	203	iteration. This is efficient when you do many small writes per iteration,
194	but less efficient when you do a single write only.	204	but less efficient when you do a single write only per iteration (or when
		205	the write buffer often is full). It also increases write latency.
195		206
196	=item no_delay => <boolean>	207	=item no_delay => <boolean>
197		208
198	When doing small writes on sockets, your operating system kernel might	209	When doing small writes on sockets, your operating system kernel might
199	wait a bit for more data before actually sending it out. This is called	210	wait a bit for more data before actually sending it out. This is called
200	the Nagle algorithm, and usually it is beneficial.	211	the Nagle algorithm, and usually it is beneficial.
201		212
202	In some situations you want as low a delay as possible, which cna be	213	In some situations you want as low a delay as possible, which can be
203	accomplishd by setting this option to true.	214	accomplishd by setting this option to a true value.
204		215
205	The default is your opertaing system's default behaviour, this option	216	The default is your opertaing system's default behaviour (most likely
206	explicitly enables or disables it, if possible.	217	enabled), this option explicitly enables or disables it, if possible.
207		218
208	=item read_size => <bytes>	219	=item read_size => <bytes>
209		220
210	The default read block size (the amount of bytes this module will try to read	221	The default read block size (the amount of bytes this module will
211	during each (loop iteration). Default: C<8192>.	222	try to read during each loop iteration, which affects memory
		223	requirements). Default: C<8192>.
212		224
213	=item low_water_mark => <bytes>	225	=item low_water_mark => <bytes>
214		226
215	Sets the amount of bytes (default: C<0>) that make up an "empty" write	227	Sets the amount of bytes (default: C<0>) that make up an "empty" write
216	buffer: If the write reaches this size or gets even samller it is	228	buffer: If the write reaches this size or gets even samller it is
217	considered empty.	229	considered empty.
218		230
		231	Sometimes it can be beneficial (for performance reasons) to add data to
		232	the write buffer before it is fully drained, but this is a rare case, as
		233	the operating system kernel usually buffers data as well, so the default
		234	is good in almost all cases.
		235
219	=item linger => <seconds>	236	=item linger => <seconds>
220		237
221	If non-zero (default: C<3600>), then the destructor of the	238	If non-zero (default: C<3600>), then the destructor of the
222	AnyEvent::Handle object will check wether there is still outstanding write	239	AnyEvent::Handle object will check whether there is still outstanding
223	data and will install a watcher that will write out this data. No errors	240	write data and will install a watcher that will write this data to the
224	will be reported (this mostly matches how the operating system treats	241	socket. No errors will be reported (this mostly matches how the operating
225	outstanding data at socket close time).	242	system treats outstanding data at socket close time).
226		243
227	This will not work for partial TLS data that could not yet been	244	This will not work for partial TLS data that could not be encoded
228	encoded. This data will be lost.	245	yet. This data will be lost. Calling the C<stoptls> method in time might
		246	help.
		247
		248	=item peername => $string
		249
		250	A string used to identify the remote site - usually the DNS hostname
		251	(I<not> IDN!) used to create the connection, rarely the IP address.
		252
		253	Apart from being useful in error messages, this string is also used in TLS
		254	common name verification (see C<verify_cn> in L<AnyEvent::TLS>).
229		255
230	=item tls => "accept" \| "connect" \| Net::SSLeay::SSL object	256	=item tls => "accept" \| "connect" \| Net::SSLeay::SSL object
231		257
232	When this parameter is given, it enables TLS (SSL) mode, that means	258	When this parameter is given, it enables TLS (SSL) mode, that means
233	AnyEvent will start a TLS handshake and will transparently encrypt/decrypt	259	AnyEvent will start a TLS handshake as soon as the conenction has been
234	data.	260	established and will transparently encrypt/decrypt data afterwards.
		261
		262	All TLS protocol errors will be signalled as C<EPROTO>, with an
		263	appropriate error message.
235		264
236	TLS mode requires Net::SSLeay to be installed (it will be loaded	265	TLS mode requires Net::SSLeay to be installed (it will be loaded
237	automatically when you try to create a TLS handle).	266	automatically when you try to create a TLS handle): this module doesn't
		267	have a dependency on that module, so if your module requires it, you have
		268	to add the dependency yourself.
238		269
239	Unlike TCP, TLS has a server and client side: for the TLS server side, use	270	Unlike TCP, TLS has a server and client side: for the TLS server side, use
240	C<accept>, and for the TLS client side of a connection, use C<connect>	271	C<accept>, and for the TLS client side of a connection, use C<connect>
241	mode.	272	mode.
242		273
243	You can also provide your own TLS connection object, but you have	274	You can also provide your own TLS connection object, but you have
244	to make sure that you call either C<Net::SSLeay::set_connect_state>	275	to make sure that you call either C<Net::SSLeay::set_connect_state>
245	or C<Net::SSLeay::set_accept_state> on it before you pass it to	276	or C<Net::SSLeay::set_accept_state> on it before you pass it to
246	AnyEvent::Handle.	277	AnyEvent::Handle. Also, this module will take ownership of this connection
		278	object.
247		279
		280	At some future point, AnyEvent::Handle might switch to another TLS
		281	implementation, then the option to use your own session object will go
		282	away.
		283
		284	B<IMPORTANT:> since Net::SSLeay "objects" are really only integers,
		285	passing in the wrong integer will lead to certain crash. This most often
		286	happens when one uses a stylish C<< tls => 1 >> and is surprised about the
		287	segmentation fault.
		288
248	See the C<starttls> method for when need to start TLS negotiation later.	289	See the C<< ->starttls >> method for when need to start TLS negotiation later.
249		290
250	=item tls_ctx => $ssl_ctx	291	=item tls_ctx => $anyevent_tls
251		292
252	Use the given Net::SSLeay::CTX object to create the new TLS connection	293	Use the given C<AnyEvent::TLS> object to create the new TLS connection
253	(unless a connection object was specified directly). If this parameter is	294	(unless a connection object was specified directly). If this parameter is
254	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.	295	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.
		296
		297	Instead of an object, you can also specify a hash reference with C<< key
		298	=> value >> pairs. Those will be passed to L<AnyEvent::TLS> to create a
		299	new TLS context object.
255		300
256	=item json => JSON or JSON::XS object	301	=item json => JSON or JSON::XS object
257		302
258	This is the json coder object used by the C<json> read and write types.	303	This is the json coder object used by the C<json> read and write types.
259		304
…		…
262	texts.	307	texts.
263		308
264	Note that you are responsible to depend on the JSON module if you want to	309	Note that you are responsible to depend on the JSON module if you want to
265	use this functionality, as AnyEvent does not have a dependency itself.	310	use this functionality, as AnyEvent does not have a dependency itself.
266		311
267	=item filter_r => $cb
268
269	=item filter_w => $cb
270
271	These exist, but are undocumented at this time. (They are used internally
272	by the TLS code).
273
274	=back	312	=back
275		313
276	=cut	314	=cut
277		315
278	sub new {	316	sub new {
279	my $class = shift;	317	my $class = shift;
280
281	my $self = bless { @_ }, $class;	318	my $self = bless { @_ }, $class;
282		319
283	$self->{fh} or Carp::croak "mandatory argument fh is missing";	320	$self->{fh} or Carp::croak "mandatory argument fh is missing";
284		321
285	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;	322	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;
286
287	if ($self->{tls}) {
288	require Net::SSLeay;
289	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx});
290	}
291		323
292	$self->{_activity} = AnyEvent->now;	324	$self->{_activity} = AnyEvent->now;
293	$self->_timeout;	325	$self->_timeout;
294		326
		327	$self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay};
		328
		329	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx})
		330	if $self->{tls};
		331
295	$self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain};	332	$self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain};
296	$self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay};
297		333
298	$self->start_read	334	$self->start_read
299	if $self->{on_read};	335	if $self->{on_read};
300		336
301	$self	337	$self->{fh} && $self
302	}	338	}
303		339
304	sub _shutdown {	340	sub _shutdown {
305	my ($self) = @_;	341	my ($self) = @_;
306		342
307	delete $self->{_tw};	343	delete @$self{qw(_tw _rw _ww fh wbuf on_read _queue)};
308	delete $self->{_rw};	344	$self->{_eof} = 1; # tell starttls et. al to stop trying
309	delete $self->{_ww};
310	delete $self->{fh};
311		345
312	$self->stoptls;	346	&_freetls;
313
314	delete $self->{on_read};
315	delete $self->{_queue};
316	}	347	}
317		348
318	sub _error {	349	sub _error {
319	my ($self, $errno, $fatal) = @_;	350	my ($self, $errno, $fatal, $message) = @_;
320		351
321	$self->_shutdown	352	$self->_shutdown
322	if $fatal;	353	if $fatal;
323		354
324	$! = $errno;	355	$! = $errno;
		356	$message \|\|= "$!";
325		357
326	if ($self->{on_error}) {	358	if ($self->{on_error}) {
327	$self->{on_error}($self, $fatal);	359	$self->{on_error}($self, $fatal, $message);
328	} else {	360	} elsif ($self->{fh}) {
329	Carp::croak "AnyEvent::Handle uncaught error: $!";	361	Carp::croak "AnyEvent::Handle uncaught error: $message";
330	}	362	}
331	}	363	}
332		364
333	=item $fh = $handle->fh	365	=item $fh = $handle->fh
334		366
335	This method returns the file handle of the L<AnyEvent::Handle> object.	367	This method returns the file handle used to create the L<AnyEvent::Handle> object.
336		368
337	=cut	369	=cut
338		370
339	sub fh { $_[0]{fh} }	371	sub fh { $_[0]{fh} }
340		372
…		…
358	$_[0]{on_eof} = $_[1];	390	$_[0]{on_eof} = $_[1];
359	}	391	}
360		392
361	=item $handle->on_timeout ($cb)	393	=item $handle->on_timeout ($cb)
362		394
363	Replace the current C<on_timeout> callback, or disables the callback	395	Replace the current C<on_timeout> callback, or disables the callback (but
364	(but not the timeout) if C<$cb> = C<undef>. See C<timeout> constructor	396	not the timeout) if C<$cb> = C<undef>. See the C<timeout> constructor
365	argument.	397	argument and method.
366		398
367	=cut	399	=cut
368		400
369	sub on_timeout {	401	sub on_timeout {
370	$_[0]{on_timeout} = $_[1];	402	$_[0]{on_timeout} = $_[1];
371	}	403	}
372		404
373	=item $handle->autocork ($boolean)	405	=item $handle->autocork ($boolean)
374		406
375	Enables or disables the current autocork behaviour (see C<autocork>	407	Enables or disables the current autocork behaviour (see C<autocork>
376	constructor argument).	408	constructor argument). Changes will only take effect on the next write.
377		409
378	=cut	410	=cut
		411
		412	sub autocork {
		413	$_[0]{autocork} = $_[1];
		414	}
379		415
380	=item $handle->no_delay ($boolean)	416	=item $handle->no_delay ($boolean)
381		417
382	Enables or disables the C<no_delay> setting (see constructor argument of	418	Enables or disables the C<no_delay> setting (see constructor argument of
383	the same name for details).	419	the same name for details).
…		…
476	my ($self, $cb) = @_;	512	my ($self, $cb) = @_;
477		513
478	$self->{on_drain} = $cb;	514	$self->{on_drain} = $cb;
479		515
480	$cb->($self)	516	$cb->($self)
481	if $cb && $self->{low_water_mark} >= length $self->{wbuf};	517	if $cb && $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf});
482	}	518	}
483		519
484	=item $handle->push_write ($data)	520	=item $handle->push_write ($data)
485		521
486	Queues the given scalar to be written. You can push as much data as you	522	Queues the given scalar to be written. You can push as much data as you
…		…
503	substr $self->{wbuf}, 0, $len, "";	539	substr $self->{wbuf}, 0, $len, "";
504		540
505	$self->{_activity} = AnyEvent->now;	541	$self->{_activity} = AnyEvent->now;
506		542
507	$self->{on_drain}($self)	543	$self->{on_drain}($self)
508	if $self->{low_water_mark} >= length $self->{wbuf}	544	if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf})
509	&& $self->{on_drain};	545	&& $self->{on_drain};
510		546
511	delete $self->{_ww} unless length $self->{wbuf};	547	delete $self->{_ww} unless length $self->{wbuf};
512	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	548	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
513	$self->_error ($!, 1);	549	$self->_error ($!, 1);
…		…
537		573
538	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")	574	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")
539	->($self, @_);	575	->($self, @_);
540	}	576	}
541		577
542	if ($self->{filter_w}) {	578	if ($self->{tls}) {
543	$self->{filter_w}($self, \$_[0]);	579	$self->{_tls_wbuf} .= $_[0];
		580
		581	&_dotls ($self);
544	} else {	582	} else {
545	$self->{wbuf} .= $_[0];	583	$self->{wbuf} .= $_[0];
546	$self->_drain_wbuf;	584	$self->_drain_wbuf;
547	}	585	}
548	}	586	}
…		…
565	=cut	603	=cut
566		604
567	register_write_type netstring => sub {	605	register_write_type netstring => sub {
568	my ($self, $string) = @_;	606	my ($self, $string) = @_;
569		607
570	sprintf "%d:%s,", (length $string), $string	608	(length $string) . ":$string,"
571	};	609	};
572		610
573	=item packstring => $format, $data	611	=item packstring => $format, $data
574		612
575	An octet string prefixed with an encoded length. The encoding C<$format>	613	An octet string prefixed with an encoded length. The encoding C<$format>
…		…
640		678
641	pack "w/a*", Storable::nfreeze ($ref)	679	pack "w/a*", Storable::nfreeze ($ref)
642	};	680	};
643		681
644	=back	682	=back
		683
		684	=item $handle->push_shutdown
		685
		686	Sometimes you know you want to close the socket after writing your data
		687	before it was actually written. One way to do that is to replace your
		688	C<on_drain> handler by a callback that shuts down the socket. This method
		689	is a shorthand for just that, and replaces the C<on_drain> callback with:
		690
		691	sub { shutdown $_[0]{fh}, 1 } # for push_shutdown
		692
		693	This simply shuts down the write side and signals an EOF condition to the
		694	the peer.
		695
		696	You can rely on the normal read queue and C<on_eof> handling
		697	afterwards. This is the cleanest way to close a connection.
		698
		699	=cut
		700
		701	sub push_shutdown {
		702	$_[0]->{on_drain} = sub { shutdown $_[0]{fh}, 1 };
		703	}
645		704
646	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)	705	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)
647		706
648	This function (not method) lets you add your own types to C<push_write>.	707	This function (not method) lets you add your own types to C<push_write>.
649	Whenever the given C<type> is used, C<push_write> will invoke the code	708	Whenever the given C<type> is used, C<push_write> will invoke the code
…		…
753	) {	812	) {
754	$self->_error (&Errno::ENOSPC, 1), return;	813	$self->_error (&Errno::ENOSPC, 1), return;
755	}	814	}
756		815
757	while () {	816	while () {
		817	# we need to use a separate tls read buffer, as we must not receive data while
		818	# we are draining the buffer, and this can only happen with TLS.
		819	$self->{rbuf} .= delete $self->{_tls_rbuf} if exists $self->{_tls_rbuf};
		820
758	my $len = length $self->{rbuf};	821	my $len = length $self->{rbuf};
759		822
760	if (my $cb = shift @{ $self->{_queue} }) {	823	if (my $cb = shift @{ $self->{_queue} }) {
761	unless ($cb->($self)) {	824	unless ($cb->($self)) {
762	if ($self->{_eof}) {	825	if ($self->{_eof}) {
…		…
784		847
785	last; # more data might arrive	848	last; # more data might arrive
786	}	849	}
787	} else {	850	} else {
788	# read side becomes idle	851	# read side becomes idle
789	delete $self->{_rw};	852	delete $self->{_rw} unless $self->{tls};
790	last;	853	last;
791	}	854	}
792	}	855	}
793		856
794	if ($self->{_eof}) {	857	if ($self->{_eof}) {
…		…
823		886
824	=item $handle->rbuf	887	=item $handle->rbuf
825		888
826	Returns the read buffer (as a modifiable lvalue).	889	Returns the read buffer (as a modifiable lvalue).
827		890
828	You can access the read buffer directly as the C<< ->{rbuf} >> member, if	891	You can access the read buffer directly as the C<< ->{rbuf} >>
829	you want.	892	member, if you want. However, the only operation allowed on the
		893	read buffer (apart from looking at it) is removing data from its
		894	beginning. Otherwise modifying or appending to it is not allowed and will
		895	lead to hard-to-track-down bugs.
830		896
831	NOTE: The read buffer should only be used or modified if the C<on_read>,	897	NOTE: The read buffer should only be used or modified if the C<on_read>,
832	C<push_read> or C<unshift_read> methods are used. The other read methods	898	C<push_read> or C<unshift_read> methods are used. The other read methods
833	automatically manage the read buffer.	899	automatically manage the read buffer.
834		900
…		…
1089	An octet string prefixed with an encoded length. The encoding C<$format>	1155	An octet string prefixed with an encoded length. The encoding C<$format>
1090	uses the same format as a Perl C<pack> format, but must specify a single	1156	uses the same format as a Perl C<pack> format, but must specify a single
1091	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an	1157	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an
1092	optional C<!>, C<< < >> or C<< > >> modifier).	1158	optional C<!>, C<< < >> or C<< > >> modifier).
1093		1159
1094	DNS over TCP uses a prefix of C<n>, EPP uses a prefix of C<N>.	1160	For example, DNS over TCP uses a prefix of C<n> (2 octet network order),
		1161	EPP uses a prefix of C<N> (4 octtes).
1095		1162
1096	Example: read a block of data prefixed by its length in BER-encoded	1163	Example: read a block of data prefixed by its length in BER-encoded
1097	format (very efficient).	1164	format (very efficient).
1098		1165
1099	$handle->push_read (packstring => "w", sub {	1166	$handle->push_read (packstring => "w", sub {
…		…
1129	}	1196	}
1130	};	1197	};
1131		1198
1132	=item json => $cb->($handle, $hash_or_arrayref)	1199	=item json => $cb->($handle, $hash_or_arrayref)
1133		1200
1134	Reads a JSON object or array, decodes it and passes it to the callback.	1201	Reads a JSON object or array, decodes it and passes it to the
		1202	callback. When a parse error occurs, an C<EBADMSG> error will be raised.
1135		1203
1136	If a C<json> object was passed to the constructor, then that will be used	1204	If a C<json> object was passed to the constructor, then that will be used
1137	for the final decode, otherwise it will create a JSON coder expecting UTF-8.	1205	for the final decode, otherwise it will create a JSON coder expecting UTF-8.
1138		1206
1139	This read type uses the incremental parser available with JSON version	1207	This read type uses the incremental parser available with JSON version
…		…
1148	=cut	1216	=cut
1149		1217
1150	register_read_type json => sub {	1218	register_read_type json => sub {
1151	my ($self, $cb) = @_;	1219	my ($self, $cb) = @_;
1152		1220
1153	require JSON;	1221	my $json = $self->{json} \|\|=
		1222	eval { require JSON::XS; JSON::XS->new->utf8 }
		1223	\|\| do { require JSON; JSON->new->utf8 };
1154		1224
1155	my $data;	1225	my $data;
1156	my $rbuf = \$self->{rbuf};	1226	my $rbuf = \$self->{rbuf};
1157		1227
1158	my $json = $self->{json} \|\|= JSON->new->utf8;
1159
1160	sub {	1228	sub {
1161	my $ref = $json->incr_parse ($self->{rbuf});	1229	my $ref = eval { $json->incr_parse ($self->{rbuf}) };
1162		1230
1163	if ($ref) {	1231	if ($ref) {
1164	$self->{rbuf} = $json->incr_text;	1232	$self->{rbuf} = $json->incr_text;
1165	$json->incr_text = "";	1233	$json->incr_text = "";
1166	$cb->($self, $ref);	1234	$cb->($self, $ref);
1167		1235
1168	1	1236	1
		1237	} elsif ($@) {
		1238	# error case
		1239	$json->incr_skip;
		1240
		1241	$self->{rbuf} = $json->incr_text;
		1242	$json->incr_text = "";
		1243
		1244	$self->_error (&Errno::EBADMSG);
		1245
		1246	()
1169	} else {	1247	} else {
1170	$self->{rbuf} = "";	1248	$self->{rbuf} = "";
		1249
1171	()	1250	()
1172	}	1251	}
1173	}	1252	}
1174	};	1253	};
1175		1254
…		…
1252	Note that AnyEvent::Handle will automatically C<start_read> for you when	1331	Note that AnyEvent::Handle will automatically C<start_read> for you when
1253	you change the C<on_read> callback or push/unshift a read callback, and it	1332	you change the C<on_read> callback or push/unshift a read callback, and it
1254	will automatically C<stop_read> for you when neither C<on_read> is set nor	1333	will automatically C<stop_read> for you when neither C<on_read> is set nor
1255	there are any read requests in the queue.	1334	there are any read requests in the queue.
1256		1335
		1336	These methods will have no effect when in TLS mode (as TLS doesn't support
		1337	half-duplex connections).
		1338
1257	=cut	1339	=cut
1258		1340
1259	sub stop_read {	1341	sub stop_read {
1260	my ($self) = @_;	1342	my ($self) = @_;
1261		1343
1262	delete $self->{_rw};	1344	delete $self->{_rw} unless $self->{tls};
1263	}	1345	}
1264		1346
1265	sub start_read {	1347	sub start_read {
1266	my ($self) = @_;	1348	my ($self) = @_;
1267		1349
1268	unless ($self->{_rw} \|\| $self->{_eof}) {	1350	unless ($self->{_rw} \|\| $self->{_eof}) {
1269	Scalar::Util::weaken $self;	1351	Scalar::Util::weaken $self;
1270		1352
1271	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {	1353	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {
1272	my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf};	1354	my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});
1273	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} \|\| 8192, length $$rbuf;	1355	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} \|\| 8192, length $$rbuf;
1274		1356
1275	if ($len > 0) {	1357	if ($len > 0) {
1276	$self->{_activity} = AnyEvent->now;	1358	$self->{_activity} = AnyEvent->now;
1277		1359
1278	$self->{filter_r}	1360	if ($self->{tls}) {
1279	? $self->{filter_r}($self, $rbuf)	1361	Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);
1280	: $self->{_in_drain} \|\| $self->_drain_rbuf;	1362
		1363	&_dotls ($self);
		1364	} else {
		1365	$self->_drain_rbuf unless $self->{_in_drain};
		1366	}
1281		1367
1282	} elsif (defined $len) {	1368	} elsif (defined $len) {
1283	delete $self->{_rw};	1369	delete $self->{_rw};
1284	$self->{_eof} = 1;	1370	$self->{_eof} = 1;
1285	$self->_drain_rbuf unless $self->{_in_drain};	1371	$self->_drain_rbuf unless $self->{_in_drain};
…		…
1289	}	1375	}
1290	});	1376	});
1291	}	1377	}
1292	}	1378	}
1293		1379
		1380	our $ERROR_SYSCALL;
		1381	our $ERROR_WANT_READ;
		1382	our $ERROR_ZERO_RETURN;
		1383
		1384	sub _tls_error {
		1385	my ($self, $err) = @_;
		1386
		1387	return $self->_error ($!, 1)
		1388	if $err == Net::SSLeay::ERROR_SYSCALL ();
		1389
		1390	my $err =Net::SSLeay::ERR_error_string (Net::SSLeay::ERR_get_error ());
		1391
		1392	# reduce error string to look less scary
		1393	$err =~ s/^error:[0-9a-fA-F]{8}:[^:]+:([^:]+):/\L$1: /;
		1394
		1395	$self->_error (&Errno::EPROTO, 1, $err);
		1396	}
		1397
		1398	# poll the write BIO and send the data if applicable
		1399	# also decode read data if possible
		1400	# this is basiclaly our TLS state machine
		1401	# more efficient implementations are possible with openssl,
		1402	# but not with the buggy and incomplete Net::SSLeay.
1294	sub _dotls {	1403	sub _dotls {
1295	my ($self) = @_;	1404	my ($self) = @_;
1296		1405
1297	my $buf;	1406	my $tmp;
1298		1407
1299	if (length $self->{_tls_wbuf}) {	1408	if (length $self->{_tls_wbuf}) {
1300	while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {	1409	while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {
1301	substr $self->{_tls_wbuf}, 0, $len, "";	1410	substr $self->{_tls_wbuf}, 0, $tmp, "";
1302	}	1411	}
1303	}
1304		1412
		1413	$tmp = Net::SSLeay::get_error ($self->{tls}, $tmp);
		1414	return $self->_tls_error ($tmp)
		1415	if $tmp != $ERROR_WANT_READ
		1416	&& ($tmp != $ERROR_SYSCALL \|\| $!)
		1417	&& $tmp != $ERROR_ZERO_RETURN;
		1418	}
		1419
		1420	while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) {
		1421	unless (length $tmp) {
		1422	# let's treat SSL-eof as we treat normal EOF
		1423	delete $self->{_rw};
		1424	$self->{_eof} = 1;
		1425	&_freetls;
		1426	}
		1427
		1428	$self->{_tls_rbuf} .= $tmp;
		1429	$self->_drain_rbuf unless $self->{_in_drain};
		1430	$self->{tls} or return; # tls session might have gone away in callback
		1431	}
		1432
		1433	$tmp = Net::SSLeay::get_error ($self->{tls}, -1);
		1434	return $self->_tls_error ($tmp)
		1435	if $tmp != $ERROR_WANT_READ
		1436	&& ($tmp != $ERROR_SYSCALL \|\| $!)
		1437	&& $tmp != $ERROR_ZERO_RETURN;
		1438
1305	if (length ($buf = Net::SSLeay::BIO_read ($self->{_wbio}))) {	1439	while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) {
1306	$self->{wbuf} .= $buf;	1440	$self->{wbuf} .= $tmp;
1307	$self->_drain_wbuf;	1441	$self->_drain_wbuf;
1308	}
1309
1310	while (defined ($buf = Net::SSLeay::read ($self->{tls}))) {
1311	if (length $buf) {
1312	$self->{rbuf} .= $buf;
1313	$self->_drain_rbuf unless $self->{_in_drain};
1314	} else {
1315	# let's treat SSL-eof as we treat normal EOF
1316	$self->{_eof} = 1;
1317	$self->_shutdown;
1318	return;
1319	}
1320	}
1321
1322	my $err = Net::SSLeay::get_error ($self->{tls}, -1);
1323
1324	if ($err!= Net::SSLeay::ERROR_WANT_READ ()) {
1325	if ($err == Net::SSLeay::ERROR_SYSCALL ()) {
1326	return $self->_error ($!, 1);
1327	} elsif ($err == Net::SSLeay::ERROR_SSL ()) {
1328	return $self->_error (&Errno::EIO, 1);
1329	}
1330
1331	# all others are fine for our purposes
1332	}	1442	}
1333	}	1443	}
1334		1444
1335	=item $handle->starttls ($tls[, $tls_ctx])	1445	=item $handle->starttls ($tls[, $tls_ctx])
1336		1446
…		…
1339	C<starttls>.	1449	C<starttls>.
1340		1450
1341	The first argument is the same as the C<tls> constructor argument (either	1451	The first argument is the same as the C<tls> constructor argument (either
1342	C<"connect">, C<"accept"> or an existing Net::SSLeay object).	1452	C<"connect">, C<"accept"> or an existing Net::SSLeay object).
1343		1453
1344	The second argument is the optional C<Net::SSLeay::CTX> object that is	1454	The second argument is the optional C<AnyEvent::TLS> object that is used
1345	used when AnyEvent::Handle has to create its own TLS connection object.	1455	when AnyEvent::Handle has to create its own TLS connection object, or
		1456	a hash reference with C<< key => value >> pairs that will be used to
		1457	construct a new context.
1346		1458
1347	The TLS connection object will end up in C<< $handle->{tls} >> after this	1459	The TLS connection object will end up in C<< $handle->{tls} >>, the TLS
1348	call and can be used or changed to your liking. Note that the handshake	1460	context in C<< $handle->{tls_ctx} >> after this call and can be used or
1349	might have already started when this function returns.	1461	changed to your liking. Note that the handshake might have already started
		1462	when this function returns.
1350		1463
		1464	If it an error to start a TLS handshake more than once per
		1465	AnyEvent::Handle object (this is due to bugs in OpenSSL).
		1466
1351	=cut	1467	=cut
		1468
		1469	our %TLS_CACHE; #TODO not yet documented, should we?
1352		1470
1353	sub starttls {	1471	sub starttls {
1354	my ($self, $ssl, $ctx) = @_;	1472	my ($self, $ssl, $ctx) = @_;
1355		1473
1356	$self->stoptls;	1474	require Net::SSLeay;
1357		1475
1358	if ($ssl eq "accept") {	1476	Carp::croak "it is an error to call starttls more than once on an AnyEvent::Handle object"
1359	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());	1477	if $self->{tls};
1360	Net::SSLeay::set_accept_state ($ssl);	1478
1361	} elsif ($ssl eq "connect") {	1479	$ERROR_SYSCALL = Net::SSLeay::ERROR_SYSCALL ();
1362	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());	1480	$ERROR_WANT_READ = Net::SSLeay::ERROR_WANT_READ ();
1363	Net::SSLeay::set_connect_state ($ssl);	1481	$ERROR_ZERO_RETURN = Net::SSLeay::ERROR_ZERO_RETURN ();
		1482
		1483	$ctx \|\|= $self->{tls_ctx};
		1484
		1485	if ("HASH" eq ref $ctx) {
		1486	require AnyEvent::TLS;
		1487
		1488	local $Carp::CarpLevel = 1; # skip ourselves when creating a new context
		1489
		1490	if ($ctx->{cache}) {
		1491	my $key = $ctx+0;
		1492	$ctx = $TLS_CACHE{$key} \|\|= new AnyEvent::TLS %$ctx;
		1493	} else {
		1494	$ctx = new AnyEvent::TLS %$ctx;
		1495	}
		1496	}
1364	}	1497
1365		1498	$self->{tls_ctx} = $ctx \|\| TLS_CTX ();
1366	$self->{tls} = $ssl;	1499	$self->{tls} = $ssl = $self->{tls_ctx}->_get_session ($ssl, $self, $self->{peername});
1367		1500
1368	# basically, this is deep magic (because SSL_read should have the same issues)	1501	# basically, this is deep magic (because SSL_read should have the same issues)
1369	# but the openssl maintainers basically said: "trust us, it just works".	1502	# but the openssl maintainers basically said: "trust us, it just works".
1370	# (unfortunately, we have to hardcode constants because the abysmally misdesigned	1503	# (unfortunately, we have to hardcode constants because the abysmally misdesigned
1371	# and mismaintained ssleay-module doesn't even offer them).	1504	# and mismaintained ssleay-module doesn't even offer them).
1372	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html	1505	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html
1373	#	1506	#
1374	# in short: this is a mess.	1507	# in short: this is a mess.
1375	#	1508	#
1376	# note that we do not try to kepe the length constant between writes as we are required to do.	1509	# note that we do not try to keep the length constant between writes as we are required to do.
1377	# we assume that most (but not all) of this insanity only applies to non-blocking cases,	1510	# we assume that most (but not all) of this insanity only applies to non-blocking cases,
1378	# and we drive openssl fully in blocking mode here.	1511	# and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to
		1512	# have identity issues in that area.
1379	Net::SSLeay::CTX_set_mode ($self->{tls},	1513	# Net::SSLeay::CTX_set_mode ($ssl,
1380	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } \|\| 1)	1514	# (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } \|\| 1)
1381	\| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } \|\| 2));	1515	# \| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } \|\| 2));
		1516	Net::SSLeay::CTX_set_mode ($ssl, 1\|2);
1382		1517
1383	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1518	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1384	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1519	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1385		1520
1386	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});	1521	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});
1387		1522
1388	$self->{filter_w} = sub {	1523	&_dotls; # need to trigger the initial handshake
1389	$_[0]{_tls_wbuf} .= ${$_[1]};	1524	$self->start_read; # make sure we actually do read
1390	&_dotls;
1391	};
1392	$self->{filter_r} = sub {
1393	Net::SSLeay::BIO_write ($_[0]{_rbio}, ${$_[1]});
1394	&_dotls;
1395	};
1396	}	1525	}
1397		1526
1398	=item $handle->stoptls	1527	=item $handle->stoptls
1399		1528
1400	Destroys the SSL connection, if any. Partial read or write data will be	1529	Shuts down the SSL connection - this makes a proper EOF handshake by
1401	lost.	1530	sending a close notify to the other side, but since OpenSSL doesn't
		1531	support non-blocking shut downs, it is not possible to re-use the stream
		1532	afterwards.
1402		1533
1403	=cut	1534	=cut
1404		1535
1405	sub stoptls {	1536	sub stoptls {
1406	my ($self) = @_;	1537	my ($self) = @_;
1407		1538
1408	Net::SSLeay::free (delete $self->{tls}) if $self->{tls};	1539	if ($self->{tls}) {
		1540	Net::SSLeay::shutdown ($self->{tls});
1409		1541
1410	delete $self->{_rbio};	1542	&_dotls;
1411	delete $self->{_wbio};	1543
1412	delete $self->{_tls_wbuf};	1544	# we don't give a shit. no, we do, but we can't. no...
1413	delete $self->{filter_r};	1545	# we, we... have to use openssl :/
1414	delete $self->{filter_w};	1546	&_freetls;
		1547	}
		1548	}
		1549
		1550	sub _freetls {
		1551	my ($self) = @_;
		1552
		1553	return unless $self->{tls};
		1554
		1555	$self->{tls_ctx}->_put_session (delete $self->{tls});
		1556
		1557	delete @$self{qw(_rbio _wbio _tls_wbuf)};
1415	}	1558	}
1416		1559
1417	sub DESTROY {	1560	sub DESTROY {
1418	my $self = shift;	1561	my ($self) = @_;
1419		1562
1420	$self->stoptls;	1563	&_freetls;
1421		1564
1422	my $linger = exists $self->{linger} ? $self->{linger} : 3600;	1565	my $linger = exists $self->{linger} ? $self->{linger} : 3600;
1423		1566
1424	if ($linger && length $self->{wbuf}) {	1567	if ($linger && length $self->{wbuf}) {
1425	my $fh = delete $self->{fh};	1568	my $fh = delete $self->{fh};
…		…
1440	@linger = ();	1583	@linger = ();
1441	});	1584	});
1442	}	1585	}
1443	}	1586	}
1444		1587
		1588	=item $handle->destroy
		1589
		1590	Shuts down the handle object as much as possible - this call ensures that
		1591	no further callbacks will be invoked and resources will be freed as much
		1592	as possible. You must not call any methods on the object afterwards.
		1593
		1594	Normally, you can just "forget" any references to an AnyEvent::Handle
		1595	object and it will simply shut down. This works in fatal error and EOF
		1596	callbacks, as well as code outside. It does I<NOT> work in a read or write
		1597	callback, so when you want to destroy the AnyEvent::Handle object from
		1598	within such an callback. You I<MUST> call C<< ->destroy >> explicitly in
		1599	that case.
		1600
		1601	The handle might still linger in the background and write out remaining
		1602	data, as specified by the C<linger> option, however.
		1603
		1604	=cut
		1605
		1606	sub destroy {
		1607	my ($self) = @_;
		1608
		1609	$self->DESTROY;
		1610	%$self = ();
		1611	}
		1612
1445	=item AnyEvent::Handle::TLS_CTX	1613	=item AnyEvent::Handle::TLS_CTX
1446		1614
1447	This function creates and returns the Net::SSLeay::CTX object used by	1615	This function creates and returns the AnyEvent::TLS object used by default
1448	default for TLS mode.	1616	for TLS mode.
1449		1617
1450	The context is created like this:	1618	The context is created by calling L<AnyEvent::TLS> without any arguments.
1451
1452	Net::SSLeay::load_error_strings;
1453	Net::SSLeay::SSLeay_add_ssl_algorithms;
1454	Net::SSLeay::randomize;
1455
1456	my $CTX = Net::SSLeay::CTX_new;
1457
1458	Net::SSLeay::CTX_set_options $CTX, Net::SSLeay::OP_ALL
1459		1619
1460	=cut	1620	=cut
1461		1621
1462	our $TLS_CTX;	1622	our $TLS_CTX;
1463		1623
1464	sub TLS_CTX() {	1624	sub TLS_CTX() {
1465	$TLS_CTX \|\| do {	1625	$TLS_CTX \|\|= do {
1466	require Net::SSLeay;	1626	require AnyEvent::TLS;
1467		1627
1468	Net::SSLeay::load_error_strings ();	1628	new AnyEvent::TLS
1469	Net::SSLeay::SSLeay_add_ssl_algorithms ();
1470	Net::SSLeay::randomize ();
1471
1472	$TLS_CTX = Net::SSLeay::CTX_new ();
1473
1474	Net::SSLeay::CTX_set_options ($TLS_CTX, Net::SSLeay::OP_ALL ());
1475
1476	$TLS_CTX
1477	}	1629	}
1478	}	1630	}
1479		1631
1480	=back	1632	=back
		1633
		1634
		1635	=head1 NONFREQUENTLY ASKED QUESTIONS
		1636
		1637	=over 4
		1638
		1639	=item I C<undef> the AnyEvent::Handle reference inside my callback and
		1640	still get further invocations!
		1641
		1642	That's because AnyEvent::Handle keeps a reference to itself when handling
		1643	read or write callbacks.
		1644
		1645	It is only safe to "forget" the reference inside EOF or error callbacks,
		1646	from within all other callbacks, you need to explicitly call the C<<
		1647	->destroy >> method.
		1648
		1649	=item I get different callback invocations in TLS mode/Why can't I pause
		1650	reading?
		1651
		1652	Unlike, say, TCP, TLS connections do not consist of two independent
		1653	communication channels, one for each direction. Or put differently. The
		1654	read and write directions are not independent of each other: you cannot
		1655	write data unless you are also prepared to read, and vice versa.
		1656
		1657	This can mean than, in TLS mode, you might get C<on_error> or C<on_eof>
		1658	callback invocations when you are not expecting any read data - the reason
		1659	is that AnyEvent::Handle always reads in TLS mode.
		1660
		1661	During the connection, you have to make sure that you always have a
		1662	non-empty read-queue, or an C<on_read> watcher. At the end of the
		1663	connection (or when you no longer want to use it) you can call the
		1664	C<destroy> method.
		1665
		1666	=item How do I read data until the other side closes the connection?
		1667
		1668	If you just want to read your data into a perl scalar, the easiest way
		1669	to achieve this is by setting an C<on_read> callback that does nothing,
		1670	clearing the C<on_eof> callback and in the C<on_error> callback, the data
		1671	will be in C<$_[0]{rbuf}>:
		1672
		1673	$handle->on_read (sub { });
		1674	$handle->on_eof (undef);
		1675	$handle->on_error (sub {
		1676	my $data = delete $_[0]{rbuf};
		1677	undef $handle;
		1678	});
		1679
		1680	The reason to use C<on_error> is that TCP connections, due to latencies
		1681	and packets loss, might get closed quite violently with an error, when in
		1682	fact, all data has been received.
		1683
		1684	It is usually better to use acknowledgements when transferring data,
		1685	to make sure the other side hasn't just died and you got the data
		1686	intact. This is also one reason why so many internet protocols have an
		1687	explicit QUIT command.
		1688
		1689	=item I don't want to destroy the handle too early - how do I wait until
		1690	all data has been written?
		1691
		1692	After writing your last bits of data, set the C<on_drain> callback
		1693	and destroy the handle in there - with the default setting of
		1694	C<low_water_mark> this will be called precisely when all data has been
		1695	written to the socket:
		1696
		1697	$handle->push_write (...);
		1698	$handle->on_drain (sub {
		1699	warn "all data submitted to the kernel\n";
		1700	undef $handle;
		1701	});
		1702
		1703	=back
		1704
1481		1705
1482	=head1 SUBCLASSING AnyEvent::Handle	1706	=head1 SUBCLASSING AnyEvent::Handle
1483		1707
1484	In many cases, you might want to subclass AnyEvent::Handle.	1708	In many cases, you might want to subclass AnyEvent::Handle.
1485		1709

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Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents): Revision 1.87 by root, Thu Aug 21 20:52:39 2008 UTC vs. Revision 1.137 by root, Sat Jul 4 23:58:52 2009 UTC

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Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.87 by root, Thu Aug 21 20:52:39 2008 UTC vs.
Revision 1.137 by root, Sat Jul 4 23:58:52 2009 UTC