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

Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.85 by root, Thu Aug 21 19:53:19 2008 UTC vs.
Revision 1.136 by root, Fri Jul 3 21:44:14 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>.
255		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.
		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
260	If you don't supply it, then AnyEvent::Handle will create and use a	305	If you don't supply it, then AnyEvent::Handle will create and use a
261	suitable one, which will write and expect UTF-8 encoded JSON texts.	306	suitable one (on demand), which will write and expect UTF-8 encoded JSON
		307	texts.
262		308
263	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
264	use this functionality, as AnyEvent does not have a dependency itself.	310	use this functionality, as AnyEvent does not have a dependency itself.
265		311
266	=item filter_r => $cb
267
268	=item filter_w => $cb
269
270	These exist, but are undocumented at this time.
271
272	=back	312	=back
273		313
274	=cut	314	=cut
275		315
276	sub new {	316	sub new {
277	my $class = shift;	317	my $class = shift;
278
279	my $self = bless { @_ }, $class;	318	my $self = bless { @_ }, $class;
280		319
281	$self->{fh} or Carp::croak "mandatory argument fh is missing";	320	$self->{fh} or Carp::croak "mandatory argument fh is missing";
282		321
283	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;	322	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;
284
285	if ($self->{tls}) {
286	require Net::SSLeay;
287	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx});
288	}
289		323
290	$self->{_activity} = AnyEvent->now;	324	$self->{_activity} = AnyEvent->now;
291	$self->_timeout;	325	$self->_timeout;
292		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
293	$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};
294	$self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay};
295		333
296	$self->start_read	334	$self->start_read
297	if $self->{on_read};	335	if $self->{on_read};
298		336
299	$self	337	$self->{fh} && $self
300	}	338	}
301		339
302	sub _shutdown {	340	sub _shutdown {
303	my ($self) = @_;	341	my ($self) = @_;
304		342
305	delete $self->{_tw};	343	delete @$self{qw(_tw _rw _ww fh wbuf on_read _queue)};
306	delete $self->{_rw};	344	$self->{_eof} = 1; # tell starttls et. al to stop trying
307	delete $self->{_ww};
308	delete $self->{fh};
309		345
310	$self->stoptls;	346	&_freetls;
311
312	delete $self->{on_read};
313	delete $self->{_queue};
314	}	347	}
315		348
316	sub _error {	349	sub _error {
317	my ($self, $errno, $fatal) = @_;	350	my ($self, $errno, $fatal, $message) = @_;
318		351
319	$self->_shutdown	352	$self->_shutdown
320	if $fatal;	353	if $fatal;
321		354
322	$! = $errno;	355	$! = $errno;
		356	$message \|\|= "$!";
323		357
324	if ($self->{on_error}) {	358	if ($self->{on_error}) {
325	$self->{on_error}($self, $fatal);	359	$self->{on_error}($self, $fatal, $message);
326	} else {	360	} elsif ($self->{fh}) {
327	Carp::croak "AnyEvent::Handle uncaught error: $!";	361	Carp::croak "AnyEvent::Handle uncaught error: $message";
328	}	362	}
329	}	363	}
330		364
331	=item $fh = $handle->fh	365	=item $fh = $handle->fh
332		366
333	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.
334		368
335	=cut	369	=cut
336		370
337	sub fh { $_[0]{fh} }	371	sub fh { $_[0]{fh} }
338		372
…		…
356	$_[0]{on_eof} = $_[1];	390	$_[0]{on_eof} = $_[1];
357	}	391	}
358		392
359	=item $handle->on_timeout ($cb)	393	=item $handle->on_timeout ($cb)
360		394
361	Replace the current C<on_timeout> callback, or disables the callback	395	Replace the current C<on_timeout> callback, or disables the callback (but
362	(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
363	argument.	397	argument and method.
364		398
365	=cut	399	=cut
366		400
367	sub on_timeout {	401	sub on_timeout {
368	$_[0]{on_timeout} = $_[1];	402	$_[0]{on_timeout} = $_[1];
369	}	403	}
370		404
371	=item $handle->autocork ($boolean)	405	=item $handle->autocork ($boolean)
372		406
373	Enables or disables the current autocork behaviour (see C<autocork>	407	Enables or disables the current autocork behaviour (see C<autocork>
374	constructor argument).	408	constructor argument). Changes will only take effect on the next write.
375		409
376	=cut	410	=cut
		411
		412	sub autocork {
		413	$_[0]{autocork} = $_[1];
		414	}
377		415
378	=item $handle->no_delay ($boolean)	416	=item $handle->no_delay ($boolean)
379		417
380	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
381	the same name for details).	419	the same name for details).
…		…
474	my ($self, $cb) = @_;	512	my ($self, $cb) = @_;
475		513
476	$self->{on_drain} = $cb;	514	$self->{on_drain} = $cb;
477		515
478	$cb->($self)	516	$cb->($self)
479	if $cb && $self->{low_water_mark} >= length $self->{wbuf};	517	if $cb && $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf});
480	}	518	}
481		519
482	=item $handle->push_write ($data)	520	=item $handle->push_write ($data)
483		521
484	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
…		…
501	substr $self->{wbuf}, 0, $len, "";	539	substr $self->{wbuf}, 0, $len, "";
502		540
503	$self->{_activity} = AnyEvent->now;	541	$self->{_activity} = AnyEvent->now;
504		542
505	$self->{on_drain}($self)	543	$self->{on_drain}($self)
506	if $self->{low_water_mark} >= length $self->{wbuf}	544	if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf})
507	&& $self->{on_drain};	545	&& $self->{on_drain};
508		546
509	delete $self->{_ww} unless length $self->{wbuf};	547	delete $self->{_ww} unless length $self->{wbuf};
510	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	548	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
511	$self->_error ($!, 1);	549	$self->_error ($!, 1);
…		…
535		573
536	@_ = ($WH{$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")
537	->($self, @_);	575	->($self, @_);
538	}	576	}
539		577
540	if ($self->{filter_w}) {	578	if ($self->{tls}) {
541	$self->{filter_w}($self, \$_[0]);	579	$self->{_tls_wbuf} .= $_[0];
		580
		581	&_dotls ($self);
542	} else {	582	} else {
543	$self->{wbuf} .= $_[0];	583	$self->{wbuf} .= $_[0];
544	$self->_drain_wbuf;	584	$self->_drain_wbuf;
545	}	585	}
546	}	586	}
…		…
563	=cut	603	=cut
564		604
565	register_write_type netstring => sub {	605	register_write_type netstring => sub {
566	my ($self, $string) = @_;	606	my ($self, $string) = @_;
567		607
568	sprintf "%d:%s,", (length $string), $string	608	(length $string) . ":$string,"
569	};	609	};
570		610
571	=item packstring => $format, $data	611	=item packstring => $format, $data
572		612
573	An octet string prefixed with an encoded length. The encoding C<$format>	613	An octet string prefixed with an encoded length. The encoding C<$format>
…		…
638		678
639	pack "w/a*", Storable::nfreeze ($ref)	679	pack "w/a*", Storable::nfreeze ($ref)
640	};	680	};
641		681
642	=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	}
643		704
644	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)	705	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)
645		706
646	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>.
647	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
…		…
751	) {	812	) {
752	$self->_error (&Errno::ENOSPC, 1), return;	813	$self->_error (&Errno::ENOSPC, 1), return;
753	}	814	}
754		815
755	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
756	my $len = length $self->{rbuf};	821	my $len = length $self->{rbuf};
757		822
758	if (my $cb = shift @{ $self->{_queue} }) {	823	if (my $cb = shift @{ $self->{_queue} }) {
759	unless ($cb->($self)) {	824	unless ($cb->($self)) {
760	if ($self->{_eof}) {	825	if ($self->{_eof}) {
…		…
782		847
783	last; # more data might arrive	848	last; # more data might arrive
784	}	849	}
785	} else {	850	} else {
786	# read side becomes idle	851	# read side becomes idle
787	delete $self->{_rw};	852	delete $self->{_rw} unless $self->{tls};
788	last;	853	last;
789	}	854	}
790	}	855	}
791		856
792	if ($self->{_eof}) {	857	if ($self->{_eof}) {
…		…
821		886
822	=item $handle->rbuf	887	=item $handle->rbuf
823		888
824	Returns the read buffer (as a modifiable lvalue).	889	Returns the read buffer (as a modifiable lvalue).
825		890
826	You can access the read buffer directly as the C<< ->{rbuf} >> member, if	891	You can access the read buffer directly as the C<< ->{rbuf} >>
827	you want.	892	member, if you want. However, the only operation allowed on the
		893	read buffer (apart from looking at it) is removing data from its
		894	beginning. Otherwise modifying or appending to it is not allowed and will
		895	lead to hard-to-track-down bugs.
828		896
829	NOTE: The read buffer should only be used or modified if the C<on_read>,	897	NOTE: The read buffer should only be used or modified if the C<on_read>,
830	C<push_read> or C<unshift_read> methods are used. The other read methods	898	C<push_read> or C<unshift_read> methods are used. The other read methods
831	automatically manage the read buffer.	899	automatically manage the read buffer.
832		900
…		…
1087	An octet string prefixed with an encoded length. The encoding C<$format>	1155	An octet string prefixed with an encoded length. The encoding C<$format>
1088	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
1089	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an	1157	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an
1090	optional C<!>, C<< < >> or C<< > >> modifier).	1158	optional C<!>, C<< < >> or C<< > >> modifier).
1091		1159
1092	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).
1093		1162
1094	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
1095	format (very efficient).	1164	format (very efficient).
1096		1165
1097	$handle->push_read (packstring => "w", sub {	1166	$handle->push_read (packstring => "w", sub {
…		…
1127	}	1196	}
1128	};	1197	};
1129		1198
1130	=item json => $cb->($handle, $hash_or_arrayref)	1199	=item json => $cb->($handle, $hash_or_arrayref)
1131		1200
1132	Reads a JSON object or array, decodes it and passes it to the callback.	1201	Reads a JSON object or array, decodes it and passes it to the
		1202	callback. When a parse error occurs, an C<EBADMSG> error will be raised.
1133		1203
1134	If a C<json> object was passed to the constructor, then that will be used	1204	If a C<json> object was passed to the constructor, then that will be used
1135	for the final decode, otherwise it will create a JSON coder expecting UTF-8.	1205	for the final decode, otherwise it will create a JSON coder expecting UTF-8.
1136		1206
1137	This read type uses the incremental parser available with JSON version	1207	This read type uses the incremental parser available with JSON version
…		…
1146	=cut	1216	=cut
1147		1217
1148	register_read_type json => sub {	1218	register_read_type json => sub {
1149	my ($self, $cb) = @_;	1219	my ($self, $cb) = @_;
1150		1220
1151	require JSON;	1221	my $json = $self->{json} \|\|=
		1222	eval { require JSON::XS; JSON::XS->new->utf8 }
		1223	\|\| do { require JSON; JSON->new->utf8 };
1152		1224
1153	my $data;	1225	my $data;
1154	my $rbuf = \$self->{rbuf};	1226	my $rbuf = \$self->{rbuf};
1155		1227
1156	my $json = $self->{json} \|\|= JSON->new->utf8;
1157
1158	sub {	1228	sub {
1159	my $ref = $json->incr_parse ($self->{rbuf});	1229	my $ref = eval { $json->incr_parse ($self->{rbuf}) };
1160		1230
1161	if ($ref) {	1231	if ($ref) {
1162	$self->{rbuf} = $json->incr_text;	1232	$self->{rbuf} = $json->incr_text;
1163	$json->incr_text = "";	1233	$json->incr_text = "";
1164	$cb->($self, $ref);	1234	$cb->($self, $ref);
1165		1235
1166	1	1236	1
		1237	} elsif ($@) {
		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	()
1167	} else {	1247	} else {
1168	$self->{rbuf} = "";	1248	$self->{rbuf} = "";
		1249
1169	()	1250	()
1170	}	1251	}
1171	}	1252	}
1172	};	1253	};
1173		1254
…		…
1250	Note that AnyEvent::Handle will automatically C<start_read> for you when	1331	Note that AnyEvent::Handle will automatically C<start_read> for you when
1251	you change the C<on_read> callback or push/unshift a read callback, and it	1332	you change the C<on_read> callback or push/unshift a read callback, and it
1252	will automatically C<stop_read> for you when neither C<on_read> is set nor	1333	will automatically C<stop_read> for you when neither C<on_read> is set nor
1253	there are any read requests in the queue.	1334	there are any read requests in the queue.
1254		1335
		1336	These methods will have no effect when in TLS mode (as TLS doesn't support
		1337	half-duplex connections).
		1338
1255	=cut	1339	=cut
1256		1340
1257	sub stop_read {	1341	sub stop_read {
1258	my ($self) = @_;	1342	my ($self) = @_;
1259		1343
1260	delete $self->{_rw};	1344	delete $self->{_rw} unless $self->{tls};
1261	}	1345	}
1262		1346
1263	sub start_read {	1347	sub start_read {
1264	my ($self) = @_;	1348	my ($self) = @_;
1265		1349
1266	unless ($self->{_rw} \|\| $self->{_eof}) {	1350	unless ($self->{_rw} \|\| $self->{_eof}) {
1267	Scalar::Util::weaken $self;	1351	Scalar::Util::weaken $self;
1268		1352
1269	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {	1353	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {
1270	my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf};	1354	my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});
1271	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;
1272		1356
1273	if ($len > 0) {	1357	if ($len > 0) {
1274	$self->{_activity} = AnyEvent->now;	1358	$self->{_activity} = AnyEvent->now;
1275		1359
1276	$self->{filter_r}	1360	if ($self->{tls}) {
1277	? $self->{filter_r}($self, $rbuf)	1361	Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);
1278	: $self->{_in_drain} \|\| $self->_drain_rbuf;	1362
		1363	&_dotls ($self);
		1364	} else {
		1365	$self->_drain_rbuf unless $self->{_in_drain};
		1366	}
1279		1367
1280	} elsif (defined $len) {	1368	} elsif (defined $len) {
1281	delete $self->{_rw};	1369	delete $self->{_rw};
1282	$self->{_eof} = 1;	1370	$self->{_eof} = 1;
1283	$self->_drain_rbuf unless $self->{_in_drain};	1371	$self->_drain_rbuf unless $self->{_in_drain};
…		…
1287	}	1375	}
1288	});	1376	});
1289	}	1377	}
1290	}	1378	}
1291		1379
		1380	our $ERROR_SYSCALL;
		1381	our $ERROR_WANT_READ;
		1382	our $ERROR_ZERO_RETURN;
		1383
		1384	sub _tls_error {
		1385	my ($self, $err) = @_;
		1386	warn "$err,$!\n";#d#
		1387
		1388	return $self->_error ($!, 1)
		1389	if $err == Net::SSLeay::ERROR_SYSCALL ();
		1390
		1391	$self->_error (&Errno::EPROTO, 1,
		1392	Net::SSLeay::ERR_error_string (Net::SSLeay::ERR_get_error ()));
		1393	}
		1394
		1395	# poll the write BIO and send the data if applicable
		1396	# also decode read data if possible
		1397	# this is basiclaly our TLS state machine
		1398	# more efficient implementations are possible with openssl,
		1399	# but not with the buggy and incomplete Net::SSLeay.
1292	sub _dotls {	1400	sub _dotls {
1293	my ($self) = @_;	1401	my ($self) = @_;
1294		1402
1295	my $buf;	1403	my $tmp;
1296		1404
1297	if (length $self->{_tls_wbuf}) {	1405	if (length $self->{_tls_wbuf}) {
1298	while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {	1406	while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {
1299	substr $self->{_tls_wbuf}, 0, $len, "";	1407	substr $self->{_tls_wbuf}, 0, $tmp, "";
1300	}	1408	}
1301	}
1302		1409
		1410	$tmp = Net::SSLeay::get_error ($self->{tls}, $tmp);
		1411	return $self->_tls_error ($tmp)
		1412	if $tmp != $ERROR_WANT_READ
		1413	&& ($tmp != $ERROR_SYSCALL \|\| $!)
		1414	&& $tmp != $ERROR_ZERO_RETURN;
		1415	}
		1416
		1417	while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) {
		1418	unless (length $tmp) {
		1419	# let's treat SSL-eof as we treat normal EOF
		1420	delete $self->{_rw};
		1421	$self->{_eof} = 1;
		1422	&_freetls;
		1423	}
		1424
		1425	$self->{_tls_rbuf} .= $tmp;
		1426	$self->_drain_rbuf unless $self->{_in_drain};
		1427	$self->{tls} or return; # tls session might have gone away in callback
		1428	}
		1429
		1430	$tmp = Net::SSLeay::get_error ($self->{tls}, -1);
		1431	return $self->_tls_error ($tmp)
		1432	if $tmp != $ERROR_WANT_READ
		1433	&& ($tmp != $ERROR_SYSCALL \|\| $!)
		1434	&& $tmp != $ERROR_ZERO_RETURN;
		1435
1303	if (length ($buf = Net::SSLeay::BIO_read ($self->{_wbio}))) {	1436	while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) {
1304	$self->{wbuf} .= $buf;	1437	$self->{wbuf} .= $tmp;
1305	$self->_drain_wbuf;	1438	$self->_drain_wbuf;
1306	}
1307
1308	while (defined ($buf = Net::SSLeay::read ($self->{tls}))) {
1309	if (length $buf) {
1310	$self->{rbuf} .= $buf;
1311	$self->_drain_rbuf unless $self->{_in_drain};
1312	} else {
1313	# let's treat SSL-eof as we treat normal EOF
1314	$self->{_eof} = 1;
1315	$self->_shutdown;
1316	return;
1317	}
1318	}
1319
1320	my $err = Net::SSLeay::get_error ($self->{tls}, -1);
1321
1322	if ($err!= Net::SSLeay::ERROR_WANT_READ ()) {
1323	if ($err == Net::SSLeay::ERROR_SYSCALL ()) {
1324	return $self->_error ($!, 1);
1325	} elsif ($err == Net::SSLeay::ERROR_SSL ()) {
1326	return $self->_error (&Errno::EIO, 1);
1327	}
1328
1329	# all others are fine for our purposes
1330	}	1439	}
1331	}	1440	}
1332		1441
1333	=item $handle->starttls ($tls[, $tls_ctx])	1442	=item $handle->starttls ($tls[, $tls_ctx])
1334		1443
…		…
1337	C<starttls>.	1446	C<starttls>.
1338		1447
1339	The first argument is the same as the C<tls> constructor argument (either	1448	The first argument is the same as the C<tls> constructor argument (either
1340	C<"connect">, C<"accept"> or an existing Net::SSLeay object).	1449	C<"connect">, C<"accept"> or an existing Net::SSLeay object).
1341		1450
1342	The second argument is the optional C<Net::SSLeay::CTX> object that is	1451	The second argument is the optional C<AnyEvent::TLS> object that is used
1343	used when AnyEvent::Handle has to create its own TLS connection object.	1452	when AnyEvent::Handle has to create its own TLS connection object, or
		1453	a hash reference with C<< key => value >> pairs that will be used to
		1454	construct a new context.
1344		1455
1345	The TLS connection object will end up in C<< $handle->{tls} >> after this	1456	The TLS connection object will end up in C<< $handle->{tls} >>, the TLS
1346	call and can be used or changed to your liking. Note that the handshake	1457	context in C<< $handle->{tls_ctx} >> after this call and can be used or
1347	might have already started when this function returns.	1458	changed to your liking. Note that the handshake might have already started
		1459	when this function returns.
		1460
		1461	If it an error to start a TLS handshake more than once per
		1462	AnyEvent::Handle object (this is due to bugs in OpenSSL).
1348		1463
1349	=cut	1464	=cut
1350		1465
1351	sub starttls {	1466	sub starttls {
1352	my ($self, $ssl, $ctx) = @_;	1467	my ($self, $ssl, $ctx) = @_;
1353		1468
1354	$self->stoptls;	1469	require Net::SSLeay;
1355		1470
1356	if ($ssl eq "accept") {	1471	Carp::croak "it is an error to call starttls more than once on an AnyEvent::Handle object"
1357	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());	1472	if $self->{tls};
1358	Net::SSLeay::set_accept_state ($ssl);	1473
1359	} elsif ($ssl eq "connect") {	1474	$ERROR_SYSCALL = Net::SSLeay::ERROR_SYSCALL ();
1360	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());	1475	$ERROR_WANT_READ = Net::SSLeay::ERROR_WANT_READ ();
1361	Net::SSLeay::set_connect_state ($ssl);	1476	$ERROR_ZERO_RETURN = Net::SSLeay::ERROR_ZERO_RETURN ();
		1477
		1478	$ctx \|\|= $self->{tls_ctx};
		1479
		1480	if ("HASH" eq ref $ctx) {
		1481	require AnyEvent::TLS;
		1482
		1483	local $Carp::CarpLevel = 1; # skip ourselves when creating a new context
		1484	$ctx = new AnyEvent::TLS %$ctx;
		1485	}
1362	}	1486
1363		1487	$self->{tls_ctx} = $ctx \|\| TLS_CTX ();
1364	$self->{tls} = $ssl;	1488	$self->{tls} = $ssl = $self->{tls_ctx}->_get_session ($ssl, $self, $self->{peername});
1365		1489
1366	# basically, this is deep magic (because SSL_read should have the same issues)	1490	# basically, this is deep magic (because SSL_read should have the same issues)
1367	# but the openssl maintainers basically said: "trust us, it just works".	1491	# but the openssl maintainers basically said: "trust us, it just works".
1368	# (unfortunately, we have to hardcode constants because the abysmally misdesigned	1492	# (unfortunately, we have to hardcode constants because the abysmally misdesigned
1369	# and mismaintained ssleay-module doesn't even offer them).	1493	# and mismaintained ssleay-module doesn't even offer them).
1370	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html	1494	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html
		1495	#
		1496	# in short: this is a mess.
		1497	#
		1498	# note that we do not try to keep the length constant between writes as we are required to do.
		1499	# we assume that most (but not all) of this insanity only applies to non-blocking cases,
		1500	# and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to
		1501	# have identity issues in that area.
1371	Net::SSLeay::CTX_set_mode ($self->{tls},	1502	# Net::SSLeay::CTX_set_mode ($ssl,
1372	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } \|\| 1)	1503	# (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } \|\| 1)
1373	\| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } \|\| 2));	1504	# \| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } \|\| 2));
		1505	Net::SSLeay::CTX_set_mode ($ssl, 1\|2);
1374		1506
1375	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1507	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1376	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1508	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1377		1509
1378	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});	1510	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});
1379		1511
1380	$self->{filter_w} = sub {	1512	&_dotls; # need to trigger the initial handshake
1381	$_[0]{_tls_wbuf} .= ${$_[1]};	1513	$self->start_read; # make sure we actually do read
1382	&_dotls;
1383	};
1384	$self->{filter_r} = sub {
1385	Net::SSLeay::BIO_write ($_[0]{_rbio}, ${$_[1]});
1386	&_dotls;
1387	};
1388	}	1514	}
1389		1515
1390	=item $handle->stoptls	1516	=item $handle->stoptls
1391		1517
1392	Destroys the SSL connection, if any. Partial read or write data will be	1518	Shuts down the SSL connection - this makes a proper EOF handshake by
1393	lost.	1519	sending a close notify to the other side, but since OpenSSL doesn't
		1520	support non-blocking shut downs, it is not possible to re-use the stream
		1521	afterwards.
1394		1522
1395	=cut	1523	=cut
1396		1524
1397	sub stoptls {	1525	sub stoptls {
1398	my ($self) = @_;	1526	my ($self) = @_;
1399		1527
1400	Net::SSLeay::free (delete $self->{tls}) if $self->{tls};	1528	if ($self->{tls}) {
		1529	Net::SSLeay::shutdown ($self->{tls});
1401		1530
1402	delete $self->{_rbio};	1531	&_dotls;
1403	delete $self->{_wbio};	1532
1404	delete $self->{_tls_wbuf};	1533	# we don't give a shit. no, we do, but we can't. no...
1405	delete $self->{filter_r};	1534	# we, we... have to use openssl :/
1406	delete $self->{filter_w};	1535	&_freetls;
		1536	}
		1537	}
		1538
		1539	sub _freetls {
		1540	my ($self) = @_;
		1541
		1542	return unless $self->{tls};
		1543
		1544	$self->{tls_ctx}->_put_session (delete $self->{tls});
		1545
		1546	delete @$self{qw(_rbio _wbio _tls_wbuf)};
1407	}	1547	}
1408		1548
1409	sub DESTROY {	1549	sub DESTROY {
1410	my $self = shift;	1550	my ($self) = @_;
1411		1551
1412	$self->stoptls;	1552	&_freetls;
1413		1553
1414	my $linger = exists $self->{linger} ? $self->{linger} : 3600;	1554	my $linger = exists $self->{linger} ? $self->{linger} : 3600;
1415		1555
1416	if ($linger && length $self->{wbuf}) {	1556	if ($linger && length $self->{wbuf}) {
1417	my $fh = delete $self->{fh};	1557	my $fh = delete $self->{fh};
…		…
1432	@linger = ();	1572	@linger = ();
1433	});	1573	});
1434	}	1574	}
1435	}	1575	}
1436		1576
		1577	=item $handle->destroy
		1578
		1579	Shuts down the handle object as much as possible - this call ensures that
		1580	no further callbacks will be invoked and resources will be freed as much
		1581	as possible. You must not call any methods on the object afterwards.
		1582
		1583	Normally, you can just "forget" any references to an AnyEvent::Handle
		1584	object and it will simply shut down. This works in fatal error and EOF
		1585	callbacks, as well as code outside. It does I<NOT> work in a read or write
		1586	callback, so when you want to destroy the AnyEvent::Handle object from
		1587	within such an callback. You I<MUST> call C<< ->destroy >> explicitly in
		1588	that case.
		1589
		1590	The handle might still linger in the background and write out remaining
		1591	data, as specified by the C<linger> option, however.
		1592
		1593	=cut
		1594
		1595	sub destroy {
		1596	my ($self) = @_;
		1597
		1598	$self->DESTROY;
		1599	%$self = ();
		1600	}
		1601
1437	=item AnyEvent::Handle::TLS_CTX	1602	=item AnyEvent::Handle::TLS_CTX
1438		1603
1439	This function creates and returns the Net::SSLeay::CTX object used by	1604	This function creates and returns the AnyEvent::TLS object used by default
1440	default for TLS mode.	1605	for TLS mode.
1441		1606
1442	The context is created like this:	1607	The context is created by calling L<AnyEvent::TLS> without any arguments.
1443
1444	Net::SSLeay::load_error_strings;
1445	Net::SSLeay::SSLeay_add_ssl_algorithms;
1446	Net::SSLeay::randomize;
1447
1448	my $CTX = Net::SSLeay::CTX_new;
1449
1450	Net::SSLeay::CTX_set_options $CTX, Net::SSLeay::OP_ALL
1451		1608
1452	=cut	1609	=cut
1453		1610
1454	our $TLS_CTX;	1611	our $TLS_CTX;
1455		1612
1456	sub TLS_CTX() {	1613	sub TLS_CTX() {
1457	$TLS_CTX \|\| do {	1614	$TLS_CTX \|\|= do {
1458	require Net::SSLeay;	1615	require AnyEvent::TLS;
1459		1616
1460	Net::SSLeay::load_error_strings ();	1617	new AnyEvent::TLS
1461	Net::SSLeay::SSLeay_add_ssl_algorithms ();
1462	Net::SSLeay::randomize ();
1463
1464	$TLS_CTX = Net::SSLeay::CTX_new ();
1465
1466	Net::SSLeay::CTX_set_options ($TLS_CTX, Net::SSLeay::OP_ALL ());
1467
1468	$TLS_CTX
1469	}	1618	}
1470	}	1619	}
1471		1620
1472	=back	1621	=back
		1622
		1623
		1624	=head1 NONFREQUENTLY ASKED QUESTIONS
		1625
		1626	=over 4
		1627
		1628	=item I C<undef> the AnyEvent::Handle reference inside my callback and
		1629	still get further invocations!
		1630
		1631	That's because AnyEvent::Handle keeps a reference to itself when handling
		1632	read or write callbacks.
		1633
		1634	It is only safe to "forget" the reference inside EOF or error callbacks,
		1635	from within all other callbacks, you need to explicitly call the C<<
		1636	->destroy >> method.
		1637
		1638	=item I get different callback invocations in TLS mode/Why can't I pause
		1639	reading?
		1640
		1641	Unlike, say, TCP, TLS connections do not consist of two independent
		1642	communication channels, one for each direction. Or put differently. The
		1643	read and write directions are not independent of each other: you cannot
		1644	write data unless you are also prepared to read, and vice versa.
		1645
		1646	This can mean than, in TLS mode, you might get C<on_error> or C<on_eof>
		1647	callback invocations when you are not expecting any read data - the reason
		1648	is that AnyEvent::Handle always reads in TLS mode.
		1649
		1650	During the connection, you have to make sure that you always have a
		1651	non-empty read-queue, or an C<on_read> watcher. At the end of the
		1652	connection (or when you no longer want to use it) you can call the
		1653	C<destroy> method.
		1654
		1655	=item How do I read data until the other side closes the connection?
		1656
		1657	If you just want to read your data into a perl scalar, the easiest way
		1658	to achieve this is by setting an C<on_read> callback that does nothing,
		1659	clearing the C<on_eof> callback and in the C<on_error> callback, the data
		1660	will be in C<$_[0]{rbuf}>:
		1661
		1662	$handle->on_read (sub { });
		1663	$handle->on_eof (undef);
		1664	$handle->on_error (sub {
		1665	my $data = delete $_[0]{rbuf};
		1666	undef $handle;
		1667	});
		1668
		1669	The reason to use C<on_error> is that TCP connections, due to latencies
		1670	and packets loss, might get closed quite violently with an error, when in
		1671	fact, all data has been received.
		1672
		1673	It is usually better to use acknowledgements when transferring data,
		1674	to make sure the other side hasn't just died and you got the data
		1675	intact. This is also one reason why so many internet protocols have an
		1676	explicit QUIT command.
		1677
		1678	=item I don't want to destroy the handle too early - how do I wait until
		1679	all data has been written?
		1680
		1681	After writing your last bits of data, set the C<on_drain> callback
		1682	and destroy the handle in there - with the default setting of
		1683	C<low_water_mark> this will be called precisely when all data has been
		1684	written to the socket:
		1685
		1686	$handle->push_write (...);
		1687	$handle->on_drain (sub {
		1688	warn "all data submitted to the kernel\n";
		1689	undef $handle;
		1690	});
		1691
		1692	=back
		1693
1473		1694
1474	=head1 SUBCLASSING AnyEvent::Handle	1695	=head1 SUBCLASSING AnyEvent::Handle
1475		1696
1476	In many cases, you might want to subclass AnyEvent::Handle.	1697	In many cases, you might want to subclass AnyEvent::Handle.
1477		1698

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Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents): Revision 1.85 by root, Thu Aug 21 19:53:19 2008 UTC vs. Revision 1.136 by root, Fri Jul 3 21:44:14 2009 UTC

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Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.85 by root, Thu Aug 21 19:53:19 2008 UTC vs.
Revision 1.136 by root, Fri Jul 3 21:44:14 2009 UTC