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

Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.84 by root, Thu Aug 21 19:13:05 2008 UTC vs.
Revision 1.134 by root, Fri Jul 3 00:09:04 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 = 4.45;
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 it	258	When this parameter is given, it enables TLS (SSL) mode, that means
233	will start making 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	For the TLS server side, use C<accept>, and for the TLS client side of a	270	Unlike TCP, TLS has a server and client side: for the TLS server side, use
240	connection, use C<connect> mode.	271	C<accept>, and for the TLS client side of a connection, use C<connect>
		272	mode.
241		273
242	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
243	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>
244	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
245	AnyEvent::Handle.	277	AnyEvent::Handle. Also, this module will take ownership of this connection
		278	object.
246		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
247	See the C<starttls> method if you need to start TLS negotiation later.	289	See the C<< ->starttls >> method for when need to start TLS negotiation later.
248		290
249	=item tls_ctx => $ssl_ctx	291	=item tls_ctx => $anyevent_tls
250		292
251	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
252	(unless a connection object was specified directly). If this parameter is	294	(unless a connection object was specified directly). If this parameter is
253	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.	295	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.
254		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
255	=item json => JSON or JSON::XS object	301	=item json => JSON or JSON::XS object
256		302
257	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.
258		304
259	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
260	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.
261		308
262	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
263	use this functionality, as AnyEvent does not have a dependency itself.	310	use this functionality, as AnyEvent does not have a dependency itself.
264		311
265	=item filter_r => $cb
266
267	=item filter_w => $cb
268
269	These exist, but are undocumented at this time.
270
271	=back	312	=back
272		313
273	=cut	314	=cut
274		315
275	sub new {	316	sub new {
276	my $class = shift;	317	my $class = shift;
277
278	my $self = bless { @_ }, $class;	318	my $self = bless { @_ }, $class;
279		319
280	$self->{fh} or Carp::croak "mandatory argument fh is missing";	320	$self->{fh} or Carp::croak "mandatory argument fh is missing";
281		321
282	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;	322	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;
283
284	if ($self->{tls}) {
285	require Net::SSLeay;
286	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx});
287	}
288		323
289	$self->{_activity} = AnyEvent->now;	324	$self->{_activity} = AnyEvent->now;
290	$self->_timeout;	325	$self->_timeout;
291		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
292	$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};
293	$self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay};
294		333
295	$self->start_read	334	$self->start_read
296	if $self->{on_read};	335	if $self->{on_read};
297		336
298	$self	337	$self->{fh} && $self
299	}	338	}
300		339
301	sub _shutdown {	340	sub _shutdown {
302	my ($self) = @_;	341	my ($self) = @_;
303		342
304	delete $self->{_tw};	343	delete @$self{qw(_tw _rw _ww fh wbuf on_read _queue)};
305	delete $self->{_rw};	344	$self->{_eof} = 1; # tell starttls et. al to stop trying
306	delete $self->{_ww};
307	delete $self->{fh};
308		345
309	$self->stoptls;	346	&_freetls;
310
311	delete $self->{on_read};
312	delete $self->{_queue};
313	}	347	}
314		348
315	sub _error {	349	sub _error {
316	my ($self, $errno, $fatal) = @_;	350	my ($self, $errno, $fatal, $message) = @_;
317		351
318	$self->_shutdown	352	$self->_shutdown
319	if $fatal;	353	if $fatal;
320		354
321	$! = $errno;	355	$! = $errno;
		356	$message \|\|= "$!";
322		357
323	if ($self->{on_error}) {	358	if ($self->{on_error}) {
324	$self->{on_error}($self, $fatal);	359	$self->{on_error}($self, $fatal, $message);
325	} else {	360	} elsif ($self->{fh}) {
326	Carp::croak "AnyEvent::Handle uncaught error: $!";	361	Carp::croak "AnyEvent::Handle uncaught error: $message";
327	}	362	}
328	}	363	}
329		364
330	=item $fh = $handle->fh	365	=item $fh = $handle->fh
331		366
332	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.
333		368
334	=cut	369	=cut
335		370
336	sub fh { $_[0]{fh} }	371	sub fh { $_[0]{fh} }
337		372
…		…
355	$_[0]{on_eof} = $_[1];	390	$_[0]{on_eof} = $_[1];
356	}	391	}
357		392
358	=item $handle->on_timeout ($cb)	393	=item $handle->on_timeout ($cb)
359		394
360	Replace the current C<on_timeout> callback, or disables the callback	395	Replace the current C<on_timeout> callback, or disables the callback (but
361	(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
362	argument.	397	argument and method.
363		398
364	=cut	399	=cut
365		400
366	sub on_timeout {	401	sub on_timeout {
367	$_[0]{on_timeout} = $_[1];	402	$_[0]{on_timeout} = $_[1];
368	}	403	}
369		404
370	=item $handle->autocork ($boolean)	405	=item $handle->autocork ($boolean)
371		406
372	Enables or disables the current autocork behaviour (see C<autocork>	407	Enables or disables the current autocork behaviour (see C<autocork>
373	constructor argument).	408	constructor argument). Changes will only take effect on the next write.
374		409
375	=cut	410	=cut
		411
		412	sub autocork {
		413	$_[0]{autocork} = $_[1];
		414	}
376		415
377	=item $handle->no_delay ($boolean)	416	=item $handle->no_delay ($boolean)
378		417
379	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
380	the same name for details).	419	the same name for details).
…		…
473	my ($self, $cb) = @_;	512	my ($self, $cb) = @_;
474		513
475	$self->{on_drain} = $cb;	514	$self->{on_drain} = $cb;
476		515
477	$cb->($self)	516	$cb->($self)
478	if $cb && $self->{low_water_mark} >= length $self->{wbuf};	517	if $cb && $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf});
479	}	518	}
480		519
481	=item $handle->push_write ($data)	520	=item $handle->push_write ($data)
482		521
483	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
…		…
500	substr $self->{wbuf}, 0, $len, "";	539	substr $self->{wbuf}, 0, $len, "";
501		540
502	$self->{_activity} = AnyEvent->now;	541	$self->{_activity} = AnyEvent->now;
503		542
504	$self->{on_drain}($self)	543	$self->{on_drain}($self)
505	if $self->{low_water_mark} >= length $self->{wbuf}	544	if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf})
506	&& $self->{on_drain};	545	&& $self->{on_drain};
507		546
508	delete $self->{_ww} unless length $self->{wbuf};	547	delete $self->{_ww} unless length $self->{wbuf};
509	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	548	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
510	$self->_error ($!, 1);	549	$self->_error ($!, 1);
…		…
534		573
535	@_ = ($WH{$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")
536	->($self, @_);	575	->($self, @_);
537	}	576	}
538		577
539	if ($self->{filter_w}) {	578	if ($self->{tls}) {
540	$self->{filter_w}($self, \$_[0]);	579	$self->{_tls_wbuf} .= $_[0];
		580
		581	&_dotls ($self);
541	} else {	582	} else {
542	$self->{wbuf} .= $_[0];	583	$self->{wbuf} .= $_[0];
543	$self->_drain_wbuf;	584	$self->_drain_wbuf;
544	}	585	}
545	}	586	}
…		…
562	=cut	603	=cut
563		604
564	register_write_type netstring => sub {	605	register_write_type netstring => sub {
565	my ($self, $string) = @_;	606	my ($self, $string) = @_;
566		607
567	sprintf "%d:%s,", (length $string), $string	608	(length $string) . ":$string,"
568	};	609	};
569		610
570	=item packstring => $format, $data	611	=item packstring => $format, $data
571		612
572	An octet string prefixed with an encoded length. The encoding C<$format>	613	An octet string prefixed with an encoded length. The encoding C<$format>
…		…
637		678
638	pack "w/a*", Storable::nfreeze ($ref)	679	pack "w/a*", Storable::nfreeze ($ref)
639	};	680	};
640		681
641	=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	}
642		704
643	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)	705	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)
644		706
645	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>.
646	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
…		…
750	) {	812	) {
751	$self->_error (&Errno::ENOSPC, 1), return;	813	$self->_error (&Errno::ENOSPC, 1), return;
752	}	814	}
753		815
754	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
755	my $len = length $self->{rbuf};	821	my $len = length $self->{rbuf};
756		822
757	if (my $cb = shift @{ $self->{_queue} }) {	823	if (my $cb = shift @{ $self->{_queue} }) {
758	unless ($cb->($self)) {	824	unless ($cb->($self)) {
759	if ($self->{_eof}) {	825	if ($self->{_eof}) {
…		…
781		847
782	last; # more data might arrive	848	last; # more data might arrive
783	}	849	}
784	} else {	850	} else {
785	# read side becomes idle	851	# read side becomes idle
786	delete $self->{_rw};	852	delete $self->{_rw} unless $self->{tls};
787	last;	853	last;
788	}	854	}
789	}	855	}
790		856
791	if ($self->{_eof}) {	857	if ($self->{_eof}) {
…		…
820		886
821	=item $handle->rbuf	887	=item $handle->rbuf
822		888
823	Returns the read buffer (as a modifiable lvalue).	889	Returns the read buffer (as a modifiable lvalue).
824		890
825	You can access the read buffer directly as the C<< ->{rbuf} >> member, if	891	You can access the read buffer directly as the C<< ->{rbuf} >>
826	you want.	892	member, if you want. However, the only operation allowed on the
		893	read buffer (apart from looking at it) is removing data from its
		894	beginning. Otherwise modifying or appending to it is not allowed and will
		895	lead to hard-to-track-down bugs.
827		896
828	NOTE: The read buffer should only be used or modified if the C<on_read>,	897	NOTE: The read buffer should only be used or modified if the C<on_read>,
829	C<push_read> or C<unshift_read> methods are used. The other read methods	898	C<push_read> or C<unshift_read> methods are used. The other read methods
830	automatically manage the read buffer.	899	automatically manage the read buffer.
831		900
…		…
1086	An octet string prefixed with an encoded length. The encoding C<$format>	1155	An octet string prefixed with an encoded length. The encoding C<$format>
1087	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
1088	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an	1157	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an
1089	optional C<!>, C<< < >> or C<< > >> modifier).	1158	optional C<!>, C<< < >> or C<< > >> modifier).
1090		1159
1091	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).
1092		1162
1093	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
1094	format (very efficient).	1164	format (very efficient).
1095		1165
1096	$handle->push_read (packstring => "w", sub {	1166	$handle->push_read (packstring => "w", sub {
…		…
1126	}	1196	}
1127	};	1197	};
1128		1198
1129	=item json => $cb->($handle, $hash_or_arrayref)	1199	=item json => $cb->($handle, $hash_or_arrayref)
1130		1200
1131	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.
1132		1203
1133	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
1134	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.
1135		1206
1136	This read type uses the incremental parser available with JSON version	1207	This read type uses the incremental parser available with JSON version
…		…
1153	my $rbuf = \$self->{rbuf};	1224	my $rbuf = \$self->{rbuf};
1154		1225
1155	my $json = $self->{json} \|\|= JSON->new->utf8;	1226	my $json = $self->{json} \|\|= JSON->new->utf8;
1156		1227
1157	sub {	1228	sub {
1158	my $ref = $json->incr_parse ($self->{rbuf});	1229	my $ref = eval { $json->incr_parse ($self->{rbuf}) };
1159		1230
1160	if ($ref) {	1231	if ($ref) {
1161	$self->{rbuf} = $json->incr_text;	1232	$self->{rbuf} = $json->incr_text;
1162	$json->incr_text = "";	1233	$json->incr_text = "";
1163	$cb->($self, $ref);	1234	$cb->($self, $ref);
1164		1235
1165	1	1236	1
		1237	} elsif ($@) {
		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	()
1166	} else {	1247	} else {
1167	$self->{rbuf} = "";	1248	$self->{rbuf} = "";
		1249
1168	()	1250	()
1169	}	1251	}
1170	}	1252	}
1171	};	1253	};
1172		1254
…		…
1249	Note that AnyEvent::Handle will automatically C<start_read> for you when	1331	Note that AnyEvent::Handle will automatically C<start_read> for you when
1250	you change the C<on_read> callback or push/unshift a read callback, and it	1332	you change the C<on_read> callback or push/unshift a read callback, and it
1251	will automatically C<stop_read> for you when neither C<on_read> is set nor	1333	will automatically C<stop_read> for you when neither C<on_read> is set nor
1252	there are any read requests in the queue.	1334	there are any read requests in the queue.
1253		1335
		1336	These methods will have no effect when in TLS mode (as TLS doesn't support
		1337	half-duplex connections).
		1338
1254	=cut	1339	=cut
1255		1340
1256	sub stop_read {	1341	sub stop_read {
1257	my ($self) = @_;	1342	my ($self) = @_;
1258		1343
1259	delete $self->{_rw};	1344	delete $self->{_rw} unless $self->{tls};
1260	}	1345	}
1261		1346
1262	sub start_read {	1347	sub start_read {
1263	my ($self) = @_;	1348	my ($self) = @_;
1264		1349
1265	unless ($self->{_rw} \|\| $self->{_eof}) {	1350	unless ($self->{_rw} \|\| $self->{_eof}) {
1266	Scalar::Util::weaken $self;	1351	Scalar::Util::weaken $self;
1267		1352
1268	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {	1353	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {
1269	my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf};	1354	my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});
1270	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;
1271		1356
1272	if ($len > 0) {	1357	if ($len > 0) {
1273	$self->{_activity} = AnyEvent->now;	1358	$self->{_activity} = AnyEvent->now;
1274		1359
1275	$self->{filter_r}	1360	if ($self->{tls}) {
1276	? $self->{filter_r}($self, $rbuf)	1361	Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);
1277	: $self->{_in_drain} \|\| $self->_drain_rbuf;	1362
		1363	&_dotls ($self);
		1364	} else {
		1365	$self->_drain_rbuf unless $self->{_in_drain};
		1366	}
1278		1367
1279	} elsif (defined $len) {	1368	} elsif (defined $len) {
1280	delete $self->{_rw};	1369	delete $self->{_rw};
1281	$self->{_eof} = 1;	1370	$self->{_eof} = 1;
1282	$self->_drain_rbuf unless $self->{_in_drain};	1371	$self->_drain_rbuf unless $self->{_in_drain};
…		…
1286	}	1375	}
1287	});	1376	});
1288	}	1377	}
1289	}	1378	}
1290		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	$self->_error (&Errno::EPROTO, 1,
		1392	Net::SSLeay::ERR_error_string (Net::SSLeay::ERR_get_error ()));
		1393	}
		1394
		1395	# poll the write BIO and send the data if applicable
		1396	# also decode read data if possible
		1397	# this is basiclaly our TLS state machine
		1398	# more efficient implementations are possible with openssl,
		1399	# but not with the buggy and incomplete Net::SSLeay.
1291	sub _dotls {	1400	sub _dotls {
1292	my ($self) = @_;	1401	my ($self) = @_;
1293		1402
1294	my $buf;	1403	my $tmp;
1295		1404
1296	if (length $self->{_tls_wbuf}) {	1405	if (length $self->{_tls_wbuf}) {
1297	while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {	1406	while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {
1298	substr $self->{_tls_wbuf}, 0, $len, "";	1407	substr $self->{_tls_wbuf}, 0, $tmp, "";
1299	}	1408	}
1300	}
1301		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 != $ERROR_ZERO_RETURN;
		1435
1302	if (length ($buf = Net::SSLeay::BIO_read ($self->{_wbio}))) {	1436	while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) {
1303	$self->{wbuf} .= $buf;	1437	$self->{wbuf} .= $tmp;
1304	$self->_drain_wbuf;	1438	$self->_drain_wbuf;
1305	}
1306
1307	while (defined ($buf = Net::SSLeay::read ($self->{tls}))) {
1308	if (length $buf) {
1309	$self->{rbuf} .= $buf;
1310	$self->_drain_rbuf unless $self->{_in_drain};
1311	} else {
1312	# let's treat SSL-eof as we treat normal EOF
1313	$self->{_eof} = 1;
1314	$self->_shutdown;
1315	return;
1316	}
1317	}
1318
1319	my $err = Net::SSLeay::get_error ($self->{tls}, -1);
1320
1321	if ($err!= Net::SSLeay::ERROR_WANT_READ ()) {
1322	if ($err == Net::SSLeay::ERROR_SYSCALL ()) {
1323	return $self->_error ($!, 1);
1324	} elsif ($err == Net::SSLeay::ERROR_SSL ()) {
1325	return $self->_error (&Errno::EIO, 1);
1326	}
1327
1328	# all others are fine for our purposes
1329	}	1439	}
1330	}	1440	}
1331		1441
1332	=item $handle->starttls ($tls[, $tls_ctx])	1442	=item $handle->starttls ($tls[, $tls_ctx])
1333		1443
…		…
1336	C<starttls>.	1446	C<starttls>.
1337		1447
1338	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
1339	C<"connect">, C<"accept"> or an existing Net::SSLeay object).	1449	C<"connect">, C<"accept"> or an existing Net::SSLeay object).
1340		1450
1341	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
1342	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.
1343		1455
1344	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
1345	call and can be used or changed to your liking. Note that the handshake	1457	context in C<< $handle->{tls_ctx} >> after this call and can be used or
1346	might have already started when this function returns.	1458	changed to your liking. Note that the handshake might have already started
		1459	when this function returns.
		1460
		1461	If it an error to start a TLS handshake more than once per
		1462	AnyEvent::Handle object (this is due to bugs in OpenSSL).
1347		1463
1348	=cut	1464	=cut
1349		1465
1350	sub starttls {	1466	sub starttls {
1351	my ($self, $ssl, $ctx) = @_;	1467	my ($self, $ssl, $ctx) = @_;
1352		1468
1353	$self->stoptls;	1469	require Net::SSLeay;
1354		1470
1355	if ($ssl eq "accept") {	1471	Carp::croak "it is an error to call starttls more than once on an AnyEvent::Handle object"
1356	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());	1472	if $self->{tls};
1357	Net::SSLeay::set_accept_state ($ssl);	1473
1358	} elsif ($ssl eq "connect") {	1474	$ERROR_SYSCALL = Net::SSLeay::ERROR_SYSCALL ();
1359	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());	1475	$ERROR_WANT_READ = Net::SSLeay::ERROR_WANT_READ ();
1360	Net::SSLeay::set_connect_state ($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	}
1361	}	1486
1362		1487	$self->{tls_ctx} = $ctx \|\| TLS_CTX ();
1363	$self->{tls} = $ssl;	1488	$self->{tls} = $ssl = $self->{tls_ctx}->_get_session ($ssl, $self, $self->{peername});
1364		1489
1365	# basically, this is deep magic (because SSL_read should have the same issues)	1490	# basically, this is deep magic (because SSL_read should have the same issues)
1366	# but the openssl maintainers basically said: "trust us, it just works".	1491	# but the openssl maintainers basically said: "trust us, it just works".
1367	# (unfortunately, we have to hardcode constants because the abysmally misdesigned	1492	# (unfortunately, we have to hardcode constants because the abysmally misdesigned
1368	# and mismaintained ssleay-module doesn't even offer them).	1493	# and mismaintained ssleay-module doesn't even offer them).
1369	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html	1494	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html
		1495	#
		1496	# in short: this is a mess.
		1497	#
		1498	# note that we do not try to keep the length constant between writes as we are required to do.
		1499	# we assume that most (but not all) of this insanity only applies to non-blocking cases,
		1500	# and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to
		1501	# have identity issues in that area.
1370	Net::SSLeay::CTX_set_mode ($self->{tls},	1502	# Net::SSLeay::CTX_set_mode ($ssl,
1371	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } \|\| 1)	1503	# (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } \|\| 1)
1372	\| (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);
1373		1506
1374	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1507	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1375	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1508	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1376		1509
1377	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});	1510	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});
1378		1511
1379	$self->{filter_w} = sub {	1512	&_dotls; # need to trigger the initial handshake
1380	$_[0]{_tls_wbuf} .= ${$_[1]};	1513	$self->start_read; # make sure we actually do read
1381	&_dotls;
1382	};
1383	$self->{filter_r} = sub {
1384	Net::SSLeay::BIO_write ($_[0]{_rbio}, ${$_[1]});
1385	&_dotls;
1386	};
1387	}	1514	}
1388		1515
1389	=item $handle->stoptls	1516	=item $handle->stoptls
1390		1517
1391	Destroys the SSL connection, if any. Partial read or write data will be	1518	Shuts down the SSL connection - this makes a proper EOF handshake by
1392	lost.	1519	sending a close notify to the other side, but since OpenSSL doesn't
		1520	support non-blocking shut downs, it is not possible to re-use the stream
		1521	afterwards.
1393		1522
1394	=cut	1523	=cut
1395		1524
1396	sub stoptls {	1525	sub stoptls {
1397	my ($self) = @_;	1526	my ($self) = @_;
1398		1527
1399	Net::SSLeay::free (delete $self->{tls}) if $self->{tls};	1528	if ($self->{tls}) {
		1529	Net::SSLeay::shutdown ($self->{tls});
1400		1530
1401	delete $self->{_rbio};	1531	&_dotls;
1402	delete $self->{_wbio};	1532
1403	delete $self->{_tls_wbuf};	1533	# we don't give a shit. no, we do, but we can't. no...
1404	delete $self->{filter_r};	1534	# we, we... have to use openssl :/
1405	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)};
1406	}	1547	}
1407		1548
1408	sub DESTROY {	1549	sub DESTROY {
1409	my $self = shift;	1550	my ($self) = @_;
1410		1551
1411	$self->stoptls;	1552	&_freetls;
1412		1553
1413	my $linger = exists $self->{linger} ? $self->{linger} : 3600;	1554	my $linger = exists $self->{linger} ? $self->{linger} : 3600;
1414		1555
1415	if ($linger && length $self->{wbuf}) {	1556	if ($linger && length $self->{wbuf}) {
1416	my $fh = delete $self->{fh};	1557	my $fh = delete $self->{fh};
…		…
1431	@linger = ();	1572	@linger = ();
1432	});	1573	});
1433	}	1574	}
1434	}	1575	}
1435		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
1436	=item AnyEvent::Handle::TLS_CTX	1602	=item AnyEvent::Handle::TLS_CTX
1437		1603
1438	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
1439	default for TLS mode.	1605	for TLS mode.
1440		1606
1441	The context is created like this:	1607	The context is created by calling L<AnyEvent::TLS> without any arguments.
1442
1443	Net::SSLeay::load_error_strings;
1444	Net::SSLeay::SSLeay_add_ssl_algorithms;
1445	Net::SSLeay::randomize;
1446
1447	my $CTX = Net::SSLeay::CTX_new;
1448
1449	Net::SSLeay::CTX_set_options $CTX, Net::SSLeay::OP_ALL
1450		1608
1451	=cut	1609	=cut
1452		1610
1453	our $TLS_CTX;	1611	our $TLS_CTX;
1454		1612
1455	sub TLS_CTX() {	1613	sub TLS_CTX() {
1456	$TLS_CTX \|\| do {	1614	$TLS_CTX \|\|= do {
1457	require Net::SSLeay;	1615	require AnyEvent::TLS;
1458		1616
1459	Net::SSLeay::load_error_strings ();	1617	new AnyEvent::TLS
1460	Net::SSLeay::SSLeay_add_ssl_algorithms ();
1461	Net::SSLeay::randomize ();
1462
1463	$TLS_CTX = Net::SSLeay::CTX_new ();
1464
1465	Net::SSLeay::CTX_set_options ($TLS_CTX, Net::SSLeay::OP_ALL ());
1466
1467	$TLS_CTX
1468	}	1618	}
1469	}	1619	}
1470		1620
1471	=back	1621	=back
		1622
		1623
		1624	=head1 NONFREQUENTLY ASKED QUESTIONS
		1625
		1626	=over 4
		1627
		1628	=item I C<undef> the AnyEvent::Handle reference inside my callback and
		1629	still get further invocations!
		1630
		1631	That's because AnyEvent::Handle keeps a reference to itself when handling
		1632	read or write callbacks.
		1633
		1634	It is only safe to "forget" the reference inside EOF or error callbacks,
		1635	from within all other callbacks, you need to explicitly call the C<<
		1636	->destroy >> method.
		1637
		1638	=item I get different callback invocations in TLS mode/Why can't I pause
		1639	reading?
		1640
		1641	Unlike, say, TCP, TLS connections do not consist of two independent
		1642	communication channels, one for each direction. Or put differently. The
		1643	read and write directions are not independent of each other: you cannot
		1644	write data unless you are also prepared to read, and vice versa.
		1645
		1646	This can mean than, in TLS mode, you might get C<on_error> or C<on_eof>
		1647	callback invocations when you are not expecting any read data - the reason
		1648	is that AnyEvent::Handle always reads in TLS mode.
		1649
		1650	During the connection, you have to make sure that you always have a
		1651	non-empty read-queue, or an C<on_read> watcher. At the end of the
		1652	connection (or when you no longer want to use it) you can call the
		1653	C<destroy> method.
		1654
		1655	=item How do I read data until the other side closes the connection?
		1656
		1657	If you just want to read your data into a perl scalar, the easiest way
		1658	to achieve this is by setting an C<on_read> callback that does nothing,
		1659	clearing the C<on_eof> callback and in the C<on_error> callback, the data
		1660	will be in C<$_[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
1472		1694
1473	=head1 SUBCLASSING AnyEvent::Handle	1695	=head1 SUBCLASSING AnyEvent::Handle
1474		1696
1475	In many cases, you might want to subclass AnyEvent::Handle.	1697	In many cases, you might want to subclass AnyEvent::Handle.
1476		1698

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Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents): Revision 1.84 by root, Thu Aug 21 19:13:05 2008 UTC vs. Revision 1.134 by root, Fri Jul 3 00:09:04 2009 UTC

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Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.84 by root, Thu Aug 21 19:13:05 2008 UTC vs.
Revision 1.134 by root, Fri Jul 3 00:09:04 2009 UTC