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Revision 1.43 by root, Wed May 28 23:57:38 2008 UTC vs.
Revision 1.130 by root, Mon Jun 29 21:00:32 2009 UTC

1	package AnyEvent::Handle;	1	package AnyEvent::Handle;
2		2
3	no warnings;	3	no warnings;
4	use strict;	4	use strict qw(subs vars);
5		5
6	use AnyEvent ();	6	use AnyEvent ();
7	use AnyEvent::Util qw(WSAEWOULDBLOCK);	7	use AnyEvent::Util qw(WSAEWOULDBLOCK);
8	use Scalar::Util ();	8	use Scalar::Util ();
9	use Carp ();	9	use Carp ();
10	use Fcntl ();	10	use Fcntl ();
11	use Errno qw(EAGAIN EINTR);	11	use Errno qw(EAGAIN EINTR);
12	use Time::HiRes qw(time);
13		12
14	=head1 NAME	13	=head1 NAME
15		14
16	AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent	15	AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent
17		16
18	=cut	17	=cut
19		18
20	our $VERSION = '0.04';	19	our $VERSION = 4.45;
21		20
22	=head1 SYNOPSIS	21	=head1 SYNOPSIS
23		22
24	use AnyEvent;	23	use AnyEvent;
25	use AnyEvent::Handle;	24	use AnyEvent::Handle;
…		…
28		27
29	my $handle =	28	my $handle =
30	AnyEvent::Handle->new (	29	AnyEvent::Handle->new (
31	fh => \*STDIN,	30	fh => \*STDIN,
32	on_eof => sub {	31	on_eof => sub {
33	$cv->broadcast;	32	$cv->send;
34	},	33	},
35	);	34	);
36		35
37	# send some request line	36	# send some request line
38	$handle->push_write ("getinfo\015\012");	37	$handle->push_write ("getinfo\015\012");
…		…
50		49
51	This module is a helper module to make it easier to do event-based I/O on	50	This module is a helper module to make it easier to do event-based I/O on
52	filehandles. For utility functions for doing non-blocking connects and accepts	51	filehandles. For utility functions for doing non-blocking connects and accepts
53	on sockets see L<AnyEvent::Util>.	52	on sockets see L<AnyEvent::Util>.
54		53
		54	The L<AnyEvent::Intro> tutorial contains some well-documented
		55	AnyEvent::Handle examples.
		56
55	In the following, when the documentation refers to of "bytes" then this	57	In the following, when the documentation refers to of "bytes" then this
56	means characters. As sysread and syswrite are used for all I/O, their	58	means characters. As sysread and syswrite are used for all I/O, their
57	treatment of characters applies to this module as well.	59	treatment of characters applies to this module as well.
58		60
59	All callbacks will be invoked with the handle object as their first	61	All callbacks will be invoked with the handle object as their first
…		…
71		73
72	=item fh => $filehandle [MANDATORY]	74	=item fh => $filehandle [MANDATORY]
73		75
74	The filehandle this L<AnyEvent::Handle> object will operate on.	76	The filehandle this L<AnyEvent::Handle> object will operate on.
75		77
76	NOTE: The filehandle will be set to non-blocking (using	78	NOTE: The filehandle will be set to non-blocking mode (using
77	AnyEvent::Util::fh_nonblocking).	79	C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in
		80	that mode.
78		81
79	=item on_eof => $cb->($handle)	82	=item on_eof => $cb->($handle)
80		83
81	Set the callback to be called on EOF.	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
		86	connection cleanly.
82		87
		88	For sockets, this just means that the other side has stopped sending data,
		89	you can still try to write data, and, in fact, one can return from the EOF
		90	callback and continue writing data, as only the read part has been shut
		91	down.
		92
83	While not mandatory, it is highly recommended to set an eof callback,	93	While not mandatory, it is I<highly> recommended to set an EOF callback,
84	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
85	waiting for data.	95	waiting for data.
86		96
		97	If an EOF condition has been detected but no C<on_eof> callback has been
		98	set, then a fatal error will be raised with C<$!> set to <0>.
		99
87	=item on_error => $cb->($handle)	100	=item on_error => $cb->($handle, $fatal)
88		101
89	This is the fatal error callback, that is called when, well, a fatal error	102	This is the error callback, which is called when, well, some error
90	occurs, such as not being able to resolve the hostname, failure to connect	103	occured, such as not being able to resolve the hostname, failure to
91	or a read error.	104	connect or a read error.
92		105
93	The object will not be in a usable state when this callback has been	106	Some errors are fatal (which is indicated by C<$fatal> being true). On
94	called.	107	fatal errors the handle object will be shut down and will not be usable
		108	(but you are free to look at the current C<< ->rbuf >>). Examples of fatal
		109	errors are an EOF condition with active (but unsatisifable) read watchers
		110	(C<EPIPE>) or I/O errors.
		111
		112	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
		114	when this callback is invoked. Examples of non-fatal errors are timeouts
		115	C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>).
95		116
96	On callback entrance, the value of C<$!> contains the operating system	117	On callback entrance, the value of C<$!> contains the operating system
97	error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>).	118	error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>).
98		119
99	The callback should throw an exception. If it returns, then
100	AnyEvent::Handle will C<croak> for you.
101
102	While not mandatory, it is I<highly> recommended to set this callback, as	120	While not mandatory, it is I<highly> recommended to set this callback, as
103	you will not be notified of errors otherwise. The default simply calls	121	you will not be notified of errors otherwise. The default simply calls
104	die.	122	C<croak>.
105		123
106	=item on_read => $cb->($handle)	124	=item on_read => $cb->($handle)
107		125
108	This sets the default read callback, which is called when data arrives	126	This sets the default read callback, which is called when data arrives
109	and no read request is in the queue.	127	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
		129	read buffer).
110		130
111	To access (and remove data from) the read buffer, use the C<< ->rbuf >>	131	To access (and remove data from) the read buffer, use the C<< ->rbuf >>
112	method or access the C<$handle->{rbuf}> member directly.	132	method or access the C<$handle->{rbuf}> member directly. Note that you
		133	must not enlarge or modify the read buffer, you can only remove data at
		134	the beginning from it.
113		135
114	When an EOF condition is detected then AnyEvent::Handle will first try to	136	When an EOF condition is detected then AnyEvent::Handle will first try to
115	feed all the remaining data to the queued callbacks and C<on_read> before	137	feed all the remaining data to the queued callbacks and C<on_read> before
116	calling the C<on_eof> callback. If no progress can be made, then a fatal	138	calling the C<on_eof> callback. If no progress can be made, then a fatal
117	error will be raised (with C<$!> set to C<EPIPE>).	139	error will be raised (with C<$!> set to C<EPIPE>).
…		…
121	This sets the callback that is called when the write buffer becomes empty	143	This sets the callback that is called when the write buffer becomes empty
122	(or when the callback is set and the buffer is empty already).	144	(or when the callback is set and the buffer is empty already).
123		145
124	To append to the write buffer, use the C<< ->push_write >> method.	146	To append to the write buffer, use the C<< ->push_write >> method.
125		147
		148	This callback is useful when you don't want to put all of your write data
		149	into the queue at once, for example, when you want to write the contents
		150	of some file to the socket you might not want to read the whole file into
		151	memory and push it into the queue, but instead only read more data from
		152	the file when the write queue becomes empty.
		153
126	=item timeout => $fractional_seconds	154	=item timeout => $fractional_seconds
127		155
128	If non-zero, then this enables an "inactivity" timeout: whenever this many	156	If non-zero, then this enables an "inactivity" timeout: whenever this many
129	seconds pass without a successful read or write on the underlying file	157	seconds pass without a successful read or write on the underlying file
130	handle, the C<on_timeout> callback will be invoked (and if that one is	158	handle, the C<on_timeout> callback will be invoked (and if that one is
131	missing, an C<ETIMEDOUT> errror will be raised).	159	missing, a non-fatal C<ETIMEDOUT> error will be raised).
132		160
133	Note that timeout processing is also active when you currently do not have	161	Note that timeout processing is also active when you currently do not have
134	any outstanding read or write requests: If you plan to keep the connection	162	any outstanding read or write requests: If you plan to keep the connection
135	idle then you should disable the timout temporarily or ignore the timeout	163	idle then you should disable the timout temporarily or ignore the timeout
136	in the C<on_timeout> callback.	164	in the C<on_timeout> callback, in which case AnyEvent::Handle will simply
		165	restart the timeout.
137		166
138	Zero (the default) disables this timeout.	167	Zero (the default) disables this timeout.
139		168
140	=item on_timeout => $cb->($handle)	169	=item on_timeout => $cb->($handle)
141		170
…		…
145		174
146	=item rbuf_max => <bytes>	175	=item rbuf_max => <bytes>
147		176
148	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)	177	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)
149	when the read buffer ever (strictly) exceeds this size. This is useful to	178	when the read buffer ever (strictly) exceeds this size. This is useful to
150	avoid denial-of-service attacks.	179	avoid some forms of denial-of-service attacks.
151		180
152	For example, a server accepting connections from untrusted sources should	181	For example, a server accepting connections from untrusted sources should
153	be configured to accept only so-and-so much data that it cannot act on	182	be configured to accept only so-and-so much data that it cannot act on
154	(for example, when expecting a line, an attacker could send an unlimited	183	(for example, when expecting a line, an attacker could send an unlimited
155	amount of data without a callback ever being called as long as the line	184	amount of data without a callback ever being called as long as the line
156	isn't finished).	185	isn't finished).
157		186
		187	=item autocork => <boolean>
		188
		189	When disabled (the default), then C<push_write> will try to immediately
		190	write the data to the handle, if possible. This avoids having to register
		191	a write watcher and wait for the next event loop iteration, but can
		192	be inefficient if you write multiple small chunks (on the wire, this
		193	disadvantage is usually avoided by your kernel's nagle algorithm, see
		194	C<no_delay>, but this option can save costly syscalls).
		195
		196	When enabled, then writes will always be queued till the next event loop
		197	iteration. This is efficient when you do many small writes per iteration,
		198	but less efficient when you do a single write only per iteration (or when
		199	the write buffer often is full). It also increases write latency.
		200
		201	=item no_delay => <boolean>
		202
		203	When doing small writes on sockets, your operating system kernel might
		204	wait a bit for more data before actually sending it out. This is called
		205	the Nagle algorithm, and usually it is beneficial.
		206
		207	In some situations you want as low a delay as possible, which can be
		208	accomplishd by setting this option to a true value.
		209
		210	The default is your opertaing system's default behaviour (most likely
		211	enabled), this option explicitly enables or disables it, if possible.
		212
158	=item read_size => <bytes>	213	=item read_size => <bytes>
159		214
160	The default read block size (the amount of bytes this module will try to read	215	The default read block size (the amount of bytes this module will
161	on each [loop iteration). Default: C<4096>.	216	try to read during each loop iteration, which affects memory
		217	requirements). Default: C<8192>.
162		218
163	=item low_water_mark => <bytes>	219	=item low_water_mark => <bytes>
164		220
165	Sets the amount of bytes (default: C<0>) that make up an "empty" write	221	Sets the amount of bytes (default: C<0>) that make up an "empty" write
166	buffer: If the write reaches this size or gets even samller it is	222	buffer: If the write reaches this size or gets even samller it is
167	considered empty.	223	considered empty.
168		224
		225	Sometimes it can be beneficial (for performance reasons) to add data to
		226	the write buffer before it is fully drained, but this is a rare case, as
		227	the operating system kernel usually buffers data as well, so the default
		228	is good in almost all cases.
		229
		230	=item linger => <seconds>
		231
		232	If non-zero (default: C<3600>), then the destructor of the
		233	AnyEvent::Handle object will check whether there is still outstanding
		234	write data and will install a watcher that will write this data to the
		235	socket. No errors will be reported (this mostly matches how the operating
		236	system treats outstanding data at socket close time).
		237
		238	This will not work for partial TLS data that could not be encoded
		239	yet. This data will be lost. Calling the C<stoptls> method in time might
		240	help.
		241
169	=item tls => "accept" | "connect" | Net::SSLeay::SSL object	242	=item tls => "accept" | "connect" | Net::SSLeay::SSL object
170		243
171	When this parameter is given, it enables TLS (SSL) mode, that means it	244	When this parameter is given, it enables TLS (SSL) mode, that means
172	will start making tls handshake and will transparently encrypt/decrypt	245	AnyEvent will start a TLS handshake as soon as the conenction has been
173	data.	246	established and will transparently encrypt/decrypt data afterwards.
174		247
175	TLS mode requires Net::SSLeay to be installed (it will be loaded	248	TLS mode requires Net::SSLeay to be installed (it will be loaded
176	automatically when you try to create a TLS handle).	249	automatically when you try to create a TLS handle): this module doesn't
		250	have a dependency on that module, so if your module requires it, you have
		251	to add the dependency yourself.
177		252
178	For the TLS server side, use C<accept>, and for the TLS client side of a	253	Unlike TCP, TLS has a server and client side: for the TLS server side, use
179	connection, use C<connect> mode.	254	C<accept>, and for the TLS client side of a connection, use C<connect>
		255	mode.
180		256
181	You can also provide your own TLS connection object, but you have	257	You can also provide your own TLS connection object, but you have
182	to make sure that you call either C<Net::SSLeay::set_connect_state>	258	to make sure that you call either C<Net::SSLeay::set_connect_state>
183	or C<Net::SSLeay::set_accept_state> on it before you pass it to	259	or C<Net::SSLeay::set_accept_state> on it before you pass it to
184	AnyEvent::Handle.	260	AnyEvent::Handle.
185		261
		262	B<IMPORTANT:> since Net::SSLeay "objects" are really only integers,
		263	passing in the wrong integer will lead to certain crash. This most often
		264	happens when one uses a stylish C<< tls => 1 >> and is surprised about the
		265	segmentation fault.
		266
186	See the C<starttls> method if you need to start TLs negotiation later.	267	See the C<< ->starttls >> method for when need to start TLS negotiation later.
187		268
188	=item tls_ctx => $ssl_ctx	269	=item tls_ctx => $ssl_ctx
189		270
190	Use the given Net::SSLeay::CTX object to create the new TLS connection	271	Use the given C<Net::SSLeay::CTX> object to create the new TLS connection
191	(unless a connection object was specified directly). If this parameter is	272	(unless a connection object was specified directly). If this parameter is
192	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.	273	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.
193		274
194	=item json => JSON or JSON::XS object	275	=item json => JSON or JSON::XS object
195		276
196	This is the json coder object used by the C<json> read and write types.	277	This is the json coder object used by the C<json> read and write types.
197		278
198	If you don't supply it, then AnyEvent::Handle will create and use a	279	If you don't supply it, then AnyEvent::Handle will create and use a
199	suitable one, which will write and expect UTF-8 encoded JSON texts.	280	suitable one (on demand), which will write and expect UTF-8 encoded JSON
		281	texts.
200		282
201	Note that you are responsible to depend on the JSON module if you want to	283	Note that you are responsible to depend on the JSON module if you want to
202	use this functionality, as AnyEvent does not have a dependency itself.	284	use this functionality, as AnyEvent does not have a dependency itself.
203		285
204	=item filter_r => $cb
205
206	=item filter_w => $cb
207
208	These exist, but are undocumented at this time.
209
210	=back	286	=back
211		287
212	=cut	288	=cut
213		289
214	sub new {	290	sub new {
…		…
218		294
219	$self->{fh} or Carp::croak "mandatory argument fh is missing";	295	$self->{fh} or Carp::croak "mandatory argument fh is missing";
220		296
221	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;	297	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;
222		298
223	if ($self->{tls}) {
224	require Net::SSLeay;
225	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx});	299	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx})
226	}	300	if $self->{tls};
227		301
228	# $self->on_eof (delete $self->{on_eof} ) if $self->{on_eof}; # nop
229	# $self->on_error (delete $self->{on_error}) if $self->{on_error}; # nop
230	# $self->on_read (delete $self->{on_read} ) if $self->{on_read}; # nop
231	$self->on_drain (delete $self->{on_drain}) if $self->{on_drain};
232
233	$self->{_activity} = time;	302	$self->{_activity} = AnyEvent->now;
234	$self->_timeout;	303	$self->_timeout;
235		304
		305	$self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain};
		306	$self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay};
		307
236	$self->start_read;	308	$self->start_read
		309	if $self->{on_read};
237		310
238	$self	311	$self
239	}	312	}
240		313
241	sub _shutdown {	314	sub _shutdown {
242	my ($self) = @_;	315	my ($self) = @_;
243		316
244	delete $self->{_rw};	317	delete @$self{qw(_tw _rw _ww fh rbuf wbuf on_read _queue)};
245	delete $self->{_ww};
246	delete $self->{fh};
247	}
248		318
		319	&_freetls;
		320	}
		321
249	sub error {	322	sub _error {
250	my ($self) = @_;	323	my ($self, $errno, $fatal) = @_;
251		324
252	{
253	local $!;
254	$self->_shutdown;	325	$self->_shutdown
255	}	326	if $fatal;
256		327
257	$self->{on_error}($self)	328	$! = $errno;
		329
258	if $self->{on_error};	330	if ($self->{on_error}) {
259		331	$self->{on_error}($self, $fatal);
		332	} elsif ($self->{fh}) {
260	Carp::croak "AnyEvent::Handle uncaught fatal error: $!";	333	Carp::croak "AnyEvent::Handle uncaught error: $!";
		334	}
261	}	335	}
262		336
263	=item $fh = $handle->fh	337	=item $fh = $handle->fh
264		338
265	This method returns the file handle of the L<AnyEvent::Handle> object.	339	This method returns the file handle used to create the L<AnyEvent::Handle> object.
266		340
267	=cut	341	=cut
268		342
269	sub fh { $_[0]{fh} }	343	sub fh { $_[0]{fh} }
270		344
…		…
288	$_[0]{on_eof} = $_[1];	362	$_[0]{on_eof} = $_[1];
289	}	363	}
290		364
291	=item $handle->on_timeout ($cb)	365	=item $handle->on_timeout ($cb)
292		366
293	Replace the current C<on_timeout> callback, or disables the callback	367	Replace the current C<on_timeout> callback, or disables the callback (but
294	(but not the timeout) if C<$cb> = C<undef>. See C<timeout> constructor	368	not the timeout) if C<$cb> = C<undef>. See the C<timeout> constructor
295	argument.	369	argument and method.
296		370
297	=cut	371	=cut
298		372
299	sub on_timeout {	373	sub on_timeout {
300	$_[0]{on_timeout} = $_[1];	374	$_[0]{on_timeout} = $_[1];
		375	}
		376
		377	=item $handle->autocork ($boolean)
		378
		379	Enables or disables the current autocork behaviour (see C<autocork>
		380	constructor argument). Changes will only take effect on the next write.
		381
		382	=cut
		383
		384	sub autocork {
		385	$_[0]{autocork} = $_[1];
		386	}
		387
		388	=item $handle->no_delay ($boolean)
		389
		390	Enables or disables the C<no_delay> setting (see constructor argument of
		391	the same name for details).
		392
		393	=cut
		394
		395	sub no_delay {
		396	$_[0]{no_delay} = $_[1];
		397
		398	eval {
		399	local $SIG{__DIE__};
		400	setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1];
		401	};
301	}	402	}
302		403
303	#############################################################################	404	#############################################################################
304		405
305	=item $handle->timeout ($seconds)	406	=item $handle->timeout ($seconds)
…		…
319	# also check for time-outs	420	# also check for time-outs
320	sub _timeout {	421	sub _timeout {
321	my ($self) = @_;	422	my ($self) = @_;
322		423
323	if ($self->{timeout}) {	424	if ($self->{timeout}) {
324	my $NOW = time;	425	my $NOW = AnyEvent->now;
325		426
326	# when would the timeout trigger?	427	# when would the timeout trigger?
327	my $after = $self->{_activity} + $self->{timeout} - $NOW;	428	my $after = $self->{_activity} + $self->{timeout} - $NOW;
328
329	warn "next to in $after\n";#d#
330		429
331	# now or in the past already?	430	# now or in the past already?
332	if ($after <= 0) {	431	if ($after <= 0) {
333	$self->{_activity} = $NOW;	432	$self->{_activity} = $NOW;
334		433
335	if ($self->{on_timeout}) {	434	if ($self->{on_timeout}) {
336	$self->{on_timeout}->($self);	435	$self->{on_timeout}($self);
337	} else {	436	} else {
338	$! = Errno::ETIMEDOUT;	437	$self->_error (&Errno::ETIMEDOUT);
339	$self->error;
340	}	438	}
341		439
342	# callbakx could have changed timeout value, optimise	440	# callback could have changed timeout value, optimise
343	return unless $self->{timeout};	441	return unless $self->{timeout};
344		442
345	# calculate new after	443	# calculate new after
346	$after = $self->{timeout};	444	$after = $self->{timeout};
347	}	445	}
348		446
349	Scalar::Util::weaken $self;	447	Scalar::Util::weaken $self;
		448	return unless $self; # ->error could have destroyed $self
350		449
351	warn "after $after\n";#d#
352	$self->{_tw} ||= AnyEvent->timer (after => $after, cb => sub {	450	$self->{_tw} ||= AnyEvent->timer (after => $after, cb => sub {
353	delete $self->{_tw};	451	delete $self->{_tw};
354	$self->_timeout;	452	$self->_timeout;
355	});	453	});
356	} else {	454	} else {
…		…
386	my ($self, $cb) = @_;	484	my ($self, $cb) = @_;
387		485
388	$self->{on_drain} = $cb;	486	$self->{on_drain} = $cb;
389		487
390	$cb->($self)	488	$cb->($self)
391	if $cb && $self->{low_water_mark} >= length $self->{wbuf};	489	if $cb && $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf});
392	}	490	}
393		491
394	=item $handle->push_write ($data)	492	=item $handle->push_write ($data)
395		493
396	Queues the given scalar to be written. You can push as much data as you	494	Queues the given scalar to be written. You can push as much data as you
…		…
410	my $len = syswrite $self->{fh}, $self->{wbuf};	508	my $len = syswrite $self->{fh}, $self->{wbuf};
411		509
412	if ($len >= 0) {	510	if ($len >= 0) {
413	substr $self->{wbuf}, 0, $len, "";	511	substr $self->{wbuf}, 0, $len, "";
414		512
415	$self->{_activity} = time;	513	$self->{_activity} = AnyEvent->now;
416		514
417	$self->{on_drain}($self)	515	$self->{on_drain}($self)
418	if $self->{low_water_mark} >= length $self->{wbuf}	516	if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf})
419	&& $self->{on_drain};	517	&& $self->{on_drain};
420		518
421	delete $self->{_ww} unless length $self->{wbuf};	519	delete $self->{_ww} unless length $self->{wbuf};
422	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	520	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
423	$self->error;	521	$self->_error ($!, 1);
424	}	522	}
425	};	523	};
426		524
427	# try to write data immediately	525	# try to write data immediately
428	$cb->();	526	$cb->() unless $self->{autocork};
429		527
430	# if still data left in wbuf, we need to poll	528	# if still data left in wbuf, we need to poll
431	$self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb)	529	$self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb)
432	if length $self->{wbuf};	530	if length $self->{wbuf};
433	};	531	};
…		…
447		545
448	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")	546	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")
449	->($self, @_);	547	->($self, @_);
450	}	548	}
451		549
452	if ($self->{filter_w}) {	550	if ($self->{tls}) {
453	$self->{filter_w}->($self, \$_[0]);	551	$self->{_tls_wbuf} .= $_[0];
		552
		553	&_dotls ($self);
454	} else {	554	} else {
455	$self->{wbuf} .= $_[0];	555	$self->{wbuf} .= $_[0];
456	$self->_drain_wbuf;	556	$self->_drain_wbuf;
457	}	557	}
458	}	558	}
459		559
460	=item $handle->push_write (type => @args)	560	=item $handle->push_write (type => @args)
461		561
462	=item $handle->unshift_write (type => @args)
463
464	Instead of formatting your data yourself, you can also let this module do	562	Instead of formatting your data yourself, you can also let this module do
465	the job by specifying a type and type-specific arguments.	563	the job by specifying a type and type-specific arguments.
466		564
467	Predefined types are (if you have ideas for additional types, feel free to	565	Predefined types are (if you have ideas for additional types, feel free to
468	drop by and tell us):	566	drop by and tell us):
…		…
472	=item netstring => $string	570	=item netstring => $string
473		571
474	Formats the given value as netstring	572	Formats the given value as netstring
475	(http://cr.yp.to/proto/netstrings.txt, this is not a recommendation to use them).	573	(http://cr.yp.to/proto/netstrings.txt, this is not a recommendation to use them).
476		574
477	=back
478
479	=cut	575	=cut
480		576
481	register_write_type netstring => sub {	577	register_write_type netstring => sub {
482	my ($self, $string) = @_;	578	my ($self, $string) = @_;
483		579
484	sprintf "%d:%s,", (length $string), $string	580	(length $string) . ":$string,"
		581	};
		582
		583	=item packstring => $format, $data
		584
		585	An octet string prefixed with an encoded length. The encoding C<$format>
		586	uses the same format as a Perl C<pack> format, but must specify a single
		587	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an
		588	optional C<!>, C<< < >> or C<< > >> modifier).
		589
		590	=cut
		591
		592	register_write_type packstring => sub {
		593	my ($self, $format, $string) = @_;
		594
		595	pack "$format/a*", $string
485	};	596	};
486		597
487	=item json => $array_or_hashref	598	=item json => $array_or_hashref
488		599
489	Encodes the given hash or array reference into a JSON object. Unless you	600	Encodes the given hash or array reference into a JSON object. Unless you
…		…
523		634
524	$self->{json} ? $self->{json}->encode ($ref)	635	$self->{json} ? $self->{json}->encode ($ref)
525	: JSON::encode_json ($ref)	636	: JSON::encode_json ($ref)
526	};	637	};
527		638
		639	=item storable => $reference
		640
		641	Freezes the given reference using L<Storable> and writes it to the
		642	handle. Uses the C<nfreeze> format.
		643
		644	=cut
		645
		646	register_write_type storable => sub {
		647	my ($self, $ref) = @_;
		648
		649	require Storable;
		650
		651	pack "w/a*", Storable::nfreeze ($ref)
		652	};
		653
		654	=back
		655
528	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)	656	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)
529		657
530	This function (not method) lets you add your own types to C<push_write>.	658	This function (not method) lets you add your own types to C<push_write>.
531	Whenever the given C<type> is used, C<push_write> will invoke the code	659	Whenever the given C<type> is used, C<push_write> will invoke the code
532	reference with the handle object and the remaining arguments.	660	reference with the handle object and the remaining arguments.
…		…
552	ways, the "simple" way, using only C<on_read> and the "complex" way, using	680	ways, the "simple" way, using only C<on_read> and the "complex" way, using
553	a queue.	681	a queue.
554		682
555	In the simple case, you just install an C<on_read> callback and whenever	683	In the simple case, you just install an C<on_read> callback and whenever
556	new data arrives, it will be called. You can then remove some data (if	684	new data arrives, it will be called. You can then remove some data (if
557	enough is there) from the read buffer (C<< $handle->rbuf >>) if you want	685	enough is there) from the read buffer (C<< $handle->rbuf >>). Or you cna
558	or not.	686	leave the data there if you want to accumulate more (e.g. when only a
		687	partial message has been received so far).
559		688
560	In the more complex case, you want to queue multiple callbacks. In this	689	In the more complex case, you want to queue multiple callbacks. In this
561	case, AnyEvent::Handle will call the first queued callback each time new	690	case, AnyEvent::Handle will call the first queued callback each time new
562	data arrives and removes it when it has done its job (see C<push_read>,	691	data arrives (also the first time it is queued) and removes it when it has
563	below).	692	done its job (see C<push_read>, below).
564		693
565	This way you can, for example, push three line-reads, followed by reading	694	This way you can, for example, push three line-reads, followed by reading
566	a chunk of data, and AnyEvent::Handle will execute them in order.	695	a chunk of data, and AnyEvent::Handle will execute them in order.
567		696
568	Example 1: EPP protocol parser. EPP sends 4 byte length info, followed by	697	Example 1: EPP protocol parser. EPP sends 4 byte length info, followed by
569	the specified number of bytes which give an XML datagram.	698	the specified number of bytes which give an XML datagram.
570		699
571	# in the default state, expect some header bytes	700	# in the default state, expect some header bytes
572	$handle->on_read (sub {	701	$handle->on_read (sub {
573	# some data is here, now queue the length-header-read (4 octets)	702	# some data is here, now queue the length-header-read (4 octets)
574	shift->unshift_read_chunk (4, sub {	703	shift->unshift_read (chunk => 4, sub {
575	# header arrived, decode	704	# header arrived, decode
576	my $len = unpack "N", $_[1];	705	my $len = unpack "N", $_[1];
577		706
578	# now read the payload	707	# now read the payload
579	shift->unshift_read_chunk ($len, sub {	708	shift->unshift_read (chunk => $len, sub {
580	my $xml = $_[1];	709	my $xml = $_[1];
581	# handle xml	710	# handle xml
582	});	711	});
583	});	712	});
584	});	713	});
585		714
586	Example 2: Implement a client for a protocol that replies either with	715	Example 2: Implement a client for a protocol that replies either with "OK"
587	"OK" and another line or "ERROR" for one request, and 64 bytes for the	716	and another line or "ERROR" for the first request that is sent, and 64
588	second request. Due tot he availability of a full queue, we can just	717	bytes for the second request. Due to the availability of a queue, we can
589	pipeline sending both requests and manipulate the queue as necessary in	718	just pipeline sending both requests and manipulate the queue as necessary
590	the callbacks:	719	in the callbacks.
591		720
592	# request one	721	When the first callback is called and sees an "OK" response, it will
		722	C<unshift> another line-read. This line-read will be queued I<before> the
		723	64-byte chunk callback.
		724
		725	# request one, returns either "OK + extra line" or "ERROR"
593	$handle->push_write ("request 1\015\012");	726	$handle->push_write ("request 1\015\012");
594		727
595	# we expect "ERROR" or "OK" as response, so push a line read	728	# we expect "ERROR" or "OK" as response, so push a line read
596	$handle->push_read_line (sub {	729	$handle->push_read (line => sub {
597	# if we got an "OK", we have to _prepend_ another line,	730	# if we got an "OK", we have to _prepend_ another line,
598	# so it will be read before the second request reads its 64 bytes	731	# so it will be read before the second request reads its 64 bytes
599	# which are already in the queue when this callback is called	732	# which are already in the queue when this callback is called
600	# we don't do this in case we got an error	733	# we don't do this in case we got an error
601	if ($_[1] eq "OK") {	734	if ($_[1] eq "OK") {
602	$_[0]->unshift_read_line (sub {	735	$_[0]->unshift_read (line => sub {
603	my $response = $_[1];	736	my $response = $_[1];
604	...	737	...
605	});	738	});
606	}	739	}
607	});	740	});
608		741
609	# request two	742	# request two, simply returns 64 octets
610	$handle->push_write ("request 2\015\012");	743	$handle->push_write ("request 2\015\012");
611		744
612	# simply read 64 bytes, always	745	# simply read 64 bytes, always
613	$handle->push_read_chunk (64, sub {	746	$handle->push_read (chunk => 64, sub {
614	my $response = $_[1];	747	my $response = $_[1];
615	...	748	...
616	});	749	});
617		750
618	=over 4	751	=over 4
619		752
620	=cut	753	=cut
621		754
622	sub _drain_rbuf {	755	sub _drain_rbuf {
623	my ($self) = @_;	756	my ($self) = @_;
		757
		758	local $self->{_in_drain} = 1;
624		759
625	if (	760	if (
626	defined $self->{rbuf_max}	761	defined $self->{rbuf_max}
627	&& $self->{rbuf_max} < length $self->{rbuf}	762	&& $self->{rbuf_max} < length $self->{rbuf}
628	) {	763	) {
629	$! = &Errno::ENOSPC;	764	$self->_error (&Errno::ENOSPC, 1), return;
630	$self->error;
631	}	765	}
632		766
633	return if $self->{in_drain};	767	while () {
634	local $self->{in_drain} = 1;	768	# we need to use a separate tls read buffer, as we must not receive data while
		769	# we are draining the buffer, and this can only happen with TLS.
		770	$self->{rbuf} .= delete $self->{_tls_rbuf} if exists $self->{_tls_rbuf};
635		771
636	while (my $len = length $self->{rbuf}) {	772	my $len = length $self->{rbuf};
637	no strict 'refs';	773
638	if (my $cb = shift @{ $self->{_queue} }) {	774	if (my $cb = shift @{ $self->{_queue} }) {
639	unless ($cb->($self)) {	775	unless ($cb->($self)) {
640	if ($self->{_eof}) {	776	if ($self->{_eof}) {
641	# no progress can be made (not enough data and no data forthcoming)	777	# no progress can be made (not enough data and no data forthcoming)
642	$! = &Errno::EPIPE;	778	$self->_error (&Errno::EPIPE, 1), return;
643	$self->error;
644	}	779	}
645		780
646	unshift @{ $self->{_queue} }, $cb;	781	unshift @{ $self->{_queue} }, $cb;
647	return;	782	last;
648	}	783	}
649	} elsif ($self->{on_read}) {	784	} elsif ($self->{on_read}) {
		785	last unless $len;
		786
650	$self->{on_read}($self);	787	$self->{on_read}($self);
651		788
652	if (	789	if (
653	$self->{_eof} # if no further data will arrive
654	&& $len == length $self->{rbuf} # and no data has been consumed	790	$len == length $self->{rbuf} # if no data has been consumed
655	&& !@{ $self->{_queue} } # and the queue is still empty	791	&& !@{ $self->{_queue} } # and the queue is still empty
656	&& $self->{on_read} # and we still want to read data	792	&& $self->{on_read} # but we still have on_read
657	) {	793	) {
		794	# no further data will arrive
658	# then no progress can be made	795	# so no progress can be made
659	$! = &Errno::EPIPE;	796	$self->_error (&Errno::EPIPE, 1), return
660	$self->error;	797	if $self->{_eof};
		798
		799	last; # more data might arrive
661	}	800	}
662	} else {	801	} else {
663	# read side becomes idle	802	# read side becomes idle
664	delete $self->{_rw};	803	delete $self->{_rw} unless $self->{tls};
665	return;	804	last;
666	}	805	}
667	}	806	}
668		807
669	if ($self->{_eof}) {	808	if ($self->{_eof}) {
670	$self->_shutdown;	809	if ($self->{on_eof}) {
671	$self->{on_eof}($self)	810	$self->{on_eof}($self)
672	if $self->{on_eof};	811	} else {
		812	$self->_error (0, 1);
		813	}
		814	}
		815
		816	# may need to restart read watcher
		817	unless ($self->{_rw}) {
		818	$self->start_read
		819	if $self->{on_read} || @{ $self->{_queue} };
673	}	820	}
674	}	821	}
675		822
676	=item $handle->on_read ($cb)	823	=item $handle->on_read ($cb)
677		824
…		…
683		830
684	sub on_read {	831	sub on_read {
685	my ($self, $cb) = @_;	832	my ($self, $cb) = @_;
686		833
687	$self->{on_read} = $cb;	834	$self->{on_read} = $cb;
		835	$self->_drain_rbuf if $cb && !$self->{_in_drain};
688	}	836	}
689		837
690	=item $handle->rbuf	838	=item $handle->rbuf
691		839
692	Returns the read buffer (as a modifiable lvalue).	840	Returns the read buffer (as a modifiable lvalue).
693		841
694	You can access the read buffer directly as the C<< ->{rbuf} >> member, if	842	You can access the read buffer directly as the C<< ->{rbuf} >>
695	you want.	843	member, if you want. However, the only operation allowed on the
		844	read buffer (apart from looking at it) is removing data from its
		845	beginning. Otherwise modifying or appending to it is not allowed and will
		846	lead to hard-to-track-down bugs.
696		847
697	NOTE: The read buffer should only be used or modified if the C<on_read>,	848	NOTE: The read buffer should only be used or modified if the C<on_read>,
698	C<push_read> or C<unshift_read> methods are used. The other read methods	849	C<push_read> or C<unshift_read> methods are used. The other read methods
699	automatically manage the read buffer.	850	automatically manage the read buffer.
700		851
…		…
741	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read")	892	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read")
742	->($self, $cb, @_);	893	->($self, $cb, @_);
743	}	894	}
744		895
745	push @{ $self->{_queue} }, $cb;	896	push @{ $self->{_queue} }, $cb;
746	$self->_drain_rbuf;	897	$self->_drain_rbuf unless $self->{_in_drain};
747	}	898	}
748		899
749	sub unshift_read {	900	sub unshift_read {
750	my $self = shift;	901	my $self = shift;
751	my $cb = pop;	902	my $cb = pop;
…		…
757	->($self, $cb, @_);	908	->($self, $cb, @_);
758	}	909	}
759		910
760		911
761	unshift @{ $self->{_queue} }, $cb;	912	unshift @{ $self->{_queue} }, $cb;
762	$self->_drain_rbuf;	913	$self->_drain_rbuf unless $self->{_in_drain};
763	}	914	}
764		915
765	=item $handle->push_read (type => @args, $cb)	916	=item $handle->push_read (type => @args, $cb)
766		917
767	=item $handle->unshift_read (type => @args, $cb)	918	=item $handle->unshift_read (type => @args, $cb)
…		…
797	$cb->($_[0], substr $_[0]{rbuf}, 0, $len, "");	948	$cb->($_[0], substr $_[0]{rbuf}, 0, $len, "");
798	1	949	1
799	}	950	}
800	};	951	};
801		952
802	# compatibility with older API
803	sub push_read_chunk {
804	$_[0]->push_read (chunk => $_[1], $_[2]);
805	}
806
807	sub unshift_read_chunk {
808	$_[0]->unshift_read (chunk => $_[1], $_[2]);
809	}
810
811	=item line => [$eol, ]$cb->($handle, $line, $eol)	953	=item line => [$eol, ]$cb->($handle, $line, $eol)
812		954
813	The callback will be called only once a full line (including the end of	955	The callback will be called only once a full line (including the end of
814	line marker, C<$eol>) has been read. This line (excluding the end of line	956	line marker, C<$eol>) has been read. This line (excluding the end of line
815	marker) will be passed to the callback as second argument (C<$line>), and	957	marker) will be passed to the callback as second argument (C<$line>), and
…		…
830	=cut	972	=cut
831		973
832	register_read_type line => sub {	974	register_read_type line => sub {
833	my ($self, $cb, $eol) = @_;	975	my ($self, $cb, $eol) = @_;
834		976
835	$eol = qr|(\015?\012)| if @_ < 3;	977	if (@_ < 3) {
836	$eol = quotemeta $eol unless ref $eol;	978	# this is more than twice as fast as the generic code below
837	$eol = qr|^(.*?)($eol)|s;
838
839	sub {	979	sub {
840	$_[0]{rbuf} =~ s/$eol// or return;	980	$_[0]{rbuf} =~ s/^([^\015\012]*)(\015?\012)// or return;
841		981
842	$cb->($_[0], $1, $2);	982	$cb->($_[0], $1, $2);
843	1
844	}
845	};
846
847	# compatibility with older API
848	sub push_read_line {
849	my $self = shift;
850	$self->push_read (line => @_);
851	}
852
853	sub unshift_read_line {
854	my $self = shift;
855	$self->unshift_read (line => @_);
856	}
857
858	=item netstring => $cb->($handle, $string)
859
860	A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement).
861
862	Throws an error with C<$!> set to EBADMSG on format violations.
863
864	=cut
865
866	register_read_type netstring => sub {
867	my ($self, $cb) = @_;
868
869	sub {
870	unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) {
871	if ($_[0]{rbuf} =~ /[^0-9]/) {
872	$! = &Errno::EBADMSG;
873	$self->error;
874	}	983	1
875	return;
876	}	984	}
		985	} else {
		986	$eol = quotemeta $eol unless ref $eol;
		987	$eol = qr|^(.*?)($eol)|s;
877		988
878	my $len = $1;	989	sub {
		990	$_[0]{rbuf} =~ s/$eol// or return;
879		991
880	$self->unshift_read (chunk => $len, sub {	992	$cb->($_[0], $1, $2);
881	my $string = $_[1];
882	$_[0]->unshift_read (chunk => 1, sub {
883	if ($_[1] eq ",") {
884	$cb->($_[0], $string);
885	} else {
886	$! = &Errno::EBADMSG;
887	$self->error;
888	}
889	});	993	1
890	});	994	}
891
892	1
893	}	995	}
894	};	996	};
895		997
896	=item regex => $accept[, $reject[, $skip], $cb->($handle, $data)	998	=item regex => $accept[, $reject[, $skip], $cb->($handle, $data)
897		999
…		…
949	return 1;	1051	return 1;
950	}	1052	}
951		1053
952	# reject	1054	# reject
953	if ($reject && $$rbuf =~ $reject) {	1055	if ($reject && $$rbuf =~ $reject) {
954	$! = &Errno::EBADMSG;	1056	$self->_error (&Errno::EBADMSG);
955	$self->error;
956	}	1057	}
957		1058
958	# skip	1059	# skip
959	if ($skip && $$rbuf =~ $skip) {	1060	if ($skip && $$rbuf =~ $skip) {
960	$data .= substr $$rbuf, 0, $+[0], "";	1061	$data .= substr $$rbuf, 0, $+[0], "";
…		…
962		1063
963	()	1064	()
964	}	1065	}
965	};	1066	};
966		1067
		1068	=item netstring => $cb->($handle, $string)
		1069
		1070	A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement).
		1071
		1072	Throws an error with C<$!> set to EBADMSG on format violations.
		1073
		1074	=cut
		1075
		1076	register_read_type netstring => sub {
		1077	my ($self, $cb) = @_;
		1078
		1079	sub {
		1080	unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) {
		1081	if ($_[0]{rbuf} =~ /[^0-9]/) {
		1082	$self->_error (&Errno::EBADMSG);
		1083	}
		1084	return;
		1085	}
		1086
		1087	my $len = $1;
		1088
		1089	$self->unshift_read (chunk => $len, sub {
		1090	my $string = $_[1];
		1091	$_[0]->unshift_read (chunk => 1, sub {
		1092	if ($_[1] eq ",") {
		1093	$cb->($_[0], $string);
		1094	} else {
		1095	$self->_error (&Errno::EBADMSG);
		1096	}
		1097	});
		1098	});
		1099
		1100	1
		1101	}
		1102	};
		1103
		1104	=item packstring => $format, $cb->($handle, $string)
		1105
		1106	An octet string prefixed with an encoded length. The encoding C<$format>
		1107	uses the same format as a Perl C<pack> format, but must specify a single
		1108	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an
		1109	optional C<!>, C<< < >> or C<< > >> modifier).
		1110
		1111	For example, DNS over TCP uses a prefix of C<n> (2 octet network order),
		1112	EPP uses a prefix of C<N> (4 octtes).
		1113
		1114	Example: read a block of data prefixed by its length in BER-encoded
		1115	format (very efficient).
		1116
		1117	$handle->push_read (packstring => "w", sub {
		1118	my ($handle, $data) = @_;
		1119	});
		1120
		1121	=cut
		1122
		1123	register_read_type packstring => sub {
		1124	my ($self, $cb, $format) = @_;
		1125
		1126	sub {
		1127	# when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method
		1128	defined (my $len = eval { unpack $format, $_[0]{rbuf} })
		1129	or return;
		1130
		1131	$format = length pack $format, $len;
		1132
		1133	# bypass unshift if we already have the remaining chunk
		1134	if ($format + $len <= length $_[0]{rbuf}) {
		1135	my $data = substr $_[0]{rbuf}, $format, $len;
		1136	substr $_[0]{rbuf}, 0, $format + $len, "";
		1137	$cb->($_[0], $data);
		1138	} else {
		1139	# remove prefix
		1140	substr $_[0]{rbuf}, 0, $format, "";
		1141
		1142	# read remaining chunk
		1143	$_[0]->unshift_read (chunk => $len, $cb);
		1144	}
		1145
		1146	1
		1147	}
		1148	};
		1149
967	=item json => $cb->($handle, $hash_or_arrayref)	1150	=item json => $cb->($handle, $hash_or_arrayref)
968		1151
969	Reads a JSON object or array, decodes it and passes it to the callback.	1152	Reads a JSON object or array, decodes it and passes it to the
		1153	callback. When a parse error occurs, an C<EBADMSG> error will be raised.
970		1154
971	If a C<json> object was passed to the constructor, then that will be used	1155	If a C<json> object was passed to the constructor, then that will be used
972	for the final decode, otherwise it will create a JSON coder expecting UTF-8.	1156	for the final decode, otherwise it will create a JSON coder expecting UTF-8.
973		1157
974	This read type uses the incremental parser available with JSON version	1158	This read type uses the incremental parser available with JSON version
…		…
981	the C<json> write type description, above, for an actual example.	1165	the C<json> write type description, above, for an actual example.
982		1166
983	=cut	1167	=cut
984		1168
985	register_read_type json => sub {	1169	register_read_type json => sub {
986	my ($self, $cb, $accept, $reject, $skip) = @_;	1170	my ($self, $cb) = @_;
987		1171
988	require JSON;	1172	require JSON;
989		1173
990	my $data;	1174	my $data;
991	my $rbuf = \$self->{rbuf};	1175	my $rbuf = \$self->{rbuf};
992		1176
993	my $json = $self->{json} ||= JSON->new->utf8;	1177	my $json = $self->{json} ||= JSON->new->utf8;
994		1178
995	sub {	1179	sub {
996	my $ref = $json->incr_parse ($self->{rbuf});	1180	my $ref = eval { $json->incr_parse ($self->{rbuf}) };
997		1181
998	if ($ref) {	1182	if ($ref) {
999	$self->{rbuf} = $json->incr_text;	1183	$self->{rbuf} = $json->incr_text;
1000	$json->incr_text = "";	1184	$json->incr_text = "";
1001	$cb->($self, $ref);	1185	$cb->($self, $ref);
1002		1186
1003	1	1187	1
		1188	} elsif ($@) {
		1189	# error case
		1190	$json->incr_skip;
		1191
		1192	$self->{rbuf} = $json->incr_text;
		1193	$json->incr_text = "";
		1194
		1195	$self->_error (&Errno::EBADMSG);
		1196
		1197	()
1004	} else {	1198	} else {
1005	$self->{rbuf} = "";	1199	$self->{rbuf} = "";
		1200
1006	()	1201	()
1007	}	1202	}
		1203	}
		1204	};
		1205
		1206	=item storable => $cb->($handle, $ref)
		1207
		1208	Deserialises a L<Storable> frozen representation as written by the
		1209	C<storable> write type (BER-encoded length prefix followed by nfreeze'd
		1210	data).
		1211
		1212	Raises C<EBADMSG> error if the data could not be decoded.
		1213
		1214	=cut
		1215
		1216	register_read_type storable => sub {
		1217	my ($self, $cb) = @_;
		1218
		1219	require Storable;
		1220
		1221	sub {
		1222	# when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method
		1223	defined (my $len = eval { unpack "w", $_[0]{rbuf} })
		1224	or return;
		1225
		1226	my $format = length pack "w", $len;
		1227
		1228	# bypass unshift if we already have the remaining chunk
		1229	if ($format + $len <= length $_[0]{rbuf}) {
		1230	my $data = substr $_[0]{rbuf}, $format, $len;
		1231	substr $_[0]{rbuf}, 0, $format + $len, "";
		1232	$cb->($_[0], Storable::thaw ($data));
		1233	} else {
		1234	# remove prefix
		1235	substr $_[0]{rbuf}, 0, $format, "";
		1236
		1237	# read remaining chunk
		1238	$_[0]->unshift_read (chunk => $len, sub {
		1239	if (my $ref = eval { Storable::thaw ($_[1]) }) {
		1240	$cb->($_[0], $ref);
		1241	} else {
		1242	$self->_error (&Errno::EBADMSG);
		1243	}
		1244	});
		1245	}
		1246
		1247	1
1008	}	1248	}
1009	};	1249	};
1010		1250
1011	=back	1251	=back
1012		1252
…		…
1033	=item $handle->stop_read	1273	=item $handle->stop_read
1034		1274
1035	=item $handle->start_read	1275	=item $handle->start_read
1036		1276
1037	In rare cases you actually do not want to read anything from the	1277	In rare cases you actually do not want to read anything from the
1038	socket. In this case you can call C<stop_read>. Neither C<on_read> no	1278	socket. In this case you can call C<stop_read>. Neither C<on_read> nor
1039	any queued callbacks will be executed then. To start reading again, call	1279	any queued callbacks will be executed then. To start reading again, call
1040	C<start_read>.	1280	C<start_read>.
1041		1281
		1282	Note that AnyEvent::Handle will automatically C<start_read> for you when
		1283	you change the C<on_read> callback or push/unshift a read callback, and it
		1284	will automatically C<stop_read> for you when neither C<on_read> is set nor
		1285	there are any read requests in the queue.
		1286
		1287	These methods will have no effect when in TLS mode (as TLS doesn't support
		1288	half-duplex connections).
		1289
1042	=cut	1290	=cut
1043		1291
1044	sub stop_read {	1292	sub stop_read {
1045	my ($self) = @_;	1293	my ($self) = @_;
1046		1294
1047	delete $self->{_rw};	1295	delete $self->{_rw} unless $self->{tls};
1048	}	1296	}
1049		1297
1050	sub start_read {	1298	sub start_read {
1051	my ($self) = @_;	1299	my ($self) = @_;
1052		1300
1053	unless ($self->{_rw} || $self->{_eof}) {	1301	unless ($self->{_rw} || $self->{_eof}) {
1054	Scalar::Util::weaken $self;	1302	Scalar::Util::weaken $self;
1055		1303
1056	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {	1304	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {
1057	my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf};	1305	my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});
1058	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf;	1306	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf;
1059		1307
1060	if ($len > 0) {	1308	if ($len > 0) {
1061	$self->{_activity} = time;	1309	$self->{_activity} = AnyEvent->now;
1062		1310
1063	$self->{filter_r}	1311	if ($self->{tls}) {
1064	? $self->{filter_r}->($self, $rbuf)	1312	Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);
1065	: $self->_drain_rbuf;	1313
		1314	&_dotls ($self);
		1315	} else {
		1316	$self->_drain_rbuf unless $self->{_in_drain};
		1317	}
1066		1318
1067	} elsif (defined $len) {	1319	} elsif (defined $len) {
1068	delete $self->{_rw};	1320	delete $self->{_rw};
1069	delete $self->{_ww};
1070	delete $self->{_tw};
1071	$self->{_eof} = 1;	1321	$self->{_eof} = 1;
1072	$self->_drain_rbuf;	1322	$self->_drain_rbuf unless $self->{_in_drain};
1073		1323
1074	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	1324	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
1075	return $self->error;	1325	return $self->_error ($!, 1);
1076	}	1326	}
1077	});	1327	});
1078	}	1328	}
1079	}	1329	}
1080		1330
		1331	# poll the write BIO and send the data if applicable
1081	sub _dotls {	1332	sub _dotls {
1082	my ($self) = @_;	1333	my ($self) = @_;
1083		1334
		1335	my $tmp;
		1336
1084	if (length $self->{_tls_wbuf}) {	1337	if (length $self->{_tls_wbuf}) {
1085	while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {	1338	while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {
1086	substr $self->{_tls_wbuf}, 0, $len, "";	1339	substr $self->{_tls_wbuf}, 0, $tmp, "";
1087	}	1340	}
1088	}	1341	}
1089		1342
		1343	while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) {
		1344	unless (length $tmp) {
		1345	# let's treat SSL-eof as we treat normal EOF
		1346	delete $self->{_rw};
		1347	$self->{_eof} = 1;
		1348	&_freetls;
		1349	}
		1350
		1351	$self->{_tls_rbuf} .= $tmp;
		1352	$self->_drain_rbuf unless $self->{_in_drain};
		1353	$self->{tls} or return; # tls session might have gone away in callback
		1354	}
		1355
		1356	$tmp = Net::SSLeay::get_error ($self->{tls}, -1);
		1357
		1358	if ($tmp != Net::SSLeay::ERROR_WANT_READ ()) {
		1359	if ($tmp == Net::SSLeay::ERROR_SYSCALL ()) {
		1360	return $self->_error ($!, 1);
		1361	} elsif ($tmp == Net::SSLeay::ERROR_SSL ()) {
		1362	return $self->_error (&Errno::EIO, 1);
		1363	}
		1364
		1365	# all other errors are fine for our purposes
		1366	}
		1367
1090	if (defined (my $buf = Net::SSLeay::BIO_read ($self->{_wbio}))) {	1368	while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) {
1091	$self->{wbuf} .= $buf;	1369	$self->{wbuf} .= $tmp;
1092	$self->_drain_wbuf;	1370	$self->_drain_wbuf;
1093	}
1094
1095	while (defined (my $buf = Net::SSLeay::read ($self->{tls}))) {
1096	$self->{rbuf} .= $buf;
1097	$self->_drain_rbuf;
1098	}
1099
1100	my $err = Net::SSLeay::get_error ($self->{tls}, -1);
1101
1102	if ($err!= Net::SSLeay::ERROR_WANT_READ ()) {
1103	if ($err == Net::SSLeay::ERROR_SYSCALL ()) {
1104	$self->error;
1105	} elsif ($err == Net::SSLeay::ERROR_SSL ()) {
1106	$! = &Errno::EIO;
1107	$self->error;
1108	}
1109
1110	# all others are fine for our purposes
1111	}	1371	}
1112	}	1372	}
1113		1373
1114	=item $handle->starttls ($tls[, $tls_ctx])	1374	=item $handle->starttls ($tls[, $tls_ctx])
1115		1375
…		…
1125		1385
1126	The TLS connection object will end up in C<< $handle->{tls} >> after this	1386	The TLS connection object will end up in C<< $handle->{tls} >> after this
1127	call and can be used or changed to your liking. Note that the handshake	1387	call and can be used or changed to your liking. Note that the handshake
1128	might have already started when this function returns.	1388	might have already started when this function returns.
1129		1389
1130	=cut	1390	If it an error to start a TLS handshake more than once per
		1391	AnyEvent::Handle object (this is due to bugs in OpenSSL).
1131		1392
1132	# TODO: maybe document...	1393	=cut
		1394
1133	sub starttls {	1395	sub starttls {
1134	my ($self, $ssl, $ctx) = @_;	1396	my ($self, $ssl, $ctx) = @_;
1135		1397
1136	$self->stoptls;	1398	require Net::SSLeay;
1137		1399
		1400	Carp::croak "it is an error to call starttls more than once on an AnyEvent::Handle object"
		1401	if $self->{tls};
		1402
1138	if ($ssl eq "accept") {	1403	if ($ssl eq "accept") {
1139	$ssl = Net::SSLeay::new ($ctx || TLS_CTX ());	1404	$ssl = Net::SSLeay::new ($ctx || TLS_CTX ());
1140	Net::SSLeay::set_accept_state ($ssl);	1405	Net::SSLeay::set_accept_state ($ssl);
1141	} elsif ($ssl eq "connect") {	1406	} elsif ($ssl eq "connect") {
1142	$ssl = Net::SSLeay::new ($ctx || TLS_CTX ());	1407	$ssl = Net::SSLeay::new ($ctx || TLS_CTX ());
…		…
1148	# basically, this is deep magic (because SSL_read should have the same issues)	1413	# basically, this is deep magic (because SSL_read should have the same issues)
1149	# but the openssl maintainers basically said: "trust us, it just works".	1414	# but the openssl maintainers basically said: "trust us, it just works".
1150	# (unfortunately, we have to hardcode constants because the abysmally misdesigned	1415	# (unfortunately, we have to hardcode constants because the abysmally misdesigned
1151	# and mismaintained ssleay-module doesn't even offer them).	1416	# and mismaintained ssleay-module doesn't even offer them).
1152	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html	1417	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html
		1418	#
		1419	# in short: this is a mess.
		1420	#
		1421	# note that we do not try to keep the length constant between writes as we are required to do.
		1422	# we assume that most (but not all) of this insanity only applies to non-blocking cases,
		1423	# and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to
		1424	# have identity issues in that area.
1153	Net::SSLeay::CTX_set_mode ($self->{tls},	1425	Net::SSLeay::CTX_set_mode ($self->{tls},
1154	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1)	1426	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1)
1155	| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2));	1427	| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2));
1156		1428
1157	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1429	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1158	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1430	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1159		1431
1160	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});	1432	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});
1161		1433
1162	$self->{filter_w} = sub {	1434	&_dotls; # need to trigger the initial handshake
1163	$_[0]{_tls_wbuf} .= ${$_[1]};	1435	$self->start_read; # make sure we actually do read
1164	&_dotls;
1165	};
1166	$self->{filter_r} = sub {
1167	Net::SSLeay::BIO_write ($_[0]{_rbio}, ${$_[1]});
1168	&_dotls;
1169	};
1170	}	1436	}
1171		1437
1172	=item $handle->stoptls	1438	=item $handle->stoptls
1173		1439
1174	Destroys the SSL connection, if any. Partial read or write data will be	1440	Shuts down the SSL connection - this makes a proper EOF handshake by
1175	lost.	1441	sending a close notify to the other side, but since OpenSSL doesn't
		1442	support non-blocking shut downs, it is not possible to re-use the stream
		1443	afterwards.
1176		1444
1177	=cut	1445	=cut
1178		1446
1179	sub stoptls {	1447	sub stoptls {
1180	my ($self) = @_;	1448	my ($self) = @_;
1181		1449
		1450	if ($self->{tls}) {
		1451	Net::SSLeay::shutdown ($self->{tls});
		1452
		1453	&_dotls;
		1454
		1455	# we don't give a shit. no, we do, but we can't. no...
		1456	# we, we... have to use openssl :/
		1457	&_freetls;
		1458	}
		1459	}
		1460
		1461	sub _freetls {
		1462	my ($self) = @_;
		1463
		1464	return unless $self->{tls};
		1465
1182	Net::SSLeay::free (delete $self->{tls}) if $self->{tls};	1466	Net::SSLeay::free (delete $self->{tls});
1183		1467
1184	delete $self->{_rbio};	1468	delete @$self{qw(_rbio _wbio _tls_wbuf)};
1185	delete $self->{_wbio};
1186	delete $self->{_tls_wbuf};
1187	delete $self->{filter_r};
1188	delete $self->{filter_w};
1189	}	1469	}
1190		1470
1191	sub DESTROY {	1471	sub DESTROY {
1192	my $self = shift;	1472	my ($self) = @_;
1193		1473
1194	$self->stoptls;	1474	&_freetls;
		1475
		1476	my $linger = exists $self->{linger} ? $self->{linger} : 3600;
		1477
		1478	if ($linger && length $self->{wbuf}) {
		1479	my $fh = delete $self->{fh};
		1480	my $wbuf = delete $self->{wbuf};
		1481
		1482	my @linger;
		1483
		1484	push @linger, AnyEvent->io (fh => $fh, poll => "w", cb => sub {
		1485	my $len = syswrite $fh, $wbuf, length $wbuf;
		1486
		1487	if ($len > 0) {
		1488	substr $wbuf, 0, $len, "";
		1489	} else {
		1490	@linger = (); # end
		1491	}
		1492	});
		1493	push @linger, AnyEvent->timer (after => $linger, cb => sub {
		1494	@linger = ();
		1495	});
		1496	}
		1497	}
		1498
		1499	=item $handle->destroy
		1500
		1501	Shuts down the handle object as much as possible - this call ensures that
		1502	no further callbacks will be invoked and resources will be freed as much
		1503	as possible. You must not call any methods on the object afterwards.
		1504
		1505	Normally, you can just "forget" any references to an AnyEvent::Handle
		1506	object and it will simply shut down. This works in fatal error and EOF
		1507	callbacks, as well as code outside. It does I<NOT> work in a read or write
		1508	callback, so when you want to destroy the AnyEvent::Handle object from
		1509	within such an callback. You I<MUST> call C<< ->destroy >> explicitly in
		1510	that case.
		1511
		1512	The handle might still linger in the background and write out remaining
		1513	data, as specified by the C<linger> option, however.
		1514
		1515	=cut
		1516
		1517	sub destroy {
		1518	my ($self) = @_;
		1519
		1520	$self->DESTROY;
		1521	%$self = ();
1195	}	1522	}
1196		1523
1197	=item AnyEvent::Handle::TLS_CTX	1524	=item AnyEvent::Handle::TLS_CTX
1198		1525
1199	This function creates and returns the Net::SSLeay::CTX object used by	1526	This function creates and returns the Net::SSLeay::CTX object used by
…		…
1229	}	1556	}
1230	}	1557	}
1231		1558
1232	=back	1559	=back
1233		1560
		1561
		1562	=head1 NONFREQUENTLY ASKED QUESTIONS
		1563
		1564	=over 4
		1565
		1566	=item I C<undef> the AnyEvent::Handle reference inside my callback and
		1567	still get further invocations!
		1568
		1569	That's because AnyEvent::Handle keeps a reference to itself when handling
		1570	read or write callbacks.
		1571
		1572	It is only safe to "forget" the reference inside EOF or error callbacks,
		1573	from within all other callbacks, you need to explicitly call the C<<
		1574	->destroy >> method.
		1575
		1576	=item I get different callback invocations in TLS mode/Why can't I pause
		1577	reading?
		1578
		1579	Unlike, say, TCP, TLS connections do not consist of two independent
		1580	communication channels, one for each direction. Or put differently. The
		1581	read and write directions are not independent of each other: you cannot
		1582	write data unless you are also prepared to read, and vice versa.
		1583
		1584	This can mean than, in TLS mode, you might get C<on_error> or C<on_eof>
		1585	callback invocations when you are not expecting any read data - the reason
		1586	is that AnyEvent::Handle always reads in TLS mode.
		1587
		1588	During the connection, you have to make sure that you always have a
		1589	non-empty read-queue, or an C<on_read> watcher. At the end of the
		1590	connection (or when you no longer want to use it) you can call the
		1591	C<destroy> method.
		1592
		1593	=item How do I read data until the other side closes the connection?
		1594
		1595	If you just want to read your data into a perl scalar, the easiest way
		1596	to achieve this is by setting an C<on_read> callback that does nothing,
		1597	clearing the C<on_eof> callback and in the C<on_error> callback, the data
		1598	will be in C<$_[0]{rbuf}>:
		1599
		1600	$handle->on_read (sub { });
		1601	$handle->on_eof (undef);
		1602	$handle->on_error (sub {
		1603	my $data = delete $_[0]{rbuf};
		1604	undef $handle;
		1605	});
		1606
		1607	The reason to use C<on_error> is that TCP connections, due to latencies
		1608	and packets loss, might get closed quite violently with an error, when in
		1609	fact, all data has been received.
		1610
		1611	It is usually better to use acknowledgements when transferring data,
		1612	to make sure the other side hasn't just died and you got the data
		1613	intact. This is also one reason why so many internet protocols have an
		1614	explicit QUIT command.
		1615
		1616	=item I don't want to destroy the handle too early - how do I wait until
		1617	all data has been written?
		1618
		1619	After writing your last bits of data, set the C<on_drain> callback
		1620	and destroy the handle in there - with the default setting of
		1621	C<low_water_mark> this will be called precisely when all data has been
		1622	written to the socket:
		1623
		1624	$handle->push_write (...);
		1625	$handle->on_drain (sub {
		1626	warn "all data submitted to the kernel\n";
		1627	undef $handle;
		1628	});
		1629
		1630	=back
		1631
		1632
1234	=head1 SUBCLASSING AnyEvent::Handle	1633	=head1 SUBCLASSING AnyEvent::Handle
1235		1634
1236	In many cases, you might want to subclass AnyEvent::Handle.	1635	In many cases, you might want to subclass AnyEvent::Handle.
1237		1636
1238	To make this easier, a given version of AnyEvent::Handle uses these	1637	To make this easier, a given version of AnyEvent::Handle uses these
…		…
1241	=over 4	1640	=over 4
1242		1641
1243	=item * all constructor arguments become object members.	1642	=item * all constructor arguments become object members.
1244		1643
1245	At least initially, when you pass a C<tls>-argument to the constructor it	1644	At least initially, when you pass a C<tls>-argument to the constructor it
1246	will end up in C<< $handle->{tls} >>. Those members might be changes or	1645	will end up in C<< $handle->{tls} >>. Those members might be changed or
1247	mutated later on (for example C<tls> will hold the TLS connection object).	1646	mutated later on (for example C<tls> will hold the TLS connection object).
1248		1647
1249	=item * other object member names are prefixed with an C<_>.	1648	=item * other object member names are prefixed with an C<_>.
1250		1649
1251	All object members not explicitly documented (internal use) are prefixed	1650	All object members not explicitly documented (internal use) are prefixed

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