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Revision 1.27 by root, Sat May 24 15:26:04 2008 UTC vs.
Revision 1.85 by root, Thu Aug 21 19:53:19 2008 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 ();	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		12
13	=head1 NAME	13	=head1 NAME
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	This module is experimental.
18
19	=cut	17	=cut
20		18
21	our $VERSION = '0.04';	19	our $VERSION = 4.232;
22		20
23	=head1 SYNOPSIS	21	=head1 SYNOPSIS
24		22
25	use AnyEvent;	23	use AnyEvent;
26	use AnyEvent::Handle;	24	use AnyEvent::Handle;
27		25
28	my $cv = AnyEvent->condvar;	26	my $cv = AnyEvent->condvar;
29		27
30	my $ae_fh = AnyEvent::Handle->new (fh => \*STDIN);	28	my $handle =
31
32	#TODO
33
34	# or use the constructor to pass the callback:
35
36	my $ae_fh2 =
37	AnyEvent::Handle->new (	29	AnyEvent::Handle->new (
38	fh => \*STDIN,	30	fh => \*STDIN,
39	on_eof => sub {	31	on_eof => sub {
40	$cv->broadcast;	32	$cv->broadcast;
41	},	33	},
42	#TODO
43	);	34	);
44		35
45	$cv->wait;	36	# send some request line
		37	$handle->push_write ("getinfo\015\012");
		38
		39	# read the response line
		40	$handle->push_read (line => sub {
		41	my ($handle, $line) = @_;
		42	warn "read line <$line>\n";
		43	$cv->send;
		44	});
		45
		46	$cv->recv;
46		47
47	=head1 DESCRIPTION	48	=head1 DESCRIPTION
48		49
49	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
50	filehandles. For utility functions for doing non-blocking connects and accepts	51	filehandles. For utility functions for doing non-blocking connects and accepts
51	on sockets see L<AnyEvent::Util>.	52	on sockets see L<AnyEvent::Util>.
52		53
		54	The L<AnyEvent::Intro> tutorial contains some well-documented
		55	AnyEvent::Handle examples.
		56
53	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
54	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
55	treatment of characters applies to this module as well.	59	treatment of characters applies to this module as well.
56		60
57	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
…		…
69		73
70	=item fh => $filehandle [MANDATORY]	74	=item fh => $filehandle [MANDATORY]
71		75
72	The filehandle this L<AnyEvent::Handle> object will operate on.	76	The filehandle this L<AnyEvent::Handle> object will operate on.
73		77
74	NOTE: The filehandle will be set to non-blocking (using	78	NOTE: The filehandle will be set to non-blocking mode (using
75	AnyEvent::Util::fh_nonblocking).	79	C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in
		80	that mode.
76		81
77	=item on_eof => $cb->($self)	82	=item on_eof => $cb->($handle)
78		83
79	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.
80		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
81	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,
82	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
83	waiting for data.	95	waiting for data.
84		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
85	=item on_error => $cb->($self)	100	=item on_error => $cb->($handle, $fatal)
86		101
87	This is the fatal error callback, that is called when, well, a fatal error	102	This is the error callback, which is called when, well, some error
88	occurs, such as not being able to resolve the hostname, failure to connect	103	occured, such as not being able to resolve the hostname, failure to
89	or a read error.	104	connect or a read error.
90		105
91	The object will not be in a usable state when this callback has been	106	Some errors are fatal (which is indicated by C<$fatal> being true). On
92	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>).
93		116
94	On callback entrance, the value of C<$!> contains the operating system	117	On callback entrance, the value of C<$!> contains the operating system
95	error (or C<ENOSPC> or C<EPIPE>).	118	error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>).
96		119
97	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
98	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
99	die.	122	C<croak>.
100		123
101	=item on_read => $cb->($self)	124	=item on_read => $cb->($handle)
102		125
103	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
104	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).
105		130
106	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 >>
107	method or access the C<$self->{rbuf}> member directly.	132	method or access the C<$handle->{rbuf}> member directly.
108		133
109	When an EOF condition is detected then AnyEvent::Handle will first try to	134	When an EOF condition is detected then AnyEvent::Handle will first try to
110	feed all the remaining data to the queued callbacks and C<on_read> before	135	feed all the remaining data to the queued callbacks and C<on_read> before
111	calling the C<on_eof> callback. If no progress can be made, then a fatal	136	calling the C<on_eof> callback. If no progress can be made, then a fatal
112	error will be raised (with C<$!> set to C<EPIPE>).	137	error will be raised (with C<$!> set to C<EPIPE>).
113		138
114	=item on_drain => $cb->()	139	=item on_drain => $cb->($handle)
115		140
116	This sets the callback that is called when the write buffer becomes empty	141	This sets the callback that is called when the write buffer becomes empty
117	(or when the callback is set and the buffer is empty already).	142	(or when the callback is set and the buffer is empty already).
118		143
119	To append to the write buffer, use the C<< ->push_write >> method.	144	To append to the write buffer, use the C<< ->push_write >> method.
		145
		146	This callback is useful when you don't want to put all of your write data
		147	into the queue at once, for example, when you want to write the contents
		148	of some file to the socket you might not want to read the whole file into
		149	memory and push it into the queue, but instead only read more data from
		150	the file when the write queue becomes empty.
		151
		152	=item timeout => $fractional_seconds
		153
		154	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
		156	handle, the C<on_timeout> callback will be invoked (and if that one is
		157	missing, an C<ETIMEDOUT> error will be raised).
		158
		159	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
		161	idle then you should disable the timout temporarily or ignore the timeout
		162	in the C<on_timeout> callback.
		163
		164	Zero (the default) disables this timeout.
		165
		166	=item on_timeout => $cb->($handle)
		167
		168	Called whenever the inactivity timeout passes. If you return from this
		169	callback, then the timeout will be reset as if some activity had happened,
		170	so this condition is not fatal in any way.
120		171
121	=item rbuf_max => <bytes>	172	=item rbuf_max => <bytes>
122		173
123	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)	174	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)
124	when the read buffer ever (strictly) exceeds this size. This is useful to	175	when the read buffer ever (strictly) exceeds this size. This is useful to
…		…
128	be configured to accept only so-and-so much data that it cannot act on	179	be configured to accept only so-and-so much data that it cannot act on
129	(for example, when expecting a line, an attacker could send an unlimited	180	(for example, when expecting a line, an attacker could send an unlimited
130	amount of data without a callback ever being called as long as the line	181	amount of data without a callback ever being called as long as the line
131	isn't finished).	182	isn't finished).
132		183
		184	=item autocork => <boolean>
		185
		186	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
		188	a write watcher and wait for the next event loop iteration, but can be
		189	inefficient if you write multiple small chunks (this disadvantage is
		190	usually avoided by your kernel's nagle algorithm, see C<low_delay>).
		191
		192	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,
		194	but less efficient when you do a single write only.
		195
		196	=item no_delay => <boolean>
		197
		198	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
		200	the Nagle algorithm, and usually it is beneficial.
		201
		202	In some situations you want as low a delay as possible, which cna be
		203	accomplishd by setting this option to true.
		204
		205	The default is your opertaing system's default behaviour, this option
		206	explicitly enables or disables it, if possible.
		207
133	=item read_size => <bytes>	208	=item read_size => <bytes>
134		209
135	The default read block size (the amount of bytes this module will try to read	210	The default read block size (the amount of bytes this module will try to read
136	on each [loop iteration). Default: C<4096>.	211	during each (loop iteration). Default: C<8192>.
137		212
138	=item low_water_mark => <bytes>	213	=item low_water_mark => <bytes>
139		214
140	Sets the amount of bytes (default: C<0>) that make up an "empty" write	215	Sets the amount of bytes (default: C<0>) that make up an "empty" write
141	buffer: If the write reaches this size or gets even samller it is	216	buffer: If the write reaches this size or gets even samller it is
142	considered empty.	217	considered empty.
143		218
		219	=item linger => <seconds>
		220
		221	If non-zero (default: C<3600>), then the destructor of the
		222	AnyEvent::Handle object will check wether there is still outstanding write
		223	data and will install a watcher that will write out this data. No errors
		224	will be reported (this mostly matches how the operating system treats
		225	outstanding data at socket close time).
		226
		227	This will not work for partial TLS data that could not yet been
		228	encoded. This data will be lost.
		229
144	=item tls => "accept" | "connect" | Net::SSLeay::SSL object	230	=item tls => "accept" | "connect" | Net::SSLeay::SSL object
145		231
146	When this parameter is given, it enables TLS (SSL) mode, that means it	232	When this parameter is given, it enables TLS (SSL) mode, that means
147	will start making tls handshake and will transparently encrypt/decrypt	233	AnyEvent will start a TLS handshake and will transparently encrypt/decrypt
148	data.	234	data.
149		235
150	TLS mode requires Net::SSLeay to be installed (it will be loaded	236	TLS mode requires Net::SSLeay to be installed (it will be loaded
151	automatically when you try to create a TLS handle).	237	automatically when you try to create a TLS handle).
152		238
153	For the TLS server side, use C<accept>, and for the TLS client side of a	239	Unlike TCP, TLS has a server and client side: for the TLS server side, use
154	connection, use C<connect> mode.	240	C<accept>, and for the TLS client side of a connection, use C<connect>
		241	mode.
155		242
156	You can also provide your own TLS connection object, but you have	243	You can also provide your own TLS connection object, but you have
157	to make sure that you call either C<Net::SSLeay::set_connect_state>	244	to make sure that you call either C<Net::SSLeay::set_connect_state>
158	or C<Net::SSLeay::set_accept_state> on it before you pass it to	245	or C<Net::SSLeay::set_accept_state> on it before you pass it to
159	AnyEvent::Handle.	246	AnyEvent::Handle.
160		247
161	See the C<starttls> method if you need to start TLs negotiation later.	248	See the C<starttls> method for when need to start TLS negotiation later.
162		249
163	=item tls_ctx => $ssl_ctx	250	=item tls_ctx => $ssl_ctx
164		251
165	Use the given Net::SSLeay::CTX object to create the new TLS connection	252	Use the given Net::SSLeay::CTX object to create the new TLS connection
166	(unless a connection object was specified directly). If this parameter is	253	(unless a connection object was specified directly). If this parameter is
167	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.	254	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.
168		255
		256	=item json => JSON or JSON::XS object
		257
		258	This is the json coder object used by the C<json> read and write types.
		259
		260	If you don't supply it, then AnyEvent::Handle will create and use a
		261	suitable one, which will write and expect UTF-8 encoded JSON texts.
		262
		263	Note that you are responsible to depend on the JSON module if you want to
		264	use this functionality, as AnyEvent does not have a dependency itself.
		265
		266	=item filter_r => $cb
		267
		268	=item filter_w => $cb
		269
		270	These exist, but are undocumented at this time.
		271
169	=back	272	=back
170		273
171	=cut	274	=cut
172		275
173	sub new {	276	sub new {
…		…
182	if ($self->{tls}) {	285	if ($self->{tls}) {
183	require Net::SSLeay;	286	require Net::SSLeay;
184	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx});	287	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx});
185	}	288	}
186		289
187	$self->on_eof (delete $self->{on_eof} ) if $self->{on_eof};	290	$self->{_activity} = AnyEvent->now;
188	$self->on_error (delete $self->{on_error}) if $self->{on_error};	291	$self->_timeout;
		292
189	$self->on_drain (delete $self->{on_drain}) if $self->{on_drain};	293	$self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain};
190	$self->on_read (delete $self->{on_read} ) if $self->{on_read};	294	$self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay};
191		295
192	$self->start_read;	296	$self->start_read
		297	if $self->{on_read};
193		298
194	$self	299	$self
195	}	300	}
196		301
197	sub _shutdown {	302	sub _shutdown {
198	my ($self) = @_;	303	my ($self) = @_;
199		304
		305	delete $self->{_tw};
200	delete $self->{rw};	306	delete $self->{_rw};
201	delete $self->{ww};	307	delete $self->{_ww};
202	delete $self->{fh};	308	delete $self->{fh};
203	}
204		309
		310	$self->stoptls;
		311
		312	delete $self->{on_read};
		313	delete $self->{_queue};
		314	}
		315
205	sub error {	316	sub _error {
206	my ($self) = @_;	317	my ($self, $errno, $fatal) = @_;
207		318
208	{
209	local $!;
210	$self->_shutdown;	319	$self->_shutdown
211	}	320	if $fatal;
		321
		322	$! = $errno;
212		323
213	if ($self->{on_error}) {	324	if ($self->{on_error}) {
214	$self->{on_error}($self);	325	$self->{on_error}($self, $fatal);
215	} else {	326	} else {
216	die "AnyEvent::Handle uncaught fatal error: $!";	327	Carp::croak "AnyEvent::Handle uncaught error: $!";
217	}	328	}
218	}	329	}
219		330
220	=item $fh = $handle->fh	331	=item $fh = $handle->fh
221		332
222	This method returns the file handle of the L<AnyEvent::Handle> object.	333	This method returns the file handle of the L<AnyEvent::Handle> object.
223		334
224	=cut	335	=cut
225		336
226	sub fh { $_[0]->{fh} }	337	sub fh { $_[0]{fh} }
227		338
228	=item $handle->on_error ($cb)	339	=item $handle->on_error ($cb)
229		340
230	Replace the current C<on_error> callback (see the C<on_error> constructor argument).	341	Replace the current C<on_error> callback (see the C<on_error> constructor argument).
231		342
…		…
241		352
242	=cut	353	=cut
243		354
244	sub on_eof {	355	sub on_eof {
245	$_[0]{on_eof} = $_[1];	356	$_[0]{on_eof} = $_[1];
		357	}
		358
		359	=item $handle->on_timeout ($cb)
		360
		361	Replace the current C<on_timeout> callback, or disables the callback
		362	(but not the timeout) if C<$cb> = C<undef>. See C<timeout> constructor
		363	argument.
		364
		365	=cut
		366
		367	sub on_timeout {
		368	$_[0]{on_timeout} = $_[1];
		369	}
		370
		371	=item $handle->autocork ($boolean)
		372
		373	Enables or disables the current autocork behaviour (see C<autocork>
		374	constructor argument).
		375
		376	=cut
		377
		378	=item $handle->no_delay ($boolean)
		379
		380	Enables or disables the C<no_delay> setting (see constructor argument of
		381	the same name for details).
		382
		383	=cut
		384
		385	sub no_delay {
		386	$_[0]{no_delay} = $_[1];
		387
		388	eval {
		389	local $SIG{__DIE__};
		390	setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1];
		391	};
		392	}
		393
		394	#############################################################################
		395
		396	=item $handle->timeout ($seconds)
		397
		398	Configures (or disables) the inactivity timeout.
		399
		400	=cut
		401
		402	sub timeout {
		403	my ($self, $timeout) = @_;
		404
		405	$self->{timeout} = $timeout;
		406	$self->_timeout;
		407	}
		408
		409	# reset the timeout watcher, as neccessary
		410	# also check for time-outs
		411	sub _timeout {
		412	my ($self) = @_;
		413
		414	if ($self->{timeout}) {
		415	my $NOW = AnyEvent->now;
		416
		417	# when would the timeout trigger?
		418	my $after = $self->{_activity} + $self->{timeout} - $NOW;
		419
		420	# now or in the past already?
		421	if ($after <= 0) {
		422	$self->{_activity} = $NOW;
		423
		424	if ($self->{on_timeout}) {
		425	$self->{on_timeout}($self);
		426	} else {
		427	$self->_error (&Errno::ETIMEDOUT);
		428	}
		429
		430	# callback could have changed timeout value, optimise
		431	return unless $self->{timeout};
		432
		433	# calculate new after
		434	$after = $self->{timeout};
		435	}
		436
		437	Scalar::Util::weaken $self;
		438	return unless $self; # ->error could have destroyed $self
		439
		440	$self->{_tw} ||= AnyEvent->timer (after => $after, cb => sub {
		441	delete $self->{_tw};
		442	$self->_timeout;
		443	});
		444	} else {
		445	delete $self->{_tw};
		446	}
246	}	447	}
247		448
248	#############################################################################	449	#############################################################################
249		450
250	=back	451	=back
…		…
287	=cut	488	=cut
288		489
289	sub _drain_wbuf {	490	sub _drain_wbuf {
290	my ($self) = @_;	491	my ($self) = @_;
291		492
292	unless ($self->{ww}) {	493	if (!$self->{_ww} && length $self->{wbuf}) {
		494
293	Scalar::Util::weaken $self;	495	Scalar::Util::weaken $self;
		496
294	my $cb = sub {	497	my $cb = sub {
295	my $len = syswrite $self->{fh}, $self->{wbuf};	498	my $len = syswrite $self->{fh}, $self->{wbuf};
296		499
297	if ($len > 0) {	500	if ($len >= 0) {
298	substr $self->{wbuf}, 0, $len, "";	501	substr $self->{wbuf}, 0, $len, "";
		502
		503	$self->{_activity} = AnyEvent->now;
299		504
300	$self->{on_drain}($self)	505	$self->{on_drain}($self)
301	if $self->{low_water_mark} >= length $self->{wbuf}	506	if $self->{low_water_mark} >= length $self->{wbuf}
302	&& $self->{on_drain};	507	&& $self->{on_drain};
303		508
304	delete $self->{ww} unless length $self->{wbuf};	509	delete $self->{_ww} unless length $self->{wbuf};
305	} elsif ($! != EAGAIN && $! != EINTR) {	510	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
306	$self->error;	511	$self->_error ($!, 1);
307	}	512	}
308	};	513	};
309		514
		515	# try to write data immediately
		516	$cb->() unless $self->{autocork};
		517
		518	# if still data left in wbuf, we need to poll
310	$self->{ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb);	519	$self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb)
311		520	if length $self->{wbuf};
312	$cb->($self);
313	};	521	};
		522	}
		523
		524	our %WH;
		525
		526	sub register_write_type($$) {
		527	$WH{$_[0]} = $_[1];
314	}	528	}
315		529
316	sub push_write {	530	sub push_write {
317	my $self = shift;	531	my $self = shift;
318		532
		533	if (@_ > 1) {
		534	my $type = shift;
		535
		536	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")
		537	->($self, @_);
		538	}
		539
319	if ($self->{filter_w}) {	540	if ($self->{filter_w}) {
320	$self->{filter_w}->($self, \$_[0]);	541	$self->{filter_w}($self, \$_[0]);
321	} else {	542	} else {
322	$self->{wbuf} .= $_[0];	543	$self->{wbuf} .= $_[0];
323	$self->_drain_wbuf;	544	$self->_drain_wbuf;
324	}	545	}
325	}	546	}
326		547
		548	=item $handle->push_write (type => @args)
		549
		550	Instead of formatting your data yourself, you can also let this module do
		551	the job by specifying a type and type-specific arguments.
		552
		553	Predefined types are (if you have ideas for additional types, feel free to
		554	drop by and tell us):
		555
		556	=over 4
		557
		558	=item netstring => $string
		559
		560	Formats the given value as netstring
		561	(http://cr.yp.to/proto/netstrings.txt, this is not a recommendation to use them).
		562
		563	=cut
		564
		565	register_write_type netstring => sub {
		566	my ($self, $string) = @_;
		567
		568	sprintf "%d:%s,", (length $string), $string
		569	};
		570
		571	=item packstring => $format, $data
		572
		573	An octet string prefixed with an encoded length. The encoding C<$format>
		574	uses the same format as a Perl C<pack> format, but must specify a single
		575	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an
		576	optional C<!>, C<< < >> or C<< > >> modifier).
		577
		578	=cut
		579
		580	register_write_type packstring => sub {
		581	my ($self, $format, $string) = @_;
		582
		583	pack "$format/a*", $string
		584	};
		585
		586	=item json => $array_or_hashref
		587
		588	Encodes the given hash or array reference into a JSON object. Unless you
		589	provide your own JSON object, this means it will be encoded to JSON text
		590	in UTF-8.
		591
		592	JSON objects (and arrays) are self-delimiting, so you can write JSON at
		593	one end of a handle and read them at the other end without using any
		594	additional framing.
		595
		596	The generated JSON text is guaranteed not to contain any newlines: While
		597	this module doesn't need delimiters after or between JSON texts to be
		598	able to read them, many other languages depend on that.
		599
		600	A simple RPC protocol that interoperates easily with others is to send
		601	JSON arrays (or objects, although arrays are usually the better choice as
		602	they mimic how function argument passing works) and a newline after each
		603	JSON text:
		604
		605	$handle->push_write (json => ["method", "arg1", "arg2"]); # whatever
		606	$handle->push_write ("\012");
		607
		608	An AnyEvent::Handle receiver would simply use the C<json> read type and
		609	rely on the fact that the newline will be skipped as leading whitespace:
		610
		611	$handle->push_read (json => sub { my $array = $_[1]; ... });
		612
		613	Other languages could read single lines terminated by a newline and pass
		614	this line into their JSON decoder of choice.
		615
		616	=cut
		617
		618	register_write_type json => sub {
		619	my ($self, $ref) = @_;
		620
		621	require JSON;
		622
		623	$self->{json} ? $self->{json}->encode ($ref)
		624	: JSON::encode_json ($ref)
		625	};
		626
		627	=item storable => $reference
		628
		629	Freezes the given reference using L<Storable> and writes it to the
		630	handle. Uses the C<nfreeze> format.
		631
		632	=cut
		633
		634	register_write_type storable => sub {
		635	my ($self, $ref) = @_;
		636
		637	require Storable;
		638
		639	pack "w/a*", Storable::nfreeze ($ref)
		640	};
		641
		642	=back
		643
		644	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)
		645
		646	This function (not method) lets you add your own types to C<push_write>.
		647	Whenever the given C<type> is used, C<push_write> will invoke the code
		648	reference with the handle object and the remaining arguments.
		649
		650	The code reference is supposed to return a single octet string that will
		651	be appended to the write buffer.
		652
		653	Note that this is a function, and all types registered this way will be
		654	global, so try to use unique names.
		655
		656	=cut
		657
327	#############################################################################	658	#############################################################################
328		659
329	=back	660	=back
330		661
331	=head2 READ QUEUE	662	=head2 READ QUEUE
…		…
337	ways, the "simple" way, using only C<on_read> and the "complex" way, using	668	ways, the "simple" way, using only C<on_read> and the "complex" way, using
338	a queue.	669	a queue.
339		670
340	In the simple case, you just install an C<on_read> callback and whenever	671	In the simple case, you just install an C<on_read> callback and whenever
341	new data arrives, it will be called. You can then remove some data (if	672	new data arrives, it will be called. You can then remove some data (if
342	enough is there) from the read buffer (C<< $handle->rbuf >>) if you want	673	enough is there) from the read buffer (C<< $handle->rbuf >>). Or you cna
343	or not.	674	leave the data there if you want to accumulate more (e.g. when only a
		675	partial message has been received so far).
344		676
345	In the more complex case, you want to queue multiple callbacks. In this	677	In the more complex case, you want to queue multiple callbacks. In this
346	case, AnyEvent::Handle will call the first queued callback each time new	678	case, AnyEvent::Handle will call the first queued callback each time new
347	data arrives and removes it when it has done its job (see C<push_read>,	679	data arrives (also the first time it is queued) and removes it when it has
348	below).	680	done its job (see C<push_read>, below).
349		681
350	This way you can, for example, push three line-reads, followed by reading	682	This way you can, for example, push three line-reads, followed by reading
351	a chunk of data, and AnyEvent::Handle will execute them in order.	683	a chunk of data, and AnyEvent::Handle will execute them in order.
352		684
353	Example 1: EPP protocol parser. EPP sends 4 byte length info, followed by	685	Example 1: EPP protocol parser. EPP sends 4 byte length info, followed by
354	the specified number of bytes which give an XML datagram.	686	the specified number of bytes which give an XML datagram.
355		687
356	# in the default state, expect some header bytes	688	# in the default state, expect some header bytes
357	$handle->on_read (sub {	689	$handle->on_read (sub {
358	# some data is here, now queue the length-header-read (4 octets)	690	# some data is here, now queue the length-header-read (4 octets)
359	shift->unshift_read_chunk (4, sub {	691	shift->unshift_read (chunk => 4, sub {
360	# header arrived, decode	692	# header arrived, decode
361	my $len = unpack "N", $_[1];	693	my $len = unpack "N", $_[1];
362		694
363	# now read the payload	695	# now read the payload
364	shift->unshift_read_chunk ($len, sub {	696	shift->unshift_read (chunk => $len, sub {
365	my $xml = $_[1];	697	my $xml = $_[1];
366	# handle xml	698	# handle xml
367	});	699	});
368	});	700	});
369	});	701	});
370		702
371	Example 2: Implement a client for a protocol that replies either with	703	Example 2: Implement a client for a protocol that replies either with "OK"
372	"OK" and another line or "ERROR" for one request, and 64 bytes for the	704	and another line or "ERROR" for the first request that is sent, and 64
373	second request. Due tot he availability of a full queue, we can just	705	bytes for the second request. Due to the availability of a queue, we can
374	pipeline sending both requests and manipulate the queue as necessary in	706	just pipeline sending both requests and manipulate the queue as necessary
375	the callbacks:	707	in the callbacks.
376		708
377	# request one	709	When the first callback is called and sees an "OK" response, it will
		710	C<unshift> another line-read. This line-read will be queued I<before> the
		711	64-byte chunk callback.
		712
		713	# request one, returns either "OK + extra line" or "ERROR"
378	$handle->push_write ("request 1\015\012");	714	$handle->push_write ("request 1\015\012");
379		715
380	# we expect "ERROR" or "OK" as response, so push a line read	716	# we expect "ERROR" or "OK" as response, so push a line read
381	$handle->push_read_line (sub {	717	$handle->push_read (line => sub {
382	# if we got an "OK", we have to _prepend_ another line,	718	# if we got an "OK", we have to _prepend_ another line,
383	# so it will be read before the second request reads its 64 bytes	719	# so it will be read before the second request reads its 64 bytes
384	# which are already in the queue when this callback is called	720	# which are already in the queue when this callback is called
385	# we don't do this in case we got an error	721	# we don't do this in case we got an error
386	if ($_[1] eq "OK") {	722	if ($_[1] eq "OK") {
387	$_[0]->unshift_read_line (sub {	723	$_[0]->unshift_read (line => sub {
388	my $response = $_[1];	724	my $response = $_[1];
389	...	725	...
390	});	726	});
391	}	727	}
392	});	728	});
393		729
394	# request two	730	# request two, simply returns 64 octets
395	$handle->push_write ("request 2\015\012");	731	$handle->push_write ("request 2\015\012");
396		732
397	# simply read 64 bytes, always	733	# simply read 64 bytes, always
398	$handle->push_read_chunk (64, sub {	734	$handle->push_read (chunk => 64, sub {
399	my $response = $_[1];	735	my $response = $_[1];
400	...	736	...
401	});	737	});
402		738
403	=over 4	739	=over 4
404		740
405	=cut	741	=cut
406		742
407	sub _drain_rbuf {	743	sub _drain_rbuf {
408	my ($self) = @_;	744	my ($self) = @_;
		745
		746	local $self->{_in_drain} = 1;
409		747
410	if (	748	if (
411	defined $self->{rbuf_max}	749	defined $self->{rbuf_max}
412	&& $self->{rbuf_max} < length $self->{rbuf}	750	&& $self->{rbuf_max} < length $self->{rbuf}
413	) {	751	) {
414	$! = &Errno::ENOSPC; return $self->error;	752	$self->_error (&Errno::ENOSPC, 1), return;
415	}	753	}
416		754
417	return if $self->{in_drain};	755	while () {
418	local $self->{in_drain} = 1;
419
420	while (my $len = length $self->{rbuf}) {	756	my $len = length $self->{rbuf};
421	no strict 'refs';	757
422	if (my $cb = shift @{ $self->{queue} }) {	758	if (my $cb = shift @{ $self->{_queue} }) {
423	if (!$cb->($self)) {	759	unless ($cb->($self)) {
424	if ($self->{eof}) {	760	if ($self->{_eof}) {
425	# no progress can be made (not enough data and no data forthcoming)	761	# no progress can be made (not enough data and no data forthcoming)
426	$! = &Errno::EPIPE; return $self->error;	762	$self->_error (&Errno::EPIPE, 1), return;
427	}	763	}
428		764
429	unshift @{ $self->{queue} }, $cb;	765	unshift @{ $self->{_queue} }, $cb;
430	return;	766	last;
431	}	767	}
432	} elsif ($self->{on_read}) {	768	} elsif ($self->{on_read}) {
		769	last unless $len;
		770
433	$self->{on_read}($self);	771	$self->{on_read}($self);
434		772
435	if (	773	if (
436	$self->{eof} # if no further data will arrive
437	&& $len == length $self->{rbuf} # and no data has been consumed	774	$len == length $self->{rbuf} # if no data has been consumed
438	&& !@{ $self->{queue} } # and the queue is still empty	775	&& !@{ $self->{_queue} } # and the queue is still empty
439	&& $self->{on_read} # and we still want to read data	776	&& $self->{on_read} # but we still have on_read
440	) {	777	) {
		778	# no further data will arrive
441	# then no progress can be made	779	# so no progress can be made
442	$! = &Errno::EPIPE; return $self->error;	780	$self->_error (&Errno::EPIPE, 1), return
		781	if $self->{_eof};
		782
		783	last; # more data might arrive
443	}	784	}
444	} else {	785	} else {
445	# read side becomes idle	786	# read side becomes idle
446	delete $self->{rw};	787	delete $self->{_rw};
447	return;	788	last;
448	}	789	}
449	}	790	}
450		791
451	if ($self->{eof}) {	792	if ($self->{_eof}) {
452	$self->_shutdown;	793	if ($self->{on_eof}) {
453	$self->{on_eof}($self)	794	$self->{on_eof}($self)
454	if $self->{on_eof};	795	} else {
		796	$self->_error (0, 1);
		797	}
		798	}
		799
		800	# may need to restart read watcher
		801	unless ($self->{_rw}) {
		802	$self->start_read
		803	if $self->{on_read} || @{ $self->{_queue} };
455	}	804	}
456	}	805	}
457		806
458	=item $handle->on_read ($cb)	807	=item $handle->on_read ($cb)
459		808
…		…
465		814
466	sub on_read {	815	sub on_read {
467	my ($self, $cb) = @_;	816	my ($self, $cb) = @_;
468		817
469	$self->{on_read} = $cb;	818	$self->{on_read} = $cb;
		819	$self->_drain_rbuf if $cb && !$self->{_in_drain};
470	}	820	}
471		821
472	=item $handle->rbuf	822	=item $handle->rbuf
473		823
474	Returns the read buffer (as a modifiable lvalue).	824	Returns the read buffer (as a modifiable lvalue).
…		…
505	interested in (which can be none at all) and return a true value. After returning	855	interested in (which can be none at all) and return a true value. After returning
506	true, it will be removed from the queue.	856	true, it will be removed from the queue.
507		857
508	=cut	858	=cut
509		859
		860	our %RH;
		861
		862	sub register_read_type($$) {
		863	$RH{$_[0]} = $_[1];
		864	}
		865
510	sub push_read {	866	sub push_read {
511	my ($self, $cb) = @_;	867	my $self = shift;
		868	my $cb = pop;
512		869
		870	if (@_) {
		871	my $type = shift;
		872
		873	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read")
		874	->($self, $cb, @_);
		875	}
		876
513	push @{ $self->{queue} }, $cb;	877	push @{ $self->{_queue} }, $cb;
514	$self->_drain_rbuf;	878	$self->_drain_rbuf unless $self->{_in_drain};
515	}	879	}
516		880
517	sub unshift_read {	881	sub unshift_read {
518	my ($self, $cb) = @_;	882	my $self = shift;
		883	my $cb = pop;
519		884
		885	if (@_) {
		886	my $type = shift;
		887
		888	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read")
		889	->($self, $cb, @_);
		890	}
		891
		892
520	push @{ $self->{queue} }, $cb;	893	unshift @{ $self->{_queue} }, $cb;
521	$self->_drain_rbuf;	894	$self->_drain_rbuf unless $self->{_in_drain};
522	}	895	}
523		896
524	=item $handle->push_read_chunk ($len, $cb->($self, $data))	897	=item $handle->push_read (type => @args, $cb)
525		898
526	=item $handle->unshift_read_chunk ($len, $cb->($self, $data))	899	=item $handle->unshift_read (type => @args, $cb)
527		900
528	Append the given callback to the end of the queue (C<push_read_chunk>) or	901	Instead of providing a callback that parses the data itself you can chose
529	prepend it (C<unshift_read_chunk>).	902	between a number of predefined parsing formats, for chunks of data, lines
		903	etc.
530		904
531	The callback will be called only once C<$len> bytes have been read, and	905	Predefined types are (if you have ideas for additional types, feel free to
532	these C<$len> bytes will be passed to the callback.	906	drop by and tell us):
533		907
534	=cut	908	=over 4
535		909
536	sub _read_chunk($$) {	910	=item chunk => $octets, $cb->($handle, $data)
		911
		912	Invoke the callback only once C<$octets> bytes have been read. Pass the
		913	data read to the callback. The callback will never be called with less
		914	data.
		915
		916	Example: read 2 bytes.
		917
		918	$handle->push_read (chunk => 2, sub {
		919	warn "yay ", unpack "H*", $_[1];
		920	});
		921
		922	=cut
		923
		924	register_read_type chunk => sub {
537	my ($self, $len, $cb) = @_;	925	my ($self, $cb, $len) = @_;
538		926
539	sub {	927	sub {
540	$len <= length $_[0]{rbuf} or return;	928	$len <= length $_[0]{rbuf} or return;
541	$cb->($_[0], substr $_[0]{rbuf}, 0, $len, "");	929	$cb->($_[0], substr $_[0]{rbuf}, 0, $len, "");
542	1	930	1
543	}	931	}
544	}	932	};
545		933
546	sub push_read_chunk {	934	=item line => [$eol, ]$cb->($handle, $line, $eol)
547	$_[0]->push_read (&_read_chunk);
548	}
549
550
551	sub unshift_read_chunk {
552	$_[0]->unshift_read (&_read_chunk);
553	}
554
555	=item $handle->push_read_line ([$eol, ]$cb->($self, $line, $eol))
556
557	=item $handle->unshift_read_line ([$eol, ]$cb->($self, $line, $eol))
558
559	Append the given callback to the end of the queue (C<push_read_line>) or
560	prepend it (C<unshift_read_line>).
561		935
562	The callback will be called only once a full line (including the end of	936	The callback will be called only once a full line (including the end of
563	line marker, C<$eol>) has been read. This line (excluding the end of line	937	line marker, C<$eol>) has been read. This line (excluding the end of line
564	marker) will be passed to the callback as second argument (C<$line>), and	938	marker) will be passed to the callback as second argument (C<$line>), and
565	the end of line marker as the third argument (C<$eol>).	939	the end of line marker as the third argument (C<$eol>).
…		…
576	Partial lines at the end of the stream will never be returned, as they are	950	Partial lines at the end of the stream will never be returned, as they are
577	not marked by the end of line marker.	951	not marked by the end of line marker.
578		952
579	=cut	953	=cut
580		954
581	sub _read_line($$) {	955	register_read_type line => sub {
582	my $self = shift;	956	my ($self, $cb, $eol) = @_;
583	my $cb = pop;
584	my $eol = @_ ? shift : qr|(\015?\012)|;
585	my $pos;
586		957
		958	if (@_ < 3) {
		959	# this is more than twice as fast as the generic code below
		960	sub {
		961	$_[0]{rbuf} =~ s/^([^\015\012]*)(\015?\012)// or return;
		962
		963	$cb->($_[0], $1, $2);
		964	1
		965	}
		966	} else {
587	$eol = quotemeta $eol unless ref $eol;	967	$eol = quotemeta $eol unless ref $eol;
588	$eol = qr|^(.*?)($eol)|s;	968	$eol = qr|^(.*?)($eol)|s;
		969
		970	sub {
		971	$_[0]{rbuf} =~ s/$eol// or return;
		972
		973	$cb->($_[0], $1, $2);
		974	1
		975	}
		976	}
		977	};
		978
		979	=item regex => $accept[, $reject[, $skip], $cb->($handle, $data)
		980
		981	Makes a regex match against the regex object C<$accept> and returns
		982	everything up to and including the match.
		983
		984	Example: read a single line terminated by '\n'.
		985
		986	$handle->push_read (regex => qr<\n>, sub { ... });
		987
		988	If C<$reject> is given and not undef, then it determines when the data is
		989	to be rejected: it is matched against the data when the C<$accept> regex
		990	does not match and generates an C<EBADMSG> error when it matches. This is
		991	useful to quickly reject wrong data (to avoid waiting for a timeout or a
		992	receive buffer overflow).
		993
		994	Example: expect a single decimal number followed by whitespace, reject
		995	anything else (not the use of an anchor).
		996
		997	$handle->push_read (regex => qr<^[0-9]+\s>, qr<[^0-9]>, sub { ... });
		998
		999	If C<$skip> is given and not C<undef>, then it will be matched against
		1000	the receive buffer when neither C<$accept> nor C<$reject> match,
		1001	and everything preceding and including the match will be accepted
		1002	unconditionally. This is useful to skip large amounts of data that you
		1003	know cannot be matched, so that the C<$accept> or C<$reject> regex do not
		1004	have to start matching from the beginning. This is purely an optimisation
		1005	and is usually worth only when you expect more than a few kilobytes.
		1006
		1007	Example: expect a http header, which ends at C<\015\012\015\012>. Since we
		1008	expect the header to be very large (it isn't in practise, but...), we use
		1009	a skip regex to skip initial portions. The skip regex is tricky in that
		1010	it only accepts something not ending in either \015 or \012, as these are
		1011	required for the accept regex.
		1012
		1013	$handle->push_read (regex =>
		1014	qr<\015\012\015\012>,
		1015	undef, # no reject
		1016	qr<^.*[^\015\012]>,
		1017	sub { ... });
		1018
		1019	=cut
		1020
		1021	register_read_type regex => sub {
		1022	my ($self, $cb, $accept, $reject, $skip) = @_;
		1023
		1024	my $data;
		1025	my $rbuf = \$self->{rbuf};
589		1026
590	sub {	1027	sub {
591	$_[0]{rbuf} =~ s/$eol// or return;	1028	# accept
		1029	if ($$rbuf =~ $accept) {
		1030	$data .= substr $$rbuf, 0, $+[0], "";
		1031	$cb->($self, $data);
		1032	return 1;
		1033	}
		1034
		1035	# reject
		1036	if ($reject && $$rbuf =~ $reject) {
		1037	$self->_error (&Errno::EBADMSG);
		1038	}
592		1039
593	$cb->($_[0], $1, $2);	1040	# skip
		1041	if ($skip && $$rbuf =~ $skip) {
		1042	$data .= substr $$rbuf, 0, $+[0], "";
		1043	}
		1044
		1045	()
		1046	}
		1047	};
		1048
		1049	=item netstring => $cb->($handle, $string)
		1050
		1051	A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement).
		1052
		1053	Throws an error with C<$!> set to EBADMSG on format violations.
		1054
		1055	=cut
		1056
		1057	register_read_type netstring => sub {
		1058	my ($self, $cb) = @_;
		1059
		1060	sub {
		1061	unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) {
		1062	if ($_[0]{rbuf} =~ /[^0-9]/) {
		1063	$self->_error (&Errno::EBADMSG);
		1064	}
		1065	return;
		1066	}
		1067
		1068	my $len = $1;
		1069
		1070	$self->unshift_read (chunk => $len, sub {
		1071	my $string = $_[1];
		1072	$_[0]->unshift_read (chunk => 1, sub {
		1073	if ($_[1] eq ",") {
		1074	$cb->($_[0], $string);
		1075	} else {
		1076	$self->_error (&Errno::EBADMSG);
		1077	}
		1078	});
		1079	});
		1080
594	1	1081	1
595	}	1082	}
596	}	1083	};
597		1084
598	sub push_read_line {	1085	=item packstring => $format, $cb->($handle, $string)
599	$_[0]->push_read (&_read_line);
600	}
601		1086
602	sub unshift_read_line {	1087	An octet string prefixed with an encoded length. The encoding C<$format>
603	$_[0]->unshift_read (&_read_line);	1088	uses the same format as a Perl C<pack> format, but must specify a single
604	}	1089	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an
		1090	optional C<!>, C<< < >> or C<< > >> modifier).
		1091
		1092	DNS over TCP uses a prefix of C<n>, EPP uses a prefix of C<N>.
		1093
		1094	Example: read a block of data prefixed by its length in BER-encoded
		1095	format (very efficient).
		1096
		1097	$handle->push_read (packstring => "w", sub {
		1098	my ($handle, $data) = @_;
		1099	});
		1100
		1101	=cut
		1102
		1103	register_read_type packstring => sub {
		1104	my ($self, $cb, $format) = @_;
		1105
		1106	sub {
		1107	# when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method
		1108	defined (my $len = eval { unpack $format, $_[0]{rbuf} })
		1109	or return;
		1110
		1111	$format = length pack $format, $len;
		1112
		1113	# bypass unshift if we already have the remaining chunk
		1114	if ($format + $len <= length $_[0]{rbuf}) {
		1115	my $data = substr $_[0]{rbuf}, $format, $len;
		1116	substr $_[0]{rbuf}, 0, $format + $len, "";
		1117	$cb->($_[0], $data);
		1118	} else {
		1119	# remove prefix
		1120	substr $_[0]{rbuf}, 0, $format, "";
		1121
		1122	# read remaining chunk
		1123	$_[0]->unshift_read (chunk => $len, $cb);
		1124	}
		1125
		1126	1
		1127	}
		1128	};
		1129
		1130	=item json => $cb->($handle, $hash_or_arrayref)
		1131
		1132	Reads a JSON object or array, decodes it and passes it to the callback.
		1133
		1134	If a C<json> object was passed to the constructor, then that will be used
		1135	for the final decode, otherwise it will create a JSON coder expecting UTF-8.
		1136
		1137	This read type uses the incremental parser available with JSON version
		1138	2.09 (and JSON::XS version 2.2) and above. You have to provide a
		1139	dependency on your own: this module will load the JSON module, but
		1140	AnyEvent does not depend on it itself.
		1141
		1142	Since JSON texts are fully self-delimiting, the C<json> read and write
		1143	types are an ideal simple RPC protocol: just exchange JSON datagrams. See
		1144	the C<json> write type description, above, for an actual example.
		1145
		1146	=cut
		1147
		1148	register_read_type json => sub {
		1149	my ($self, $cb) = @_;
		1150
		1151	require JSON;
		1152
		1153	my $data;
		1154	my $rbuf = \$self->{rbuf};
		1155
		1156	my $json = $self->{json} ||= JSON->new->utf8;
		1157
		1158	sub {
		1159	my $ref = $json->incr_parse ($self->{rbuf});
		1160
		1161	if ($ref) {
		1162	$self->{rbuf} = $json->incr_text;
		1163	$json->incr_text = "";
		1164	$cb->($self, $ref);
		1165
		1166	1
		1167	} else {
		1168	$self->{rbuf} = "";
		1169	()
		1170	}
		1171	}
		1172	};
		1173
		1174	=item storable => $cb->($handle, $ref)
		1175
		1176	Deserialises a L<Storable> frozen representation as written by the
		1177	C<storable> write type (BER-encoded length prefix followed by nfreeze'd
		1178	data).
		1179
		1180	Raises C<EBADMSG> error if the data could not be decoded.
		1181
		1182	=cut
		1183
		1184	register_read_type storable => sub {
		1185	my ($self, $cb) = @_;
		1186
		1187	require Storable;
		1188
		1189	sub {
		1190	# when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method
		1191	defined (my $len = eval { unpack "w", $_[0]{rbuf} })
		1192	or return;
		1193
		1194	my $format = length pack "w", $len;
		1195
		1196	# bypass unshift if we already have the remaining chunk
		1197	if ($format + $len <= length $_[0]{rbuf}) {
		1198	my $data = substr $_[0]{rbuf}, $format, $len;
		1199	substr $_[0]{rbuf}, 0, $format + $len, "";
		1200	$cb->($_[0], Storable::thaw ($data));
		1201	} else {
		1202	# remove prefix
		1203	substr $_[0]{rbuf}, 0, $format, "";
		1204
		1205	# read remaining chunk
		1206	$_[0]->unshift_read (chunk => $len, sub {
		1207	if (my $ref = eval { Storable::thaw ($_[1]) }) {
		1208	$cb->($_[0], $ref);
		1209	} else {
		1210	$self->_error (&Errno::EBADMSG);
		1211	}
		1212	});
		1213	}
		1214
		1215	1
		1216	}
		1217	};
		1218
		1219	=back
		1220
		1221	=item AnyEvent::Handle::register_read_type type => $coderef->($handle, $cb, @args)
		1222
		1223	This function (not method) lets you add your own types to C<push_read>.
		1224
		1225	Whenever the given C<type> is used, C<push_read> will invoke the code
		1226	reference with the handle object, the callback and the remaining
		1227	arguments.
		1228
		1229	The code reference is supposed to return a callback (usually a closure)
		1230	that works as a plain read callback (see C<< ->push_read ($cb) >>).
		1231
		1232	It should invoke the passed callback when it is done reading (remember to
		1233	pass C<$handle> as first argument as all other callbacks do that).
		1234
		1235	Note that this is a function, and all types registered this way will be
		1236	global, so try to use unique names.
		1237
		1238	For examples, see the source of this module (F<perldoc -m AnyEvent::Handle>,
		1239	search for C<register_read_type>)).
605		1240
606	=item $handle->stop_read	1241	=item $handle->stop_read
607		1242
608	=item $handle->start_read	1243	=item $handle->start_read
609		1244
610	In rare cases you actually do not want to read anything from the	1245	In rare cases you actually do not want to read anything from the
611	socket. In this case you can call C<stop_read>. Neither C<on_read> no	1246	socket. In this case you can call C<stop_read>. Neither C<on_read> nor
612	any queued callbacks will be executed then. To start reading again, call	1247	any queued callbacks will be executed then. To start reading again, call
613	C<start_read>.	1248	C<start_read>.
614		1249
		1250	Note that AnyEvent::Handle will automatically C<start_read> for you when
		1251	you change the C<on_read> callback or push/unshift a read callback, and it
		1252	will automatically C<stop_read> for you when neither C<on_read> is set nor
		1253	there are any read requests in the queue.
		1254
615	=cut	1255	=cut
616		1256
617	sub stop_read {	1257	sub stop_read {
618	my ($self) = @_;	1258	my ($self) = @_;
619		1259
620	delete $self->{rw};	1260	delete $self->{_rw};
621	}	1261	}
622		1262
623	sub start_read {	1263	sub start_read {
624	my ($self) = @_;	1264	my ($self) = @_;
625		1265
626	unless ($self->{rw} || $self->{eof}) {	1266	unless ($self->{_rw} || $self->{_eof}) {
627	Scalar::Util::weaken $self;	1267	Scalar::Util::weaken $self;
628		1268
629	$self->{rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {	1269	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {
630	my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf};	1270	my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf};
631	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf;	1271	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf;
632		1272
633	if ($len > 0) {	1273	if ($len > 0) {
		1274	$self->{_activity} = AnyEvent->now;
		1275
634	$self->{filter_r}	1276	$self->{filter_r}
635	? $self->{filter_r}->($self, $rbuf)	1277	? $self->{filter_r}($self, $rbuf)
636	: $self->_drain_rbuf;	1278	: $self->{_in_drain} || $self->_drain_rbuf;
637		1279
638	} elsif (defined $len) {	1280	} elsif (defined $len) {
639	delete $self->{rw};	1281	delete $self->{_rw};
640	$self->{eof} = 1;	1282	$self->{_eof} = 1;
641	$self->_drain_rbuf;	1283	$self->_drain_rbuf unless $self->{_in_drain};
642		1284
643	} elsif ($! != EAGAIN && $! != EINTR) {	1285	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
644	return $self->error;	1286	return $self->_error ($!, 1);
645	}	1287	}
646	});	1288	});
647	}	1289	}
648	}	1290	}
649		1291
650	sub _dotls {	1292	sub _dotls {
651	my ($self) = @_;	1293	my ($self) = @_;
652		1294
		1295	my $buf;
		1296
653	if (length $self->{tls_wbuf}) {	1297	if (length $self->{_tls_wbuf}) {
654	while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{tls_wbuf})) > 0) {	1298	while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {
655	substr $self->{tls_wbuf}, 0, $len, "";	1299	substr $self->{_tls_wbuf}, 0, $len, "";
656	}	1300	}
657	}	1301	}
658		1302
659	if (defined (my $buf = Net::SSLeay::BIO_read ($self->{tls_wbio}))) {	1303	if (length ($buf = Net::SSLeay::BIO_read ($self->{_wbio}))) {
660	$self->{wbuf} .= $buf;	1304	$self->{wbuf} .= $buf;
661	$self->_drain_wbuf;	1305	$self->_drain_wbuf;
662	}	1306	}
663		1307
664	while (defined (my $buf = Net::SSLeay::read ($self->{tls}))) {	1308	while (defined ($buf = Net::SSLeay::read ($self->{tls}))) {
		1309	if (length $buf) {
665	$self->{rbuf} .= $buf;	1310	$self->{rbuf} .= $buf;
666	$self->_drain_rbuf;	1311	$self->_drain_rbuf unless $self->{_in_drain};
		1312	} else {
		1313	# let's treat SSL-eof as we treat normal EOF
		1314	$self->{_eof} = 1;
		1315	$self->_shutdown;
		1316	return;
		1317	}
667	}	1318	}
668		1319
669	my $err = Net::SSLeay::get_error ($self->{tls}, -1);	1320	my $err = Net::SSLeay::get_error ($self->{tls}, -1);
670		1321
671	if ($err!= Net::SSLeay::ERROR_WANT_READ ()) {	1322	if ($err!= Net::SSLeay::ERROR_WANT_READ ()) {
672	if ($err == Net::SSLeay::ERROR_SYSCALL ()) {	1323	if ($err == Net::SSLeay::ERROR_SYSCALL ()) {
673	$self->error;	1324	return $self->_error ($!, 1);
674	} elsif ($err == Net::SSLeay::ERROR_SSL ()) {	1325	} elsif ($err == Net::SSLeay::ERROR_SSL ()) {
675	$! = &Errno::EIO;	1326	return $self->_error (&Errno::EIO, 1);
676	$self->error;
677	}	1327	}
678		1328
679	# all others are fine for our purposes	1329	# all others are fine for our purposes
680	}	1330	}
681	}	1331	}
…		…
690	C<"connect">, C<"accept"> or an existing Net::SSLeay object).	1340	C<"connect">, C<"accept"> or an existing Net::SSLeay object).
691		1341
692	The second argument is the optional C<Net::SSLeay::CTX> object that is	1342	The second argument is the optional C<Net::SSLeay::CTX> object that is
693	used when AnyEvent::Handle has to create its own TLS connection object.	1343	used when AnyEvent::Handle has to create its own TLS connection object.
694		1344
695	=cut	1345	The TLS connection object will end up in C<< $handle->{tls} >> after this
		1346	call and can be used or changed to your liking. Note that the handshake
		1347	might have already started when this function returns.
696		1348
697	# TODO: maybe document...	1349	=cut
		1350
698	sub starttls {	1351	sub starttls {
699	my ($self, $ssl, $ctx) = @_;	1352	my ($self, $ssl, $ctx) = @_;
700		1353
701	$self->stoptls;	1354	$self->stoptls;
702		1355
…		…
714	# but the openssl maintainers basically said: "trust us, it just works".	1367	# but the openssl maintainers basically said: "trust us, it just works".
715	# (unfortunately, we have to hardcode constants because the abysmally misdesigned	1368	# (unfortunately, we have to hardcode constants because the abysmally misdesigned
716	# and mismaintained ssleay-module doesn't even offer them).	1369	# and mismaintained ssleay-module doesn't even offer them).
717	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html	1370	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html
718	Net::SSLeay::CTX_set_mode ($self->{tls},	1371	Net::SSLeay::CTX_set_mode ($self->{tls},
719	(eval { Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1)	1372	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1)
720	| (eval { Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2));	1373	| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2));
721		1374
722	$self->{tls_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1375	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
723	$self->{tls_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1376	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
724		1377
725	Net::SSLeay::set_bio ($ssl, $self->{tls_rbio}, $self->{tls_wbio});	1378	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});
726		1379
727	$self->{filter_w} = sub {	1380	$self->{filter_w} = sub {
728	$_[0]{tls_wbuf} .= ${$_[1]};	1381	$_[0]{_tls_wbuf} .= ${$_[1]};
729	&_dotls;	1382	&_dotls;
730	};	1383	};
731	$self->{filter_r} = sub {	1384	$self->{filter_r} = sub {
732	Net::SSLeay::BIO_write ($_[0]{tls_rbio}, ${$_[1]});	1385	Net::SSLeay::BIO_write ($_[0]{_rbio}, ${$_[1]});
733	&_dotls;	1386	&_dotls;
734	};	1387	};
735	}	1388	}
736		1389
737	=item $handle->stoptls	1390	=item $handle->stoptls
…		…
743		1396
744	sub stoptls {	1397	sub stoptls {
745	my ($self) = @_;	1398	my ($self) = @_;
746		1399
747	Net::SSLeay::free (delete $self->{tls}) if $self->{tls};	1400	Net::SSLeay::free (delete $self->{tls}) if $self->{tls};
		1401
748	delete $self->{tls_rbio};	1402	delete $self->{_rbio};
749	delete $self->{tls_wbio};	1403	delete $self->{_wbio};
750	delete $self->{tls_wbuf};	1404	delete $self->{_tls_wbuf};
751	delete $self->{filter_r};	1405	delete $self->{filter_r};
752	delete $self->{filter_w};	1406	delete $self->{filter_w};
753	}	1407	}
754		1408
755	sub DESTROY {	1409	sub DESTROY {
756	my $self = shift;	1410	my $self = shift;
757		1411
758	$self->stoptls;	1412	$self->stoptls;
		1413
		1414	my $linger = exists $self->{linger} ? $self->{linger} : 3600;
		1415
		1416	if ($linger && length $self->{wbuf}) {
		1417	my $fh = delete $self->{fh};
		1418	my $wbuf = delete $self->{wbuf};
		1419
		1420	my @linger;
		1421
		1422	push @linger, AnyEvent->io (fh => $fh, poll => "w", cb => sub {
		1423	my $len = syswrite $fh, $wbuf, length $wbuf;
		1424
		1425	if ($len > 0) {
		1426	substr $wbuf, 0, $len, "";
		1427	} else {
		1428	@linger = (); # end
		1429	}
		1430	});
		1431	push @linger, AnyEvent->timer (after => $linger, cb => sub {
		1432	@linger = ();
		1433	});
		1434	}
759	}	1435	}
760		1436
761	=item AnyEvent::Handle::TLS_CTX	1437	=item AnyEvent::Handle::TLS_CTX
762		1438
763	This function creates and returns the Net::SSLeay::CTX object used by	1439	This function creates and returns the Net::SSLeay::CTX object used by
…		…
793	}	1469	}
794	}	1470	}
795		1471
796	=back	1472	=back
797		1473
		1474	=head1 SUBCLASSING AnyEvent::Handle
		1475
		1476	In many cases, you might want to subclass AnyEvent::Handle.
		1477
		1478	To make this easier, a given version of AnyEvent::Handle uses these
		1479	conventions:
		1480
		1481	=over 4
		1482
		1483	=item * all constructor arguments become object members.
		1484
		1485	At least initially, when you pass a C<tls>-argument to the constructor it
		1486	will end up in C<< $handle->{tls} >>. Those members might be changed or
		1487	mutated later on (for example C<tls> will hold the TLS connection object).
		1488
		1489	=item * other object member names are prefixed with an C<_>.
		1490
		1491	All object members not explicitly documented (internal use) are prefixed
		1492	with an underscore character, so the remaining non-C<_>-namespace is free
		1493	for use for subclasses.
		1494
		1495	=item * all members not documented here and not prefixed with an underscore
		1496	are free to use in subclasses.
		1497
		1498	Of course, new versions of AnyEvent::Handle may introduce more "public"
		1499	member variables, but thats just life, at least it is documented.
		1500
		1501	=back
		1502
798	=head1 AUTHOR	1503	=head1 AUTHOR
799		1504
800	Robin Redeker C<< <elmex at ta-sa.org> >>, Marc Lehmann <schmorp@schmorp.de>.	1505	Robin Redeker C<< <elmex at ta-sa.org> >>, Marc Lehmann <schmorp@schmorp.de>.
801		1506
802	=cut	1507	=cut

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