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Revision 1.25 by root, Sat May 24 15:19:43 2008 UTC vs.
Revision 1.93 by root, Wed Oct 1 14:49:23 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 = 4.3;
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	$cv->recv;
46		47
47	=head1 DESCRIPTION	48	=head1 DESCRIPTION
48		49
49	This module is a helper module to make it easier to do event-based I/O on	50	This module is a helper module to make it easier to do event-based I/O on
50	filehandles. For utility functions for doing non-blocking connects and accepts	51	filehandles. For utility functions for doing non-blocking connects and accepts
51	on sockets see L<AnyEvent::Util>.	52	on sockets see L<AnyEvent::Util>.
52		53
		54	The L<AnyEvent::Intro> tutorial contains some well-documented
		55	AnyEvent::Handle examples.
		56
53	In the following, when the documentation refers to of "bytes" then this	57	In the following, when the documentation refers to of "bytes" then this
54	means characters. As sysread and syswrite are used for all I/O, their	58	means characters. As sysread and syswrite are used for all I/O, their
55	treatment of characters applies to this module as well.	59	treatment of characters applies to this module as well.
56		60
57	All callbacks will be invoked with the handle object as their first	61	All callbacks will be invoked with the handle object as their first
58	argument.	62	argument.
59		63
		64	=head2 SIGPIPE is not handled by this module
		65
		66	SIGPIPE is not handled by this module, so one of the practical
		67	requirements of using it is to ignore SIGPIPE (C<$SIG{PIPE} =
		68	'IGNORE'>). At least, this is highly recommend in a networked program: If
		69	you use AnyEvent::Handle in a filter program (like sort), exiting on
		70	SIGPIPE is probably the right thing to do.
		71
60	=head1 METHODS	72	=head1 METHODS
61		73
62	=over 4	74	=over 4
63		75
64	=item B<new (%args)>	76	=item B<new (%args)>
…		…
69		81
70	=item fh => $filehandle [MANDATORY]	82	=item fh => $filehandle [MANDATORY]
71		83
72	The filehandle this L<AnyEvent::Handle> object will operate on.	84	The filehandle this L<AnyEvent::Handle> object will operate on.
73		85
74	NOTE: The filehandle will be set to non-blocking (using	86	NOTE: The filehandle will be set to non-blocking mode (using
75	AnyEvent::Util::fh_nonblocking).	87	C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in
		88	that mode.
76		89
77	=item on_eof => $cb->($self)	90	=item on_eof => $cb->($handle)
78		91
79	Set the callback to be called on EOF.	92	Set the callback to be called when an end-of-file condition is detected,
		93	i.e. in the case of a socket, when the other side has closed the
		94	connection cleanly.
80		95
		96	For sockets, this just means that the other side has stopped sending data,
		97	you can still try to write data, and, in fact, one can return from the eof
		98	callback and continue writing data, as only the read part has been shut
		99	down.
		100
81	While not mandatory, it is highly recommended to set an eof callback,	101	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	102	otherwise you might end up with a closed socket while you are still
83	waiting for data.	103	waiting for data.
84		104
		105	If an EOF condition has been detected but no C<on_eof> callback has been
		106	set, then a fatal error will be raised with C<$!> set to <0>.
		107
85	=item on_error => $cb->($self)	108	=item on_error => $cb->($handle, $fatal)
86		109
87	This is the fatal error callback, that is called when, well, a fatal error	110	This is the error callback, which is called when, well, some error
88	occurs, such as not being able to resolve the hostname, failure to connect	111	occured, such as not being able to resolve the hostname, failure to
89	or a read error.	112	connect or a read error.
90		113
91	The object will not be in a usable state when this callback has been	114	Some errors are fatal (which is indicated by C<$fatal> being true). On
92	called.	115	fatal errors the handle object will be shut down and will not be usable
		116	(but you are free to look at the current C<< ->rbuf >>). Examples of fatal
		117	errors are an EOF condition with active (but unsatisifable) read watchers
		118	(C<EPIPE>) or I/O errors.
		119
		120	Non-fatal errors can be retried by simply returning, but it is recommended
		121	to simply ignore this parameter and instead abondon the handle object
		122	when this callback is invoked. Examples of non-fatal errors are timeouts
		123	C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>).
93		124
94	On callback entrance, the value of C<$!> contains the operating system	125	On callback entrance, the value of C<$!> contains the operating system
95	error (or C<ENOSPC> or C<EPIPE>).	126	error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>).
96		127
97	While not mandatory, it is I<highly> recommended to set this callback, as	128	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	129	you will not be notified of errors otherwise. The default simply calls
99	die.	130	C<croak>.
100		131
101	=item on_read => $cb->($self)	132	=item on_read => $cb->($handle)
102		133
103	This sets the default read callback, which is called when data arrives	134	This sets the default read callback, which is called when data arrives
104	and no read request is in the queue.	135	and no read request is in the queue (unlike read queue callbacks, this
		136	callback will only be called when at least one octet of data is in the
		137	read buffer).
105		138
106	To access (and remove data from) the read buffer, use the C<< ->rbuf >>	139	To access (and remove data from) the read buffer, use the C<< ->rbuf >>
107	method or access the C<$self->{rbuf}> member directly.	140	method or access the C<$handle->{rbuf}> member directly.
108		141
109	When an EOF condition is detected then AnyEvent::Handle will first try to	142	When an EOF condition is detected then AnyEvent::Handle will first try to
110	feed all the remaining data to the queued callbacks and C<on_read> before	143	feed all the remaining data to the queued callbacks and C<on_read> before
111	calling the C<on_eof> callback. If no progress can be made, then a fatal	144	calling the C<on_eof> callback. If no progress can be made, then a fatal
112	error will be raised (with C<$!> set to C<EPIPE>).	145	error will be raised (with C<$!> set to C<EPIPE>).
113		146
114	=item on_drain => $cb->()	147	=item on_drain => $cb->($handle)
115		148
116	This sets the callback that is called when the write buffer becomes empty	149	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).	150	(or when the callback is set and the buffer is empty already).
118		151
119	To append to the write buffer, use the C<< ->push_write >> method.	152	To append to the write buffer, use the C<< ->push_write >> method.
120		153
		154	This callback is useful when you don't want to put all of your write data
		155	into the queue at once, for example, when you want to write the contents
		156	of some file to the socket you might not want to read the whole file into
		157	memory and push it into the queue, but instead only read more data from
		158	the file when the write queue becomes empty.
		159
		160	=item timeout => $fractional_seconds
		161
		162	If non-zero, then this enables an "inactivity" timeout: whenever this many
		163	seconds pass without a successful read or write on the underlying file
		164	handle, the C<on_timeout> callback will be invoked (and if that one is
		165	missing, a non-fatal C<ETIMEDOUT> error will be raised).
		166
		167	Note that timeout processing is also active when you currently do not have
		168	any outstanding read or write requests: If you plan to keep the connection
		169	idle then you should disable the timout temporarily or ignore the timeout
		170	in the C<on_timeout> callback, in which case AnyEvent::Handle will simply
		171	restart the timeout.
		172
		173	Zero (the default) disables this timeout.
		174
		175	=item on_timeout => $cb->($handle)
		176
		177	Called whenever the inactivity timeout passes. If you return from this
		178	callback, then the timeout will be reset as if some activity had happened,
		179	so this condition is not fatal in any way.
		180
121	=item rbuf_max => <bytes>	181	=item rbuf_max => <bytes>
122		182
123	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)	183	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)
124	when the read buffer ever (strictly) exceeds this size. This is useful to	184	when the read buffer ever (strictly) exceeds this size. This is useful to
125	avoid denial-of-service attacks.	185	avoid some forms of denial-of-service attacks.
126		186
127	For example, a server accepting connections from untrusted sources should	187	For example, a server accepting connections from untrusted sources should
128	be configured to accept only so-and-so much data that it cannot act on	188	be configured to accept only so-and-so much data that it cannot act on
129	(for example, when expecting a line, an attacker could send an unlimited	189	(for example, when expecting a line, an attacker could send an unlimited
130	amount of data without a callback ever being called as long as the line	190	amount of data without a callback ever being called as long as the line
131	isn't finished).	191	isn't finished).
132		192
		193	=item autocork => <boolean>
		194
		195	When disabled (the default), then C<push_write> will try to immediately
		196	write the data to the handle, if possible. This avoids having to register
		197	a write watcher and wait for the next event loop iteration, but can
		198	be inefficient if you write multiple small chunks (on the wire, this
		199	disadvantage is usually avoided by your kernel's nagle algorithm, see
		200	C<no_delay>, but this option can save costly syscalls).
		201
		202	When enabled, then writes will always be queued till the next event loop
		203	iteration. This is efficient when you do many small writes per iteration,
		204	but less efficient when you do a single write only per iteration (or when
		205	the write buffer often is full). It also increases write latency.
		206
		207	=item no_delay => <boolean>
		208
		209	When doing small writes on sockets, your operating system kernel might
		210	wait a bit for more data before actually sending it out. This is called
		211	the Nagle algorithm, and usually it is beneficial.
		212
		213	In some situations you want as low a delay as possible, which can be
		214	accomplishd by setting this option to a true value.
		215
		216	The default is your opertaing system's default behaviour (most likely
		217	enabled), this option explicitly enables or disables it, if possible.
		218
133	=item read_size => <bytes>	219	=item read_size => <bytes>
134		220
135	The default read block size (the amount of bytes this module will try to read	221	The default read block size (the amount of bytes this module will
136	on each [loop iteration). Default: C<4096>.	222	try to read during each loop iteration, which affects memory
		223	requirements). Default: C<8192>.
137		224
138	=item low_water_mark => <bytes>	225	=item low_water_mark => <bytes>
139		226
140	Sets the amount of bytes (default: C<0>) that make up an "empty" write	227	Sets the amount of bytes (default: C<0>) that make up an "empty" write
141	buffer: If the write reaches this size or gets even samller it is	228	buffer: If the write reaches this size or gets even samller it is
142	considered empty.	229	considered empty.
143		230
		231	Sometimes it can be beneficial (for performance reasons) to add data to
		232	the write buffer before it is fully drained, but this is a rare case, as
		233	the operating system kernel usually buffers data as well, so the default
		234	is good in almost all cases.
		235
		236	=item linger => <seconds>
		237
		238	If non-zero (default: C<3600>), then the destructor of the
		239	AnyEvent::Handle object will check whether there is still outstanding
		240	write data and will install a watcher that will write this data to the
		241	socket. No errors will be reported (this mostly matches how the operating
		242	system treats outstanding data at socket close time).
		243
		244	This will not work for partial TLS data that could not be encoded
		245	yet. This data will be lost. Calling the C<stoptls> method in time might
		246	help.
		247
144	=item tls => "accept" | "connect" | Net::SSLeay::SSL object	248	=item tls => "accept" | "connect" | Net::SSLeay::SSL object
145		249
146	When this parameter is given, it enables TLS (SSL) mode, that means it	250	When this parameter is given, it enables TLS (SSL) mode, that means
147	will start making tls handshake and will transparently encrypt/decrypt	251	AnyEvent will start a TLS handshake as soon as the conenction has been
148	data.	252	established and will transparently encrypt/decrypt data afterwards.
149		253
150	For the TLS server side, use C<accept>, and for the TLS client side of a	254	TLS mode requires Net::SSLeay to be installed (it will be loaded
151	connection, use C<connect> mode.	255	automatically when you try to create a TLS handle): this module doesn't
		256	have a dependency on that module, so if your module requires it, you have
		257	to add the dependency yourself.
		258
		259	Unlike TCP, TLS has a server and client side: for the TLS server side, use
		260	C<accept>, and for the TLS client side of a connection, use C<connect>
		261	mode.
152		262
153	You can also provide your own TLS connection object, but you have	263	You can also provide your own TLS connection object, but you have
154	to make sure that you call either C<Net::SSLeay::set_connect_state>	264	to make sure that you call either C<Net::SSLeay::set_connect_state>
155	or C<Net::SSLeay::set_accept_state> on it before you pass it to	265	or C<Net::SSLeay::set_accept_state> on it before you pass it to
156	AnyEvent::Handle.	266	AnyEvent::Handle.
157		267
		268	See the C<< ->starttls >> method for when need to start TLS negotiation later.
		269
158	=item tls_ctx => $ssl_ctx	270	=item tls_ctx => $ssl_ctx
159		271
160	Use the given Net::SSLeay::CTX object to create the new TLS connection	272	Use the given C<Net::SSLeay::CTX> object to create the new TLS connection
161	(unless a connection object was specified directly). If this parameter is	273	(unless a connection object was specified directly). If this parameter is
162	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.	274	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.
		275
		276	=item json => JSON or JSON::XS object
		277
		278	This is the json coder object used by the C<json> read and write types.
		279
		280	If you don't supply it, then AnyEvent::Handle will create and use a
		281	suitable one (on demand), which will write and expect UTF-8 encoded JSON
		282	texts.
		283
		284	Note that you are responsible to depend on the JSON module if you want to
		285	use this functionality, as AnyEvent does not have a dependency itself.
163		286
164	=back	287	=back
165		288
166	=cut	289	=cut
167		290
…		…
177	if ($self->{tls}) {	300	if ($self->{tls}) {
178	require Net::SSLeay;	301	require Net::SSLeay;
179	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx});	302	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx});
180	}	303	}
181		304
182	$self->on_eof (delete $self->{on_eof} ) if $self->{on_eof};	305	$self->{_activity} = AnyEvent->now;
183	$self->on_error (delete $self->{on_error}) if $self->{on_error};	306	$self->_timeout;
		307
184	$self->on_drain (delete $self->{on_drain}) if $self->{on_drain};	308	$self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain};
185	$self->on_read (delete $self->{on_read} ) if $self->{on_read};	309	$self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay};
186		310
187	$self->start_read;	311	$self->start_read
		312	if $self->{on_read};
188		313
189	$self	314	$self
190	}	315	}
191		316
192	sub _shutdown {	317	sub _shutdown {
193	my ($self) = @_;	318	my ($self) = @_;
194		319
		320	delete $self->{_tw};
195	delete $self->{rw};	321	delete $self->{_rw};
196	delete $self->{ww};	322	delete $self->{_ww};
197	delete $self->{fh};	323	delete $self->{fh};
198	}
199		324
		325	&_freetls;
		326
		327	delete $self->{on_read};
		328	delete $self->{_queue};
		329	}
		330
200	sub error {	331	sub _error {
201	my ($self) = @_;	332	my ($self, $errno, $fatal) = @_;
202		333
203	{
204	local $!;
205	$self->_shutdown;	334	$self->_shutdown
206	}	335	if $fatal;
		336
		337	$! = $errno;
207		338
208	if ($self->{on_error}) {	339	if ($self->{on_error}) {
209	$self->{on_error}($self);	340	$self->{on_error}($self, $fatal);
210	} else {	341	} else {
211	die "AnyEvent::Handle uncaught fatal error: $!";	342	Carp::croak "AnyEvent::Handle uncaught error: $!";
212	}	343	}
213	}	344	}
214		345
215	=item $fh = $handle->fh	346	=item $fh = $handle->fh
216		347
217	This method returns the file handle of the L<AnyEvent::Handle> object.	348	This method returns the file handle used to create the L<AnyEvent::Handle> object.
218		349
219	=cut	350	=cut
220		351
221	sub fh { $_[0]->{fh} }	352	sub fh { $_[0]{fh} }
222		353
223	=item $handle->on_error ($cb)	354	=item $handle->on_error ($cb)
224		355
225	Replace the current C<on_error> callback (see the C<on_error> constructor argument).	356	Replace the current C<on_error> callback (see the C<on_error> constructor argument).
226		357
…		…
238		369
239	sub on_eof {	370	sub on_eof {
240	$_[0]{on_eof} = $_[1];	371	$_[0]{on_eof} = $_[1];
241	}	372	}
242		373
		374	=item $handle->on_timeout ($cb)
		375
		376	Replace the current C<on_timeout> callback, or disables the callback (but
		377	not the timeout) if C<$cb> = C<undef>. See the C<timeout> constructor
		378	argument and method.
		379
		380	=cut
		381
		382	sub on_timeout {
		383	$_[0]{on_timeout} = $_[1];
		384	}
		385
		386	=item $handle->autocork ($boolean)
		387
		388	Enables or disables the current autocork behaviour (see C<autocork>
		389	constructor argument).
		390
		391	=cut
		392
		393	=item $handle->no_delay ($boolean)
		394
		395	Enables or disables the C<no_delay> setting (see constructor argument of
		396	the same name for details).
		397
		398	=cut
		399
		400	sub no_delay {
		401	$_[0]{no_delay} = $_[1];
		402
		403	eval {
		404	local $SIG{__DIE__};
		405	setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1];
		406	};
		407	}
		408
		409	#############################################################################
		410
		411	=item $handle->timeout ($seconds)
		412
		413	Configures (or disables) the inactivity timeout.
		414
		415	=cut
		416
		417	sub timeout {
		418	my ($self, $timeout) = @_;
		419
		420	$self->{timeout} = $timeout;
		421	$self->_timeout;
		422	}
		423
		424	# reset the timeout watcher, as neccessary
		425	# also check for time-outs
		426	sub _timeout {
		427	my ($self) = @_;
		428
		429	if ($self->{timeout}) {
		430	my $NOW = AnyEvent->now;
		431
		432	# when would the timeout trigger?
		433	my $after = $self->{_activity} + $self->{timeout} - $NOW;
		434
		435	# now or in the past already?
		436	if ($after <= 0) {
		437	$self->{_activity} = $NOW;
		438
		439	if ($self->{on_timeout}) {
		440	$self->{on_timeout}($self);
		441	} else {
		442	$self->_error (&Errno::ETIMEDOUT);
		443	}
		444
		445	# callback could have changed timeout value, optimise
		446	return unless $self->{timeout};
		447
		448	# calculate new after
		449	$after = $self->{timeout};
		450	}
		451
		452	Scalar::Util::weaken $self;
		453	return unless $self; # ->error could have destroyed $self
		454
		455	$self->{_tw} ||= AnyEvent->timer (after => $after, cb => sub {
		456	delete $self->{_tw};
		457	$self->_timeout;
		458	});
		459	} else {
		460	delete $self->{_tw};
		461	}
		462	}
		463
243	#############################################################################	464	#############################################################################
244		465
245	=back	466	=back
246		467
247	=head2 WRITE QUEUE	468	=head2 WRITE QUEUE
…		…
268	my ($self, $cb) = @_;	489	my ($self, $cb) = @_;
269		490
270	$self->{on_drain} = $cb;	491	$self->{on_drain} = $cb;
271		492
272	$cb->($self)	493	$cb->($self)
273	if $cb && $self->{low_water_mark} >= length $self->{wbuf};	494	if $cb && $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf});
274	}	495	}
275		496
276	=item $handle->push_write ($data)	497	=item $handle->push_write ($data)
277		498
278	Queues the given scalar to be written. You can push as much data as you	499	Queues the given scalar to be written. You can push as much data as you
…		…
282	=cut	503	=cut
283		504
284	sub _drain_wbuf {	505	sub _drain_wbuf {
285	my ($self) = @_;	506	my ($self) = @_;
286		507
287	unless ($self->{ww}) {	508	if (!$self->{_ww} && length $self->{wbuf}) {
		509
288	Scalar::Util::weaken $self;	510	Scalar::Util::weaken $self;
		511
289	my $cb = sub {	512	my $cb = sub {
290	my $len = syswrite $self->{fh}, $self->{wbuf};	513	my $len = syswrite $self->{fh}, $self->{wbuf};
291		514
292	if ($len > 0) {	515	if ($len >= 0) {
293	substr $self->{wbuf}, 0, $len, "";	516	substr $self->{wbuf}, 0, $len, "";
294		517
		518	$self->{_activity} = AnyEvent->now;
		519
295	$self->{on_drain}($self)	520	$self->{on_drain}($self)
296	if $self->{low_water_mark} >= length $self->{wbuf}	521	if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf})
297	&& $self->{on_drain};	522	&& $self->{on_drain};
298		523
299	delete $self->{ww} unless length $self->{wbuf};	524	delete $self->{_ww} unless length $self->{wbuf};
300	} elsif ($! != EAGAIN && $! != EINTR) {	525	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
301	$self->error;	526	$self->_error ($!, 1);
302	}	527	}
303	};	528	};
304		529
		530	# try to write data immediately
		531	$cb->() unless $self->{autocork};
		532
		533	# if still data left in wbuf, we need to poll
305	$self->{ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb);	534	$self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb)
306		535	if length $self->{wbuf};
307	$cb->($self);
308	};	536	};
		537	}
		538
		539	our %WH;
		540
		541	sub register_write_type($$) {
		542	$WH{$_[0]} = $_[1];
309	}	543	}
310		544
311	sub push_write {	545	sub push_write {
312	my $self = shift;	546	my $self = shift;
313		547
		548	if (@_ > 1) {
		549	my $type = shift;
		550
		551	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")
		552	->($self, @_);
		553	}
		554
314	if ($self->{filter_w}) {	555	if ($self->{tls}) {
315	$self->{filter_w}->($self, \$_[0]);	556	$self->{_tls_wbuf} .= $_[0];
		557	&_dotls ($self);
316	} else {	558	} else {
317	$self->{wbuf} .= $_[0];	559	$self->{wbuf} .= $_[0];
318	$self->_drain_wbuf;	560	$self->_drain_wbuf;
319	}	561	}
320	}	562	}
321		563
		564	=item $handle->push_write (type => @args)
		565
		566	Instead of formatting your data yourself, you can also let this module do
		567	the job by specifying a type and type-specific arguments.
		568
		569	Predefined types are (if you have ideas for additional types, feel free to
		570	drop by and tell us):
		571
		572	=over 4
		573
		574	=item netstring => $string
		575
		576	Formats the given value as netstring
		577	(http://cr.yp.to/proto/netstrings.txt, this is not a recommendation to use them).
		578
		579	=cut
		580
		581	register_write_type netstring => sub {
		582	my ($self, $string) = @_;
		583
		584	sprintf "%d:%s,", (length $string), $string
		585	};
		586
		587	=item packstring => $format, $data
		588
		589	An octet string prefixed with an encoded length. The encoding C<$format>
		590	uses the same format as a Perl C<pack> format, but must specify a single
		591	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an
		592	optional C<!>, C<< < >> or C<< > >> modifier).
		593
		594	=cut
		595
		596	register_write_type packstring => sub {
		597	my ($self, $format, $string) = @_;
		598
		599	pack "$format/a*", $string
		600	};
		601
		602	=item json => $array_or_hashref
		603
		604	Encodes the given hash or array reference into a JSON object. Unless you
		605	provide your own JSON object, this means it will be encoded to JSON text
		606	in UTF-8.
		607
		608	JSON objects (and arrays) are self-delimiting, so you can write JSON at
		609	one end of a handle and read them at the other end without using any
		610	additional framing.
		611
		612	The generated JSON text is guaranteed not to contain any newlines: While
		613	this module doesn't need delimiters after or between JSON texts to be
		614	able to read them, many other languages depend on that.
		615
		616	A simple RPC protocol that interoperates easily with others is to send
		617	JSON arrays (or objects, although arrays are usually the better choice as
		618	they mimic how function argument passing works) and a newline after each
		619	JSON text:
		620
		621	$handle->push_write (json => ["method", "arg1", "arg2"]); # whatever
		622	$handle->push_write ("\012");
		623
		624	An AnyEvent::Handle receiver would simply use the C<json> read type and
		625	rely on the fact that the newline will be skipped as leading whitespace:
		626
		627	$handle->push_read (json => sub { my $array = $_[1]; ... });
		628
		629	Other languages could read single lines terminated by a newline and pass
		630	this line into their JSON decoder of choice.
		631
		632	=cut
		633
		634	register_write_type json => sub {
		635	my ($self, $ref) = @_;
		636
		637	require JSON;
		638
		639	$self->{json} ? $self->{json}->encode ($ref)
		640	: JSON::encode_json ($ref)
		641	};
		642
		643	=item storable => $reference
		644
		645	Freezes the given reference using L<Storable> and writes it to the
		646	handle. Uses the C<nfreeze> format.
		647
		648	=cut
		649
		650	register_write_type storable => sub {
		651	my ($self, $ref) = @_;
		652
		653	require Storable;
		654
		655	pack "w/a*", Storable::nfreeze ($ref)
		656	};
		657
		658	=back
		659
		660	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)
		661
		662	This function (not method) lets you add your own types to C<push_write>.
		663	Whenever the given C<type> is used, C<push_write> will invoke the code
		664	reference with the handle object and the remaining arguments.
		665
		666	The code reference is supposed to return a single octet string that will
		667	be appended to the write buffer.
		668
		669	Note that this is a function, and all types registered this way will be
		670	global, so try to use unique names.
		671
		672	=cut
		673
322	#############################################################################	674	#############################################################################
323		675
324	=back	676	=back
325		677
326	=head2 READ QUEUE	678	=head2 READ QUEUE
…		…
332	ways, the "simple" way, using only C<on_read> and the "complex" way, using	684	ways, the "simple" way, using only C<on_read> and the "complex" way, using
333	a queue.	685	a queue.
334		686
335	In the simple case, you just install an C<on_read> callback and whenever	687	In the simple case, you just install an C<on_read> callback and whenever
336	new data arrives, it will be called. You can then remove some data (if	688	new data arrives, it will be called. You can then remove some data (if
337	enough is there) from the read buffer (C<< $handle->rbuf >>) if you want	689	enough is there) from the read buffer (C<< $handle->rbuf >>). Or you cna
338	or not.	690	leave the data there if you want to accumulate more (e.g. when only a
		691	partial message has been received so far).
339		692
340	In the more complex case, you want to queue multiple callbacks. In this	693	In the more complex case, you want to queue multiple callbacks. In this
341	case, AnyEvent::Handle will call the first queued callback each time new	694	case, AnyEvent::Handle will call the first queued callback each time new
342	data arrives and removes it when it has done its job (see C<push_read>,	695	data arrives (also the first time it is queued) and removes it when it has
343	below).	696	done its job (see C<push_read>, below).
344		697
345	This way you can, for example, push three line-reads, followed by reading	698	This way you can, for example, push three line-reads, followed by reading
346	a chunk of data, and AnyEvent::Handle will execute them in order.	699	a chunk of data, and AnyEvent::Handle will execute them in order.
347		700
348	Example 1: EPP protocol parser. EPP sends 4 byte length info, followed by	701	Example 1: EPP protocol parser. EPP sends 4 byte length info, followed by
349	the specified number of bytes which give an XML datagram.	702	the specified number of bytes which give an XML datagram.
350		703
351	# in the default state, expect some header bytes	704	# in the default state, expect some header bytes
352	$handle->on_read (sub {	705	$handle->on_read (sub {
353	# some data is here, now queue the length-header-read (4 octets)	706	# some data is here, now queue the length-header-read (4 octets)
354	shift->unshift_read_chunk (4, sub {	707	shift->unshift_read (chunk => 4, sub {
355	# header arrived, decode	708	# header arrived, decode
356	my $len = unpack "N", $_[1];	709	my $len = unpack "N", $_[1];
357		710
358	# now read the payload	711	# now read the payload
359	shift->unshift_read_chunk ($len, sub {	712	shift->unshift_read (chunk => $len, sub {
360	my $xml = $_[1];	713	my $xml = $_[1];
361	# handle xml	714	# handle xml
362	});	715	});
363	});	716	});
364	});	717	});
365		718
366	Example 2: Implement a client for a protocol that replies either with	719	Example 2: Implement a client for a protocol that replies either with "OK"
367	"OK" and another line or "ERROR" for one request, and 64 bytes for the	720	and another line or "ERROR" for the first request that is sent, and 64
368	second request. Due tot he availability of a full queue, we can just	721	bytes for the second request. Due to the availability of a queue, we can
369	pipeline sending both requests and manipulate the queue as necessary in	722	just pipeline sending both requests and manipulate the queue as necessary
370	the callbacks:	723	in the callbacks.
371		724
372	# request one	725	When the first callback is called and sees an "OK" response, it will
		726	C<unshift> another line-read. This line-read will be queued I<before> the
		727	64-byte chunk callback.
		728
		729	# request one, returns either "OK + extra line" or "ERROR"
373	$handle->push_write ("request 1\015\012");	730	$handle->push_write ("request 1\015\012");
374		731
375	# we expect "ERROR" or "OK" as response, so push a line read	732	# we expect "ERROR" or "OK" as response, so push a line read
376	$handle->push_read_line (sub {	733	$handle->push_read (line => sub {
377	# if we got an "OK", we have to _prepend_ another line,	734	# if we got an "OK", we have to _prepend_ another line,
378	# so it will be read before the second request reads its 64 bytes	735	# so it will be read before the second request reads its 64 bytes
379	# which are already in the queue when this callback is called	736	# which are already in the queue when this callback is called
380	# we don't do this in case we got an error	737	# we don't do this in case we got an error
381	if ($_[1] eq "OK") {	738	if ($_[1] eq "OK") {
382	$_[0]->unshift_read_line (sub {	739	$_[0]->unshift_read (line => sub {
383	my $response = $_[1];	740	my $response = $_[1];
384	...	741	...
385	});	742	});
386	}	743	}
387	});	744	});
388		745
389	# request two	746	# request two, simply returns 64 octets
390	$handle->push_write ("request 2\015\012");	747	$handle->push_write ("request 2\015\012");
391		748
392	# simply read 64 bytes, always	749	# simply read 64 bytes, always
393	$handle->push_read_chunk (64, sub {	750	$handle->push_read (chunk => 64, sub {
394	my $response = $_[1];	751	my $response = $_[1];
395	...	752	...
396	});	753	});
397		754
398	=over 4	755	=over 4
399		756
400	=cut	757	=cut
401		758
402	sub _drain_rbuf {	759	sub _drain_rbuf {
403	my ($self) = @_;	760	my ($self) = @_;
		761
		762	local $self->{_in_drain} = 1;
404		763
405	if (	764	if (
406	defined $self->{rbuf_max}	765	defined $self->{rbuf_max}
407	&& $self->{rbuf_max} < length $self->{rbuf}	766	&& $self->{rbuf_max} < length $self->{rbuf}
408	) {	767	) {
409	$! = &Errno::ENOSPC; return $self->error;	768	$self->_error (&Errno::ENOSPC, 1), return;
410	}	769	}
411		770
412	return if $self->{in_drain};	771	while () {
413	local $self->{in_drain} = 1;
414
415	while (my $len = length $self->{rbuf}) {	772	my $len = length $self->{rbuf};
416	no strict 'refs';	773
417	if (my $cb = shift @{ $self->{queue} }) {	774	if (my $cb = shift @{ $self->{_queue} }) {
418	if (!$cb->($self)) {	775	unless ($cb->($self)) {
419	if ($self->{eof}) {	776	if ($self->{_eof}) {
420	# 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)
421	$! = &Errno::EPIPE; return $self->error;	778	$self->_error (&Errno::EPIPE, 1), return;
422	}	779	}
423		780
424	unshift @{ $self->{queue} }, $cb;	781	unshift @{ $self->{_queue} }, $cb;
425	return;	782	last;
426	}	783	}
427	} elsif ($self->{on_read}) {	784	} elsif ($self->{on_read}) {
		785	last unless $len;
		786
428	$self->{on_read}($self);	787	$self->{on_read}($self);
429		788
430	if (	789	if (
431	$self->{eof} # if no further data will arrive
432	&& $len == length $self->{rbuf} # and no data has been consumed	790	$len == length $self->{rbuf} # if no data has been consumed
433	&& !@{ $self->{queue} } # and the queue is still empty	791	&& !@{ $self->{_queue} } # and the queue is still empty
434	&& $self->{on_read} # and we still want to read data	792	&& $self->{on_read} # but we still have on_read
435	) {	793	) {
		794	# no further data will arrive
436	# then no progress can be made	795	# so no progress can be made
437	$! = &Errno::EPIPE; return $self->error;	796	$self->_error (&Errno::EPIPE, 1), return
		797	if $self->{_eof};
		798
		799	last; # more data might arrive
438	}	800	}
439	} else {	801	} else {
440	# read side becomes idle	802	# read side becomes idle
441	delete $self->{rw};	803	delete $self->{_rw} unless $self->{tls};
442	return;	804	last;
443	}	805	}
444	}	806	}
445		807
446	if ($self->{eof}) {	808	if ($self->{_eof}) {
447	$self->_shutdown;	809	if ($self->{on_eof}) {
448	$self->{on_eof}($self)	810	$self->{on_eof}($self)
449	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} };
450	}	820	}
451	}	821	}
452		822
453	=item $handle->on_read ($cb)	823	=item $handle->on_read ($cb)
454		824
…		…
460		830
461	sub on_read {	831	sub on_read {
462	my ($self, $cb) = @_;	832	my ($self, $cb) = @_;
463		833
464	$self->{on_read} = $cb;	834	$self->{on_read} = $cb;
		835	$self->_drain_rbuf if $cb && !$self->{_in_drain};
465	}	836	}
466		837
467	=item $handle->rbuf	838	=item $handle->rbuf
468		839
469	Returns the read buffer (as a modifiable lvalue).	840	Returns the read buffer (as a modifiable lvalue).
…		…
500	interested in (which can be none at all) and return a true value. After returning	871	interested in (which can be none at all) and return a true value. After returning
501	true, it will be removed from the queue.	872	true, it will be removed from the queue.
502		873
503	=cut	874	=cut
504		875
		876	our %RH;
		877
		878	sub register_read_type($$) {
		879	$RH{$_[0]} = $_[1];
		880	}
		881
505	sub push_read {	882	sub push_read {
506	my ($self, $cb) = @_;	883	my $self = shift;
		884	my $cb = pop;
507		885
		886	if (@_) {
		887	my $type = shift;
		888
		889	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read")
		890	->($self, $cb, @_);
		891	}
		892
508	push @{ $self->{queue} }, $cb;	893	push @{ $self->{_queue} }, $cb;
509	$self->_drain_rbuf;	894	$self->_drain_rbuf unless $self->{_in_drain};
510	}	895	}
511		896
512	sub unshift_read {	897	sub unshift_read {
513	my ($self, $cb) = @_;	898	my $self = shift;
		899	my $cb = pop;
514		900
		901	if (@_) {
		902	my $type = shift;
		903
		904	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read")
		905	->($self, $cb, @_);
		906	}
		907
		908
515	push @{ $self->{queue} }, $cb;	909	unshift @{ $self->{_queue} }, $cb;
516	$self->_drain_rbuf;	910	$self->_drain_rbuf unless $self->{_in_drain};
517	}	911	}
518		912
519	=item $handle->push_read_chunk ($len, $cb->($self, $data))	913	=item $handle->push_read (type => @args, $cb)
520		914
521	=item $handle->unshift_read_chunk ($len, $cb->($self, $data))	915	=item $handle->unshift_read (type => @args, $cb)
522		916
523	Append the given callback to the end of the queue (C<push_read_chunk>) or	917	Instead of providing a callback that parses the data itself you can chose
524	prepend it (C<unshift_read_chunk>).	918	between a number of predefined parsing formats, for chunks of data, lines
		919	etc.
525		920
526	The callback will be called only once C<$len> bytes have been read, and	921	Predefined types are (if you have ideas for additional types, feel free to
527	these C<$len> bytes will be passed to the callback.	922	drop by and tell us):
528		923
529	=cut	924	=over 4
530		925
531	sub _read_chunk($$) {	926	=item chunk => $octets, $cb->($handle, $data)
		927
		928	Invoke the callback only once C<$octets> bytes have been read. Pass the
		929	data read to the callback. The callback will never be called with less
		930	data.
		931
		932	Example: read 2 bytes.
		933
		934	$handle->push_read (chunk => 2, sub {
		935	warn "yay ", unpack "H*", $_[1];
		936	});
		937
		938	=cut
		939
		940	register_read_type chunk => sub {
532	my ($self, $len, $cb) = @_;	941	my ($self, $cb, $len) = @_;
533		942
534	sub {	943	sub {
535	$len <= length $_[0]{rbuf} or return;	944	$len <= length $_[0]{rbuf} or return;
536	$cb->($_[0], substr $_[0]{rbuf}, 0, $len, "");	945	$cb->($_[0], substr $_[0]{rbuf}, 0, $len, "");
537	1	946	1
538	}	947	}
539	}	948	};
540		949
541	sub push_read_chunk {	950	=item line => [$eol, ]$cb->($handle, $line, $eol)
542	$_[0]->push_read (&_read_chunk);
543	}
544
545
546	sub unshift_read_chunk {
547	$_[0]->unshift_read (&_read_chunk);
548	}
549
550	=item $handle->push_read_line ([$eol, ]$cb->($self, $line, $eol))
551
552	=item $handle->unshift_read_line ([$eol, ]$cb->($self, $line, $eol))
553
554	Append the given callback to the end of the queue (C<push_read_line>) or
555	prepend it (C<unshift_read_line>).
556		951
557	The callback will be called only once a full line (including the end of	952	The callback will be called only once a full line (including the end of
558	line marker, C<$eol>) has been read. This line (excluding the end of line	953	line marker, C<$eol>) has been read. This line (excluding the end of line
559	marker) will be passed to the callback as second argument (C<$line>), and	954	marker) will be passed to the callback as second argument (C<$line>), and
560	the end of line marker as the third argument (C<$eol>).	955	the end of line marker as the third argument (C<$eol>).
…		…
571	Partial lines at the end of the stream will never be returned, as they are	966	Partial lines at the end of the stream will never be returned, as they are
572	not marked by the end of line marker.	967	not marked by the end of line marker.
573		968
574	=cut	969	=cut
575		970
576	sub _read_line($$) {	971	register_read_type line => sub {
577	my $self = shift;	972	my ($self, $cb, $eol) = @_;
578	my $cb = pop;
579	my $eol = @_ ? shift : qr|(\015?\012)|;
580	my $pos;
581		973
		974	if (@_ < 3) {
		975	# this is more than twice as fast as the generic code below
		976	sub {
		977	$_[0]{rbuf} =~ s/^([^\015\012]*)(\015?\012)// or return;
		978
		979	$cb->($_[0], $1, $2);
		980	1
		981	}
		982	} else {
582	$eol = quotemeta $eol unless ref $eol;	983	$eol = quotemeta $eol unless ref $eol;
583	$eol = qr|^(.*?)($eol)|s;	984	$eol = qr|^(.*?)($eol)|s;
		985
		986	sub {
		987	$_[0]{rbuf} =~ s/$eol// or return;
		988
		989	$cb->($_[0], $1, $2);
		990	1
		991	}
		992	}
		993	};
		994
		995	=item regex => $accept[, $reject[, $skip], $cb->($handle, $data)
		996
		997	Makes a regex match against the regex object C<$accept> and returns
		998	everything up to and including the match.
		999
		1000	Example: read a single line terminated by '\n'.
		1001
		1002	$handle->push_read (regex => qr<\n>, sub { ... });
		1003
		1004	If C<$reject> is given and not undef, then it determines when the data is
		1005	to be rejected: it is matched against the data when the C<$accept> regex
		1006	does not match and generates an C<EBADMSG> error when it matches. This is
		1007	useful to quickly reject wrong data (to avoid waiting for a timeout or a
		1008	receive buffer overflow).
		1009
		1010	Example: expect a single decimal number followed by whitespace, reject
		1011	anything else (not the use of an anchor).
		1012
		1013	$handle->push_read (regex => qr<^[0-9]+\s>, qr<[^0-9]>, sub { ... });
		1014
		1015	If C<$skip> is given and not C<undef>, then it will be matched against
		1016	the receive buffer when neither C<$accept> nor C<$reject> match,
		1017	and everything preceding and including the match will be accepted
		1018	unconditionally. This is useful to skip large amounts of data that you
		1019	know cannot be matched, so that the C<$accept> or C<$reject> regex do not
		1020	have to start matching from the beginning. This is purely an optimisation
		1021	and is usually worth only when you expect more than a few kilobytes.
		1022
		1023	Example: expect a http header, which ends at C<\015\012\015\012>. Since we
		1024	expect the header to be very large (it isn't in practise, but...), we use
		1025	a skip regex to skip initial portions. The skip regex is tricky in that
		1026	it only accepts something not ending in either \015 or \012, as these are
		1027	required for the accept regex.
		1028
		1029	$handle->push_read (regex =>
		1030	qr<\015\012\015\012>,
		1031	undef, # no reject
		1032	qr<^.*[^\015\012]>,
		1033	sub { ... });
		1034
		1035	=cut
		1036
		1037	register_read_type regex => sub {
		1038	my ($self, $cb, $accept, $reject, $skip) = @_;
		1039
		1040	my $data;
		1041	my $rbuf = \$self->{rbuf};
584		1042
585	sub {	1043	sub {
586	$_[0]{rbuf} =~ s/$eol// or return;	1044	# accept
		1045	if ($$rbuf =~ $accept) {
		1046	$data .= substr $$rbuf, 0, $+[0], "";
		1047	$cb->($self, $data);
		1048	return 1;
		1049	}
		1050
		1051	# reject
		1052	if ($reject && $$rbuf =~ $reject) {
		1053	$self->_error (&Errno::EBADMSG);
		1054	}
587		1055
588	$cb->($_[0], $1, $2);	1056	# skip
		1057	if ($skip && $$rbuf =~ $skip) {
		1058	$data .= substr $$rbuf, 0, $+[0], "";
		1059	}
		1060
		1061	()
		1062	}
		1063	};
		1064
		1065	=item netstring => $cb->($handle, $string)
		1066
		1067	A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement).
		1068
		1069	Throws an error with C<$!> set to EBADMSG on format violations.
		1070
		1071	=cut
		1072
		1073	register_read_type netstring => sub {
		1074	my ($self, $cb) = @_;
		1075
		1076	sub {
		1077	unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) {
		1078	if ($_[0]{rbuf} =~ /[^0-9]/) {
		1079	$self->_error (&Errno::EBADMSG);
		1080	}
		1081	return;
		1082	}
		1083
		1084	my $len = $1;
		1085
		1086	$self->unshift_read (chunk => $len, sub {
		1087	my $string = $_[1];
		1088	$_[0]->unshift_read (chunk => 1, sub {
		1089	if ($_[1] eq ",") {
		1090	$cb->($_[0], $string);
		1091	} else {
		1092	$self->_error (&Errno::EBADMSG);
		1093	}
		1094	});
		1095	});
		1096
589	1	1097	1
590	}	1098	}
591	}	1099	};
592		1100
593	sub push_read_line {	1101	=item packstring => $format, $cb->($handle, $string)
594	$_[0]->push_read (&_read_line);
595	}
596		1102
597	sub unshift_read_line {	1103	An octet string prefixed with an encoded length. The encoding C<$format>
598	$_[0]->unshift_read (&_read_line);	1104	uses the same format as a Perl C<pack> format, but must specify a single
599	}	1105	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an
		1106	optional C<!>, C<< < >> or C<< > >> modifier).
		1107
		1108	DNS over TCP uses a prefix of C<n>, EPP uses a prefix of C<N>.
		1109
		1110	Example: read a block of data prefixed by its length in BER-encoded
		1111	format (very efficient).
		1112
		1113	$handle->push_read (packstring => "w", sub {
		1114	my ($handle, $data) = @_;
		1115	});
		1116
		1117	=cut
		1118
		1119	register_read_type packstring => sub {
		1120	my ($self, $cb, $format) = @_;
		1121
		1122	sub {
		1123	# when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method
		1124	defined (my $len = eval { unpack $format, $_[0]{rbuf} })
		1125	or return;
		1126
		1127	$format = length pack $format, $len;
		1128
		1129	# bypass unshift if we already have the remaining chunk
		1130	if ($format + $len <= length $_[0]{rbuf}) {
		1131	my $data = substr $_[0]{rbuf}, $format, $len;
		1132	substr $_[0]{rbuf}, 0, $format + $len, "";
		1133	$cb->($_[0], $data);
		1134	} else {
		1135	# remove prefix
		1136	substr $_[0]{rbuf}, 0, $format, "";
		1137
		1138	# read remaining chunk
		1139	$_[0]->unshift_read (chunk => $len, $cb);
		1140	}
		1141
		1142	1
		1143	}
		1144	};
		1145
		1146	=item json => $cb->($handle, $hash_or_arrayref)
		1147
		1148	Reads a JSON object or array, decodes it and passes it to the callback.
		1149
		1150	If a C<json> object was passed to the constructor, then that will be used
		1151	for the final decode, otherwise it will create a JSON coder expecting UTF-8.
		1152
		1153	This read type uses the incremental parser available with JSON version
		1154	2.09 (and JSON::XS version 2.2) and above. You have to provide a
		1155	dependency on your own: this module will load the JSON module, but
		1156	AnyEvent does not depend on it itself.
		1157
		1158	Since JSON texts are fully self-delimiting, the C<json> read and write
		1159	types are an ideal simple RPC protocol: just exchange JSON datagrams. See
		1160	the C<json> write type description, above, for an actual example.
		1161
		1162	=cut
		1163
		1164	register_read_type json => sub {
		1165	my ($self, $cb) = @_;
		1166
		1167	require JSON;
		1168
		1169	my $data;
		1170	my $rbuf = \$self->{rbuf};
		1171
		1172	my $json = $self->{json} ||= JSON->new->utf8;
		1173
		1174	sub {
		1175	my $ref = $json->incr_parse ($self->{rbuf});
		1176
		1177	if ($ref) {
		1178	$self->{rbuf} = $json->incr_text;
		1179	$json->incr_text = "";
		1180	$cb->($self, $ref);
		1181
		1182	1
		1183	} else {
		1184	$self->{rbuf} = "";
		1185	()
		1186	}
		1187	}
		1188	};
		1189
		1190	=item storable => $cb->($handle, $ref)
		1191
		1192	Deserialises a L<Storable> frozen representation as written by the
		1193	C<storable> write type (BER-encoded length prefix followed by nfreeze'd
		1194	data).
		1195
		1196	Raises C<EBADMSG> error if the data could not be decoded.
		1197
		1198	=cut
		1199
		1200	register_read_type storable => sub {
		1201	my ($self, $cb) = @_;
		1202
		1203	require Storable;
		1204
		1205	sub {
		1206	# when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method
		1207	defined (my $len = eval { unpack "w", $_[0]{rbuf} })
		1208	or return;
		1209
		1210	my $format = length pack "w", $len;
		1211
		1212	# bypass unshift if we already have the remaining chunk
		1213	if ($format + $len <= length $_[0]{rbuf}) {
		1214	my $data = substr $_[0]{rbuf}, $format, $len;
		1215	substr $_[0]{rbuf}, 0, $format + $len, "";
		1216	$cb->($_[0], Storable::thaw ($data));
		1217	} else {
		1218	# remove prefix
		1219	substr $_[0]{rbuf}, 0, $format, "";
		1220
		1221	# read remaining chunk
		1222	$_[0]->unshift_read (chunk => $len, sub {
		1223	if (my $ref = eval { Storable::thaw ($_[1]) }) {
		1224	$cb->($_[0], $ref);
		1225	} else {
		1226	$self->_error (&Errno::EBADMSG);
		1227	}
		1228	});
		1229	}
		1230
		1231	1
		1232	}
		1233	};
		1234
		1235	=back
		1236
		1237	=item AnyEvent::Handle::register_read_type type => $coderef->($handle, $cb, @args)
		1238
		1239	This function (not method) lets you add your own types to C<push_read>.
		1240
		1241	Whenever the given C<type> is used, C<push_read> will invoke the code
		1242	reference with the handle object, the callback and the remaining
		1243	arguments.
		1244
		1245	The code reference is supposed to return a callback (usually a closure)
		1246	that works as a plain read callback (see C<< ->push_read ($cb) >>).
		1247
		1248	It should invoke the passed callback when it is done reading (remember to
		1249	pass C<$handle> as first argument as all other callbacks do that).
		1250
		1251	Note that this is a function, and all types registered this way will be
		1252	global, so try to use unique names.
		1253
		1254	For examples, see the source of this module (F<perldoc -m AnyEvent::Handle>,
		1255	search for C<register_read_type>)).
600		1256
601	=item $handle->stop_read	1257	=item $handle->stop_read
602		1258
603	=item $handle->start_read	1259	=item $handle->start_read
604		1260
605	In rare cases you actually do not want to read anything from the	1261	In rare cases you actually do not want to read anything from the
606	socket. In this case you can call C<stop_read>. Neither C<on_read> no	1262	socket. In this case you can call C<stop_read>. Neither C<on_read> nor
607	any queued callbacks will be executed then. To start reading again, call	1263	any queued callbacks will be executed then. To start reading again, call
608	C<start_read>.	1264	C<start_read>.
609		1265
		1266	Note that AnyEvent::Handle will automatically C<start_read> for you when
		1267	you change the C<on_read> callback or push/unshift a read callback, and it
		1268	will automatically C<stop_read> for you when neither C<on_read> is set nor
		1269	there are any read requests in the queue.
		1270
		1271	These methods will have no effect when in TLS mode (as TLS doesn't support
		1272	half-duplex connections).
		1273
610	=cut	1274	=cut
611		1275
612	sub stop_read {	1276	sub stop_read {
613	my ($self) = @_;	1277	my ($self) = @_;
614		1278
615	delete $self->{rw};	1279	delete $self->{_rw} unless $self->{tls};
616	}	1280	}
617		1281
618	sub start_read {	1282	sub start_read {
619	my ($self) = @_;	1283	my ($self) = @_;
620		1284
621	unless ($self->{rw} || $self->{eof}) {	1285	unless ($self->{_rw} || $self->{_eof}) {
622	Scalar::Util::weaken $self;	1286	Scalar::Util::weaken $self;
623		1287
624	$self->{rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {	1288	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {
625	my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf};	1289	my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});
626	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf;	1290	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf;
627		1291
628	if ($len > 0) {	1292	if ($len > 0) {
629	$self->{filter_r}	1293	$self->{_activity} = AnyEvent->now;
630	? $self->{filter_r}->($self, $rbuf)	1294
631	: $self->_drain_rbuf;	1295	if ($self->{tls}) {
		1296	Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);
		1297	&_dotls ($self);
		1298	} else {
		1299	$self->_drain_rbuf unless $self->{_in_drain};
		1300	}
632		1301
633	} elsif (defined $len) {	1302	} elsif (defined $len) {
634	delete $self->{rw};	1303	delete $self->{_rw};
635	$self->{eof} = 1;	1304	$self->{_eof} = 1;
636	$self->_drain_rbuf;	1305	$self->_drain_rbuf unless $self->{_in_drain};
637		1306
638	} elsif ($! != EAGAIN && $! != EINTR) {	1307	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
639	return $self->error;	1308	return $self->_error ($!, 1);
640	}	1309	}
641	});	1310	});
642	}	1311	}
643	}	1312	}
644		1313
645	sub _dotls {	1314	sub _dotls {
646	my ($self) = @_;	1315	my ($self) = @_;
647		1316
		1317	my $buf;
		1318
648	if (length $self->{tls_wbuf}) {	1319	if (length $self->{_tls_wbuf}) {
649	while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{tls_wbuf})) > 0) {	1320	while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {
650	substr $self->{tls_wbuf}, 0, $len, "";	1321	substr $self->{_tls_wbuf}, 0, $len, "";
651	}	1322	}
652	}	1323	}
653		1324
		1325	while (defined ($buf = Net::SSLeay::read ($self->{tls}))) {
		1326	unless (length $buf) {
		1327	# let's treat SSL-eof as we treat normal EOF
		1328	delete $self->{_rw};
		1329	$self->{_eof} = 1;
		1330	&_freetls;
		1331	}
		1332
		1333	$self->{rbuf} .= $buf;
		1334	$self->_drain_rbuf unless $self->{_in_drain};
		1335	$self->{tls} or return; # tls session might have gone away in callback
		1336	}
		1337
		1338	my $err = Net::SSLeay::get_error ($self->{tls}, -1);
		1339
		1340	if ($err!= Net::SSLeay::ERROR_WANT_READ ()) {
		1341	if ($err == Net::SSLeay::ERROR_SYSCALL ()) {
		1342	return $self->_error ($!, 1);
		1343	} elsif ($err == Net::SSLeay::ERROR_SSL ()) {
		1344	return $self->_error (&Errno::EIO, 1);
		1345	}
		1346
		1347	# all others are fine for our purposes
		1348	}
		1349
654	if (defined (my $buf = Net::SSLeay::BIO_read ($self->{tls_wbio}))) {	1350	if (length ($buf = Net::SSLeay::BIO_read ($self->{_wbio}))) {
655	$self->{wbuf} .= $buf;	1351	$self->{wbuf} .= $buf;
656	$self->_drain_wbuf;	1352	$self->_drain_wbuf;
657	}
658
659	while (defined (my $buf = Net::SSLeay::read ($self->{tls}))) {
660	$self->{rbuf} .= $buf;
661	$self->_drain_rbuf;
662	}
663
664	my $err = Net::SSLeay::get_error ($self->{tls}, -1);
665
666	if ($err!= Net::SSLeay::ERROR_WANT_READ ()) {
667	if ($err == Net::SSLeay::ERROR_SYSCALL ()) {
668	$self->error;
669	} elsif ($err == Net::SSLeay::ERROR_SSL ()) {
670	$! = &Errno::EIO;
671	$self->error;
672	}
673
674	# all others are fine for our purposes
675	}	1353	}
676	}	1354	}
677		1355
678	=item $handle->starttls ($tls[, $tls_ctx])	1356	=item $handle->starttls ($tls[, $tls_ctx])
679		1357
…		…
685	C<"connect">, C<"accept"> or an existing Net::SSLeay object).	1363	C<"connect">, C<"accept"> or an existing Net::SSLeay object).
686		1364
687	The second argument is the optional C<Net::SSLeay::CTX> object that is	1365	The second argument is the optional C<Net::SSLeay::CTX> object that is
688	used when AnyEvent::Handle has to create its own TLS connection object.	1366	used when AnyEvent::Handle has to create its own TLS connection object.
689		1367
690	=cut	1368	The TLS connection object will end up in C<< $handle->{tls} >> after this
		1369	call and can be used or changed to your liking. Note that the handshake
		1370	might have already started when this function returns.
691		1371
692	# TODO: maybe document...	1372	If it an error to start a TLS handshake more than once per
		1373	AnyEvent::Handle object (this is due to bugs in OpenSSL).
		1374
		1375	=cut
		1376
693	sub starttls {	1377	sub starttls {
694	my ($self, $ssl, $ctx) = @_;	1378	my ($self, $ssl, $ctx) = @_;
695		1379
696	$self->stoptls;	1380	Carp::croak "it is an error to call starttls more than once on an Anyevent::Handle object"
697		1381	if $self->{tls};
		1382
698	if ($ssl eq "accept") {	1383	if ($ssl eq "accept") {
699	$ssl = Net::SSLeay::new ($ctx || TLS_CTX ());	1384	$ssl = Net::SSLeay::new ($ctx || TLS_CTX ());
700	Net::SSLeay::set_accept_state ($ssl);	1385	Net::SSLeay::set_accept_state ($ssl);
701	} elsif ($ssl eq "connect") {	1386	} elsif ($ssl eq "connect") {
702	$ssl = Net::SSLeay::new ($ctx || TLS_CTX ());	1387	$ssl = Net::SSLeay::new ($ctx || TLS_CTX ());
…		…
707		1392
708	# basically, this is deep magic (because SSL_read should have the same issues)	1393	# basically, this is deep magic (because SSL_read should have the same issues)
709	# but the openssl maintainers basically said: "trust us, it just works".	1394	# but the openssl maintainers basically said: "trust us, it just works".
710	# (unfortunately, we have to hardcode constants because the abysmally misdesigned	1395	# (unfortunately, we have to hardcode constants because the abysmally misdesigned
711	# and mismaintained ssleay-module doesn't even offer them).	1396	# and mismaintained ssleay-module doesn't even offer them).
		1397	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html
		1398	#
		1399	# in short: this is a mess.
		1400	#
		1401	# note that we do not try to keep the length constant between writes as we are required to do.
		1402	# we assume that most (but not all) of this insanity only applies to non-blocking cases,
		1403	# and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to
		1404	# have identity issues in that area.
712	Net::SSLeay::CTX_set_mode ($self->{tls},	1405	Net::SSLeay::CTX_set_mode ($self->{tls},
713	(eval { Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1)	1406	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1)
714	| (eval { Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2));	1407	| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2));
715		1408
716	$self->{tls_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1409	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
717	$self->{tls_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1410	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
718		1411
719	Net::SSLeay::set_bio ($ssl, $self->{tls_rbio}, $self->{tls_wbio});	1412	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});
720		1413
721	$self->{filter_w} = sub {	1414	&_dotls; # need to trigger the initial handshake
722	$_[0]{tls_wbuf} .= ${$_[1]};	1415	$self->start_read; # make sure we actually do read
723	&_dotls;
724	};
725	$self->{filter_r} = sub {
726	Net::SSLeay::BIO_write ($_[0]{tls_rbio}, ${$_[1]});
727	&_dotls;
728	};
729	}	1416	}
730		1417
731	=item $handle->stoptls	1418	=item $handle->stoptls
732		1419
733	Destroys the SSL connection, if any. Partial read or write data will be	1420	Shuts down the SSL connection - this makes a proper EOF handshake by
734	lost.	1421	sending a close notify to the other side, but since OpenSSL doesn't
		1422	support non-blocking shut downs, it is not possible to re-use the stream
		1423	afterwards.
735		1424
736	=cut	1425	=cut
737		1426
738	sub stoptls {	1427	sub stoptls {
739	my ($self) = @_;	1428	my ($self) = @_;
740		1429
		1430	if ($self->{tls}) {
		1431	Net::SSLeay::shutdown $self->{tls};
		1432
		1433	&_dotls;
		1434
		1435	# we don't give a shit. no, we do, but we can't. no...
		1436	# we, we... have to use openssl :/
		1437	&_freetls;
		1438	}
		1439	}
		1440
		1441	sub _freetls {
		1442	my ($self) = @_;
		1443
		1444	return unless $self->{tls};
		1445
741	Net::SSLeay::free (delete $self->{tls}) if $self->{tls};	1446	Net::SSLeay::free (delete $self->{tls});
742	delete $self->{tls_rbio};	1447
743	delete $self->{tls_wbio};	1448	delete @$self{qw(_rbio _wbio _tls_wbuf)};
744	delete $self->{tls_wbuf};
745	delete $self->{filter_r};
746	delete $self->{filter_w};
747	}	1449	}
748		1450
749	sub DESTROY {	1451	sub DESTROY {
750	my $self = shift;	1452	my $self = shift;
751		1453
752	$self->stoptls;	1454	&_freetls;
		1455
		1456	my $linger = exists $self->{linger} ? $self->{linger} : 3600;
		1457
		1458	if ($linger && length $self->{wbuf}) {
		1459	my $fh = delete $self->{fh};
		1460	my $wbuf = delete $self->{wbuf};
		1461
		1462	my @linger;
		1463
		1464	push @linger, AnyEvent->io (fh => $fh, poll => "w", cb => sub {
		1465	my $len = syswrite $fh, $wbuf, length $wbuf;
		1466
		1467	if ($len > 0) {
		1468	substr $wbuf, 0, $len, "";
		1469	} else {
		1470	@linger = (); # end
		1471	}
		1472	});
		1473	push @linger, AnyEvent->timer (after => $linger, cb => sub {
		1474	@linger = ();
		1475	});
		1476	}
753	}	1477	}
754		1478
755	=item AnyEvent::Handle::TLS_CTX	1479	=item AnyEvent::Handle::TLS_CTX
756		1480
757	This function creates and returns the Net::SSLeay::CTX object used by	1481	This function creates and returns the Net::SSLeay::CTX object used by
…		…
787	}	1511	}
788	}	1512	}
789		1513
790	=back	1514	=back
791		1515
		1516	=head1 SUBCLASSING AnyEvent::Handle
		1517
		1518	In many cases, you might want to subclass AnyEvent::Handle.
		1519
		1520	To make this easier, a given version of AnyEvent::Handle uses these
		1521	conventions:
		1522
		1523	=over 4
		1524
		1525	=item * all constructor arguments become object members.
		1526
		1527	At least initially, when you pass a C<tls>-argument to the constructor it
		1528	will end up in C<< $handle->{tls} >>. Those members might be changed or
		1529	mutated later on (for example C<tls> will hold the TLS connection object).
		1530
		1531	=item * other object member names are prefixed with an C<_>.
		1532
		1533	All object members not explicitly documented (internal use) are prefixed
		1534	with an underscore character, so the remaining non-C<_>-namespace is free
		1535	for use for subclasses.
		1536
		1537	=item * all members not documented here and not prefixed with an underscore
		1538	are free to use in subclasses.
		1539
		1540	Of course, new versions of AnyEvent::Handle may introduce more "public"
		1541	member variables, but thats just life, at least it is documented.
		1542
		1543	=back
		1544
792	=head1 AUTHOR	1545	=head1 AUTHOR
793		1546
794	Robin Redeker C<< <elmex at ta-sa.org> >>, Marc Lehmann <schmorp@schmorp.de>.	1547	Robin Redeker C<< <elmex at ta-sa.org> >>, Marc Lehmann <schmorp@schmorp.de>.
795		1548
796	=cut	1549	=cut

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