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

Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.43 by root, Wed May 28 23:57:38 2008 UTC vs.
Revision 1.115 by root, Tue Feb 10 13:58:49 2009 UTC

…		…
1	package AnyEvent::Handle;	1	package AnyEvent::Handle;
2		2
3	no warnings;	3	no warnings;
4	use strict;	4	use strict qw(subs vars);
5		5
6	use AnyEvent ();	6	use AnyEvent ();
7	use AnyEvent::Util qw(WSAEWOULDBLOCK);	7	use AnyEvent::Util qw(WSAEWOULDBLOCK);
8	use Scalar::Util ();	8	use Scalar::Util ();
9	use Carp ();	9	use Carp ();
10	use Fcntl ();	10	use Fcntl ();
11	use Errno qw(EAGAIN EINTR);	11	use Errno qw(EAGAIN EINTR);
12	use Time::HiRes qw(time);
13		12
14	=head1 NAME	13	=head1 NAME
15		14
16	AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent	15	AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent
17		16
18	=cut	17	=cut
19		18
20	our $VERSION = '0.04';	19	our $VERSION = 4.331;
21		20
22	=head1 SYNOPSIS	21	=head1 SYNOPSIS
23		22
24	use AnyEvent;	23	use AnyEvent;
25	use AnyEvent::Handle;	24	use AnyEvent::Handle;
28		27
29	my $handle =	28	my $handle =
30	AnyEvent::Handle->new (	29	AnyEvent::Handle->new (
31	fh => \*STDIN,	30	fh => \*STDIN,
32	on_eof => sub {	31	on_eof => sub {
33	$cv->broadcast;	32	$cv->send;
34	},	33	},
35	);	34	);
36		35
37	# send some request line	36	# send some request line
38	$handle->push_write ("getinfo\015\012");	37	$handle->push_write ("getinfo\015\012");
…		…
50		49
51	This module is a helper module to make it easier to do event-based I/O on	50	This module is a helper module to make it easier to do event-based I/O on
52	filehandles. For utility functions for doing non-blocking connects and accepts	51	filehandles. For utility functions for doing non-blocking connects and accepts
53	on sockets see L<AnyEvent::Util>.	52	on sockets see L<AnyEvent::Util>.
54		53
		54	The L<AnyEvent::Intro> tutorial contains some well-documented
		55	AnyEvent::Handle examples.
		56
55	In the following, when the documentation refers to of "bytes" then this	57	In the following, when the documentation refers to of "bytes" then this
56	means characters. As sysread and syswrite are used for all I/O, their	58	means characters. As sysread and syswrite are used for all I/O, their
57	treatment of characters applies to this module as well.	59	treatment of characters applies to this module as well.
58		60
59	All callbacks will be invoked with the handle object as their first	61	All callbacks will be invoked with the handle object as their first
…		…
71		73
72	=item fh => $filehandle [MANDATORY]	74	=item fh => $filehandle [MANDATORY]
73		75
74	The filehandle this L<AnyEvent::Handle> object will operate on.	76	The filehandle this L<AnyEvent::Handle> object will operate on.
75		77
76	NOTE: The filehandle will be set to non-blocking (using	78	NOTE: The filehandle will be set to non-blocking mode (using
77	AnyEvent::Util::fh_nonblocking).	79	C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in
		80	that mode.
78		81
79	=item on_eof => $cb->($handle)	82	=item on_eof => $cb->($handle)
80		83
81	Set the callback to be called on EOF.	84	Set the callback to be called when an end-of-file condition is detected,
		85	i.e. in the case of a socket, when the other side has closed the
		86	connection cleanly.
82		87
		88	For sockets, this just means that the other side has stopped sending data,
		89	you can still try to write data, and, in fact, one can return from the EOF
		90	callback and continue writing data, as only the read part has been shut
		91	down.
		92
83	While not mandatory, it is highly recommended to set an eof callback,	93	While not mandatory, it is I<highly> recommended to set an EOF callback,
84	otherwise you might end up with a closed socket while you are still	94	otherwise you might end up with a closed socket while you are still
85	waiting for data.	95	waiting for data.
86		96
		97	If an EOF condition has been detected but no C<on_eof> callback has been
		98	set, then a fatal error will be raised with C<$!> set to <0>.
		99
87	=item on_error => $cb->($handle)	100	=item on_error => $cb->($handle, $fatal)
88		101
89	This is the fatal error callback, that is called when, well, a fatal error	102	This is the error callback, which is called when, well, some error
90	occurs, such as not being able to resolve the hostname, failure to connect	103	occured, such as not being able to resolve the hostname, failure to
91	or a read error.	104	connect or a read error.
92		105
93	The object will not be in a usable state when this callback has been	106	Some errors are fatal (which is indicated by C<$fatal> being true). On
94	called.	107	fatal errors the handle object will be shut down and will not be usable
		108	(but you are free to look at the current C<< ->rbuf >>). Examples of fatal
		109	errors are an EOF condition with active (but unsatisifable) read watchers
		110	(C<EPIPE>) or I/O errors.
		111
		112	Non-fatal errors can be retried by simply returning, but it is recommended
		113	to simply ignore this parameter and instead abondon the handle object
		114	when this callback is invoked. Examples of non-fatal errors are timeouts
		115	C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>).
95		116
96	On callback entrance, the value of C<$!> contains the operating system	117	On callback entrance, the value of C<$!> contains the operating system
97	error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>).	118	error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>).
98		119
99	The callback should throw an exception. If it returns, then
100	AnyEvent::Handle will C<croak> for you.
101
102	While not mandatory, it is I<highly> recommended to set this callback, as	120	While not mandatory, it is I<highly> recommended to set this callback, as
103	you will not be notified of errors otherwise. The default simply calls	121	you will not be notified of errors otherwise. The default simply calls
104	die.	122	C<croak>.
105		123
106	=item on_read => $cb->($handle)	124	=item on_read => $cb->($handle)
107		125
108	This sets the default read callback, which is called when data arrives	126	This sets the default read callback, which is called when data arrives
109	and no read request is in the queue.	127	and no read request is in the queue (unlike read queue callbacks, this
		128	callback will only be called when at least one octet of data is in the
		129	read buffer).
110		130
111	To access (and remove data from) the read buffer, use the C<< ->rbuf >>	131	To access (and remove data from) the read buffer, use the C<< ->rbuf >>
112	method or access the C<$handle->{rbuf}> member directly.	132	method or access the C<$handle->{rbuf}> member directly.
113		133
114	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
…		…
121	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
122	(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).
123		143
124	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.
125		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
126	=item timeout => $fractional_seconds	152	=item timeout => $fractional_seconds
127		153
128	If non-zero, then this enables an "inactivity" timeout: whenever this many	154	If non-zero, then this enables an "inactivity" timeout: whenever this many
129	seconds pass without a successful read or write on the underlying file	155	seconds pass without a successful read or write on the underlying file
130	handle, the C<on_timeout> callback will be invoked (and if that one is	156	handle, the C<on_timeout> callback will be invoked (and if that one is
131	missing, an C<ETIMEDOUT> errror will be raised).	157	missing, a non-fatal C<ETIMEDOUT> error will be raised).
132		158
133	Note that timeout processing is also active when you currently do not have	159	Note that timeout processing is also active when you currently do not have
134	any outstanding read or write requests: If you plan to keep the connection	160	any outstanding read or write requests: If you plan to keep the connection
135	idle then you should disable the timout temporarily or ignore the timeout	161	idle then you should disable the timout temporarily or ignore the timeout
136	in the C<on_timeout> callback.	162	in the C<on_timeout> callback, in which case AnyEvent::Handle will simply
		163	restart the timeout.
137		164
138	Zero (the default) disables this timeout.	165	Zero (the default) disables this timeout.
139		166
140	=item on_timeout => $cb->($handle)	167	=item on_timeout => $cb->($handle)
141		168
…		…
145		172
146	=item rbuf_max => <bytes>	173	=item rbuf_max => <bytes>
147		174
148	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)	175	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)
149	when the read buffer ever (strictly) exceeds this size. This is useful to	176	when the read buffer ever (strictly) exceeds this size. This is useful to
150	avoid denial-of-service attacks.	177	avoid some forms of denial-of-service attacks.
151		178
152	For example, a server accepting connections from untrusted sources should	179	For example, a server accepting connections from untrusted sources should
153	be configured to accept only so-and-so much data that it cannot act on	180	be configured to accept only so-and-so much data that it cannot act on
154	(for example, when expecting a line, an attacker could send an unlimited	181	(for example, when expecting a line, an attacker could send an unlimited
155	amount of data without a callback ever being called as long as the line	182	amount of data without a callback ever being called as long as the line
156	isn't finished).	183	isn't finished).
157		184
		185	=item autocork => <boolean>
		186
		187	When disabled (the default), then C<push_write> will try to immediately
		188	write the data to the handle, if possible. This avoids having to register
		189	a write watcher and wait for the next event loop iteration, but can
		190	be inefficient if you write multiple small chunks (on the wire, this
		191	disadvantage is usually avoided by your kernel's nagle algorithm, see
		192	C<no_delay>, but this option can save costly syscalls).
		193
		194	When enabled, then writes will always be queued till the next event loop
		195	iteration. This is efficient when you do many small writes per iteration,
		196	but less efficient when you do a single write only per iteration (or when
		197	the write buffer often is full). It also increases write latency.
		198
		199	=item no_delay => <boolean>
		200
		201	When doing small writes on sockets, your operating system kernel might
		202	wait a bit for more data before actually sending it out. This is called
		203	the Nagle algorithm, and usually it is beneficial.
		204
		205	In some situations you want as low a delay as possible, which can be
		206	accomplishd by setting this option to a true value.
		207
		208	The default is your opertaing system's default behaviour (most likely
		209	enabled), this option explicitly enables or disables it, if possible.
		210
158	=item read_size => <bytes>	211	=item read_size => <bytes>
159		212
160	The default read block size (the amount of bytes this module will try to read	213	The default read block size (the amount of bytes this module will
161	on each [loop iteration). Default: C<4096>.	214	try to read during each loop iteration, which affects memory
		215	requirements). Default: C<8192>.
162		216
163	=item low_water_mark => <bytes>	217	=item low_water_mark => <bytes>
164		218
165	Sets the amount of bytes (default: C<0>) that make up an "empty" write	219	Sets the amount of bytes (default: C<0>) that make up an "empty" write
166	buffer: If the write reaches this size or gets even samller it is	220	buffer: If the write reaches this size or gets even samller it is
167	considered empty.	221	considered empty.
168		222
		223	Sometimes it can be beneficial (for performance reasons) to add data to
		224	the write buffer before it is fully drained, but this is a rare case, as
		225	the operating system kernel usually buffers data as well, so the default
		226	is good in almost all cases.
		227
		228	=item linger => <seconds>
		229
		230	If non-zero (default: C<3600>), then the destructor of the
		231	AnyEvent::Handle object will check whether there is still outstanding
		232	write data and will install a watcher that will write this data to the
		233	socket. No errors will be reported (this mostly matches how the operating
		234	system treats outstanding data at socket close time).
		235
		236	This will not work for partial TLS data that could not be encoded
		237	yet. This data will be lost. Calling the C<stoptls> method in time might
		238	help.
		239
169	=item tls => "accept" \| "connect" \| Net::SSLeay::SSL object	240	=item tls => "accept" \| "connect" \| Net::SSLeay::SSL object
170		241
171	When this parameter is given, it enables TLS (SSL) mode, that means it	242	When this parameter is given, it enables TLS (SSL) mode, that means
172	will start making tls handshake and will transparently encrypt/decrypt	243	AnyEvent will start a TLS handshake as soon as the conenction has been
173	data.	244	established and will transparently encrypt/decrypt data afterwards.
174		245
175	TLS mode requires Net::SSLeay to be installed (it will be loaded	246	TLS mode requires Net::SSLeay to be installed (it will be loaded
176	automatically when you try to create a TLS handle).	247	automatically when you try to create a TLS handle): this module doesn't
		248	have a dependency on that module, so if your module requires it, you have
		249	to add the dependency yourself.
177		250
178	For the TLS server side, use C<accept>, and for the TLS client side of a	251	Unlike TCP, TLS has a server and client side: for the TLS server side, use
179	connection, use C<connect> mode.	252	C<accept>, and for the TLS client side of a connection, use C<connect>
		253	mode.
180		254
181	You can also provide your own TLS connection object, but you have	255	You can also provide your own TLS connection object, but you have
182	to make sure that you call either C<Net::SSLeay::set_connect_state>	256	to make sure that you call either C<Net::SSLeay::set_connect_state>
183	or C<Net::SSLeay::set_accept_state> on it before you pass it to	257	or C<Net::SSLeay::set_accept_state> on it before you pass it to
184	AnyEvent::Handle.	258	AnyEvent::Handle.
185		259
		260	B<IMPORTANT:> since Net::SSLeay "objects" are really only integers,
		261	passing in the wrong integer will lead to certain crash. This most often
		262	happens when one uses a stylish C<< tls => 1 >> and is surprised about the
		263	segmentation fault.
		264
186	See the C<starttls> method if you need to start TLs negotiation later.	265	See the C<< ->starttls >> method for when need to start TLS negotiation later.
187		266
188	=item tls_ctx => $ssl_ctx	267	=item tls_ctx => $ssl_ctx
189		268
190	Use the given Net::SSLeay::CTX object to create the new TLS connection	269	Use the given C<Net::SSLeay::CTX> object to create the new TLS connection
191	(unless a connection object was specified directly). If this parameter is	270	(unless a connection object was specified directly). If this parameter is
192	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.	271	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.
193		272
194	=item json => JSON or JSON::XS object	273	=item json => JSON or JSON::XS object
195		274
196	This is the json coder object used by the C<json> read and write types.	275	This is the json coder object used by the C<json> read and write types.
197		276
198	If you don't supply it, then AnyEvent::Handle will create and use a	277	If you don't supply it, then AnyEvent::Handle will create and use a
199	suitable one, which will write and expect UTF-8 encoded JSON texts.	278	suitable one (on demand), which will write and expect UTF-8 encoded JSON
		279	texts.
200		280
201	Note that you are responsible to depend on the JSON module if you want to	281	Note that you are responsible to depend on the JSON module if you want to
202	use this functionality, as AnyEvent does not have a dependency itself.	282	use this functionality, as AnyEvent does not have a dependency itself.
203		283
204	=item filter_r => $cb
205
206	=item filter_w => $cb
207
208	These exist, but are undocumented at this time.
209
210	=back	284	=back
211		285
212	=cut	286	=cut
213		287
214	sub new {	288	sub new {
…		…
218		292
219	$self->{fh} or Carp::croak "mandatory argument fh is missing";	293	$self->{fh} or Carp::croak "mandatory argument fh is missing";
220		294
221	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;	295	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;
222		296
223	if ($self->{tls}) {
224	require Net::SSLeay;
225	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx});	297	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx})
226	}	298	if $self->{tls};
227		299
228	# $self->on_eof (delete $self->{on_eof} ) if $self->{on_eof}; # nop
229	# $self->on_error (delete $self->{on_error}) if $self->{on_error}; # nop
230	# $self->on_read (delete $self->{on_read} ) if $self->{on_read}; # nop
231	$self->on_drain (delete $self->{on_drain}) if $self->{on_drain};
232
233	$self->{_activity} = time;	300	$self->{_activity} = AnyEvent->now;
234	$self->_timeout;	301	$self->_timeout;
235		302
		303	$self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain};
		304	$self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay};
		305
236	$self->start_read;	306	$self->start_read
		307	if $self->{on_read};
237		308
238	$self	309	$self
239	}	310	}
240		311
241	sub _shutdown {	312	sub _shutdown {
242	my ($self) = @_;	313	my ($self) = @_;
243		314
		315	delete $self->{_tw};
244	delete $self->{_rw};	316	delete $self->{_rw};
245	delete $self->{_ww};	317	delete $self->{_ww};
246	delete $self->{fh};	318	delete $self->{fh};
247	}
248		319
		320	&_freetls;
		321
		322	delete $self->{on_read};
		323	delete $self->{_queue};
		324	}
		325
249	sub error {	326	sub _error {
250	my ($self) = @_;	327	my ($self, $errno, $fatal) = @_;
251		328
252	{
253	local $!;
254	$self->_shutdown;	329	$self->_shutdown
255	}	330	if $fatal;
256		331
257	$self->{on_error}($self)	332	$! = $errno;
		333
258	if $self->{on_error};	334	if ($self->{on_error}) {
259		335	$self->{on_error}($self, $fatal);
		336	} elsif ($self->{fh}) {
260	Carp::croak "AnyEvent::Handle uncaught fatal error: $!";	337	Carp::croak "AnyEvent::Handle uncaught error: $!";
		338	}
261	}	339	}
262		340
263	=item $fh = $handle->fh	341	=item $fh = $handle->fh
264		342
265	This method returns the file handle of the L<AnyEvent::Handle> object.	343	This method returns the file handle used to create the L<AnyEvent::Handle> object.
266		344
267	=cut	345	=cut
268		346
269	sub fh { $_[0]{fh} }	347	sub fh { $_[0]{fh} }
270		348
…		…
288	$_[0]{on_eof} = $_[1];	366	$_[0]{on_eof} = $_[1];
289	}	367	}
290		368
291	=item $handle->on_timeout ($cb)	369	=item $handle->on_timeout ($cb)
292		370
293	Replace the current C<on_timeout> callback, or disables the callback	371	Replace the current C<on_timeout> callback, or disables the callback (but
294	(but not the timeout) if C<$cb> = C<undef>. See C<timeout> constructor	372	not the timeout) if C<$cb> = C<undef>. See the C<timeout> constructor
295	argument.	373	argument and method.
296		374
297	=cut	375	=cut
298		376
299	sub on_timeout {	377	sub on_timeout {
300	$_[0]{on_timeout} = $_[1];	378	$_[0]{on_timeout} = $_[1];
		379	}
		380
		381	=item $handle->autocork ($boolean)
		382
		383	Enables or disables the current autocork behaviour (see C<autocork>
		384	constructor argument). Changes will only take effect on the next write.
		385
		386	=cut
		387
		388	sub autocork {
		389	$_[0]{autocork} = $_[1];
		390	}
		391
		392	=item $handle->no_delay ($boolean)
		393
		394	Enables or disables the C<no_delay> setting (see constructor argument of
		395	the same name for details).
		396
		397	=cut
		398
		399	sub no_delay {
		400	$_[0]{no_delay} = $_[1];
		401
		402	eval {
		403	local $SIG{__DIE__};
		404	setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1];
		405	};
301	}	406	}
302		407
303	#############################################################################	408	#############################################################################
304		409
305	=item $handle->timeout ($seconds)	410	=item $handle->timeout ($seconds)
…		…
319	# also check for time-outs	424	# also check for time-outs
320	sub _timeout {	425	sub _timeout {
321	my ($self) = @_;	426	my ($self) = @_;
322		427
323	if ($self->{timeout}) {	428	if ($self->{timeout}) {
324	my $NOW = time;	429	my $NOW = AnyEvent->now;
325		430
326	# when would the timeout trigger?	431	# when would the timeout trigger?
327	my $after = $self->{_activity} + $self->{timeout} - $NOW;	432	my $after = $self->{_activity} + $self->{timeout} - $NOW;
328
329	warn "next to in $after\n";#d#
330		433
331	# now or in the past already?	434	# now or in the past already?
332	if ($after <= 0) {	435	if ($after <= 0) {
333	$self->{_activity} = $NOW;	436	$self->{_activity} = $NOW;
334		437
335	if ($self->{on_timeout}) {	438	if ($self->{on_timeout}) {
336	$self->{on_timeout}->($self);	439	$self->{on_timeout}($self);
337	} else {	440	} else {
338	$! = Errno::ETIMEDOUT;	441	$self->_error (&Errno::ETIMEDOUT);
339	$self->error;
340	}	442	}
341		443
342	# callbakx could have changed timeout value, optimise	444	# callback could have changed timeout value, optimise
343	return unless $self->{timeout};	445	return unless $self->{timeout};
344		446
345	# calculate new after	447	# calculate new after
346	$after = $self->{timeout};	448	$after = $self->{timeout};
347	}	449	}
348		450
349	Scalar::Util::weaken $self;	451	Scalar::Util::weaken $self;
		452	return unless $self; # ->error could have destroyed $self
350		453
351	warn "after $after\n";#d#
352	$self->{_tw} \|\|= AnyEvent->timer (after => $after, cb => sub {	454	$self->{_tw} \|\|= AnyEvent->timer (after => $after, cb => sub {
353	delete $self->{_tw};	455	delete $self->{_tw};
354	$self->_timeout;	456	$self->_timeout;
355	});	457	});
356	} else {	458	} else {
…		…
386	my ($self, $cb) = @_;	488	my ($self, $cb) = @_;
387		489
388	$self->{on_drain} = $cb;	490	$self->{on_drain} = $cb;
389		491
390	$cb->($self)	492	$cb->($self)
391	if $cb && $self->{low_water_mark} >= length $self->{wbuf};	493	if $cb && $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf});
392	}	494	}
393		495
394	=item $handle->push_write ($data)	496	=item $handle->push_write ($data)
395		497
396	Queues the given scalar to be written. You can push as much data as you	498	Queues the given scalar to be written. You can push as much data as you
…		…
410	my $len = syswrite $self->{fh}, $self->{wbuf};	512	my $len = syswrite $self->{fh}, $self->{wbuf};
411		513
412	if ($len >= 0) {	514	if ($len >= 0) {
413	substr $self->{wbuf}, 0, $len, "";	515	substr $self->{wbuf}, 0, $len, "";
414		516
415	$self->{_activity} = time;	517	$self->{_activity} = AnyEvent->now;
416		518
417	$self->{on_drain}($self)	519	$self->{on_drain}($self)
418	if $self->{low_water_mark} >= length $self->{wbuf}	520	if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf})
419	&& $self->{on_drain};	521	&& $self->{on_drain};
420		522
421	delete $self->{_ww} unless length $self->{wbuf};	523	delete $self->{_ww} unless length $self->{wbuf};
422	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	524	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
423	$self->error;	525	$self->_error ($!, 1);
424	}	526	}
425	};	527	};
426		528
427	# try to write data immediately	529	# try to write data immediately
428	$cb->();	530	$cb->() unless $self->{autocork};
429		531
430	# if still data left in wbuf, we need to poll	532	# if still data left in wbuf, we need to poll
431	$self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb)	533	$self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb)
432	if length $self->{wbuf};	534	if length $self->{wbuf};
433	};	535	};
…		…
447		549
448	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")	550	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")
449	->($self, @_);	551	->($self, @_);
450	}	552	}
451		553
452	if ($self->{filter_w}) {	554	if ($self->{tls}) {
453	$self->{filter_w}->($self, \$_[0]);	555	$self->{_tls_wbuf} .= $_[0];
		556
		557	&_dotls ($self);
454	} else {	558	} else {
455	$self->{wbuf} .= $_[0];	559	$self->{wbuf} .= $_[0];
456	$self->_drain_wbuf;	560	$self->_drain_wbuf;
457	}	561	}
458	}	562	}
459		563
460	=item $handle->push_write (type => @args)	564	=item $handle->push_write (type => @args)
461		565
462	=item $handle->unshift_write (type => @args)
463
464	Instead of formatting your data yourself, you can also let this module do	566	Instead of formatting your data yourself, you can also let this module do
465	the job by specifying a type and type-specific arguments.	567	the job by specifying a type and type-specific arguments.
466		568
467	Predefined types are (if you have ideas for additional types, feel free to	569	Predefined types are (if you have ideas for additional types, feel free to
468	drop by and tell us):	570	drop by and tell us):
…		…
472	=item netstring => $string	574	=item netstring => $string
473		575
474	Formats the given value as netstring	576	Formats the given value as netstring
475	(http://cr.yp.to/proto/netstrings.txt, this is not a recommendation to use them).	577	(http://cr.yp.to/proto/netstrings.txt, this is not a recommendation to use them).
476		578
477	=back
478
479	=cut	579	=cut
480		580
481	register_write_type netstring => sub {	581	register_write_type netstring => sub {
482	my ($self, $string) = @_;	582	my ($self, $string) = @_;
483		583
484	sprintf "%d:%s,", (length $string), $string	584	(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
485	};	600	};
486		601
487	=item json => $array_or_hashref	602	=item json => $array_or_hashref
488		603
489	Encodes the given hash or array reference into a JSON object. Unless you	604	Encodes the given hash or array reference into a JSON object. Unless you
…		…
523		638
524	$self->{json} ? $self->{json}->encode ($ref)	639	$self->{json} ? $self->{json}->encode ($ref)
525	: JSON::encode_json ($ref)	640	: JSON::encode_json ($ref)
526	};	641	};
527		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
528	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)	660	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)
529		661
530	This function (not method) lets you add your own types to C<push_write>.	662	This function (not method) lets you add your own types to C<push_write>.
531	Whenever the given C<type> is used, C<push_write> will invoke the code	663	Whenever the given C<type> is used, C<push_write> will invoke the code
532	reference with the handle object and the remaining arguments.	664	reference with the handle object and the remaining arguments.
…		…
552	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
553	a queue.	685	a queue.
554		686
555	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
556	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
557	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
558	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).
559		692
560	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
561	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
562	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
563	below).	696	done its job (see C<push_read>, below).
564		697
565	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
566	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.
567		700
568	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
569	the specified number of bytes which give an XML datagram.	702	the specified number of bytes which give an XML datagram.
570		703
571	# in the default state, expect some header bytes	704	# in the default state, expect some header bytes
572	$handle->on_read (sub {	705	$handle->on_read (sub {
573	# 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)
574	shift->unshift_read_chunk (4, sub {	707	shift->unshift_read (chunk => 4, sub {
575	# header arrived, decode	708	# header arrived, decode
576	my $len = unpack "N", $_[1];	709	my $len = unpack "N", $_[1];
577		710
578	# now read the payload	711	# now read the payload
579	shift->unshift_read_chunk ($len, sub {	712	shift->unshift_read (chunk => $len, sub {
580	my $xml = $_[1];	713	my $xml = $_[1];
581	# handle xml	714	# handle xml
582	});	715	});
583	});	716	});
584	});	717	});
585		718
586	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"
587	"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
588	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
589	pipeline sending both requests and manipulate the queue as necessary in	722	just pipeline sending both requests and manipulate the queue as necessary
590	the callbacks:	723	in the callbacks.
591		724
592	# 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"
593	$handle->push_write ("request 1\015\012");	730	$handle->push_write ("request 1\015\012");
594		731
595	# 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
596	$handle->push_read_line (sub {	733	$handle->push_read (line => sub {
597	# if we got an "OK", we have to _prepend_ another line,	734	# if we got an "OK", we have to _prepend_ another line,
598	# so it will be read before the second request reads its 64 bytes	735	# so it will be read before the second request reads its 64 bytes
599	# which are already in the queue when this callback is called	736	# which are already in the queue when this callback is called
600	# we don't do this in case we got an error	737	# we don't do this in case we got an error
601	if ($_[1] eq "OK") {	738	if ($_[1] eq "OK") {
602	$_[0]->unshift_read_line (sub {	739	$_[0]->unshift_read (line => sub {
603	my $response = $_[1];	740	my $response = $_[1];
604	...	741	...
605	});	742	});
606	}	743	}
607	});	744	});
608		745
609	# request two	746	# request two, simply returns 64 octets
610	$handle->push_write ("request 2\015\012");	747	$handle->push_write ("request 2\015\012");
611		748
612	# simply read 64 bytes, always	749	# simply read 64 bytes, always
613	$handle->push_read_chunk (64, sub {	750	$handle->push_read (chunk => 64, sub {
614	my $response = $_[1];	751	my $response = $_[1];
615	...	752	...
616	});	753	});
617		754
618	=over 4	755	=over 4
619		756
620	=cut	757	=cut
621		758
622	sub _drain_rbuf {	759	sub _drain_rbuf {
623	my ($self) = @_;	760	my ($self) = @_;
		761
		762	local $self->{_in_drain} = 1;
624		763
625	if (	764	if (
626	defined $self->{rbuf_max}	765	defined $self->{rbuf_max}
627	&& $self->{rbuf_max} < length $self->{rbuf}	766	&& $self->{rbuf_max} < length $self->{rbuf}
628	) {	767	) {
629	$! = &Errno::ENOSPC;	768	$self->_error (&Errno::ENOSPC, 1), return;
630	$self->error;
631	}	769	}
632		770
633	return if $self->{in_drain};	771	while () {
634	local $self->{in_drain} = 1;	772	$self->{rbuf} .= delete $self->{tls_rbuf} if exists $self->{tls_rbuf};#d#
635		773
636	while (my $len = length $self->{rbuf}) {	774	my $len = length $self->{rbuf};
637	no strict 'refs';	775
638	if (my $cb = shift @{ $self->{_queue} }) {	776	if (my $cb = shift @{ $self->{_queue} }) {
639	unless ($cb->($self)) {	777	unless ($cb->($self)) {
640	if ($self->{_eof}) {	778	if ($self->{_eof}) {
641	# no progress can be made (not enough data and no data forthcoming)	779	# no progress can be made (not enough data and no data forthcoming)
642	$! = &Errno::EPIPE;	780	$self->_error (&Errno::EPIPE, 1), return;
643	$self->error;
644	}	781	}
645		782
646	unshift @{ $self->{_queue} }, $cb;	783	unshift @{ $self->{_queue} }, $cb;
647	return;	784	last;
648	}	785	}
649	} elsif ($self->{on_read}) {	786	} elsif ($self->{on_read}) {
		787	last unless $len;
		788
650	$self->{on_read}($self);	789	$self->{on_read}($self);
651		790
652	if (	791	if (
653	$self->{_eof} # if no further data will arrive
654	&& $len == length $self->{rbuf} # and no data has been consumed	792	$len == length $self->{rbuf} # if no data has been consumed
655	&& !@{ $self->{_queue} } # and the queue is still empty	793	&& !@{ $self->{_queue} } # and the queue is still empty
656	&& $self->{on_read} # and we still want to read data	794	&& $self->{on_read} # but we still have on_read
657	) {	795	) {
		796	# no further data will arrive
658	# then no progress can be made	797	# so no progress can be made
659	$! = &Errno::EPIPE;	798	$self->_error (&Errno::EPIPE, 1), return
660	$self->error;	799	if $self->{_eof};
		800
		801	last; # more data might arrive
661	}	802	}
662	} else {	803	} else {
663	# read side becomes idle	804	# read side becomes idle
664	delete $self->{_rw};	805	delete $self->{_rw} unless $self->{tls};
665	return;	806	last;
666	}	807	}
667	}	808	}
668		809
669	if ($self->{_eof}) {	810	if ($self->{_eof}) {
670	$self->_shutdown;	811	if ($self->{on_eof}) {
671	$self->{on_eof}($self)	812	$self->{on_eof}($self)
672	if $self->{on_eof};	813	} else {
		814	$self->_error (0, 1);
		815	}
		816	}
		817
		818	# may need to restart read watcher
		819	unless ($self->{_rw}) {
		820	$self->start_read
		821	if $self->{on_read} \|\| @{ $self->{_queue} };
673	}	822	}
674	}	823	}
675		824
676	=item $handle->on_read ($cb)	825	=item $handle->on_read ($cb)
677		826
…		…
683		832
684	sub on_read {	833	sub on_read {
685	my ($self, $cb) = @_;	834	my ($self, $cb) = @_;
686		835
687	$self->{on_read} = $cb;	836	$self->{on_read} = $cb;
		837	$self->_drain_rbuf if $cb && !$self->{_in_drain};
688	}	838	}
689		839
690	=item $handle->rbuf	840	=item $handle->rbuf
691		841
692	Returns the read buffer (as a modifiable lvalue).	842	Returns the read buffer (as a modifiable lvalue).
…		…
741	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read")	891	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read")
742	->($self, $cb, @_);	892	->($self, $cb, @_);
743	}	893	}
744		894
745	push @{ $self->{_queue} }, $cb;	895	push @{ $self->{_queue} }, $cb;
746	$self->_drain_rbuf;	896	$self->_drain_rbuf unless $self->{_in_drain};
747	}	897	}
748		898
749	sub unshift_read {	899	sub unshift_read {
750	my $self = shift;	900	my $self = shift;
751	my $cb = pop;	901	my $cb = pop;
…		…
757	->($self, $cb, @_);	907	->($self, $cb, @_);
758	}	908	}
759		909
760		910
761	unshift @{ $self->{_queue} }, $cb;	911	unshift @{ $self->{_queue} }, $cb;
762	$self->_drain_rbuf;	912	$self->_drain_rbuf unless $self->{_in_drain};
763	}	913	}
764		914
765	=item $handle->push_read (type => @args, $cb)	915	=item $handle->push_read (type => @args, $cb)
766		916
767	=item $handle->unshift_read (type => @args, $cb)	917	=item $handle->unshift_read (type => @args, $cb)
…		…
797	$cb->($_[0], substr $_[0]{rbuf}, 0, $len, "");	947	$cb->($_[0], substr $_[0]{rbuf}, 0, $len, "");
798	1	948	1
799	}	949	}
800	};	950	};
801		951
802	# compatibility with older API
803	sub push_read_chunk {
804	$_[0]->push_read (chunk => $_[1], $_[2]);
805	}
806
807	sub unshift_read_chunk {
808	$_[0]->unshift_read (chunk => $_[1], $_[2]);
809	}
810
811	=item line => [$eol, ]$cb->($handle, $line, $eol)	952	=item line => [$eol, ]$cb->($handle, $line, $eol)
812		953
813	The callback will be called only once a full line (including the end of	954	The callback will be called only once a full line (including the end of
814	line marker, C<$eol>) has been read. This line (excluding the end of line	955	line marker, C<$eol>) has been read. This line (excluding the end of line
815	marker) will be passed to the callback as second argument (C<$line>), and	956	marker) will be passed to the callback as second argument (C<$line>), and
…		…
830	=cut	971	=cut
831		972
832	register_read_type line => sub {	973	register_read_type line => sub {
833	my ($self, $cb, $eol) = @_;	974	my ($self, $cb, $eol) = @_;
834		975
835	$eol = qr\|(\015?\012)\| if @_ < 3;	976	if (@_ < 3) {
836	$eol = quotemeta $eol unless ref $eol;	977	# this is more than twice as fast as the generic code below
837	$eol = qr\|^(.*?)($eol)\|s;
838
839	sub {	978	sub {
840	$_[0]{rbuf} =~ s/$eol// or return;	979	$_[0]{rbuf} =~ s/^([^\015\012]*)(\015?\012)// or return;
841		980
842	$cb->($_[0], $1, $2);	981	$cb->($_[0], $1, $2);
843	1
844	}
845	};
846
847	# compatibility with older API
848	sub push_read_line {
849	my $self = shift;
850	$self->push_read (line => @_);
851	}
852
853	sub unshift_read_line {
854	my $self = shift;
855	$self->unshift_read (line => @_);
856	}
857
858	=item netstring => $cb->($handle, $string)
859
860	A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement).
861
862	Throws an error with C<$!> set to EBADMSG on format violations.
863
864	=cut
865
866	register_read_type netstring => sub {
867	my ($self, $cb) = @_;
868
869	sub {
870	unless ($_[0]{rbuf} =~ s/^(0\|[1-9][0-9]*)://) {
871	if ($_[0]{rbuf} =~ /[^0-9]/) {
872	$! = &Errno::EBADMSG;
873	$self->error;
874	}	982	1
875	return;
876	}	983	}
		984	} else {
		985	$eol = quotemeta $eol unless ref $eol;
		986	$eol = qr\|^(.*?)($eol)\|s;
877		987
878	my $len = $1;	988	sub {
		989	$_[0]{rbuf} =~ s/$eol// or return;
879		990
880	$self->unshift_read (chunk => $len, sub {	991	$cb->($_[0], $1, $2);
881	my $string = $_[1];
882	$_[0]->unshift_read (chunk => 1, sub {
883	if ($_[1] eq ",") {
884	$cb->($_[0], $string);
885	} else {
886	$! = &Errno::EBADMSG;
887	$self->error;
888	}
889	});	992	1
890	});	993	}
891
892	1
893	}	994	}
894	};	995	};
895		996
896	=item regex => $accept[, $reject[, $skip], $cb->($handle, $data)	997	=item regex => $accept[, $reject[, $skip], $cb->($handle, $data)
897		998
…		…
949	return 1;	1050	return 1;
950	}	1051	}
951		1052
952	# reject	1053	# reject
953	if ($reject && $$rbuf =~ $reject) {	1054	if ($reject && $$rbuf =~ $reject) {
954	$! = &Errno::EBADMSG;	1055	$self->_error (&Errno::EBADMSG);
955	$self->error;
956	}	1056	}
957		1057
958	# skip	1058	# skip
959	if ($skip && $$rbuf =~ $skip) {	1059	if ($skip && $$rbuf =~ $skip) {
960	$data .= substr $$rbuf, 0, $+[0], "";	1060	$data .= substr $$rbuf, 0, $+[0], "";
…		…
962		1062
963	()	1063	()
964	}	1064	}
965	};	1065	};
966		1066
		1067	=item netstring => $cb->($handle, $string)
		1068
		1069	A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement).
		1070
		1071	Throws an error with C<$!> set to EBADMSG on format violations.
		1072
		1073	=cut
		1074
		1075	register_read_type netstring => sub {
		1076	my ($self, $cb) = @_;
		1077
		1078	sub {
		1079	unless ($_[0]{rbuf} =~ s/^(0\|[1-9][0-9]*)://) {
		1080	if ($_[0]{rbuf} =~ /[^0-9]/) {
		1081	$self->_error (&Errno::EBADMSG);
		1082	}
		1083	return;
		1084	}
		1085
		1086	my $len = $1;
		1087
		1088	$self->unshift_read (chunk => $len, sub {
		1089	my $string = $_[1];
		1090	$_[0]->unshift_read (chunk => 1, sub {
		1091	if ($_[1] eq ",") {
		1092	$cb->($_[0], $string);
		1093	} else {
		1094	$self->_error (&Errno::EBADMSG);
		1095	}
		1096	});
		1097	});
		1098
		1099	1
		1100	}
		1101	};
		1102
		1103	=item packstring => $format, $cb->($handle, $string)
		1104
		1105	An octet string prefixed with an encoded length. The encoding C<$format>
		1106	uses the same format as a Perl C<pack> format, but must specify a single
		1107	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an
		1108	optional C<!>, C<< < >> or C<< > >> modifier).
		1109
		1110	For example, DNS over TCP uses a prefix of C<n> (2 octet network order),
		1111	EPP uses a prefix of C<N> (4 octtes).
		1112
		1113	Example: read a block of data prefixed by its length in BER-encoded
		1114	format (very efficient).
		1115
		1116	$handle->push_read (packstring => "w", sub {
		1117	my ($handle, $data) = @_;
		1118	});
		1119
		1120	=cut
		1121
		1122	register_read_type packstring => sub {
		1123	my ($self, $cb, $format) = @_;
		1124
		1125	sub {
		1126	# when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method
		1127	defined (my $len = eval { unpack $format, $_[0]{rbuf} })
		1128	or return;
		1129
		1130	$format = length pack $format, $len;
		1131
		1132	# bypass unshift if we already have the remaining chunk
		1133	if ($format + $len <= length $_[0]{rbuf}) {
		1134	my $data = substr $_[0]{rbuf}, $format, $len;
		1135	substr $_[0]{rbuf}, 0, $format + $len, "";
		1136	$cb->($_[0], $data);
		1137	} else {
		1138	# remove prefix
		1139	substr $_[0]{rbuf}, 0, $format, "";
		1140
		1141	# read remaining chunk
		1142	$_[0]->unshift_read (chunk => $len, $cb);
		1143	}
		1144
		1145	1
		1146	}
		1147	};
		1148
967	=item json => $cb->($handle, $hash_or_arrayref)	1149	=item json => $cb->($handle, $hash_or_arrayref)
968		1150
969	Reads a JSON object or array, decodes it and passes it to the callback.	1151	Reads a JSON object or array, decodes it and passes it to the
		1152	callback. When a parse error occurs, an C<EBADMSG> error will be raised.
970		1153
971	If a C<json> object was passed to the constructor, then that will be used	1154	If a C<json> object was passed to the constructor, then that will be used
972	for the final decode, otherwise it will create a JSON coder expecting UTF-8.	1155	for the final decode, otherwise it will create a JSON coder expecting UTF-8.
973		1156
974	This read type uses the incremental parser available with JSON version	1157	This read type uses the incremental parser available with JSON version
…		…
981	the C<json> write type description, above, for an actual example.	1164	the C<json> write type description, above, for an actual example.
982		1165
983	=cut	1166	=cut
984		1167
985	register_read_type json => sub {	1168	register_read_type json => sub {
986	my ($self, $cb, $accept, $reject, $skip) = @_;	1169	my ($self, $cb) = @_;
987		1170
988	require JSON;	1171	require JSON;
989		1172
990	my $data;	1173	my $data;
991	my $rbuf = \$self->{rbuf};	1174	my $rbuf = \$self->{rbuf};
992		1175
993	my $json = $self->{json} \|\|= JSON->new->utf8;	1176	my $json = $self->{json} \|\|= JSON->new->utf8;
994		1177
995	sub {	1178	sub {
996	my $ref = $json->incr_parse ($self->{rbuf});	1179	my $ref = eval { $json->incr_parse ($self->{rbuf}) };
997		1180
998	if ($ref) {	1181	if ($ref) {
999	$self->{rbuf} = $json->incr_text;	1182	$self->{rbuf} = $json->incr_text;
1000	$json->incr_text = "";	1183	$json->incr_text = "";
1001	$cb->($self, $ref);	1184	$cb->($self, $ref);
1002		1185
1003	1	1186	1
		1187	} elsif ($@) {
		1188	# error case
		1189	$json->incr_skip;
		1190
		1191	$self->{rbuf} = $json->incr_text;
		1192	$json->incr_text = "";
		1193
		1194	$self->_error (&Errno::EBADMSG);
		1195
		1196	()
1004	} else {	1197	} else {
1005	$self->{rbuf} = "";	1198	$self->{rbuf} = "";
		1199
1006	()	1200	()
1007	}	1201	}
		1202	}
		1203	};
		1204
		1205	=item storable => $cb->($handle, $ref)
		1206
		1207	Deserialises a L<Storable> frozen representation as written by the
		1208	C<storable> write type (BER-encoded length prefix followed by nfreeze'd
		1209	data).
		1210
		1211	Raises C<EBADMSG> error if the data could not be decoded.
		1212
		1213	=cut
		1214
		1215	register_read_type storable => sub {
		1216	my ($self, $cb) = @_;
		1217
		1218	require Storable;
		1219
		1220	sub {
		1221	# when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method
		1222	defined (my $len = eval { unpack "w", $_[0]{rbuf} })
		1223	or return;
		1224
		1225	my $format = length pack "w", $len;
		1226
		1227	# bypass unshift if we already have the remaining chunk
		1228	if ($format + $len <= length $_[0]{rbuf}) {
		1229	my $data = substr $_[0]{rbuf}, $format, $len;
		1230	substr $_[0]{rbuf}, 0, $format + $len, "";
		1231	$cb->($_[0], Storable::thaw ($data));
		1232	} else {
		1233	# remove prefix
		1234	substr $_[0]{rbuf}, 0, $format, "";
		1235
		1236	# read remaining chunk
		1237	$_[0]->unshift_read (chunk => $len, sub {
		1238	if (my $ref = eval { Storable::thaw ($_[1]) }) {
		1239	$cb->($_[0], $ref);
		1240	} else {
		1241	$self->_error (&Errno::EBADMSG);
		1242	}
		1243	});
		1244	}
		1245
		1246	1
1008	}	1247	}
1009	};	1248	};
1010		1249
1011	=back	1250	=back
1012		1251
…		…
1033	=item $handle->stop_read	1272	=item $handle->stop_read
1034		1273
1035	=item $handle->start_read	1274	=item $handle->start_read
1036		1275
1037	In rare cases you actually do not want to read anything from the	1276	In rare cases you actually do not want to read anything from the
1038	socket. In this case you can call C<stop_read>. Neither C<on_read> no	1277	socket. In this case you can call C<stop_read>. Neither C<on_read> nor
1039	any queued callbacks will be executed then. To start reading again, call	1278	any queued callbacks will be executed then. To start reading again, call
1040	C<start_read>.	1279	C<start_read>.
1041		1280
		1281	Note that AnyEvent::Handle will automatically C<start_read> for you when
		1282	you change the C<on_read> callback or push/unshift a read callback, and it
		1283	will automatically C<stop_read> for you when neither C<on_read> is set nor
		1284	there are any read requests in the queue.
		1285
		1286	These methods will have no effect when in TLS mode (as TLS doesn't support
		1287	half-duplex connections).
		1288
1042	=cut	1289	=cut
1043		1290
1044	sub stop_read {	1291	sub stop_read {
1045	my ($self) = @_;	1292	my ($self) = @_;
1046		1293
1047	delete $self->{_rw};	1294	delete $self->{_rw} unless $self->{tls};
1048	}	1295	}
1049		1296
1050	sub start_read {	1297	sub start_read {
1051	my ($self) = @_;	1298	my ($self) = @_;
1052		1299
1053	unless ($self->{_rw} \|\| $self->{_eof}) {	1300	unless ($self->{_rw} \|\| $self->{_eof}) {
1054	Scalar::Util::weaken $self;	1301	Scalar::Util::weaken $self;
1055		1302
1056	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {	1303	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {
1057	my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf};	1304	my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});
1058	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} \|\| 8192, length $$rbuf;	1305	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} \|\| 8192, length $$rbuf;
1059		1306
1060	if ($len > 0) {	1307	if ($len > 0) {
1061	$self->{_activity} = time;	1308	$self->{_activity} = AnyEvent->now;
1062		1309
1063	$self->{filter_r}	1310	if ($self->{tls}) {
1064	? $self->{filter_r}->($self, $rbuf)	1311	Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);
1065	: $self->_drain_rbuf;	1312
		1313	&_dotls ($self);
		1314	} else {
		1315	$self->_drain_rbuf unless $self->{_in_drain};
		1316	}
1066		1317
1067	} elsif (defined $len) {	1318	} elsif (defined $len) {
1068	delete $self->{_rw};	1319	delete $self->{_rw};
1069	delete $self->{_ww};
1070	delete $self->{_tw};
1071	$self->{_eof} = 1;	1320	$self->{_eof} = 1;
1072	$self->_drain_rbuf;	1321	$self->_drain_rbuf unless $self->{_in_drain};
1073		1322
1074	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	1323	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
1075	return $self->error;	1324	return $self->_error ($!, 1);
1076	}	1325	}
1077	});	1326	});
1078	}	1327	}
1079	}	1328	}
1080		1329
		1330	# poll the write BIO and send the data if applicable
1081	sub _dotls {	1331	sub _dotls {
1082	my ($self) = @_;	1332	my ($self) = @_;
1083		1333
		1334	my $tmp;
		1335
1084	if (length $self->{_tls_wbuf}) {	1336	if (length $self->{_tls_wbuf}) {
1085	while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {	1337	while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {
1086	substr $self->{_tls_wbuf}, 0, $len, "";	1338	substr $self->{_tls_wbuf}, 0, $tmp, "";
1087	}	1339	}
1088	}	1340	}
1089		1341
		1342	while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) {
		1343	unless (length $tmp) {
		1344	# let's treat SSL-eof as we treat normal EOF
		1345	delete $self->{_rw};
		1346	$self->{_eof} = 1;
		1347	&_freetls;
		1348	}
		1349
		1350	$self->{tls_rbuf} .= $tmp;#d#
		1351	$self->_drain_rbuf unless $self->{_in_drain};
		1352	$self->{tls} or return; # tls session might have gone away in callback
		1353	}
		1354
		1355	$tmp = Net::SSLeay::get_error ($self->{tls}, -1);
		1356
		1357	if ($tmp != Net::SSLeay::ERROR_WANT_READ ()) {
		1358	if ($tmp == Net::SSLeay::ERROR_SYSCALL ()) {
		1359	return $self->_error ($!, 1);
		1360	} elsif ($tmp == Net::SSLeay::ERROR_SSL ()) {
		1361	return $self->_error (&Errno::EIO, 1);
		1362	}
		1363
		1364	# all other errors are fine for our purposes
		1365	}
		1366
1090	if (defined (my $buf = Net::SSLeay::BIO_read ($self->{_wbio}))) {	1367	while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) {
1091	$self->{wbuf} .= $buf;	1368	$self->{wbuf} .= $tmp;
1092	$self->_drain_wbuf;	1369	$self->_drain_wbuf;
1093	}
1094
1095	while (defined (my $buf = Net::SSLeay::read ($self->{tls}))) {
1096	$self->{rbuf} .= $buf;
1097	$self->_drain_rbuf;
1098	}
1099
1100	my $err = Net::SSLeay::get_error ($self->{tls}, -1);
1101
1102	if ($err!= Net::SSLeay::ERROR_WANT_READ ()) {
1103	if ($err == Net::SSLeay::ERROR_SYSCALL ()) {
1104	$self->error;
1105	} elsif ($err == Net::SSLeay::ERROR_SSL ()) {
1106	$! = &Errno::EIO;
1107	$self->error;
1108	}
1109
1110	# all others are fine for our purposes
1111	}	1370	}
1112	}	1371	}
1113		1372
1114	=item $handle->starttls ($tls[, $tls_ctx])	1373	=item $handle->starttls ($tls[, $tls_ctx])
1115		1374
…		…
1125		1384
1126	The TLS connection object will end up in C<< $handle->{tls} >> after this	1385	The TLS connection object will end up in C<< $handle->{tls} >> after this
1127	call and can be used or changed to your liking. Note that the handshake	1386	call and can be used or changed to your liking. Note that the handshake
1128	might have already started when this function returns.	1387	might have already started when this function returns.
1129		1388
1130	=cut	1389	If it an error to start a TLS handshake more than once per
		1390	AnyEvent::Handle object (this is due to bugs in OpenSSL).
1131		1391
1132	# TODO: maybe document...	1392	=cut
		1393
1133	sub starttls {	1394	sub starttls {
1134	my ($self, $ssl, $ctx) = @_;	1395	my ($self, $ssl, $ctx) = @_;
1135		1396
1136	$self->stoptls;	1397	require Net::SSLeay;
1137		1398
		1399	Carp::croak "it is an error to call starttls more than once on an AnyEvent::Handle object"
		1400	if $self->{tls};
		1401
1138	if ($ssl eq "accept") {	1402	if ($ssl eq "accept") {
1139	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());	1403	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());
1140	Net::SSLeay::set_accept_state ($ssl);	1404	Net::SSLeay::set_accept_state ($ssl);
1141	} elsif ($ssl eq "connect") {	1405	} elsif ($ssl eq "connect") {
1142	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());	1406	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());
…		…
1148	# basically, this is deep magic (because SSL_read should have the same issues)	1412	# basically, this is deep magic (because SSL_read should have the same issues)
1149	# but the openssl maintainers basically said: "trust us, it just works".	1413	# but the openssl maintainers basically said: "trust us, it just works".
1150	# (unfortunately, we have to hardcode constants because the abysmally misdesigned	1414	# (unfortunately, we have to hardcode constants because the abysmally misdesigned
1151	# and mismaintained ssleay-module doesn't even offer them).	1415	# and mismaintained ssleay-module doesn't even offer them).
1152	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html	1416	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html
		1417	#
		1418	# in short: this is a mess.
		1419	#
		1420	# note that we do not try to keep the length constant between writes as we are required to do.
		1421	# we assume that most (but not all) of this insanity only applies to non-blocking cases,
		1422	# and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to
		1423	# have identity issues in that area.
1153	Net::SSLeay::CTX_set_mode ($self->{tls},	1424	Net::SSLeay::CTX_set_mode ($self->{tls},
1154	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } \|\| 1)	1425	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } \|\| 1)
1155	\| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } \|\| 2));	1426	\| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } \|\| 2));
1156		1427
1157	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1428	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1158	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1429	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1159		1430
1160	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});	1431	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});
1161		1432
1162	$self->{filter_w} = sub {	1433	&_dotls; # need to trigger the initial handshake
1163	$_[0]{_tls_wbuf} .= ${$_[1]};	1434	$self->start_read; # make sure we actually do read
1164	&_dotls;
1165	};
1166	$self->{filter_r} = sub {
1167	Net::SSLeay::BIO_write ($_[0]{_rbio}, ${$_[1]});
1168	&_dotls;
1169	};
1170	}	1435	}
1171		1436
1172	=item $handle->stoptls	1437	=item $handle->stoptls
1173		1438
1174	Destroys the SSL connection, if any. Partial read or write data will be	1439	Shuts down the SSL connection - this makes a proper EOF handshake by
1175	lost.	1440	sending a close notify to the other side, but since OpenSSL doesn't
		1441	support non-blocking shut downs, it is not possible to re-use the stream
		1442	afterwards.
1176		1443
1177	=cut	1444	=cut
1178		1445
1179	sub stoptls {	1446	sub stoptls {
1180	my ($self) = @_;	1447	my ($self) = @_;
1181		1448
		1449	if ($self->{tls}) {
		1450	Net::SSLeay::shutdown ($self->{tls});
		1451
		1452	&_dotls;
		1453
		1454	# we don't give a shit. no, we do, but we can't. no...
		1455	# we, we... have to use openssl :/
		1456	&_freetls;
		1457	}
		1458	}
		1459
		1460	sub _freetls {
		1461	my ($self) = @_;
		1462
		1463	return unless $self->{tls};
		1464
1182	Net::SSLeay::free (delete $self->{tls}) if $self->{tls};	1465	Net::SSLeay::free (delete $self->{tls});
1183		1466
1184	delete $self->{_rbio};	1467	delete @$self{qw(_rbio _wbio _tls_wbuf)};
1185	delete $self->{_wbio};
1186	delete $self->{_tls_wbuf};
1187	delete $self->{filter_r};
1188	delete $self->{filter_w};
1189	}	1468	}
1190		1469
1191	sub DESTROY {	1470	sub DESTROY {
1192	my $self = shift;	1471	my $self = shift;
1193		1472
1194	$self->stoptls;	1473	&_freetls;
		1474
		1475	my $linger = exists $self->{linger} ? $self->{linger} : 3600;
		1476
		1477	if ($linger && length $self->{wbuf}) {
		1478	my $fh = delete $self->{fh};
		1479	my $wbuf = delete $self->{wbuf};
		1480
		1481	my @linger;
		1482
		1483	push @linger, AnyEvent->io (fh => $fh, poll => "w", cb => sub {
		1484	my $len = syswrite $fh, $wbuf, length $wbuf;
		1485
		1486	if ($len > 0) {
		1487	substr $wbuf, 0, $len, "";
		1488	} else {
		1489	@linger = (); # end
		1490	}
		1491	});
		1492	push @linger, AnyEvent->timer (after => $linger, cb => sub {
		1493	@linger = ();
		1494	});
		1495	}
		1496	}
		1497
		1498	=item $handle->destroy
		1499
		1500	Shuts down the handle object as much as possible - this call ensures that
		1501	no further callbacks will be invoked and resources will be freed as much
		1502	as possible. You must not call any methods on the object afterwards.
		1503
		1504	Normally, you can just "forget" any references to an AnyEvent::Handle
		1505	object and it will simply shut down. This works in fatal error and EOF
		1506	callbacks, as well as code outside. It does I<NOT> work in a read or write
		1507	callback, so when you want to destroy the AnyEvent::Handle object from
		1508	within such an callback. You I<MUST> call C<< ->destroy >> explicitly in
		1509	that case.
		1510
		1511	The handle might still linger in the background and write out remaining
		1512	data, as specified by the C<linger> option, however.
		1513
		1514	=cut
		1515
		1516	sub destroy {
		1517	my ($self) = @_;
		1518
		1519	$self->DESTROY;
		1520	%$self = ();
1195	}	1521	}
1196		1522
1197	=item AnyEvent::Handle::TLS_CTX	1523	=item AnyEvent::Handle::TLS_CTX
1198		1524
1199	This function creates and returns the Net::SSLeay::CTX object used by	1525	This function creates and returns the Net::SSLeay::CTX object used by
…		…
1229	}	1555	}
1230	}	1556	}
1231		1557
1232	=back	1558	=back
1233		1559
		1560
		1561	=head1 NONFREQUENTLY ASKED QUESTIONS
		1562
		1563	=over 4
		1564
		1565	=item I C<undef> the AnyEvent::Handle reference inside my callback and
		1566	still get further invocations!
		1567
		1568	That's because AnyEvent::Handle keeps a reference to itself when handling
		1569	read or write callbacks.
		1570
		1571	It is only safe to "forget" the reference inside EOF or error callbacks,
		1572	from within all other callbacks, you need to explicitly call the C<<
		1573	->destroy >> method.
		1574
		1575	=item I get different callback invocations in TLS mode/Why can't I pause
		1576	reading?
		1577
		1578	Unlike, say, TCP, TLS connections do not consist of two independent
		1579	communication channels, one for each direction. Or put differently. The
		1580	read and write directions are not independent of each other: you cannot
		1581	write data unless you are also prepared to read, and vice versa.
		1582
		1583	This can mean than, in TLS mode, you might get C<on_error> or C<on_eof>
		1584	callback invocations when you are not expecting any read data - the reason
		1585	is that AnyEvent::Handle always reads in TLS mode.
		1586
		1587	During the connection, you have to make sure that you always have a
		1588	non-empty read-queue, or an C<on_read> watcher. At the end of the
		1589	connection (or when you no longer want to use it) you can call the
		1590	C<destroy> method.
		1591
		1592	=item How do I read data until the other side closes the connection?
		1593
		1594	If you just want to read your data into a perl scalar, the easiest way
		1595	to achieve this is by setting an C<on_read> callback that does nothing,
		1596	clearing the C<on_eof> callback and in the C<on_error> callback, the data
		1597	will be in C<$_[0]{rbuf}>:
		1598
		1599	$handle->on_read (sub { });
		1600	$handle->on_eof (undef);
		1601	$handle->on_error (sub {
		1602	my $data = delete $_[0]{rbuf};
		1603	undef $handle;
		1604	});
		1605
		1606	The reason to use C<on_error> is that TCP connections, due to latencies
		1607	and packets loss, might get closed quite violently with an error, when in
		1608	fact, all data has been received.
		1609
		1610	It is usually better to use acknowledgements when transferring data,
		1611	to make sure the other side hasn't just died and you got the data
		1612	intact. This is also one reason why so many internet protocols have an
		1613	explicit QUIT command.
		1614
		1615	=item I don't want to destroy the handle too early - how do I wait until
		1616	all data has been written?
		1617
		1618	After writing your last bits of data, set the C<on_drain> callback
		1619	and destroy the handle in there - with the default setting of
		1620	C<low_water_mark> this will be called precisely when all data has been
		1621	written to the socket:
		1622
		1623	$handle->push_write (...);
		1624	$handle->on_drain (sub {
		1625	warn "all data submitted to the kernel\n";
		1626	undef $handle;
		1627	});
		1628
		1629	=back
		1630
		1631
1234	=head1 SUBCLASSING AnyEvent::Handle	1632	=head1 SUBCLASSING AnyEvent::Handle
1235		1633
1236	In many cases, you might want to subclass AnyEvent::Handle.	1634	In many cases, you might want to subclass AnyEvent::Handle.
1237		1635
1238	To make this easier, a given version of AnyEvent::Handle uses these	1636	To make this easier, a given version of AnyEvent::Handle uses these
…		…
1241	=over 4	1639	=over 4
1242		1640
1243	=item * all constructor arguments become object members.	1641	=item * all constructor arguments become object members.
1244		1642
1245	At least initially, when you pass a C<tls>-argument to the constructor it	1643	At least initially, when you pass a C<tls>-argument to the constructor it
1246	will end up in C<< $handle->{tls} >>. Those members might be changes or	1644	will end up in C<< $handle->{tls} >>. Those members might be changed or
1247	mutated later on (for example C<tls> will hold the TLS connection object).	1645	mutated later on (for example C<tls> will hold the TLS connection object).
1248		1646
1249	=item * other object member names are prefixed with an C<_>.	1647	=item * other object member names are prefixed with an C<_>.
1250		1648
1251	All object members not explicitly documented (internal use) are prefixed	1649	All object members not explicitly documented (internal use) are prefixed

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Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents): Revision 1.43 by root, Wed May 28 23:57:38 2008 UTC vs. Revision 1.115 by root, Tue Feb 10 13:58:49 2009 UTC

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Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.43 by root, Wed May 28 23:57:38 2008 UTC vs.
Revision 1.115 by root, Tue Feb 10 13:58:49 2009 UTC