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

Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.56 by root, Wed Jun 4 09:55:16 2008 UTC vs.
Revision 1.132 by elmex, Thu Jul 2 22:25:13 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 ();
14		14
15	AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent	15	AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent
16		16
17	=cut	17	=cut
18		18
19	our $VERSION = 4.12;	19	our $VERSION = 4.45;
20		20
21	=head1 SYNOPSIS	21	=head1 SYNOPSIS
22		22
23	use AnyEvent;	23	use AnyEvent;
24	use AnyEvent::Handle;	24	use AnyEvent::Handle;
…		…
27		27
28	my $handle =	28	my $handle =
29	AnyEvent::Handle->new (	29	AnyEvent::Handle->new (
30	fh => \*STDIN,	30	fh => \*STDIN,
31	on_eof => sub {	31	on_eof => sub {
32	$cv->broadcast;	32	$cv->send;
33	},	33	},
34	);	34	);
35		35
36	# send some request line	36	# send some request line
37	$handle->push_write ("getinfo\015\012");	37	$handle->push_write ("getinfo\015\012");
…		…
49		49
50	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
51	filehandles. For utility functions for doing non-blocking connects and accepts	51	filehandles. For utility functions for doing non-blocking connects and accepts
52	on sockets see L<AnyEvent::Util>.	52	on sockets see L<AnyEvent::Util>.
53		53
		54	The L<AnyEvent::Intro> tutorial contains some well-documented
		55	AnyEvent::Handle examples.
		56
54	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
55	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
56	treatment of characters applies to this module as well.	59	treatment of characters applies to this module as well.
57		60
58	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
…		…
60		63
61	=head1 METHODS	64	=head1 METHODS
62		65
63	=over 4	66	=over 4
64		67
65	=item B<new (%args)>	68	=item $handle = B<new> AnyEvent::TLS fh => $filehandle, key => value...
66		69
67	The constructor supports these arguments (all as key => value pairs).	70	The constructor supports these arguments (all as C<< key => value >> pairs).
68		71
69	=over 4	72	=over 4
70		73
71	=item fh => $filehandle [MANDATORY]	74	=item fh => $filehandle [MANDATORY]
72		75
73	The filehandle this L<AnyEvent::Handle> object will operate on.	76	The filehandle this L<AnyEvent::Handle> object will operate on.
74		77
75	NOTE: The filehandle will be set to non-blocking (using	78	NOTE: The filehandle will be set to non-blocking mode (using
76	AnyEvent::Util::fh_nonblocking).	79	C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in
		80	that mode.
77		81
78	=item on_eof => $cb->($handle)	82	=item on_eof => $cb->($handle)
79		83
80	Set the callback to be called when an end-of-file condition is detcted,	84	Set the callback to be called when an end-of-file condition is detected,
81	i.e. in the case of a socket, when the other side has closed the	85	i.e. in the case of a socket, when the other side has closed the
82	connection cleanly.	86	connection cleanly.
83		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
84	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,
85	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
86	waiting for data.	95	waiting for data.
		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>.
87		99
88	=item on_error => $cb->($handle, $fatal)	100	=item on_error => $cb->($handle, $fatal)
89		101
90	This is the error callback, which is called when, well, some error	102	This is the error callback, which is called when, well, some error
91	occured, such as not being able to resolve the hostname, failure to	103	occured, such as not being able to resolve the hostname, failure to
92	connect or a read error.	104	connect or a read error.
93		105
94	Some errors are fatal (which is indicated by C<$fatal> being true). On	106	Some errors are fatal (which is indicated by C<$fatal> being true). On
95	fatal errors the handle object will be shut down and will not be	107	fatal errors the handle object will be shut down and will not be usable
		108	(but you are free to look at the current C<< ->rbuf >>). Examples of fatal
		109	errors are an EOF condition with active (but unsatisifable) read watchers
		110	(C<EPIPE>) or I/O errors.
		111
96	usable. Non-fatal errors can be retried by simply returning, but it is	112	Non-fatal errors can be retried by simply returning, but it is recommended
97	recommended to simply ignore this parameter and instead abondon the handle	113	to simply ignore this parameter and instead abondon the handle object
98	object when this callback is invoked.	114	when this callback is invoked. Examples of non-fatal errors are timeouts
		115	C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>).
99		116
100	On callback entrance, the value of C<$!> contains the operating system	117	On callback entrance, the value of C<$!> contains the operating system
101	error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>).	118	error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>).
102		119
103	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
…		…
105	C<croak>.	122	C<croak>.
106		123
107	=item on_read => $cb->($handle)	124	=item on_read => $cb->($handle)
108		125
109	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
110	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).
111		130
112	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 >>
113	method or access the C<$handle->{rbuf}> member directly.	132	method or access the C<$handle->{rbuf}> member directly. Note that you
		133	must not enlarge or modify the read buffer, you can only remove data at
		134	the beginning from it.
114		135
115	When an EOF condition is detected then AnyEvent::Handle will first try to	136	When an EOF condition is detected then AnyEvent::Handle will first try to
116	feed all the remaining data to the queued callbacks and C<on_read> before	137	feed all the remaining data to the queued callbacks and C<on_read> before
117	calling the C<on_eof> callback. If no progress can be made, then a fatal	138	calling the C<on_eof> callback. If no progress can be made, then a fatal
118	error will be raised (with C<$!> set to C<EPIPE>).	139	error will be raised (with C<$!> set to C<EPIPE>).
…		…
122	This sets the callback that is called when the write buffer becomes empty	143	This sets the callback that is called when the write buffer becomes empty
123	(or when the callback is set and the buffer is empty already).	144	(or when the callback is set and the buffer is empty already).
124		145
125	To append to the write buffer, use the C<< ->push_write >> method.	146	To append to the write buffer, use the C<< ->push_write >> method.
126		147
		148	This callback is useful when you don't want to put all of your write data
		149	into the queue at once, for example, when you want to write the contents
		150	of some file to the socket you might not want to read the whole file into
		151	memory and push it into the queue, but instead only read more data from
		152	the file when the write queue becomes empty.
		153
127	=item timeout => $fractional_seconds	154	=item timeout => $fractional_seconds
128		155
129	If non-zero, then this enables an "inactivity" timeout: whenever this many	156	If non-zero, then this enables an "inactivity" timeout: whenever this many
130	seconds pass without a successful read or write on the underlying file	157	seconds pass without a successful read or write on the underlying file
131	handle, the C<on_timeout> callback will be invoked (and if that one is	158	handle, the C<on_timeout> callback will be invoked (and if that one is
132	missing, an C<ETIMEDOUT> error will be raised).	159	missing, a non-fatal C<ETIMEDOUT> error will be raised).
133		160
134	Note that timeout processing is also active when you currently do not have	161	Note that timeout processing is also active when you currently do not have
135	any outstanding read or write requests: If you plan to keep the connection	162	any outstanding read or write requests: If you plan to keep the connection
136	idle then you should disable the timout temporarily or ignore the timeout	163	idle then you should disable the timout temporarily or ignore the timeout
137	in the C<on_timeout> callback.	164	in the C<on_timeout> callback, in which case AnyEvent::Handle will simply
		165	restart the timeout.
138		166
139	Zero (the default) disables this timeout.	167	Zero (the default) disables this timeout.
140		168
141	=item on_timeout => $cb->($handle)	169	=item on_timeout => $cb->($handle)
142		170
…		…
146		174
147	=item rbuf_max => <bytes>	175	=item rbuf_max => <bytes>
148		176
149	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)	177	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)
150	when the read buffer ever (strictly) exceeds this size. This is useful to	178	when the read buffer ever (strictly) exceeds this size. This is useful to
151	avoid denial-of-service attacks.	179	avoid some forms of denial-of-service attacks.
152		180
153	For example, a server accepting connections from untrusted sources should	181	For example, a server accepting connections from untrusted sources should
154	be configured to accept only so-and-so much data that it cannot act on	182	be configured to accept only so-and-so much data that it cannot act on
155	(for example, when expecting a line, an attacker could send an unlimited	183	(for example, when expecting a line, an attacker could send an unlimited
156	amount of data without a callback ever being called as long as the line	184	amount of data without a callback ever being called as long as the line
157	isn't finished).	185	isn't finished).
158		186
		187	=item autocork => <boolean>
		188
		189	When disabled (the default), then C<push_write> will try to immediately
		190	write the data to the handle, if possible. This avoids having to register
		191	a write watcher and wait for the next event loop iteration, but can
		192	be inefficient if you write multiple small chunks (on the wire, this
		193	disadvantage is usually avoided by your kernel's nagle algorithm, see
		194	C<no_delay>, but this option can save costly syscalls).
		195
		196	When enabled, then writes will always be queued till the next event loop
		197	iteration. This is efficient when you do many small writes per iteration,
		198	but less efficient when you do a single write only per iteration (or when
		199	the write buffer often is full). It also increases write latency.
		200
		201	=item no_delay => <boolean>
		202
		203	When doing small writes on sockets, your operating system kernel might
		204	wait a bit for more data before actually sending it out. This is called
		205	the Nagle algorithm, and usually it is beneficial.
		206
		207	In some situations you want as low a delay as possible, which can be
		208	accomplishd by setting this option to a true value.
		209
		210	The default is your opertaing system's default behaviour (most likely
		211	enabled), this option explicitly enables or disables it, if possible.
		212
159	=item read_size => <bytes>	213	=item read_size => <bytes>
160		214
161	The default read block size (the amount of bytes this module will try to read	215	The default read block size (the amount of bytes this module will
162	during each (loop iteration). Default: C<8192>.	216	try to read during each loop iteration, which affects memory
		217	requirements). Default: C<8192>.
163		218
164	=item low_water_mark => <bytes>	219	=item low_water_mark => <bytes>
165		220
166	Sets the amount of bytes (default: C<0>) that make up an "empty" write	221	Sets the amount of bytes (default: C<0>) that make up an "empty" write
167	buffer: If the write reaches this size or gets even samller it is	222	buffer: If the write reaches this size or gets even samller it is
168	considered empty.	223	considered empty.
169		224
		225	Sometimes it can be beneficial (for performance reasons) to add data to
		226	the write buffer before it is fully drained, but this is a rare case, as
		227	the operating system kernel usually buffers data as well, so the default
		228	is good in almost all cases.
		229
		230	=item linger => <seconds>
		231
		232	If non-zero (default: C<3600>), then the destructor of the
		233	AnyEvent::Handle object will check whether there is still outstanding
		234	write data and will install a watcher that will write this data to the
		235	socket. No errors will be reported (this mostly matches how the operating
		236	system treats outstanding data at socket close time).
		237
		238	This will not work for partial TLS data that could not be encoded
		239	yet. This data will be lost. Calling the C<stoptls> method in time might
		240	help.
		241
		242	=item common_name => $string
		243
		244	The common name used by some verification methods (most notably SSL/TLS)
		245	associated with this connection. Usually this is the remote hostname used
		246	to connect, but can be almost anything.
		247
170	=item tls => "accept" \| "connect" \| Net::SSLeay::SSL object	248	=item tls => "accept" \| "connect" \| Net::SSLeay::SSL object
171		249
172	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
173	will start making tls handshake and will transparently encrypt/decrypt	251	AnyEvent will start a TLS handshake as soon as the conenction has been
174	data.	252	established and will transparently encrypt/decrypt data afterwards.
175		253
176	TLS mode requires Net::SSLeay to be installed (it will be loaded	254	TLS mode requires Net::SSLeay to be installed (it will be loaded
177	automatically when you try to create a TLS handle).	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.
178		258
179	For the TLS server side, use C<accept>, and for the TLS client side of a	259	Unlike TCP, TLS has a server and client side: for the TLS server side, use
180	connection, use C<connect> mode.	260	C<accept>, and for the TLS client side of a connection, use C<connect>
		261	mode.
181		262
182	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
183	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>
184	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
185	AnyEvent::Handle.	266	AnyEvent::Handle. Also, this module will take ownership of this connection
		267	object.
186		268
		269	At some future point, AnyEvent::Handle might switch to another TLS
		270	implementation, then the option to use your own session object will go
		271	away.
		272
		273	B<IMPORTANT:> since Net::SSLeay "objects" are really only integers,
		274	passing in the wrong integer will lead to certain crash. This most often
		275	happens when one uses a stylish C<< tls => 1 >> and is surprised about the
		276	segmentation fault.
		277
187	See the C<starttls> method if you need to start TLs negotiation later.	278	See the C<< ->starttls >> method for when need to start TLS negotiation later.
188		279
189	=item tls_ctx => $ssl_ctx	280	=item tls_ctx => $anyevent_tls
190		281
191	Use the given Net::SSLeay::CTX object to create the new TLS connection	282	Use the given C<AnyEvent::TLS> object to create the new TLS connection
192	(unless a connection object was specified directly). If this parameter is	283	(unless a connection object was specified directly). If this parameter is
193	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.	284	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.
194		285
		286	Instead of an object, you can also specify a hash reference with C<< key
		287	=> value >> pairs. Those will be passed to L<AnyEvent::TLS> to create a
		288	new TLS context object.
		289
195	=item json => JSON or JSON::XS object	290	=item json => JSON or JSON::XS object
196		291
197	This is the json coder object used by the C<json> read and write types.	292	This is the json coder object used by the C<json> read and write types.
198		293
199	If you don't supply it, then AnyEvent::Handle will create and use a	294	If you don't supply it, then AnyEvent::Handle will create and use a
200	suitable one, which will write and expect UTF-8 encoded JSON texts.	295	suitable one (on demand), which will write and expect UTF-8 encoded JSON
		296	texts.
201		297
202	Note that you are responsible to depend on the JSON module if you want to	298	Note that you are responsible to depend on the JSON module if you want to
203	use this functionality, as AnyEvent does not have a dependency itself.	299	use this functionality, as AnyEvent does not have a dependency itself.
204		300
205	=item filter_r => $cb
206
207	=item filter_w => $cb
208
209	These exist, but are undocumented at this time.
210
211	=back	301	=back
212		302
213	=cut	303	=cut
214		304
215	sub new {	305	sub new {
216	my $class = shift;	306	my $class = shift;
217
218	my $self = bless { @_ }, $class;	307	my $self = bless { @_ }, $class;
219		308
220	$self->{fh} or Carp::croak "mandatory argument fh is missing";	309	$self->{fh} or Carp::croak "mandatory argument fh is missing";
221		310
222	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;	311	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;
223
224	if ($self->{tls}) {
225	require Net::SSLeay;
226	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx});
227	}
228
229	# $self->on_eof (delete $self->{on_eof} ) if $self->{on_eof}; # nop
230	# $self->on_error (delete $self->{on_error}) if $self->{on_error}; # nop
231	# $self->on_read (delete $self->{on_read} ) if $self->{on_read}; # nop
232	$self->on_drain (delete $self->{on_drain}) if $self->{on_drain};
233		312
234	$self->{_activity} = AnyEvent->now;	313	$self->{_activity} = AnyEvent->now;
235	$self->_timeout;	314	$self->_timeout;
236		315
		316	$self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay};
		317
		318	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx})
		319	if $self->{tls};
		320
		321	$self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain};
		322
237	$self->start_read;	323	$self->start_read
		324	if $self->{on_read};
238		325
239	$self	326	$self->{fh} && $self
240	}	327	}
241		328
242	sub _shutdown {	329	sub _shutdown {
243	my ($self) = @_;	330	my ($self) = @_;
244		331
245	delete $self->{_tw};	332	delete @$self{qw(_tw _rw _ww fh wbuf on_read _queue)};
246	delete $self->{_rw};	333	$self->{_eof} = 1; # tell starttls et. al to stop trying
247	delete $self->{_ww};
248	delete $self->{fh};
249		334
250	$self->stoptls;	335	&_freetls;
251	}	336	}
252		337
253	sub _error {	338	sub _error {
254	my ($self, $errno, $fatal) = @_;	339	my ($self, $errno, $fatal) = @_;
255		340
…		…
258		343
259	$! = $errno;	344	$! = $errno;
260		345
261	if ($self->{on_error}) {	346	if ($self->{on_error}) {
262	$self->{on_error}($self, $fatal);	347	$self->{on_error}($self, $fatal);
263	} else {	348	} elsif ($self->{fh}) {
264	Carp::croak "AnyEvent::Handle uncaught error: $!";	349	Carp::croak "AnyEvent::Handle uncaught error: $!";
265	}	350	}
266	}	351	}
267		352
268	=item $fh = $handle->fh	353	=item $fh = $handle->fh
269		354
270	This method returns the file handle of the L<AnyEvent::Handle> object.	355	This method returns the file handle used to create the L<AnyEvent::Handle> object.
271		356
272	=cut	357	=cut
273		358
274	sub fh { $_[0]{fh} }	359	sub fh { $_[0]{fh} }
275		360
…		…
293	$_[0]{on_eof} = $_[1];	378	$_[0]{on_eof} = $_[1];
294	}	379	}
295		380
296	=item $handle->on_timeout ($cb)	381	=item $handle->on_timeout ($cb)
297		382
298	Replace the current C<on_timeout> callback, or disables the callback	383	Replace the current C<on_timeout> callback, or disables the callback (but
299	(but not the timeout) if C<$cb> = C<undef>. See C<timeout> constructor	384	not the timeout) if C<$cb> = C<undef>. See the C<timeout> constructor
300	argument.	385	argument and method.
301		386
302	=cut	387	=cut
303		388
304	sub on_timeout {	389	sub on_timeout {
305	$_[0]{on_timeout} = $_[1];	390	$_[0]{on_timeout} = $_[1];
		391	}
		392
		393	=item $handle->autocork ($boolean)
		394
		395	Enables or disables the current autocork behaviour (see C<autocork>
		396	constructor argument). Changes will only take effect on the next write.
		397
		398	=cut
		399
		400	sub autocork {
		401	$_[0]{autocork} = $_[1];
		402	}
		403
		404	=item $handle->no_delay ($boolean)
		405
		406	Enables or disables the C<no_delay> setting (see constructor argument of
		407	the same name for details).
		408
		409	=cut
		410
		411	sub no_delay {
		412	$_[0]{no_delay} = $_[1];
		413
		414	eval {
		415	local $SIG{__DIE__};
		416	setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1];
		417	};
306	}	418	}
307		419
308	#############################################################################	420	#############################################################################
309		421
310	=item $handle->timeout ($seconds)	422	=item $handle->timeout ($seconds)
…		…
388	my ($self, $cb) = @_;	500	my ($self, $cb) = @_;
389		501
390	$self->{on_drain} = $cb;	502	$self->{on_drain} = $cb;
391		503
392	$cb->($self)	504	$cb->($self)
393	if $cb && $self->{low_water_mark} >= length $self->{wbuf};	505	if $cb && $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf});
394	}	506	}
395		507
396	=item $handle->push_write ($data)	508	=item $handle->push_write ($data)
397		509
398	Queues the given scalar to be written. You can push as much data as you	510	Queues the given scalar to be written. You can push as much data as you
…		…
415	substr $self->{wbuf}, 0, $len, "";	527	substr $self->{wbuf}, 0, $len, "";
416		528
417	$self->{_activity} = AnyEvent->now;	529	$self->{_activity} = AnyEvent->now;
418		530
419	$self->{on_drain}($self)	531	$self->{on_drain}($self)
420	if $self->{low_water_mark} >= length $self->{wbuf}	532	if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf})
421	&& $self->{on_drain};	533	&& $self->{on_drain};
422		534
423	delete $self->{_ww} unless length $self->{wbuf};	535	delete $self->{_ww} unless length $self->{wbuf};
424	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	536	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
425	$self->_error ($!, 1);	537	$self->_error ($!, 1);
426	}	538	}
427	};	539	};
428		540
429	# try to write data immediately	541	# try to write data immediately
430	$cb->();	542	$cb->() unless $self->{autocork};
431		543
432	# if still data left in wbuf, we need to poll	544	# if still data left in wbuf, we need to poll
433	$self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb)	545	$self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb)
434	if length $self->{wbuf};	546	if length $self->{wbuf};
435	};	547	};
…		…
449		561
450	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")	562	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")
451	->($self, @_);	563	->($self, @_);
452	}	564	}
453		565
454	if ($self->{filter_w}) {	566	if ($self->{tls}) {
455	$self->{filter_w}($self, \$_[0]);	567	$self->{_tls_wbuf} .= $_[0];
		568
		569	&_dotls ($self);
456	} else {	570	} else {
457	$self->{wbuf} .= $_[0];	571	$self->{wbuf} .= $_[0];
458	$self->_drain_wbuf;	572	$self->_drain_wbuf;
459	}	573	}
460	}	574	}
…		…
477	=cut	591	=cut
478		592
479	register_write_type netstring => sub {	593	register_write_type netstring => sub {
480	my ($self, $string) = @_;	594	my ($self, $string) = @_;
481		595
482	sprintf "%d:%s,", (length $string), $string	596	(length $string) . ":$string,"
		597	};
		598
		599	=item packstring => $format, $data
		600
		601	An octet string prefixed with an encoded length. The encoding C<$format>
		602	uses the same format as a Perl C<pack> format, but must specify a single
		603	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an
		604	optional C<!>, C<< < >> or C<< > >> modifier).
		605
		606	=cut
		607
		608	register_write_type packstring => sub {
		609	my ($self, $format, $string) = @_;
		610
		611	pack "$format/a*", $string
483	};	612	};
484		613
485	=item json => $array_or_hashref	614	=item json => $array_or_hashref
486		615
487	Encodes the given hash or array reference into a JSON object. Unless you	616	Encodes the given hash or array reference into a JSON object. Unless you
…		…
521		650
522	$self->{json} ? $self->{json}->encode ($ref)	651	$self->{json} ? $self->{json}->encode ($ref)
523	: JSON::encode_json ($ref)	652	: JSON::encode_json ($ref)
524	};	653	};
525		654
		655	=item storable => $reference
		656
		657	Freezes the given reference using L<Storable> and writes it to the
		658	handle. Uses the C<nfreeze> format.
		659
		660	=cut
		661
		662	register_write_type storable => sub {
		663	my ($self, $ref) = @_;
		664
		665	require Storable;
		666
		667	pack "w/a*", Storable::nfreeze ($ref)
		668	};
		669
526	=back	670	=back
527		671
528	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)	672	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)
529		673
530	This function (not method) lets you add your own types to C<push_write>.	674	This function (not method) lets you add your own types to C<push_write>.
…		…
552	ways, the "simple" way, using only C<on_read> and the "complex" way, using	696	ways, the "simple" way, using only C<on_read> and the "complex" way, using
553	a queue.	697	a queue.
554		698
555	In the simple case, you just install an C<on_read> callback and whenever	699	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	700	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	701	enough is there) from the read buffer (C<< $handle->rbuf >>). Or you cna
558	or not.	702	leave the data there if you want to accumulate more (e.g. when only a
		703	partial message has been received so far).
559		704
560	In the more complex case, you want to queue multiple callbacks. In this	705	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	706	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>,	707	data arrives (also the first time it is queued) and removes it when it has
563	below).	708	done its job (see C<push_read>, below).
564		709
565	This way you can, for example, push three line-reads, followed by reading	710	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.	711	a chunk of data, and AnyEvent::Handle will execute them in order.
567		712
568	Example 1: EPP protocol parser. EPP sends 4 byte length info, followed by	713	Example 1: EPP protocol parser. EPP sends 4 byte length info, followed by
…		…
581	# handle xml	726	# handle xml
582	});	727	});
583	});	728	});
584	});	729	});
585		730
586	Example 2: Implement a client for a protocol that replies either with	731	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	732	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	733	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	734	just pipeline sending both requests and manipulate the queue as necessary
590	the callbacks:	735	in the callbacks.
591		736
592	# request one	737	When the first callback is called and sees an "OK" response, it will
		738	C<unshift> another line-read. This line-read will be queued I<before> the
		739	64-byte chunk callback.
		740
		741	# request one, returns either "OK + extra line" or "ERROR"
593	$handle->push_write ("request 1\015\012");	742	$handle->push_write ("request 1\015\012");
594		743
595	# we expect "ERROR" or "OK" as response, so push a line read	744	# we expect "ERROR" or "OK" as response, so push a line read
596	$handle->push_read (line => sub {	745	$handle->push_read (line => sub {
597	# if we got an "OK", we have to _prepend_ another line,	746	# if we got an "OK", we have to _prepend_ another line,
…		…
604	...	753	...
605	});	754	});
606	}	755	}
607	});	756	});
608		757
609	# request two	758	# request two, simply returns 64 octets
610	$handle->push_write ("request 2\015\012");	759	$handle->push_write ("request 2\015\012");
611		760
612	# simply read 64 bytes, always	761	# simply read 64 bytes, always
613	$handle->push_read (chunk => 64, sub {	762	$handle->push_read (chunk => 64, sub {
614	my $response = $_[1];	763	my $response = $_[1];
…		…
620	=cut	769	=cut
621		770
622	sub _drain_rbuf {	771	sub _drain_rbuf {
623	my ($self) = @_;	772	my ($self) = @_;
624		773
		774	local $self->{_in_drain} = 1;
		775
625	if (	776	if (
626	defined $self->{rbuf_max}	777	defined $self->{rbuf_max}
627	&& $self->{rbuf_max} < length $self->{rbuf}	778	&& $self->{rbuf_max} < length $self->{rbuf}
628	) {	779	) {
629	return $self->_error (&Errno::ENOSPC, 1);	780	$self->_error (&Errno::ENOSPC, 1), return;
630	}	781	}
631		782
632	return if $self->{in_drain};	783	while () {
633	local $self->{in_drain} = 1;	784	# we need to use a separate tls read buffer, as we must not receive data while
		785	# we are draining the buffer, and this can only happen with TLS.
		786	$self->{rbuf} .= delete $self->{_tls_rbuf} if exists $self->{_tls_rbuf};
634		787
635	while (my $len = length $self->{rbuf}) {	788	my $len = length $self->{rbuf};
636	no strict 'refs';	789
637	if (my $cb = shift @{ $self->{_queue} }) {	790	if (my $cb = shift @{ $self->{_queue} }) {
638	unless ($cb->($self)) {	791	unless ($cb->($self)) {
639	if ($self->{_eof}) {	792	if ($self->{_eof}) {
640	# no progress can be made (not enough data and no data forthcoming)	793	# no progress can be made (not enough data and no data forthcoming)
641	return $self->_error (&Errno::EPIPE, 1);	794	$self->_error (&Errno::EPIPE, 1), return;
642	}	795	}
643		796
644	unshift @{ $self->{_queue} }, $cb;	797	unshift @{ $self->{_queue} }, $cb;
645	last;	798	last;
646	}	799	}
647	} elsif ($self->{on_read}) {	800	} elsif ($self->{on_read}) {
		801	last unless $len;
		802
648	$self->{on_read}($self);	803	$self->{on_read}($self);
649		804
650	if (	805	if (
651	$len == length $self->{rbuf} # if no data has been consumed	806	$len == length $self->{rbuf} # if no data has been consumed
652	&& !@{ $self->{_queue} } # and the queue is still empty	807	&& !@{ $self->{_queue} } # and the queue is still empty
653	&& $self->{on_read} # but we still have on_read	808	&& $self->{on_read} # but we still have on_read
654	) {	809	) {
655	# no further data will arrive	810	# no further data will arrive
656	# so no progress can be made	811	# so no progress can be made
657	return $self->_error (&Errno::EPIPE, 1)	812	$self->_error (&Errno::EPIPE, 1), return
658	if $self->{_eof};	813	if $self->{_eof};
659		814
660	last; # more data might arrive	815	last; # more data might arrive
661	}	816	}
662	} else {	817	} else {
663	# read side becomes idle	818	# read side becomes idle
664	delete $self->{_rw};	819	delete $self->{_rw} unless $self->{tls};
665	last;	820	last;
666	}	821	}
667	}	822	}
668		823
		824	if ($self->{_eof}) {
		825	if ($self->{on_eof}) {
669	$self->{on_eof}($self)	826	$self->{on_eof}($self)
670	if $self->{_eof} && $self->{on_eof};	827	} else {
		828	$self->_error (0, 1);
		829	}
		830	}
671		831
672	# may need to restart read watcher	832	# may need to restart read watcher
673	unless ($self->{_rw}) {	833	unless ($self->{_rw}) {
674	$self->start_read	834	$self->start_read
675	if $self->{on_read} \|\| @{ $self->{_queue} };	835	if $self->{on_read} \|\| @{ $self->{_queue} };
…		…
686		846
687	sub on_read {	847	sub on_read {
688	my ($self, $cb) = @_;	848	my ($self, $cb) = @_;
689		849
690	$self->{on_read} = $cb;	850	$self->{on_read} = $cb;
		851	$self->_drain_rbuf if $cb && !$self->{_in_drain};
691	}	852	}
692		853
693	=item $handle->rbuf	854	=item $handle->rbuf
694		855
695	Returns the read buffer (as a modifiable lvalue).	856	Returns the read buffer (as a modifiable lvalue).
696		857
697	You can access the read buffer directly as the C<< ->{rbuf} >> member, if	858	You can access the read buffer directly as the C<< ->{rbuf} >>
698	you want.	859	member, if you want. However, the only operation allowed on the
		860	read buffer (apart from looking at it) is removing data from its
		861	beginning. Otherwise modifying or appending to it is not allowed and will
		862	lead to hard-to-track-down bugs.
699		863
700	NOTE: The read buffer should only be used or modified if the C<on_read>,	864	NOTE: The read buffer should only be used or modified if the C<on_read>,
701	C<push_read> or C<unshift_read> methods are used. The other read methods	865	C<push_read> or C<unshift_read> methods are used. The other read methods
702	automatically manage the read buffer.	866	automatically manage the read buffer.
703		867
…		…
744	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read")	908	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read")
745	->($self, $cb, @_);	909	->($self, $cb, @_);
746	}	910	}
747		911
748	push @{ $self->{_queue} }, $cb;	912	push @{ $self->{_queue} }, $cb;
749	$self->_drain_rbuf;	913	$self->_drain_rbuf unless $self->{_in_drain};
750	}	914	}
751		915
752	sub unshift_read {	916	sub unshift_read {
753	my $self = shift;	917	my $self = shift;
754	my $cb = pop;	918	my $cb = pop;
…		…
760	->($self, $cb, @_);	924	->($self, $cb, @_);
761	}	925	}
762		926
763		927
764	unshift @{ $self->{_queue} }, $cb;	928	unshift @{ $self->{_queue} }, $cb;
765	$self->_drain_rbuf;	929	$self->_drain_rbuf unless $self->{_in_drain};
766	}	930	}
767		931
768	=item $handle->push_read (type => @args, $cb)	932	=item $handle->push_read (type => @args, $cb)
769		933
770	=item $handle->unshift_read (type => @args, $cb)	934	=item $handle->unshift_read (type => @args, $cb)
…		…
800	$cb->($_[0], substr $_[0]{rbuf}, 0, $len, "");	964	$cb->($_[0], substr $_[0]{rbuf}, 0, $len, "");
801	1	965	1
802	}	966	}
803	};	967	};
804		968
805	# compatibility with older API
806	sub push_read_chunk {
807	$_[0]->push_read (chunk => $_[1], $_[2]);
808	}
809
810	sub unshift_read_chunk {
811	$_[0]->unshift_read (chunk => $_[1], $_[2]);
812	}
813
814	=item line => [$eol, ]$cb->($handle, $line, $eol)	969	=item line => [$eol, ]$cb->($handle, $line, $eol)
815		970
816	The callback will be called only once a full line (including the end of	971	The callback will be called only once a full line (including the end of
817	line marker, C<$eol>) has been read. This line (excluding the end of line	972	line marker, C<$eol>) has been read. This line (excluding the end of line
818	marker) will be passed to the callback as second argument (C<$line>), and	973	marker) will be passed to the callback as second argument (C<$line>), and
…		…
833	=cut	988	=cut
834		989
835	register_read_type line => sub {	990	register_read_type line => sub {
836	my ($self, $cb, $eol) = @_;	991	my ($self, $cb, $eol) = @_;
837		992
838	$eol = qr\|(\015?\012)\| if @_ < 3;	993	if (@_ < 3) {
839	$eol = quotemeta $eol unless ref $eol;	994	# this is more than twice as fast as the generic code below
840	$eol = qr\|^(.*?)($eol)\|s;
841
842	sub {	995	sub {
843	$_[0]{rbuf} =~ s/$eol// or return;	996	$_[0]{rbuf} =~ s/^([^\015\012]*)(\015?\012)// or return;
844		997
845	$cb->($_[0], $1, $2);	998	$cb->($_[0], $1, $2);
846	1
847	}
848	};
849
850	# compatibility with older API
851	sub push_read_line {
852	my $self = shift;
853	$self->push_read (line => @_);
854	}
855
856	sub unshift_read_line {
857	my $self = shift;
858	$self->unshift_read (line => @_);
859	}
860
861	=item netstring => $cb->($handle, $string)
862
863	A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement).
864
865	Throws an error with C<$!> set to EBADMSG on format violations.
866
867	=cut
868
869	register_read_type netstring => sub {
870	my ($self, $cb) = @_;
871
872	sub {
873	unless ($_[0]{rbuf} =~ s/^(0\|[1-9][0-9]*)://) {
874	if ($_[0]{rbuf} =~ /[^0-9]/) {
875	$self->_error (&Errno::EBADMSG);
876	}	999	1
877	return;
878	}	1000	}
		1001	} else {
		1002	$eol = quotemeta $eol unless ref $eol;
		1003	$eol = qr\|^(.*?)($eol)\|s;
879		1004
880	my $len = $1;	1005	sub {
		1006	$_[0]{rbuf} =~ s/$eol// or return;
881		1007
882	$self->unshift_read (chunk => $len, sub {	1008	$cb->($_[0], $1, $2);
883	my $string = $_[1];
884	$_[0]->unshift_read (chunk => 1, sub {
885	if ($_[1] eq ",") {
886	$cb->($_[0], $string);
887	} else {
888	$self->_error (&Errno::EBADMSG);
889	}
890	});	1009	1
891	});	1010	}
892
893	1
894	}	1011	}
895	};	1012	};
896		1013
897	=item regex => $accept[, $reject[, $skip], $cb->($handle, $data)	1014	=item regex => $accept[, $reject[, $skip], $cb->($handle, $data)
898		1015
…		…
962		1079
963	()	1080	()
964	}	1081	}
965	};	1082	};
966		1083
		1084	=item netstring => $cb->($handle, $string)
		1085
		1086	A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement).
		1087
		1088	Throws an error with C<$!> set to EBADMSG on format violations.
		1089
		1090	=cut
		1091
		1092	register_read_type netstring => sub {
		1093	my ($self, $cb) = @_;
		1094
		1095	sub {
		1096	unless ($_[0]{rbuf} =~ s/^(0\|[1-9][0-9]*)://) {
		1097	if ($_[0]{rbuf} =~ /[^0-9]/) {
		1098	$self->_error (&Errno::EBADMSG);
		1099	}
		1100	return;
		1101	}
		1102
		1103	my $len = $1;
		1104
		1105	$self->unshift_read (chunk => $len, sub {
		1106	my $string = $_[1];
		1107	$_[0]->unshift_read (chunk => 1, sub {
		1108	if ($_[1] eq ",") {
		1109	$cb->($_[0], $string);
		1110	} else {
		1111	$self->_error (&Errno::EBADMSG);
		1112	}
		1113	});
		1114	});
		1115
		1116	1
		1117	}
		1118	};
		1119
		1120	=item packstring => $format, $cb->($handle, $string)
		1121
		1122	An octet string prefixed with an encoded length. The encoding C<$format>
		1123	uses the same format as a Perl C<pack> format, but must specify a single
		1124	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an
		1125	optional C<!>, C<< < >> or C<< > >> modifier).
		1126
		1127	For example, DNS over TCP uses a prefix of C<n> (2 octet network order),
		1128	EPP uses a prefix of C<N> (4 octtes).
		1129
		1130	Example: read a block of data prefixed by its length in BER-encoded
		1131	format (very efficient).
		1132
		1133	$handle->push_read (packstring => "w", sub {
		1134	my ($handle, $data) = @_;
		1135	});
		1136
		1137	=cut
		1138
		1139	register_read_type packstring => sub {
		1140	my ($self, $cb, $format) = @_;
		1141
		1142	sub {
		1143	# when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method
		1144	defined (my $len = eval { unpack $format, $_[0]{rbuf} })
		1145	or return;
		1146
		1147	$format = length pack $format, $len;
		1148
		1149	# bypass unshift if we already have the remaining chunk
		1150	if ($format + $len <= length $_[0]{rbuf}) {
		1151	my $data = substr $_[0]{rbuf}, $format, $len;
		1152	substr $_[0]{rbuf}, 0, $format + $len, "";
		1153	$cb->($_[0], $data);
		1154	} else {
		1155	# remove prefix
		1156	substr $_[0]{rbuf}, 0, $format, "";
		1157
		1158	# read remaining chunk
		1159	$_[0]->unshift_read (chunk => $len, $cb);
		1160	}
		1161
		1162	1
		1163	}
		1164	};
		1165
967	=item json => $cb->($handle, $hash_or_arrayref)	1166	=item json => $cb->($handle, $hash_or_arrayref)
968		1167
969	Reads a JSON object or array, decodes it and passes it to the callback.	1168	Reads a JSON object or array, decodes it and passes it to the
		1169	callback. When a parse error occurs, an C<EBADMSG> error will be raised.
970		1170
971	If a C<json> object was passed to the constructor, then that will be used	1171	If a C<json> object was passed to the constructor, then that will be used
972	for the final decode, otherwise it will create a JSON coder expecting UTF-8.	1172	for the final decode, otherwise it will create a JSON coder expecting UTF-8.
973		1173
974	This read type uses the incremental parser available with JSON version	1174	This read type uses the incremental parser available with JSON version
…		…
981	the C<json> write type description, above, for an actual example.	1181	the C<json> write type description, above, for an actual example.
982		1182
983	=cut	1183	=cut
984		1184
985	register_read_type json => sub {	1185	register_read_type json => sub {
986	my ($self, $cb, $accept, $reject, $skip) = @_;	1186	my ($self, $cb) = @_;
987		1187
988	require JSON;	1188	require JSON;
989		1189
990	my $data;	1190	my $data;
991	my $rbuf = \$self->{rbuf};	1191	my $rbuf = \$self->{rbuf};
992		1192
993	my $json = $self->{json} \|\|= JSON->new->utf8;	1193	my $json = $self->{json} \|\|= JSON->new->utf8;
994		1194
995	sub {	1195	sub {
996	my $ref = $json->incr_parse ($self->{rbuf});	1196	my $ref = eval { $json->incr_parse ($self->{rbuf}) };
997		1197
998	if ($ref) {	1198	if ($ref) {
999	$self->{rbuf} = $json->incr_text;	1199	$self->{rbuf} = $json->incr_text;
1000	$json->incr_text = "";	1200	$json->incr_text = "";
1001	$cb->($self, $ref);	1201	$cb->($self, $ref);
1002		1202
1003	1	1203	1
		1204	} elsif ($@) {
		1205	# error case
		1206	$json->incr_skip;
		1207
		1208	$self->{rbuf} = $json->incr_text;
		1209	$json->incr_text = "";
		1210
		1211	$self->_error (&Errno::EBADMSG);
		1212
		1213	()
1004	} else {	1214	} else {
1005	$self->{rbuf} = "";	1215	$self->{rbuf} = "";
		1216
1006	()	1217	()
1007	}	1218	}
		1219	}
		1220	};
		1221
		1222	=item storable => $cb->($handle, $ref)
		1223
		1224	Deserialises a L<Storable> frozen representation as written by the
		1225	C<storable> write type (BER-encoded length prefix followed by nfreeze'd
		1226	data).
		1227
		1228	Raises C<EBADMSG> error if the data could not be decoded.
		1229
		1230	=cut
		1231
		1232	register_read_type storable => sub {
		1233	my ($self, $cb) = @_;
		1234
		1235	require Storable;
		1236
		1237	sub {
		1238	# when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method
		1239	defined (my $len = eval { unpack "w", $_[0]{rbuf} })
		1240	or return;
		1241
		1242	my $format = length pack "w", $len;
		1243
		1244	# bypass unshift if we already have the remaining chunk
		1245	if ($format + $len <= length $_[0]{rbuf}) {
		1246	my $data = substr $_[0]{rbuf}, $format, $len;
		1247	substr $_[0]{rbuf}, 0, $format + $len, "";
		1248	$cb->($_[0], Storable::thaw ($data));
		1249	} else {
		1250	# remove prefix
		1251	substr $_[0]{rbuf}, 0, $format, "";
		1252
		1253	# read remaining chunk
		1254	$_[0]->unshift_read (chunk => $len, sub {
		1255	if (my $ref = eval { Storable::thaw ($_[1]) }) {
		1256	$cb->($_[0], $ref);
		1257	} else {
		1258	$self->_error (&Errno::EBADMSG);
		1259	}
		1260	});
		1261	}
		1262
		1263	1
1008	}	1264	}
1009	};	1265	};
1010		1266
1011	=back	1267	=back
1012		1268
…		…
1033	=item $handle->stop_read	1289	=item $handle->stop_read
1034		1290
1035	=item $handle->start_read	1291	=item $handle->start_read
1036		1292
1037	In rare cases you actually do not want to read anything from the	1293	In rare cases you actually do not want to read anything from the
1038	socket. In this case you can call C<stop_read>. Neither C<on_read> no	1294	socket. In this case you can call C<stop_read>. Neither C<on_read> nor
1039	any queued callbacks will be executed then. To start reading again, call	1295	any queued callbacks will be executed then. To start reading again, call
1040	C<start_read>.	1296	C<start_read>.
1041		1297
1042	Note that AnyEvent::Handle will automatically C<start_read> for you when	1298	Note that AnyEvent::Handle will automatically C<start_read> for you when
1043	you change the C<on_read> callback or push/unshift a read callback, and it	1299	you change the C<on_read> callback or push/unshift a read callback, and it
1044	will automatically C<stop_read> for you when neither C<on_read> is set nor	1300	will automatically C<stop_read> for you when neither C<on_read> is set nor
1045	there are any read requests in the queue.	1301	there are any read requests in the queue.
1046		1302
		1303	These methods will have no effect when in TLS mode (as TLS doesn't support
		1304	half-duplex connections).
		1305
1047	=cut	1306	=cut
1048		1307
1049	sub stop_read {	1308	sub stop_read {
1050	my ($self) = @_;	1309	my ($self) = @_;
1051		1310
1052	delete $self->{_rw};	1311	delete $self->{_rw} unless $self->{tls};
1053	}	1312	}
1054		1313
1055	sub start_read {	1314	sub start_read {
1056	my ($self) = @_;	1315	my ($self) = @_;
1057		1316
1058	unless ($self->{_rw} \|\| $self->{_eof}) {	1317	unless ($self->{_rw} \|\| $self->{_eof}) {
1059	Scalar::Util::weaken $self;	1318	Scalar::Util::weaken $self;
1060		1319
1061	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {	1320	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {
1062	my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf};	1321	my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});
1063	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} \|\| 8192, length $$rbuf;	1322	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} \|\| 8192, length $$rbuf;
1064		1323
1065	if ($len > 0) {	1324	if ($len > 0) {
1066	$self->{_activity} = AnyEvent->now;	1325	$self->{_activity} = AnyEvent->now;
1067		1326
1068	$self->{filter_r}	1327	if ($self->{tls}) {
1069	? $self->{filter_r}($self, $rbuf)	1328	Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);
1070	: $self->_drain_rbuf;	1329
		1330	&_dotls ($self);
		1331	} else {
		1332	$self->_drain_rbuf unless $self->{_in_drain};
		1333	}
1071		1334
1072	} elsif (defined $len) {	1335	} elsif (defined $len) {
1073	delete $self->{_rw};	1336	delete $self->{_rw};
1074	$self->{_eof} = 1;	1337	$self->{_eof} = 1;
1075	$self->_drain_rbuf;	1338	$self->_drain_rbuf unless $self->{_in_drain};
1076		1339
1077	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	1340	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
1078	return $self->_error ($!, 1);	1341	return $self->_error ($!, 1);
1079	}	1342	}
1080	});	1343	});
1081	}	1344	}
1082	}	1345	}
1083		1346
		1347	# poll the write BIO and send the data if applicable
1084	sub _dotls {	1348	sub _dotls {
1085	my ($self) = @_;	1349	my ($self) = @_;
1086		1350
1087	my $buf;	1351	my $tmp;
1088		1352
1089	if (length $self->{_tls_wbuf}) {	1353	if (length $self->{_tls_wbuf}) {
1090	while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {	1354	while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {
1091	substr $self->{_tls_wbuf}, 0, $len, "";	1355	substr $self->{_tls_wbuf}, 0, $tmp, "";
1092	}	1356	}
1093	}	1357	}
1094		1358
1095	if (length ($buf = Net::SSLeay::BIO_read ($self->{_wbio}))) {
1096	$self->{wbuf} .= $buf;
1097	$self->_drain_wbuf;
1098	}
1099
1100	while (defined ($buf = Net::SSLeay::read ($self->{tls}))) {	1359	while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) {
1101	if (length $buf) {	1360	unless (length $tmp) {
1102	$self->{rbuf} .= $buf;
1103	$self->_drain_rbuf;
1104	} else {
1105	# let's treat SSL-eof as we treat normal EOF	1361	# let's treat SSL-eof as we treat normal EOF
		1362	delete $self->{_rw};
1106	$self->{_eof} = 1;	1363	$self->{_eof} = 1;
1107	$self->_shutdown;	1364	&_freetls;
1108	return;
1109	}	1365	}
1110	}
1111		1366
		1367	$self->{_tls_rbuf} .= $tmp;
		1368	$self->_drain_rbuf unless $self->{_in_drain};
		1369	$self->{tls} or return; # tls session might have gone away in callback
		1370	}
		1371
1112	my $err = Net::SSLeay::get_error ($self->{tls}, -1);	1372	$tmp = Net::SSLeay::get_error ($self->{tls}, -1);
1113		1373
1114	if ($err!= Net::SSLeay::ERROR_WANT_READ ()) {	1374	if ($tmp != Net::SSLeay::ERROR_WANT_READ ()) {
1115	if ($err == Net::SSLeay::ERROR_SYSCALL ()) {	1375	if ($tmp == Net::SSLeay::ERROR_SYSCALL ()) {
1116	return $self->_error ($!, 1);	1376	return $self->_error ($!, 1);
1117	} elsif ($err == Net::SSLeay::ERROR_SSL ()) {	1377	} elsif ($tmp == Net::SSLeay::ERROR_SSL ()) {
1118	return $self->_error (&Errno::EIO, 1);	1378	return $self->_error (&Errno::EIO, 1);
1119	}	1379	}
1120		1380
1121	# all others are fine for our purposes	1381	# all other errors are fine for our purposes
		1382	}
		1383
		1384	while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) {
		1385	$self->{wbuf} .= $tmp;
		1386	$self->_drain_wbuf;
1122	}	1387	}
1123	}	1388	}
1124		1389
1125	=item $handle->starttls ($tls[, $tls_ctx])	1390	=item $handle->starttls ($tls[, $tls_ctx])
1126		1391
…		…
1129	C<starttls>.	1394	C<starttls>.
1130		1395
1131	The first argument is the same as the C<tls> constructor argument (either	1396	The first argument is the same as the C<tls> constructor argument (either
1132	C<"connect">, C<"accept"> or an existing Net::SSLeay object).	1397	C<"connect">, C<"accept"> or an existing Net::SSLeay object).
1133		1398
1134	The second argument is the optional C<Net::SSLeay::CTX> object that is	1399	The second argument is the optional C<AnyEvent::TLS> object that is used
1135	used when AnyEvent::Handle has to create its own TLS connection object.	1400	when AnyEvent::Handle has to create its own TLS connection object, or
		1401	a hash reference with C<< key => value >> pairs that will be used to
		1402	construct a new context.
1136		1403
1137	The TLS connection object will end up in C<< $handle->{tls} >> after this	1404	The TLS connection object will end up in C<< $handle->{tls} >>, the TLS
1138	call and can be used or changed to your liking. Note that the handshake	1405	context in C<< $handle->{tls_ctx} >> after this call and can be used or
1139	might have already started when this function returns.	1406	changed to your liking. Note that the handshake might have already started
		1407	when this function returns.
		1408
		1409	If it an error to start a TLS handshake more than once per
		1410	AnyEvent::Handle object (this is due to bugs in OpenSSL).
1140		1411
1141	=cut	1412	=cut
1142		1413
1143	sub starttls {	1414	sub starttls {
1144	my ($self, $ssl, $ctx) = @_;	1415	my ($self, $ssl, $ctx) = @_;
1145		1416
1146	$self->stoptls;	1417	require Net::SSLeay;
1147		1418
1148	if ($ssl eq "accept") {	1419	Carp::croak "it is an error to call starttls more than once on an AnyEvent::Handle object"
1149	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());	1420	if $self->{tls};
1150	Net::SSLeay::set_accept_state ($ssl);	1421
1151	} elsif ($ssl eq "connect") {	1422	$ctx \|\|= $self->{tls_ctx};
1152	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());	1423
1153	Net::SSLeay::set_connect_state ($ssl);	1424	if ("HASH" eq ref $ctx) {
		1425	require AnyEvent::TLS;
		1426
		1427	local $Carp::CarpLevel = 1; # skip ourselves when creating a new context
		1428	$ctx = new AnyEvent::TLS %$ctx;
		1429	}
1154	}	1430
1155		1431	$self->{tls_ctx} = $ctx \|\| TLS_CTX ();
1156	$self->{tls} = $ssl;	1432	$self->{tls} = $ssl = $self->{tls_ctx}->_get_session ($ssl, $self);
1157		1433
1158	# basically, this is deep magic (because SSL_read should have the same issues)	1434	# basically, this is deep magic (because SSL_read should have the same issues)
1159	# but the openssl maintainers basically said: "trust us, it just works".	1435	# but the openssl maintainers basically said: "trust us, it just works".
1160	# (unfortunately, we have to hardcode constants because the abysmally misdesigned	1436	# (unfortunately, we have to hardcode constants because the abysmally misdesigned
1161	# and mismaintained ssleay-module doesn't even offer them).	1437	# and mismaintained ssleay-module doesn't even offer them).
1162	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html	1438	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html
		1439	#
		1440	# in short: this is a mess.
		1441	#
		1442	# note that we do not try to keep the length constant between writes as we are required to do.
		1443	# we assume that most (but not all) of this insanity only applies to non-blocking cases,
		1444	# and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to
		1445	# have identity issues in that area.
1163	Net::SSLeay::CTX_set_mode ($self->{tls},	1446	# Net::SSLeay::CTX_set_mode ($ssl,
1164	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } \|\| 1)	1447	# (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } \|\| 1)
1165	\| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } \|\| 2));	1448	# \| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } \|\| 2));
		1449	Net::SSLeay::CTX_set_mode ($ssl, 1\|2);
1166		1450
1167	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1451	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1168	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1452	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1169		1453
1170	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});	1454	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});
1171		1455
1172	$self->{filter_w} = sub {	1456	&_dotls; # need to trigger the initial handshake
1173	$_[0]{_tls_wbuf} .= ${$_[1]};	1457	$self->start_read; # make sure we actually do read
1174	&_dotls;
1175	};
1176	$self->{filter_r} = sub {
1177	Net::SSLeay::BIO_write ($_[0]{_rbio}, ${$_[1]});
1178	&_dotls;
1179	};
1180	}	1458	}
1181		1459
1182	=item $handle->stoptls	1460	=item $handle->stoptls
1183		1461
1184	Destroys the SSL connection, if any. Partial read or write data will be	1462	Shuts down the SSL connection - this makes a proper EOF handshake by
1185	lost.	1463	sending a close notify to the other side, but since OpenSSL doesn't
		1464	support non-blocking shut downs, it is not possible to re-use the stream
		1465	afterwards.
1186		1466
1187	=cut	1467	=cut
1188		1468
1189	sub stoptls {	1469	sub stoptls {
1190	my ($self) = @_;	1470	my ($self) = @_;
1191		1471
1192	Net::SSLeay::free (delete $self->{tls}) if $self->{tls};	1472	if ($self->{tls}) {
		1473	Net::SSLeay::shutdown ($self->{tls});
1193		1474
1194	delete $self->{_rbio};	1475	&_dotls;
1195	delete $self->{_wbio};	1476
1196	delete $self->{_tls_wbuf};	1477	# we don't give a shit. no, we do, but we can't. no...
1197	delete $self->{filter_r};	1478	# we, we... have to use openssl :/
1198	delete $self->{filter_w};	1479	&_freetls;
		1480	}
		1481	}
		1482
		1483	sub _freetls {
		1484	my ($self) = @_;
		1485
		1486	return unless $self->{tls};
		1487
		1488	$self->{tls_ctx}->_put_session (delete $self->{tls});
		1489
		1490	delete @$self{qw(_rbio _wbio _tls_wbuf)};
1199	}	1491	}
1200		1492
1201	sub DESTROY {	1493	sub DESTROY {
1202	my $self = shift;	1494	my ($self) = @_;
1203		1495
1204	$self->stoptls;	1496	&_freetls;
		1497
		1498	my $linger = exists $self->{linger} ? $self->{linger} : 3600;
		1499
		1500	if ($linger && length $self->{wbuf}) {
		1501	my $fh = delete $self->{fh};
		1502	my $wbuf = delete $self->{wbuf};
		1503
		1504	my @linger;
		1505
		1506	push @linger, AnyEvent->io (fh => $fh, poll => "w", cb => sub {
		1507	my $len = syswrite $fh, $wbuf, length $wbuf;
		1508
		1509	if ($len > 0) {
		1510	substr $wbuf, 0, $len, "";
		1511	} else {
		1512	@linger = (); # end
		1513	}
		1514	});
		1515	push @linger, AnyEvent->timer (after => $linger, cb => sub {
		1516	@linger = ();
		1517	});
		1518	}
		1519	}
		1520
		1521	=item $handle->destroy
		1522
		1523	Shuts down the handle object as much as possible - this call ensures that
		1524	no further callbacks will be invoked and resources will be freed as much
		1525	as possible. You must not call any methods on the object afterwards.
		1526
		1527	Normally, you can just "forget" any references to an AnyEvent::Handle
		1528	object and it will simply shut down. This works in fatal error and EOF
		1529	callbacks, as well as code outside. It does I<NOT> work in a read or write
		1530	callback, so when you want to destroy the AnyEvent::Handle object from
		1531	within such an callback. You I<MUST> call C<< ->destroy >> explicitly in
		1532	that case.
		1533
		1534	The handle might still linger in the background and write out remaining
		1535	data, as specified by the C<linger> option, however.
		1536
		1537	=cut
		1538
		1539	sub destroy {
		1540	my ($self) = @_;
		1541
		1542	$self->DESTROY;
		1543	%$self = ();
1205	}	1544	}
1206		1545
1207	=item AnyEvent::Handle::TLS_CTX	1546	=item AnyEvent::Handle::TLS_CTX
1208		1547
1209	This function creates and returns the Net::SSLeay::CTX object used by	1548	This function creates and returns the AnyEvent::TLS object used by default
1210	default for TLS mode.	1549	for TLS mode.
1211		1550
1212	The context is created like this:	1551	The context is created by calling L<AnyEvent::TLS> without any arguments.
1213
1214	Net::SSLeay::load_error_strings;
1215	Net::SSLeay::SSLeay_add_ssl_algorithms;
1216	Net::SSLeay::randomize;
1217
1218	my $CTX = Net::SSLeay::CTX_new;
1219
1220	Net::SSLeay::CTX_set_options $CTX, Net::SSLeay::OP_ALL
1221		1552
1222	=cut	1553	=cut
1223		1554
1224	our $TLS_CTX;	1555	our $TLS_CTX;
1225		1556
1226	sub TLS_CTX() {	1557	sub TLS_CTX() {
1227	$TLS_CTX \|\| do {	1558	$TLS_CTX \|\|= do {
1228	require Net::SSLeay;	1559	require AnyEvent::TLS;
1229		1560
1230	Net::SSLeay::load_error_strings ();	1561	new AnyEvent::TLS
1231	Net::SSLeay::SSLeay_add_ssl_algorithms ();
1232	Net::SSLeay::randomize ();
1233
1234	$TLS_CTX = Net::SSLeay::CTX_new ();
1235
1236	Net::SSLeay::CTX_set_options ($TLS_CTX, Net::SSLeay::OP_ALL ());
1237
1238	$TLS_CTX
1239	}	1562	}
1240	}	1563	}
1241		1564
1242	=back	1565	=back
		1566
		1567
		1568	=head1 NONFREQUENTLY ASKED QUESTIONS
		1569
		1570	=over 4
		1571
		1572	=item I C<undef> the AnyEvent::Handle reference inside my callback and
		1573	still get further invocations!
		1574
		1575	That's because AnyEvent::Handle keeps a reference to itself when handling
		1576	read or write callbacks.
		1577
		1578	It is only safe to "forget" the reference inside EOF or error callbacks,
		1579	from within all other callbacks, you need to explicitly call the C<<
		1580	->destroy >> method.
		1581
		1582	=item I get different callback invocations in TLS mode/Why can't I pause
		1583	reading?
		1584
		1585	Unlike, say, TCP, TLS connections do not consist of two independent
		1586	communication channels, one for each direction. Or put differently. The
		1587	read and write directions are not independent of each other: you cannot
		1588	write data unless you are also prepared to read, and vice versa.
		1589
		1590	This can mean than, in TLS mode, you might get C<on_error> or C<on_eof>
		1591	callback invocations when you are not expecting any read data - the reason
		1592	is that AnyEvent::Handle always reads in TLS mode.
		1593
		1594	During the connection, you have to make sure that you always have a
		1595	non-empty read-queue, or an C<on_read> watcher. At the end of the
		1596	connection (or when you no longer want to use it) you can call the
		1597	C<destroy> method.
		1598
		1599	=item How do I read data until the other side closes the connection?
		1600
		1601	If you just want to read your data into a perl scalar, the easiest way
		1602	to achieve this is by setting an C<on_read> callback that does nothing,
		1603	clearing the C<on_eof> callback and in the C<on_error> callback, the data
		1604	will be in C<$_[0]{rbuf}>:
		1605
		1606	$handle->on_read (sub { });
		1607	$handle->on_eof (undef);
		1608	$handle->on_error (sub {
		1609	my $data = delete $_[0]{rbuf};
		1610	undef $handle;
		1611	});
		1612
		1613	The reason to use C<on_error> is that TCP connections, due to latencies
		1614	and packets loss, might get closed quite violently with an error, when in
		1615	fact, all data has been received.
		1616
		1617	It is usually better to use acknowledgements when transferring data,
		1618	to make sure the other side hasn't just died and you got the data
		1619	intact. This is also one reason why so many internet protocols have an
		1620	explicit QUIT command.
		1621
		1622	=item I don't want to destroy the handle too early - how do I wait until
		1623	all data has been written?
		1624
		1625	After writing your last bits of data, set the C<on_drain> callback
		1626	and destroy the handle in there - with the default setting of
		1627	C<low_water_mark> this will be called precisely when all data has been
		1628	written to the socket:
		1629
		1630	$handle->push_write (...);
		1631	$handle->on_drain (sub {
		1632	warn "all data submitted to the kernel\n";
		1633	undef $handle;
		1634	});
		1635
		1636	=back
		1637
1243		1638
1244	=head1 SUBCLASSING AnyEvent::Handle	1639	=head1 SUBCLASSING AnyEvent::Handle
1245		1640
1246	In many cases, you might want to subclass AnyEvent::Handle.	1641	In many cases, you might want to subclass AnyEvent::Handle.
1247		1642
…		…
1251	=over 4	1646	=over 4
1252		1647
1253	=item * all constructor arguments become object members.	1648	=item * all constructor arguments become object members.
1254		1649
1255	At least initially, when you pass a C<tls>-argument to the constructor it	1650	At least initially, when you pass a C<tls>-argument to the constructor it
1256	will end up in C<< $handle->{tls} >>. Those members might be changes or	1651	will end up in C<< $handle->{tls} >>. Those members might be changed or
1257	mutated later on (for example C<tls> will hold the TLS connection object).	1652	mutated later on (for example C<tls> will hold the TLS connection object).
1258		1653
1259	=item * other object member names are prefixed with an C<_>.	1654	=item * other object member names are prefixed with an C<_>.
1260		1655
1261	All object members not explicitly documented (internal use) are prefixed	1656	All object members not explicitly documented (internal use) are prefixed

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Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents): Revision 1.56 by root, Wed Jun 4 09:55:16 2008 UTC vs. Revision 1.132 by elmex, Thu Jul 2 22:25:13 2009 UTC

Diff Legend

Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.56 by root, Wed Jun 4 09:55:16 2008 UTC vs.
Revision 1.132 by elmex, Thu Jul 2 22:25:13 2009 UTC