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

Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.42 by root, Tue May 27 06:23:15 2008 UTC vs.
Revision 1.100 by root, Thu Oct 23 02:44:50 2008 UTC

…		…
1	package AnyEvent::Handle;	1	package AnyEvent::Handle;
2		2
3	no warnings;	3	no warnings;
4	use strict;	4	use strict qw(subs vars);
5		5
6	use AnyEvent ();	6	use AnyEvent ();
7	use AnyEvent::Util 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		12
13	=head1 NAME	13	=head1 NAME
14		14
15	AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent	15	AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent
16		16
17	=cut	17	=cut
18		18
19	our $VERSION = '0.04';	19	our $VERSION = 4.3;
20		20
21	=head1 SYNOPSIS	21	=head1 SYNOPSIS
22		22
23	use AnyEvent;	23	use AnyEvent;
24	use AnyEvent::Handle;	24	use AnyEvent::Handle;
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
…		…
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 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.
81		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
82	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,
83	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
84	waiting for data.	95	waiting for data.
85		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
86	=item on_error => $cb->($handle)	100	=item on_error => $cb->($handle, $fatal)
87		101
88	This is the fatal error callback, that is called when, well, a fatal error	102	This is the error callback, which is called when, well, some error
89	occurs, such as not being able to resolve the hostname, failure to connect	103	occured, such as not being able to resolve the hostname, failure to
90	or a read error.	104	connect or a read error.
91		105
92	The object will not be in a usable state when this callback has been	106	Some errors are fatal (which is indicated by C<$fatal> being true). On
93	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>).
94		116
95	On callback entrance, the value of C<$!> contains the operating system	117	On callback entrance, the value of C<$!> contains the operating system
96	error (or C<ENOSPC>, C<EPIPE> or C<EBADMSG>).	118	error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>).
97
98	The callback should throw an exception. If it returns, then
99	AnyEvent::Handle will C<croak> for you.
100		119
101	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
102	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
103	die.	122	C<croak>.
104		123
105	=item on_read => $cb->($handle)	124	=item on_read => $cb->($handle)
106		125
107	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
108	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).
109		130
110	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 >>
111	method or access the C<$handle->{rbuf}> member directly.	132	method or access the C<$handle->{rbuf}> member directly.
112		133
113	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
…		…
120	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
121	(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).
122		143
123	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.
124		145
		146	This callback is useful when you don't want to put all of your write data
		147	into the queue at once, for example, when you want to write the contents
		148	of some file to the socket you might not want to read the whole file into
		149	memory and push it into the queue, but instead only read more data from
		150	the file when the write queue becomes empty.
		151
		152	=item timeout => $fractional_seconds
		153
		154	If non-zero, then this enables an "inactivity" timeout: whenever this many
		155	seconds pass without a successful read or write on the underlying file
		156	handle, the C<on_timeout> callback will be invoked (and if that one is
		157	missing, a non-fatal C<ETIMEDOUT> error will be raised).
		158
		159	Note that timeout processing is also active when you currently do not have
		160	any outstanding read or write requests: If you plan to keep the connection
		161	idle then you should disable the timout temporarily or ignore the timeout
		162	in the C<on_timeout> callback, in which case AnyEvent::Handle will simply
		163	restart the timeout.
		164
		165	Zero (the default) disables this timeout.
		166
		167	=item on_timeout => $cb->($handle)
		168
		169	Called whenever the inactivity timeout passes. If you return from this
		170	callback, then the timeout will be reset as if some activity had happened,
		171	so this condition is not fatal in any way.
		172
125	=item rbuf_max => <bytes>	173	=item rbuf_max => <bytes>
126		174
127	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>)
128	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
129	avoid denial-of-service attacks.	177	avoid some forms of denial-of-service attacks.
130		178
131	For example, a server accepting connections from untrusted sources should	179	For example, a server accepting connections from untrusted sources should
132	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
133	(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
134	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
135	isn't finished).	183	isn't finished).
136		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
137	=item read_size => <bytes>	211	=item read_size => <bytes>
138		212
139	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
140	on each [loop iteration). Default: C<4096>.	214	try to read during each loop iteration, which affects memory
		215	requirements). Default: C<8192>.
141		216
142	=item low_water_mark => <bytes>	217	=item low_water_mark => <bytes>
143		218
144	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
145	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
146	considered empty.	221	considered empty.
147		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
148	=item tls => "accept" \| "connect" \| Net::SSLeay::SSL object	240	=item tls => "accept" \| "connect" \| Net::SSLeay::SSL object
149		241
150	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
151	will start making tls handshake and will transparently encrypt/decrypt	243	AnyEvent will start a TLS handshake as soon as the conenction has been
152	data.	244	established and will transparently encrypt/decrypt data afterwards.
153		245
154	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
155	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.
156		250
157	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
158	connection, use C<connect> mode.	252	C<accept>, and for the TLS client side of a connection, use C<connect>
		253	mode.
159		254
160	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
161	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>
162	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
163	AnyEvent::Handle.	258	AnyEvent::Handle.
164		259
165	See the C<starttls> method if you need to start TLs negotiation later.	260	See the C<< ->starttls >> method for when need to start TLS negotiation later.
166		261
167	=item tls_ctx => $ssl_ctx	262	=item tls_ctx => $ssl_ctx
168		263
169	Use the given Net::SSLeay::CTX object to create the new TLS connection	264	Use the given C<Net::SSLeay::CTX> object to create the new TLS connection
170	(unless a connection object was specified directly). If this parameter is	265	(unless a connection object was specified directly). If this parameter is
171	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.	266	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.
172		267
173	=item json => JSON or JSON::XS object	268	=item json => JSON or JSON::XS object
174		269
175	This is the json coder object used by the C<json> read and write types.	270	This is the json coder object used by the C<json> read and write types.
176		271
177	If you don't supply it, then AnyEvent::Handle will create and use a	272	If you don't supply it, then AnyEvent::Handle will create and use a
178	suitable one, which will write and expect UTF-8 encoded JSON texts.	273	suitable one (on demand), which will write and expect UTF-8 encoded JSON
		274	texts.
179		275
180	Note that you are responsible to depend on the JSON module if you want to	276	Note that you are responsible to depend on the JSON module if you want to
181	use this functionality, as AnyEvent does not have a dependency itself.	277	use this functionality, as AnyEvent does not have a dependency itself.
182		278
183	=item filter_r => $cb
184
185	=item filter_w => $cb
186
187	These exist, but are undocumented at this time.
188
189	=back	279	=back
190		280
191	=cut	281	=cut
192		282
193	sub new {	283	sub new {
…		…
197		287
198	$self->{fh} or Carp::croak "mandatory argument fh is missing";	288	$self->{fh} or Carp::croak "mandatory argument fh is missing";
199		289
200	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;	290	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;
201		291
202	if ($self->{tls}) {
203	require Net::SSLeay;
204	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx});	292	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx})
205	}	293	if $self->{tls};
206		294
207	$self->on_eof (delete $self->{on_eof} ) if $self->{on_eof};	295	$self->{_activity} = AnyEvent->now;
208	$self->on_error (delete $self->{on_error}) if $self->{on_error};	296	$self->_timeout;
		297
209	$self->on_drain (delete $self->{on_drain}) if $self->{on_drain};	298	$self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain};
210	$self->on_read (delete $self->{on_read} ) if $self->{on_read};	299	$self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay};
211		300
212	$self->start_read;	301	$self->start_read
		302	if $self->{on_read};
213		303
214	$self	304	$self
215	}	305	}
216		306
217	sub _shutdown {	307	sub _shutdown {
218	my ($self) = @_;	308	my ($self) = @_;
219		309
		310	delete $self->{_tw};
220	delete $self->{_rw};	311	delete $self->{_rw};
221	delete $self->{_ww};	312	delete $self->{_ww};
222	delete $self->{fh};	313	delete $self->{fh};
223	}
224		314
		315	&_freetls;
		316
		317	delete $self->{on_read};
		318	delete $self->{_queue};
		319	}
		320
225	sub error {	321	sub _error {
226	my ($self) = @_;	322	my ($self, $errno, $fatal) = @_;
227		323
228	{
229	local $!;
230	$self->_shutdown;	324	$self->_shutdown
231	}	325	if $fatal;
232		326
233	$self->{on_error}($self)	327	$! = $errno;
		328
234	if $self->{on_error};	329	if ($self->{on_error}) {
235		330	$self->{on_error}($self, $fatal);
		331	} elsif ($self->{fh}) {
236	Carp::croak "AnyEvent::Handle uncaught fatal error: $!";	332	Carp::croak "AnyEvent::Handle uncaught error: $!";
		333	}
237	}	334	}
238		335
239	=item $fh = $handle->fh	336	=item $fh = $handle->fh
240		337
241	This method returns the file handle of the L<AnyEvent::Handle> object.	338	This method returns the file handle used to create the L<AnyEvent::Handle> object.
242		339
243	=cut	340	=cut
244		341
245	sub fh { $_[0]{fh} }	342	sub fh { $_[0]{fh} }
246		343
…		…
262		359
263	sub on_eof {	360	sub on_eof {
264	$_[0]{on_eof} = $_[1];	361	$_[0]{on_eof} = $_[1];
265	}	362	}
266		363
		364	=item $handle->on_timeout ($cb)
		365
		366	Replace the current C<on_timeout> callback, or disables the callback (but
		367	not the timeout) if C<$cb> = C<undef>. See the C<timeout> constructor
		368	argument and method.
		369
		370	=cut
		371
		372	sub on_timeout {
		373	$_[0]{on_timeout} = $_[1];
		374	}
		375
		376	=item $handle->autocork ($boolean)
		377
		378	Enables or disables the current autocork behaviour (see C<autocork>
		379	constructor argument).
		380
		381	=cut
		382
		383	=item $handle->no_delay ($boolean)
		384
		385	Enables or disables the C<no_delay> setting (see constructor argument of
		386	the same name for details).
		387
		388	=cut
		389
		390	sub no_delay {
		391	$_[0]{no_delay} = $_[1];
		392
		393	eval {
		394	local $SIG{__DIE__};
		395	setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1];
		396	};
		397	}
		398
		399	#############################################################################
		400
		401	=item $handle->timeout ($seconds)
		402
		403	Configures (or disables) the inactivity timeout.
		404
		405	=cut
		406
		407	sub timeout {
		408	my ($self, $timeout) = @_;
		409
		410	$self->{timeout} = $timeout;
		411	$self->_timeout;
		412	}
		413
		414	# reset the timeout watcher, as neccessary
		415	# also check for time-outs
		416	sub _timeout {
		417	my ($self) = @_;
		418
		419	if ($self->{timeout}) {
		420	my $NOW = AnyEvent->now;
		421
		422	# when would the timeout trigger?
		423	my $after = $self->{_activity} + $self->{timeout} - $NOW;
		424
		425	# now or in the past already?
		426	if ($after <= 0) {
		427	$self->{_activity} = $NOW;
		428
		429	if ($self->{on_timeout}) {
		430	$self->{on_timeout}($self);
		431	} else {
		432	$self->_error (&Errno::ETIMEDOUT);
		433	}
		434
		435	# callback could have changed timeout value, optimise
		436	return unless $self->{timeout};
		437
		438	# calculate new after
		439	$after = $self->{timeout};
		440	}
		441
		442	Scalar::Util::weaken $self;
		443	return unless $self; # ->error could have destroyed $self
		444
		445	$self->{_tw} \|\|= AnyEvent->timer (after => $after, cb => sub {
		446	delete $self->{_tw};
		447	$self->_timeout;
		448	});
		449	} else {
		450	delete $self->{_tw};
		451	}
		452	}
		453
267	#############################################################################	454	#############################################################################
268		455
269	=back	456	=back
270		457
271	=head2 WRITE QUEUE	458	=head2 WRITE QUEUE
…		…
292	my ($self, $cb) = @_;	479	my ($self, $cb) = @_;
293		480
294	$self->{on_drain} = $cb;	481	$self->{on_drain} = $cb;
295		482
296	$cb->($self)	483	$cb->($self)
297	if $cb && $self->{low_water_mark} >= length $self->{wbuf};	484	if $cb && $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf});
298	}	485	}
299		486
300	=item $handle->push_write ($data)	487	=item $handle->push_write ($data)
301		488
302	Queues the given scalar to be written. You can push as much data as you	489	Queues the given scalar to be written. You can push as much data as you
…		…
316	my $len = syswrite $self->{fh}, $self->{wbuf};	503	my $len = syswrite $self->{fh}, $self->{wbuf};
317		504
318	if ($len >= 0) {	505	if ($len >= 0) {
319	substr $self->{wbuf}, 0, $len, "";	506	substr $self->{wbuf}, 0, $len, "";
320		507
		508	$self->{_activity} = AnyEvent->now;
		509
321	$self->{on_drain}($self)	510	$self->{on_drain}($self)
322	if $self->{low_water_mark} >= length $self->{wbuf}	511	if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf})
323	&& $self->{on_drain};	512	&& $self->{on_drain};
324		513
325	delete $self->{_ww} unless length $self->{wbuf};	514	delete $self->{_ww} unless length $self->{wbuf};
326	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	515	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
327	$self->error;	516	$self->_error ($!, 1);
328	}	517	}
329	};	518	};
330		519
331	# try to write data immediately	520	# try to write data immediately
332	$cb->();	521	$cb->() unless $self->{autocork};
333		522
334	# if still data left in wbuf, we need to poll	523	# if still data left in wbuf, we need to poll
335	$self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb)	524	$self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb)
336	if length $self->{wbuf};	525	if length $self->{wbuf};
337	};	526	};
…		…
351		540
352	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")	541	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")
353	->($self, @_);	542	->($self, @_);
354	}	543	}
355		544
356	if ($self->{filter_w}) {	545	if ($self->{tls}) {
357	$self->{filter_w}->($self, \$_[0]);	546	$self->{_tls_wbuf} .= $_[0];
		547
		548	&_dotls ($self);
358	} else {	549	} else {
359	$self->{wbuf} .= $_[0];	550	$self->{wbuf} .= $_[0];
360	$self->_drain_wbuf;	551	$self->_drain_wbuf;
361	}	552	}
362	}	553	}
363		554
364	=item $handle->push_write (type => @args)	555	=item $handle->push_write (type => @args)
365		556
366	=item $handle->unshift_write (type => @args)
367
368	Instead of formatting your data yourself, you can also let this module do	557	Instead of formatting your data yourself, you can also let this module do
369	the job by specifying a type and type-specific arguments.	558	the job by specifying a type and type-specific arguments.
370		559
371	Predefined types are (if you have ideas for additional types, feel free to	560	Predefined types are (if you have ideas for additional types, feel free to
372	drop by and tell us):	561	drop by and tell us):
…		…
376	=item netstring => $string	565	=item netstring => $string
377		566
378	Formats the given value as netstring	567	Formats the given value as netstring
379	(http://cr.yp.to/proto/netstrings.txt, this is not a recommendation to use them).	568	(http://cr.yp.to/proto/netstrings.txt, this is not a recommendation to use them).
380		569
381	=back
382
383	=cut	570	=cut
384		571
385	register_write_type netstring => sub {	572	register_write_type netstring => sub {
386	my ($self, $string) = @_;	573	my ($self, $string) = @_;
387		574
388	sprintf "%d:%s,", (length $string), $string	575	(length $string) . ":$string,"
		576	};
		577
		578	=item packstring => $format, $data
		579
		580	An octet string prefixed with an encoded length. The encoding C<$format>
		581	uses the same format as a Perl C<pack> format, but must specify a single
		582	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an
		583	optional C<!>, C<< < >> or C<< > >> modifier).
		584
		585	=cut
		586
		587	register_write_type packstring => sub {
		588	my ($self, $format, $string) = @_;
		589
		590	pack "$format/a*", $string
389	};	591	};
390		592
391	=item json => $array_or_hashref	593	=item json => $array_or_hashref
392		594
393	Encodes the given hash or array reference into a JSON object. Unless you	595	Encodes the given hash or array reference into a JSON object. Unless you
…		…
427		629
428	$self->{json} ? $self->{json}->encode ($ref)	630	$self->{json} ? $self->{json}->encode ($ref)
429	: JSON::encode_json ($ref)	631	: JSON::encode_json ($ref)
430	};	632	};
431		633
		634	=item storable => $reference
		635
		636	Freezes the given reference using L<Storable> and writes it to the
		637	handle. Uses the C<nfreeze> format.
		638
		639	=cut
		640
		641	register_write_type storable => sub {
		642	my ($self, $ref) = @_;
		643
		644	require Storable;
		645
		646	pack "w/a*", Storable::nfreeze ($ref)
		647	};
		648
		649	=back
		650
432	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)	651	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)
433		652
434	This function (not method) lets you add your own types to C<push_write>.	653	This function (not method) lets you add your own types to C<push_write>.
435	Whenever the given C<type> is used, C<push_write> will invoke the code	654	Whenever the given C<type> is used, C<push_write> will invoke the code
436	reference with the handle object and the remaining arguments.	655	reference with the handle object and the remaining arguments.
…		…
456	ways, the "simple" way, using only C<on_read> and the "complex" way, using	675	ways, the "simple" way, using only C<on_read> and the "complex" way, using
457	a queue.	676	a queue.
458		677
459	In the simple case, you just install an C<on_read> callback and whenever	678	In the simple case, you just install an C<on_read> callback and whenever
460	new data arrives, it will be called. You can then remove some data (if	679	new data arrives, it will be called. You can then remove some data (if
461	enough is there) from the read buffer (C<< $handle->rbuf >>) if you want	680	enough is there) from the read buffer (C<< $handle->rbuf >>). Or you cna
462	or not.	681	leave the data there if you want to accumulate more (e.g. when only a
		682	partial message has been received so far).
463		683
464	In the more complex case, you want to queue multiple callbacks. In this	684	In the more complex case, you want to queue multiple callbacks. In this
465	case, AnyEvent::Handle will call the first queued callback each time new	685	case, AnyEvent::Handle will call the first queued callback each time new
466	data arrives and removes it when it has done its job (see C<push_read>,	686	data arrives (also the first time it is queued) and removes it when it has
467	below).	687	done its job (see C<push_read>, below).
468		688
469	This way you can, for example, push three line-reads, followed by reading	689	This way you can, for example, push three line-reads, followed by reading
470	a chunk of data, and AnyEvent::Handle will execute them in order.	690	a chunk of data, and AnyEvent::Handle will execute them in order.
471		691
472	Example 1: EPP protocol parser. EPP sends 4 byte length info, followed by	692	Example 1: EPP protocol parser. EPP sends 4 byte length info, followed by
473	the specified number of bytes which give an XML datagram.	693	the specified number of bytes which give an XML datagram.
474		694
475	# in the default state, expect some header bytes	695	# in the default state, expect some header bytes
476	$handle->on_read (sub {	696	$handle->on_read (sub {
477	# some data is here, now queue the length-header-read (4 octets)	697	# some data is here, now queue the length-header-read (4 octets)
478	shift->unshift_read_chunk (4, sub {	698	shift->unshift_read (chunk => 4, sub {
479	# header arrived, decode	699	# header arrived, decode
480	my $len = unpack "N", $_[1];	700	my $len = unpack "N", $_[1];
481		701
482	# now read the payload	702	# now read the payload
483	shift->unshift_read_chunk ($len, sub {	703	shift->unshift_read (chunk => $len, sub {
484	my $xml = $_[1];	704	my $xml = $_[1];
485	# handle xml	705	# handle xml
486	});	706	});
487	});	707	});
488	});	708	});
489		709
490	Example 2: Implement a client for a protocol that replies either with	710	Example 2: Implement a client for a protocol that replies either with "OK"
491	"OK" and another line or "ERROR" for one request, and 64 bytes for the	711	and another line or "ERROR" for the first request that is sent, and 64
492	second request. Due tot he availability of a full queue, we can just	712	bytes for the second request. Due to the availability of a queue, we can
493	pipeline sending both requests and manipulate the queue as necessary in	713	just pipeline sending both requests and manipulate the queue as necessary
494	the callbacks:	714	in the callbacks.
495		715
496	# request one	716	When the first callback is called and sees an "OK" response, it will
		717	C<unshift> another line-read. This line-read will be queued I<before> the
		718	64-byte chunk callback.
		719
		720	# request one, returns either "OK + extra line" or "ERROR"
497	$handle->push_write ("request 1\015\012");	721	$handle->push_write ("request 1\015\012");
498		722
499	# we expect "ERROR" or "OK" as response, so push a line read	723	# we expect "ERROR" or "OK" as response, so push a line read
500	$handle->push_read_line (sub {	724	$handle->push_read (line => sub {
501	# if we got an "OK", we have to _prepend_ another line,	725	# if we got an "OK", we have to _prepend_ another line,
502	# so it will be read before the second request reads its 64 bytes	726	# so it will be read before the second request reads its 64 bytes
503	# which are already in the queue when this callback is called	727	# which are already in the queue when this callback is called
504	# we don't do this in case we got an error	728	# we don't do this in case we got an error
505	if ($_[1] eq "OK") {	729	if ($_[1] eq "OK") {
506	$_[0]->unshift_read_line (sub {	730	$_[0]->unshift_read (line => sub {
507	my $response = $_[1];	731	my $response = $_[1];
508	...	732	...
509	});	733	});
510	}	734	}
511	});	735	});
512		736
513	# request two	737	# request two, simply returns 64 octets
514	$handle->push_write ("request 2\015\012");	738	$handle->push_write ("request 2\015\012");
515		739
516	# simply read 64 bytes, always	740	# simply read 64 bytes, always
517	$handle->push_read_chunk (64, sub {	741	$handle->push_read (chunk => 64, sub {
518	my $response = $_[1];	742	my $response = $_[1];
519	...	743	...
520	});	744	});
521		745
522	=over 4	746	=over 4
523		747
524	=cut	748	=cut
525		749
526	sub _drain_rbuf {	750	sub _drain_rbuf {
527	my ($self) = @_;	751	my ($self) = @_;
		752
		753	local $self->{_in_drain} = 1;
528		754
529	if (	755	if (
530	defined $self->{rbuf_max}	756	defined $self->{rbuf_max}
531	&& $self->{rbuf_max} < length $self->{rbuf}	757	&& $self->{rbuf_max} < length $self->{rbuf}
532	) {	758	) {
533	$! = &Errno::ENOSPC;	759	$self->_error (&Errno::ENOSPC, 1), return;
534	$self->error;
535	}	760	}
536		761
537	return if $self->{in_drain};	762	while () {
538	local $self->{in_drain} = 1;
539
540	while (my $len = length $self->{rbuf}) {	763	my $len = length $self->{rbuf};
541	no strict 'refs';	764
542	if (my $cb = shift @{ $self->{_queue} }) {	765	if (my $cb = shift @{ $self->{_queue} }) {
543	unless ($cb->($self)) {	766	unless ($cb->($self)) {
544	if ($self->{_eof}) {	767	if ($self->{_eof}) {
545	# no progress can be made (not enough data and no data forthcoming)	768	# no progress can be made (not enough data and no data forthcoming)
546	$! = &Errno::EPIPE;	769	$self->_error (&Errno::EPIPE, 1), return;
547	$self->error;
548	}	770	}
549		771
550	unshift @{ $self->{_queue} }, $cb;	772	unshift @{ $self->{_queue} }, $cb;
551	return;	773	last;
552	}	774	}
553	} elsif ($self->{on_read}) {	775	} elsif ($self->{on_read}) {
		776	last unless $len;
		777
554	$self->{on_read}($self);	778	$self->{on_read}($self);
555		779
556	if (	780	if (
557	$self->{_eof} # if no further data will arrive
558	&& $len == length $self->{rbuf} # and no data has been consumed	781	$len == length $self->{rbuf} # if no data has been consumed
559	&& !@{ $self->{_queue} } # and the queue is still empty	782	&& !@{ $self->{_queue} } # and the queue is still empty
560	&& $self->{on_read} # and we still want to read data	783	&& $self->{on_read} # but we still have on_read
561	) {	784	) {
		785	# no further data will arrive
562	# then no progress can be made	786	# so no progress can be made
563	$! = &Errno::EPIPE;	787	$self->_error (&Errno::EPIPE, 1), return
564	$self->error;	788	if $self->{_eof};
		789
		790	last; # more data might arrive
565	}	791	}
566	} else {	792	} else {
567	# read side becomes idle	793	# read side becomes idle
568	delete $self->{_rw};	794	delete $self->{_rw} unless $self->{tls};
569	return;	795	last;
570	}	796	}
571	}	797	}
572		798
573	if ($self->{_eof}) {	799	if ($self->{_eof}) {
574	$self->_shutdown;	800	if ($self->{on_eof}) {
575	$self->{on_eof}($self)	801	$self->{on_eof}($self)
576	if $self->{on_eof};	802	} else {
		803	$self->_error (0, 1);
		804	}
		805	}
		806
		807	# may need to restart read watcher
		808	unless ($self->{_rw}) {
		809	$self->start_read
		810	if $self->{on_read} \|\| @{ $self->{_queue} };
577	}	811	}
578	}	812	}
579		813
580	=item $handle->on_read ($cb)	814	=item $handle->on_read ($cb)
581		815
…		…
587		821
588	sub on_read {	822	sub on_read {
589	my ($self, $cb) = @_;	823	my ($self, $cb) = @_;
590		824
591	$self->{on_read} = $cb;	825	$self->{on_read} = $cb;
		826	$self->_drain_rbuf if $cb && !$self->{_in_drain};
592	}	827	}
593		828
594	=item $handle->rbuf	829	=item $handle->rbuf
595		830
596	Returns the read buffer (as a modifiable lvalue).	831	Returns the read buffer (as a modifiable lvalue).
…		…
645	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read")	880	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read")
646	->($self, $cb, @_);	881	->($self, $cb, @_);
647	}	882	}
648		883
649	push @{ $self->{_queue} }, $cb;	884	push @{ $self->{_queue} }, $cb;
650	$self->_drain_rbuf;	885	$self->_drain_rbuf unless $self->{_in_drain};
651	}	886	}
652		887
653	sub unshift_read {	888	sub unshift_read {
654	my $self = shift;	889	my $self = shift;
655	my $cb = pop;	890	my $cb = pop;
…		…
661	->($self, $cb, @_);	896	->($self, $cb, @_);
662	}	897	}
663		898
664		899
665	unshift @{ $self->{_queue} }, $cb;	900	unshift @{ $self->{_queue} }, $cb;
666	$self->_drain_rbuf;	901	$self->_drain_rbuf unless $self->{_in_drain};
667	}	902	}
668		903
669	=item $handle->push_read (type => @args, $cb)	904	=item $handle->push_read (type => @args, $cb)
670		905
671	=item $handle->unshift_read (type => @args, $cb)	906	=item $handle->unshift_read (type => @args, $cb)
…		…
701	$cb->($_[0], substr $_[0]{rbuf}, 0, $len, "");	936	$cb->($_[0], substr $_[0]{rbuf}, 0, $len, "");
702	1	937	1
703	}	938	}
704	};	939	};
705		940
706	# compatibility with older API
707	sub push_read_chunk {
708	$_[0]->push_read (chunk => $_[1], $_[2]);
709	}
710
711	sub unshift_read_chunk {
712	$_[0]->unshift_read (chunk => $_[1], $_[2]);
713	}
714
715	=item line => [$eol, ]$cb->($handle, $line, $eol)	941	=item line => [$eol, ]$cb->($handle, $line, $eol)
716		942
717	The callback will be called only once a full line (including the end of	943	The callback will be called only once a full line (including the end of
718	line marker, C<$eol>) has been read. This line (excluding the end of line	944	line marker, C<$eol>) has been read. This line (excluding the end of line
719	marker) will be passed to the callback as second argument (C<$line>), and	945	marker) will be passed to the callback as second argument (C<$line>), and
…		…
734	=cut	960	=cut
735		961
736	register_read_type line => sub {	962	register_read_type line => sub {
737	my ($self, $cb, $eol) = @_;	963	my ($self, $cb, $eol) = @_;
738		964
739	$eol = qr\|(\015?\012)\| if @_ < 3;	965	if (@_ < 3) {
740	$eol = quotemeta $eol unless ref $eol;	966	# this is more than twice as fast as the generic code below
741	$eol = qr\|^(.*?)($eol)\|s;
742
743	sub {	967	sub {
744	$_[0]{rbuf} =~ s/$eol// or return;	968	$_[0]{rbuf} =~ s/^([^\015\012]*)(\015?\012)// or return;
745		969
746	$cb->($_[0], $1, $2);	970	$cb->($_[0], $1, $2);
747	1
748	}
749	};
750
751	# compatibility with older API
752	sub push_read_line {
753	my $self = shift;
754	$self->push_read (line => @_);
755	}
756
757	sub unshift_read_line {
758	my $self = shift;
759	$self->unshift_read (line => @_);
760	}
761
762	=item netstring => $cb->($handle, $string)
763
764	A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement).
765
766	Throws an error with C<$!> set to EBADMSG on format violations.
767
768	=cut
769
770	register_read_type netstring => sub {
771	my ($self, $cb) = @_;
772
773	sub {
774	unless ($_[0]{rbuf} =~ s/^(0\|[1-9][0-9]*)://) {
775	if ($_[0]{rbuf} =~ /[^0-9]/) {
776	$! = &Errno::EBADMSG;
777	$self->error;
778	}	971	1
779	return;
780	}	972	}
		973	} else {
		974	$eol = quotemeta $eol unless ref $eol;
		975	$eol = qr\|^(.*?)($eol)\|s;
781		976
782	my $len = $1;	977	sub {
		978	$_[0]{rbuf} =~ s/$eol// or return;
783		979
784	$self->unshift_read (chunk => $len, sub {	980	$cb->($_[0], $1, $2);
785	my $string = $_[1];
786	$_[0]->unshift_read (chunk => 1, sub {
787	if ($_[1] eq ",") {
788	$cb->($_[0], $string);
789	} else {
790	$! = &Errno::EBADMSG;
791	$self->error;
792	}
793	});	981	1
794	});	982	}
795
796	1
797	}	983	}
798	};	984	};
799		985
800	=item regex => $accept[, $reject[, $skip], $cb->($handle, $data)	986	=item regex => $accept[, $reject[, $skip], $cb->($handle, $data)
801		987
…		…
853	return 1;	1039	return 1;
854	}	1040	}
855		1041
856	# reject	1042	# reject
857	if ($reject && $$rbuf =~ $reject) {	1043	if ($reject && $$rbuf =~ $reject) {
858	$! = &Errno::EBADMSG;	1044	$self->_error (&Errno::EBADMSG);
859	$self->error;
860	}	1045	}
861		1046
862	# skip	1047	# skip
863	if ($skip && $$rbuf =~ $skip) {	1048	if ($skip && $$rbuf =~ $skip) {
864	$data .= substr $$rbuf, 0, $+[0], "";	1049	$data .= substr $$rbuf, 0, $+[0], "";
…		…
866		1051
867	()	1052	()
868	}	1053	}
869	};	1054	};
870		1055
		1056	=item netstring => $cb->($handle, $string)
		1057
		1058	A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement).
		1059
		1060	Throws an error with C<$!> set to EBADMSG on format violations.
		1061
		1062	=cut
		1063
		1064	register_read_type netstring => sub {
		1065	my ($self, $cb) = @_;
		1066
		1067	sub {
		1068	unless ($_[0]{rbuf} =~ s/^(0\|[1-9][0-9]*)://) {
		1069	if ($_[0]{rbuf} =~ /[^0-9]/) {
		1070	$self->_error (&Errno::EBADMSG);
		1071	}
		1072	return;
		1073	}
		1074
		1075	my $len = $1;
		1076
		1077	$self->unshift_read (chunk => $len, sub {
		1078	my $string = $_[1];
		1079	$_[0]->unshift_read (chunk => 1, sub {
		1080	if ($_[1] eq ",") {
		1081	$cb->($_[0], $string);
		1082	} else {
		1083	$self->_error (&Errno::EBADMSG);
		1084	}
		1085	});
		1086	});
		1087
		1088	1
		1089	}
		1090	};
		1091
		1092	=item packstring => $format, $cb->($handle, $string)
		1093
		1094	An octet string prefixed with an encoded length. The encoding C<$format>
		1095	uses the same format as a Perl C<pack> format, but must specify a single
		1096	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an
		1097	optional C<!>, C<< < >> or C<< > >> modifier).
		1098
		1099	For example, DNS over TCP uses a prefix of C<n> (2 octet network order),
		1100	EPP uses a prefix of C<N> (4 octtes).
		1101
		1102	Example: read a block of data prefixed by its length in BER-encoded
		1103	format (very efficient).
		1104
		1105	$handle->push_read (packstring => "w", sub {
		1106	my ($handle, $data) = @_;
		1107	});
		1108
		1109	=cut
		1110
		1111	register_read_type packstring => sub {
		1112	my ($self, $cb, $format) = @_;
		1113
		1114	sub {
		1115	# when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method
		1116	defined (my $len = eval { unpack $format, $_[0]{rbuf} })
		1117	or return;
		1118
		1119	$format = length pack $format, $len;
		1120
		1121	# bypass unshift if we already have the remaining chunk
		1122	if ($format + $len <= length $_[0]{rbuf}) {
		1123	my $data = substr $_[0]{rbuf}, $format, $len;
		1124	substr $_[0]{rbuf}, 0, $format + $len, "";
		1125	$cb->($_[0], $data);
		1126	} else {
		1127	# remove prefix
		1128	substr $_[0]{rbuf}, 0, $format, "";
		1129
		1130	# read remaining chunk
		1131	$_[0]->unshift_read (chunk => $len, $cb);
		1132	}
		1133
		1134	1
		1135	}
		1136	};
		1137
871	=item json => $cb->($handle, $hash_or_arrayref)	1138	=item json => $cb->($handle, $hash_or_arrayref)
872		1139
873	Reads a JSON object or array, decodes it and passes it to the callback.	1140	Reads a JSON object or array, decodes it and passes it to the callback.
874		1141
875	If a C<json> object was passed to the constructor, then that will be used	1142	If a C<json> object was passed to the constructor, then that will be used
…		…
885	the C<json> write type description, above, for an actual example.	1152	the C<json> write type description, above, for an actual example.
886		1153
887	=cut	1154	=cut
888		1155
889	register_read_type json => sub {	1156	register_read_type json => sub {
890	my ($self, $cb, $accept, $reject, $skip) = @_;	1157	my ($self, $cb) = @_;
891		1158
892	require JSON;	1159	require JSON;
893		1160
894	my $data;	1161	my $data;
895	my $rbuf = \$self->{rbuf};	1162	my $rbuf = \$self->{rbuf};
…		…
910	()	1177	()
911	}	1178	}
912	}	1179	}
913	};	1180	};
914		1181
		1182	=item storable => $cb->($handle, $ref)
		1183
		1184	Deserialises a L<Storable> frozen representation as written by the
		1185	C<storable> write type (BER-encoded length prefix followed by nfreeze'd
		1186	data).
		1187
		1188	Raises C<EBADMSG> error if the data could not be decoded.
		1189
		1190	=cut
		1191
		1192	register_read_type storable => sub {
		1193	my ($self, $cb) = @_;
		1194
		1195	require Storable;
		1196
		1197	sub {
		1198	# when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method
		1199	defined (my $len = eval { unpack "w", $_[0]{rbuf} })
		1200	or return;
		1201
		1202	my $format = length pack "w", $len;
		1203
		1204	# bypass unshift if we already have the remaining chunk
		1205	if ($format + $len <= length $_[0]{rbuf}) {
		1206	my $data = substr $_[0]{rbuf}, $format, $len;
		1207	substr $_[0]{rbuf}, 0, $format + $len, "";
		1208	$cb->($_[0], Storable::thaw ($data));
		1209	} else {
		1210	# remove prefix
		1211	substr $_[0]{rbuf}, 0, $format, "";
		1212
		1213	# read remaining chunk
		1214	$_[0]->unshift_read (chunk => $len, sub {
		1215	if (my $ref = eval { Storable::thaw ($_[1]) }) {
		1216	$cb->($_[0], $ref);
		1217	} else {
		1218	$self->_error (&Errno::EBADMSG);
		1219	}
		1220	});
		1221	}
		1222
		1223	1
		1224	}
		1225	};
		1226
915	=back	1227	=back
916		1228
917	=item AnyEvent::Handle::register_read_type type => $coderef->($handle, $cb, @args)	1229	=item AnyEvent::Handle::register_read_type type => $coderef->($handle, $cb, @args)
918		1230
919	This function (not method) lets you add your own types to C<push_read>.	1231	This function (not method) lets you add your own types to C<push_read>.
…		…
937	=item $handle->stop_read	1249	=item $handle->stop_read
938		1250
939	=item $handle->start_read	1251	=item $handle->start_read
940		1252
941	In rare cases you actually do not want to read anything from the	1253	In rare cases you actually do not want to read anything from the
942	socket. In this case you can call C<stop_read>. Neither C<on_read> no	1254	socket. In this case you can call C<stop_read>. Neither C<on_read> nor
943	any queued callbacks will be executed then. To start reading again, call	1255	any queued callbacks will be executed then. To start reading again, call
944	C<start_read>.	1256	C<start_read>.
945		1257
		1258	Note that AnyEvent::Handle will automatically C<start_read> for you when
		1259	you change the C<on_read> callback or push/unshift a read callback, and it
		1260	will automatically C<stop_read> for you when neither C<on_read> is set nor
		1261	there are any read requests in the queue.
		1262
		1263	These methods will have no effect when in TLS mode (as TLS doesn't support
		1264	half-duplex connections).
		1265
946	=cut	1266	=cut
947		1267
948	sub stop_read {	1268	sub stop_read {
949	my ($self) = @_;	1269	my ($self) = @_;
950		1270
951	delete $self->{_rw};	1271	delete $self->{_rw} unless $self->{tls};
952	}	1272	}
953		1273
954	sub start_read {	1274	sub start_read {
955	my ($self) = @_;	1275	my ($self) = @_;
956		1276
957	unless ($self->{_rw} \|\| $self->{_eof}) {	1277	unless ($self->{_rw} \|\| $self->{_eof}) {
958	Scalar::Util::weaken $self;	1278	Scalar::Util::weaken $self;
959		1279
960	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {	1280	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {
961	my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf};	1281	my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});
962	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} \|\| 8192, length $$rbuf;	1282	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} \|\| 8192, length $$rbuf;
963		1283
964	if ($len > 0) {	1284	if ($len > 0) {
965	$self->{filter_r}	1285	$self->{_activity} = AnyEvent->now;
966	? $self->{filter_r}->($self, $rbuf)	1286
967	: $self->_drain_rbuf;	1287	if ($self->{tls}) {
		1288	Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);
		1289
		1290	&_dotls ($self);
		1291	} else {
		1292	$self->_drain_rbuf unless $self->{_in_drain};
		1293	}
968		1294
969	} elsif (defined $len) {	1295	} elsif (defined $len) {
970	delete $self->{_rw};	1296	delete $self->{_rw};
971	$self->{_eof} = 1;	1297	$self->{_eof} = 1;
972	$self->_drain_rbuf;	1298	$self->_drain_rbuf unless $self->{_in_drain};
973		1299
974	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	1300	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
975	return $self->error;	1301	return $self->_error ($!, 1);
976	}	1302	}
977	});	1303	});
978	}	1304	}
979	}	1305	}
980		1306
		1307	# poll the write BIO and send the data if applicable
981	sub _dotls {	1308	sub _dotls {
982	my ($self) = @_;	1309	my ($self) = @_;
983		1310
		1311	my $tmp;
		1312
984	if (length $self->{_tls_wbuf}) {	1313	if (length $self->{_tls_wbuf}) {
985	while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {	1314	while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {
986	substr $self->{_tls_wbuf}, 0, $len, "";	1315	substr $self->{_tls_wbuf}, 0, $tmp, "";
987	}	1316	}
988	}	1317	}
989		1318
		1319	while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) {
		1320	unless (length $tmp) {
		1321	# let's treat SSL-eof as we treat normal EOF
		1322	delete $self->{_rw};
		1323	$self->{_eof} = 1;
		1324	&_freetls;
		1325	}
		1326
		1327	$self->{rbuf} .= $tmp;
		1328	$self->_drain_rbuf unless $self->{_in_drain};
		1329	$self->{tls} or return; # tls session might have gone away in callback
		1330	}
		1331
		1332	$tmp = Net::SSLeay::get_error ($self->{tls}, -1);
		1333
		1334	if ($tmp != Net::SSLeay::ERROR_WANT_READ ()) {
		1335	if ($tmp == Net::SSLeay::ERROR_SYSCALL ()) {
		1336	return $self->_error ($!, 1);
		1337	} elsif ($tmp == Net::SSLeay::ERROR_SSL ()) {
		1338	return $self->_error (&Errno::EIO, 1);
		1339	}
		1340
		1341	# all other errors are fine for our purposes
		1342	}
		1343
990	if (defined (my $buf = Net::SSLeay::BIO_read ($self->{_wbio}))) {	1344	while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) {
991	$self->{wbuf} .= $buf;	1345	$self->{wbuf} .= $tmp;
992	$self->_drain_wbuf;	1346	$self->_drain_wbuf;
993	}
994
995	while (defined (my $buf = Net::SSLeay::read ($self->{tls}))) {
996	$self->{rbuf} .= $buf;
997	$self->_drain_rbuf;
998	}
999
1000	my $err = Net::SSLeay::get_error ($self->{tls}, -1);
1001
1002	if ($err!= Net::SSLeay::ERROR_WANT_READ ()) {
1003	if ($err == Net::SSLeay::ERROR_SYSCALL ()) {
1004	$self->error;
1005	} elsif ($err == Net::SSLeay::ERROR_SSL ()) {
1006	$! = &Errno::EIO;
1007	$self->error;
1008	}
1009
1010	# all others are fine for our purposes
1011	}	1347	}
1012	}	1348	}
1013		1349
1014	=item $handle->starttls ($tls[, $tls_ctx])	1350	=item $handle->starttls ($tls[, $tls_ctx])
1015		1351
…		…
1025		1361
1026	The TLS connection object will end up in C<< $handle->{tls} >> after this	1362	The TLS connection object will end up in C<< $handle->{tls} >> after this
1027	call and can be used or changed to your liking. Note that the handshake	1363	call and can be used or changed to your liking. Note that the handshake
1028	might have already started when this function returns.	1364	might have already started when this function returns.
1029		1365
1030	=cut	1366	If it an error to start a TLS handshake more than once per
		1367	AnyEvent::Handle object (this is due to bugs in OpenSSL).
1031		1368
1032	# TODO: maybe document...	1369	=cut
		1370
1033	sub starttls {	1371	sub starttls {
1034	my ($self, $ssl, $ctx) = @_;	1372	my ($self, $ssl, $ctx) = @_;
1035		1373
1036	$self->stoptls;	1374	require Net::SSLeay;
1037		1375
		1376	Carp::croak "it is an error to call starttls more than once on an Anyevent::Handle object"
		1377	if $self->{tls};
		1378
1038	if ($ssl eq "accept") {	1379	if ($ssl eq "accept") {
1039	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());	1380	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());
1040	Net::SSLeay::set_accept_state ($ssl);	1381	Net::SSLeay::set_accept_state ($ssl);
1041	} elsif ($ssl eq "connect") {	1382	} elsif ($ssl eq "connect") {
1042	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());	1383	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());
…		…
1048	# basically, this is deep magic (because SSL_read should have the same issues)	1389	# basically, this is deep magic (because SSL_read should have the same issues)
1049	# but the openssl maintainers basically said: "trust us, it just works".	1390	# but the openssl maintainers basically said: "trust us, it just works".
1050	# (unfortunately, we have to hardcode constants because the abysmally misdesigned	1391	# (unfortunately, we have to hardcode constants because the abysmally misdesigned
1051	# and mismaintained ssleay-module doesn't even offer them).	1392	# and mismaintained ssleay-module doesn't even offer them).
1052	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html	1393	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html
		1394	#
		1395	# in short: this is a mess.
		1396	#
		1397	# note that we do not try to keep the length constant between writes as we are required to do.
		1398	# we assume that most (but not all) of this insanity only applies to non-blocking cases,
		1399	# and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to
		1400	# have identity issues in that area.
1053	Net::SSLeay::CTX_set_mode ($self->{tls},	1401	Net::SSLeay::CTX_set_mode ($self->{tls},
1054	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } \|\| 1)	1402	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } \|\| 1)
1055	\| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } \|\| 2));	1403	\| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } \|\| 2));
1056		1404
1057	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1405	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1058	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1406	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1059		1407
1060	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});	1408	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});
1061		1409
1062	$self->{filter_w} = sub {	1410	&_dotls; # need to trigger the initial handshake
1063	$_[0]{_tls_wbuf} .= ${$_[1]};	1411	$self->start_read; # make sure we actually do read
1064	&_dotls;
1065	};
1066	$self->{filter_r} = sub {
1067	Net::SSLeay::BIO_write ($_[0]{_rbio}, ${$_[1]});
1068	&_dotls;
1069	};
1070	}	1412	}
1071		1413
1072	=item $handle->stoptls	1414	=item $handle->stoptls
1073		1415
1074	Destroys the SSL connection, if any. Partial read or write data will be	1416	Shuts down the SSL connection - this makes a proper EOF handshake by
1075	lost.	1417	sending a close notify to the other side, but since OpenSSL doesn't
		1418	support non-blocking shut downs, it is not possible to re-use the stream
		1419	afterwards.
1076		1420
1077	=cut	1421	=cut
1078		1422
1079	sub stoptls {	1423	sub stoptls {
1080	my ($self) = @_;	1424	my ($self) = @_;
1081		1425
		1426	if ($self->{tls}) {
		1427	Net::SSLeay::shutdown ($self->{tls});
		1428
		1429	&_dotls;
		1430
		1431	# we don't give a shit. no, we do, but we can't. no...
		1432	# we, we... have to use openssl :/
		1433	&_freetls;
		1434	}
		1435	}
		1436
		1437	sub _freetls {
		1438	my ($self) = @_;
		1439
		1440	return unless $self->{tls};
		1441
1082	Net::SSLeay::free (delete $self->{tls}) if $self->{tls};	1442	Net::SSLeay::free (delete $self->{tls});
1083		1443
1084	delete $self->{_rbio};	1444	delete @$self{qw(_rbio _wbio _tls_wbuf)};
1085	delete $self->{_wbio};
1086	delete $self->{_tls_wbuf};
1087	delete $self->{filter_r};
1088	delete $self->{filter_w};
1089	}	1445	}
1090		1446
1091	sub DESTROY {	1447	sub DESTROY {
1092	my $self = shift;	1448	my $self = shift;
1093		1449
1094	$self->stoptls;	1450	&_freetls;
		1451
		1452	my $linger = exists $self->{linger} ? $self->{linger} : 3600;
		1453
		1454	if ($linger && length $self->{wbuf}) {
		1455	my $fh = delete $self->{fh};
		1456	my $wbuf = delete $self->{wbuf};
		1457
		1458	my @linger;
		1459
		1460	push @linger, AnyEvent->io (fh => $fh, poll => "w", cb => sub {
		1461	my $len = syswrite $fh, $wbuf, length $wbuf;
		1462
		1463	if ($len > 0) {
		1464	substr $wbuf, 0, $len, "";
		1465	} else {
		1466	@linger = (); # end
		1467	}
		1468	});
		1469	push @linger, AnyEvent->timer (after => $linger, cb => sub {
		1470	@linger = ();
		1471	});
		1472	}
		1473	}
		1474
		1475	=item $handle->destroy
		1476
		1477	Shut's down the handle object as much as possible - this call ensures that
		1478	no further callbacks will be invoked and resources will be freed as much
		1479	as possible. You must not call any methods on the object afterwards.
		1480
		1481	The handle might still linger in the background and write out remaining
		1482	data, as specified by the C<linger> option, however.
		1483
		1484	=cut
		1485
		1486	sub destroy {
		1487	my ($self) = @_;
		1488
		1489	$self->DESTROY;
		1490	%$self = ();
1095	}	1491	}
1096		1492
1097	=item AnyEvent::Handle::TLS_CTX	1493	=item AnyEvent::Handle::TLS_CTX
1098		1494
1099	This function creates and returns the Net::SSLeay::CTX object used by	1495	This function creates and returns the Net::SSLeay::CTX object used by
…		…
1129	}	1525	}
1130	}	1526	}
1131		1527
1132	=back	1528	=back
1133		1529
		1530
		1531	=head1 NONFREQUENTLY ASKED QUESTIONS
		1532
		1533	=over 4
		1534
		1535	=item How do I read data until the other side closes the connection?
		1536
		1537	If you just want to read your data into a perl scalar, the easiest way
		1538	to achieve this is by setting an C<on_read> callback that does nothing,
		1539	clearing the C<on_eof> callback and in the C<on_error> callback, the data
		1540	will be in C<$_[0]{rbuf}>:
		1541
		1542	$handle->on_read (sub { });
		1543	$handle->on_eof (undef);
		1544	$handle->on_error (sub {
		1545	my $data = delete $_[0]{rbuf};
		1546	undef $handle;
		1547	});
		1548
		1549	The reason to use C<on_error> is that TCP connections, due to latencies
		1550	and packets loss, might get closed quite violently with an error, when in
		1551	fact, all data has been received.
		1552
		1553	It is usually better to use acknowledgements when transfering data,
		1554	to make sure the other side hasn't just died and you got the data
		1555	intact. This is also one reason why so many internet protocols have an
		1556	explicit QUIT command.
		1557
		1558
		1559	=item I don't want to destroy the handle too early - how do I wait until
		1560	all data has been written?
		1561
		1562	After writing your last bits of data, set the C<on_drain> callback
		1563	and destroy the handle in there - with the default setting of
		1564	C<low_water_mark> this will be called precisely when all data has been
		1565	written to the socket:
		1566
		1567	$handle->push_write (...);
		1568	$handle->on_drain (sub {
		1569	warn "all data submitted to the kernel\n";
		1570	undef $handle;
		1571	});
		1572
		1573	=item I get different callback invocations in TLS mode/Why can't I pause
		1574	reading?
		1575
		1576	Unlike, say, TCP, TLS conenctions do not consist of two independent
		1577	communication channels, one for each direction. Or put differently. the
		1578	read and write directions are not independent of each other: you cannot
		1579	write data unless you are also prepared to read, and vice versa.
		1580
		1581	This can mean than, in TLS mode, you might get C<on_error> or C<on_eof>
		1582	callback invocations when you are not expecting any read data - the reason
		1583	is that AnyEvent::Handle always reads in TLS mode.
		1584
		1585	During the connection, you have to make sure that you always have a
		1586	non-empty read-queue, or an C<on_read> watcher. At the end of the
		1587	connection (or when you no longer want to use it) you can call the
		1588	C<destroy> method.
		1589
		1590	=back
		1591
		1592
1134	=head1 SUBCLASSING AnyEvent::Handle	1593	=head1 SUBCLASSING AnyEvent::Handle
1135		1594
1136	In many cases, you might want to subclass AnyEvent::Handle.	1595	In many cases, you might want to subclass AnyEvent::Handle.
1137		1596
1138	To make this easier, a given version of AnyEvent::Handle uses these	1597	To make this easier, a given version of AnyEvent::Handle uses these
…		…
1141	=over 4	1600	=over 4
1142		1601
1143	=item * all constructor arguments become object members.	1602	=item * all constructor arguments become object members.
1144		1603
1145	At least initially, when you pass a C<tls>-argument to the constructor it	1604	At least initially, when you pass a C<tls>-argument to the constructor it
1146	will end up in C<< $handle->{tls} >>. Those members might be changes or	1605	will end up in C<< $handle->{tls} >>. Those members might be changed or
1147	mutated later on (for example C<tls> will hold the TLS connection object).	1606	mutated later on (for example C<tls> will hold the TLS connection object).
1148		1607
1149	=item * other object member names are prefixed with an C<_>.	1608	=item * other object member names are prefixed with an C<_>.
1150		1609
1151	All object members not explicitly documented (internal use) are prefixed	1610	All object members not explicitly documented (internal use) are prefixed

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Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents): Revision 1.42 by root, Tue May 27 06:23:15 2008 UTC vs. Revision 1.100 by root, Thu Oct 23 02:44:50 2008 UTC

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Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.42 by root, Tue May 27 06:23:15 2008 UTC vs.
Revision 1.100 by root, Thu Oct 23 02:44:50 2008 UTC