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

Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.18 by root, Sat May 24 05:01:16 2008 UTC vs.
Revision 1.62 by root, Fri Jun 6 10:49:20 2008 UTC

…		…
2		2
3	no warnings;	3	no warnings;
4	use strict;	4	use strict;
5		5
6	use AnyEvent ();	6	use AnyEvent ();
7	use AnyEvent::Util ();	7	use AnyEvent::Util qw(WSAEWOULDBLOCK);
8	use Scalar::Util ();	8	use Scalar::Util ();
9	use Carp ();	9	use Carp ();
10	use Fcntl ();	10	use Fcntl ();
11	use Errno qw/EAGAIN EINTR/;	11	use Errno qw(EAGAIN EINTR);
12		12
13	=head1 NAME	13	=head1 NAME
14		14
15	AnyEvent::Handle - non-blocking I/O on filehandles via AnyEvent	15	AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent
16		16
17	This module is experimental.
18
19	=cut	17	=cut
20		18
21	our $VERSION = '0.04';	19	our $VERSION = 4.14;
22		20
23	=head1 SYNOPSIS	21	=head1 SYNOPSIS
24		22
25	use AnyEvent;	23	use AnyEvent;
26	use AnyEvent::Handle;	24	use AnyEvent::Handle;
27		25
28	my $cv = AnyEvent->condvar;	26	my $cv = AnyEvent->condvar;
29		27
30	my $ae_fh = AnyEvent::Handle->new (fh => \*STDIN);	28	my $handle =
31
32	#TODO
33
34	# or use the constructor to pass the callback:
35
36	my $ae_fh2 =
37	AnyEvent::Handle->new (	29	AnyEvent::Handle->new (
38	fh => \*STDIN,	30	fh => \*STDIN,
39	on_eof => sub {	31	on_eof => sub {
40	$cv->broadcast;	32	$cv->broadcast;
41	},	33	},
42	#TODO
43	);	34	);
44		35
45	$cv->wait;	36	# send some request line
		37	$handle->push_write ("getinfo\015\012");
		38
		39	# read the response line
		40	$handle->push_read (line => sub {
		41	my ($handle, $line) = @_;
		42	warn "read line <$line>\n";
		43	$cv->send;
		44	});
		45
		46	$cv->recv;
46		47
47	=head1 DESCRIPTION	48	=head1 DESCRIPTION
48		49
49	This module is a helper module to make it easier to do event-based I/O on	50	This module is a helper module to make it easier to do event-based I/O on
50	filehandles. For utility functions for doing non-blocking connects and accepts	51	filehandles. For utility functions for doing non-blocking connects and accepts
…		…
72	The filehandle this L<AnyEvent::Handle> object will operate on.	73	The filehandle this L<AnyEvent::Handle> object will operate on.
73		74
74	NOTE: The filehandle will be set to non-blocking (using	75	NOTE: The filehandle will be set to non-blocking (using
75	AnyEvent::Util::fh_nonblocking).	76	AnyEvent::Util::fh_nonblocking).
76		77
77	=item on_eof => $cb->($self)	78	=item on_eof => $cb->($handle)
78		79
79	Set the callback to be called on EOF.	80	Set the callback to be called when an end-of-file condition is detcted,
		81	i.e. in the case of a socket, when the other side has closed the
		82	connection cleanly.
80		83
81	While not mandatory, it is highly recommended to set an eof callback,	84	While not mandatory, it is highly recommended to set an eof callback,
82	otherwise you might end up with a closed socket while you are still	85	otherwise you might end up with a closed socket while you are still
83	waiting for data.	86	waiting for data.
84		87
85	=item on_error => $cb->($self)	88	=item on_error => $cb->($handle, $fatal)
86		89
87	This is the fatal error callback, that is called when, well, a fatal error	90	This is the error callback, which is called when, well, some error
88	ocurs, such as not being able to resolve the hostname, failure to connect	91	occured, such as not being able to resolve the hostname, failure to
89	or a read error.	92	connect or a read error.
90		93
91	The object will not be in a usable state when this callback has been	94	Some errors are fatal (which is indicated by C<$fatal> being true). On
92	called.	95	fatal errors the handle object will be shut down and will not be
		96	usable. Non-fatal errors can be retried by simply returning, but it is
		97	recommended to simply ignore this parameter and instead abondon the handle
		98	object when this callback is invoked.
93		99
94	On callback entrance, the value of C<$!> contains the operating system	100	On callback entrance, the value of C<$!> contains the operating system
95	error (or C<ENOSPC> or C<EPIPE>).	101	error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>).
96		102
97	While not mandatory, it is I<highly> recommended to set this callback, as	103	While not mandatory, it is I<highly> recommended to set this callback, as
98	you will not be notified of errors otherwise. The default simply calls	104	you will not be notified of errors otherwise. The default simply calls
99	die.	105	C<croak>.
100		106
101	=item on_read => $cb->($self)	107	=item on_read => $cb->($handle)
102		108
103	This sets the default read callback, which is called when data arrives	109	This sets the default read callback, which is called when data arrives
104	and no read request is in the queue.	110	and no read request is in the queue (unlike read queue callbacks, this
		111	callback will only be called when at least one octet of data is in the
		112	read buffer).
105		113
106	To access (and remove data from) the read buffer, use the C<< ->rbuf >>	114	To access (and remove data from) the read buffer, use the C<< ->rbuf >>
107	method or acces sthe C<$self->{rbuf}> member directly.	115	method or access the C<$handle->{rbuf}> member directly.
108		116
109	When an EOF condition is detected then AnyEvent::Handle will first try to	117	When an EOF condition is detected then AnyEvent::Handle will first try to
110	feed all the remaining data to the queued callbacks and C<on_read> before	118	feed all the remaining data to the queued callbacks and C<on_read> before
111	calling the C<on_eof> callback. If no progress can be made, then a fatal	119	calling the C<on_eof> callback. If no progress can be made, then a fatal
112	error will be raised (with C<$!> set to C<EPIPE>).	120	error will be raised (with C<$!> set to C<EPIPE>).
113		121
114	=item on_drain => $cb->()	122	=item on_drain => $cb->($handle)
115		123
116	This sets the callback that is called when the write buffer becomes empty	124	This sets the callback that is called when the write buffer becomes empty
117	(or when the callback is set and the buffer is empty already).	125	(or when the callback is set and the buffer is empty already).
118		126
119	To append to the write buffer, use the C<< ->push_write >> method.	127	To append to the write buffer, use the C<< ->push_write >> method.
		128
		129	=item timeout => $fractional_seconds
		130
		131	If non-zero, then this enables an "inactivity" timeout: whenever this many
		132	seconds pass without a successful read or write on the underlying file
		133	handle, the C<on_timeout> callback will be invoked (and if that one is
		134	missing, an C<ETIMEDOUT> error will be raised).
		135
		136	Note that timeout processing is also active when you currently do not have
		137	any outstanding read or write requests: If you plan to keep the connection
		138	idle then you should disable the timout temporarily or ignore the timeout
		139	in the C<on_timeout> callback.
		140
		141	Zero (the default) disables this timeout.
		142
		143	=item on_timeout => $cb->($handle)
		144
		145	Called whenever the inactivity timeout passes. If you return from this
		146	callback, then the timeout will be reset as if some activity had happened,
		147	so this condition is not fatal in any way.
120		148
121	=item rbuf_max => <bytes>	149	=item rbuf_max => <bytes>
122		150
123	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)	151	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)
124	when the read buffer ever (strictly) exceeds this size. This is useful to	152	when the read buffer ever (strictly) exceeds this size. This is useful to
…		…
131	isn't finished).	159	isn't finished).
132		160
133	=item read_size => <bytes>	161	=item read_size => <bytes>
134		162
135	The default read block size (the amount of bytes this module will try to read	163	The default read block size (the amount of bytes this module will try to read
136	on each [loop iteration). Default: C<4096>.	164	during each (loop iteration). Default: C<8192>.
137		165
138	=item low_water_mark => <bytes>	166	=item low_water_mark => <bytes>
139		167
140	Sets the amount of bytes (default: C<0>) that make up an "empty" write	168	Sets the amount of bytes (default: C<0>) that make up an "empty" write
141	buffer: If the write reaches this size or gets even samller it is	169	buffer: If the write reaches this size or gets even samller it is
142	considered empty.	170	considered empty.
143		171
		172	=item linger => <seconds>
		173
		174	If non-zero (default: C<3600>), then the destructor of the
		175	AnyEvent::Handle object will check wether there is still outstanding write
		176	data and will install a watcher that will write out this data. No errors
		177	will be reported (this mostly matches how the operating system treats
		178	outstanding data at socket close time).
		179
		180	This will not work for partial TLS data that could not yet been
		181	encoded. This data will be lost.
		182
		183	=item tls => "accept" \| "connect" \| Net::SSLeay::SSL object
		184
		185	When this parameter is given, it enables TLS (SSL) mode, that means it
		186	will start making tls handshake and will transparently encrypt/decrypt
		187	data.
		188
		189	TLS mode requires Net::SSLeay to be installed (it will be loaded
		190	automatically when you try to create a TLS handle).
		191
		192	For the TLS server side, use C<accept>, and for the TLS client side of a
		193	connection, use C<connect> mode.
		194
		195	You can also provide your own TLS connection object, but you have
		196	to make sure that you call either C<Net::SSLeay::set_connect_state>
		197	or C<Net::SSLeay::set_accept_state> on it before you pass it to
		198	AnyEvent::Handle.
		199
		200	See the C<starttls> method if you need to start TLs negotiation later.
		201
		202	=item tls_ctx => $ssl_ctx
		203
		204	Use the given Net::SSLeay::CTX object to create the new TLS connection
		205	(unless a connection object was specified directly). If this parameter is
		206	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.
		207
		208	=item json => JSON or JSON::XS object
		209
		210	This is the json coder object used by the C<json> read and write types.
		211
		212	If you don't supply it, then AnyEvent::Handle will create and use a
		213	suitable one, which will write and expect UTF-8 encoded JSON texts.
		214
		215	Note that you are responsible to depend on the JSON module if you want to
		216	use this functionality, as AnyEvent does not have a dependency itself.
		217
		218	=item filter_r => $cb
		219
		220	=item filter_w => $cb
		221
		222	These exist, but are undocumented at this time.
		223
144	=back	224	=back
145		225
146	=cut	226	=cut
147		227
148	sub new {	228	sub new {
…		…
152		232
153	$self->{fh} or Carp::croak "mandatory argument fh is missing";	233	$self->{fh} or Carp::croak "mandatory argument fh is missing";
154		234
155	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;	235	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;
156		236
157	$self->on_eof (delete $self->{on_eof} ) if $self->{on_eof};	237	if ($self->{tls}) {
158	$self->on_error (delete $self->{on_error}) if $self->{on_error};	238	require Net::SSLeay;
		239	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx});
		240	}
		241
		242	$self->{_activity} = AnyEvent->now;
		243	$self->_timeout;
		244
159	$self->on_drain (delete $self->{on_drain}) if $self->{on_drain};	245	$self->on_drain (delete $self->{on_drain}) if $self->{on_drain};
160	$self->on_read (delete $self->{on_read} ) if $self->{on_read};
161
162	$self->start_read;
163		246
164	$self	247	$self
165	}	248	}
166		249
167	sub _shutdown {	250	sub _shutdown {
168	my ($self) = @_;	251	my ($self) = @_;
169		252
		253	delete $self->{_tw};
170	delete $self->{rw};	254	delete $self->{_rw};
171	delete $self->{ww};	255	delete $self->{_ww};
172	delete $self->{fh};	256	delete $self->{fh};
173	}
174		257
		258	$self->stoptls;
		259	}
		260
175	sub error {	261	sub _error {
176	my ($self) = @_;	262	my ($self, $errno, $fatal) = @_;
177		263
178	{
179	local $!;
180	$self->_shutdown;	264	$self->_shutdown
181	}	265	if $fatal;
		266
		267	$! = $errno;
182		268
183	if ($self->{on_error}) {	269	if ($self->{on_error}) {
184	$self->{on_error}($self);	270	$self->{on_error}($self, $fatal);
185	} else {	271	} else {
186	die "AnyEvent::Handle uncaught fatal error: $!";	272	Carp::croak "AnyEvent::Handle uncaught error: $!";
187	}	273	}
188	}	274	}
189		275
190	=item $fh = $handle->fh	276	=item $fh = $handle->fh
191		277
192	This method returns the filehandle of the L<AnyEvent::Handle> object.	278	This method returns the file handle of the L<AnyEvent::Handle> object.
193		279
194	=cut	280	=cut
195		281
196	sub fh { $_[0]->{fh} }	282	sub fh { $_[0]{fh} }
197		283
198	=item $handle->on_error ($cb)	284	=item $handle->on_error ($cb)
199		285
200	Replace the current C<on_error> callback (see the C<on_error> constructor argument).	286	Replace the current C<on_error> callback (see the C<on_error> constructor argument).
201		287
…		…
213		299
214	sub on_eof {	300	sub on_eof {
215	$_[0]{on_eof} = $_[1];	301	$_[0]{on_eof} = $_[1];
216	}	302	}
217		303
		304	=item $handle->on_timeout ($cb)
		305
		306	Replace the current C<on_timeout> callback, or disables the callback
		307	(but not the timeout) if C<$cb> = C<undef>. See C<timeout> constructor
		308	argument.
		309
		310	=cut
		311
		312	sub on_timeout {
		313	$_[0]{on_timeout} = $_[1];
		314	}
		315
		316	#############################################################################
		317
		318	=item $handle->timeout ($seconds)
		319
		320	Configures (or disables) the inactivity timeout.
		321
		322	=cut
		323
		324	sub timeout {
		325	my ($self, $timeout) = @_;
		326
		327	$self->{timeout} = $timeout;
		328	$self->_timeout;
		329	}
		330
		331	# reset the timeout watcher, as neccessary
		332	# also check for time-outs
		333	sub _timeout {
		334	my ($self) = @_;
		335
		336	if ($self->{timeout}) {
		337	my $NOW = AnyEvent->now;
		338
		339	# when would the timeout trigger?
		340	my $after = $self->{_activity} + $self->{timeout} - $NOW;
		341
		342	# now or in the past already?
		343	if ($after <= 0) {
		344	$self->{_activity} = $NOW;
		345
		346	if ($self->{on_timeout}) {
		347	$self->{on_timeout}($self);
		348	} else {
		349	$self->_error (&Errno::ETIMEDOUT);
		350	}
		351
		352	# callback could have changed timeout value, optimise
		353	return unless $self->{timeout};
		354
		355	# calculate new after
		356	$after = $self->{timeout};
		357	}
		358
		359	Scalar::Util::weaken $self;
		360	return unless $self; # ->error could have destroyed $self
		361
		362	$self->{_tw} \|\|= AnyEvent->timer (after => $after, cb => sub {
		363	delete $self->{_tw};
		364	$self->_timeout;
		365	});
		366	} else {
		367	delete $self->{_tw};
		368	}
		369	}
		370
218	#############################################################################	371	#############################################################################
219		372
220	=back	373	=back
221		374
222	=head2 WRITE QUEUE	375	=head2 WRITE QUEUE
…		…
225	for reading.	378	for reading.
226		379
227	The write queue is very simple: you can add data to its end, and	380	The write queue is very simple: you can add data to its end, and
228	AnyEvent::Handle will automatically try to get rid of it for you.	381	AnyEvent::Handle will automatically try to get rid of it for you.
229		382
230	When data could be writtena nd the write buffer is shorter then the low	383	When data could be written and the write buffer is shorter then the low
231	water mark, the C<on_drain> callback will be invoked.	384	water mark, the C<on_drain> callback will be invoked.
232		385
233	=over 4	386	=over 4
234		387
235	=item $handle->on_drain ($cb)	388	=item $handle->on_drain ($cb)
…		…
257	=cut	410	=cut
258		411
259	sub _drain_wbuf {	412	sub _drain_wbuf {
260	my ($self) = @_;	413	my ($self) = @_;
261		414
262	unless ($self->{ww}) {	415	if (!$self->{_ww} && length $self->{wbuf}) {
		416
263	Scalar::Util::weaken $self;	417	Scalar::Util::weaken $self;
		418
264	my $cb = sub {	419	my $cb = sub {
265	my $len = syswrite $self->{fh}, $self->{wbuf};	420	my $len = syswrite $self->{fh}, $self->{wbuf};
266		421
267	if ($len > 0) {	422	if ($len >= 0) {
268	substr $self->{wbuf}, 0, $len, "";	423	substr $self->{wbuf}, 0, $len, "";
		424
		425	$self->{_activity} = AnyEvent->now;
269		426
270	$self->{on_drain}($self)	427	$self->{on_drain}($self)
271	if $self->{low_water_mark} >= length $self->{wbuf}	428	if $self->{low_water_mark} >= length $self->{wbuf}
272	&& $self->{on_drain};	429	&& $self->{on_drain};
273		430
274	delete $self->{ww} unless length $self->{wbuf};	431	delete $self->{_ww} unless length $self->{wbuf};
275	} elsif ($! != EAGAIN && $! != EINTR) {	432	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
276	$self->error;	433	$self->_error ($!, 1);
277	}	434	}
278	};	435	};
279		436
		437	# try to write data immediately
		438	$cb->();
		439
		440	# if still data left in wbuf, we need to poll
280	$self->{ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb);	441	$self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb)
281		442	if length $self->{wbuf};
282	$cb->($self);
283	};	443	};
		444	}
		445
		446	our %WH;
		447
		448	sub register_write_type($$) {
		449	$WH{$_[0]} = $_[1];
284	}	450	}
285		451
286	sub push_write {	452	sub push_write {
287	my $self = shift;	453	my $self = shift;
288		454
		455	if (@_ > 1) {
		456	my $type = shift;
		457
		458	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")
		459	->($self, @_);
		460	}
		461
289	if ($self->{filter_w}) {	462	if ($self->{filter_w}) {
290	$self->{filter_w}->($self, \$_[0]);	463	$self->{filter_w}($self, \$_[0]);
291	} else {	464	} else {
292	$self->{wbuf} .= $_[0];	465	$self->{wbuf} .= $_[0];
293	$self->_drain_wbuf;	466	$self->_drain_wbuf;
294	}	467	}
295	}	468	}
		469
		470	=item $handle->push_write (type => @args)
		471
		472	Instead of formatting your data yourself, you can also let this module do
		473	the job by specifying a type and type-specific arguments.
		474
		475	Predefined types are (if you have ideas for additional types, feel free to
		476	drop by and tell us):
		477
		478	=over 4
		479
		480	=item netstring => $string
		481
		482	Formats the given value as netstring
		483	(http://cr.yp.to/proto/netstrings.txt, this is not a recommendation to use them).
		484
		485	=cut
		486
		487	register_write_type netstring => sub {
		488	my ($self, $string) = @_;
		489
		490	sprintf "%d:%s,", (length $string), $string
		491	};
		492
		493	=item packstring => $format, $data
		494
		495	An octet string prefixed with an encoded length. The encoding C<$format>
		496	uses the same format as a Perl C<pack> format, but must specify a single
		497	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an
		498	optional C<!>, C<< < >> or C<< > >> modifier).
		499
		500	=cut
		501
		502	register_write_type packstring => sub {
		503	my ($self, $format, $string) = @_;
		504
		505	pack "$format/a", $string
		506	};
		507
		508	=item json => $array_or_hashref
		509
		510	Encodes the given hash or array reference into a JSON object. Unless you
		511	provide your own JSON object, this means it will be encoded to JSON text
		512	in UTF-8.
		513
		514	JSON objects (and arrays) are self-delimiting, so you can write JSON at
		515	one end of a handle and read them at the other end without using any
		516	additional framing.
		517
		518	The generated JSON text is guaranteed not to contain any newlines: While
		519	this module doesn't need delimiters after or between JSON texts to be
		520	able to read them, many other languages depend on that.
		521
		522	A simple RPC protocol that interoperates easily with others is to send
		523	JSON arrays (or objects, although arrays are usually the better choice as
		524	they mimic how function argument passing works) and a newline after each
		525	JSON text:
		526
		527	$handle->push_write (json => ["method", "arg1", "arg2"]); # whatever
		528	$handle->push_write ("\012");
		529
		530	An AnyEvent::Handle receiver would simply use the C<json> read type and
		531	rely on the fact that the newline will be skipped as leading whitespace:
		532
		533	$handle->push_read (json => sub { my $array = $_[1]; ... });
		534
		535	Other languages could read single lines terminated by a newline and pass
		536	this line into their JSON decoder of choice.
		537
		538	=cut
		539
		540	register_write_type json => sub {
		541	my ($self, $ref) = @_;
		542
		543	require JSON;
		544
		545	$self->{json} ? $self->{json}->encode ($ref)
		546	: JSON::encode_json ($ref)
		547	};
		548
		549	=back
		550
		551	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)
		552
		553	This function (not method) lets you add your own types to C<push_write>.
		554	Whenever the given C<type> is used, C<push_write> will invoke the code
		555	reference with the handle object and the remaining arguments.
		556
		557	The code reference is supposed to return a single octet string that will
		558	be appended to the write buffer.
		559
		560	Note that this is a function, and all types registered this way will be
		561	global, so try to use unique names.
		562
		563	=cut
296		564
297	#############################################################################	565	#############################################################################
298		566
299	=back	567	=back
300		568
…		…
312	enough is there) from the read buffer (C<< $handle->rbuf >>) if you want	580	enough is there) from the read buffer (C<< $handle->rbuf >>) if you want
313	or not.	581	or not.
314		582
315	In the more complex case, you want to queue multiple callbacks. In this	583	In the more complex case, you want to queue multiple callbacks. In this
316	case, AnyEvent::Handle will call the first queued callback each time new	584	case, AnyEvent::Handle will call the first queued callback each time new
317	data arrives and removes it when it has done its job (see C<push_read>,	585	data arrives (also the first time it is queued) and removes it when it has
318	below).	586	done its job (see C<push_read>, below).
319		587
320	This way you can, for example, push three line-reads, followed by reading	588	This way you can, for example, push three line-reads, followed by reading
321	a chunk of data, and AnyEvent::Handle will execute them in order.	589	a chunk of data, and AnyEvent::Handle will execute them in order.
322		590
323	Example 1: EPP protocol parser. EPP sends 4 byte length info, followed by	591	Example 1: EPP protocol parser. EPP sends 4 byte length info, followed by
324	the specified number of bytes which give an XML datagram.	592	the specified number of bytes which give an XML datagram.
325		593
326	# in the default state, expect some header bytes	594	# in the default state, expect some header bytes
327	$handle->on_read (sub {	595	$handle->on_read (sub {
328	# some data is here, now queue the length-header-read (4 octets)	596	# some data is here, now queue the length-header-read (4 octets)
329	shift->unshift_read_chunk (4, sub {	597	shift->unshift_read (chunk => 4, sub {
330	# header arrived, decode	598	# header arrived, decode
331	my $len = unpack "N", $_[1];	599	my $len = unpack "N", $_[1];
332		600
333	# now read the payload	601	# now read the payload
334	shift->unshift_read_chunk ($len, sub {	602	shift->unshift_read (chunk => $len, sub {
335	my $xml = $_[1];	603	my $xml = $_[1];
336	# handle xml	604	# handle xml
337	});	605	});
338	});	606	});
339	});	607	});
…		…
346		614
347	# request one	615	# request one
348	$handle->push_write ("request 1\015\012");	616	$handle->push_write ("request 1\015\012");
349		617
350	# we expect "ERROR" or "OK" as response, so push a line read	618	# we expect "ERROR" or "OK" as response, so push a line read
351	$handle->push_read_line (sub {	619	$handle->push_read (line => sub {
352	# if we got an "OK", we have to _prepend_ another line,	620	# if we got an "OK", we have to _prepend_ another line,
353	# so it will be read before the second request reads its 64 bytes	621	# so it will be read before the second request reads its 64 bytes
354	# which are already in the queue when this callback is called	622	# which are already in the queue when this callback is called
355	# we don't do this in case we got an error	623	# we don't do this in case we got an error
356	if ($_[1] eq "OK") {	624	if ($_[1] eq "OK") {
357	$_[0]->unshift_read_line (sub {	625	$_[0]->unshift_read (line => sub {
358	my $response = $_[1];	626	my $response = $_[1];
359	...	627	...
360	});	628	});
361	}	629	}
362	});	630	});
363		631
364	# request two	632	# request two
365	$handle->push_write ("request 2\015\012");	633	$handle->push_write ("request 2\015\012");
366		634
367	# simply read 64 bytes, always	635	# simply read 64 bytes, always
368	$handle->push_read_chunk (64, sub {	636	$handle->push_read (chunk => 64, sub {
369	my $response = $_[1];	637	my $response = $_[1];
370	...	638	...
371	});	639	});
372		640
373	=over 4	641	=over 4
374		642
375	=cut	643	=cut
376		644
377	sub _drain_rbuf {	645	sub _drain_rbuf {
378	my ($self) = @_;	646	my ($self) = @_;
		647
		648	local $self->{_in_drain} = 1;
379		649
380	if (	650	if (
381	defined $self->{rbuf_max}	651	defined $self->{rbuf_max}
382	&& $self->{rbuf_max} < length $self->{rbuf}	652	&& $self->{rbuf_max} < length $self->{rbuf}
383	) {	653	) {
384	$! = &Errno::ENOSPC; return $self->error;	654	return $self->_error (&Errno::ENOSPC, 1);
385	}	655	}
386		656
387	return if $self->{in_drain};	657	while () {
388	local $self->{in_drain} = 1;
389
390	while (my $len = length $self->{rbuf}) {
391	no strict 'refs';	658	no strict 'refs';
		659
		660	my $len = length $self->{rbuf};
		661
392	if (my $cb = shift @{ $self->{queue} }) {	662	if (my $cb = shift @{ $self->{_queue} }) {
393	if (!$cb->($self)) {	663	unless ($cb->($self)) {
394	if ($self->{eof}) {	664	if ($self->{_eof}) {
395	# no progress can be made (not enough data and no data forthcoming)	665	# no progress can be made (not enough data and no data forthcoming)
396	$! = &Errno::EPIPE; return $self->error;	666	$self->_error (&Errno::EPIPE, 1), last;
397	}	667	}
398		668
399	unshift @{ $self->{queue} }, $cb;	669	unshift @{ $self->{_queue} }, $cb;
400	return;	670	last;
401	}	671	}
402	} elsif ($self->{on_read}) {	672	} elsif ($self->{on_read}) {
		673	last unless $len;
		674
403	$self->{on_read}($self);	675	$self->{on_read}($self);
404		676
405	if (	677	if (
406	$self->{eof} # if no further data will arrive
407	&& $len == length $self->{rbuf} # and no data has been consumed	678	$len == length $self->{rbuf} # if no data has been consumed
408	&& !@{ $self->{queue} } # and the queue is still empty	679	&& !@{ $self->{_queue} } # and the queue is still empty
409	&& $self->{on_read} # and we still want to read data	680	&& $self->{on_read} # but we still have on_read
410	) {	681	) {
		682	# no further data will arrive
411	# then no progress can be made	683	# so no progress can be made
412	$! = &Errno::EPIPE; return $self->error;	684	$self->_error (&Errno::EPIPE, 1), last
		685	if $self->{_eof};
		686
		687	last; # more data might arrive
413	}	688	}
414	} else {	689	} else {
415	# read side becomes idle	690	# read side becomes idle
416	delete $self->{rw};	691	delete $self->{_rw};
417	return;	692	last;
418	}	693	}
419	}	694	}
420		695
421	if ($self->{eof}) {
422	$self->_shutdown;
423	$self->{on_eof}($self)	696	$self->{on_eof}($self)
424	if $self->{on_eof};	697	if $self->{_eof} && $self->{on_eof};
		698
		699	# may need to restart read watcher
		700	unless ($self->{_rw}) {
		701	$self->start_read
		702	if $self->{on_read} \|\| @{ $self->{_queue} };
425	}	703	}
426	}	704	}
427		705
428	=item $handle->on_read ($cb)	706	=item $handle->on_read ($cb)
429		707
…		…
435		713
436	sub on_read {	714	sub on_read {
437	my ($self, $cb) = @_;	715	my ($self, $cb) = @_;
438		716
439	$self->{on_read} = $cb;	717	$self->{on_read} = $cb;
		718	$self->_drain_rbuf if $cb && !$self->{_in_drain};
440	}	719	}
441		720
442	=item $handle->rbuf	721	=item $handle->rbuf
443		722
444	Returns the read buffer (as a modifiable lvalue).	723	Returns the read buffer (as a modifiable lvalue).
…		…
463	Append the given callback to the end of the queue (C<push_read>) or	742	Append the given callback to the end of the queue (C<push_read>) or
464	prepend it (C<unshift_read>).	743	prepend it (C<unshift_read>).
465		744
466	The callback is called each time some additional read data arrives.	745	The callback is called each time some additional read data arrives.
467		746
468	It must check wether enough data is in the read buffer already.	747	It must check whether enough data is in the read buffer already.
469		748
470	If not enough data is available, it must return the empty list or a false	749	If not enough data is available, it must return the empty list or a false
471	value, in which case it will be called repeatedly until enough data is	750	value, in which case it will be called repeatedly until enough data is
472	available (or an error condition is detected).	751	available (or an error condition is detected).
473		752
…		…
475	interested in (which can be none at all) and return a true value. After returning	754	interested in (which can be none at all) and return a true value. After returning
476	true, it will be removed from the queue.	755	true, it will be removed from the queue.
477		756
478	=cut	757	=cut
479		758
		759	our %RH;
		760
		761	sub register_read_type($$) {
		762	$RH{$_[0]} = $_[1];
		763	}
		764
480	sub push_read {	765	sub push_read {
481	my ($self, $cb) = @_;	766	my $self = shift;
		767	my $cb = pop;
482		768
		769	if (@_) {
		770	my $type = shift;
		771
		772	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read")
		773	->($self, $cb, @_);
		774	}
		775
483	push @{ $self->{queue} }, $cb;	776	push @{ $self->{_queue} }, $cb;
484	$self->_drain_rbuf;	777	$self->_drain_rbuf unless $self->{_in_drain};
485	}	778	}
486		779
487	sub unshift_read {	780	sub unshift_read {
488	my ($self, $cb) = @_;	781	my $self = shift;
		782	my $cb = pop;
489		783
		784	if (@_) {
		785	my $type = shift;
		786
		787	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read")
		788	->($self, $cb, @_);
		789	}
		790
		791
490	push @{ $self->{queue} }, $cb;	792	unshift @{ $self->{_queue} }, $cb;
491	$self->_drain_rbuf;	793	$self->_drain_rbuf unless $self->{_in_drain};
492	}	794	}
493		795
494	=item $handle->push_read_chunk ($len, $cb->($self, $data))	796	=item $handle->push_read (type => @args, $cb)
495		797
496	=item $handle->unshift_read_chunk ($len, $cb->($self, $data))	798	=item $handle->unshift_read (type => @args, $cb)
497		799
498	Append the given callback to the end of the queue (C<push_read_chunk>) or	800	Instead of providing a callback that parses the data itself you can chose
499	prepend it (C<unshift_read_chunk>).	801	between a number of predefined parsing formats, for chunks of data, lines
		802	etc.
500		803
501	The callback will be called only once C<$len> bytes have been read, and	804	Predefined types are (if you have ideas for additional types, feel free to
502	these C<$len> bytes will be passed to the callback.	805	drop by and tell us):
503		806
504	=cut	807	=over 4
505		808
506	sub _read_chunk($$) {	809	=item chunk => $octets, $cb->($handle, $data)
		810
		811	Invoke the callback only once C<$octets> bytes have been read. Pass the
		812	data read to the callback. The callback will never be called with less
		813	data.
		814
		815	Example: read 2 bytes.
		816
		817	$handle->push_read (chunk => 2, sub {
		818	warn "yay ", unpack "H*", $_[1];
		819	});
		820
		821	=cut
		822
		823	register_read_type chunk => sub {
507	my ($self, $len, $cb) = @_;	824	my ($self, $cb, $len) = @_;
508		825
509	sub {	826	sub {
510	$len <= length $_[0]{rbuf} or return;	827	$len <= length $_[0]{rbuf} or return;
511	$cb->($_[0], substr $_[0]{rbuf}, 0, $len, "");	828	$cb->($_[0], substr $_[0]{rbuf}, 0, $len, "");
512	1	829	1
513	}	830	}
514	}	831	};
515		832
		833	# compatibility with older API
516	sub push_read_chunk {	834	sub push_read_chunk {
517	$_[0]->push_read (&_read_chunk);	835	$_[0]->push_read (chunk => $_[1], $_[2]);
518	}	836	}
519
520		837
521	sub unshift_read_chunk {	838	sub unshift_read_chunk {
522	$_[0]->unshift_read (&_read_chunk);	839	$_[0]->unshift_read (chunk => $_[1], $_[2]);
523	}	840	}
524		841
525	=item $handle->push_read_line ([$eol, ]$cb->($self, $line, $eol))	842	=item line => [$eol, ]$cb->($handle, $line, $eol)
526
527	=item $handle->unshift_read_line ([$eol, ]$cb->($self, $line, $eol))
528
529	Append the given callback to the end of the queue (C<push_read_line>) or
530	prepend it (C<unshift_read_line>).
531		843
532	The callback will be called only once a full line (including the end of	844	The callback will be called only once a full line (including the end of
533	line marker, C<$eol>) has been read. This line (excluding the end of line	845	line marker, C<$eol>) has been read. This line (excluding the end of line
534	marker) will be passed to the callback as second argument (C<$line>), and	846	marker) will be passed to the callback as second argument (C<$line>), and
535	the end of line marker as the third argument (C<$eol>).	847	the end of line marker as the third argument (C<$eol>).
…		…
546	Partial lines at the end of the stream will never be returned, as they are	858	Partial lines at the end of the stream will never be returned, as they are
547	not marked by the end of line marker.	859	not marked by the end of line marker.
548		860
549	=cut	861	=cut
550		862
551	sub _read_line($$) {	863	register_read_type line => sub {
552	my $self = shift;	864	my ($self, $cb, $eol) = @_;
553	my $cb = pop;
554	my $eol = @_ ? shift : qr\|(\015?\012)\|;
555	my $pos;
556		865
		866	$eol = qr\|(\015?\012)\| if @_ < 3;
557	$eol = quotemeta $eol unless ref $eol;	867	$eol = quotemeta $eol unless ref $eol;
558	$eol = qr\|^(.*?)($eol)\|s;	868	$eol = qr\|^(.*?)($eol)\|s;
559		869
560	sub {	870	sub {
561	$_[0]{rbuf} =~ s/$eol// or return;	871	$_[0]{rbuf} =~ s/$eol// or return;
562		872
563	$cb->($_[0], $1, $2);	873	$cb->($_[0], $1, $2);
564	1	874	1
565	}	875	}
566	}	876	};
567		877
		878	# compatibility with older API
568	sub push_read_line {	879	sub push_read_line {
569	$_[0]->push_read (&_read_line);	880	my $self = shift;
		881	$self->push_read (line => @_);
570	}	882	}
571		883
572	sub unshift_read_line {	884	sub unshift_read_line {
573	$_[0]->unshift_read (&_read_line);	885	my $self = shift;
		886	$self->unshift_read (line => @_);
574	}	887	}
		888
		889	=item regex => $accept[, $reject[, $skip], $cb->($handle, $data)
		890
		891	Makes a regex match against the regex object C<$accept> and returns
		892	everything up to and including the match.
		893
		894	Example: read a single line terminated by '\n'.
		895
		896	$handle->push_read (regex => qr<\n>, sub { ... });
		897
		898	If C<$reject> is given and not undef, then it determines when the data is
		899	to be rejected: it is matched against the data when the C<$accept> regex
		900	does not match and generates an C<EBADMSG> error when it matches. This is
		901	useful to quickly reject wrong data (to avoid waiting for a timeout or a
		902	receive buffer overflow).
		903
		904	Example: expect a single decimal number followed by whitespace, reject
		905	anything else (not the use of an anchor).
		906
		907	$handle->push_read (regex => qr<^[0-9]+\s>, qr<[^0-9]>, sub { ... });
		908
		909	If C<$skip> is given and not C<undef>, then it will be matched against
		910	the receive buffer when neither C<$accept> nor C<$reject> match,
		911	and everything preceding and including the match will be accepted
		912	unconditionally. This is useful to skip large amounts of data that you
		913	know cannot be matched, so that the C<$accept> or C<$reject> regex do not
		914	have to start matching from the beginning. This is purely an optimisation
		915	and is usually worth only when you expect more than a few kilobytes.
		916
		917	Example: expect a http header, which ends at C<\015\012\015\012>. Since we
		918	expect the header to be very large (it isn't in practise, but...), we use
		919	a skip regex to skip initial portions. The skip regex is tricky in that
		920	it only accepts something not ending in either \015 or \012, as these are
		921	required for the accept regex.
		922
		923	$handle->push_read (regex =>
		924	qr<\015\012\015\012>,
		925	undef, # no reject
		926	qr<^.*[^\015\012]>,
		927	sub { ... });
		928
		929	=cut
		930
		931	register_read_type regex => sub {
		932	my ($self, $cb, $accept, $reject, $skip) = @_;
		933
		934	my $data;
		935	my $rbuf = \$self->{rbuf};
		936
		937	sub {
		938	# accept
		939	if ($$rbuf =~ $accept) {
		940	$data .= substr $$rbuf, 0, $+[0], "";
		941	$cb->($self, $data);
		942	return 1;
		943	}
		944
		945	# reject
		946	if ($reject && $$rbuf =~ $reject) {
		947	$self->_error (&Errno::EBADMSG);
		948	}
		949
		950	# skip
		951	if ($skip && $$rbuf =~ $skip) {
		952	$data .= substr $$rbuf, 0, $+[0], "";
		953	}
		954
		955	()
		956	}
		957	};
		958
		959	=item netstring => $cb->($handle, $string)
		960
		961	A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement).
		962
		963	Throws an error with C<$!> set to EBADMSG on format violations.
		964
		965	=cut
		966
		967	register_read_type netstring => sub {
		968	my ($self, $cb) = @_;
		969
		970	sub {
		971	unless ($_[0]{rbuf} =~ s/^(0\|[1-9][0-9]*)://) {
		972	if ($_[0]{rbuf} =~ /[^0-9]/) {
		973	$self->_error (&Errno::EBADMSG);
		974	}
		975	return;
		976	}
		977
		978	my $len = $1;
		979
		980	$self->unshift_read (chunk => $len, sub {
		981	my $string = $_[1];
		982	$_[0]->unshift_read (chunk => 1, sub {
		983	if ($_[1] eq ",") {
		984	$cb->($_[0], $string);
		985	} else {
		986	$self->_error (&Errno::EBADMSG);
		987	}
		988	});
		989	});
		990
		991	1
		992	}
		993	};
		994
		995	=item packstring => $format, $cb->($handle, $string)
		996
		997	An octet string prefixed with an encoded length. The encoding C<$format>
		998	uses the same format as a Perl C<pack> format, but must specify a single
		999	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an
		1000	optional C<!>, C<< < >> or C<< > >> modifier).
		1001
		1002	DNS over TCP uses a prefix of C<n>, EPP uses a prefix of C<N>.
		1003
		1004	Example: read a block of data prefixed by its length in BER-encoded
		1005	format (very efficient).
		1006
		1007	$handle->push_read (packstring => "w", sub {
		1008	my ($handle, $data) = @_;
		1009	});
		1010
		1011	=cut
		1012
		1013	register_read_type packstring => sub {
		1014	my ($self, $cb, $format) = @_;
		1015
		1016	sub {
		1017	# when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method
		1018	defined (my $len = eval { unpack $format, $_[0]->{rbuf} })
		1019	or return;
		1020
		1021	# remove prefix
		1022	substr $_[0]->{rbuf}, 0, (length pack $format, $len), "";
		1023
		1024	# read rest
		1025	$_[0]->unshift_read (chunk => $len, $cb);
		1026
		1027	1
		1028	}
		1029	};
		1030
		1031	=item json => $cb->($handle, $hash_or_arrayref)
		1032
		1033	Reads a JSON object or array, decodes it and passes it to the callback.
		1034
		1035	If a C<json> object was passed to the constructor, then that will be used
		1036	for the final decode, otherwise it will create a JSON coder expecting UTF-8.
		1037
		1038	This read type uses the incremental parser available with JSON version
		1039	2.09 (and JSON::XS version 2.2) and above. You have to provide a
		1040	dependency on your own: this module will load the JSON module, but
		1041	AnyEvent does not depend on it itself.
		1042
		1043	Since JSON texts are fully self-delimiting, the C<json> read and write
		1044	types are an ideal simple RPC protocol: just exchange JSON datagrams. See
		1045	the C<json> write type description, above, for an actual example.
		1046
		1047	=cut
		1048
		1049	register_read_type json => sub {
		1050	my ($self, $cb, $accept, $reject, $skip) = @_;
		1051
		1052	require JSON;
		1053
		1054	my $data;
		1055	my $rbuf = \$self->{rbuf};
		1056
		1057	my $json = $self->{json} \|\|= JSON->new->utf8;
		1058
		1059	sub {
		1060	my $ref = $json->incr_parse ($self->{rbuf});
		1061
		1062	if ($ref) {
		1063	$self->{rbuf} = $json->incr_text;
		1064	$json->incr_text = "";
		1065	$cb->($self, $ref);
		1066
		1067	1
		1068	} else {
		1069	$self->{rbuf} = "";
		1070	()
		1071	}
		1072	}
		1073	};
		1074
		1075	=back
		1076
		1077	=item AnyEvent::Handle::register_read_type type => $coderef->($handle, $cb, @args)
		1078
		1079	This function (not method) lets you add your own types to C<push_read>.
		1080
		1081	Whenever the given C<type> is used, C<push_read> will invoke the code
		1082	reference with the handle object, the callback and the remaining
		1083	arguments.
		1084
		1085	The code reference is supposed to return a callback (usually a closure)
		1086	that works as a plain read callback (see C<< ->push_read ($cb) >>).
		1087
		1088	It should invoke the passed callback when it is done reading (remember to
		1089	pass C<$handle> as first argument as all other callbacks do that).
		1090
		1091	Note that this is a function, and all types registered this way will be
		1092	global, so try to use unique names.
		1093
		1094	For examples, see the source of this module (F<perldoc -m AnyEvent::Handle>,
		1095	search for C<register_read_type>)).
575		1096
576	=item $handle->stop_read	1097	=item $handle->stop_read
577		1098
578	=item $handle->start_read	1099	=item $handle->start_read
579		1100
580	In rare cases you actually do not want to read anything from the	1101	In rare cases you actually do not want to read anything from the
581	socket. In this case you can call C<stop_read>. Neither C<on_read> no	1102	socket. In this case you can call C<stop_read>. Neither C<on_read> nor
582	any queued callbacks will be executed then. To start readign again, call	1103	any queued callbacks will be executed then. To start reading again, call
583	C<start_read>.	1104	C<start_read>.
		1105
		1106	Note that AnyEvent::Handle will automatically C<start_read> for you when
		1107	you change the C<on_read> callback or push/unshift a read callback, and it
		1108	will automatically C<stop_read> for you when neither C<on_read> is set nor
		1109	there are any read requests in the queue.
584		1110
585	=cut	1111	=cut
586		1112
587	sub stop_read {	1113	sub stop_read {
588	my ($self) = @_;	1114	my ($self) = @_;
589		1115
590	delete $self->{rw};	1116	delete $self->{_rw};
591	}	1117	}
592		1118
593	sub start_read {	1119	sub start_read {
594	my ($self) = @_;	1120	my ($self) = @_;
595		1121
596	unless ($self->{rw} \|\| $self->{eof}) {	1122	unless ($self->{_rw} \|\| $self->{_eof}) {
597	Scalar::Util::weaken $self;	1123	Scalar::Util::weaken $self;
598		1124
599	$self->{rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {	1125	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {
600	my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf};	1126	my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf};
601	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} \|\| 8192, length $$rbuf;	1127	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} \|\| 8192, length $$rbuf;
602		1128
603	if ($len > 0) {	1129	if ($len > 0) {
		1130	$self->{_activity} = AnyEvent->now;
		1131
604	$self->{filter_r}	1132	$self->{filter_r}
605	? $self->{filter_r}->($self, $rbuf)	1133	? $self->{filter_r}($self, $rbuf)
606	: $self->_drain_rbuf;	1134	: $self->{_in_drain} \|\| $self->_drain_rbuf;
607		1135
608	} elsif (defined $len) {	1136	} elsif (defined $len) {
609	delete $self->{rw};	1137	delete $self->{_rw};
610	$self->{eof} = 1;	1138	$self->{_eof} = 1;
611	$self->_drain_rbuf;	1139	$self->_drain_rbuf unless $self->{_in_drain};
612		1140
613	} elsif ($! != EAGAIN && $! != EINTR) {	1141	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
614	return $self->error;	1142	return $self->_error ($!, 1);
615	}	1143	}
616	});	1144	});
617	}	1145	}
618	}	1146	}
619		1147
		1148	sub _dotls {
		1149	my ($self) = @_;
		1150
		1151	my $buf;
		1152
		1153	if (length $self->{_tls_wbuf}) {
		1154	while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {
		1155	substr $self->{_tls_wbuf}, 0, $len, "";
		1156	}
		1157	}
		1158
		1159	if (length ($buf = Net::SSLeay::BIO_read ($self->{_wbio}))) {
		1160	$self->{wbuf} .= $buf;
		1161	$self->_drain_wbuf;
		1162	}
		1163
		1164	while (defined ($buf = Net::SSLeay::read ($self->{tls}))) {
		1165	if (length $buf) {
		1166	$self->{rbuf} .= $buf;
		1167	$self->_drain_rbuf unless $self->{_in_drain};
		1168	} else {
		1169	# let's treat SSL-eof as we treat normal EOF
		1170	$self->{_eof} = 1;
		1171	$self->_shutdown;
		1172	return;
		1173	}
		1174	}
		1175
		1176	my $err = Net::SSLeay::get_error ($self->{tls}, -1);
		1177
		1178	if ($err!= Net::SSLeay::ERROR_WANT_READ ()) {
		1179	if ($err == Net::SSLeay::ERROR_SYSCALL ()) {
		1180	return $self->_error ($!, 1);
		1181	} elsif ($err == Net::SSLeay::ERROR_SSL ()) {
		1182	return $self->_error (&Errno::EIO, 1);
		1183	}
		1184
		1185	# all others are fine for our purposes
		1186	}
		1187	}
		1188
		1189	=item $handle->starttls ($tls[, $tls_ctx])
		1190
		1191	Instead of starting TLS negotiation immediately when the AnyEvent::Handle
		1192	object is created, you can also do that at a later time by calling
		1193	C<starttls>.
		1194
		1195	The first argument is the same as the C<tls> constructor argument (either
		1196	C<"connect">, C<"accept"> or an existing Net::SSLeay object).
		1197
		1198	The second argument is the optional C<Net::SSLeay::CTX> object that is
		1199	used when AnyEvent::Handle has to create its own TLS connection object.
		1200
		1201	The TLS connection object will end up in C<< $handle->{tls} >> after this
		1202	call and can be used or changed to your liking. Note that the handshake
		1203	might have already started when this function returns.
		1204
		1205	=cut
		1206
		1207	sub starttls {
		1208	my ($self, $ssl, $ctx) = @_;
		1209
		1210	$self->stoptls;
		1211
		1212	if ($ssl eq "accept") {
		1213	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());
		1214	Net::SSLeay::set_accept_state ($ssl);
		1215	} elsif ($ssl eq "connect") {
		1216	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());
		1217	Net::SSLeay::set_connect_state ($ssl);
		1218	}
		1219
		1220	$self->{tls} = $ssl;
		1221
		1222	# basically, this is deep magic (because SSL_read should have the same issues)
		1223	# but the openssl maintainers basically said: "trust us, it just works".
		1224	# (unfortunately, we have to hardcode constants because the abysmally misdesigned
		1225	# and mismaintained ssleay-module doesn't even offer them).
		1226	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html
		1227	Net::SSLeay::CTX_set_mode ($self->{tls},
		1228	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } \|\| 1)
		1229	\| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } \|\| 2));
		1230
		1231	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
		1232	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
		1233
		1234	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});
		1235
		1236	$self->{filter_w} = sub {
		1237	$_[0]{_tls_wbuf} .= ${$_[1]};
		1238	&_dotls;
		1239	};
		1240	$self->{filter_r} = sub {
		1241	Net::SSLeay::BIO_write ($_[0]{_rbio}, ${$_[1]});
		1242	&_dotls;
		1243	};
		1244	}
		1245
		1246	=item $handle->stoptls
		1247
		1248	Destroys the SSL connection, if any. Partial read or write data will be
		1249	lost.
		1250
		1251	=cut
		1252
		1253	sub stoptls {
		1254	my ($self) = @_;
		1255
		1256	Net::SSLeay::free (delete $self->{tls}) if $self->{tls};
		1257
		1258	delete $self->{_rbio};
		1259	delete $self->{_wbio};
		1260	delete $self->{_tls_wbuf};
		1261	delete $self->{filter_r};
		1262	delete $self->{filter_w};
		1263	}
		1264
		1265	sub DESTROY {
		1266	my $self = shift;
		1267
		1268	$self->stoptls;
		1269
		1270	my $linger = exists $self->{linger} ? $self->{linger} : 3600;
		1271
		1272	if ($linger && length $self->{wbuf}) {
		1273	my $fh = delete $self->{fh};
		1274	my $wbuf = delete $self->{wbuf};
		1275
		1276	my @linger;
		1277
		1278	push @linger, AnyEvent->io (fh => $fh, poll => "w", cb => sub {
		1279	my $len = syswrite $fh, $wbuf, length $wbuf;
		1280
		1281	if ($len > 0) {
		1282	substr $wbuf, 0, $len, "";
		1283	} else {
		1284	@linger = (); # end
		1285	}
		1286	});
		1287	push @linger, AnyEvent->timer (after => $linger, cb => sub {
		1288	@linger = ();
		1289	});
		1290	}
		1291	}
		1292
		1293	=item AnyEvent::Handle::TLS_CTX
		1294
		1295	This function creates and returns the Net::SSLeay::CTX object used by
		1296	default for TLS mode.
		1297
		1298	The context is created like this:
		1299
		1300	Net::SSLeay::load_error_strings;
		1301	Net::SSLeay::SSLeay_add_ssl_algorithms;
		1302	Net::SSLeay::randomize;
		1303
		1304	my $CTX = Net::SSLeay::CTX_new;
		1305
		1306	Net::SSLeay::CTX_set_options $CTX, Net::SSLeay::OP_ALL
		1307
		1308	=cut
		1309
		1310	our $TLS_CTX;
		1311
		1312	sub TLS_CTX() {
		1313	$TLS_CTX \|\| do {
		1314	require Net::SSLeay;
		1315
		1316	Net::SSLeay::load_error_strings ();
		1317	Net::SSLeay::SSLeay_add_ssl_algorithms ();
		1318	Net::SSLeay::randomize ();
		1319
		1320	$TLS_CTX = Net::SSLeay::CTX_new ();
		1321
		1322	Net::SSLeay::CTX_set_options ($TLS_CTX, Net::SSLeay::OP_ALL ());
		1323
		1324	$TLS_CTX
		1325	}
		1326	}
		1327
620	=back	1328	=back
621		1329
		1330	=head1 SUBCLASSING AnyEvent::Handle
		1331
		1332	In many cases, you might want to subclass AnyEvent::Handle.
		1333
		1334	To make this easier, a given version of AnyEvent::Handle uses these
		1335	conventions:
		1336
		1337	=over 4
		1338
		1339	=item * all constructor arguments become object members.
		1340
		1341	At least initially, when you pass a C<tls>-argument to the constructor it
		1342	will end up in C<< $handle->{tls} >>. Those members might be changes or
		1343	mutated later on (for example C<tls> will hold the TLS connection object).
		1344
		1345	=item * other object member names are prefixed with an C<_>.
		1346
		1347	All object members not explicitly documented (internal use) are prefixed
		1348	with an underscore character, so the remaining non-C<_>-namespace is free
		1349	for use for subclasses.
		1350
		1351	=item * all members not documented here and not prefixed with an underscore
		1352	are free to use in subclasses.
		1353
		1354	Of course, new versions of AnyEvent::Handle may introduce more "public"
		1355	member variables, but thats just life, at least it is documented.
		1356
		1357	=back
		1358
622	=head1 AUTHOR	1359	=head1 AUTHOR
623		1360
624	Robin Redeker C<< <elmex at ta-sa.org> >>, Marc Lehmann <schmorp@schmorp.de>.	1361	Robin Redeker C<< <elmex at ta-sa.org> >>, Marc Lehmann <schmorp@schmorp.de>.
625		1362
626	=cut	1363	=cut

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Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents): Revision 1.18 by root, Sat May 24 05:01:16 2008 UTC vs. Revision 1.62 by root, Fri Jun 6 10:49:20 2008 UTC

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Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.18 by root, Sat May 24 05:01:16 2008 UTC vs.
Revision 1.62 by root, Fri Jun 6 10:49:20 2008 UTC