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

Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.1 by elmex, Sun Apr 27 16:56:17 2008 UTC vs.
Revision 1.9 by root, Fri May 2 16:07:46 2008 UTC

1	package AnyEvent::Handle;	1	package AnyEvent::Handle;
2		2
3	use warnings;	3	no warnings;
4	use strict;	4	use strict;
5		5
6	use AnyEvent;	6	use AnyEvent ();
7	use IO::Handle;	7	use AnyEvent::Util ();
		8	use Scalar::Util ();
		9	use Carp ();
		10	use Fcntl ();
8	use Errno qw/EAGAIN EINTR/;	11	use Errno qw/EAGAIN EINTR/;
9		12
10	=head1 NAME	13	=head1 NAME
11		14
12	AnyEvent::Handle - non-blocking I/O on filehandles via AnyEvent	15	AnyEvent::Handle - non-blocking I/O on filehandles via AnyEvent
13		16
14	=head1 VERSION
15
16	Version 0.01
17
18	=cut	17	=cut
19		18
20	our $VERSION = '0.01';	19	our $VERSION = '0.02';
21		20
22	=head1 SYNOPSIS	21	=head1 SYNOPSIS
23		22
24	use AnyEvent;	23	use AnyEvent;
25	use AnyEvent::Handle;	24	use AnyEvent::Handle;
26		25
27	my $cv = AnyEvent->condvar;	26	my $cv = AnyEvent->condvar;
28		27
29	my $ae_fh = AnyEvent::Handle->new (fh => \*STDIN);	28	my $ae_fh = AnyEvent::Handle->new (fh => \*STDIN);
30		29
		30	#TODO
		31
		32	# or use the constructor to pass the callback:
		33
		34	my $ae_fh2 =
		35	AnyEvent::Handle->new (
		36	fh => \*STDIN,
		37	on_eof => sub {
		38	$cv->broadcast;
		39	},
		40	#TODO
		41	);
		42
		43	$cv->wait;
		44
		45	=head1 DESCRIPTION
		46
		47	This module is a helper module to make it easier to do event-based I/O on
		48	filehandles (and sockets, see L<AnyEvent::Socket> for an easy way to make
		49	non-blocking resolves and connects).
		50
		51	In the following, when the documentation refers to of "bytes" then this
		52	means characters. As sysread and syswrite are used for all I/O, their
		53	treatment of characters applies to this module as well.
		54
		55	All callbacks will be invoked with the handle object as their first
		56	argument.
		57
		58	=head1 METHODS
		59
		60	=over 4
		61
		62	=item B<new (%args)>
		63
		64	The constructor supports these arguments (all as key => value pairs).
		65
		66	=over 4
		67
		68	=item fh => $filehandle [MANDATORY]
		69
		70	The filehandle this L<AnyEvent::Handle> object will operate on.
		71
		72	NOTE: The filehandle will be set to non-blocking (using
		73	AnyEvent::Util::fh_nonblocking).
		74
		75	=item on_error => $cb->($self) [MANDATORY]
		76
		77	This is the fatal error callback, that is called when a fatal error ocurs,
		78	such as not being able to resolve the hostname, failure to connect or a
		79	read error.
		80
		81	The object will not be in a usable state when this callback has been
		82	called.
		83
		84	On callback entrance, the value of C<$!> contains the opertaing system
		85	error (or C<ENOSPC> or C<EPIPE>).
		86
		87	=item on_eof => $cb->($self) [MANDATORY]
		88
		89	Set the callback to be called on EOF.
		90
		91	=item on_read => $cb->($self)
		92
		93	This sets the default read callback, which is called when data arrives
		94	and no read request is in the queue. If the read callback is C<undef>
		95	or has never been set, than AnyEvent::Handle will cease reading from the
		96	filehandle.
		97
		98	To access (and remove data from) the read buffer, use the C<< ->rbuf >>
		99	method or acces sthe C<$self->{rbuf}> member directly.
		100
		101	When an EOF condition is detected then AnyEvent::Handle will first try to
		102	feed all the remaining data to the queued callbacks and C<on_read> before
		103	calling the C<on_eof> callback. If no progress can be made, then a fatal
		104	error will be raised (with C<$!> set to C<EPIPE>).
		105
		106	=item on_drain => $cb->()
		107
		108	This sets the callback that is called when the write buffer becomes empty
		109	(or when the callback is set and the buffer is empty already).
		110
		111	To append to the write buffer, use the C<< ->push_write >> method.
		112
		113	=item rbuf_max => <bytes>
		114
		115	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)
		116	when the read buffer ever (strictly) exceeds this size. This is useful to
		117	avoid denial-of-service attacks.
		118
		119	For example, a server accepting connections from untrusted sources should
		120	be configured to accept only so-and-so much data that it cannot act on
		121	(for example, when expecting a line, an attacker could send an unlimited
		122	amount of data without a callback ever being called as long as the line
		123	isn't finished).
		124
		125	=item read_size => <bytes>
		126
		127	The default read block size (the amount of bytes this module will try to read
		128	on each [loop iteration). Default: C<4096>.
		129
		130	=item low_water_mark => <bytes>
		131
		132	Sets the amount of bytes (default: C<0>) that make up an "empty" write
		133	buffer: If the write reaches this size or gets even samller it is
		134	considered empty.
		135
		136	=back
		137
		138	=cut
		139
		140	sub new {
		141	my $class = shift;
		142
		143	my $self = bless { @_ }, $class;
		144
		145	$self->{fh} or Carp::croak "mandatory argument fh is missing";
		146
		147	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;
		148
		149	$self->on_error ((delete $self->{on_error}) or Carp::croak "mandatory argument on_error is missing");
		150	$self->on_eof ((delete $self->{on_eof} ) or Carp::croak "mandatory argument on_eof is missing");
		151
		152	$self->on_drain (delete $self->{on_drain}) if $self->{on_drain};
		153	$self->on_read (delete $self->{on_read} ) if $self->{on_read};
		154
		155	$self
		156	}
		157
		158	sub _shutdown {
		159	my ($self) = @_;
		160
		161	delete $self->{rw};
		162	delete $self->{ww};
		163	delete $self->{fh};
		164	}
		165
		166	sub error {
		167	my ($self) = @_;
		168
		169	{
		170	local $!;
		171	$self->_shutdown;
		172	}
		173
		174	$self->{on_error}($self);
		175	}
		176
		177	=item $fh = $handle->fh
		178
		179	This method returns the filehandle of the L<AnyEvent::Handle> object.
		180
		181	=cut
		182
		183	sub fh { $_[0]->{fh} }
		184
		185	=item $handle->on_error ($cb)
		186
		187	Replace the current C<on_error> callback (see the C<on_error> constructor argument).
		188
		189	=cut
		190
		191	sub on_error {
		192	$_[0]{on_error} = $_[1];
		193	}
		194
		195	=item $handle->on_eof ($cb)
		196
		197	Replace the current C<on_eof> callback (see the C<on_eof> constructor argument).
		198
		199	=cut
		200
		201	sub on_eof {
		202	$_[0]{on_eof} = $_[1];
		203	}
		204
		205	#############################################################################
		206
		207	=back
		208
		209	=head2 WRITE QUEUE
		210
		211	AnyEvent::Handle manages two queues per handle, one for writing and one
		212	for reading.
		213
		214	The write queue is very simple: you can add data to its end, and
		215	AnyEvent::Handle will automatically try to get rid of it for you.
		216
		217	When data could be writtena nd the write buffer is shorter then the low
		218	water mark, the C<on_drain> callback will be invoked.
		219
		220	=over 4
		221
		222	=item $handle->on_drain ($cb)
		223
		224	Sets the C<on_drain> callback or clears it (see the description of
		225	C<on_drain> in the constructor).
		226
		227	=cut
		228
		229	sub on_drain {
		230	my ($self, $cb) = @_;
		231
		232	$self->{on_drain} = $cb;
		233
		234	$cb->($self)
		235	if $cb && $self->{low_water_mark} >= length $self->{wbuf};
		236	}
		237
		238	=item $handle->push_write ($data)
		239
		240	Queues the given scalar to be written. You can push as much data as you
		241	want (only limited by the available memory), as C<AnyEvent::Handle>
		242	buffers it independently of the kernel.
		243
		244	=cut
		245
		246	sub push_write {
		247	my ($self, $data) = @_;
		248
		249	$self->{wbuf} .= $data;
		250
		251	unless ($self->{ww}) {
		252	Scalar::Util::weaken $self;
		253	my $cb = sub {
		254	my $len = syswrite $self->{fh}, $self->{wbuf};
		255
		256	if ($len > 0) {
		257	substr $self->{wbuf}, 0, $len, "";
		258
		259
		260	$self->{on_drain}($self)
		261	if $self->{low_water_mark} >= length $self->{wbuf}
		262	&& $self->{on_drain};
		263
		264	delete $self->{ww} unless length $self->{wbuf};
		265	} elsif ($! != EAGAIN && $! != EINTR) {
		266	$self->error;
		267	}
		268	};
		269
		270	$self->{ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb);
		271
		272	$cb->($self);
		273	};
		274	}
		275
		276	#############################################################################
		277
		278	=back
		279
		280	=head2 READ QUEUE
		281
		282	AnyEvent::Handle manages two queues per handle, one for writing and one
		283	for reading.
		284
		285	The read queue is more complex than the write queue. It can be used in two
		286	ways, the "simple" way, using only C<on_read> and the "complex" way, using
		287	a queue.
		288
		289	In the simple case, you just install an C<on_read> callback and whenever
		290	new data arrives, it will be called. You can then remove some data (if
		291	enough is there) from the read buffer (C<< $handle->rbuf >>) if you want
		292	or not.
		293
		294	In the more complex case, you want to queue multiple callbacks. In this
		295	case, AnyEvent::Handle will call the first queued callback each time new
		296	data arrives and removes it when it has done its job (see C<push_read>,
		297	below).
		298
		299	This way you can, for example, push three line-reads, followed by reading
		300	a chunk of data, and AnyEvent::Handle will execute them in order.
		301
		302	Example 1: EPP protocol parser. EPP sends 4 byte length info, followed by
		303	the specified number of bytes which give an XML datagram.
		304
		305	# in the default state, expect some header bytes
		306	$handle->on_read (sub {
		307	# some data is here, now queue the length-header-read (4 octets)
		308	shift->unshift_read_chunk (4, sub {
		309	# header arrived, decode
		310	my $len = unpack "N", $_[1];
		311
		312	# now read the payload
		313	shift->unshift_read_chunk ($len, sub {
		314	my $xml = $_[1];
		315	# handle xml
		316	});
		317	});
		318	});
		319
		320	Example 2: Implement a client for a protocol that replies either with
		321	"OK" and another line or "ERROR" for one request, and 64 bytes for the
		322	second request. Due tot he availability of a full queue, we can just
		323	pipeline sending both requests and manipulate the queue as necessary in
		324	the callbacks:
		325
		326	# request one
		327	$handle->push_write ("request 1\015\012");
		328
		329	# we expect "ERROR" or "OK" as response, so push a line read
31	$ae_fh->readlines (sub {	330	$handle->push_read_line (sub {
32	my ($ae_fh, @lines) = @_;	331	# if we got an "OK", we have to _prepend_ another line,
33	for (@lines) {	332	# so it will be read before the second request reads its 64 bytes
34	chomp;	333	# which are already in the queue when this callback is called
35	print "Line: $_";	334	# we don't do this in case we got an error
		335	if ($_[1] eq "OK") {
		336	$_[0]->unshift_read_line (sub {
		337	my $response = $_[1];
		338	...
		339	});
36	}	340	}
37	$cv->broadcast;
38	});	341	});
39		342
40	$cv->wait;	343	# request two
		344	$handle->push_write ("request 2\015\012");
41		345
42	=head1 DESCRIPTION	346	# simply read 64 bytes, always
43		347	$handle->push_read_chunk (64, sub {
44	This module is a helper module to make it easier to do non-blocking I/O	348	my $response = $_[1];
45	on filehandles (and sockets, see L<AnyEvent::Socket>).	349	...
46		350	});
47	The event loop is provided by L<AnyEvent>.
48
49	=head1 METHODS
50		351
51	=over 4	352	=over 4
52		353
53	=item B<new (%args)>	354	sub _drain_rbuf {
54
55	The constructor has these arguments:
56
57	=over 4
58
59	=item fh => $filehandle
60
61	The filehandle this L<AnyEvent::Handle> object will operate on.
62
63	NOTE: The filehandle will be set to non-blocking.
64
65	=item read_block_size => $size
66
67	The default read block size use for reads via the C<on_read>
68	method.
69
70	=back
71
72	=cut
73
74	sub new {
75	my $this = shift;
76	my $class = ref($this) \|\| $this;
77	my $self = {	355	my ($self) = @_;
78	read_block_size => 4096,
79	rbuf => '',
80	@_
81	};
82	bless $self, $class;
83		356
84	$self->{fh}->blocking (0) if $self->{fh};	357	return if exists $self->{in_drain};
		358	local $self->{in_drain} = 1;
85		359
86	if ($self->{on_read}) {	360	while (my $len = length $self->{rbuf}) {
87	$self->on_read ($self->{on_read});	361	no strict 'refs';
88		362	if (@{ $self->{queue} }) {
		363	if ($self->{queue}[0]($self)) {
		364	shift @{ $self->{queue} };
		365	} elsif ($self->{eof}) {
		366	# no progress can be made (not enough data and no data forthcoming)
		367	$! = &Errno::EPIPE; return $self->error;
		368	} else {
		369	return;
		370	}
89	} elsif ($self->{on_readline}) {	371	} elsif ($self->{on_read}) {
90	$self->readlines ($self->{on_readline});	372	$self->{on_read}($self);
		373
		374	if (
		375	$self->{eof} # if no further data will arrive
		376	&& $len == length $self->{rbuf} # and no data has been consumed
		377	&& !@{ $self->{queue} } # and the queue is still empty
		378	&& $self->{on_read} # and we still want to read data
		379	) {
		380	# then no progress can be made
		381	$! = &Errno::EPIPE; return $self->error;
		382	}
		383	} else {
		384	# read side becomes idle
		385	delete $self->{rw};
		386	return;
		387	}
91	}	388	}
92		389
93	return $self	390	if ($self->{eof}) {
		391	$self->_shutdown;
		392	$self->{on_eof}($self);
		393	}
94	}	394	}
95		395
96	=item B<fh>	396	=item $handle->on_read ($cb)
97		397
98	This method returns the filehandle of the L<AnyEvent::Handle> object.	398	This replaces the currently set C<on_read> callback, or clears it (when
99		399	the new callback is C<undef>). See the description of C<on_read> in the
100	=cut	400	constructor.
101
102	sub fh { $_[0]->{fh} }
103
104	=item B<on_read ($callback)>
105
106	This method installs a C<$callback> that will be called
107	when new data arrived. You can access the read buffer via the C<rbuf>
108	method (see below).
109
110	The first argument of the C<$callback> will be the L<AnyEvent::Handle> object.
111		401
112	=cut	402	=cut
113		403
114	sub on_read {	404	sub on_read {
115	my ($self, $cb) = @_;	405	my ($self, $cb) = @_;
		406
116	$self->{on_read} = $cb;	407	$self->{on_read} = $cb;
117		408
118	unless (defined $self->{on_read}) {	409	unless ($self->{rw} \|\| $self->{eof}) {
		410	Scalar::Util::weaken $self;
		411
		412	$self->{rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {
		413	my $len = sysread $self->{fh}, $self->{rbuf}, $self->{read_size} \|\| 8192, length $self->{rbuf};
		414
		415	if ($len > 0) {
		416	if (exists $self->{rbuf_max}) {
		417	if ($self->{rbuf_max} < length $self->{rbuf}) {
		418	$! = &Errno::ENOSPC; return $self->error;
		419	}
		420	}
		421
		422	} elsif (defined $len) {
		423	$self->{eof} = 1;
119	delete $self->{on_read_w};	424	delete $self->{rw};
120	return;	425
		426	} elsif ($! != EAGAIN && $! != EINTR) {
		427	return $self->error;
		428	}
		429
		430	$self->_drain_rbuf;
		431	});
121	}	432	}
122
123	$self->{on_read_w} =
124	AnyEvent->io (poll => 'r', fh => $self->{fh}, cb => sub {
125	#d# warn "READ:[$self->{read_size}] $self->{read_block_size} : ".length ($self->{rbuf})."\n";
126	my $rbuf_len = length $self->{rbuf};
127	my $l;
128	if (defined $self->{read_size}) {
129	$l = sysread $self->{fh}, $self->{rbuf},
130	($self->{read_size} - $rbuf_len), $rbuf_len;
131	} else {
132	$l = sysread $self->{fh}, $self->{rbuf}, $self->{read_block_size}, $rbuf_len;
133	}
134	#d# warn "READL $l [$self->{rbuf}]\n";
135
136	if (not defined $l) {
137	return if $! == EAGAIN \|\| $! == EINTR;
138	$self->{on_error}->($self, $!) if $self->{on_error};
139	delete $self->{on_read_w};
140
141	} elsif ($l == 0) {
142	$self->{on_eof}->($self) if $self->{on_eof};
143	delete $self->{on_read_w};
144
145	} else {
146	$self->{on_read}->($self);
147	}
148	});
149	}	433	}
150		434
151	=item B<on_error ($callback)>	435	=item $handle->rbuf
152		436
153	Whenever a read or write operation resulted in an error the C<$callback>	437	Returns the read buffer (as a modifiable lvalue).
154	will be called.
155		438
156	The first argument of C<$callback> will be the L<AnyEvent::Handle> object itself	439	You can access the read buffer directly as the C<< ->{rbuf} >> member, if
157	and the second argument will be the value of C<$!>.	440	you want.
158		441
159	=cut
160
161	sub on_error {
162	$_[0]->{on_error} = $_[1];
163	}
164
165	=item B<on_eof ($callback)>
166
167	Installs the C<$callback> that will be called when the end of file is
168	encountered in a read operation this C<$callback> will be called. The first
169	argument will be the L<AnyEvent::Handle> object itself.
170
171	=cut
172
173	sub on_eof {
174	$_[0]->{on_eof} = $_[1];
175	}
176
177	=item B<rbuf>
178
179	Returns a reference to the read buffer.
180
181	NOTE: The read buffer should only be used or modified if the C<on_read>	442	NOTE: The read buffer should only be used or modified if the C<on_read>,
182	method is used directly. The C<read> and C<readlines> methods will provide	443	C<push_read> or C<unshift_read> methods are used. The other read methods
183	the read data to their callbacks.	444	automatically manage the read buffer.
184		445
185	=cut	446	=cut
186		447
187	sub rbuf : lvalue { $_[0]->{rbuf} }	448	sub rbuf : lvalue {
		449	$_[0]{rbuf}
		450	}
188		451
189	=item B<read ($len, $callback)>	452	=item $handle->push_read ($cb)
190		453
191	Will read exactly C<$len> bytes from the filehandle and call the C<$callback>	454	=item $handle->unshift_read ($cb)
192	if done so. The first argument to the C<$callback> will be the L<AnyEvent::Handle>
193	object itself and the second argument the read data.
194		455
195	NOTE: This method will override any callbacks installed via the C<on_read> method.	456	Append the given callback to the end of the queue (C<push_read>) or
		457	prepend it (C<unshift_read>).
196		458
197	=cut	459	The callback is called each time some additional read data arrives.
198		460
		461	It must check wether enough data is in the read buffer already.
		462
		463	If not enough data is available, it must return the empty list or a false
		464	value, in which case it will be called repeatedly until enough data is
		465	available (or an error condition is detected).
		466
		467	If enough data was available, then the callback must remove all data it is
		468	interested in (which can be none at all) and return a true value. After returning
		469	true, it will be removed from the queue.
		470
		471	=cut
		472
199	sub read {	473	sub push_read {
		474	my ($self, $cb) = @_;
		475
		476	push @{ $self->{queue} }, $cb;
		477	$self->_drain_rbuf;
		478	}
		479
		480	sub unshift_read {
		481	my ($self, $cb) = @_;
		482
		483	push @{ $self->{queue} }, $cb;
		484	$self->_drain_rbuf;
		485	}
		486
		487	=item $handle->push_read_chunk ($len, $cb->($self, $data))
		488
		489	=item $handle->unshift_read_chunk ($len, $cb->($self, $data))
		490
		491	Append the given callback to the end of the queue (C<push_read_chunk>) or
		492	prepend it (C<unshift_read_chunk>).
		493
		494	The callback will be called only once C<$len> bytes have been read, and
		495	these C<$len> bytes will be passed to the callback.
		496
		497	=cut
		498
		499	sub _read_chunk($$) {
		500	my ($len, $cb) = @_;
		501
		502	sub {
		503	$len <= length $_[0]{rbuf} or return;
		504	$cb->($_[0], substr $_[0]{rbuf}, 0, $len, "");
		505	1
		506	}
		507	}
		508
		509	sub push_read_chunk {
200	my ($self, $len, $cb) = @_;	510	my ($self, $len, $cb) = @_;
201		511
202	$self->{read_cb} = $cb;	512	$self->push_read (_read_chunk $len, $cb);
203	my $old_blk_size = $self->{read_block_size};
204	$self->{read_block_size} = $len;
205
206	$self->on_read (sub {
207	#d# warn "OFOFO $len \|\| ".length($_[0]->{rbuf})."\|\|\n";
208
209	if ($len == length $_[0]->{rbuf}) {
210	$_[0]->{read_block_size} = $old_blk_size;
211	$_[0]->on_read (undef);
212	$_[0]->{read_cb}->($_[0], (substr $self->{rbuf}, 0, $len, ''));
213	}
214	});
215	}	513	}
216		514
217	=item B<readlines ($callback)>
218		515
219	=item B<readlines ($sep, $callback)>	516	sub unshift_read_chunk {
220
221	This method will read lines from the filehandle, seperated by C<$sep> or C<"\n">
222	if C<$sep> is not provided. C<$sep> will be used as part of a regex, so it can be
223	a regex itself and won't be quoted!
224
225	The C<$callback> will be called when at least one
226	line could be read. The first argument to the C<$callback> will be the L<AnyEvent::Handle>
227	object itself and the rest of the arguments will be the read lines.
228
229	NOTE: This method will override any callbacks installed via the C<on_read> method.
230
231	=cut
232
233	sub readlines {
234	my ($self, $NL, $cb) = @_;	517	my ($self, $len, $cb) = @_;
235		518
236	if (ref $NL) {	519	$self->unshift_read (_read_chunk $len, $cb);
237	$cb = $NL;	520	}
238	$NL = "\n";	521
		522	=item $handle->push_read_line ([$eol, ]$cb->($self, $line, $eol))
		523
		524	=item $handle->unshift_read_line ([$eol, ]$cb->($self, $line, $eol))
		525
		526	Append the given callback to the end of the queue (C<push_read_line>) or
		527	prepend it (C<unshift_read_line>).
		528
		529	The callback will be called only once a full line (including the end of
		530	line marker, C<$eol>) has been read. This line (excluding the end of line
		531	marker) will be passed to the callback as second argument (C<$line>), and
		532	the end of line marker as the third argument (C<$eol>).
		533
		534	The end of line marker, C<$eol>, can be either a string, in which case it
		535	will be interpreted as a fixed record end marker, or it can be a regex
		536	object (e.g. created by C<qr>), in which case it is interpreted as a
		537	regular expression.
		538
		539	The end of line marker argument C<$eol> is optional, if it is missing (NOT
		540	undef), then C<qr\|\015?\012\|> is used (which is good for most internet
		541	protocols).
		542
		543	Partial lines at the end of the stream will never be returned, as they are
		544	not marked by the end of line marker.
		545
		546	=cut
		547
		548	sub _read_line($$) {
		549	my $cb = pop;
		550	my $eol = @_ ? shift : qr\|(\015?\012)\|;
		551	my $pos;
		552
		553	$eol = qr\|(\Q$eol\E)\| unless ref $eol;
		554	$eol = qr\|^(.*?)($eol)\|;
		555
		556	sub {
		557	$_[0]{rbuf} =~ s/$eol// or return;
		558
		559	$cb->($1, $2);
		560	1
239	}	561	}
240
241	$self->{on_readline} = $cb;
242
243	$self->on_read (sub {
244	my @lines;
245	push @lines, $1 while $_[0]->{rbuf} =~ s/(.*)$NL//;
246	$self->{on_readline}->($_[0], @lines);
247	});
248	}	562	}
249		563
250	=item B<write ($data)>	564	sub push_read_line {
251
252	=item B<write ($callback)>
253
254	=item B<write ($data, $callback)>
255
256	This method will write C<$data> to the filehandle and call the C<$callback>
257	afterwards. If only C<$callback> is provided it will be called when the
258	write buffer becomes empty the next time (or immediately if it already is empty).
259
260	=cut
261
262	sub write {
263	my ($self, $data, $cb) = @_;
264	if (ref $data) { $cb = $data; undef $data }
265	push @{$self->{write_bufs}}, [$data, $cb];
266	$self->_check_writer;
267	}
268
269	sub _check_writer {
270	my ($self) = @_;	565	my $self = shift;
271		566
272	if ($self->{write_w}) {	567	$self->push_read (&_read_line);
273	unless ($self->{write_cb}) {	568	}
274	while (@{$self->{write_bufs}} && not defined $self->{write_bufs}->[0]->[1]) {
275	my $wba = shift @{$self->{write_bufs}};
276	$self->{wbuf} .= $wba->[0];
277	}
278	}
279	return;
280	}
281		569
282	my $wba = shift @{$self->{write_bufs}}	570	sub unshift_read_line {
283	or return;	571	my $self = shift;
284		572
285	unless (defined $wba->[0]) {	573	$self->unshift_read (&_read_line);
286	$wba->[1]->($self) if $wba->[1];
287	$self->_check_writer;
288	return;
289	}
290
291	$self->{wbuf} = $wba->[0];
292	$self->{write_cb} = $wba->[1];
293
294	$self->{write_w} =
295	AnyEvent->io (poll => 'w', fh => $self->{fh}, cb => sub {
296	my $l = syswrite $self->{fh}, $self->{wbuf}, length $self->{wbuf};
297
298	if (not defined $l) {
299	return if $! == EAGAIN \|\| $! == EINTR;
300	delete $self->{write_w};
301
302	$self->{on_error}->($self, $!) if $self->{on_error};
303
304	} else {
305	substr $self->{wbuf}, 0, $l, '';
306
307	if (length ($self->{wbuf}) == 0) {
308	$self->{write_cb}->($self) if $self->{write_cb};
309
310	delete $self->{write_w};
311	delete $self->{wbuf};
312	delete $self->{write_cb};
313
314	$self->_check_writer;
315	}
316	}
317	});
318	}	574	}
319		575
320	=back	576	=back
321		577
322	=head1 AUTHOR	578	=head1 AUTHOR
323		579
324	Robin Redeker, C<< <elmex at ta-sa.org> >>	580	Robin Redeker C<< <elmex at ta-sa.org> >>, Marc Lehmann <schmorp@schmorp.de>.
325
326	=head1 BUGS
327
328	Please report any bugs or feature requests to
329	C<bug-io-anyevent at rt.cpan.org>, or through the web interface at
330	L<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=IO-AnyEvent>.
331	I will be notified, and then you'll automatically be notified of progress on
332	your bug as I make changes.
333
334	=head1 SUPPORT
335
336	You can find documentation for this module with the perldoc command.
337
338	perldoc AnyEvent::Handle
339
340	You can also look for information at:
341
342	=over 4
343
344	=item * AnnoCPAN: Annotated CPAN documentation
345
346	L<http://annocpan.org/dist/IO-AnyEvent>
347
348	=item * CPAN Ratings
349
350	L<http://cpanratings.perl.org/d/IO-AnyEvent>
351
352	=item * RT: CPAN's request tracker
353
354	L<http://rt.cpan.org/NoAuth/Bugs.html?Dist=IO-AnyEvent>
355
356	=item * Search CPAN
357
358	L<http://search.cpan.org/dist/IO-AnyEvent>
359
360	=back
361
362	=head1 ACKNOWLEDGEMENTS
363
364	=head1 COPYRIGHT & LICENSE
365
366	Copyright 2008 Robin Redeker, all rights reserved.
367
368	This program is free software; you can redistribute it and/or modify it
369	under the same terms as Perl itself.
370		581
371	=cut	582	=cut
372		583
373	1; # End of AnyEvent::Handle	584	1; # End of AnyEvent::Handle

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Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
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Revision 1.9 by root, Fri May 2 16:07:46 2008 UTC