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

Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.5 by elmex, Mon Apr 28 08:01:05 2008 UTC vs.
Revision 1.23 by root, Sat May 24 15:11:22 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 file handles via AnyEvent
13		16
14	=head1 VERSION	17	This module is experimental.
15		18
16	Version 0.01
17
18	=cut	19	=cut
19		20
20	our $VERSION = '0.01';	21	our $VERSION = '0.04';
21		22
22	=head1 SYNOPSIS	23	=head1 SYNOPSIS
23		24
24	use AnyEvent;	25	use AnyEvent;
25	use AnyEvent::Handle;	26	use AnyEvent::Handle;
26		27
27	my $cv = AnyEvent->condvar;	28	my $cv = AnyEvent->condvar;
28		29
29	my $ae_fh = AnyEvent::Handle->new (fh => \*STDIN);	30	my $ae_fh = AnyEvent::Handle->new (fh => \*STDIN);
30		31
31	$ae_fh->on_eof (sub { $cv->broadcast });	32	#TODO
32
33	$ae_fh->readlines (sub {
34	my ($ae_fh, @lines) = @_;
35	for (@lines) {
36	chomp;
37	print "Line: $_";
38	}
39	});
40		33
41	# or use the constructor to pass the callback:	34	# or use the constructor to pass the callback:
42		35
43	my $ae_fh2 =	36	my $ae_fh2 =
44	AnyEvent::Handle->new (	37	AnyEvent::Handle->new (
45	fh => \*STDIN,	38	fh => \*STDIN,
46	on_eof => sub {	39	on_eof => sub {
47	$cv->broadcast;	40	$cv->broadcast;
48	},	41	},
49	on_readline => sub {	42	#TODO
50	my ($ae_fh, @lines) = @_;	43	);
51	for (@lines) {	44
52	chomp;	45	$cv->wait;
53	print "Line: $_";	46
		47	=head1 DESCRIPTION
		48
		49	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	on sockets see L<AnyEvent::Util>.
		52
		53	In the following, when the documentation refers to of "bytes" then this
		54	means characters. As sysread and syswrite are used for all I/O, their
		55	treatment of characters applies to this module as well.
		56
		57	All callbacks will be invoked with the handle object as their first
		58	argument.
		59
		60	=head1 METHODS
		61
		62	=over 4
		63
		64	=item B<new (%args)>
		65
		66	The constructor supports these arguments (all as key => value pairs).
		67
		68	=over 4
		69
		70	=item fh => $filehandle [MANDATORY]
		71
		72	The filehandle this L<AnyEvent::Handle> object will operate on.
		73
		74	NOTE: The filehandle will be set to non-blocking (using
		75	AnyEvent::Util::fh_nonblocking).
		76
		77	=item on_eof => $cb->($self)
		78
		79	Set the callback to be called on EOF.
		80
		81	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
		83	waiting for data.
		84
		85	=item on_error => $cb->($self)
		86
		87	This is the fatal error callback, that is called when, well, a fatal error
		88	occurs, such as not being able to resolve the hostname, failure to connect
		89	or a read error.
		90
		91	The object will not be in a usable state when this callback has been
		92	called.
		93
		94	On callback entrance, the value of C<$!> contains the operating system
		95	error (or C<ENOSPC> or C<EPIPE>).
		96
		97	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
		99	die.
		100
		101	=item on_read => $cb->($self)
		102
		103	This sets the default read callback, which is called when data arrives
		104	and no read request is in the queue.
		105
		106	To access (and remove data from) the read buffer, use the C<< ->rbuf >>
		107	method or access the C<$self->{rbuf}> member directly.
		108
		109	When an EOF condition is detected then AnyEvent::Handle will first try to
		110	feed all the remaining data to the queued callbacks and C<on_read> before
		111	calling the C<on_eof> callback. If no progress can be made, then a fatal
		112	error will be raised (with C<$!> set to C<EPIPE>).
		113
		114	=item on_drain => $cb->()
		115
		116	This sets the callback that is called when the write buffer becomes empty
		117	(or when the callback is set and the buffer is empty already).
		118
		119	To append to the write buffer, use the C<< ->push_write >> method.
		120
		121	=item rbuf_max => <bytes>
		122
		123	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)
		124	when the read buffer ever (strictly) exceeds this size. This is useful to
		125	avoid denial-of-service attacks.
		126
		127	For example, a server accepting connections from untrusted sources should
		128	be configured to accept only so-and-so much data that it cannot act on
		129	(for example, when expecting a line, an attacker could send an unlimited
		130	amount of data without a callback ever being called as long as the line
		131	isn't finished).
		132
		133	=item read_size => <bytes>
		134
		135	The default read block size (the amount of bytes this module will try to read
		136	on each [loop iteration). Default: C<4096>.
		137
		138	=item low_water_mark => <bytes>
		139
		140	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
		142	considered empty.
		143
		144	=item tls => "accept" \| "connect" \| Net::SSLeay::SSL object
		145
		146	When this parameter is given, it enables TLS (SSL) mode, that means it
		147	will start making tls handshake and will transparently encrypt/decrypt
		148	data.
		149
		150	For the TLS server side, use C<accept>, and for the TLS client side of a
		151	connection, use C<connect> mode.
		152
		153	You can also provide your own TLS connection object, but you have
		154	to make sure that you call either C<Net::SSLeay::set_connect_state>
		155	or C<Net::SSLeay::set_accept_state> on it before you pass it to
		156	AnyEvent::Handle.
		157
		158	=item tls_ctx => $ssl_ctx
		159
		160	Use the given Net::SSLeay::CTX object to create the new TLS connection
		161	(unless a connection object was specified directly). If this parameter is
		162	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.
		163
		164	=back
		165
		166	=cut
		167
		168	sub new {
		169	my $class = shift;
		170
		171	my $self = bless { @_ }, $class;
		172
		173	$self->{fh} or Carp::croak "mandatory argument fh is missing";
		174
		175	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;
		176
		177	if ($self->{tls}) {
		178	require Net::SSLeay;
		179	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx});
		180	}
		181
		182	$self->on_eof (delete $self->{on_eof} ) if $self->{on_eof};
		183	$self->on_error (delete $self->{on_error}) if $self->{on_error};
		184	$self->on_drain (delete $self->{on_drain}) if $self->{on_drain};
		185	$self->on_read (delete $self->{on_read} ) if $self->{on_read};
		186
		187	$self->start_read;
		188
		189	$self
		190	}
		191
		192	sub _shutdown {
		193	my ($self) = @_;
		194
		195	delete $self->{rw};
		196	delete $self->{ww};
		197	delete $self->{fh};
		198	}
		199
		200	sub error {
		201	my ($self) = @_;
		202
		203	{
		204	local $!;
		205	$self->_shutdown;
		206	}
		207
		208	if ($self->{on_error}) {
		209	$self->{on_error}($self);
		210	} else {
		211	die "AnyEvent::Handle uncaught fatal error: $!";
		212	}
		213	}
		214
		215	=item $fh = $handle->fh
		216
		217	This method returns the file handle of the L<AnyEvent::Handle> object.
		218
		219	=cut
		220
		221	sub fh { $_[0]->{fh} }
		222
		223	=item $handle->on_error ($cb)
		224
		225	Replace the current C<on_error> callback (see the C<on_error> constructor argument).
		226
		227	=cut
		228
		229	sub on_error {
		230	$_[0]{on_error} = $_[1];
		231	}
		232
		233	=item $handle->on_eof ($cb)
		234
		235	Replace the current C<on_eof> callback (see the C<on_eof> constructor argument).
		236
		237	=cut
		238
		239	sub on_eof {
		240	$_[0]{on_eof} = $_[1];
		241	}
		242
		243	#############################################################################
		244
		245	=back
		246
		247	=head2 WRITE QUEUE
		248
		249	AnyEvent::Handle manages two queues per handle, one for writing and one
		250	for reading.
		251
		252	The write queue is very simple: you can add data to its end, and
		253	AnyEvent::Handle will automatically try to get rid of it for you.
		254
		255	When data could be written and the write buffer is shorter then the low
		256	water mark, the C<on_drain> callback will be invoked.
		257
		258	=over 4
		259
		260	=item $handle->on_drain ($cb)
		261
		262	Sets the C<on_drain> callback or clears it (see the description of
		263	C<on_drain> in the constructor).
		264
		265	=cut
		266
		267	sub on_drain {
		268	my ($self, $cb) = @_;
		269
		270	$self->{on_drain} = $cb;
		271
		272	$cb->($self)
		273	if $cb && $self->{low_water_mark} >= length $self->{wbuf};
		274	}
		275
		276	=item $handle->push_write ($data)
		277
		278	Queues the given scalar to be written. You can push as much data as you
		279	want (only limited by the available memory), as C<AnyEvent::Handle>
		280	buffers it independently of the kernel.
		281
		282	=cut
		283
		284	sub _drain_wbuf {
		285	my ($self) = @_;
		286
		287	unless ($self->{ww}) {
		288	Scalar::Util::weaken $self;
		289	my $cb = sub {
		290	my $len = syswrite $self->{fh}, $self->{wbuf};
		291
		292	if ($len > 0) {
		293	substr $self->{wbuf}, 0, $len, "";
		294
		295	$self->{on_drain}($self)
		296	if $self->{low_water_mark} >= length $self->{wbuf}
		297	&& $self->{on_drain};
		298
		299	delete $self->{ww} unless length $self->{wbuf};
		300	} elsif ($! != EAGAIN && $! != EINTR) {
		301	$self->error;
		302	}
		303	};
		304
		305	$self->{ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb);
		306
		307	$cb->($self);
		308	};
		309	}
		310
		311	sub push_write {
		312	my $self = shift;
		313
		314	if ($self->{filter_w}) {
		315	$self->{filter_w}->($self, \$_[0]);
		316	} else {
		317	$self->{wbuf} .= $_[0];
		318	$self->_drain_wbuf;
		319	}
		320	}
		321
		322	#############################################################################
		323
		324	=back
		325
		326	=head2 READ QUEUE
		327
		328	AnyEvent::Handle manages two queues per handle, one for writing and one
		329	for reading.
		330
		331	The read queue is more complex than the write queue. It can be used in two
		332	ways, the "simple" way, using only C<on_read> and the "complex" way, using
		333	a queue.
		334
		335	In the simple case, you just install an C<on_read> callback and whenever
		336	new data arrives, it will be called. You can then remove some data (if
		337	enough is there) from the read buffer (C<< $handle->rbuf >>) if you want
		338	or not.
		339
		340	In the more complex case, you want to queue multiple callbacks. In this
		341	case, AnyEvent::Handle will call the first queued callback each time new
		342	data arrives and removes it when it has done its job (see C<push_read>,
		343	below).
		344
		345	This way you can, for example, push three line-reads, followed by reading
		346	a chunk of data, and AnyEvent::Handle will execute them in order.
		347
		348	Example 1: EPP protocol parser. EPP sends 4 byte length info, followed by
		349	the specified number of bytes which give an XML datagram.
		350
		351	# in the default state, expect some header bytes
		352	$handle->on_read (sub {
		353	# some data is here, now queue the length-header-read (4 octets)
		354	shift->unshift_read_chunk (4, sub {
		355	# header arrived, decode
		356	my $len = unpack "N", $_[1];
		357
		358	# now read the payload
		359	shift->unshift_read_chunk ($len, sub {
		360	my $xml = $_[1];
		361	# handle xml
		362	});
		363	});
		364	});
		365
		366	Example 2: Implement a client for a protocol that replies either with
		367	"OK" and another line or "ERROR" for one request, and 64 bytes for the
		368	second request. Due tot he availability of a full queue, we can just
		369	pipeline sending both requests and manipulate the queue as necessary in
		370	the callbacks:
		371
		372	# request one
		373	$handle->push_write ("request 1\015\012");
		374
		375	# we expect "ERROR" or "OK" as response, so push a line read
		376	$handle->push_read_line (sub {
		377	# if we got an "OK", we have to _prepend_ another line,
		378	# so it will be read before the second request reads its 64 bytes
		379	# which are already in the queue when this callback is called
		380	# we don't do this in case we got an error
		381	if ($_[1] eq "OK") {
		382	$_[0]->unshift_read_line (sub {
		383	my $response = $_[1];
		384	...
		385	});
		386	}
		387	});
		388
		389	# request two
		390	$handle->push_write ("request 2\015\012");
		391
		392	# simply read 64 bytes, always
		393	$handle->push_read_chunk (64, sub {
		394	my $response = $_[1];
		395	...
		396	});
		397
		398	=over 4
		399
		400	=cut
		401
		402	sub _drain_rbuf {
		403	my ($self) = @_;
		404
		405	if (
		406	defined $self->{rbuf_max}
		407	&& $self->{rbuf_max} < length $self->{rbuf}
		408	) {
		409	$! = &Errno::ENOSPC; return $self->error;
		410	}
		411
		412	return if $self->{in_drain};
		413	local $self->{in_drain} = 1;
		414
		415	while (my $len = length $self->{rbuf}) {
		416	no strict 'refs';
		417	if (my $cb = shift @{ $self->{queue} }) {
		418	if (!$cb->($self)) {
		419	if ($self->{eof}) {
		420	# no progress can be made (not enough data and no data forthcoming)
		421	$! = &Errno::EPIPE; return $self->error;
54	}	422	}
		423
		424	unshift @{ $self->{queue} }, $cb;
		425	return;
55	}	426	}
56	);
57
58	$cv->wait;
59
60	=head1 DESCRIPTION
61
62	This module is a helper module to make it easier to do non-blocking I/O
63	on filehandles (and sockets, see L<AnyEvent::Socket>).
64
65	The event loop is provided by L<AnyEvent>.
66
67	=head1 METHODS
68
69	=over 4
70
71	=item B<new (%args)>
72
73	The constructor has these arguments:
74
75	=over 4
76
77	=item fh => $filehandle
78
79	The filehandle this L<AnyEvent::Handle> object will operate on.
80
81	NOTE: The filehandle will be set to non-blocking.
82
83	=item read_block_size => $size
84
85	The default read block size use for reads via the C<on_read>
86	method.
87
88	=item on_read => $cb
89
90	=item on_eof => $cb
91
92	=item on_error => $cb
93
94	These are shortcuts, that will call the corresponding method and set the callback to C<$cb>.
95
96	=item on_readline => $cb
97
98	The C<readlines> method is called with the default seperator and C<$cb> as callback
99	for you.
100
101	=back
102
103	=cut
104
105	sub new {
106	my $this = shift;
107	my $class = ref($this) \|\| $this;
108	my $self = {
109	read_block_size => 4096,
110	rbuf => '',
111	@_
112	};
113	bless $self, $class;
114
115	$self->{fh}->blocking (0) if $self->{fh};
116
117	if ($self->{on_read}) {
118	$self->on_read ($self->{on_read});
119
120	} elsif ($self->{on_readline}) {	427	} elsif ($self->{on_read}) {
121	$self->readlines ($self->{on_readline});	428	$self->{on_read}($self);
122		429
		430	if (
		431	$self->{eof} # if no further data will arrive
		432	&& $len == length $self->{rbuf} # and no data has been consumed
		433	&& !@{ $self->{queue} } # and the queue is still empty
		434	&& $self->{on_read} # and we still want to read data
		435	) {
		436	# then no progress can be made
		437	$! = &Errno::EPIPE; return $self->error;
		438	}
		439	} else {
		440	# read side becomes idle
		441	delete $self->{rw};
		442	return;
		443	}
		444	}
		445
123	} elsif ($self->{on_eof}) {	446	if ($self->{eof}) {
124	$self->on_eof ($self->{on_eof});	447	$self->_shutdown;
125		448	$self->{on_eof}($self)
126	} elsif ($self->{on_error}) {	449	if $self->{on_eof};
127	$self->on_eof ($self->{on_error});
128	}	450	}
129
130	return $self
131	}	451	}
132		452
133	=item B<fh>	453	=item $handle->on_read ($cb)
134		454
135	This method returns the filehandle of the L<AnyEvent::Handle> object.	455	This replaces the currently set C<on_read> callback, or clears it (when
136		456	the new callback is C<undef>). See the description of C<on_read> in the
137	=cut	457	constructor.
138
139	sub fh { $_[0]->{fh} }
140
141	=item B<on_read ($callback)>
142
143	This method installs a C<$callback> that will be called
144	when new data arrived. You can access the read buffer via the C<rbuf>
145	method (see below).
146
147	The first argument of the C<$callback> will be the L<AnyEvent::Handle> object.
148		458
149	=cut	459	=cut
150		460
151	sub on_read {	461	sub on_read {
152	my ($self, $cb) = @_;	462	my ($self, $cb) = @_;
		463
153	$self->{on_read} = $cb;	464	$self->{on_read} = $cb;
		465	}
154		466
155	unless (defined $self->{on_read}) {	467	=item $handle->rbuf
		468
		469	Returns the read buffer (as a modifiable lvalue).
		470
		471	You can access the read buffer directly as the C<< ->{rbuf} >> member, if
		472	you want.
		473
		474	NOTE: The read buffer should only be used or modified if the C<on_read>,
		475	C<push_read> or C<unshift_read> methods are used. The other read methods
		476	automatically manage the read buffer.
		477
		478	=cut
		479
		480	sub rbuf : lvalue {
		481	$_[0]{rbuf}
		482	}
		483
		484	=item $handle->push_read ($cb)
		485
		486	=item $handle->unshift_read ($cb)
		487
		488	Append the given callback to the end of the queue (C<push_read>) or
		489	prepend it (C<unshift_read>).
		490
		491	The callback is called each time some additional read data arrives.
		492
		493	It must check whether enough data is in the read buffer already.
		494
		495	If not enough data is available, it must return the empty list or a false
		496	value, in which case it will be called repeatedly until enough data is
		497	available (or an error condition is detected).
		498
		499	If enough data was available, then the callback must remove all data it is
		500	interested in (which can be none at all) and return a true value. After returning
		501	true, it will be removed from the queue.
		502
		503	=cut
		504
		505	sub push_read {
		506	my ($self, $cb) = @_;
		507
		508	push @{ $self->{queue} }, $cb;
		509	$self->_drain_rbuf;
		510	}
		511
		512	sub unshift_read {
		513	my ($self, $cb) = @_;
		514
		515	push @{ $self->{queue} }, $cb;
		516	$self->_drain_rbuf;
		517	}
		518
		519	=item $handle->push_read_chunk ($len, $cb->($self, $data))
		520
		521	=item $handle->unshift_read_chunk ($len, $cb->($self, $data))
		522
		523	Append the given callback to the end of the queue (C<push_read_chunk>) or
		524	prepend it (C<unshift_read_chunk>).
		525
		526	The callback will be called only once C<$len> bytes have been read, and
		527	these C<$len> bytes will be passed to the callback.
		528
		529	=cut
		530
		531	sub _read_chunk($$) {
		532	my ($self, $len, $cb) = @_;
		533
		534	sub {
		535	$len <= length $_[0]{rbuf} or return;
		536	$cb->($_[0], substr $_[0]{rbuf}, 0, $len, "");
		537	1
		538	}
		539	}
		540
		541	sub push_read_chunk {
		542	$_[0]->push_read (&_read_chunk);
		543	}
		544
		545
		546	sub unshift_read_chunk {
		547	$_[0]->unshift_read (&_read_chunk);
		548	}
		549
		550	=item $handle->push_read_line ([$eol, ]$cb->($self, $line, $eol))
		551
		552	=item $handle->unshift_read_line ([$eol, ]$cb->($self, $line, $eol))
		553
		554	Append the given callback to the end of the queue (C<push_read_line>) or
		555	prepend it (C<unshift_read_line>).
		556
		557	The callback will be called only once a full line (including the end of
		558	line marker, C<$eol>) has been read. This line (excluding the end of line
		559	marker) will be passed to the callback as second argument (C<$line>), and
		560	the end of line marker as the third argument (C<$eol>).
		561
		562	The end of line marker, C<$eol>, can be either a string, in which case it
		563	will be interpreted as a fixed record end marker, or it can be a regex
		564	object (e.g. created by C<qr>), in which case it is interpreted as a
		565	regular expression.
		566
		567	The end of line marker argument C<$eol> is optional, if it is missing (NOT
		568	undef), then C<qr\|\015?\012\|> is used (which is good for most internet
		569	protocols).
		570
		571	Partial lines at the end of the stream will never be returned, as they are
		572	not marked by the end of line marker.
		573
		574	=cut
		575
		576	sub _read_line($$) {
		577	my $self = shift;
		578	my $cb = pop;
		579	my $eol = @_ ? shift : qr\|(\015?\012)\|;
		580	my $pos;
		581
		582	$eol = quotemeta $eol unless ref $eol;
		583	$eol = qr\|^(.*?)($eol)\|s;
		584
		585	sub {
		586	$_[0]{rbuf} =~ s/$eol// or return;
		587
		588	$cb->($_[0], $1, $2);
		589	1
		590	}
		591	}
		592
		593	sub push_read_line {
		594	$_[0]->push_read (&_read_line);
		595	}
		596
		597	sub unshift_read_line {
		598	$_[0]->unshift_read (&_read_line);
		599	}
		600
		601	=item $handle->stop_read
		602
		603	=item $handle->start_read
		604
		605	In rare cases you actually do not want to read anything from the
		606	socket. In this case you can call C<stop_read>. Neither C<on_read> no
		607	any queued callbacks will be executed then. To start reading again, call
		608	C<start_read>.
		609
		610	=cut
		611
		612	sub stop_read {
		613	my ($self) = @_;
		614
156	delete $self->{on_read_w};	615	delete $self->{rw};
157	return;	616	}
158	}	617
159		618	sub start_read {
160	$self->{on_read_w} =	619	my ($self) = @_;
161	AnyEvent->io (poll => 'r', fh => $self->{fh}, cb => sub {	620
162	#d# warn "READ:[$self->{read_size}] $self->{read_block_size} : ".length ($self->{rbuf})."\n";	621	unless ($self->{rw} \|\| $self->{eof}) {
163	my $rbuf_len = length $self->{rbuf};	622	Scalar::Util::weaken $self;
164	my $l;	623
165	if (defined $self->{read_size}) {	624	$self->{rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {
166	$l = sysread $self->{fh}, $self->{rbuf},	625	my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf};
167	($self->{read_size} - $rbuf_len), $rbuf_len;
168	} else {
169	$l = sysread $self->{fh}, $self->{rbuf}, $self->{read_block_size}, $rbuf_len;	626	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} \|\| 8192, length $$rbuf;
170	}
171	#d# warn "READL $l [$self->{rbuf}]\n";
172		627
		628	if ($len > 0) {
		629	$self->{filter_r}
		630	? $self->{filter_r}->($self, $rbuf)
		631	: $self->_drain_rbuf;
		632
173	if (not defined $l) {	633	} elsif (defined $len) {
174	return if $! == EAGAIN \|\| $! == EINTR;
175	$self->{on_error}->($self) if $self->{on_error};
176	delete $self->{on_read_w};	634	delete $self->{rw};
		635	$self->{eof} = 1;
		636	$self->_drain_rbuf;
177		637
178	} elsif ($l == 0) {	638	} elsif ($! != EAGAIN && $! != EINTR) {
179	$self->{on_eof}->($self) if $self->{on_eof};	639	return $self->error;
180	delete $self->{on_read_w};
181
182	} else {
183	$self->{on_read}->($self);
184	}	640	}
185	});	641	});
		642	}
186	}	643	}
187		644
188	=item B<on_error ($callback)>	645	sub _dotls {
189
190	Whenever a read or write operation resulted in an error the C<$callback>
191	will be called.
192
193	The first argument of C<$callback> will be the L<AnyEvent::Handle> object itself.
194	The error is given as errno in C<$!>.
195
196	=cut
197
198	sub on_error {
199	$_[0]->{on_error} = $_[1];
200	}
201
202	=item B<on_eof ($callback)>
203
204	Installs the C<$callback> that will be called when the end of file is
205	encountered in a read operation this C<$callback> will be called. The first
206	argument will be the L<AnyEvent::Handle> object itself.
207
208	=cut
209
210	sub on_eof {
211	$_[0]->{on_eof} = $_[1];
212	}
213
214	=item B<rbuf>
215
216	Returns a reference to the read buffer.
217
218	NOTE: The read buffer should only be used or modified if the C<on_read>
219	method is used directly. The C<read> and C<readlines> methods will provide
220	the read data to their callbacks.
221
222	=cut
223
224	sub rbuf : lvalue {
225	$_[0]->{rbuf}
226	}
227
228	=item B<read ($len, $callback)>
229
230	Will read exactly C<$len> bytes from the filehandle and call the C<$callback>
231	if done so. The first argument to the C<$callback> will be the L<AnyEvent::Handle>
232	object itself and the second argument the read data.
233
234	NOTE: This method will override any callbacks installed via the C<on_read> method.
235
236	=cut
237
238	sub read {
239	my ($self, $len, $cb) = @_;	646	my ($self) = @_;
240		647
241	$self->{read_cb} = $cb;	648	if (length $self->{tls_wbuf}) {
242	my $old_blk_size = $self->{read_block_size};	649	while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{tls_wbuf})) > 0) {
243	$self->{read_block_size} = $len;	650	substr $self->{tls_wbuf}, 0, $len, "";
244
245	$self->on_read (sub {
246	#d# warn "OFOFO $len \|\| ".length($_[0]->{rbuf})."\|\|\n";
247
248	if ($len == length $_[0]->{rbuf}) {
249	$_[0]->{read_block_size} = $old_blk_size;
250	$_[0]->on_read (undef);
251	$_[0]->{read_cb}->($_[0], (substr $self->{rbuf}, 0, $len, ''));
252	}	651	}
253	});	652	}
254	}
255		653
256	=item B<readlines ($callback)>	654	if (defined (my $buf = Net::SSLeay::BIO_read ($self->{tls_wbio}))) {
257		655	$self->{wbuf} .= $buf;
258	=item B<readlines ($sep, $callback)>	656	$self->_drain_wbuf;
259
260	This method will read lines from the filehandle, seperated by C<$sep> or C<"\n">
261	if C<$sep> is not provided. C<$sep> will be used as "line" seperator.
262
263	The C<$callback> will be called when at least one
264	line could be read. The first argument to the C<$callback> will be the L<AnyEvent::Handle>
265	object itself and the rest of the arguments will be the read lines.
266
267	NOTE: This method will override any callbacks installed via the C<on_read> method.
268
269	=cut
270
271	sub readlines {
272	my ($self, $sep, $cb) = @_;
273
274	if (ref $sep) {
275	$cb = $sep;
276	$sep = "\n";
277
278	} elsif (not defined $sep) {
279	$sep = "\n";
280	}	657	}
281		658
282	my $sep_len = length $sep;	659	while (defined (my $buf = Net::SSLeay::read ($self->{tls}))) {
		660	$self->{rbuf} .= $buf;
		661	$self->_drain_rbuf;
		662	}
283		663
284	$self->{on_readline} = $cb;	664	if (
285		665	(my $err = Net::SSLeay::get_error ($self->{tls}, -1))
286	$self->on_read (sub {	666	!= Net::SSLeay::ERROR_WANT_READ ()
287	my @lines;	667	) {
288	my $rb = \$_[0]->{rbuf};	668	if ($err == Net::SSLeay::ERROR_SYSCALL ()) {
289	my $pos;	669	$self->error;
290	while (($pos = index ($$rb, $sep)) >= 0) {	670	} elsif ($err == Net::SSLeay::ERROR_SSL ()) {
291	push @lines, substr $$rb, 0, $pos + $sep_len, '';	671	$! = &Errno::EIO;
		672	$self->error;
292	}	673	}
293	$self->{on_readline}->($_[0], @lines);	674
		675	# all others are fine for our purposes
		676	}
		677	}
		678
		679	# TODO: maybe document...
		680	sub starttls {
		681	my ($self, $ssl, $ctx) = @_;
		682
		683	if ($ssl eq "accept") {
		684	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());
		685	Net::SSLeay::set_accept_state ($ssl);
		686	} elsif ($ssl eq "connect") {
		687	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());
		688	Net::SSLeay::set_connect_state ($ssl);
		689	}
		690
		691	$self->{tls} = $ssl;
		692
		693	# basically, this is deep magic (because SSL_read should have the same issues)
		694	# but the openssl maintainers basically said: "trust us, it just works".
		695	# (unfortunately, we have to hardcode constants because the abysmally misdesigned
		696	# and mismaintained ssleay-module doesn't even offer them).
		697	Net::SSLeay::CTX_set_mode ($self->{tls},
		698	(eval { Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } \|\| 1)
		699	\| (eval { Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } \|\| 2));
		700
		701	$self->{tls_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
		702	$self->{tls_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
		703
		704	Net::SSLeay::set_bio ($ssl, $self->{tls_rbio}, $self->{tls_wbio});
		705
		706	$self->{filter_w} = sub {
		707	$_[0]{tls_wbuf} .= ${$_[1]};
		708	&_dotls;
294	});	709	};
295	}	710	$self->{filter_r} = sub {
296		711	Net::SSLeay::BIO_write ($_[0]{tls_rbio}, ${$_[1]});
297	=item B<write ($data)>	712	&_dotls;
298
299	=item B<write ($callback)>
300
301	=item B<write ($data, $callback)>
302
303	This method will write C<$data> to the filehandle and call the C<$callback>
304	afterwards. If only C<$callback> is provided it will be called when the
305	write buffer becomes empty the next time (or immediately if it already is empty).
306
307	=cut
308
309	sub write {
310	my ($self, $data, $cb) = @_;
311	if (ref $data) { $cb = $data; undef $data }
312	push @{$self->{write_bufs}}, [$data, $cb];
313	$self->_check_writer;
314	}
315
316	sub _check_writer {
317	my ($self) = @_;
318
319	if ($self->{write_w}) {
320	unless ($self->{write_cb}) {
321	while (@{$self->{write_bufs}} && not defined $self->{write_bufs}->[0]->[1]) {
322	my $wba = shift @{$self->{write_bufs}};
323	$self->{wbuf} .= $wba->[0];
324	}
325	}
326	return;
327	}	713	};
		714	}
328		715
329	my $wba = shift @{$self->{write_bufs}}	716	sub DESTROY {
330	or return;	717	my $self = shift;
331		718
332	unless (defined $wba->[0]) {	719	Net::SSLeay::free (delete $self->{tls}) if $self->{tls};
333	$wba->[1]->($self) if $wba->[1];	720	}
334	$self->_check_writer;
335	return;
336	}
337		721
338	$self->{wbuf} = $wba->[0];	722	=item AnyEvent::Handle::TLS_CTX
339	$self->{write_cb} = $wba->[1];
340		723
341	$self->{write_w} =	724	This function creates and returns the Net::SSLeay::CTX object used by
342	AnyEvent->io (poll => 'w', fh => $self->{fh}, cb => sub {	725	default for TLS mode.
343	my $l = syswrite $self->{fh}, $self->{wbuf}, length $self->{wbuf};
344		726
345	if (not defined $l) {	727	The context is created like this:
346	return if $! == EAGAIN \|\| $! == EINTR;
347	delete $self->{write_w};
348	$self->{on_error}->($self) if $self->{on_error};
349		728
350	} else {	729	Net::SSLeay::load_error_strings;
351	substr $self->{wbuf}, 0, $l, '';	730	Net::SSLeay::SSLeay_add_ssl_algorithms;
		731	Net::SSLeay::randomize;
352		732
353	if (length ($self->{wbuf}) == 0) {	733	my $CTX = Net::SSLeay::CTX_new;
354	$self->{write_cb}->($self) if $self->{write_cb};
355		734
356	delete $self->{write_w};	735	Net::SSLeay::CTX_set_options $CTX, Net::SSLeay::OP_ALL
357	delete $self->{wbuf};
358	delete $self->{write_cb};
359		736
360	$self->_check_writer;	737	=cut
361	}	738
362	}	739	our $TLS_CTX;
363	});	740
		741	sub TLS_CTX() {
		742	$TLS_CTX \|\| do {
		743	require Net::SSLeay;
		744
		745	Net::SSLeay::load_error_strings ();
		746	Net::SSLeay::SSLeay_add_ssl_algorithms ();
		747	Net::SSLeay::randomize ();
		748
		749	$TLS_CTX = Net::SSLeay::CTX_new ();
		750
		751	Net::SSLeay::CTX_set_options ($TLS_CTX, Net::SSLeay::OP_ALL ());
		752
		753	$TLS_CTX
		754	}
364	}	755	}
365		756
366	=back	757	=back
367		758
368	=head1 AUTHOR	759	=head1 AUTHOR
369		760
370	Robin Redeker, C<< <elmex at ta-sa.org> >>	761	Robin Redeker C<< <elmex at ta-sa.org> >>, Marc Lehmann <schmorp@schmorp.de>.
371		762
372	=cut	763	=cut
373		764
374	1; # End of AnyEvent::Handle	765	1; # End of AnyEvent::Handle

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Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents): Revision 1.5 by elmex, Mon Apr 28 08:01:05 2008 UTC vs. Revision 1.23 by root, Sat May 24 15:11:22 2008 UTC

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Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.5 by elmex, Mon Apr 28 08:01:05 2008 UTC vs.
Revision 1.23 by root, Sat May 24 15:11:22 2008 UTC