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Revision 1.113 by root, Wed Jan 21 06:02:21 2009 UTC vs.
Revision 1.180 by root, Thu Aug 20 22:58:35 2009 UTC

1	package AnyEvent::Handle;
2
3	no warnings;
4	use strict qw(subs vars);
5
6	use AnyEvent ();
7	use AnyEvent::Util qw(WSAEWOULDBLOCK);
8	use Scalar::Util ();
9	use Carp ();
10	use Fcntl ();
11	use Errno qw(EAGAIN EINTR);
12
13	=head1 NAME	1	=head1 NAME
14		2
15	AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent	3	AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent
16
17	=cut
18
19	our $VERSION = 4.331;
20		4
21	=head1 SYNOPSIS	5	=head1 SYNOPSIS
22		6
23	use AnyEvent;	7	use AnyEvent;
24	use AnyEvent::Handle;	8	use AnyEvent::Handle;
25		9
26	my $cv = AnyEvent->condvar;	10	my $cv = AnyEvent->condvar;
27		11
28	my $handle =	12	my $hdl; $hdl = new AnyEvent::Handle
29	AnyEvent::Handle->new (
30	fh => \*STDIN,	13	fh => \*STDIN,
31	on_eof => sub {	14	on_error => sub {
		15	my ($hdl, $fatal, $msg) = @_;
		16	warn "got error $msg\n";
		17	$hdl->destroy;
32	$cv->send;	18	$cv->send;
33	},
34	);	19	);
35		20
36	# send some request line	21	# send some request line
37	$handle->push_write ("getinfo\015\012");	22	$hdl->push_write ("getinfo\015\012");
38		23
39	# read the response line	24	# read the response line
40	$handle->push_read (line => sub {	25	$hdl->push_read (line => sub {
41	my ($handle, $line) = @_;	26	my ($hdl, $line) = @_;
42	warn "read line <$line>\n";	27	warn "got line <$line>\n";
43	$cv->send;	28	$cv->send;
44	});	29	});
45		30
46	$cv->recv;	31	$cv->recv;
47		32
48	=head1 DESCRIPTION	33	=head1 DESCRIPTION
49		34
50	This module is a helper module to make it easier to do event-based I/O on	35	This module is a helper module to make it easier to do event-based I/O on
51	filehandles. For utility functions for doing non-blocking connects and accepts	36	filehandles.
52	on sockets see L<AnyEvent::Util>.
53		37
54	The L<AnyEvent::Intro> tutorial contains some well-documented	38	The L<AnyEvent::Intro> tutorial contains some well-documented
55	AnyEvent::Handle examples.	39	AnyEvent::Handle examples.
56		40
57	In the following, when the documentation refers to of "bytes" then this	41	In the following, when the documentation refers to of "bytes" then this
58	means characters. As sysread and syswrite are used for all I/O, their	42	means characters. As sysread and syswrite are used for all I/O, their
59	treatment of characters applies to this module as well.	43	treatment of characters applies to this module as well.
60		44
		45	At the very minimum, you should specify C<fh> or C<connect>, and the
		46	C<on_error> callback.
		47
61	All callbacks will be invoked with the handle object as their first	48	All callbacks will be invoked with the handle object as their first
62	argument.	49	argument.
63		50
		51	=cut
		52
		53	package AnyEvent::Handle;
		54
		55	use Scalar::Util ();
		56	use List::Util ();
		57	use Carp ();
		58	use Errno qw(EAGAIN EINTR);
		59
		60	use AnyEvent (); BEGIN { AnyEvent::common_sense }
		61	use AnyEvent::Util qw(WSAEWOULDBLOCK);
		62
		63	our $VERSION = $AnyEvent::VERSION;
		64
64	=head1 METHODS	65	=head1 METHODS
65		66
66	=over 4	67	=over 4
67		68
68	=item B<new (%args)>	69	=item $handle = B<new> AnyEvent::TLS fh => $filehandle, key => value...
69		70
70	The constructor supports these arguments (all as key => value pairs).	71	The constructor supports these arguments (all as C<< key => value >> pairs).
71		72
72	=over 4	73	=over 4
73		74
74	=item fh => $filehandle [MANDATORY]	75	=item fh => $filehandle [C<fh> or C<connect> MANDATORY]
75		76
76	The filehandle this L<AnyEvent::Handle> object will operate on.	77	The filehandle this L<AnyEvent::Handle> object will operate on.
77
78	NOTE: The filehandle will be set to non-blocking mode (using	78	NOTE: The filehandle will be set to non-blocking mode (using
79	C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in	79	C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in
80	that mode.	80	that mode.
81		81
		82	=item connect => [$host, $service] [C<fh> or C<connect> MANDATORY]
		83
		84	Try to connect to the specified host and service (port), using
		85	C<AnyEvent::Socket::tcp_connect>. The C<$host> additionally becomes the
		86	default C<peername>.
		87
		88	You have to specify either this parameter, or C<fh>, above.
		89
		90	It is possible to push requests on the read and write queues, and modify
		91	properties of the stream, even while AnyEvent::Handle is connecting.
		92
		93	When this parameter is specified, then the C<on_prepare>,
		94	C<on_connect_error> and C<on_connect> callbacks will be called under the
		95	appropriate circumstances:
		96
		97	=over 4
		98
		99	=item on_prepare => $cb->($handle)
		100
		101	This (rarely used) callback is called before a new connection is
		102	attempted, but after the file handle has been created. It could be used to
		103	prepare the file handle with parameters required for the actual connect
		104	(as opposed to settings that can be changed when the connection is already
		105	established).
		106
		107	The return value of this callback should be the connect timeout value in
		108	seconds (or C<0>, or C<undef>, or the empty list, to indicate the default
		109	timeout is to be used).
		110
		111	=item on_connect => $cb->($handle, $host, $port, $retry->())
		112
		113	This callback is called when a connection has been successfully established.
		114
		115	The actual numeric host and port (the socket peername) are passed as
		116	parameters, together with a retry callback.
		117
		118	When, for some reason, the handle is not acceptable, then calling
		119	C<$retry> will continue with the next conenction target (in case of
		120	multi-homed hosts or SRV records there can be multiple connection
		121	endpoints). When it is called then the read and write queues, eof status,
		122	tls status and similar properties of the handle are being reset.
		123
		124	In most cases, ignoring the C<$retry> parameter is the way to go.
		125
		126	=item on_connect_error => $cb->($handle, $message)
		127
		128	This callback is called when the conenction could not be
		129	established. C<$!> will contain the relevant error code, and C<$message> a
		130	message describing it (usually the same as C<"$!">).
		131
		132	If this callback isn't specified, then C<on_error> will be called with a
		133	fatal error instead.
		134
		135	=back
		136
		137	=item on_error => $cb->($handle, $fatal, $message)
		138
		139	This is the error callback, which is called when, well, some error
		140	occured, such as not being able to resolve the hostname, failure to
		141	connect or a read error.
		142
		143	Some errors are fatal (which is indicated by C<$fatal> being true). On
		144	fatal errors the handle object will be destroyed (by a call to C<< ->
		145	destroy >>) after invoking the error callback (which means you are free to
		146	examine the handle object). Examples of fatal errors are an EOF condition
		147	with active (but unsatisifable) read watchers (C<EPIPE>) or I/O errors. In
		148	cases where the other side can close the connection at their will it is
		149	often easiest to not report C<EPIPE> errors in this callback.
		150
		151	AnyEvent::Handle tries to find an appropriate error code for you to check
		152	against, but in some cases (TLS errors), this does not work well. It is
		153	recommended to always output the C<$message> argument in human-readable
		154	error messages (it's usually the same as C<"$!">).
		155
		156	Non-fatal errors can be retried by simply returning, but it is recommended
		157	to simply ignore this parameter and instead abondon the handle object
		158	when this callback is invoked. Examples of non-fatal errors are timeouts
		159	C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>).
		160
		161	On callback entrance, the value of C<$!> contains the operating system
		162	error code (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT>, C<EBADMSG> or
		163	C<EPROTO>).
		164
		165	While not mandatory, it is I<highly> recommended to set this callback, as
		166	you will not be notified of errors otherwise. The default simply calls
		167	C<croak>.
		168
		169	=item on_read => $cb->($handle)
		170
		171	This sets the default read callback, which is called when data arrives
		172	and no read request is in the queue (unlike read queue callbacks, this
		173	callback will only be called when at least one octet of data is in the
		174	read buffer).
		175
		176	To access (and remove data from) the read buffer, use the C<< ->rbuf >>
		177	method or access the C<< $handle->{rbuf} >> member directly. Note that you
		178	must not enlarge or modify the read buffer, you can only remove data at
		179	the beginning from it.
		180
		181	When an EOF condition is detected then AnyEvent::Handle will first try to
		182	feed all the remaining data to the queued callbacks and C<on_read> before
		183	calling the C<on_eof> callback. If no progress can be made, then a fatal
		184	error will be raised (with C<$!> set to C<EPIPE>).
		185
		186	Note that, unlike requests in the read queue, an C<on_read> callback
		187	doesn't mean you I<require> some data: if there is an EOF and there
		188	are outstanding read requests then an error will be flagged. With an
		189	C<on_read> callback, the C<on_eof> callback will be invoked.
		190
82	=item on_eof => $cb->($handle)	191	=item on_eof => $cb->($handle)
83		192
84	Set the callback to be called when an end-of-file condition is detected,	193	Set the callback to be called when an end-of-file condition is detected,
85	i.e. in the case of a socket, when the other side has closed the	194	i.e. in the case of a socket, when the other side has closed the
86	connection cleanly.	195	connection cleanly, and there are no outstanding read requests in the
		196	queue (if there are read requests, then an EOF counts as an unexpected
		197	connection close and will be flagged as an error).
87		198
88	For sockets, this just means that the other side has stopped sending data,	199	For sockets, this just means that the other side has stopped sending data,
89	you can still try to write data, and, in fact, one can return from the EOF	200	you can still try to write data, and, in fact, one can return from the EOF
90	callback and continue writing data, as only the read part has been shut	201	callback and continue writing data, as only the read part has been shut
91	down.	202	down.
92		203
93	While not mandatory, it is I<highly> recommended to set an EOF callback,
94	otherwise you might end up with a closed socket while you are still
95	waiting for data.
96
97	If an EOF condition has been detected but no C<on_eof> callback has been	204	If an EOF condition has been detected but no C<on_eof> callback has been
98	set, then a fatal error will be raised with C<$!> set to <0>.	205	set, then a fatal error will be raised with C<$!> set to <0>.
99
100	=item on_error => $cb->($handle, $fatal)
101
102	This is the error callback, which is called when, well, some error
103	occured, such as not being able to resolve the hostname, failure to
104	connect or a read error.
105
106	Some errors are fatal (which is indicated by C<$fatal> being true). On
107	fatal errors the handle object will be shut down and will not be usable
108	(but you are free to look at the current C<< ->rbuf >>). Examples of fatal
109	errors are an EOF condition with active (but unsatisifable) read watchers
110	(C<EPIPE>) or I/O errors.
111
112	Non-fatal errors can be retried by simply returning, but it is recommended
113	to simply ignore this parameter and instead abondon the handle object
114	when this callback is invoked. Examples of non-fatal errors are timeouts
115	C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>).
116
117	On callback entrance, the value of C<$!> contains the operating system
118	error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>).
119
120	While not mandatory, it is I<highly> recommended to set this callback, as
121	you will not be notified of errors otherwise. The default simply calls
122	C<croak>.
123
124	=item on_read => $cb->($handle)
125
126	This sets the default read callback, which is called when data arrives
127	and no read request is in the queue (unlike read queue callbacks, this
128	callback will only be called when at least one octet of data is in the
129	read buffer).
130
131	To access (and remove data from) the read buffer, use the C<< ->rbuf >>
132	method or access the C<$handle->{rbuf}> member directly.
133
134	When an EOF condition is detected then AnyEvent::Handle will first try to
135	feed all the remaining data to the queued callbacks and C<on_read> before
136	calling the C<on_eof> callback. If no progress can be made, then a fatal
137	error will be raised (with C<$!> set to C<EPIPE>).
138		206
139	=item on_drain => $cb->($handle)	207	=item on_drain => $cb->($handle)
140		208
141	This sets the callback that is called when the write buffer becomes empty	209	This sets the callback that is called when the write buffer becomes empty
142	(or when the callback is set and the buffer is empty already).	210	(or when the callback is set and the buffer is empty already).
…		…
149	memory and push it into the queue, but instead only read more data from	217	memory and push it into the queue, but instead only read more data from
150	the file when the write queue becomes empty.	218	the file when the write queue becomes empty.
151		219
152	=item timeout => $fractional_seconds	220	=item timeout => $fractional_seconds
153		221
		222	=item rtimeout => $fractional_seconds
		223
		224	=item wtimeout => $fractional_seconds
		225
154	If non-zero, then this enables an "inactivity" timeout: whenever this many	226	If non-zero, then these enables an "inactivity" timeout: whenever this
155	seconds pass without a successful read or write on the underlying file	227	many seconds pass without a successful read or write on the underlying
156	handle, the C<on_timeout> callback will be invoked (and if that one is	228	file handle (or a call to C<timeout_reset>), the C<on_timeout> callback
157	missing, a non-fatal C<ETIMEDOUT> error will be raised).	229	will be invoked (and if that one is missing, a non-fatal C<ETIMEDOUT>
		230	error will be raised).
		231
		232	There are three variants of the timeouts that work fully independent
		233	of each other, for both read and write, just read, and just write:
		234	C<timeout>, C<rtimeout> and C<wtimeout>, with corresponding callbacks
		235	C<on_timeout>, C<on_rtimeout> and C<on_wtimeout>, and reset functions
		236	C<timeout_reset>, C<rtimeout_reset>, and C<wtimeout_reset>.
158		237
159	Note that timeout processing is also active when you currently do not have	238	Note that timeout processing is also active when you currently do not have
160	any outstanding read or write requests: If you plan to keep the connection	239	any outstanding read or write requests: If you plan to keep the connection
161	idle then you should disable the timout temporarily or ignore the timeout	240	idle then you should disable the timout temporarily or ignore the timeout
162	in the C<on_timeout> callback, in which case AnyEvent::Handle will simply	241	in the C<on_timeout> callback, in which case AnyEvent::Handle will simply
…		…
235		314
236	This will not work for partial TLS data that could not be encoded	315	This will not work for partial TLS data that could not be encoded
237	yet. This data will be lost. Calling the C<stoptls> method in time might	316	yet. This data will be lost. Calling the C<stoptls> method in time might
238	help.	317	help.
239		318
		319	=item peername => $string
		320
		321	A string used to identify the remote site - usually the DNS hostname
		322	(I<not> IDN!) used to create the connection, rarely the IP address.
		323
		324	Apart from being useful in error messages, this string is also used in TLS
		325	peername verification (see C<verify_peername> in L<AnyEvent::TLS>). This
		326	verification will be skipped when C<peername> is not specified or
		327	C<undef>.
		328
240	=item tls => "accept" | "connect" | Net::SSLeay::SSL object	329	=item tls => "accept" | "connect" | Net::SSLeay::SSL object
241		330
242	When this parameter is given, it enables TLS (SSL) mode, that means	331	When this parameter is given, it enables TLS (SSL) mode, that means
243	AnyEvent will start a TLS handshake as soon as the conenction has been	332	AnyEvent will start a TLS handshake as soon as the conenction has been
244	established and will transparently encrypt/decrypt data afterwards.	333	established and will transparently encrypt/decrypt data afterwards.
		334
		335	All TLS protocol errors will be signalled as C<EPROTO>, with an
		336	appropriate error message.
245		337
246	TLS mode requires Net::SSLeay to be installed (it will be loaded	338	TLS mode requires Net::SSLeay to be installed (it will be loaded
247	automatically when you try to create a TLS handle): this module doesn't	339	automatically when you try to create a TLS handle): this module doesn't
248	have a dependency on that module, so if your module requires it, you have	340	have a dependency on that module, so if your module requires it, you have
249	to add the dependency yourself.	341	to add the dependency yourself.
…		…
253	mode.	345	mode.
254		346
255	You can also provide your own TLS connection object, but you have	347	You can also provide your own TLS connection object, but you have
256	to make sure that you call either C<Net::SSLeay::set_connect_state>	348	to make sure that you call either C<Net::SSLeay::set_connect_state>
257	or C<Net::SSLeay::set_accept_state> on it before you pass it to	349	or C<Net::SSLeay::set_accept_state> on it before you pass it to
258	AnyEvent::Handle.	350	AnyEvent::Handle. Also, this module will take ownership of this connection
		351	object.
		352
		353	At some future point, AnyEvent::Handle might switch to another TLS
		354	implementation, then the option to use your own session object will go
		355	away.
259		356
260	B<IMPORTANT:> since Net::SSLeay "objects" are really only integers,	357	B<IMPORTANT:> since Net::SSLeay "objects" are really only integers,
261	passing in the wrong integer will lead to certain crash. This most often	358	passing in the wrong integer will lead to certain crash. This most often
262	happens when one uses a stylish C<< tls => 1 >> and is surprised about the	359	happens when one uses a stylish C<< tls => 1 >> and is surprised about the
263	segmentation fault.	360	segmentation fault.
264		361
265	See the C<< ->starttls >> method for when need to start TLS negotiation later.	362	See the C<< ->starttls >> method for when need to start TLS negotiation later.
266		363
267	=item tls_ctx => $ssl_ctx	364	=item tls_ctx => $anyevent_tls
268		365
269	Use the given C<Net::SSLeay::CTX> object to create the new TLS connection	366	Use the given C<AnyEvent::TLS> object to create the new TLS connection
270	(unless a connection object was specified directly). If this parameter is	367	(unless a connection object was specified directly). If this parameter is
271	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.	368	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.
		369
		370	Instead of an object, you can also specify a hash reference with C<< key
		371	=> value >> pairs. Those will be passed to L<AnyEvent::TLS> to create a
		372	new TLS context object.
		373
		374	=item on_starttls => $cb->($handle, $success[, $error_message])
		375
		376	This callback will be invoked when the TLS/SSL handshake has finished. If
		377	C<$success> is true, then the TLS handshake succeeded, otherwise it failed
		378	(C<on_stoptls> will not be called in this case).
		379
		380	The session in C<< $handle->{tls} >> can still be examined in this
		381	callback, even when the handshake was not successful.
		382
		383	TLS handshake failures will not cause C<on_error> to be invoked when this
		384	callback is in effect, instead, the error message will be passed to C<on_starttls>.
		385
		386	Without this callback, handshake failures lead to C<on_error> being
		387	called, as normal.
		388
		389	Note that you cannot call C<starttls> right again in this callback. If you
		390	need to do that, start an zero-second timer instead whose callback can
		391	then call C<< ->starttls >> again.
		392
		393	=item on_stoptls => $cb->($handle)
		394
		395	When a SSLv3/TLS shutdown/close notify/EOF is detected and this callback is
		396	set, then it will be invoked after freeing the TLS session. If it is not,
		397	then a TLS shutdown condition will be treated like a normal EOF condition
		398	on the handle.
		399
		400	The session in C<< $handle->{tls} >> can still be examined in this
		401	callback.
		402
		403	This callback will only be called on TLS shutdowns, not when the
		404	underlying handle signals EOF.
272		405
273	=item json => JSON or JSON::XS object	406	=item json => JSON or JSON::XS object
274		407
275	This is the json coder object used by the C<json> read and write types.	408	This is the json coder object used by the C<json> read and write types.
276		409
…		…
285		418
286	=cut	419	=cut
287		420
288	sub new {	421	sub new {
289	my $class = shift;	422	my $class = shift;
290
291	my $self = bless { @_ }, $class;	423	my $self = bless { @_ }, $class;
292		424
293	$self->{fh} or Carp::croak "mandatory argument fh is missing";	425	if ($self->{fh}) {
		426	$self->_start;
		427	return unless $self->{fh}; # could be gone by now
		428
		429	} elsif ($self->{connect}) {
		430	require AnyEvent::Socket;
		431
		432	$self->{peername} = $self->{connect}[0]
		433	unless exists $self->{peername};
		434
		435	$self->{_skip_drain_rbuf} = 1;
		436
		437	{
		438	Scalar::Util::weaken (my $self = $self);
		439
		440	$self->{_connect} =
		441	AnyEvent::Socket::tcp_connect (
		442	$self->{connect}[0],
		443	$self->{connect}[1],
		444	sub {
		445	my ($fh, $host, $port, $retry) = @_;
		446
		447	if ($fh) {
		448	$self->{fh} = $fh;
		449
		450	delete $self->{_skip_drain_rbuf};
		451	$self->_start;
		452
		453	$self->{on_connect}
		454	and $self->{on_connect}($self, $host, $port, sub {
		455	delete @$self{qw(fh _tw _rtw _wtw _ww _rw _eof _queue rbuf _wbuf tls _tls_rbuf _tls_wbuf)};
		456	$self->{_skip_drain_rbuf} = 1;
		457	&$retry;
		458	});
		459
		460	} else {
		461	if ($self->{on_connect_error}) {
		462	$self->{on_connect_error}($self, "$!");
		463	$self->destroy;
		464	} else {
		465	$self->_error ($!, 1);
		466	}
		467	}
		468	},
		469	sub {
		470	local $self->{fh} = $_[0];
		471
		472	$self->{on_prepare}
		473	? $self->{on_prepare}->($self)
		474	: ()
		475	}
		476	);
		477	}
		478
		479	} else {
		480	Carp::croak "AnyEvent::Handle: either an existing fh or the connect parameter must be specified";
		481	}
		482
		483	$self
		484	}
		485
		486	sub _start {
		487	my ($self) = @_;
294		488
295	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;	489	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;
		490
		491	$self->{_activity} =
		492	$self->{_ractivity} =
		493	$self->{_wactivity} = AE::now;
		494
		495	$self->timeout (delete $self->{timeout} ) if $self->{timeout};
		496	$self->rtimeout (delete $self->{rtimeout}) if $self->{rtimeout};
		497	$self->wtimeout (delete $self->{wtimeout}) if $self->{wtimeout};
		498
		499	$self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay};
296		500
297	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx})	501	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx})
298	if $self->{tls};	502	if $self->{tls};
299		503
300	$self->{_activity} = AnyEvent->now;
301	$self->_timeout;
302
303	$self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain};	504	$self->on_drain (delete $self->{on_drain}) if $self->{on_drain};
304	$self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay};
305		505
306	$self->start_read	506	$self->start_read
307	if $self->{on_read};	507	if $self->{on_read} || @{ $self->{_queue} };
308		508
309	$self	509	$self->_drain_wbuf;
310	}
311
312	sub _shutdown {
313	my ($self) = @_;
314
315	delete $self->{_tw};
316	delete $self->{_rw};
317	delete $self->{_ww};
318	delete $self->{fh};
319
320	&_freetls;
321
322	delete $self->{on_read};
323	delete $self->{_queue};
324	}	510	}
325		511
326	sub _error {	512	sub _error {
327	my ($self, $errno, $fatal) = @_;	513	my ($self, $errno, $fatal, $message) = @_;
328
329	$self->_shutdown
330	if $fatal;
331		514
332	$! = $errno;	515	$! = $errno;
		516	$message ||= "$!";
333		517
334	if ($self->{on_error}) {	518	if ($self->{on_error}) {
335	$self->{on_error}($self, $fatal);	519	$self->{on_error}($self, $fatal, $message);
		520	$self->destroy if $fatal;
336	} elsif ($self->{fh}) {	521	} elsif ($self->{fh}) {
		522	$self->destroy;
337	Carp::croak "AnyEvent::Handle uncaught error: $!";	523	Carp::croak "AnyEvent::Handle uncaught error: $message";
338	}	524	}
339	}	525	}
340		526
341	=item $fh = $handle->fh	527	=item $fh = $handle->fh
342		528
…		…
366	$_[0]{on_eof} = $_[1];	552	$_[0]{on_eof} = $_[1];
367	}	553	}
368		554
369	=item $handle->on_timeout ($cb)	555	=item $handle->on_timeout ($cb)
370		556
371	Replace the current C<on_timeout> callback, or disables the callback (but	557	=item $handle->on_rtimeout ($cb)
372	not the timeout) if C<$cb> = C<undef>. See the C<timeout> constructor
373	argument and method.
374		558
375	=cut	559	=item $handle->on_wtimeout ($cb)
376		560
377	sub on_timeout {	561	Replace the current C<on_timeout>, C<on_rtimeout> or C<on_wtimeout>
378	$_[0]{on_timeout} = $_[1];	562	callback, or disables the callback (but not the timeout) if C<$cb> =
379	}	563	C<undef>. See the C<timeout> constructor argument and method.
		564
		565	=cut
		566
		567	# see below
380		568
381	=item $handle->autocork ($boolean)	569	=item $handle->autocork ($boolean)
382		570
383	Enables or disables the current autocork behaviour (see C<autocork>	571	Enables or disables the current autocork behaviour (see C<autocork>
384	constructor argument). Changes will only take effect on the next write.	572	constructor argument). Changes will only take effect on the next write.
…		…
399	sub no_delay {	587	sub no_delay {
400	$_[0]{no_delay} = $_[1];	588	$_[0]{no_delay} = $_[1];
401		589
402	eval {	590	eval {
403	local $SIG{__DIE__};	591	local $SIG{__DIE__};
404	setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1];	592	setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1]
		593	if $_[0]{fh};
405	};	594	};
406	}	595	}
407		596
		597	=item $handle->on_starttls ($cb)
		598
		599	Replace the current C<on_starttls> callback (see the C<on_starttls> constructor argument).
		600
		601	=cut
		602
		603	sub on_starttls {
		604	$_[0]{on_starttls} = $_[1];
		605	}
		606
		607	=item $handle->on_stoptls ($cb)
		608
		609	Replace the current C<on_stoptls> callback (see the C<on_stoptls> constructor argument).
		610
		611	=cut
		612
		613	sub on_starttls {
		614	$_[0]{on_stoptls} = $_[1];
		615	}
		616
		617	=item $handle->rbuf_max ($max_octets)
		618
		619	Configures the C<rbuf_max> setting (C<undef> disables it).
		620
		621	=cut
		622
		623	sub rbuf_max {
		624	$_[0]{rbuf_max} = $_[1];
		625	}
		626
408	#############################################################################	627	#############################################################################
409		628
410	=item $handle->timeout ($seconds)	629	=item $handle->timeout ($seconds)
411		630
		631	=item $handle->rtimeout ($seconds)
		632
		633	=item $handle->wtimeout ($seconds)
		634
412	Configures (or disables) the inactivity timeout.	635	Configures (or disables) the inactivity timeout.
413		636
414	=cut	637	=item $handle->timeout_reset
415		638
416	sub timeout {	639	=item $handle->rtimeout_reset
		640
		641	=item $handle->wtimeout_reset
		642
		643	Reset the activity timeout, as if data was received or sent.
		644
		645	These methods are cheap to call.
		646
		647	=cut
		648
		649	for my $dir ("", "r", "w") {
		650	my $timeout = "${dir}timeout";
		651	my $tw = "_${dir}tw";
		652	my $on_timeout = "on_${dir}timeout";
		653	my $activity = "_${dir}activity";
		654	my $cb;
		655
		656	*$on_timeout = sub {
		657	$_[0]{$on_timeout} = $_[1];
		658	};
		659
		660	*$timeout = sub {
417	my ($self, $timeout) = @_;	661	my ($self, $new_value) = @_;
418		662
419	$self->{timeout} = $timeout;	663	$self->{$timeout} = $new_value;
420	$self->_timeout;	664	delete $self->{$tw}; &$cb;
421	}	665	};
422		666
		667	*{"${dir}timeout_reset"} = sub {
		668	$_[0]{$activity} = AE::now;
		669	};
		670
		671	# main workhorse:
423	# reset the timeout watcher, as neccessary	672	# reset the timeout watcher, as neccessary
424	# also check for time-outs	673	# also check for time-outs
425	sub _timeout {	674	$cb = sub {
426	my ($self) = @_;	675	my ($self) = @_;
427		676
428	if ($self->{timeout}) {	677	if ($self->{$timeout} && $self->{fh}) {
429	my $NOW = AnyEvent->now;	678	my $NOW = AE::now;
430		679
431	# when would the timeout trigger?	680	# when would the timeout trigger?
432	my $after = $self->{_activity} + $self->{timeout} - $NOW;	681	my $after = $self->{$activity} + $self->{$timeout} - $NOW;
433		682
434	# now or in the past already?	683	# now or in the past already?
435	if ($after <= 0) {	684	if ($after <= 0) {
436	$self->{_activity} = $NOW;	685	$self->{$activity} = $NOW;
437		686
438	if ($self->{on_timeout}) {	687	if ($self->{$on_timeout}) {
439	$self->{on_timeout}($self);	688	$self->{$on_timeout}($self);
440	} else {	689	} else {
441	$self->_error (&Errno::ETIMEDOUT);	690	$self->_error (Errno::ETIMEDOUT);
		691	}
		692
		693	# callback could have changed timeout value, optimise
		694	return unless $self->{$timeout};
		695
		696	# calculate new after
		697	$after = $self->{$timeout};
442	}	698	}
443		699
444	# callback could have changed timeout value, optimise	700	Scalar::Util::weaken $self;
445	return unless $self->{timeout};	701	return unless $self; # ->error could have destroyed $self
446		702
447	# calculate new after	703	$self->{$tw} ||= AE::timer $after, 0, sub {
448	$after = $self->{timeout};	704	delete $self->{$tw};
		705	$cb->($self);
		706	};
		707	} else {
		708	delete $self->{$tw};
449	}	709	}
450
451	Scalar::Util::weaken $self;
452	return unless $self; # ->error could have destroyed $self
453
454	$self->{_tw} ||= AnyEvent->timer (after => $after, cb => sub {
455	delete $self->{_tw};
456	$self->_timeout;
457	});
458	} else {
459	delete $self->{_tw};
460	}	710	}
461	}	711	}
462		712
463	#############################################################################	713	#############################################################################
464		714
…		…
509	Scalar::Util::weaken $self;	759	Scalar::Util::weaken $self;
510		760
511	my $cb = sub {	761	my $cb = sub {
512	my $len = syswrite $self->{fh}, $self->{wbuf};	762	my $len = syswrite $self->{fh}, $self->{wbuf};
513		763
514	if ($len >= 0) {	764	if (defined $len) {
515	substr $self->{wbuf}, 0, $len, "";	765	substr $self->{wbuf}, 0, $len, "";
516		766
517	$self->{_activity} = AnyEvent->now;	767	$self->{_activity} = $self->{_wactivity} = AE::now;
518		768
519	$self->{on_drain}($self)	769	$self->{on_drain}($self)
520	if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf})	770	if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf})
521	&& $self->{on_drain};	771	&& $self->{on_drain};
522		772
…		…
528		778
529	# try to write data immediately	779	# try to write data immediately
530	$cb->() unless $self->{autocork};	780	$cb->() unless $self->{autocork};
531		781
532	# if still data left in wbuf, we need to poll	782	# if still data left in wbuf, we need to poll
533	$self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb)	783	$self->{_ww} = AE::io $self->{fh}, 1, $cb
534	if length $self->{wbuf};	784	if length $self->{wbuf};
535	};	785	};
536	}	786	}
537		787
538	our %WH;	788	our %WH;
…		…
551	->($self, @_);	801	->($self, @_);
552	}	802	}
553		803
554	if ($self->{tls}) {	804	if ($self->{tls}) {
555	$self->{_tls_wbuf} .= $_[0];	805	$self->{_tls_wbuf} .= $_[0];
556		806	&_dotls ($self) if $self->{fh};
557	&_dotls ($self);
558	} else {	807	} else {
559	$self->{wbuf} .= $_[0];	808	$self->{wbuf} .= $_[0];
560	$self->_drain_wbuf;	809	$self->_drain_wbuf if $self->{fh};
561	}	810	}
562	}	811	}
563		812
564	=item $handle->push_write (type => @args)	813	=item $handle->push_write (type => @args)
565		814
…		…
629	Other languages could read single lines terminated by a newline and pass	878	Other languages could read single lines terminated by a newline and pass
630	this line into their JSON decoder of choice.	879	this line into their JSON decoder of choice.
631		880
632	=cut	881	=cut
633		882
		883	sub json_coder() {
		884	eval { require JSON::XS; JSON::XS->new->utf8 }
		885	|| do { require JSON; JSON->new->utf8 }
		886	}
		887
634	register_write_type json => sub {	888	register_write_type json => sub {
635	my ($self, $ref) = @_;	889	my ($self, $ref) = @_;
636		890
637	require JSON;	891	my $json = $self->{json} ||= json_coder;
638		892
639	$self->{json} ? $self->{json}->encode ($ref)	893	$json->encode ($ref)
640	: JSON::encode_json ($ref)
641	};	894	};
642		895
643	=item storable => $reference	896	=item storable => $reference
644		897
645	Freezes the given reference using L<Storable> and writes it to the	898	Freezes the given reference using L<Storable> and writes it to the
…		…
654		907
655	pack "w/a*", Storable::nfreeze ($ref)	908	pack "w/a*", Storable::nfreeze ($ref)
656	};	909	};
657		910
658	=back	911	=back
		912
		913	=item $handle->push_shutdown
		914
		915	Sometimes you know you want to close the socket after writing your data
		916	before it was actually written. One way to do that is to replace your
		917	C<on_drain> handler by a callback that shuts down the socket (and set
		918	C<low_water_mark> to C<0>). This method is a shorthand for just that, and
		919	replaces the C<on_drain> callback with:
		920
		921	sub { shutdown $_[0]{fh}, 1 } # for push_shutdown
		922
		923	This simply shuts down the write side and signals an EOF condition to the
		924	the peer.
		925
		926	You can rely on the normal read queue and C<on_eof> handling
		927	afterwards. This is the cleanest way to close a connection.
		928
		929	=cut
		930
		931	sub push_shutdown {
		932	my ($self) = @_;
		933
		934	delete $self->{low_water_mark};
		935	$self->on_drain (sub { shutdown $_[0]{fh}, 1 });
		936	}
659		937
660	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)	938	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)
661		939
662	This function (not method) lets you add your own types to C<push_write>.	940	This function (not method) lets you add your own types to C<push_write>.
663	Whenever the given C<type> is used, C<push_write> will invoke the code	941	Whenever the given C<type> is used, C<push_write> will invoke the code
…		…
757	=cut	1035	=cut
758		1036
759	sub _drain_rbuf {	1037	sub _drain_rbuf {
760	my ($self) = @_;	1038	my ($self) = @_;
761		1039
		1040	# avoid recursion
		1041	return if $self->{_skip_drain_rbuf};
762	local $self->{_in_drain} = 1;	1042	local $self->{_skip_drain_rbuf} = 1;
763
764	if (
765	defined $self->{rbuf_max}
766	&& $self->{rbuf_max} < length $self->{rbuf}
767	) {
768	$self->_error (&Errno::ENOSPC, 1), return;
769	}
770		1043
771	while () {	1044	while () {
		1045	# we need to use a separate tls read buffer, as we must not receive data while
		1046	# we are draining the buffer, and this can only happen with TLS.
		1047	$self->{rbuf} .= delete $self->{_tls_rbuf}
		1048	if exists $self->{_tls_rbuf};
		1049
772	my $len = length $self->{rbuf};	1050	my $len = length $self->{rbuf};
773		1051
774	if (my $cb = shift @{ $self->{_queue} }) {	1052	if (my $cb = shift @{ $self->{_queue} }) {
775	unless ($cb->($self)) {	1053	unless ($cb->($self)) {
776	if ($self->{_eof}) {	1054	# no progress can be made
777	# no progress can be made (not enough data and no data forthcoming)	1055	# (not enough data and no data forthcoming)
778	$self->_error (&Errno::EPIPE, 1), return;	1056	$self->_error (Errno::EPIPE, 1), return
779	}	1057	if $self->{_eof};
780		1058
781	unshift @{ $self->{_queue} }, $cb;	1059	unshift @{ $self->{_queue} }, $cb;
782	last;	1060	last;
783	}	1061	}
784	} elsif ($self->{on_read}) {	1062	} elsif ($self->{on_read}) {
…		…
791	&& !@{ $self->{_queue} } # and the queue is still empty	1069	&& !@{ $self->{_queue} } # and the queue is still empty
792	&& $self->{on_read} # but we still have on_read	1070	&& $self->{on_read} # but we still have on_read
793	) {	1071	) {
794	# no further data will arrive	1072	# no further data will arrive
795	# so no progress can be made	1073	# so no progress can be made
796	$self->_error (&Errno::EPIPE, 1), return	1074	$self->_error (Errno::EPIPE, 1), return
797	if $self->{_eof};	1075	if $self->{_eof};
798		1076
799	last; # more data might arrive	1077	last; # more data might arrive
800	}	1078	}
801	} else {	1079	} else {
…		…
804	last;	1082	last;
805	}	1083	}
806	}	1084	}
807		1085
808	if ($self->{_eof}) {	1086	if ($self->{_eof}) {
809	if ($self->{on_eof}) {	1087	$self->{on_eof}
810	$self->{on_eof}($self)	1088	? $self->{on_eof}($self)
811	} else {	1089	: $self->_error (0, 1, "Unexpected end-of-file");
812	$self->_error (0, 1);	1090
813	}	1091	return;
		1092	}
		1093
		1094	if (
		1095	defined $self->{rbuf_max}
		1096	&& $self->{rbuf_max} < length $self->{rbuf}
		1097	) {
		1098	$self->_error (Errno::ENOSPC, 1), return;
814	}	1099	}
815		1100
816	# may need to restart read watcher	1101	# may need to restart read watcher
817	unless ($self->{_rw}) {	1102	unless ($self->{_rw}) {
818	$self->start_read	1103	$self->start_read
…		…
830		1115
831	sub on_read {	1116	sub on_read {
832	my ($self, $cb) = @_;	1117	my ($self, $cb) = @_;
833		1118
834	$self->{on_read} = $cb;	1119	$self->{on_read} = $cb;
835	$self->_drain_rbuf if $cb && !$self->{_in_drain};	1120	$self->_drain_rbuf if $cb;
836	}	1121	}
837		1122
838	=item $handle->rbuf	1123	=item $handle->rbuf
839		1124
840	Returns the read buffer (as a modifiable lvalue).	1125	Returns the read buffer (as a modifiable lvalue).
841		1126
842	You can access the read buffer directly as the C<< ->{rbuf} >> member, if	1127	You can access the read buffer directly as the C<< ->{rbuf} >>
843	you want.	1128	member, if you want. However, the only operation allowed on the
		1129	read buffer (apart from looking at it) is removing data from its
		1130	beginning. Otherwise modifying or appending to it is not allowed and will
		1131	lead to hard-to-track-down bugs.
844		1132
845	NOTE: The read buffer should only be used or modified if the C<on_read>,	1133	NOTE: The read buffer should only be used or modified if the C<on_read>,
846	C<push_read> or C<unshift_read> methods are used. The other read methods	1134	C<push_read> or C<unshift_read> methods are used. The other read methods
847	automatically manage the read buffer.	1135	automatically manage the read buffer.
848		1136
…		…
889	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read")	1177	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read")
890	->($self, $cb, @_);	1178	->($self, $cb, @_);
891	}	1179	}
892		1180
893	push @{ $self->{_queue} }, $cb;	1181	push @{ $self->{_queue} }, $cb;
894	$self->_drain_rbuf unless $self->{_in_drain};	1182	$self->_drain_rbuf;
895	}	1183	}
896		1184
897	sub unshift_read {	1185	sub unshift_read {
898	my $self = shift;	1186	my $self = shift;
899	my $cb = pop;	1187	my $cb = pop;
…		…
905	->($self, $cb, @_);	1193	->($self, $cb, @_);
906	}	1194	}
907		1195
908		1196
909	unshift @{ $self->{_queue} }, $cb;	1197	unshift @{ $self->{_queue} }, $cb;
910	$self->_drain_rbuf unless $self->{_in_drain};	1198	$self->_drain_rbuf;
911	}	1199	}
912		1200
913	=item $handle->push_read (type => @args, $cb)	1201	=item $handle->push_read (type => @args, $cb)
914		1202
915	=item $handle->unshift_read (type => @args, $cb)	1203	=item $handle->unshift_read (type => @args, $cb)
…		…
1048	return 1;	1336	return 1;
1049	}	1337	}
1050		1338
1051	# reject	1339	# reject
1052	if ($reject && $$rbuf =~ $reject) {	1340	if ($reject && $$rbuf =~ $reject) {
1053	$self->_error (&Errno::EBADMSG);	1341	$self->_error (Errno::EBADMSG);
1054	}	1342	}
1055		1343
1056	# skip	1344	# skip
1057	if ($skip && $$rbuf =~ $skip) {	1345	if ($skip && $$rbuf =~ $skip) {
1058	$data .= substr $$rbuf, 0, $+[0], "";	1346	$data .= substr $$rbuf, 0, $+[0], "";
…		…
1074	my ($self, $cb) = @_;	1362	my ($self, $cb) = @_;
1075		1363
1076	sub {	1364	sub {
1077	unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) {	1365	unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) {
1078	if ($_[0]{rbuf} =~ /[^0-9]/) {	1366	if ($_[0]{rbuf} =~ /[^0-9]/) {
1079	$self->_error (&Errno::EBADMSG);	1367	$self->_error (Errno::EBADMSG);
1080	}	1368	}
1081	return;	1369	return;
1082	}	1370	}
1083		1371
1084	my $len = $1;	1372	my $len = $1;
…		…
1087	my $string = $_[1];	1375	my $string = $_[1];
1088	$_[0]->unshift_read (chunk => 1, sub {	1376	$_[0]->unshift_read (chunk => 1, sub {
1089	if ($_[1] eq ",") {	1377	if ($_[1] eq ",") {
1090	$cb->($_[0], $string);	1378	$cb->($_[0], $string);
1091	} else {	1379	} else {
1092	$self->_error (&Errno::EBADMSG);	1380	$self->_error (Errno::EBADMSG);
1093	}	1381	}
1094	});	1382	});
1095	});	1383	});
1096		1384
1097	1	1385	1
…		…
1164	=cut	1452	=cut
1165		1453
1166	register_read_type json => sub {	1454	register_read_type json => sub {
1167	my ($self, $cb) = @_;	1455	my ($self, $cb) = @_;
1168		1456
1169	require JSON;	1457	my $json = $self->{json} ||= json_coder;
1170		1458
1171	my $data;	1459	my $data;
1172	my $rbuf = \$self->{rbuf};	1460	my $rbuf = \$self->{rbuf};
1173
1174	my $json = $self->{json} ||= JSON->new->utf8;
1175		1461
1176	sub {	1462	sub {
1177	my $ref = eval { $json->incr_parse ($self->{rbuf}) };	1463	my $ref = eval { $json->incr_parse ($self->{rbuf}) };
1178		1464
1179	if ($ref) {	1465	if ($ref) {
…		…
1187	$json->incr_skip;	1473	$json->incr_skip;
1188		1474
1189	$self->{rbuf} = $json->incr_text;	1475	$self->{rbuf} = $json->incr_text;
1190	$json->incr_text = "";	1476	$json->incr_text = "";
1191		1477
1192	$self->_error (&Errno::EBADMSG);	1478	$self->_error (Errno::EBADMSG);
		1479
1193	()	1480	()
1194
1195	} else {	1481	} else {
1196	$self->{rbuf} = "";	1482	$self->{rbuf} = "";
		1483
1197	()	1484	()
1198	}	1485	}
1199	}	1486	}
1200	};	1487	};
1201		1488
…		…
1233	# read remaining chunk	1520	# read remaining chunk
1234	$_[0]->unshift_read (chunk => $len, sub {	1521	$_[0]->unshift_read (chunk => $len, sub {
1235	if (my $ref = eval { Storable::thaw ($_[1]) }) {	1522	if (my $ref = eval { Storable::thaw ($_[1]) }) {
1236	$cb->($_[0], $ref);	1523	$cb->($_[0], $ref);
1237	} else {	1524	} else {
1238	$self->_error (&Errno::EBADMSG);	1525	$self->_error (Errno::EBADMSG);
1239	}	1526	}
1240	});	1527	});
1241	}	1528	}
1242		1529
1243	1	1530	1
…		…
1295	my ($self) = @_;	1582	my ($self) = @_;
1296		1583
1297	unless ($self->{_rw} || $self->{_eof}) {	1584	unless ($self->{_rw} || $self->{_eof}) {
1298	Scalar::Util::weaken $self;	1585	Scalar::Util::weaken $self;
1299		1586
1300	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {	1587	$self->{_rw} = AE::io $self->{fh}, 0, sub {
1301	my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});	1588	my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});
1302	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf;	1589	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf;
1303		1590
1304	if ($len > 0) {	1591	if ($len > 0) {
1305	$self->{_activity} = AnyEvent->now;	1592	$self->{_activity} = $self->{_ractivity} = AE::now;
1306		1593
1307	if ($self->{tls}) {	1594	if ($self->{tls}) {
1308	Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);	1595	Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);
1309		1596
1310	&_dotls ($self);	1597	&_dotls ($self);
1311	} else {	1598	} else {
1312	$self->_drain_rbuf unless $self->{_in_drain};	1599	$self->_drain_rbuf;
1313	}	1600	}
1314		1601
1315	} elsif (defined $len) {	1602	} elsif (defined $len) {
1316	delete $self->{_rw};	1603	delete $self->{_rw};
1317	$self->{_eof} = 1;	1604	$self->{_eof} = 1;
1318	$self->_drain_rbuf unless $self->{_in_drain};	1605	$self->_drain_rbuf;
1319		1606
1320	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	1607	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
1321	return $self->_error ($!, 1);	1608	return $self->_error ($!, 1);
1322	}	1609	}
1323	});	1610	};
		1611	}
		1612	}
		1613
		1614	our $ERROR_SYSCALL;
		1615	our $ERROR_WANT_READ;
		1616
		1617	sub _tls_error {
		1618	my ($self, $err) = @_;
		1619
		1620	return $self->_error ($!, 1)
		1621	if $err == Net::SSLeay::ERROR_SYSCALL ();
		1622
		1623	my $err =Net::SSLeay::ERR_error_string (Net::SSLeay::ERR_get_error ());
		1624
		1625	# reduce error string to look less scary
		1626	$err =~ s/^error:[0-9a-fA-F]{8}:[^:]+:([^:]+):/\L$1: /;
		1627
		1628	if ($self->{_on_starttls}) {
		1629	(delete $self->{_on_starttls})->($self, undef, $err);
		1630	&_freetls;
		1631	} else {
		1632	&_freetls;
		1633	$self->_error (Errno::EPROTO, 1, $err);
1324	}	1634	}
1325	}	1635	}
1326		1636
1327	# poll the write BIO and send the data if applicable	1637	# poll the write BIO and send the data if applicable
		1638	# also decode read data if possible
		1639	# this is basiclaly our TLS state machine
		1640	# more efficient implementations are possible with openssl,
		1641	# but not with the buggy and incomplete Net::SSLeay.
1328	sub _dotls {	1642	sub _dotls {
1329	my ($self) = @_;	1643	my ($self) = @_;
1330		1644
1331	my $tmp;	1645	my $tmp;
1332		1646
1333	if (length $self->{_tls_wbuf}) {	1647	if (length $self->{_tls_wbuf}) {
1334	while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {	1648	while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {
1335	substr $self->{_tls_wbuf}, 0, $tmp, "";	1649	substr $self->{_tls_wbuf}, 0, $tmp, "";
1336	}	1650	}
		1651
		1652	$tmp = Net::SSLeay::get_error ($self->{tls}, $tmp);
		1653	return $self->_tls_error ($tmp)
		1654	if $tmp != $ERROR_WANT_READ
		1655	&& ($tmp != $ERROR_SYSCALL || $!);
1337	}	1656	}
1338		1657
1339	while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) {	1658	while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) {
1340	unless (length $tmp) {	1659	unless (length $tmp) {
1341	# let's treat SSL-eof as we treat normal EOF	1660	$self->{_on_starttls}
1342	delete $self->{_rw};	1661	and (delete $self->{_on_starttls})->($self, undef, "EOF during handshake"); # ???
1343	$self->{_eof} = 1;
1344	&_freetls;	1662	&_freetls;
		1663
		1664	if ($self->{on_stoptls}) {
		1665	$self->{on_stoptls}($self);
		1666	return;
		1667	} else {
		1668	# let's treat SSL-eof as we treat normal EOF
		1669	delete $self->{_rw};
		1670	$self->{_eof} = 1;
		1671	}
1345	}	1672	}
1346		1673
1347	$self->{rbuf} .= $tmp;	1674	$self->{_tls_rbuf} .= $tmp;
1348	$self->_drain_rbuf unless $self->{_in_drain};	1675	$self->_drain_rbuf;
1349	$self->{tls} or return; # tls session might have gone away in callback	1676	$self->{tls} or return; # tls session might have gone away in callback
1350	}	1677	}
1351		1678
1352	$tmp = Net::SSLeay::get_error ($self->{tls}, -1);	1679	$tmp = Net::SSLeay::get_error ($self->{tls}, -1);
1353
1354	if ($tmp != Net::SSLeay::ERROR_WANT_READ ()) {
1355	if ($tmp == Net::SSLeay::ERROR_SYSCALL ()) {
1356	return $self->_error ($!, 1);	1680	return $self->_tls_error ($tmp)
1357	} elsif ($tmp == Net::SSLeay::ERROR_SSL ()) {	1681	if $tmp != $ERROR_WANT_READ
1358	return $self->_error (&Errno::EIO, 1);	1682	&& ($tmp != $ERROR_SYSCALL || $!);
1359	}
1360
1361	# all other errors are fine for our purposes
1362	}
1363		1683
1364	while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) {	1684	while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) {
1365	$self->{wbuf} .= $tmp;	1685	$self->{wbuf} .= $tmp;
1366	$self->_drain_wbuf;	1686	$self->_drain_wbuf;
1367	}	1687	}
		1688
		1689	$self->{_on_starttls}
		1690	and Net::SSLeay::state ($self->{tls}) == Net::SSLeay::ST_OK ()
		1691	and (delete $self->{_on_starttls})->($self, 1, "TLS/SSL connection established");
1368	}	1692	}
1369		1693
1370	=item $handle->starttls ($tls[, $tls_ctx])	1694	=item $handle->starttls ($tls[, $tls_ctx])
1371		1695
1372	Instead of starting TLS negotiation immediately when the AnyEvent::Handle	1696	Instead of starting TLS negotiation immediately when the AnyEvent::Handle
1373	object is created, you can also do that at a later time by calling	1697	object is created, you can also do that at a later time by calling
1374	C<starttls>.	1698	C<starttls>.
1375		1699
		1700	Starting TLS is currently an asynchronous operation - when you push some
		1701	write data and then call C<< ->starttls >> then TLS negotiation will start
		1702	immediately, after which the queued write data is then sent.
		1703
1376	The first argument is the same as the C<tls> constructor argument (either	1704	The first argument is the same as the C<tls> constructor argument (either
1377	C<"connect">, C<"accept"> or an existing Net::SSLeay object).	1705	C<"connect">, C<"accept"> or an existing Net::SSLeay object).
1378		1706
1379	The second argument is the optional C<Net::SSLeay::CTX> object that is	1707	The second argument is the optional C<AnyEvent::TLS> object that is used
1380	used when AnyEvent::Handle has to create its own TLS connection object.	1708	when AnyEvent::Handle has to create its own TLS connection object, or
		1709	a hash reference with C<< key => value >> pairs that will be used to
		1710	construct a new context.
1381		1711
1382	The TLS connection object will end up in C<< $handle->{tls} >> after this	1712	The TLS connection object will end up in C<< $handle->{tls} >>, the TLS
1383	call and can be used or changed to your liking. Note that the handshake	1713	context in C<< $handle->{tls_ctx} >> after this call and can be used or
1384	might have already started when this function returns.	1714	changed to your liking. Note that the handshake might have already started
		1715	when this function returns.
1385		1716
1386	If it an error to start a TLS handshake more than once per	1717	Due to bugs in OpenSSL, it might or might not be possible to do multiple
1387	AnyEvent::Handle object (this is due to bugs in OpenSSL).	1718	handshakes on the same stream. Best do not attempt to use the stream after
		1719	stopping TLS.
1388		1720
1389	=cut	1721	=cut
		1722
		1723	our %TLS_CACHE; #TODO not yet documented, should we?
1390		1724
1391	sub starttls {	1725	sub starttls {
1392	my ($self, $ssl, $ctx) = @_;	1726	my ($self, $tls, $ctx) = @_;
		1727
		1728	Carp::croak "It is an error to call starttls on an AnyEvent::Handle object while TLS is already active, caught"
		1729	if $self->{tls};
		1730
		1731	$self->{tls} = $tls;
		1732	$self->{tls_ctx} = $ctx if @_ > 2;
		1733
		1734	return unless $self->{fh};
1393		1735
1394	require Net::SSLeay;	1736	require Net::SSLeay;
1395		1737
1396	Carp::croak "it is an error to call starttls more than once on an AnyEvent::Handle object"	1738	$ERROR_SYSCALL = Net::SSLeay::ERROR_SYSCALL ();
1397	if $self->{tls};	1739	$ERROR_WANT_READ = Net::SSLeay::ERROR_WANT_READ ();
		1740
		1741	$tls = delete $self->{tls};
		1742	$ctx = $self->{tls_ctx};
		1743
		1744	local $Carp::CarpLevel = 1; # skip ourselves when creating a new context or session
		1745
		1746	if ("HASH" eq ref $ctx) {
		1747	require AnyEvent::TLS;
		1748
		1749	if ($ctx->{cache}) {
		1750	my $key = $ctx+0;
		1751	$ctx = $TLS_CACHE{$key} ||= new AnyEvent::TLS %$ctx;
		1752	} else {
		1753	$ctx = new AnyEvent::TLS %$ctx;
		1754	}
		1755	}
1398		1756
1399	if ($ssl eq "accept") {	1757	$self->{tls_ctx} = $ctx || TLS_CTX ();
1400	$ssl = Net::SSLeay::new ($ctx || TLS_CTX ());	1758	$self->{tls} = $tls = $self->{tls_ctx}->_get_session ($tls, $self, $self->{peername});
1401	Net::SSLeay::set_accept_state ($ssl);
1402	} elsif ($ssl eq "connect") {
1403	$ssl = Net::SSLeay::new ($ctx || TLS_CTX ());
1404	Net::SSLeay::set_connect_state ($ssl);
1405	}
1406
1407	$self->{tls} = $ssl;
1408		1759
1409	# basically, this is deep magic (because SSL_read should have the same issues)	1760	# basically, this is deep magic (because SSL_read should have the same issues)
1410	# but the openssl maintainers basically said: "trust us, it just works".	1761	# but the openssl maintainers basically said: "trust us, it just works".
1411	# (unfortunately, we have to hardcode constants because the abysmally misdesigned	1762	# (unfortunately, we have to hardcode constants because the abysmally misdesigned
1412	# and mismaintained ssleay-module doesn't even offer them).	1763	# and mismaintained ssleay-module doesn't even offer them).
…		…
1416	#	1767	#
1417	# note that we do not try to keep the length constant between writes as we are required to do.	1768	# note that we do not try to keep the length constant between writes as we are required to do.
1418	# we assume that most (but not all) of this insanity only applies to non-blocking cases,	1769	# we assume that most (but not all) of this insanity only applies to non-blocking cases,
1419	# and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to	1770	# and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to
1420	# have identity issues in that area.	1771	# have identity issues in that area.
1421	Net::SSLeay::CTX_set_mode ($self->{tls},	1772	# Net::SSLeay::CTX_set_mode ($ssl,
1422	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1)	1773	# (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1)
1423	| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2));	1774	# | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2));
		1775	Net::SSLeay::CTX_set_mode ($tls, 1|2);
1424		1776
1425	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1777	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1426	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1778	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1427		1779
		1780	Net::SSLeay::BIO_write ($self->{_rbio}, delete $self->{rbuf});
		1781
1428	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});	1782	Net::SSLeay::set_bio ($tls, $self->{_rbio}, $self->{_wbio});
		1783
		1784	$self->{_on_starttls} = sub { $_[0]{on_starttls}(@_) }
		1785	if $self->{on_starttls};
1429		1786
1430	&_dotls; # need to trigger the initial handshake	1787	&_dotls; # need to trigger the initial handshake
1431	$self->start_read; # make sure we actually do read	1788	$self->start_read; # make sure we actually do read
1432	}	1789	}
1433		1790
1434	=item $handle->stoptls	1791	=item $handle->stoptls
1435		1792
1436	Shuts down the SSL connection - this makes a proper EOF handshake by	1793	Shuts down the SSL connection - this makes a proper EOF handshake by
1437	sending a close notify to the other side, but since OpenSSL doesn't	1794	sending a close notify to the other side, but since OpenSSL doesn't
1438	support non-blocking shut downs, it is not possible to re-use the stream	1795	support non-blocking shut downs, it is not guarenteed that you can re-use
1439	afterwards.	1796	the stream afterwards.
1440		1797
1441	=cut	1798	=cut
1442		1799
1443	sub stoptls {	1800	sub stoptls {
1444	my ($self) = @_;	1801	my ($self) = @_;
…		…
1446	if ($self->{tls}) {	1803	if ($self->{tls}) {
1447	Net::SSLeay::shutdown ($self->{tls});	1804	Net::SSLeay::shutdown ($self->{tls});
1448		1805
1449	&_dotls;	1806	&_dotls;
1450		1807
1451	# we don't give a shit. no, we do, but we can't. no...	1808	# # we don't give a shit. no, we do, but we can't. no...#d#
1452	# we, we... have to use openssl :/	1809	# # we, we... have to use openssl :/#d#
1453	&_freetls;	1810	# &_freetls;#d#
1454	}	1811	}
1455	}	1812	}
1456		1813
1457	sub _freetls {	1814	sub _freetls {
1458	my ($self) = @_;	1815	my ($self) = @_;
1459		1816
1460	return unless $self->{tls};	1817	return unless $self->{tls};
1461		1818
1462	Net::SSLeay::free (delete $self->{tls});	1819	$self->{tls_ctx}->_put_session (delete $self->{tls})
		1820	if $self->{tls} > 0;
1463		1821
1464	delete @$self{qw(_rbio _wbio _tls_wbuf)};	1822	delete @$self{qw(_rbio _wbio _tls_wbuf _on_starttls)};
1465	}	1823	}
1466		1824
1467	sub DESTROY {	1825	sub DESTROY {
1468	my $self = shift;	1826	my ($self) = @_;
1469		1827
1470	&_freetls;	1828	&_freetls;
1471		1829
1472	my $linger = exists $self->{linger} ? $self->{linger} : 3600;	1830	my $linger = exists $self->{linger} ? $self->{linger} : 3600;
1473		1831
1474	if ($linger && length $self->{wbuf}) {	1832	if ($linger && length $self->{wbuf} && $self->{fh}) {
1475	my $fh = delete $self->{fh};	1833	my $fh = delete $self->{fh};
1476	my $wbuf = delete $self->{wbuf};	1834	my $wbuf = delete $self->{wbuf};
1477		1835
1478	my @linger;	1836	my @linger;
1479		1837
1480	push @linger, AnyEvent->io (fh => $fh, poll => "w", cb => sub {	1838	push @linger, AE::io $fh, 1, sub {
1481	my $len = syswrite $fh, $wbuf, length $wbuf;	1839	my $len = syswrite $fh, $wbuf, length $wbuf;
1482		1840
1483	if ($len > 0) {	1841	if ($len > 0) {
1484	substr $wbuf, 0, $len, "";	1842	substr $wbuf, 0, $len, "";
1485	} else {	1843	} else {
1486	@linger = (); # end	1844	@linger = (); # end
1487	}	1845	}
1488	});	1846	};
1489	push @linger, AnyEvent->timer (after => $linger, cb => sub {	1847	push @linger, AE::timer $linger, 0, sub {
1490	@linger = ();	1848	@linger = ();
1491	});	1849	};
1492	}	1850	}
1493	}	1851	}
1494		1852
1495	=item $handle->destroy	1853	=item $handle->destroy
1496		1854
1497	Shuts down the handle object as much as possible - this call ensures that	1855	Shuts down the handle object as much as possible - this call ensures that
1498	no further callbacks will be invoked and resources will be freed as much	1856	no further callbacks will be invoked and as many resources as possible
1499	as possible. You must not call any methods on the object afterwards.	1857	will be freed. Any method you will call on the handle object after
		1858	destroying it in this way will be silently ignored (and it will return the
		1859	empty list).
1500		1860
1501	Normally, you can just "forget" any references to an AnyEvent::Handle	1861	Normally, you can just "forget" any references to an AnyEvent::Handle
1502	object and it will simply shut down. This works in fatal error and EOF	1862	object and it will simply shut down. This works in fatal error and EOF
1503	callbacks, as well as code outside. It does I<NOT> work in a read or write	1863	callbacks, as well as code outside. It does I<NOT> work in a read or write
1504	callback, so when you want to destroy the AnyEvent::Handle object from	1864	callback, so when you want to destroy the AnyEvent::Handle object from
1505	within such an callback. You I<MUST> call C<< ->destroy >> explicitly in	1865	within such an callback. You I<MUST> call C<< ->destroy >> explicitly in
1506	that case.	1866	that case.
1507		1867
		1868	Destroying the handle object in this way has the advantage that callbacks
		1869	will be removed as well, so if those are the only reference holders (as
		1870	is common), then one doesn't need to do anything special to break any
		1871	reference cycles.
		1872
1508	The handle might still linger in the background and write out remaining	1873	The handle might still linger in the background and write out remaining
1509	data, as specified by the C<linger> option, however.	1874	data, as specified by the C<linger> option, however.
1510		1875
1511	=cut	1876	=cut
1512		1877
1513	sub destroy {	1878	sub destroy {
1514	my ($self) = @_;	1879	my ($self) = @_;
1515		1880
1516	$self->DESTROY;	1881	$self->DESTROY;
1517	%$self = ();	1882	%$self = ();
		1883	bless $self, "AnyEvent::Handle::destroyed";
		1884	}
		1885
		1886	sub AnyEvent::Handle::destroyed::AUTOLOAD {
		1887	#nop
1518	}	1888	}
1519		1889
1520	=item AnyEvent::Handle::TLS_CTX	1890	=item AnyEvent::Handle::TLS_CTX
1521		1891
1522	This function creates and returns the Net::SSLeay::CTX object used by	1892	This function creates and returns the AnyEvent::TLS object used by default
1523	default for TLS mode.	1893	for TLS mode.
1524		1894
1525	The context is created like this:	1895	The context is created by calling L<AnyEvent::TLS> without any arguments.
1526
1527	Net::SSLeay::load_error_strings;
1528	Net::SSLeay::SSLeay_add_ssl_algorithms;
1529	Net::SSLeay::randomize;
1530
1531	my $CTX = Net::SSLeay::CTX_new;
1532
1533	Net::SSLeay::CTX_set_options $CTX, Net::SSLeay::OP_ALL
1534		1896
1535	=cut	1897	=cut
1536		1898
1537	our $TLS_CTX;	1899	our $TLS_CTX;
1538		1900
1539	sub TLS_CTX() {	1901	sub TLS_CTX() {
1540	$TLS_CTX || do {	1902	$TLS_CTX ||= do {
1541	require Net::SSLeay;	1903	require AnyEvent::TLS;
1542		1904
1543	Net::SSLeay::load_error_strings ();	1905	new AnyEvent::TLS
1544	Net::SSLeay::SSLeay_add_ssl_algorithms ();
1545	Net::SSLeay::randomize ();
1546
1547	$TLS_CTX = Net::SSLeay::CTX_new ();
1548
1549	Net::SSLeay::CTX_set_options ($TLS_CTX, Net::SSLeay::OP_ALL ());
1550
1551	$TLS_CTX
1552	}	1906	}
1553	}	1907	}
1554		1908
1555	=back	1909	=back
1556		1910
…		…
1595		1949
1596	$handle->on_read (sub { });	1950	$handle->on_read (sub { });
1597	$handle->on_eof (undef);	1951	$handle->on_eof (undef);
1598	$handle->on_error (sub {	1952	$handle->on_error (sub {
1599	my $data = delete $_[0]{rbuf};	1953	my $data = delete $_[0]{rbuf};
1600	undef $handle;
1601	});	1954	});
1602		1955
1603	The reason to use C<on_error> is that TCP connections, due to latencies	1956	The reason to use C<on_error> is that TCP connections, due to latencies
1604	and packets loss, might get closed quite violently with an error, when in	1957	and packets loss, might get closed quite violently with an error, when in
1605	fact, all data has been received.	1958	fact, all data has been received.
…		…
1621	$handle->on_drain (sub {	1974	$handle->on_drain (sub {
1622	warn "all data submitted to the kernel\n";	1975	warn "all data submitted to the kernel\n";
1623	undef $handle;	1976	undef $handle;
1624	});	1977	});
1625		1978
		1979	If you just want to queue some data and then signal EOF to the other side,
		1980	consider using C<< ->push_shutdown >> instead.
		1981
		1982	=item I want to contact a TLS/SSL server, I don't care about security.
		1983
		1984	If your TLS server is a pure TLS server (e.g. HTTPS) that only speaks TLS,
		1985	simply connect to it and then create the AnyEvent::Handle with the C<tls>
		1986	parameter:
		1987
		1988	tcp_connect $host, $port, sub {
		1989	my ($fh) = @_;
		1990
		1991	my $handle = new AnyEvent::Handle
		1992	fh => $fh,
		1993	tls => "connect",
		1994	on_error => sub { ... };
		1995
		1996	$handle->push_write (...);
		1997	};
		1998
		1999	=item I want to contact a TLS/SSL server, I do care about security.
		2000
		2001	Then you should additionally enable certificate verification, including
		2002	peername verification, if the protocol you use supports it (see
		2003	L<AnyEvent::TLS>, C<verify_peername>).
		2004
		2005	E.g. for HTTPS:
		2006
		2007	tcp_connect $host, $port, sub {
		2008	my ($fh) = @_;
		2009
		2010	my $handle = new AnyEvent::Handle
		2011	fh => $fh,
		2012	peername => $host,
		2013	tls => "connect",
		2014	tls_ctx => { verify => 1, verify_peername => "https" },
		2015	...
		2016
		2017	Note that you must specify the hostname you connected to (or whatever
		2018	"peername" the protocol needs) as the C<peername> argument, otherwise no
		2019	peername verification will be done.
		2020
		2021	The above will use the system-dependent default set of trusted CA
		2022	certificates. If you want to check against a specific CA, add the
		2023	C<ca_file> (or C<ca_cert>) arguments to C<tls_ctx>:
		2024
		2025	tls_ctx => {
		2026	verify => 1,
		2027	verify_peername => "https",
		2028	ca_file => "my-ca-cert.pem",
		2029	},
		2030
		2031	=item I want to create a TLS/SSL server, how do I do that?
		2032
		2033	Well, you first need to get a server certificate and key. You have
		2034	three options: a) ask a CA (buy one, use cacert.org etc.) b) create a
		2035	self-signed certificate (cheap. check the search engine of your choice,
		2036	there are many tutorials on the net) or c) make your own CA (tinyca2 is a
		2037	nice program for that purpose).
		2038
		2039	Then create a file with your private key (in PEM format, see
		2040	L<AnyEvent::TLS>), followed by the certificate (also in PEM format). The
		2041	file should then look like this:
		2042
		2043	-----BEGIN RSA PRIVATE KEY-----
		2044	...header data
		2045	... lots of base64'y-stuff
		2046	-----END RSA PRIVATE KEY-----
		2047
		2048	-----BEGIN CERTIFICATE-----
		2049	... lots of base64'y-stuff
		2050	-----END CERTIFICATE-----
		2051
		2052	The important bits are the "PRIVATE KEY" and "CERTIFICATE" parts. Then
		2053	specify this file as C<cert_file>:
		2054
		2055	tcp_server undef, $port, sub {
		2056	my ($fh) = @_;
		2057
		2058	my $handle = new AnyEvent::Handle
		2059	fh => $fh,
		2060	tls => "accept",
		2061	tls_ctx => { cert_file => "my-server-keycert.pem" },
		2062	...
		2063
		2064	When you have intermediate CA certificates that your clients might not
		2065	know about, just append them to the C<cert_file>.
		2066
1626	=back	2067	=back
1627		2068
1628		2069
1629	=head1 SUBCLASSING AnyEvent::Handle	2070	=head1 SUBCLASSING AnyEvent::Handle
1630		2071

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