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Revision 1.178 by root, Tue Aug 11 01:15:17 2009 UTC

1	package AnyEvent::Handle;
2
3	no warnings;
4	use strict;
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 = 4.14;
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 {
32	$cv->broadcast;	15	my ($hdl, $fatal, $msg) = @_;
33	},	16	warn "got error $msg\n";
		17	$hdl->destroy;
		18	$cv->send;
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>.	37
		38	The L<AnyEvent::Intro> tutorial contains some well-documented
		39	AnyEvent::Handle examples.
53		40
54	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
55	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
56	treatment of characters applies to this module as well.	43	treatment of characters applies to this module as well.
57		44
		45	At the very minimum, you should specify C<fh> or C<connect>, and the
		46	C<on_error> callback.
		47
58	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
59	argument.	49	argument.
60		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
61	=head1 METHODS	65	=head1 METHODS
62		66
63	=over 4	67	=over 4
64		68
65	=item B<new (%args)>	69	=item $handle = B<new> AnyEvent::TLS fh => $filehandle, key => value...
66		70
67	The constructor supports these arguments (all as key => value pairs).	71	The constructor supports these arguments (all as C<< key => value >> pairs).
68		72
69	=over 4	73	=over 4
70		74
71	=item fh => $filehandle [MANDATORY]	75	=item fh => $filehandle [C<fh> or C<connect> MANDATORY]
72		76
73	The filehandle this L<AnyEvent::Handle> object will operate on.	77	The filehandle this L<AnyEvent::Handle> object will operate on.
74
75	NOTE: The filehandle will be set to non-blocking (using	78	NOTE: The filehandle will be set to non-blocking mode (using
76	AnyEvent::Util::fh_nonblocking).	79	C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in
		80	that mode.
77		81
		82	=item connect => [$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
78	=item on_eof => $cb->($handle)	99	=item on_prepare => $cb->($handle)
79		100
80	Set the callback to be called when an end-of-file condition is detcted,	101	This (rarely used) callback is called before a new connection is
81	i.e. in the case of a socket, when the other side has closed the	102	attempted, but after the file handle has been created. It could be used to
82	connection cleanly.	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).
83		106
84	While not mandatory, it is highly recommended to set an eof callback,	107	The return value of this callback should be the connect timeout value in
85	otherwise you might end up with a closed socket while you are still	108	seconds (or C<0>, or C<undef>, or the empty list, to indicate the default
86	waiting for data.	109	timeout is to be used).
87		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
88	=item on_error => $cb->($handle, $fatal)	137	=item on_error => $cb->($handle, $fatal, $message)
89		138
90	This is the error callback, which is called when, well, some error	139	This is the error callback, which is called when, well, some error
91	occured, such as not being able to resolve the hostname, failure to	140	occured, such as not being able to resolve the hostname, failure to
92	connect or a read error.	141	connect or a read error.
93		142
94	Some errors are fatal (which is indicated by C<$fatal> being true). On	143	Some errors are fatal (which is indicated by C<$fatal> being true). On
95	fatal errors the handle object will be shut down and will not be	144	fatal errors the handle object will be destroyed (by a call to C<< ->
		145	destroy >>) after invoking the error callback (which means you are free to
		146	examine the handle object). Examples of fatal errors are an EOF condition
		147	with active (but unsatisifable) read watchers (C<EPIPE>) or I/O errors. In
		148	cases where the other side can close the connection at their will it is
		149	often easiest to not report C<EPIPE> errors in this callback.
		150
		151	AnyEvent::Handle tries to find an appropriate error code for you to check
		152	against, but in some cases (TLS errors), this does not work well. It is
		153	recommended to always output the C<$message> argument in human-readable
		154	error messages (it's usually the same as C<"$!">).
		155
96	usable. Non-fatal errors can be retried by simply returning, but it is	156	Non-fatal errors can be retried by simply returning, but it is recommended
97	recommended to simply ignore this parameter and instead abondon the handle	157	to simply ignore this parameter and instead abondon the handle object
98	object when this callback is invoked.	158	when this callback is invoked. Examples of non-fatal errors are timeouts
		159	C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>).
99		160
100	On callback entrance, the value of C<$!> contains the operating system	161	On callback entrance, the value of C<$!> contains the operating system
101	error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>).	162	error code (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT>, C<EBADMSG> or
		163	C<EPROTO>).
102		164
103	While not mandatory, it is I<highly> recommended to set this callback, as	165	While not mandatory, it is I<highly> recommended to set this callback, as
104	you will not be notified of errors otherwise. The default simply calls	166	you will not be notified of errors otherwise. The default simply calls
105	C<croak>.	167	C<croak>.
106		168
…		…
110	and no read request is in the queue (unlike read queue callbacks, this	172	and no read request is in the queue (unlike read queue callbacks, this
111	callback will only be called when at least one octet of data is in the	173	callback will only be called when at least one octet of data is in the
112	read buffer).	174	read buffer).
113		175
114	To access (and remove data from) the read buffer, use the C<< ->rbuf >>	176	To access (and remove data from) the read buffer, use the C<< ->rbuf >>
115	method or access the C<$handle->{rbuf}> member directly.	177	method or access the C<< $handle->{rbuf} >> member directly. Note that you
		178	must not enlarge or modify the read buffer, you can only remove data at
		179	the beginning from it.
116		180
117	When an EOF condition is detected then AnyEvent::Handle will first try to	181	When an EOF condition is detected then AnyEvent::Handle will first try to
118	feed all the remaining data to the queued callbacks and C<on_read> before	182	feed all the remaining data to the queued callbacks and C<on_read> before
119	calling the C<on_eof> callback. If no progress can be made, then a fatal	183	calling the C<on_eof> callback. If no progress can be made, then a fatal
120	error will be raised (with C<$!> set to C<EPIPE>).	184	error will be raised (with C<$!> set to C<EPIPE>).
121		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
		191	=item on_eof => $cb->($handle)
		192
		193	Set the callback to be called when an end-of-file condition is detected,
		194	i.e. in the case of a socket, when the other side has closed the
		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).
		198
		199	For sockets, this just means that the other side has stopped sending data,
		200	you can still try to write data, and, in fact, one can return from the EOF
		201	callback and continue writing data, as only the read part has been shut
		202	down.
		203
		204	If an EOF condition has been detected but no C<on_eof> callback has been
		205	set, then a fatal error will be raised with C<$!> set to <0>.
		206
122	=item on_drain => $cb->($handle)	207	=item on_drain => $cb->($handle)
123		208
124	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
125	(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).
126		211
127	To append to the write buffer, use the C<< ->push_write >> method.	212	To append to the write buffer, use the C<< ->push_write >> method.
128		213
		214	This callback is useful when you don't want to put all of your write data
		215	into the queue at once, for example, when you want to write the contents
		216	of some file to the socket you might not want to read the whole file into
		217	memory and push it into the queue, but instead only read more data from
		218	the file when the write queue becomes empty.
		219
129	=item timeout => $fractional_seconds	220	=item timeout => $fractional_seconds
130		221
		222	=item rtimeout => $fractional_seconds
		223
		224	=item wtimeout => $fractional_seconds
		225
131	If non-zero, then this enables an "inactivity" timeout: whenever this many	226	If non-zero, then these enables an "inactivity" timeout: whenever this
132	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
133	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
134	missing, an 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>.
135		237
136	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
137	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
138	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
139	in the C<on_timeout> callback.	241	in the C<on_timeout> callback, in which case AnyEvent::Handle will simply
		242	restart the timeout.
140		243
141	Zero (the default) disables this timeout.	244	Zero (the default) disables this timeout.
142		245
143	=item on_timeout => $cb->($handle)	246	=item on_timeout => $cb->($handle)
144		247
…		…
148		251
149	=item rbuf_max => <bytes>	252	=item rbuf_max => <bytes>
150		253
151	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)	254	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)
152	when the read buffer ever (strictly) exceeds this size. This is useful to	255	when the read buffer ever (strictly) exceeds this size. This is useful to
153	avoid denial-of-service attacks.	256	avoid some forms of denial-of-service attacks.
154		257
155	For example, a server accepting connections from untrusted sources should	258	For example, a server accepting connections from untrusted sources should
156	be configured to accept only so-and-so much data that it cannot act on	259	be configured to accept only so-and-so much data that it cannot act on
157	(for example, when expecting a line, an attacker could send an unlimited	260	(for example, when expecting a line, an attacker could send an unlimited
158	amount of data without a callback ever being called as long as the line	261	amount of data without a callback ever being called as long as the line
159	isn't finished).	262	isn't finished).
160		263
		264	=item autocork => <boolean>
		265
		266	When disabled (the default), then C<push_write> will try to immediately
		267	write the data to the handle, if possible. This avoids having to register
		268	a write watcher and wait for the next event loop iteration, but can
		269	be inefficient if you write multiple small chunks (on the wire, this
		270	disadvantage is usually avoided by your kernel's nagle algorithm, see
		271	C<no_delay>, but this option can save costly syscalls).
		272
		273	When enabled, then writes will always be queued till the next event loop
		274	iteration. This is efficient when you do many small writes per iteration,
		275	but less efficient when you do a single write only per iteration (or when
		276	the write buffer often is full). It also increases write latency.
		277
		278	=item no_delay => <boolean>
		279
		280	When doing small writes on sockets, your operating system kernel might
		281	wait a bit for more data before actually sending it out. This is called
		282	the Nagle algorithm, and usually it is beneficial.
		283
		284	In some situations you want as low a delay as possible, which can be
		285	accomplishd by setting this option to a true value.
		286
		287	The default is your opertaing system's default behaviour (most likely
		288	enabled), this option explicitly enables or disables it, if possible.
		289
161	=item read_size => <bytes>	290	=item read_size => <bytes>
162		291
163	The default read block size (the amount of bytes this module will try to read	292	The default read block size (the amount of bytes this module will
164	during each (loop iteration). Default: C<8192>.	293	try to read during each loop iteration, which affects memory
		294	requirements). Default: C<8192>.
165		295
166	=item low_water_mark => <bytes>	296	=item low_water_mark => <bytes>
167		297
168	Sets the amount of bytes (default: C<0>) that make up an "empty" write	298	Sets the amount of bytes (default: C<0>) that make up an "empty" write
169	buffer: If the write reaches this size or gets even samller it is	299	buffer: If the write reaches this size or gets even samller it is
170	considered empty.	300	considered empty.
171		301
		302	Sometimes it can be beneficial (for performance reasons) to add data to
		303	the write buffer before it is fully drained, but this is a rare case, as
		304	the operating system kernel usually buffers data as well, so the default
		305	is good in almost all cases.
		306
		307	=item linger => <seconds>
		308
		309	If non-zero (default: C<3600>), then the destructor of the
		310	AnyEvent::Handle object will check whether there is still outstanding
		311	write data and will install a watcher that will write this data to the
		312	socket. No errors will be reported (this mostly matches how the operating
		313	system treats outstanding data at socket close time).
		314
		315	This will not work for partial TLS data that could not be encoded
		316	yet. This data will be lost. Calling the C<stoptls> method in time might
		317	help.
		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
172	=item tls => "accept" | "connect" | Net::SSLeay::SSL object	329	=item tls => "accept" | "connect" | Net::SSLeay::SSL object
173		330
174	When this parameter is given, it enables TLS (SSL) mode, that means it	331	When this parameter is given, it enables TLS (SSL) mode, that means
175	will start making tls handshake and will transparently encrypt/decrypt	332	AnyEvent will start a TLS handshake as soon as the conenction has been
176	data.	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.
177		337
178	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
179	automatically when you try to create a TLS handle).	339	automatically when you try to create a TLS handle): this module doesn't
		340	have a dependency on that module, so if your module requires it, you have
		341	to add the dependency yourself.
180		342
181	For the TLS server side, use C<accept>, and for the TLS client side of a	343	Unlike TCP, TLS has a server and client side: for the TLS server side, use
182	connection, use C<connect> mode.	344	C<accept>, and for the TLS client side of a connection, use C<connect>
		345	mode.
183		346
184	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
185	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>
186	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
187	AnyEvent::Handle.	350	AnyEvent::Handle. Also, this module will take ownership of this connection
		351	object.
188		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.
		356
		357	B<IMPORTANT:> since Net::SSLeay "objects" are really only integers,
		358	passing in the wrong integer will lead to certain crash. This most often
		359	happens when one uses a stylish C<< tls => 1 >> and is surprised about the
		360	segmentation fault.
		361
189	See the C<starttls> method if you need to start TLs negotiation later.	362	See the C<< ->starttls >> method for when need to start TLS negotiation later.
190		363
191	=item tls_ctx => $ssl_ctx	364	=item tls_ctx => $anyevent_tls
192		365
193	Use the given Net::SSLeay::CTX object to create the new TLS connection	366	Use the given C<AnyEvent::TLS> object to create the new TLS connection
194	(unless a connection object was specified directly). If this parameter is	367	(unless a connection object was specified directly). If this parameter is
195	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.	368	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.
196		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.
		405
197	=item json => JSON or JSON::XS object	406	=item json => JSON or JSON::XS object
198		407
199	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.
200		409
201	If you don't supply it, then AnyEvent::Handle will create and use a	410	If you don't supply it, then AnyEvent::Handle will create and use a
202	suitable one, which will write and expect UTF-8 encoded JSON texts.	411	suitable one (on demand), which will write and expect UTF-8 encoded JSON
		412	texts.
203		413
204	Note that you are responsible to depend on the JSON module if you want to	414	Note that you are responsible to depend on the JSON module if you want to
205	use this functionality, as AnyEvent does not have a dependency itself.	415	use this functionality, as AnyEvent does not have a dependency itself.
206		416
207	=item filter_r => $cb
208
209	=item filter_w => $cb
210
211	These exist, but are undocumented at this time.
212
213	=back	417	=back
214		418
215	=cut	419	=cut
216		420
217	sub new {	421	sub new {
218	my $class = shift;	422	my $class = shift;
219
220	my $self = bless { @_ }, $class;	423	my $self = bless { @_ }, $class;
221		424
222	$self->{fh} or Carp::croak "mandatory argument fh is missing";	425	if ($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) = @_;
223		488
224	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;	489	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;
225		490
226	if ($self->{tls}) {	491	$self->{_activity} =
227	require Net::SSLeay;	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};
		500
228	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx});	501	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx})
229	}	502	if $self->{tls};
230
231	$self->{_activity} = AnyEvent->now;
232	$self->_timeout;
233		503
234	$self->on_drain (delete $self->{on_drain}) if $self->{on_drain};	504	$self->on_drain (delete $self->{on_drain}) if $self->{on_drain};
235		505
236	$self	506	$self->start_read
237	}	507	if $self->{on_read} || @{ $self->{_queue} };
238		508
239	sub _shutdown {	509	$self->_drain_wbuf;
240	my ($self) = @_;
241
242	delete $self->{_tw};
243	delete $self->{_rw};
244	delete $self->{_ww};
245	delete $self->{fh};
246
247	$self->stoptls;
248	}	510	}
249		511
250	sub _error {	512	sub _error {
251	my ($self, $errno, $fatal) = @_;	513	my ($self, $errno, $fatal, $message) = @_;
252
253	$self->_shutdown
254	if $fatal;
255		514
256	$! = $errno;	515	$! = $errno;
		516	$message ||= "$!";
257		517
258	if ($self->{on_error}) {	518	if ($self->{on_error}) {
259	$self->{on_error}($self, $fatal);	519	$self->{on_error}($self, $fatal, $message);
260	} else {	520	$self->destroy if $fatal;
		521	} elsif ($self->{fh}) {
		522	$self->destroy;
261	Carp::croak "AnyEvent::Handle uncaught error: $!";	523	Carp::croak "AnyEvent::Handle uncaught error: $message";
262	}	524	}
263	}	525	}
264		526
265	=item $fh = $handle->fh	527	=item $fh = $handle->fh
266		528
267	This method returns the file handle of the L<AnyEvent::Handle> object.	529	This method returns the file handle used to create the L<AnyEvent::Handle> object.
268		530
269	=cut	531	=cut
270		532
271	sub fh { $_[0]{fh} }	533	sub fh { $_[0]{fh} }
272		534
…		…
290	$_[0]{on_eof} = $_[1];	552	$_[0]{on_eof} = $_[1];
291	}	553	}
292		554
293	=item $handle->on_timeout ($cb)	555	=item $handle->on_timeout ($cb)
294		556
295	Replace the current C<on_timeout> callback, or disables the callback	557	=item $handle->on_rtimeout ($cb)
296	(but not the timeout) if C<$cb> = C<undef>. See C<timeout> constructor
297	argument.
298		558
299	=cut	559	=item $handle->on_wtimeout ($cb)
300		560
301	sub on_timeout {	561	Replace the current C<on_timeout>, C<on_rtimeout> or C<on_wtimeout>
		562	callback, or disables the callback (but not the timeout) if C<$cb> =
		563	C<undef>. See the C<timeout> constructor argument and method.
		564
		565	=cut
		566
		567	# see below
		568
		569	=item $handle->autocork ($boolean)
		570
		571	Enables or disables the current autocork behaviour (see C<autocork>
		572	constructor argument). Changes will only take effect on the next write.
		573
		574	=cut
		575
		576	sub autocork {
		577	$_[0]{autocork} = $_[1];
		578	}
		579
		580	=item $handle->no_delay ($boolean)
		581
		582	Enables or disables the C<no_delay> setting (see constructor argument of
		583	the same name for details).
		584
		585	=cut
		586
		587	sub no_delay {
		588	$_[0]{no_delay} = $_[1];
		589
		590	eval {
		591	local $SIG{__DIE__};
		592	setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1]
		593	if $_[0]{fh};
		594	};
		595	}
		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 {
302	$_[0]{on_timeout} = $_[1];	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];
303	}	625	}
304		626
305	#############################################################################	627	#############################################################################
306		628
307	=item $handle->timeout ($seconds)	629	=item $handle->timeout ($seconds)
308		630
		631	=item $handle->rtimeout ($seconds)
		632
		633	=item $handle->wtimeout ($seconds)
		634
309	Configures (or disables) the inactivity timeout.	635	Configures (or disables) the inactivity timeout.
310		636
311	=cut	637	=item $handle->timeout_reset
312		638
313	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 {
314	my ($self, $timeout) = @_;	661	my ($self, $new_value) = @_;
315		662
316	$self->{timeout} = $timeout;	663	$self->{$timeout} = $new_value;
317	$self->_timeout;	664	delete $self->{$tw}; &$cb;
318	}	665	};
319		666
		667	*{"${dir}timeout_reset"} = sub {
		668	$_[0]{$activity} = AE::now;
		669	};
		670
		671	# main workhorse:
320	# reset the timeout watcher, as neccessary	672	# reset the timeout watcher, as neccessary
321	# also check for time-outs	673	# also check for time-outs
322	sub _timeout {	674	$cb = sub {
323	my ($self) = @_;	675	my ($self) = @_;
324		676
325	if ($self->{timeout}) {	677	if ($self->{$timeout} && $self->{fh}) {
326	my $NOW = AnyEvent->now;	678	my $NOW = AE::now;
327		679
328	# when would the timeout trigger?	680	# when would the timeout trigger?
329	my $after = $self->{_activity} + $self->{timeout} - $NOW;	681	my $after = $self->{$activity} + $self->{$timeout} - $NOW;
330		682
331	# now or in the past already?	683	# now or in the past already?
332	if ($after <= 0) {	684	if ($after <= 0) {
333	$self->{_activity} = $NOW;	685	$self->{$activity} = $NOW;
334		686
335	if ($self->{on_timeout}) {	687	if ($self->{$on_timeout}) {
336	$self->{on_timeout}($self);	688	$self->{$on_timeout}($self);
337	} else {	689	} else {
338	$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};
339	}	698	}
340		699
341	# callback could have changed timeout value, optimise	700	Scalar::Util::weaken $self;
342	return unless $self->{timeout};	701	return unless $self; # ->error could have destroyed $self
343		702
344	# calculate new after	703	$self->{$tw} ||= AE::timer $after, 0, sub {
345	$after = $self->{timeout};	704	delete $self->{$tw};
		705	$cb->($self);
		706	};
		707	} else {
		708	delete $self->{$tw};
346	}	709	}
347
348	Scalar::Util::weaken $self;
349	return unless $self; # ->error could have destroyed $self
350
351	$self->{_tw} ||= AnyEvent->timer (after => $after, cb => sub {
352	delete $self->{_tw};
353	$self->_timeout;
354	});
355	} else {
356	delete $self->{_tw};
357	}	710	}
358	}	711	}
359		712
360	#############################################################################	713	#############################################################################
361		714
…		…
385	my ($self, $cb) = @_;	738	my ($self, $cb) = @_;
386		739
387	$self->{on_drain} = $cb;	740	$self->{on_drain} = $cb;
388		741
389	$cb->($self)	742	$cb->($self)
390	if $cb && $self->{low_water_mark} >= length $self->{wbuf};	743	if $cb && $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf});
391	}	744	}
392		745
393	=item $handle->push_write ($data)	746	=item $handle->push_write ($data)
394		747
395	Queues the given scalar to be written. You can push as much data as you	748	Queues the given scalar to be written. You can push as much data as you
…		…
406	Scalar::Util::weaken $self;	759	Scalar::Util::weaken $self;
407		760
408	my $cb = sub {	761	my $cb = sub {
409	my $len = syswrite $self->{fh}, $self->{wbuf};	762	my $len = syswrite $self->{fh}, $self->{wbuf};
410		763
411	if ($len >= 0) {	764	if (defined $len) {
412	substr $self->{wbuf}, 0, $len, "";	765	substr $self->{wbuf}, 0, $len, "";
413		766
414	$self->{_activity} = AnyEvent->now;	767	$self->{_activity} = $self->{_wactivity} = AE::now;
415		768
416	$self->{on_drain}($self)	769	$self->{on_drain}($self)
417	if $self->{low_water_mark} >= length $self->{wbuf}	770	if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf})
418	&& $self->{on_drain};	771	&& $self->{on_drain};
419		772
420	delete $self->{_ww} unless length $self->{wbuf};	773	delete $self->{_ww} unless length $self->{wbuf};
421	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	774	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
422	$self->_error ($!, 1);	775	$self->_error ($!, 1);
423	}	776	}
424	};	777	};
425		778
426	# try to write data immediately	779	# try to write data immediately
427	$cb->();	780	$cb->() unless $self->{autocork};
428		781
429	# if still data left in wbuf, we need to poll	782	# if still data left in wbuf, we need to poll
430	$self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb)	783	$self->{_ww} = AE::io $self->{fh}, 1, $cb
431	if length $self->{wbuf};	784	if length $self->{wbuf};
432	};	785	};
433	}	786	}
434		787
435	our %WH;	788	our %WH;
…		…
446		799
447	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")	800	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")
448	->($self, @_);	801	->($self, @_);
449	}	802	}
450		803
451	if ($self->{filter_w}) {	804	if ($self->{tls}) {
452	$self->{filter_w}($self, \$_[0]);	805	$self->{_tls_wbuf} .= $_[0];
		806	&_dotls ($self) if $self->{fh};
453	} else {	807	} else {
454	$self->{wbuf} .= $_[0];	808	$self->{wbuf} .= $_[0];
455	$self->_drain_wbuf;	809	$self->_drain_wbuf if $self->{fh};
456	}	810	}
457	}	811	}
458		812
459	=item $handle->push_write (type => @args)	813	=item $handle->push_write (type => @args)
460		814
…		…
474	=cut	828	=cut
475		829
476	register_write_type netstring => sub {	830	register_write_type netstring => sub {
477	my ($self, $string) = @_;	831	my ($self, $string) = @_;
478		832
479	sprintf "%d:%s,", (length $string), $string	833	(length $string) . ":$string,"
480	};	834	};
481		835
482	=item packstring => $format, $data	836	=item packstring => $format, $data
483		837
484	An octet string prefixed with an encoded length. The encoding C<$format>	838	An octet string prefixed with an encoded length. The encoding C<$format>
…		…
489	=cut	843	=cut
490		844
491	register_write_type packstring => sub {	845	register_write_type packstring => sub {
492	my ($self, $format, $string) = @_;	846	my ($self, $format, $string) = @_;
493		847
494	pack "$format/a", $string	848	pack "$format/a*", $string
495	};	849	};
496		850
497	=item json => $array_or_hashref	851	=item json => $array_or_hashref
498		852
499	Encodes the given hash or array reference into a JSON object. Unless you	853	Encodes the given hash or array reference into a JSON object. Unless you
…		…
533		887
534	$self->{json} ? $self->{json}->encode ($ref)	888	$self->{json} ? $self->{json}->encode ($ref)
535	: JSON::encode_json ($ref)	889	: JSON::encode_json ($ref)
536	};	890	};
537		891
		892	=item storable => $reference
		893
		894	Freezes the given reference using L<Storable> and writes it to the
		895	handle. Uses the C<nfreeze> format.
		896
		897	=cut
		898
		899	register_write_type storable => sub {
		900	my ($self, $ref) = @_;
		901
		902	require Storable;
		903
		904	pack "w/a*", Storable::nfreeze ($ref)
		905	};
		906
538	=back	907	=back
		908
		909	=item $handle->push_shutdown
		910
		911	Sometimes you know you want to close the socket after writing your data
		912	before it was actually written. One way to do that is to replace your
		913	C<on_drain> handler by a callback that shuts down the socket (and set
		914	C<low_water_mark> to C<0>). This method is a shorthand for just that, and
		915	replaces the C<on_drain> callback with:
		916
		917	sub { shutdown $_[0]{fh}, 1 } # for push_shutdown
		918
		919	This simply shuts down the write side and signals an EOF condition to the
		920	the peer.
		921
		922	You can rely on the normal read queue and C<on_eof> handling
		923	afterwards. This is the cleanest way to close a connection.
		924
		925	=cut
		926
		927	sub push_shutdown {
		928	my ($self) = @_;
		929
		930	delete $self->{low_water_mark};
		931	$self->on_drain (sub { shutdown $_[0]{fh}, 1 });
		932	}
539		933
540	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)	934	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)
541		935
542	This function (not method) lets you add your own types to C<push_write>.	936	This function (not method) lets you add your own types to C<push_write>.
543	Whenever the given C<type> is used, C<push_write> will invoke the code	937	Whenever the given C<type> is used, C<push_write> will invoke the code
…		…
564	ways, the "simple" way, using only C<on_read> and the "complex" way, using	958	ways, the "simple" way, using only C<on_read> and the "complex" way, using
565	a queue.	959	a queue.
566		960
567	In the simple case, you just install an C<on_read> callback and whenever	961	In the simple case, you just install an C<on_read> callback and whenever
568	new data arrives, it will be called. You can then remove some data (if	962	new data arrives, it will be called. You can then remove some data (if
569	enough is there) from the read buffer (C<< $handle->rbuf >>) if you want	963	enough is there) from the read buffer (C<< $handle->rbuf >>). Or you cna
570	or not.	964	leave the data there if you want to accumulate more (e.g. when only a
		965	partial message has been received so far).
571		966
572	In the more complex case, you want to queue multiple callbacks. In this	967	In the more complex case, you want to queue multiple callbacks. In this
573	case, AnyEvent::Handle will call the first queued callback each time new	968	case, AnyEvent::Handle will call the first queued callback each time new
574	data arrives (also the first time it is queued) and removes it when it has	969	data arrives (also the first time it is queued) and removes it when it has
575	done its job (see C<push_read>, below).	970	done its job (see C<push_read>, below).
…		…
593	# handle xml	988	# handle xml
594	});	989	});
595	});	990	});
596	});	991	});
597		992
598	Example 2: Implement a client for a protocol that replies either with	993	Example 2: Implement a client for a protocol that replies either with "OK"
599	"OK" and another line or "ERROR" for one request, and 64 bytes for the	994	and another line or "ERROR" for the first request that is sent, and 64
600	second request. Due tot he availability of a full queue, we can just	995	bytes for the second request. Due to the availability of a queue, we can
601	pipeline sending both requests and manipulate the queue as necessary in	996	just pipeline sending both requests and manipulate the queue as necessary
602	the callbacks:	997	in the callbacks.
603		998
604	# request one	999	When the first callback is called and sees an "OK" response, it will
		1000	C<unshift> another line-read. This line-read will be queued I<before> the
		1001	64-byte chunk callback.
		1002
		1003	# request one, returns either "OK + extra line" or "ERROR"
605	$handle->push_write ("request 1\015\012");	1004	$handle->push_write ("request 1\015\012");
606		1005
607	# we expect "ERROR" or "OK" as response, so push a line read	1006	# we expect "ERROR" or "OK" as response, so push a line read
608	$handle->push_read (line => sub {	1007	$handle->push_read (line => sub {
609	# if we got an "OK", we have to _prepend_ another line,	1008	# if we got an "OK", we have to _prepend_ another line,
…		…
616	...	1015	...
617	});	1016	});
618	}	1017	}
619	});	1018	});
620		1019
621	# request two	1020	# request two, simply returns 64 octets
622	$handle->push_write ("request 2\015\012");	1021	$handle->push_write ("request 2\015\012");
623		1022
624	# simply read 64 bytes, always	1023	# simply read 64 bytes, always
625	$handle->push_read (chunk => 64, sub {	1024	$handle->push_read (chunk => 64, sub {
626	my $response = $_[1];	1025	my $response = $_[1];
…		…
632	=cut	1031	=cut
633		1032
634	sub _drain_rbuf {	1033	sub _drain_rbuf {
635	my ($self) = @_;	1034	my ($self) = @_;
636		1035
		1036	# avoid recursion
		1037	return if $self->{_skip_drain_rbuf};
637	local $self->{_in_drain} = 1;	1038	local $self->{_skip_drain_rbuf} = 1;
638
639	if (
640	defined $self->{rbuf_max}
641	&& $self->{rbuf_max} < length $self->{rbuf}
642	) {
643	return $self->_error (&Errno::ENOSPC, 1);
644	}
645		1039
646	while () {	1040	while () {
647	no strict 'refs';	1041	# we need to use a separate tls read buffer, as we must not receive data while
		1042	# we are draining the buffer, and this can only happen with TLS.
		1043	$self->{rbuf} .= delete $self->{_tls_rbuf}
		1044	if exists $self->{_tls_rbuf};
648		1045
649	my $len = length $self->{rbuf};	1046	my $len = length $self->{rbuf};
650		1047
651	if (my $cb = shift @{ $self->{_queue} }) {	1048	if (my $cb = shift @{ $self->{_queue} }) {
652	unless ($cb->($self)) {	1049	unless ($cb->($self)) {
653	if ($self->{_eof}) {	1050	# no progress can be made
654	# no progress can be made (not enough data and no data forthcoming)	1051	# (not enough data and no data forthcoming)
655	$self->_error (&Errno::EPIPE, 1), last;	1052	$self->_error (Errno::EPIPE, 1), return
656	}	1053	if $self->{_eof};
657		1054
658	unshift @{ $self->{_queue} }, $cb;	1055	unshift @{ $self->{_queue} }, $cb;
659	last;	1056	last;
660	}	1057	}
661	} elsif ($self->{on_read}) {	1058	} elsif ($self->{on_read}) {
…		…
668	&& !@{ $self->{_queue} } # and the queue is still empty	1065	&& !@{ $self->{_queue} } # and the queue is still empty
669	&& $self->{on_read} # but we still have on_read	1066	&& $self->{on_read} # but we still have on_read
670	) {	1067	) {
671	# no further data will arrive	1068	# no further data will arrive
672	# so no progress can be made	1069	# so no progress can be made
673	$self->_error (&Errno::EPIPE, 1), last	1070	$self->_error (Errno::EPIPE, 1), return
674	if $self->{_eof};	1071	if $self->{_eof};
675		1072
676	last; # more data might arrive	1073	last; # more data might arrive
677	}	1074	}
678	} else {	1075	} else {
679	# read side becomes idle	1076	# read side becomes idle
680	delete $self->{_rw};	1077	delete $self->{_rw} unless $self->{tls};
681	last;	1078	last;
682	}	1079	}
683	}	1080	}
684		1081
		1082	if ($self->{_eof}) {
		1083	$self->{on_eof}
685	$self->{on_eof}($self)	1084	? $self->{on_eof}($self)
686	if $self->{_eof} && $self->{on_eof};	1085	: $self->_error (0, 1, "Unexpected end-of-file");
		1086
		1087	return;
		1088	}
		1089
		1090	if (
		1091	defined $self->{rbuf_max}
		1092	&& $self->{rbuf_max} < length $self->{rbuf}
		1093	) {
		1094	$self->_error (Errno::ENOSPC, 1), return;
		1095	}
687		1096
688	# may need to restart read watcher	1097	# may need to restart read watcher
689	unless ($self->{_rw}) {	1098	unless ($self->{_rw}) {
690	$self->start_read	1099	$self->start_read
691	if $self->{on_read} || @{ $self->{_queue} };	1100	if $self->{on_read} || @{ $self->{_queue} };
…		…
702		1111
703	sub on_read {	1112	sub on_read {
704	my ($self, $cb) = @_;	1113	my ($self, $cb) = @_;
705		1114
706	$self->{on_read} = $cb;	1115	$self->{on_read} = $cb;
707	$self->_drain_rbuf if $cb && !$self->{_in_drain};	1116	$self->_drain_rbuf if $cb;
708	}	1117	}
709		1118
710	=item $handle->rbuf	1119	=item $handle->rbuf
711		1120
712	Returns the read buffer (as a modifiable lvalue).	1121	Returns the read buffer (as a modifiable lvalue).
713		1122
714	You can access the read buffer directly as the C<< ->{rbuf} >> member, if	1123	You can access the read buffer directly as the C<< ->{rbuf} >>
715	you want.	1124	member, if you want. However, the only operation allowed on the
		1125	read buffer (apart from looking at it) is removing data from its
		1126	beginning. Otherwise modifying or appending to it is not allowed and will
		1127	lead to hard-to-track-down bugs.
716		1128
717	NOTE: The read buffer should only be used or modified if the C<on_read>,	1129	NOTE: The read buffer should only be used or modified if the C<on_read>,
718	C<push_read> or C<unshift_read> methods are used. The other read methods	1130	C<push_read> or C<unshift_read> methods are used. The other read methods
719	automatically manage the read buffer.	1131	automatically manage the read buffer.
720		1132
…		…
761	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read")	1173	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read")
762	->($self, $cb, @_);	1174	->($self, $cb, @_);
763	}	1175	}
764		1176
765	push @{ $self->{_queue} }, $cb;	1177	push @{ $self->{_queue} }, $cb;
766	$self->_drain_rbuf unless $self->{_in_drain};	1178	$self->_drain_rbuf;
767	}	1179	}
768		1180
769	sub unshift_read {	1181	sub unshift_read {
770	my $self = shift;	1182	my $self = shift;
771	my $cb = pop;	1183	my $cb = pop;
…		…
777	->($self, $cb, @_);	1189	->($self, $cb, @_);
778	}	1190	}
779		1191
780		1192
781	unshift @{ $self->{_queue} }, $cb;	1193	unshift @{ $self->{_queue} }, $cb;
782	$self->_drain_rbuf unless $self->{_in_drain};	1194	$self->_drain_rbuf;
783	}	1195	}
784		1196
785	=item $handle->push_read (type => @args, $cb)	1197	=item $handle->push_read (type => @args, $cb)
786		1198
787	=item $handle->unshift_read (type => @args, $cb)	1199	=item $handle->unshift_read (type => @args, $cb)
…		…
817	$cb->($_[0], substr $_[0]{rbuf}, 0, $len, "");	1229	$cb->($_[0], substr $_[0]{rbuf}, 0, $len, "");
818	1	1230	1
819	}	1231	}
820	};	1232	};
821		1233
822	# compatibility with older API
823	sub push_read_chunk {
824	$_[0]->push_read (chunk => $_[1], $_[2]);
825	}
826
827	sub unshift_read_chunk {
828	$_[0]->unshift_read (chunk => $_[1], $_[2]);
829	}
830
831	=item line => [$eol, ]$cb->($handle, $line, $eol)	1234	=item line => [$eol, ]$cb->($handle, $line, $eol)
832		1235
833	The callback will be called only once a full line (including the end of	1236	The callback will be called only once a full line (including the end of
834	line marker, C<$eol>) has been read. This line (excluding the end of line	1237	line marker, C<$eol>) has been read. This line (excluding the end of line
835	marker) will be passed to the callback as second argument (C<$line>), and	1238	marker) will be passed to the callback as second argument (C<$line>), and
…		…
850	=cut	1253	=cut
851		1254
852	register_read_type line => sub {	1255	register_read_type line => sub {
853	my ($self, $cb, $eol) = @_;	1256	my ($self, $cb, $eol) = @_;
854		1257
855	$eol = qr|(\015?\012)| if @_ < 3;	1258	if (@_ < 3) {
		1259	# this is more than twice as fast as the generic code below
		1260	sub {
		1261	$_[0]{rbuf} =~ s/^([^\015\012]*)(\015?\012)// or return;
		1262
		1263	$cb->($_[0], $1, $2);
		1264	1
		1265	}
		1266	} else {
856	$eol = quotemeta $eol unless ref $eol;	1267	$eol = quotemeta $eol unless ref $eol;
857	$eol = qr|^(.*?)($eol)|s;	1268	$eol = qr|^(.*?)($eol)|s;
858		1269
859	sub {	1270	sub {
860	$_[0]{rbuf} =~ s/$eol// or return;	1271	$_[0]{rbuf} =~ s/$eol// or return;
861		1272
862	$cb->($_[0], $1, $2);	1273	$cb->($_[0], $1, $2);
		1274	1
863	1	1275	}
864	}	1276	}
865	};	1277	};
866
867	# compatibility with older API
868	sub push_read_line {
869	my $self = shift;
870	$self->push_read (line => @_);
871	}
872
873	sub unshift_read_line {
874	my $self = shift;
875	$self->unshift_read (line => @_);
876	}
877		1278
878	=item regex => $accept[, $reject[, $skip], $cb->($handle, $data)	1279	=item regex => $accept[, $reject[, $skip], $cb->($handle, $data)
879		1280
880	Makes a regex match against the regex object C<$accept> and returns	1281	Makes a regex match against the regex object C<$accept> and returns
881	everything up to and including the match.	1282	everything up to and including the match.
…		…
931	return 1;	1332	return 1;
932	}	1333	}
933		1334
934	# reject	1335	# reject
935	if ($reject && $$rbuf =~ $reject) {	1336	if ($reject && $$rbuf =~ $reject) {
936	$self->_error (&Errno::EBADMSG);	1337	$self->_error (Errno::EBADMSG);
937	}	1338	}
938		1339
939	# skip	1340	# skip
940	if ($skip && $$rbuf =~ $skip) {	1341	if ($skip && $$rbuf =~ $skip) {
941	$data .= substr $$rbuf, 0, $+[0], "";	1342	$data .= substr $$rbuf, 0, $+[0], "";
…		…
957	my ($self, $cb) = @_;	1358	my ($self, $cb) = @_;
958		1359
959	sub {	1360	sub {
960	unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) {	1361	unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) {
961	if ($_[0]{rbuf} =~ /[^0-9]/) {	1362	if ($_[0]{rbuf} =~ /[^0-9]/) {
962	$self->_error (&Errno::EBADMSG);	1363	$self->_error (Errno::EBADMSG);
963	}	1364	}
964	return;	1365	return;
965	}	1366	}
966		1367
967	my $len = $1;	1368	my $len = $1;
…		…
970	my $string = $_[1];	1371	my $string = $_[1];
971	$_[0]->unshift_read (chunk => 1, sub {	1372	$_[0]->unshift_read (chunk => 1, sub {
972	if ($_[1] eq ",") {	1373	if ($_[1] eq ",") {
973	$cb->($_[0], $string);	1374	$cb->($_[0], $string);
974	} else {	1375	} else {
975	$self->_error (&Errno::EBADMSG);	1376	$self->_error (Errno::EBADMSG);
976	}	1377	}
977	});	1378	});
978	});	1379	});
979		1380
980	1	1381	1
…		…
986	An octet string prefixed with an encoded length. The encoding C<$format>	1387	An octet string prefixed with an encoded length. The encoding C<$format>
987	uses the same format as a Perl C<pack> format, but must specify a single	1388	uses the same format as a Perl C<pack> format, but must specify a single
988	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an	1389	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an
989	optional C<!>, C<< < >> or C<< > >> modifier).	1390	optional C<!>, C<< < >> or C<< > >> modifier).
990		1391
991	DNS over TCP uses a prefix of C<n>, EPP uses a prefix of C<N>.	1392	For example, DNS over TCP uses a prefix of C<n> (2 octet network order),
		1393	EPP uses a prefix of C<N> (4 octtes).
992		1394
993	Example: read a block of data prefixed by its length in BER-encoded	1395	Example: read a block of data prefixed by its length in BER-encoded
994	format (very efficient).	1396	format (very efficient).
995		1397
996	$handle->push_read (packstring => "w", sub {	1398	$handle->push_read (packstring => "w", sub {
…		…
1002	register_read_type packstring => sub {	1404	register_read_type packstring => sub {
1003	my ($self, $cb, $format) = @_;	1405	my ($self, $cb, $format) = @_;
1004		1406
1005	sub {	1407	sub {
1006	# when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method	1408	# when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method
1007	defined (my $len = eval { unpack $format, $_[0]->{rbuf} })	1409	defined (my $len = eval { unpack $format, $_[0]{rbuf} })
1008	or return;	1410	or return;
1009		1411
		1412	$format = length pack $format, $len;
		1413
		1414	# bypass unshift if we already have the remaining chunk
		1415	if ($format + $len <= length $_[0]{rbuf}) {
		1416	my $data = substr $_[0]{rbuf}, $format, $len;
		1417	substr $_[0]{rbuf}, 0, $format + $len, "";
		1418	$cb->($_[0], $data);
		1419	} else {
1010	# remove prefix	1420	# remove prefix
1011	substr $_[0]->{rbuf}, 0, (length pack $format, $len), "";	1421	substr $_[0]{rbuf}, 0, $format, "";
1012		1422
1013	# read rest	1423	# read remaining chunk
1014	$_[0]->unshift_read (chunk => $len, $cb);	1424	$_[0]->unshift_read (chunk => $len, $cb);
		1425	}
1015		1426
1016	1	1427	1
1017	}	1428	}
1018	};	1429	};
1019		1430
1020	=item json => $cb->($handle, $hash_or_arrayref)	1431	=item json => $cb->($handle, $hash_or_arrayref)
1021		1432
1022	Reads a JSON object or array, decodes it and passes it to the callback.	1433	Reads a JSON object or array, decodes it and passes it to the
		1434	callback. When a parse error occurs, an C<EBADMSG> error will be raised.
1023		1435
1024	If a C<json> object was passed to the constructor, then that will be used	1436	If a C<json> object was passed to the constructor, then that will be used
1025	for the final decode, otherwise it will create a JSON coder expecting UTF-8.	1437	for the final decode, otherwise it will create a JSON coder expecting UTF-8.
1026		1438
1027	This read type uses the incremental parser available with JSON version	1439	This read type uses the incremental parser available with JSON version
…		…
1034	the C<json> write type description, above, for an actual example.	1446	the C<json> write type description, above, for an actual example.
1035		1447
1036	=cut	1448	=cut
1037		1449
1038	register_read_type json => sub {	1450	register_read_type json => sub {
1039	my ($self, $cb, $accept, $reject, $skip) = @_;	1451	my ($self, $cb) = @_;
1040		1452
1041	require JSON;	1453	my $json = $self->{json} ||=
		1454	eval { require JSON::XS; JSON::XS->new->utf8 }
		1455	|| do { require JSON; JSON->new->utf8 };
1042		1456
1043	my $data;	1457	my $data;
1044	my $rbuf = \$self->{rbuf};	1458	my $rbuf = \$self->{rbuf};
1045		1459
1046	my $json = $self->{json} ||= JSON->new->utf8;
1047
1048	sub {	1460	sub {
1049	my $ref = $json->incr_parse ($self->{rbuf});	1461	my $ref = eval { $json->incr_parse ($self->{rbuf}) };
1050		1462
1051	if ($ref) {	1463	if ($ref) {
1052	$self->{rbuf} = $json->incr_text;	1464	$self->{rbuf} = $json->incr_text;
1053	$json->incr_text = "";	1465	$json->incr_text = "";
1054	$cb->($self, $ref);	1466	$cb->($self, $ref);
1055		1467
1056	1	1468	1
		1469	} elsif ($@) {
		1470	# error case
		1471	$json->incr_skip;
		1472
		1473	$self->{rbuf} = $json->incr_text;
		1474	$json->incr_text = "";
		1475
		1476	$self->_error (Errno::EBADMSG);
		1477
		1478	()
1057	} else {	1479	} else {
1058	$self->{rbuf} = "";	1480	$self->{rbuf} = "";
		1481
1059	()	1482	()
1060	}	1483	}
		1484	}
		1485	};
		1486
		1487	=item storable => $cb->($handle, $ref)
		1488
		1489	Deserialises a L<Storable> frozen representation as written by the
		1490	C<storable> write type (BER-encoded length prefix followed by nfreeze'd
		1491	data).
		1492
		1493	Raises C<EBADMSG> error if the data could not be decoded.
		1494
		1495	=cut
		1496
		1497	register_read_type storable => sub {
		1498	my ($self, $cb) = @_;
		1499
		1500	require Storable;
		1501
		1502	sub {
		1503	# when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method
		1504	defined (my $len = eval { unpack "w", $_[0]{rbuf} })
		1505	or return;
		1506
		1507	my $format = length pack "w", $len;
		1508
		1509	# bypass unshift if we already have the remaining chunk
		1510	if ($format + $len <= length $_[0]{rbuf}) {
		1511	my $data = substr $_[0]{rbuf}, $format, $len;
		1512	substr $_[0]{rbuf}, 0, $format + $len, "";
		1513	$cb->($_[0], Storable::thaw ($data));
		1514	} else {
		1515	# remove prefix
		1516	substr $_[0]{rbuf}, 0, $format, "";
		1517
		1518	# read remaining chunk
		1519	$_[0]->unshift_read (chunk => $len, sub {
		1520	if (my $ref = eval { Storable::thaw ($_[1]) }) {
		1521	$cb->($_[0], $ref);
		1522	} else {
		1523	$self->_error (Errno::EBADMSG);
		1524	}
		1525	});
		1526	}
		1527
		1528	1
1061	}	1529	}
1062	};	1530	};
1063		1531
1064	=back	1532	=back
1065		1533
…		…
1095	Note that AnyEvent::Handle will automatically C<start_read> for you when	1563	Note that AnyEvent::Handle will automatically C<start_read> for you when
1096	you change the C<on_read> callback or push/unshift a read callback, and it	1564	you change the C<on_read> callback or push/unshift a read callback, and it
1097	will automatically C<stop_read> for you when neither C<on_read> is set nor	1565	will automatically C<stop_read> for you when neither C<on_read> is set nor
1098	there are any read requests in the queue.	1566	there are any read requests in the queue.
1099		1567
		1568	These methods will have no effect when in TLS mode (as TLS doesn't support
		1569	half-duplex connections).
		1570
1100	=cut	1571	=cut
1101		1572
1102	sub stop_read {	1573	sub stop_read {
1103	my ($self) = @_;	1574	my ($self) = @_;
1104		1575
1105	delete $self->{_rw};	1576	delete $self->{_rw} unless $self->{tls};
1106	}	1577	}
1107		1578
1108	sub start_read {	1579	sub start_read {
1109	my ($self) = @_;	1580	my ($self) = @_;
1110		1581
1111	unless ($self->{_rw} || $self->{_eof}) {	1582	unless ($self->{_rw} || $self->{_eof}) {
1112	Scalar::Util::weaken $self;	1583	Scalar::Util::weaken $self;
1113		1584
1114	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {	1585	$self->{_rw} = AE::io $self->{fh}, 0, sub {
1115	my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf};	1586	my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});
1116	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf;	1587	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf;
1117		1588
1118	if ($len > 0) {	1589	if ($len > 0) {
1119	$self->{_activity} = AnyEvent->now;	1590	$self->{_activity} = $self->{_ractivity} = AE::now;
1120		1591
1121	$self->{filter_r}	1592	if ($self->{tls}) {
1122	? $self->{filter_r}($self, $rbuf)	1593	Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);
1123	: $self->{_in_drain} || $self->_drain_rbuf;	1594
		1595	&_dotls ($self);
		1596	} else {
		1597	$self->_drain_rbuf;
		1598	}
1124		1599
1125	} elsif (defined $len) {	1600	} elsif (defined $len) {
1126	delete $self->{_rw};	1601	delete $self->{_rw};
1127	$self->{_eof} = 1;	1602	$self->{_eof} = 1;
1128	$self->_drain_rbuf unless $self->{_in_drain};	1603	$self->_drain_rbuf;
1129		1604
1130	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	1605	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
1131	return $self->_error ($!, 1);	1606	return $self->_error ($!, 1);
1132	}	1607	}
1133	});	1608	};
1134	}	1609	}
1135	}	1610	}
1136		1611
		1612	our $ERROR_SYSCALL;
		1613	our $ERROR_WANT_READ;
		1614
		1615	sub _tls_error {
		1616	my ($self, $err) = @_;
		1617
		1618	return $self->_error ($!, 1)
		1619	if $err == Net::SSLeay::ERROR_SYSCALL ();
		1620
		1621	my $err =Net::SSLeay::ERR_error_string (Net::SSLeay::ERR_get_error ());
		1622
		1623	# reduce error string to look less scary
		1624	$err =~ s/^error:[0-9a-fA-F]{8}:[^:]+:([^:]+):/\L$1: /;
		1625
		1626	if ($self->{_on_starttls}) {
		1627	(delete $self->{_on_starttls})->($self, undef, $err);
		1628	&_freetls;
		1629	} else {
		1630	&_freetls;
		1631	$self->_error (Errno::EPROTO, 1, $err);
		1632	}
		1633	}
		1634
		1635	# poll the write BIO and send the data if applicable
		1636	# also decode read data if possible
		1637	# this is basiclaly our TLS state machine
		1638	# more efficient implementations are possible with openssl,
		1639	# but not with the buggy and incomplete Net::SSLeay.
1137	sub _dotls {	1640	sub _dotls {
1138	my ($self) = @_;	1641	my ($self) = @_;
1139		1642
1140	my $buf;	1643	my $tmp;
1141		1644
1142	if (length $self->{_tls_wbuf}) {	1645	if (length $self->{_tls_wbuf}) {
1143	while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {	1646	while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {
1144	substr $self->{_tls_wbuf}, 0, $len, "";	1647	substr $self->{_tls_wbuf}, 0, $tmp, "";
1145	}	1648	}
1146	}
1147		1649
		1650	$tmp = Net::SSLeay::get_error ($self->{tls}, $tmp);
		1651	return $self->_tls_error ($tmp)
		1652	if $tmp != $ERROR_WANT_READ
		1653	&& ($tmp != $ERROR_SYSCALL || $!);
		1654	}
		1655
		1656	while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) {
		1657	unless (length $tmp) {
		1658	$self->{_on_starttls}
		1659	and (delete $self->{_on_starttls})->($self, undef, "EOF during handshake"); # ???
		1660	&_freetls;
		1661
		1662	if ($self->{on_stoptls}) {
		1663	$self->{on_stoptls}($self);
		1664	return;
		1665	} else {
		1666	# let's treat SSL-eof as we treat normal EOF
		1667	delete $self->{_rw};
		1668	$self->{_eof} = 1;
		1669	}
		1670	}
		1671
		1672	$self->{_tls_rbuf} .= $tmp;
		1673	$self->_drain_rbuf;
		1674	$self->{tls} or return; # tls session might have gone away in callback
		1675	}
		1676
		1677	$tmp = Net::SSLeay::get_error ($self->{tls}, -1);
		1678	return $self->_tls_error ($tmp)
		1679	if $tmp != $ERROR_WANT_READ
		1680	&& ($tmp != $ERROR_SYSCALL || $!);
		1681
1148	if (length ($buf = Net::SSLeay::BIO_read ($self->{_wbio}))) {	1682	while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) {
1149	$self->{wbuf} .= $buf;	1683	$self->{wbuf} .= $tmp;
1150	$self->_drain_wbuf;	1684	$self->_drain_wbuf;
1151	}	1685	}
1152		1686
1153	while (defined ($buf = Net::SSLeay::read ($self->{tls}))) {	1687	$self->{_on_starttls}
1154	if (length $buf) {	1688	and Net::SSLeay::state ($self->{tls}) == Net::SSLeay::ST_OK ()
1155	$self->{rbuf} .= $buf;	1689	and (delete $self->{_on_starttls})->($self, 1, "TLS/SSL connection established");
1156	$self->_drain_rbuf unless $self->{_in_drain};
1157	} else {
1158	# let's treat SSL-eof as we treat normal EOF
1159	$self->{_eof} = 1;
1160	$self->_shutdown;
1161	return;
1162	}
1163	}
1164
1165	my $err = Net::SSLeay::get_error ($self->{tls}, -1);
1166
1167	if ($err!= Net::SSLeay::ERROR_WANT_READ ()) {
1168	if ($err == Net::SSLeay::ERROR_SYSCALL ()) {
1169	return $self->_error ($!, 1);
1170	} elsif ($err == Net::SSLeay::ERROR_SSL ()) {
1171	return $self->_error (&Errno::EIO, 1);
1172	}
1173
1174	# all others are fine for our purposes
1175	}
1176	}	1690	}
1177		1691
1178	=item $handle->starttls ($tls[, $tls_ctx])	1692	=item $handle->starttls ($tls[, $tls_ctx])
1179		1693
1180	Instead of starting TLS negotiation immediately when the AnyEvent::Handle	1694	Instead of starting TLS negotiation immediately when the AnyEvent::Handle
1181	object is created, you can also do that at a later time by calling	1695	object is created, you can also do that at a later time by calling
1182	C<starttls>.	1696	C<starttls>.
1183		1697
		1698	Starting TLS is currently an asynchronous operation - when you push some
		1699	write data and then call C<< ->starttls >> then TLS negotiation will start
		1700	immediately, after which the queued write data is then sent.
		1701
1184	The first argument is the same as the C<tls> constructor argument (either	1702	The first argument is the same as the C<tls> constructor argument (either
1185	C<"connect">, C<"accept"> or an existing Net::SSLeay object).	1703	C<"connect">, C<"accept"> or an existing Net::SSLeay object).
1186		1704
1187	The second argument is the optional C<Net::SSLeay::CTX> object that is	1705	The second argument is the optional C<AnyEvent::TLS> object that is used
1188	used when AnyEvent::Handle has to create its own TLS connection object.	1706	when AnyEvent::Handle has to create its own TLS connection object, or
		1707	a hash reference with C<< key => value >> pairs that will be used to
		1708	construct a new context.
1189		1709
1190	The TLS connection object will end up in C<< $handle->{tls} >> after this	1710	The TLS connection object will end up in C<< $handle->{tls} >>, the TLS
1191	call and can be used or changed to your liking. Note that the handshake	1711	context in C<< $handle->{tls_ctx} >> after this call and can be used or
1192	might have already started when this function returns.	1712	changed to your liking. Note that the handshake might have already started
		1713	when this function returns.
1193		1714
		1715	Due to bugs in OpenSSL, it might or might not be possible to do multiple
		1716	handshakes on the same stream. Best do not attempt to use the stream after
		1717	stopping TLS.
		1718
1194	=cut	1719	=cut
		1720
		1721	our %TLS_CACHE; #TODO not yet documented, should we?
1195		1722
1196	sub starttls {	1723	sub starttls {
1197	my ($self, $ssl, $ctx) = @_;	1724	my ($self, $tls, $ctx) = @_;
1198		1725
1199	$self->stoptls;	1726	Carp::croak "It is an error to call starttls on an AnyEvent::Handle object while TLS is already active, caught"
		1727	if $self->{tls};
1200		1728
1201	if ($ssl eq "accept") {	1729	$self->{tls} = $tls;
1202	$ssl = Net::SSLeay::new ($ctx || TLS_CTX ());	1730	$self->{tls_ctx} = $ctx if @_ > 2;
1203	Net::SSLeay::set_accept_state ($ssl);	1731
1204	} elsif ($ssl eq "connect") {	1732	return unless $self->{fh};
1205	$ssl = Net::SSLeay::new ($ctx || TLS_CTX ());	1733
1206	Net::SSLeay::set_connect_state ($ssl);	1734	require Net::SSLeay;
		1735
		1736	$ERROR_SYSCALL = Net::SSLeay::ERROR_SYSCALL ();
		1737	$ERROR_WANT_READ = Net::SSLeay::ERROR_WANT_READ ();
		1738
		1739	$tls = $self->{tls};
		1740	$ctx = $self->{tls_ctx};
		1741
		1742	local $Carp::CarpLevel = 1; # skip ourselves when creating a new context or session
		1743
		1744	if ("HASH" eq ref $ctx) {
		1745	require AnyEvent::TLS;
		1746
		1747	if ($ctx->{cache}) {
		1748	my $key = $ctx+0;
		1749	$ctx = $TLS_CACHE{$key} ||= new AnyEvent::TLS %$ctx;
		1750	} else {
		1751	$ctx = new AnyEvent::TLS %$ctx;
		1752	}
		1753	}
1207	}	1754
1208		1755	$self->{tls_ctx} = $ctx || TLS_CTX ();
1209	$self->{tls} = $ssl;	1756	$self->{tls} = $tls = $self->{tls_ctx}->_get_session ($tls, $self, $self->{peername});
1210		1757
1211	# basically, this is deep magic (because SSL_read should have the same issues)	1758	# basically, this is deep magic (because SSL_read should have the same issues)
1212	# but the openssl maintainers basically said: "trust us, it just works".	1759	# but the openssl maintainers basically said: "trust us, it just works".
1213	# (unfortunately, we have to hardcode constants because the abysmally misdesigned	1760	# (unfortunately, we have to hardcode constants because the abysmally misdesigned
1214	# and mismaintained ssleay-module doesn't even offer them).	1761	# and mismaintained ssleay-module doesn't even offer them).
1215	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html	1762	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html
		1763	#
		1764	# in short: this is a mess.
		1765	#
		1766	# note that we do not try to keep the length constant between writes as we are required to do.
		1767	# we assume that most (but not all) of this insanity only applies to non-blocking cases,
		1768	# and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to
		1769	# have identity issues in that area.
1216	Net::SSLeay::CTX_set_mode ($self->{tls},	1770	# Net::SSLeay::CTX_set_mode ($ssl,
1217	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1)	1771	# (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1)
1218	| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2));	1772	# | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2));
		1773	Net::SSLeay::CTX_set_mode ($tls, 1|2);
1219		1774
1220	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1775	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1221	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1776	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1222		1777
		1778	Net::SSLeay::BIO_write ($self->{_rbio}, delete $self->{rbuf});
		1779
1223	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});	1780	Net::SSLeay::set_bio ($tls, $self->{_rbio}, $self->{_wbio});
1224		1781
1225	$self->{filter_w} = sub {	1782	$self->{_on_starttls} = sub { $_[0]{on_starttls}(@_) }
1226	$_[0]{_tls_wbuf} .= ${$_[1]};	1783	if $self->{on_starttls};
1227	&_dotls;	1784
1228	};	1785	&_dotls; # need to trigger the initial handshake
1229	$self->{filter_r} = sub {	1786	$self->start_read; # make sure we actually do read
1230	Net::SSLeay::BIO_write ($_[0]{_rbio}, ${$_[1]});
1231	&_dotls;
1232	};
1233	}	1787	}
1234		1788
1235	=item $handle->stoptls	1789	=item $handle->stoptls
1236		1790
1237	Destroys the SSL connection, if any. Partial read or write data will be	1791	Shuts down the SSL connection - this makes a proper EOF handshake by
1238	lost.	1792	sending a close notify to the other side, but since OpenSSL doesn't
		1793	support non-blocking shut downs, it is not guarenteed that you can re-use
		1794	the stream afterwards.
1239		1795
1240	=cut	1796	=cut
1241		1797
1242	sub stoptls {	1798	sub stoptls {
1243	my ($self) = @_;	1799	my ($self) = @_;
1244		1800
1245	Net::SSLeay::free (delete $self->{tls}) if $self->{tls};	1801	if ($self->{tls}) {
		1802	Net::SSLeay::shutdown ($self->{tls});
1246		1803
1247	delete $self->{_rbio};	1804	&_dotls;
1248	delete $self->{_wbio};	1805
1249	delete $self->{_tls_wbuf};	1806	# # we don't give a shit. no, we do, but we can't. no...#d#
1250	delete $self->{filter_r};	1807	# # we, we... have to use openssl :/#d#
1251	delete $self->{filter_w};	1808	# &_freetls;#d#
		1809	}
		1810	}
		1811
		1812	sub _freetls {
		1813	my ($self) = @_;
		1814
		1815	return unless $self->{tls};
		1816
		1817	$self->{tls_ctx}->_put_session (delete $self->{tls})
		1818	if $self->{tls} > 0;
		1819
		1820	delete @$self{qw(_rbio _wbio _tls_wbuf _on_starttls)};
1252	}	1821	}
1253		1822
1254	sub DESTROY {	1823	sub DESTROY {
1255	my $self = shift;	1824	my ($self) = @_;
1256		1825
1257	$self->stoptls;	1826	&_freetls;
		1827
		1828	my $linger = exists $self->{linger} ? $self->{linger} : 3600;
		1829
		1830	if ($linger && length $self->{wbuf} && $self->{fh}) {
		1831	my $fh = delete $self->{fh};
		1832	my $wbuf = delete $self->{wbuf};
		1833
		1834	my @linger;
		1835
		1836	push @linger, AE::io $fh, 1, sub {
		1837	my $len = syswrite $fh, $wbuf, length $wbuf;
		1838
		1839	if ($len > 0) {
		1840	substr $wbuf, 0, $len, "";
		1841	} else {
		1842	@linger = (); # end
		1843	}
		1844	};
		1845	push @linger, AE::timer $linger, 0, sub {
		1846	@linger = ();
		1847	};
		1848	}
		1849	}
		1850
		1851	=item $handle->destroy
		1852
		1853	Shuts down the handle object as much as possible - this call ensures that
		1854	no further callbacks will be invoked and as many resources as possible
		1855	will be freed. Any method you will call on the handle object after
		1856	destroying it in this way will be silently ignored (and it will return the
		1857	empty list).
		1858
		1859	Normally, you can just "forget" any references to an AnyEvent::Handle
		1860	object and it will simply shut down. This works in fatal error and EOF
		1861	callbacks, as well as code outside. It does I<NOT> work in a read or write
		1862	callback, so when you want to destroy the AnyEvent::Handle object from
		1863	within such an callback. You I<MUST> call C<< ->destroy >> explicitly in
		1864	that case.
		1865
		1866	Destroying the handle object in this way has the advantage that callbacks
		1867	will be removed as well, so if those are the only reference holders (as
		1868	is common), then one doesn't need to do anything special to break any
		1869	reference cycles.
		1870
		1871	The handle might still linger in the background and write out remaining
		1872	data, as specified by the C<linger> option, however.
		1873
		1874	=cut
		1875
		1876	sub destroy {
		1877	my ($self) = @_;
		1878
		1879	$self->DESTROY;
		1880	%$self = ();
		1881	bless $self, "AnyEvent::Handle::destroyed";
		1882	}
		1883
		1884	sub AnyEvent::Handle::destroyed::AUTOLOAD {
		1885	#nop
1258	}	1886	}
1259		1887
1260	=item AnyEvent::Handle::TLS_CTX	1888	=item AnyEvent::Handle::TLS_CTX
1261		1889
1262	This function creates and returns the Net::SSLeay::CTX object used by	1890	This function creates and returns the AnyEvent::TLS object used by default
1263	default for TLS mode.	1891	for TLS mode.
1264		1892
1265	The context is created like this:	1893	The context is created by calling L<AnyEvent::TLS> without any arguments.
1266
1267	Net::SSLeay::load_error_strings;
1268	Net::SSLeay::SSLeay_add_ssl_algorithms;
1269	Net::SSLeay::randomize;
1270
1271	my $CTX = Net::SSLeay::CTX_new;
1272
1273	Net::SSLeay::CTX_set_options $CTX, Net::SSLeay::OP_ALL
1274		1894
1275	=cut	1895	=cut
1276		1896
1277	our $TLS_CTX;	1897	our $TLS_CTX;
1278		1898
1279	sub TLS_CTX() {	1899	sub TLS_CTX() {
1280	$TLS_CTX || do {	1900	$TLS_CTX ||= do {
1281	require Net::SSLeay;	1901	require AnyEvent::TLS;
1282		1902
1283	Net::SSLeay::load_error_strings ();	1903	new AnyEvent::TLS
1284	Net::SSLeay::SSLeay_add_ssl_algorithms ();
1285	Net::SSLeay::randomize ();
1286
1287	$TLS_CTX = Net::SSLeay::CTX_new ();
1288
1289	Net::SSLeay::CTX_set_options ($TLS_CTX, Net::SSLeay::OP_ALL ());
1290
1291	$TLS_CTX
1292	}	1904	}
1293	}	1905	}
1294		1906
1295	=back	1907	=back
		1908
		1909
		1910	=head1 NONFREQUENTLY ASKED QUESTIONS
		1911
		1912	=over 4
		1913
		1914	=item I C<undef> the AnyEvent::Handle reference inside my callback and
		1915	still get further invocations!
		1916
		1917	That's because AnyEvent::Handle keeps a reference to itself when handling
		1918	read or write callbacks.
		1919
		1920	It is only safe to "forget" the reference inside EOF or error callbacks,
		1921	from within all other callbacks, you need to explicitly call the C<<
		1922	->destroy >> method.
		1923
		1924	=item I get different callback invocations in TLS mode/Why can't I pause
		1925	reading?
		1926
		1927	Unlike, say, TCP, TLS connections do not consist of two independent
		1928	communication channels, one for each direction. Or put differently. The
		1929	read and write directions are not independent of each other: you cannot
		1930	write data unless you are also prepared to read, and vice versa.
		1931
		1932	This can mean than, in TLS mode, you might get C<on_error> or C<on_eof>
		1933	callback invocations when you are not expecting any read data - the reason
		1934	is that AnyEvent::Handle always reads in TLS mode.
		1935
		1936	During the connection, you have to make sure that you always have a
		1937	non-empty read-queue, or an C<on_read> watcher. At the end of the
		1938	connection (or when you no longer want to use it) you can call the
		1939	C<destroy> method.
		1940
		1941	=item How do I read data until the other side closes the connection?
		1942
		1943	If you just want to read your data into a perl scalar, the easiest way
		1944	to achieve this is by setting an C<on_read> callback that does nothing,
		1945	clearing the C<on_eof> callback and in the C<on_error> callback, the data
		1946	will be in C<$_[0]{rbuf}>:
		1947
		1948	$handle->on_read (sub { });
		1949	$handle->on_eof (undef);
		1950	$handle->on_error (sub {
		1951	my $data = delete $_[0]{rbuf};
		1952	});
		1953
		1954	The reason to use C<on_error> is that TCP connections, due to latencies
		1955	and packets loss, might get closed quite violently with an error, when in
		1956	fact, all data has been received.
		1957
		1958	It is usually better to use acknowledgements when transferring data,
		1959	to make sure the other side hasn't just died and you got the data
		1960	intact. This is also one reason why so many internet protocols have an
		1961	explicit QUIT command.
		1962
		1963	=item I don't want to destroy the handle too early - how do I wait until
		1964	all data has been written?
		1965
		1966	After writing your last bits of data, set the C<on_drain> callback
		1967	and destroy the handle in there - with the default setting of
		1968	C<low_water_mark> this will be called precisely when all data has been
		1969	written to the socket:
		1970
		1971	$handle->push_write (...);
		1972	$handle->on_drain (sub {
		1973	warn "all data submitted to the kernel\n";
		1974	undef $handle;
		1975	});
		1976
		1977	If you just want to queue some data and then signal EOF to the other side,
		1978	consider using C<< ->push_shutdown >> instead.
		1979
		1980	=item I want to contact a TLS/SSL server, I don't care about security.
		1981
		1982	If your TLS server is a pure TLS server (e.g. HTTPS) that only speaks TLS,
		1983	simply connect to it and then create the AnyEvent::Handle with the C<tls>
		1984	parameter:
		1985
		1986	tcp_connect $host, $port, sub {
		1987	my ($fh) = @_;
		1988
		1989	my $handle = new AnyEvent::Handle
		1990	fh => $fh,
		1991	tls => "connect",
		1992	on_error => sub { ... };
		1993
		1994	$handle->push_write (...);
		1995	};
		1996
		1997	=item I want to contact a TLS/SSL server, I do care about security.
		1998
		1999	Then you should additionally enable certificate verification, including
		2000	peername verification, if the protocol you use supports it (see
		2001	L<AnyEvent::TLS>, C<verify_peername>).
		2002
		2003	E.g. for HTTPS:
		2004
		2005	tcp_connect $host, $port, sub {
		2006	my ($fh) = @_;
		2007
		2008	my $handle = new AnyEvent::Handle
		2009	fh => $fh,
		2010	peername => $host,
		2011	tls => "connect",
		2012	tls_ctx => { verify => 1, verify_peername => "https" },
		2013	...
		2014
		2015	Note that you must specify the hostname you connected to (or whatever
		2016	"peername" the protocol needs) as the C<peername> argument, otherwise no
		2017	peername verification will be done.
		2018
		2019	The above will use the system-dependent default set of trusted CA
		2020	certificates. If you want to check against a specific CA, add the
		2021	C<ca_file> (or C<ca_cert>) arguments to C<tls_ctx>:
		2022
		2023	tls_ctx => {
		2024	verify => 1,
		2025	verify_peername => "https",
		2026	ca_file => "my-ca-cert.pem",
		2027	},
		2028
		2029	=item I want to create a TLS/SSL server, how do I do that?
		2030
		2031	Well, you first need to get a server certificate and key. You have
		2032	three options: a) ask a CA (buy one, use cacert.org etc.) b) create a
		2033	self-signed certificate (cheap. check the search engine of your choice,
		2034	there are many tutorials on the net) or c) make your own CA (tinyca2 is a
		2035	nice program for that purpose).
		2036
		2037	Then create a file with your private key (in PEM format, see
		2038	L<AnyEvent::TLS>), followed by the certificate (also in PEM format). The
		2039	file should then look like this:
		2040
		2041	-----BEGIN RSA PRIVATE KEY-----
		2042	...header data
		2043	... lots of base64'y-stuff
		2044	-----END RSA PRIVATE KEY-----
		2045
		2046	-----BEGIN CERTIFICATE-----
		2047	... lots of base64'y-stuff
		2048	-----END CERTIFICATE-----
		2049
		2050	The important bits are the "PRIVATE KEY" and "CERTIFICATE" parts. Then
		2051	specify this file as C<cert_file>:
		2052
		2053	tcp_server undef, $port, sub {
		2054	my ($fh) = @_;
		2055
		2056	my $handle = new AnyEvent::Handle
		2057	fh => $fh,
		2058	tls => "accept",
		2059	tls_ctx => { cert_file => "my-server-keycert.pem" },
		2060	...
		2061
		2062	When you have intermediate CA certificates that your clients might not
		2063	know about, just append them to the C<cert_file>.
		2064
		2065	=back
		2066
1296		2067
1297	=head1 SUBCLASSING AnyEvent::Handle	2068	=head1 SUBCLASSING AnyEvent::Handle
1298		2069
1299	In many cases, you might want to subclass AnyEvent::Handle.	2070	In many cases, you might want to subclass AnyEvent::Handle.
1300		2071
…		…
1304	=over 4	2075	=over 4
1305		2076
1306	=item * all constructor arguments become object members.	2077	=item * all constructor arguments become object members.
1307		2078
1308	At least initially, when you pass a C<tls>-argument to the constructor it	2079	At least initially, when you pass a C<tls>-argument to the constructor it
1309	will end up in C<< $handle->{tls} >>. Those members might be changes or	2080	will end up in C<< $handle->{tls} >>. Those members might be changed or
1310	mutated later on (for example C<tls> will hold the TLS connection object).	2081	mutated later on (for example C<tls> will hold the TLS connection object).
1311		2082
1312	=item * other object member names are prefixed with an C<_>.	2083	=item * other object member names are prefixed with an C<_>.
1313		2084
1314	All object members not explicitly documented (internal use) are prefixed	2085	All object members not explicitly documented (internal use) are prefixed

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