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

Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.39 by root, Tue May 27 04:59:51 2008 UTC vs.
Revision 1.47 by root, Thu May 29 00:25:28 2008 UTC

…		…
2		2
3	no warnings;	3	no warnings;
4	use strict;	4	use strict;
5		5
6	use AnyEvent ();	6	use AnyEvent ();
7	use AnyEvent::Util qw(WSAWOULDBLOCK);	7	use AnyEvent::Util qw(WSAEWOULDBLOCK);
8	use Scalar::Util ();	8	use Scalar::Util ();
9	use Carp ();	9	use Carp ();
10	use Fcntl ();	10	use Fcntl ();
11	use Errno qw/EAGAIN EINTR/;	11	use Errno qw(EAGAIN EINTR);
12		12
13	=head1 NAME	13	=head1 NAME
14		14
15	AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent	15	AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent
16		16
…		…
73	The filehandle this L<AnyEvent::Handle> object will operate on.	73	The filehandle this L<AnyEvent::Handle> object will operate on.
74		74
75	NOTE: The filehandle will be set to non-blocking (using	75	NOTE: The filehandle will be set to non-blocking (using
76	AnyEvent::Util::fh_nonblocking).	76	AnyEvent::Util::fh_nonblocking).
77		77
78	=item on_eof => $cb->($self)	78	=item on_eof => $cb->($handle)
79		79
80	Set the callback to be called on EOF.	80	Set the callback to be called on EOF.
81		81
82	While not mandatory, it is highly recommended to set an eof callback,	82	While not mandatory, it is highly recommended to set an eof callback,
83	otherwise you might end up with a closed socket while you are still	83	otherwise you might end up with a closed socket while you are still
84	waiting for data.	84	waiting for data.
85		85
86	=item on_error => $cb->($self)	86	=item on_error => $cb->($handle)
87		87
88	This is the fatal error callback, that is called when, well, a fatal error	88	This is the fatal error callback, that is called when, well, a fatal error
89	occurs, such as not being able to resolve the hostname, failure to connect	89	occurs, such as not being able to resolve the hostname, failure to connect
90	or a read error.	90	or a read error.
91		91
92	The object will not be in a usable state when this callback has been	92	The object will not be in a usable state when this callback has been
93	called.	93	called.
94		94
95	On callback entrance, the value of C<$!> contains the operating system	95	On callback entrance, the value of C<$!> contains the operating system
96	error (or C<ENOSPC>, C<EPIPE> or C<EBADMSG>).	96	error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>).
97		97
98	The callback should throw an exception. If it returns, then	98	The callback should throw an exception. If it returns, then
99	AnyEvent::Handle will C<croak> for you.	99	AnyEvent::Handle will C<croak> for you.
100		100
101	While not mandatory, it is I<highly> recommended to set this callback, as	101	While not mandatory, it is I<highly> recommended to set this callback, as
102	you will not be notified of errors otherwise. The default simply calls	102	you will not be notified of errors otherwise. The default simply calls
103	die.	103	die.
104		104
105	=item on_read => $cb->($self)	105	=item on_read => $cb->($handle)
106		106
107	This sets the default read callback, which is called when data arrives	107	This sets the default read callback, which is called when data arrives
108	and no read request is in the queue.	108	and no read request is in the queue.
109		109
110	To access (and remove data from) the read buffer, use the C<< ->rbuf >>	110	To access (and remove data from) the read buffer, use the C<< ->rbuf >>
111	method or access the C<$self->{rbuf}> member directly.	111	method or access the C<$handle->{rbuf}> member directly.
112		112
113	When an EOF condition is detected then AnyEvent::Handle will first try to	113	When an EOF condition is detected then AnyEvent::Handle will first try to
114	feed all the remaining data to the queued callbacks and C<on_read> before	114	feed all the remaining data to the queued callbacks and C<on_read> before
115	calling the C<on_eof> callback. If no progress can be made, then a fatal	115	calling the C<on_eof> callback. If no progress can be made, then a fatal
116	error will be raised (with C<$!> set to C<EPIPE>).	116	error will be raised (with C<$!> set to C<EPIPE>).
117		117
118	=item on_drain => $cb->()	118	=item on_drain => $cb->($handle)
119		119
120	This sets the callback that is called when the write buffer becomes empty	120	This sets the callback that is called when the write buffer becomes empty
121	(or when the callback is set and the buffer is empty already).	121	(or when the callback is set and the buffer is empty already).
122		122
123	To append to the write buffer, use the C<< ->push_write >> method.	123	To append to the write buffer, use the C<< ->push_write >> method.
		124
		125	=item timeout => $fractional_seconds
		126
		127	If non-zero, then this enables an "inactivity" timeout: whenever this many
		128	seconds pass without a successful read or write on the underlying file
		129	handle, the C<on_timeout> callback will be invoked (and if that one is
		130	missing, an C<ETIMEDOUT> error will be raised).
		131
		132	Note that timeout processing is also active when you currently do not have
		133	any outstanding read or write requests: If you plan to keep the connection
		134	idle then you should disable the timout temporarily or ignore the timeout
		135	in the C<on_timeout> callback.
		136
		137	Zero (the default) disables this timeout.
		138
		139	=item on_timeout => $cb->($handle)
		140
		141	Called whenever the inactivity timeout passes. If you return from this
		142	callback, then the timeout will be reset as if some activity had happened,
		143	so this condition is not fatal in any way.
124		144
125	=item rbuf_max => <bytes>	145	=item rbuf_max => <bytes>
126		146
127	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)	147	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)
128	when the read buffer ever (strictly) exceeds this size. This is useful to	148	when the read buffer ever (strictly) exceeds this size. This is useful to
…		…
135	isn't finished).	155	isn't finished).
136		156
137	=item read_size => <bytes>	157	=item read_size => <bytes>
138		158
139	The default read block size (the amount of bytes this module will try to read	159	The default read block size (the amount of bytes this module will try to read
140	on each [loop iteration). Default: C<4096>.	160	during each (loop iteration). Default: C<8192>.
141		161
142	=item low_water_mark => <bytes>	162	=item low_water_mark => <bytes>
143		163
144	Sets the amount of bytes (default: C<0>) that make up an "empty" write	164	Sets the amount of bytes (default: C<0>) that make up an "empty" write
145	buffer: If the write reaches this size or gets even samller it is	165	buffer: If the write reaches this size or gets even samller it is
…		…
168		188
169	Use the given Net::SSLeay::CTX object to create the new TLS connection	189	Use the given Net::SSLeay::CTX object to create the new TLS connection
170	(unless a connection object was specified directly). If this parameter is	190	(unless a connection object was specified directly). If this parameter is
171	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.	191	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.
172		192
		193	=item json => JSON or JSON::XS object
		194
		195	This is the json coder object used by the C<json> read and write types.
		196
		197	If you don't supply it, then AnyEvent::Handle will create and use a
		198	suitable one, which will write and expect UTF-8 encoded JSON texts.
		199
		200	Note that you are responsible to depend on the JSON module if you want to
		201	use this functionality, as AnyEvent does not have a dependency itself.
		202
173	=item filter_r => $cb	203	=item filter_r => $cb
174		204
175	=item filter_w => $cb	205	=item filter_w => $cb
176		206
177	These exist, but are undocumented at this time.	207	These exist, but are undocumented at this time.
…		…
192	if ($self->{tls}) {	222	if ($self->{tls}) {
193	require Net::SSLeay;	223	require Net::SSLeay;
194	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx});	224	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx});
195	}	225	}
196		226
197	$self->on_eof (delete $self->{on_eof} ) if $self->{on_eof};	227	# $self->on_eof (delete $self->{on_eof} ) if $self->{on_eof}; # nop
198	$self->on_error (delete $self->{on_error}) if $self->{on_error};	228	# $self->on_error (delete $self->{on_error}) if $self->{on_error}; # nop
		229	# $self->on_read (delete $self->{on_read} ) if $self->{on_read}; # nop
199	$self->on_drain (delete $self->{on_drain}) if $self->{on_drain};	230	$self->on_drain (delete $self->{on_drain}) if $self->{on_drain};
200	$self->on_read (delete $self->{on_read} ) if $self->{on_read};	231
		232	$self->{_activity} = AnyEvent->now;
		233	$self->_timeout;
201		234
202	$self->start_read;	235	$self->start_read;
203		236
204	$self	237	$self
205	}	238	}
206		239
207	sub _shutdown {	240	sub _shutdown {
208	my ($self) = @_;	241	my ($self) = @_;
209		242
		243	delete $self->{_tw};
210	delete $self->{_rw};	244	delete $self->{_rw};
211	delete $self->{_ww};	245	delete $self->{_ww};
212	delete $self->{fh};	246	delete $self->{fh};
213	}	247	}
214		248
…		…
252		286
253	sub on_eof {	287	sub on_eof {
254	$_[0]{on_eof} = $_[1];	288	$_[0]{on_eof} = $_[1];
255	}	289	}
256		290
		291	=item $handle->on_timeout ($cb)
		292
		293	Replace the current C<on_timeout> callback, or disables the callback
		294	(but not the timeout) if C<$cb> = C<undef>. See C<timeout> constructor
		295	argument.
		296
		297	=cut
		298
		299	sub on_timeout {
		300	$_[0]{on_timeout} = $_[1];
		301	}
		302
		303	#############################################################################
		304
		305	=item $handle->timeout ($seconds)
		306
		307	Configures (or disables) the inactivity timeout.
		308
		309	=cut
		310
		311	sub timeout {
		312	my ($self, $timeout) = @_;
		313
		314	$self->{timeout} = $timeout;
		315	$self->_timeout;
		316	}
		317
		318	# reset the timeout watcher, as neccessary
		319	# also check for time-outs
		320	sub _timeout {
		321	my ($self) = @_;
		322
		323	if ($self->{timeout}) {
		324	my $NOW = AnyEvent->now;
		325
		326	# when would the timeout trigger?
		327	my $after = $self->{_activity} + $self->{timeout} - $NOW;
		328
		329	# now or in the past already?
		330	if ($after <= 0) {
		331	$self->{_activity} = $NOW;
		332
		333	if ($self->{on_timeout}) {
		334	$self->{on_timeout}->($self);
		335	} else {
		336	$! = Errno::ETIMEDOUT;
		337	$self->error;
		338	}
		339
		340	# callbakx could have changed timeout value, optimise
		341	return unless $self->{timeout};
		342
		343	# calculate new after
		344	$after = $self->{timeout};
		345	}
		346
		347	Scalar::Util::weaken $self;
		348
		349	$self->{_tw} \|\|= AnyEvent->timer (after => $after, cb => sub {
		350	delete $self->{_tw};
		351	$self->_timeout;
		352	});
		353	} else {
		354	delete $self->{_tw};
		355	}
		356	}
		357
257	#############################################################################	358	#############################################################################
258		359
259	=back	360	=back
260		361
261	=head2 WRITE QUEUE	362	=head2 WRITE QUEUE
…		…
306	my $len = syswrite $self->{fh}, $self->{wbuf};	407	my $len = syswrite $self->{fh}, $self->{wbuf};
307		408
308	if ($len >= 0) {	409	if ($len >= 0) {
309	substr $self->{wbuf}, 0, $len, "";	410	substr $self->{wbuf}, 0, $len, "";
310		411
		412	$self->{_activity} = AnyEvent->now;
		413
311	$self->{on_drain}($self)	414	$self->{on_drain}($self)
312	if $self->{low_water_mark} >= length $self->{wbuf}	415	if $self->{low_water_mark} >= length $self->{wbuf}
313	&& $self->{on_drain};	416	&& $self->{on_drain};
314		417
315	delete $self->{_ww} unless length $self->{wbuf};	418	delete $self->{_ww} unless length $self->{wbuf};
316	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAWOULDBLOCK) {	419	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
317	$self->error;	420	$self->error;
318	}	421	}
319	};	422	};
320		423
321	# try to write data immediately	424	# try to write data immediately
…		…
378	sprintf "%d:%s,", (length $string), $string	481	sprintf "%d:%s,", (length $string), $string
379	};	482	};
380		483
381	=item json => $array_or_hashref	484	=item json => $array_or_hashref
382		485
		486	Encodes the given hash or array reference into a JSON object. Unless you
		487	provide your own JSON object, this means it will be encoded to JSON text
		488	in UTF-8.
		489
		490	JSON objects (and arrays) are self-delimiting, so you can write JSON at
		491	one end of a handle and read them at the other end without using any
		492	additional framing.
		493
		494	The generated JSON text is guaranteed not to contain any newlines: While
		495	this module doesn't need delimiters after or between JSON texts to be
		496	able to read them, many other languages depend on that.
		497
		498	A simple RPC protocol that interoperates easily with others is to send
		499	JSON arrays (or objects, although arrays are usually the better choice as
		500	they mimic how function argument passing works) and a newline after each
		501	JSON text:
		502
		503	$handle->push_write (json => ["method", "arg1", "arg2"]); # whatever
		504	$handle->push_write ("\012");
		505
		506	An AnyEvent::Handle receiver would simply use the C<json> read type and
		507	rely on the fact that the newline will be skipped as leading whitespace:
		508
		509	$handle->push_read (json => sub { my $array = $_[1]; ... });
		510
		511	Other languages could read single lines terminated by a newline and pass
		512	this line into their JSON decoder of choice.
		513
		514	=cut
		515
		516	register_write_type json => sub {
		517	my ($self, $ref) = @_;
		518
		519	require JSON;
		520
		521	$self->{json} ? $self->{json}->encode ($ref)
		522	: JSON::encode_json ($ref)
		523	};
		524
383	=item AnyEvent::Handle::register_write_type type => $coderef->($self, @args)	525	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)
384		526
385	This function (not method) lets you add your own types to C<push_write>.	527	This function (not method) lets you add your own types to C<push_write>.
386	Whenever the given C<type> is used, C<push_write> will invoke the code	528	Whenever the given C<type> is used, C<push_write> will invoke the code
387	reference with the handle object and the remaining arguments.	529	reference with the handle object and the remaining arguments.
388		530
…		…
628	Predefined types are (if you have ideas for additional types, feel free to	770	Predefined types are (if you have ideas for additional types, feel free to
629	drop by and tell us):	771	drop by and tell us):
630		772
631	=over 4	773	=over 4
632		774
633	=item chunk => $octets, $cb->($self, $data)	775	=item chunk => $octets, $cb->($handle, $data)
634		776
635	Invoke the callback only once C<$octets> bytes have been read. Pass the	777	Invoke the callback only once C<$octets> bytes have been read. Pass the
636	data read to the callback. The callback will never be called with less	778	data read to the callback. The callback will never be called with less
637	data.	779	data.
638		780
…		…
661		803
662	sub unshift_read_chunk {	804	sub unshift_read_chunk {
663	$_[0]->unshift_read (chunk => $_[1], $_[2]);	805	$_[0]->unshift_read (chunk => $_[1], $_[2]);
664	}	806	}
665		807
666	=item line => [$eol, ]$cb->($self, $line, $eol)	808	=item line => [$eol, ]$cb->($handle, $line, $eol)
667		809
668	The callback will be called only once a full line (including the end of	810	The callback will be called only once a full line (including the end of
669	line marker, C<$eol>) has been read. This line (excluding the end of line	811	line marker, C<$eol>) has been read. This line (excluding the end of line
670	marker) will be passed to the callback as second argument (C<$line>), and	812	marker) will be passed to the callback as second argument (C<$line>), and
671	the end of line marker as the third argument (C<$eol>).	813	the end of line marker as the third argument (C<$eol>).
…		…
708	sub unshift_read_line {	850	sub unshift_read_line {
709	my $self = shift;	851	my $self = shift;
710	$self->unshift_read (line => @_);	852	$self->unshift_read (line => @_);
711	}	853	}
712		854
713	=item netstring => $cb->($string)	855	=item netstring => $cb->($handle, $string)
714		856
715	A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement).	857	A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement).
716		858
717	Throws an error with C<$!> set to EBADMSG on format violations.	859	Throws an error with C<$!> set to EBADMSG on format violations.
718		860
…		…
746		888
747	1	889	1
748	}	890	}
749	};	891	};
750		892
751	=item regex => $accept[, $reject[, $skip], $cb->($data)	893	=item regex => $accept[, $reject[, $skip], $cb->($handle, $data)
752		894
753	Makes a regex match against the regex object C<$accept> and returns	895	Makes a regex match against the regex object C<$accept> and returns
754	everything up to and including the match.	896	everything up to and including the match.
755		897
756	Example: read a single line terminated by '\n'.	898	Example: read a single line terminated by '\n'.
…		…
817		959
818	()	960	()
819	}	961	}
820	};	962	};
821		963
		964	=item json => $cb->($handle, $hash_or_arrayref)
		965
		966	Reads a JSON object or array, decodes it and passes it to the callback.
		967
		968	If a C<json> object was passed to the constructor, then that will be used
		969	for the final decode, otherwise it will create a JSON coder expecting UTF-8.
		970
		971	This read type uses the incremental parser available with JSON version
		972	2.09 (and JSON::XS version 2.2) and above. You have to provide a
		973	dependency on your own: this module will load the JSON module, but
		974	AnyEvent does not depend on it itself.
		975
		976	Since JSON texts are fully self-delimiting, the C<json> read and write
		977	types are an ideal simple RPC protocol: just exchange JSON datagrams. See
		978	the C<json> write type description, above, for an actual example.
		979
		980	=cut
		981
		982	register_read_type json => sub {
		983	my ($self, $cb, $accept, $reject, $skip) = @_;
		984
		985	require JSON;
		986
		987	my $data;
		988	my $rbuf = \$self->{rbuf};
		989
		990	my $json = $self->{json} \|\|= JSON->new->utf8;
		991
		992	sub {
		993	my $ref = $json->incr_parse ($self->{rbuf});
		994
		995	if ($ref) {
		996	$self->{rbuf} = $json->incr_text;
		997	$json->incr_text = "";
		998	$cb->($self, $ref);
		999
		1000	1
		1001	} else {
		1002	$self->{rbuf} = "";
		1003	()
		1004	}
		1005	}
		1006	};
		1007
822	=back	1008	=back
823		1009
824	=item AnyEvent::Handle::register_read_type type => $coderef->($self, $cb, @args)	1010	=item AnyEvent::Handle::register_read_type type => $coderef->($handle, $cb, @args)
825		1011
826	This function (not method) lets you add your own types to C<push_read>.	1012	This function (not method) lets you add your own types to C<push_read>.
827		1013
828	Whenever the given C<type> is used, C<push_read> will invoke the code	1014	Whenever the given C<type> is used, C<push_read> will invoke the code
829	reference with the handle object, the callback and the remaining	1015	reference with the handle object, the callback and the remaining
…		…
831		1017
832	The code reference is supposed to return a callback (usually a closure)	1018	The code reference is supposed to return a callback (usually a closure)
833	that works as a plain read callback (see C<< ->push_read ($cb) >>).	1019	that works as a plain read callback (see C<< ->push_read ($cb) >>).
834		1020
835	It should invoke the passed callback when it is done reading (remember to	1021	It should invoke the passed callback when it is done reading (remember to
836	pass C<$self> as first argument as all other callbacks do that).	1022	pass C<$handle> as first argument as all other callbacks do that).
837		1023
838	Note that this is a function, and all types registered this way will be	1024	Note that this is a function, and all types registered this way will be
839	global, so try to use unique names.	1025	global, so try to use unique names.
840		1026
841	For examples, see the source of this module (F<perldoc -m AnyEvent::Handle>,	1027	For examples, see the source of this module (F<perldoc -m AnyEvent::Handle>,
…		…
867	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {	1053	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {
868	my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf};	1054	my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf};
869	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} \|\| 8192, length $$rbuf;	1055	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} \|\| 8192, length $$rbuf;
870		1056
871	if ($len > 0) {	1057	if ($len > 0) {
		1058	$self->{_activity} = AnyEvent->now;
		1059
872	$self->{filter_r}	1060	$self->{filter_r}
873	? $self->{filter_r}->($self, $rbuf)	1061	? $self->{filter_r}->($self, $rbuf)
874	: $self->_drain_rbuf;	1062	: $self->_drain_rbuf;
875		1063
876	} elsif (defined $len) {	1064	} elsif (defined $len) {
877	delete $self->{_rw};	1065	delete $self->{_rw};
878	$self->{_eof} = 1;	1066	$self->{_eof} = 1;
879	$self->_drain_rbuf;	1067	$self->_drain_rbuf;
880		1068
881	} elsif ($! != EAGAIN && $! != EINTR && $! != &AnyEvent::Util::WSAWOULDBLOCK) {	1069	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
882	return $self->error;	1070	return $self->error;
883	}	1071	}
884	});	1072	});
885	}	1073	}
886	}	1074	}

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Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents): Revision 1.39 by root, Tue May 27 04:59:51 2008 UTC vs. Revision 1.47 by root, Thu May 29 00:25:28 2008 UTC

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Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.39 by root, Tue May 27 04:59:51 2008 UTC vs.
Revision 1.47 by root, Thu May 29 00:25:28 2008 UTC