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Revision 1.180 by root, Thu Aug 20 22:58:35 2009 UTC vs.
Revision 1.204 by root, Mon Nov 15 03:29:17 2010 UTC

1=head1 NAME 1=head1 NAME
2 2
3AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent 3AnyEvent::Handle - non-blocking I/O on streaming handles via AnyEvent
4 4
5=head1 SYNOPSIS 5=head1 SYNOPSIS
6 6
7 use AnyEvent; 7 use AnyEvent;
8 use AnyEvent::Handle; 8 use AnyEvent::Handle;
… …
14 on_error => sub { 14 on_error => sub {
15 my ($hdl, $fatal, $msg) = @_; 15 my ($hdl, $fatal, $msg) = @_;
16 warn "got error $msg\n"; 16 warn "got error $msg\n";
17 $hdl->destroy; 17 $hdl->destroy;
18 $cv->send; 18 $cv->send;
19 ); 19 };
20 20
21 # send some request line 21 # send some request line
22 $hdl->push_write ("getinfo\015\012"); 22 $hdl->push_write ("getinfo\015\012");
23 23
24 # read the response line 24 # read the response line
… …
30 30
31 $cv->recv; 31 $cv->recv;
32 32
33=head1 DESCRIPTION 33=head1 DESCRIPTION
34 34
35This module is a helper module to make it easier to do event-based I/O on 35This is a helper module to make it easier to do event-based I/O on
36filehandles. 36stream-based filehandles (sockets, pipes, and other stream things).
37 37
38The L<AnyEvent::Intro> tutorial contains some well-documented 38The L<AnyEvent::Intro> tutorial contains some well-documented
39AnyEvent::Handle examples. 39AnyEvent::Handle examples.
40 40
41In the following, when the documentation refers to of "bytes" then this 41In the following, where the documentation refers to "bytes", it means
42means characters. As sysread and syswrite are used for all I/O, their 42characters. As sysread and syswrite are used for all I/O, their
43treatment of characters applies to this module as well. 43treatment of characters applies to this module as well.
44 44
45At the very minimum, you should specify C<fh> or C<connect>, and the 45At the very minimum, you should specify C<fh> or C<connect>, and the
46C<on_error> callback. 46C<on_error> callback.
47 47
… …
60use AnyEvent (); BEGIN { AnyEvent::common_sense } 60use AnyEvent (); BEGIN { AnyEvent::common_sense }
61use AnyEvent::Util qw(WSAEWOULDBLOCK); 61use AnyEvent::Util qw(WSAEWOULDBLOCK);
62 62
63our $VERSION = $AnyEvent::VERSION; 63our $VERSION = $AnyEvent::VERSION;
64 64
65sub _load_func($) {
66 my $func = $_[0];
67
68 unless (defined &$func) {
69 my $pkg = $func;
70 do {
71 $pkg =~ s/::[^:]+$//
72 or return;
73 eval "require $pkg";
74 } until defined &$func;
75 }
76
77 \&$func
78}
79
80sub MAX_READ_SIZE() { 131072 }
81
65=head1 METHODS 82=head1 METHODS
66 83
67=over 4 84=over 4
68 85
69=item $handle = B<new> AnyEvent::TLS fh => $filehandle, key => value... 86=item $handle = B<new> AnyEvent::Handle fh => $filehandle, key => value...
70 87
71The constructor supports these arguments (all as C<< key => value >> pairs). 88The constructor supports these arguments (all as C<< key => value >> pairs).
72 89
73=over 4 90=over 4
74 91
… …
103prepare the file handle with parameters required for the actual connect 120prepare the file handle with parameters required for the actual connect
104(as opposed to settings that can be changed when the connection is already 121(as opposed to settings that can be changed when the connection is already
105established). 122established).
106 123
107The return value of this callback should be the connect timeout value in 124The return value of this callback should be the connect timeout value in
108seconds (or C<0>, or C<undef>, or the empty list, to indicate the default 125seconds (or C<0>, or C<undef>, or the empty list, to indicate that the
109timeout is to be used). 126default timeout is to be used).
110 127
111=item on_connect => $cb->($handle, $host, $port, $retry->()) 128=item on_connect => $cb->($handle, $host, $port, $retry->())
112 129
113This callback is called when a connection has been successfully established. 130This callback is called when a connection has been successfully established.
114 131
115The actual numeric host and port (the socket peername) are passed as 132The peer's numeric host and port (the socket peername) are passed as
116parameters, together with a retry callback. 133parameters, together with a retry callback.
117 134
118When, for some reason, the handle is not acceptable, then calling 135If, for some reason, the handle is not acceptable, calling C<$retry>
119C<$retry> will continue with the next conenction target (in case of 136will continue with the next connection target (in case of multi-homed
120multi-homed hosts or SRV records there can be multiple connection 137hosts or SRV records there can be multiple connection endpoints). At the
121endpoints). When it is called then the read and write queues, eof status, 138time it is called the read and write queues, eof status, tls status and
122tls status and similar properties of the handle are being reset. 139similar properties of the handle will have been reset.
123 140
124In most cases, ignoring the C<$retry> parameter is the way to go. 141In most cases, you should ignore the C<$retry> parameter.
125 142
126=item on_connect_error => $cb->($handle, $message) 143=item on_connect_error => $cb->($handle, $message)
127 144
128This callback is called when the conenction could not be 145This callback is called when the connection could not be
129established. C<$!> will contain the relevant error code, and C<$message> a 146established. C<$!> will contain the relevant error code, and C<$message> a
130message describing it (usually the same as C<"$!">). 147message describing it (usually the same as C<"$!">).
131 148
132If this callback isn't specified, then C<on_error> will be called with a 149If this callback isn't specified, then C<on_error> will be called with a
133fatal error instead. 150fatal error instead.
… …
136 153
137=item on_error => $cb->($handle, $fatal, $message) 154=item on_error => $cb->($handle, $fatal, $message)
138 155
139This is the error callback, which is called when, well, some error 156This is the error callback, which is called when, well, some error
140occured, such as not being able to resolve the hostname, failure to 157occured, such as not being able to resolve the hostname, failure to
141connect or a read error. 158connect, or a read error.
142 159
143Some errors are fatal (which is indicated by C<$fatal> being true). On 160Some errors are fatal (which is indicated by C<$fatal> being true). On
144fatal errors the handle object will be destroyed (by a call to C<< -> 161fatal errors the handle object will be destroyed (by a call to C<< ->
145destroy >>) after invoking the error callback (which means you are free to 162destroy >>) after invoking the error callback (which means you are free to
146examine the handle object). Examples of fatal errors are an EOF condition 163examine the handle object). Examples of fatal errors are an EOF condition
147with active (but unsatisifable) read watchers (C<EPIPE>) or I/O errors. In 164with active (but unsatisfiable) read watchers (C<EPIPE>) or I/O errors. In
148cases where the other side can close the connection at their will it is 165cases where the other side can close the connection at will, it is
149often easiest to not report C<EPIPE> errors in this callback. 166often easiest to not report C<EPIPE> errors in this callback.
150 167
151AnyEvent::Handle tries to find an appropriate error code for you to check 168AnyEvent::Handle tries to find an appropriate error code for you to check
152against, but in some cases (TLS errors), this does not work well. It is 169against, but in some cases (TLS errors), this does not work well. It is
153recommended to always output the C<$message> argument in human-readable 170recommended to always output the C<$message> argument in human-readable
154error messages (it's usually the same as C<"$!">). 171error messages (it's usually the same as C<"$!">).
155 172
156Non-fatal errors can be retried by simply returning, but it is recommended 173Non-fatal errors can be retried by returning, but it is recommended
157to simply ignore this parameter and instead abondon the handle object 174to simply ignore this parameter and instead abondon the handle object
158when this callback is invoked. Examples of non-fatal errors are timeouts 175when this callback is invoked. Examples of non-fatal errors are timeouts
159C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>). 176C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>).
160 177
161On callback entrance, the value of C<$!> contains the operating system 178On entry to the callback, the value of C<$!> contains the operating
162error code (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT>, C<EBADMSG> or 179system error code (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT>, C<EBADMSG> or
163C<EPROTO>). 180C<EPROTO>).
164 181
165While not mandatory, it is I<highly> recommended to set this callback, as 182While not mandatory, it is I<highly> recommended to set this callback, as
166you will not be notified of errors otherwise. The default simply calls 183you will not be notified of errors otherwise. The default just calls
167C<croak>. 184C<croak>.
168 185
169=item on_read => $cb->($handle) 186=item on_read => $cb->($handle)
170 187
171This sets the default read callback, which is called when data arrives 188This sets the default read callback, which is called when data arrives
… …
176To access (and remove data from) the read buffer, use the C<< ->rbuf >> 193To access (and remove data from) the read buffer, use the C<< ->rbuf >>
177method or access the C<< $handle->{rbuf} >> member directly. Note that you 194method or access the C<< $handle->{rbuf} >> member directly. Note that you
178must not enlarge or modify the read buffer, you can only remove data at 195must not enlarge or modify the read buffer, you can only remove data at
179the beginning from it. 196the beginning from it.
180 197
198You can also call C<< ->push_read (...) >> or any other function that
199modifies the read queue. Or do both. Or ...
200
181When an EOF condition is detected then AnyEvent::Handle will first try to 201When an EOF condition is detected, AnyEvent::Handle will first try to
182feed all the remaining data to the queued callbacks and C<on_read> before 202feed all the remaining data to the queued callbacks and C<on_read> before
183calling the C<on_eof> callback. If no progress can be made, then a fatal 203calling the C<on_eof> callback. If no progress can be made, then a fatal
184error will be raised (with C<$!> set to C<EPIPE>). 204error will be raised (with C<$!> set to C<EPIPE>).
185 205
186Note that, unlike requests in the read queue, an C<on_read> callback 206Note that, unlike requests in the read queue, an C<on_read> callback
… …
205set, then a fatal error will be raised with C<$!> set to <0>. 225set, then a fatal error will be raised with C<$!> set to <0>.
206 226
207=item on_drain => $cb->($handle) 227=item on_drain => $cb->($handle)
208 228
209This sets the callback that is called when the write buffer becomes empty 229This sets the callback that is called when the write buffer becomes empty
210(or when the callback is set and the buffer is empty already). 230(or immediately if the buffer is empty already).
211 231
212To append to the write buffer, use the C<< ->push_write >> method. 232To append to the write buffer, use the C<< ->push_write >> method.
213 233
214This callback is useful when you don't want to put all of your write data 234This callback is useful when you don't want to put all of your write data
215into the queue at once, for example, when you want to write the contents 235into the queue at once, for example, when you want to write the contents
… …
227many seconds pass without a successful read or write on the underlying 247many seconds pass without a successful read or write on the underlying
228file handle (or a call to C<timeout_reset>), the C<on_timeout> callback 248file handle (or a call to C<timeout_reset>), the C<on_timeout> callback
229will be invoked (and if that one is missing, a non-fatal C<ETIMEDOUT> 249will be invoked (and if that one is missing, a non-fatal C<ETIMEDOUT>
230error will be raised). 250error will be raised).
231 251
232There are three variants of the timeouts that work fully independent 252There are three variants of the timeouts that work independently
233of each other, for both read and write, just read, and just write: 253of each other, for both read and write, just read, and just write:
234C<timeout>, C<rtimeout> and C<wtimeout>, with corresponding callbacks 254C<timeout>, C<rtimeout> and C<wtimeout>, with corresponding callbacks
235C<on_timeout>, C<on_rtimeout> and C<on_wtimeout>, and reset functions 255C<on_timeout>, C<on_rtimeout> and C<on_wtimeout>, and reset functions
236C<timeout_reset>, C<rtimeout_reset>, and C<wtimeout_reset>. 256C<timeout_reset>, C<rtimeout_reset>, and C<wtimeout_reset>.
237 257
238Note that timeout processing is also active when you currently do not have 258Note that timeout processing is active even when you do not have
239any outstanding read or write requests: If you plan to keep the connection 259any outstanding read or write requests: If you plan to keep the connection
240idle then you should disable the timout temporarily or ignore the timeout 260idle then you should disable the timeout temporarily or ignore the timeout
241in the C<on_timeout> callback, in which case AnyEvent::Handle will simply 261in the C<on_timeout> callback, in which case AnyEvent::Handle will simply
242restart the timeout. 262restart the timeout.
243 263
244Zero (the default) disables this timeout. 264Zero (the default) disables this timeout.
245 265
… …
261amount of data without a callback ever being called as long as the line 281amount of data without a callback ever being called as long as the line
262isn't finished). 282isn't finished).
263 283
264=item autocork => <boolean> 284=item autocork => <boolean>
265 285
266When disabled (the default), then C<push_write> will try to immediately 286When disabled (the default), C<push_write> will try to immediately
267write the data to the handle, if possible. This avoids having to register 287write the data to the handle if possible. This avoids having to register
268a write watcher and wait for the next event loop iteration, but can 288a write watcher and wait for the next event loop iteration, but can
269be inefficient if you write multiple small chunks (on the wire, this 289be inefficient if you write multiple small chunks (on the wire, this
270disadvantage is usually avoided by your kernel's nagle algorithm, see 290disadvantage is usually avoided by your kernel's nagle algorithm, see
271C<no_delay>, but this option can save costly syscalls). 291C<no_delay>, but this option can save costly syscalls).
272 292
273When enabled, then writes will always be queued till the next event loop 293When enabled, writes will always be queued till the next event loop
274iteration. This is efficient when you do many small writes per iteration, 294iteration. This is efficient when you do many small writes per iteration,
275but less efficient when you do a single write only per iteration (or when 295but less efficient when you do a single write only per iteration (or when
276the write buffer often is full). It also increases write latency. 296the write buffer often is full). It also increases write latency.
277 297
278=item no_delay => <boolean> 298=item no_delay => <boolean>
… …
282the Nagle algorithm, and usually it is beneficial. 302the Nagle algorithm, and usually it is beneficial.
283 303
284In some situations you want as low a delay as possible, which can be 304In some situations you want as low a delay as possible, which can be
285accomplishd by setting this option to a true value. 305accomplishd by setting this option to a true value.
286 306
287The default is your opertaing system's default behaviour (most likely 307The default is your operating system's default behaviour (most likely
288enabled), this option explicitly enables or disables it, if possible. 308enabled). This option explicitly enables or disables it, if possible.
309
310=item keepalive => <boolean>
311
312Enables (default disable) the SO_KEEPALIVE option on the stream socket:
313normally, TCP connections have no time-out once established, so TCP
314connections, once established, can stay alive forever even when the other
315side has long gone. TCP keepalives are a cheap way to take down long-lived
316TCP connections when the other side becomes unreachable. While the default
317is OS-dependent, TCP keepalives usually kick in after around two hours,
318and, if the other side doesn't reply, take down the TCP connection some 10
319to 15 minutes later.
320
321It is harmless to specify this option for file handles that do not support
322keepalives, and enabling it on connections that are potentially long-lived
323is usually a good idea.
324
325=item oobinline => <boolean>
326
327BSD majorly fucked up the implementation of TCP urgent data. The result
328is that almost no OS implements TCP according to the specs, and every OS
329implements it slightly differently.
330
331If you want to handle TCP urgent data, then setting this flag (the default
332is enabled) gives you the most portable way of getting urgent data, by
333putting it into the stream.
334
335Since BSD emulation of OOB data on top of TCP's urgent data can have
336security implications, AnyEvent::Handle sets this flag automatically
337unless explicitly specified. Note that setting this flag after
338establishing a connection I<may> be a bit too late (data loss could
339already have occured on BSD systems), but at least it will protect you
340from most attacks.
289 341
290=item read_size => <bytes> 342=item read_size => <bytes>
291 343
292The default read block size (the amount of bytes this module will 344The initial read block size, the number of bytes this module will try to
293try to read during each loop iteration, which affects memory 345read during each loop iteration. Each handle object will consume at least
294requirements). Default: C<8192>. 346this amount of memory for the read buffer as well, so when handling many
347connections requirements). See also C<max_read_size>. Default: C<2048>.
348
349=item max_read_size => <bytes>
350
351The maximum read buffer size used by the dynamic adjustment
352algorithm: Each time AnyEvent::Handle can read C<read_size> bytes in
353one go it will double C<read_size> up to the maximum given by this
354option. Default: C<131072> or C<read_size>, whichever is higher.
295 355
296=item low_water_mark => <bytes> 356=item low_water_mark => <bytes>
297 357
298Sets the amount of bytes (default: C<0>) that make up an "empty" write 358Sets the number of bytes (default: C<0>) that make up an "empty" write
299buffer: If the write reaches this size or gets even samller it is 359buffer: If the buffer reaches this size or gets even samller it is
300considered empty. 360considered empty.
301 361
302Sometimes it can be beneficial (for performance reasons) to add data to 362Sometimes it can be beneficial (for performance reasons) to add data to
303the write buffer before it is fully drained, but this is a rare case, as 363the write buffer before it is fully drained, but this is a rare case, as
304the operating system kernel usually buffers data as well, so the default 364the operating system kernel usually buffers data as well, so the default
305is good in almost all cases. 365is good in almost all cases.
306 366
307=item linger => <seconds> 367=item linger => <seconds>
308 368
309If non-zero (default: C<3600>), then the destructor of the 369If this is non-zero (default: C<3600>), the destructor of the
310AnyEvent::Handle object will check whether there is still outstanding 370AnyEvent::Handle object will check whether there is still outstanding
311write data and will install a watcher that will write this data to the 371write data and will install a watcher that will write this data to the
312socket. No errors will be reported (this mostly matches how the operating 372socket. No errors will be reported (this mostly matches how the operating
313system treats outstanding data at socket close time). 373system treats outstanding data at socket close time).
314 374
… …
321A string used to identify the remote site - usually the DNS hostname 381A string used to identify the remote site - usually the DNS hostname
322(I<not> IDN!) used to create the connection, rarely the IP address. 382(I<not> IDN!) used to create the connection, rarely the IP address.
323 383
324Apart from being useful in error messages, this string is also used in TLS 384Apart from being useful in error messages, this string is also used in TLS
325peername verification (see C<verify_peername> in L<AnyEvent::TLS>). This 385peername verification (see C<verify_peername> in L<AnyEvent::TLS>). This
326verification will be skipped when C<peername> is not specified or 386verification will be skipped when C<peername> is not specified or is
327C<undef>. 387C<undef>.
328 388
329=item tls => "accept" | "connect" | Net::SSLeay::SSL object 389=item tls => "accept" | "connect" | Net::SSLeay::SSL object
330 390
331When this parameter is given, it enables TLS (SSL) mode, that means 391When this parameter is given, it enables TLS (SSL) mode, that means
332AnyEvent will start a TLS handshake as soon as the conenction has been 392AnyEvent will start a TLS handshake as soon as the connection has been
333established and will transparently encrypt/decrypt data afterwards. 393established and will transparently encrypt/decrypt data afterwards.
334 394
335All TLS protocol errors will be signalled as C<EPROTO>, with an 395All TLS protocol errors will be signalled as C<EPROTO>, with an
336appropriate error message. 396appropriate error message.
337 397
… …
357B<IMPORTANT:> since Net::SSLeay "objects" are really only integers, 417B<IMPORTANT:> since Net::SSLeay "objects" are really only integers,
358passing in the wrong integer will lead to certain crash. This most often 418passing in the wrong integer will lead to certain crash. This most often
359happens when one uses a stylish C<< tls => 1 >> and is surprised about the 419happens when one uses a stylish C<< tls => 1 >> and is surprised about the
360segmentation fault. 420segmentation fault.
361 421
362See the C<< ->starttls >> method for when need to start TLS negotiation later. 422Use the C<< ->starttls >> method if you need to start TLS negotiation later.
363 423
364=item tls_ctx => $anyevent_tls 424=item tls_ctx => $anyevent_tls
365 425
366Use the given C<AnyEvent::TLS> object to create the new TLS connection 426Use the given C<AnyEvent::TLS> object to create the new TLS connection
367(unless a connection object was specified directly). If this parameter is 427(unless a connection object was specified directly). If this parameter is
… …
382 442
383TLS handshake failures will not cause C<on_error> to be invoked when this 443TLS handshake failures will not cause C<on_error> to be invoked when this
384callback is in effect, instead, the error message will be passed to C<on_starttls>. 444callback is in effect, instead, the error message will be passed to C<on_starttls>.
385 445
386Without this callback, handshake failures lead to C<on_error> being 446Without this callback, handshake failures lead to C<on_error> being
387called, as normal. 447called as usual.
388 448
389Note that you cannot call C<starttls> right again in this callback. If you 449Note that you cannot just call C<starttls> again in this callback. If you
390need to do that, start an zero-second timer instead whose callback can 450need to do that, start an zero-second timer instead whose callback can
391then call C<< ->starttls >> again. 451then call C<< ->starttls >> again.
392 452
393=item on_stoptls => $cb->($handle) 453=item on_stoptls => $cb->($handle)
394 454
… …
484} 544}
485 545
486sub _start { 546sub _start {
487 my ($self) = @_; 547 my ($self) = @_;
488 548
549 # too many clueless people try to use udp and similar sockets
550 # with AnyEvent::Handle, do them a favour.
551 my $type = getsockopt $self->{fh}, Socket::SOL_SOCKET (), Socket::SO_TYPE ();
552 Carp::croak "AnyEvent::Handle: only stream sockets supported, anything else will NOT work!"
553 if Socket::SOCK_STREAM () != (unpack "I", $type) && defined $type;
554
489 AnyEvent::Util::fh_nonblocking $self->{fh}, 1; 555 AnyEvent::Util::fh_nonblocking $self->{fh}, 1;
490 556
491 $self->{_activity} = 557 $self->{_activity} =
492 $self->{_ractivity} = 558 $self->{_ractivity} =
493 $self->{_wactivity} = AE::now; 559 $self->{_wactivity} = AE::now;
494 560
561 $self->{read_size} ||= 2048;
562 $self->{max_read_size} = $self->{read_size}
563 if $self->{read_size} > ($self->{max_read_size} || MAX_READ_SIZE);
564
495 $self->timeout (delete $self->{timeout} ) if $self->{timeout}; 565 $self->timeout (delete $self->{timeout} ) if $self->{timeout};
496 $self->rtimeout (delete $self->{rtimeout}) if $self->{rtimeout}; 566 $self->rtimeout (delete $self->{rtimeout} ) if $self->{rtimeout};
497 $self->wtimeout (delete $self->{wtimeout}) if $self->{wtimeout}; 567 $self->wtimeout (delete $self->{wtimeout} ) if $self->{wtimeout};
498 568
499 $self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay}; 569 $self->no_delay (delete $self->{no_delay} ) if exists $self->{no_delay} && $self->{no_delay};
570 $self->keepalive (delete $self->{keepalive}) if exists $self->{keepalive} && $self->{keepalive};
500 571
572 $self->oobinline (exists $self->{oobinline} ? delete $self->{oobinline} : 1);
573
501 $self->starttls (delete $self->{tls}, delete $self->{tls_ctx}) 574 $self->starttls (delete $self->{tls}, delete $self->{tls_ctx})
502 if $self->{tls}; 575 if $self->{tls};
503 576
504 $self->on_drain (delete $self->{on_drain}) if $self->{on_drain}; 577 $self->on_drain (delete $self->{on_drain} ) if $self->{on_drain};
505 578
506 $self->start_read 579 $self->start_read
507 if $self->{on_read} || @{ $self->{_queue} }; 580 if $self->{on_read} || @{ $self->{_queue} };
508 581
509 $self->_drain_wbuf; 582 $self->_drain_wbuf;
… …
516 $message ||= "$!"; 589 $message ||= "$!";
517 590
518 if ($self->{on_error}) { 591 if ($self->{on_error}) {
519 $self->{on_error}($self, $fatal, $message); 592 $self->{on_error}($self, $fatal, $message);
520 $self->destroy if $fatal; 593 $self->destroy if $fatal;
521 } elsif ($self->{fh}) { 594 } elsif ($self->{fh} || $self->{connect}) {
522 $self->destroy; 595 $self->destroy;
523 Carp::croak "AnyEvent::Handle uncaught error: $message"; 596 Carp::croak "AnyEvent::Handle uncaught error: $message";
524 } 597 }
525} 598}
526 599
… …
585=cut 658=cut
586 659
587sub no_delay { 660sub no_delay {
588 $_[0]{no_delay} = $_[1]; 661 $_[0]{no_delay} = $_[1];
589 662
663 setsockopt $_[0]{fh}, Socket::IPPROTO_TCP (), Socket::TCP_NODELAY (), int $_[1]
664 if $_[0]{fh};
665}
666
667=item $handle->keepalive ($boolean)
668
669Enables or disables the C<keepalive> setting (see constructor argument of
670the same name for details).
671
672=cut
673
674sub keepalive {
675 $_[0]{keepalive} = $_[1];
676
590 eval { 677 eval {
591 local $SIG{__DIE__}; 678 local $SIG{__DIE__};
592 setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1] 679 setsockopt $_[0]{fh}, Socket::SOL_SOCKET (), Socket::SO_KEEPALIVE (), int $_[1]
593 if $_[0]{fh}; 680 if $_[0]{fh};
594 }; 681 };
595} 682}
596 683
684=item $handle->oobinline ($boolean)
685
686Enables or disables the C<oobinline> setting (see constructor argument of
687the same name for details).
688
689=cut
690
691sub oobinline {
692 $_[0]{oobinline} = $_[1];
693
694 eval {
695 local $SIG{__DIE__};
696 setsockopt $_[0]{fh}, Socket::SOL_SOCKET (), Socket::SO_OOBINLINE (), int $_[1]
697 if $_[0]{fh};
698 };
699}
700
701=item $handle->keepalive ($boolean)
702
703Enables or disables the C<keepalive> setting (see constructor argument of
704the same name for details).
705
706=cut
707
708sub keepalive {
709 $_[0]{keepalive} = $_[1];
710
711 eval {
712 local $SIG{__DIE__};
713 setsockopt $_[0]{fh}, Socket::SOL_SOCKET (), Socket::SO_KEEPALIVE (), int $_[1]
714 if $_[0]{fh};
715 };
716}
717
597=item $handle->on_starttls ($cb) 718=item $handle->on_starttls ($cb)
598 719
599Replace the current C<on_starttls> callback (see the C<on_starttls> constructor argument). 720Replace the current C<on_starttls> callback (see the C<on_starttls> constructor argument).
600 721
601=cut 722=cut
… …
608 729
609Replace the current C<on_stoptls> callback (see the C<on_stoptls> constructor argument). 730Replace the current C<on_stoptls> callback (see the C<on_stoptls> constructor argument).
610 731
611=cut 732=cut
612 733
613sub on_starttls { 734sub on_stoptls {
614 $_[0]{on_stoptls} = $_[1]; 735 $_[0]{on_stoptls} = $_[1];
615} 736}
616 737
617=item $handle->rbuf_max ($max_octets) 738=item $handle->rbuf_max ($max_octets)
618 739
… …
657 $_[0]{$on_timeout} = $_[1]; 778 $_[0]{$on_timeout} = $_[1];
658 }; 779 };
659 780
660 *$timeout = sub { 781 *$timeout = sub {
661 my ($self, $new_value) = @_; 782 my ($self, $new_value) = @_;
783
784 $new_value >= 0
785 or Carp::croak "AnyEvent::Handle->$timeout called with negative timeout ($new_value), caught";
662 786
663 $self->{$timeout} = $new_value; 787 $self->{$timeout} = $new_value;
664 delete $self->{$tw}; &$cb; 788 delete $self->{$tw}; &$cb;
665 }; 789 };
666 790
… …
730=item $handle->on_drain ($cb) 854=item $handle->on_drain ($cb)
731 855
732Sets the C<on_drain> callback or clears it (see the description of 856Sets the C<on_drain> callback or clears it (see the description of
733C<on_drain> in the constructor). 857C<on_drain> in the constructor).
734 858
859This method may invoke callbacks (and therefore the handle might be
860destroyed after it returns).
861
735=cut 862=cut
736 863
737sub on_drain { 864sub on_drain {
738 my ($self, $cb) = @_; 865 my ($self, $cb) = @_;
739 866
… …
746=item $handle->push_write ($data) 873=item $handle->push_write ($data)
747 874
748Queues the given scalar to be written. You can push as much data as you 875Queues the given scalar to be written. You can push as much data as you
749want (only limited by the available memory), as C<AnyEvent::Handle> 876want (only limited by the available memory), as C<AnyEvent::Handle>
750buffers it independently of the kernel. 877buffers it independently of the kernel.
878
879This method may invoke callbacks (and therefore the handle might be
880destroyed after it returns).
751 881
752=cut 882=cut
753 883
754sub _drain_wbuf { 884sub _drain_wbuf {
755 my ($self) = @_; 885 my ($self) = @_;
… …
785 }; 915 };
786} 916}
787 917
788our %WH; 918our %WH;
789 919
920# deprecated
790sub register_write_type($$) { 921sub register_write_type($$) {
791 $WH{$_[0]} = $_[1]; 922 $WH{$_[0]} = $_[1];
792} 923}
793 924
794sub push_write { 925sub push_write {
795 my $self = shift; 926 my $self = shift;
796 927
797 if (@_ > 1) { 928 if (@_ > 1) {
798 my $type = shift; 929 my $type = shift;
799 930
931 @_ = ($WH{$type} ||= _load_func "$type\::anyevent_write_type"
800 @_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write") 932 or Carp::croak "unsupported/unloadable type '$type' passed to AnyEvent::Handle::push_write")
801 ->($self, @_); 933 ->($self, @_);
802 } 934 }
803 935
936 # we downgrade here to avoid hard-to-track-down bugs,
937 # and diagnose the problem earlier and better.
938
804 if ($self->{tls}) { 939 if ($self->{tls}) {
805 $self->{_tls_wbuf} .= $_[0]; 940 utf8::downgrade $self->{_tls_wbuf} .= $_[0];
806 &_dotls ($self) if $self->{fh}; 941 &_dotls ($self) if $self->{fh};
807 } else { 942 } else {
808 $self->{wbuf} .= $_[0]; 943 utf8::downgrade $self->{wbuf} .= $_[0];
809 $self->_drain_wbuf if $self->{fh}; 944 $self->_drain_wbuf if $self->{fh};
810 } 945 }
811} 946}
812 947
813=item $handle->push_write (type => @args) 948=item $handle->push_write (type => @args)
814 949
815Instead of formatting your data yourself, you can also let this module do 950Instead of formatting your data yourself, you can also let this module
816the job by specifying a type and type-specific arguments. 951do the job by specifying a type and type-specific arguments. You
952can also specify the (fully qualified) name of a package, in which
953case AnyEvent tries to load the package and then expects to find the
954C<anyevent_write_type> function inside (see "custom write types", below).
817 955
818Predefined types are (if you have ideas for additional types, feel free to 956Predefined types are (if you have ideas for additional types, feel free to
819drop by and tell us): 957drop by and tell us):
820 958
821=over 4 959=over 4
… …
924the peer. 1062the peer.
925 1063
926You can rely on the normal read queue and C<on_eof> handling 1064You can rely on the normal read queue and C<on_eof> handling
927afterwards. This is the cleanest way to close a connection. 1065afterwards. This is the cleanest way to close a connection.
928 1066
1067This method may invoke callbacks (and therefore the handle might be
1068destroyed after it returns).
1069
929=cut 1070=cut
930 1071
931sub push_shutdown { 1072sub push_shutdown {
932 my ($self) = @_; 1073 my ($self) = @_;
933 1074
934 delete $self->{low_water_mark}; 1075 delete $self->{low_water_mark};
935 $self->on_drain (sub { shutdown $_[0]{fh}, 1 }); 1076 $self->on_drain (sub { shutdown $_[0]{fh}, 1 });
936} 1077}
937 1078
938=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args) 1079=item custom write types - Package::anyevent_write_type $handle, @args
939 1080
940This function (not method) lets you add your own types to C<push_write>. 1081Instead of one of the predefined types, you can also specify the name of
1082a package. AnyEvent will try to load the package and then expects to find
1083a function named C<anyevent_write_type> inside. If it isn't found, it
1084progressively tries to load the parent package until it either finds the
1085function (good) or runs out of packages (bad).
1086
941Whenever the given C<type> is used, C<push_write> will invoke the code 1087Whenever the given C<type> is used, C<push_write> will the function with
942reference with the handle object and the remaining arguments. 1088the handle object and the remaining arguments.
943 1089
944The code reference is supposed to return a single octet string that will 1090The function is supposed to return a single octet string that will be
945be appended to the write buffer. 1091appended to the write buffer, so you cna mentally treat this function as a
1092"arguments to on-the-wire-format" converter.
946 1093
947Note that this is a function, and all types registered this way will be 1094Example: implement a custom write type C<join> that joins the remaining
948global, so try to use unique names. 1095arguments using the first one.
1096
1097 $handle->push_write (My::Type => " ", 1,2,3);
1098
1099 # uses the following package, which can be defined in the "My::Type" or in
1100 # the "My" modules to be auto-loaded, or just about anywhere when the
1101 # My::Type::anyevent_write_type is defined before invoking it.
1102
1103 package My::Type;
1104
1105 sub anyevent_write_type {
1106 my ($handle, $delim, @args) = @_;
1107
1108 join $delim, @args
1109 }
949 1110
950=cut 1111=cut
951 1112
952############################################################################# 1113#############################################################################
953 1114
… …
962ways, the "simple" way, using only C<on_read> and the "complex" way, using 1123ways, the "simple" way, using only C<on_read> and the "complex" way, using
963a queue. 1124a queue.
964 1125
965In the simple case, you just install an C<on_read> callback and whenever 1126In the simple case, you just install an C<on_read> callback and whenever
966new data arrives, it will be called. You can then remove some data (if 1127new data arrives, it will be called. You can then remove some data (if
967enough is there) from the read buffer (C<< $handle->rbuf >>). Or you cna 1128enough is there) from the read buffer (C<< $handle->rbuf >>). Or you can
968leave the data there if you want to accumulate more (e.g. when only a 1129leave the data there if you want to accumulate more (e.g. when only a
969partial message has been received so far). 1130partial message has been received so far), or change the read queue with
1131e.g. C<push_read>.
970 1132
971In the more complex case, you want to queue multiple callbacks. In this 1133In the more complex case, you want to queue multiple callbacks. In this
972case, AnyEvent::Handle will call the first queued callback each time new 1134case, AnyEvent::Handle will call the first queued callback each time new
973data arrives (also the first time it is queued) and removes it when it has 1135data arrives (also the first time it is queued) and remove it when it has
974done its job (see C<push_read>, below). 1136done its job (see C<push_read>, below).
975 1137
976This way you can, for example, push three line-reads, followed by reading 1138This way you can, for example, push three line-reads, followed by reading
977a chunk of data, and AnyEvent::Handle will execute them in order. 1139a chunk of data, and AnyEvent::Handle will execute them in order.
978 1140
… …
1109 1271
1110This replaces the currently set C<on_read> callback, or clears it (when 1272This replaces the currently set C<on_read> callback, or clears it (when
1111the new callback is C<undef>). See the description of C<on_read> in the 1273the new callback is C<undef>). See the description of C<on_read> in the
1112constructor. 1274constructor.
1113 1275
1276This method may invoke callbacks (and therefore the handle might be
1277destroyed after it returns).
1278
1114=cut 1279=cut
1115 1280
1116sub on_read { 1281sub on_read {
1117 my ($self, $cb) = @_; 1282 my ($self, $cb) = @_;
1118 1283
… …
1120 $self->_drain_rbuf if $cb; 1285 $self->_drain_rbuf if $cb;
1121} 1286}
1122 1287
1123=item $handle->rbuf 1288=item $handle->rbuf
1124 1289
1125Returns the read buffer (as a modifiable lvalue). 1290Returns the read buffer (as a modifiable lvalue). You can also access the
1291read buffer directly as the C<< ->{rbuf} >> member, if you want (this is
1292much faster, and no less clean).
1126 1293
1127You can access the read buffer directly as the C<< ->{rbuf} >> 1294The only operation allowed on the read buffer (apart from looking at it)
1128member, if you want. However, the only operation allowed on the 1295is removing data from its beginning. Otherwise modifying or appending to
1129read buffer (apart from looking at it) is removing data from its 1296it is not allowed and will lead to hard-to-track-down bugs.
1130beginning. Otherwise modifying or appending to it is not allowed and will
1131lead to hard-to-track-down bugs.
1132 1297
1133NOTE: The read buffer should only be used or modified if the C<on_read>, 1298NOTE: The read buffer should only be used or modified in the C<on_read>
1134C<push_read> or C<unshift_read> methods are used. The other read methods 1299callback or when C<push_read> or C<unshift_read> are used with a single
1135automatically manage the read buffer. 1300callback (i.e. untyped). Typed C<push_read> and C<unshift_read> methods
1301will manage the read buffer on their own.
1136 1302
1137=cut 1303=cut
1138 1304
1139sub rbuf : lvalue { 1305sub rbuf : lvalue {
1140 $_[0]{rbuf} 1306 $_[0]{rbuf}
… …
1157 1323
1158If enough data was available, then the callback must remove all data it is 1324If enough data was available, then the callback must remove all data it is
1159interested in (which can be none at all) and return a true value. After returning 1325interested in (which can be none at all) and return a true value. After returning
1160true, it will be removed from the queue. 1326true, it will be removed from the queue.
1161 1327
1328These methods may invoke callbacks (and therefore the handle might be
1329destroyed after it returns).
1330
1162=cut 1331=cut
1163 1332
1164our %RH; 1333our %RH;
1165 1334
1166sub register_read_type($$) { 1335sub register_read_type($$) {
… …
1172 my $cb = pop; 1341 my $cb = pop;
1173 1342
1174 if (@_) { 1343 if (@_) {
1175 my $type = shift; 1344 my $type = shift;
1176 1345
1346 $cb = ($RH{$type} ||= _load_func "$type\::anyevent_read_type"
1177 $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read") 1347 or Carp::croak "unsupported/unloadable type '$type' passed to AnyEvent::Handle::push_read")
1178 ->($self, $cb, @_); 1348 ->($self, $cb, @_);
1179 } 1349 }
1180 1350
1181 push @{ $self->{_queue} }, $cb; 1351 push @{ $self->{_queue} }, $cb;
1182 $self->_drain_rbuf; 1352 $self->_drain_rbuf;
… …
1187 my $cb = pop; 1357 my $cb = pop;
1188 1358
1189 if (@_) { 1359 if (@_) {
1190 my $type = shift; 1360 my $type = shift;
1191 1361
1362 $cb = ($RH{$type} ||= _load_func "$type\::anyevent_read_type"
1192 $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read") 1363 or Carp::croak "unsupported/unloadable type '$type' passed to AnyEvent::Handle::unshift_read")
1193 ->($self, $cb, @_); 1364 ->($self, $cb, @_);
1194 } 1365 }
1195
1196 1366
1197 unshift @{ $self->{_queue} }, $cb; 1367 unshift @{ $self->{_queue} }, $cb;
1198 $self->_drain_rbuf; 1368 $self->_drain_rbuf;
1199} 1369}
1200 1370
… …
1202 1372
1203=item $handle->unshift_read (type => @args, $cb) 1373=item $handle->unshift_read (type => @args, $cb)
1204 1374
1205Instead of providing a callback that parses the data itself you can chose 1375Instead of providing a callback that parses the data itself you can chose
1206between a number of predefined parsing formats, for chunks of data, lines 1376between a number of predefined parsing formats, for chunks of data, lines
1207etc. 1377etc. You can also specify the (fully qualified) name of a package, in
1378which case AnyEvent tries to load the package and then expects to find the
1379C<anyevent_read_type> function inside (see "custom read types", below).
1208 1380
1209Predefined types are (if you have ideas for additional types, feel free to 1381Predefined types are (if you have ideas for additional types, feel free to
1210drop by and tell us): 1382drop by and tell us):
1211 1383
1212=over 4 1384=over 4
… …
1304the receive buffer when neither C<$accept> nor C<$reject> match, 1476the receive buffer when neither C<$accept> nor C<$reject> match,
1305and everything preceding and including the match will be accepted 1477and everything preceding and including the match will be accepted
1306unconditionally. This is useful to skip large amounts of data that you 1478unconditionally. This is useful to skip large amounts of data that you
1307know cannot be matched, so that the C<$accept> or C<$reject> regex do not 1479know cannot be matched, so that the C<$accept> or C<$reject> regex do not
1308have to start matching from the beginning. This is purely an optimisation 1480have to start matching from the beginning. This is purely an optimisation
1309and is usually worth only when you expect more than a few kilobytes. 1481and is usually worth it only when you expect more than a few kilobytes.
1310 1482
1311Example: expect a http header, which ends at C<\015\012\015\012>. Since we 1483Example: expect a http header, which ends at C<\015\012\015\012>. Since we
1312expect the header to be very large (it isn't in practise, but...), we use 1484expect the header to be very large (it isn't in practice, but...), we use
1313a skip regex to skip initial portions. The skip regex is tricky in that 1485a skip regex to skip initial portions. The skip regex is tricky in that
1314it only accepts something not ending in either \015 or \012, as these are 1486it only accepts something not ending in either \015 or \012, as these are
1315required for the accept regex. 1487required for the accept regex.
1316 1488
1317 $handle->push_read (regex => 1489 $handle->push_read (regex =>
… …
1531 } 1703 }
1532}; 1704};
1533 1705
1534=back 1706=back
1535 1707
1536=item AnyEvent::Handle::register_read_type type => $coderef->($handle, $cb, @args) 1708=item custom read types - Package::anyevent_read_type $handle, $cb, @args
1537 1709
1538This function (not method) lets you add your own types to C<push_read>. 1710Instead of one of the predefined types, you can also specify the name
1711of a package. AnyEvent will try to load the package and then expects to
1712find a function named C<anyevent_read_type> inside. If it isn't found, it
1713progressively tries to load the parent package until it either finds the
1714function (good) or runs out of packages (bad).
1539 1715
1540Whenever the given C<type> is used, C<push_read> will invoke the code 1716Whenever this type is used, C<push_read> will invoke the function with the
1541reference with the handle object, the callback and the remaining 1717handle object, the original callback and the remaining arguments.
1542arguments.
1543 1718
1544The code reference is supposed to return a callback (usually a closure) 1719The function is supposed to return a callback (usually a closure) that
1545that works as a plain read callback (see C<< ->push_read ($cb) >>). 1720works as a plain read callback (see C<< ->push_read ($cb) >>), so you can
1721mentally treat the function as a "configurable read type to read callback"
1722converter.
1546 1723
1547It should invoke the passed callback when it is done reading (remember to 1724It should invoke the original callback when it is done reading (remember
1548pass C<$handle> as first argument as all other callbacks do that). 1725to pass C<$handle> as first argument as all other callbacks do that,
1726although there is no strict requirement on this).
1549 1727
1550Note that this is a function, and all types registered this way will be
1551global, so try to use unique names.
1552
1553For examples, see the source of this module (F<perldoc -m AnyEvent::Handle>, 1728For examples, see the source of this module (F<perldoc -m
1554search for C<register_read_type>)). 1729AnyEvent::Handle>, search for C<register_read_type>)).
1555 1730
1556=item $handle->stop_read 1731=item $handle->stop_read
1557 1732
1558=item $handle->start_read 1733=item $handle->start_read
1559 1734
… …
1579} 1754}
1580 1755
1581sub start_read { 1756sub start_read {
1582 my ($self) = @_; 1757 my ($self) = @_;
1583 1758
1584 unless ($self->{_rw} || $self->{_eof}) { 1759 unless ($self->{_rw} || $self->{_eof} || !$self->{fh}) {
1585 Scalar::Util::weaken $self; 1760 Scalar::Util::weaken $self;
1586 1761
1587 $self->{_rw} = AE::io $self->{fh}, 0, sub { 1762 $self->{_rw} = AE::io $self->{fh}, 0, sub {
1588 my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf}); 1763 my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});
1589 my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf; 1764 my $len = sysread $self->{fh}, $$rbuf, $self->{read_size}, length $$rbuf;
1590 1765
1591 if ($len > 0) { 1766 if ($len > 0) {
1592 $self->{_activity} = $self->{_ractivity} = AE::now; 1767 $self->{_activity} = $self->{_ractivity} = AE::now;
1593 1768
1594 if ($self->{tls}) { 1769 if ($self->{tls}) {
1595 Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf); 1770 Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);
1596 1771
1597 &_dotls ($self); 1772 &_dotls ($self);
1598 } else { 1773 } else {
1599 $self->_drain_rbuf; 1774 $self->_drain_rbuf;
1775 }
1776
1777 if ($len == $self->{read_size}) {
1778 $self->{read_size} *= 2;
1779 $self->{read_size} = $self->{max_read_size} || MAX_READ_SIZE
1780 if $self->{read_size} > ($self->{max_read_size} || MAX_READ_SIZE);
1600 } 1781 }
1601 1782
1602 } elsif (defined $len) { 1783 } elsif (defined $len) {
1603 delete $self->{_rw}; 1784 delete $self->{_rw};
1604 $self->{_eof} = 1; 1785 $self->{_eof} = 1;
… …
1682 && ($tmp != $ERROR_SYSCALL || $!); 1863 && ($tmp != $ERROR_SYSCALL || $!);
1683 1864
1684 while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) { 1865 while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) {
1685 $self->{wbuf} .= $tmp; 1866 $self->{wbuf} .= $tmp;
1686 $self->_drain_wbuf; 1867 $self->_drain_wbuf;
1868 $self->{tls} or return; # tls session might have gone away in callback
1687 } 1869 }
1688 1870
1689 $self->{_on_starttls} 1871 $self->{_on_starttls}
1690 and Net::SSLeay::state ($self->{tls}) == Net::SSLeay::ST_OK () 1872 and Net::SSLeay::state ($self->{tls}) == Net::SSLeay::ST_OK ()
1691 and (delete $self->{_on_starttls})->($self, 1, "TLS/SSL connection established"); 1873 and (delete $self->{_on_starttls})->($self, 1, "TLS/SSL connection established");
… …
1713context in C<< $handle->{tls_ctx} >> after this call and can be used or 1895context in C<< $handle->{tls_ctx} >> after this call and can be used or
1714changed to your liking. Note that the handshake might have already started 1896changed to your liking. Note that the handshake might have already started
1715when this function returns. 1897when this function returns.
1716 1898
1717Due to bugs in OpenSSL, it might or might not be possible to do multiple 1899Due to bugs in OpenSSL, it might or might not be possible to do multiple
1718handshakes on the same stream. Best do not attempt to use the stream after 1900handshakes on the same stream. It is best to not attempt to use the
1719stopping TLS. 1901stream after stopping TLS.
1902
1903This method may invoke callbacks (and therefore the handle might be
1904destroyed after it returns).
1720 1905
1721=cut 1906=cut
1722 1907
1723our %TLS_CACHE; #TODO not yet documented, should we? 1908our %TLS_CACHE; #TODO not yet documented, should we?
1724 1909
… …
1790 1975
1791=item $handle->stoptls 1976=item $handle->stoptls
1792 1977
1793Shuts down the SSL connection - this makes a proper EOF handshake by 1978Shuts down the SSL connection - this makes a proper EOF handshake by
1794sending a close notify to the other side, but since OpenSSL doesn't 1979sending a close notify to the other side, but since OpenSSL doesn't
1795support non-blocking shut downs, it is not guarenteed that you can re-use 1980support non-blocking shut downs, it is not guaranteed that you can re-use
1796the stream afterwards. 1981the stream afterwards.
1982
1983This method may invoke callbacks (and therefore the handle might be
1984destroyed after it returns).
1797 1985
1798=cut 1986=cut
1799 1987
1800sub stoptls { 1988sub stoptls {
1801 my ($self) = @_; 1989 my ($self) = @_;
1802 1990
1803 if ($self->{tls}) { 1991 if ($self->{tls} && $self->{fh}) {
1804 Net::SSLeay::shutdown ($self->{tls}); 1992 Net::SSLeay::shutdown ($self->{tls});
1805 1993
1806 &_dotls; 1994 &_dotls;
1807 1995
1808# # we don't give a shit. no, we do, but we can't. no...#d# 1996# # we don't give a shit. no, we do, but we can't. no...#d#
… …
1838 push @linger, AE::io $fh, 1, sub { 2026 push @linger, AE::io $fh, 1, sub {
1839 my $len = syswrite $fh, $wbuf, length $wbuf; 2027 my $len = syswrite $fh, $wbuf, length $wbuf;
1840 2028
1841 if ($len > 0) { 2029 if ($len > 0) {
1842 substr $wbuf, 0, $len, ""; 2030 substr $wbuf, 0, $len, "";
1843 } else { 2031 } elsif (defined $len || ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK)) {
1844 @linger = (); # end 2032 @linger = (); # end
1845 } 2033 }
1846 }; 2034 };
1847 push @linger, AE::timer $linger, 0, sub { 2035 push @linger, AE::timer $linger, 0, sub {
1848 @linger = (); 2036 @linger = ();
… …
1885 2073
1886sub AnyEvent::Handle::destroyed::AUTOLOAD { 2074sub AnyEvent::Handle::destroyed::AUTOLOAD {
1887 #nop 2075 #nop
1888} 2076}
1889 2077
2078=item $handle->destroyed
2079
2080Returns false as long as the handle hasn't been destroyed by a call to C<<
2081->destroy >>, true otherwise.
2082
2083Can be useful to decide whether the handle is still valid after some
2084callback possibly destroyed the handle. For example, C<< ->push_write >>,
2085C<< ->starttls >> and other methods can call user callbacks, which in turn
2086can destroy the handle, so work can be avoided by checking sometimes:
2087
2088 $hdl->starttls ("accept");
2089 return if $hdl->destroyed;
2090 $hdl->push_write (...
2091
2092Note that the call to C<push_write> will silently be ignored if the handle
2093has been destroyed, so often you can just ignore the possibility of the
2094handle being destroyed.
2095
2096=cut
2097
2098sub destroyed { 0 }
2099sub AnyEvent::Handle::destroyed::destroyed { 1 }
2100
1890=item AnyEvent::Handle::TLS_CTX 2101=item AnyEvent::Handle::TLS_CTX
1891 2102
1892This function creates and returns the AnyEvent::TLS object used by default 2103This function creates and returns the AnyEvent::TLS object used by default
1893for TLS mode. 2104for TLS mode.
1894 2105
… …
1925 2136
1926=item I get different callback invocations in TLS mode/Why can't I pause 2137=item I get different callback invocations in TLS mode/Why can't I pause
1927reading? 2138reading?
1928 2139
1929Unlike, say, TCP, TLS connections do not consist of two independent 2140Unlike, say, TCP, TLS connections do not consist of two independent
1930communication channels, one for each direction. Or put differently. The 2141communication channels, one for each direction. Or put differently, the
1931read and write directions are not independent of each other: you cannot 2142read and write directions are not independent of each other: you cannot
1932write data unless you are also prepared to read, and vice versa. 2143write data unless you are also prepared to read, and vice versa.
1933 2144
1934This can mean than, in TLS mode, you might get C<on_error> or C<on_eof> 2145This means that, in TLS mode, you might get C<on_error> or C<on_eof>
1935callback invocations when you are not expecting any read data - the reason 2146callback invocations when you are not expecting any read data - the reason
1936is that AnyEvent::Handle always reads in TLS mode. 2147is that AnyEvent::Handle always reads in TLS mode.
1937 2148
1938During the connection, you have to make sure that you always have a 2149During the connection, you have to make sure that you always have a
1939non-empty read-queue, or an C<on_read> watcher. At the end of the 2150non-empty read-queue, or an C<on_read> watcher. At the end of the
… …
1953 my $data = delete $_[0]{rbuf}; 2164 my $data = delete $_[0]{rbuf};
1954 }); 2165 });
1955 2166
1956The reason to use C<on_error> is that TCP connections, due to latencies 2167The reason to use C<on_error> is that TCP connections, due to latencies
1957and packets loss, might get closed quite violently with an error, when in 2168and packets loss, might get closed quite violently with an error, when in
1958fact, all data has been received. 2169fact all data has been received.
1959 2170
1960It is usually better to use acknowledgements when transferring data, 2171It is usually better to use acknowledgements when transferring data,
1961to make sure the other side hasn't just died and you got the data 2172to make sure the other side hasn't just died and you got the data
1962intact. This is also one reason why so many internet protocols have an 2173intact. This is also one reason why so many internet protocols have an
1963explicit QUIT command. 2174explicit QUIT command.
… …
1980consider using C<< ->push_shutdown >> instead. 2191consider using C<< ->push_shutdown >> instead.
1981 2192
1982=item I want to contact a TLS/SSL server, I don't care about security. 2193=item I want to contact a TLS/SSL server, I don't care about security.
1983 2194
1984If your TLS server is a pure TLS server (e.g. HTTPS) that only speaks TLS, 2195If your TLS server is a pure TLS server (e.g. HTTPS) that only speaks TLS,
1985simply connect to it and then create the AnyEvent::Handle with the C<tls> 2196connect to it and then create the AnyEvent::Handle with the C<tls>
1986parameter: 2197parameter:
1987 2198
1988 tcp_connect $host, $port, sub { 2199 tcp_connect $host, $port, sub {
1989 my ($fh) = @_; 2200 my ($fh) = @_;
1990 2201
… …
2090 2301
2091=item * all members not documented here and not prefixed with an underscore 2302=item * all members not documented here and not prefixed with an underscore
2092are free to use in subclasses. 2303are free to use in subclasses.
2093 2304
2094Of course, new versions of AnyEvent::Handle may introduce more "public" 2305Of course, new versions of AnyEvent::Handle may introduce more "public"
2095member variables, but thats just life, at least it is documented. 2306member variables, but that's just life. At least it is documented.
2096 2307
2097=back 2308=back
2098 2309
2099=head1 AUTHOR 2310=head1 AUTHOR
2100 2311

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