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Revision 1.165 by root, Mon Jul 27 22:49:23 2009 UTC vs.
Revision 1.205 by root, Mon Nov 15 17:11:00 2010 UTC

1package AnyEvent::Handle;
2
3use Scalar::Util ();
4use Carp ();
5use Errno qw(EAGAIN EINTR);
6
7use AnyEvent (); BEGIN { AnyEvent::common_sense }
8use AnyEvent::Util qw(WSAEWOULDBLOCK);
9
10=head1 NAME 1=head1 NAME
11 2
12AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent 3AnyEvent::Handle - non-blocking I/O on streaming handles via AnyEvent
13
14=cut
15
16our $VERSION = 4.87;
17 4
18=head1 SYNOPSIS 5=head1 SYNOPSIS
19 6
20 use AnyEvent; 7 use AnyEvent;
21 use AnyEvent::Handle; 8 use AnyEvent::Handle;
… …
27 on_error => sub { 14 on_error => sub {
28 my ($hdl, $fatal, $msg) = @_; 15 my ($hdl, $fatal, $msg) = @_;
29 warn "got error $msg\n"; 16 warn "got error $msg\n";
30 $hdl->destroy; 17 $hdl->destroy;
31 $cv->send; 18 $cv->send;
32 ); 19 };
33 20
34 # send some request line 21 # send some request line
35 $hdl->push_write ("getinfo\015\012"); 22 $hdl->push_write ("getinfo\015\012");
36 23
37 # read the response line 24 # read the response line
… …
43 30
44 $cv->recv; 31 $cv->recv;
45 32
46=head1 DESCRIPTION 33=head1 DESCRIPTION
47 34
48This 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
49filehandles. 36stream-based filehandles (sockets, pipes, and other stream things).
50 37
51The L<AnyEvent::Intro> tutorial contains some well-documented 38The L<AnyEvent::Intro> tutorial contains some well-documented
52AnyEvent::Handle examples. 39AnyEvent::Handle examples.
53 40
54In the following, when the documentation refers to of "bytes" then this 41In the following, where the documentation refers to "bytes", it means
55means characters. As sysread and syswrite are used for all I/O, their 42characters. As sysread and syswrite are used for all I/O, their
56treatment of characters applies to this module as well. 43treatment of characters applies to this module as well.
57 44
58At 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
59C<on_error> callback. 46C<on_error> callback.
60 47
61All callbacks will be invoked with the handle object as their first 48All callbacks will be invoked with the handle object as their first
62argument. 49argument.
63 50
51=cut
52
53package AnyEvent::Handle;
54
55use Scalar::Util ();
56use List::Util ();
57use Carp ();
58use Errno qw(EAGAIN EINTR);
59
60use AnyEvent (); BEGIN { AnyEvent::common_sense }
61use AnyEvent::Util qw(WSAEWOULDBLOCK);
62
63our $VERSION = $AnyEvent::VERSION;
64
65sub _load_func($) {
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
64=head1 METHODS 82=head1 METHODS
65 83
66=over 4 84=over 4
67 85
68=item $handle = B<new> AnyEvent::TLS fh => $filehandle, key => value... 86=item $handle = B<new> AnyEvent::Handle fh => $filehandle, key => value...
69 87
70The constructor supports these arguments (all as C<< key => value >> pairs). 88The constructor supports these arguments (all as C<< key => value >> pairs).
71 89
72=over 4 90=over 4
73 91
… …
102prepare the file handle with parameters required for the actual connect 120prepare the file handle with parameters required for the actual connect
103(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
104established). 122established).
105 123
106The 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
107seconds (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
108timeout is to be used). 126default timeout is to be used).
109 127
110=item on_connect => $cb->($handle, $host, $port, $retry->()) 128=item on_connect => $cb->($handle, $host, $port, $retry->())
111 129
112This callback is called when a connection has been successfully established. 130This callback is called when a connection has been successfully established.
113 131
114The actual numeric host and port (the socket peername) are passed as 132The peer's numeric host and port (the socket peername) are passed as
115parameters, together with a retry callback. 133parameters, together with a retry callback.
116 134
117When, for some reason, the handle is not acceptable, then calling 135If, for some reason, the handle is not acceptable, calling C<$retry>
118C<$retry> will continue with the next conenction target (in case of 136will continue with the next connection target (in case of multi-homed
119multi-homed hosts or SRV records there can be multiple connection 137hosts or SRV records there can be multiple connection endpoints). At the
120endpoints). When it is called then the read and write queues, eof status, 138time it is called the read and write queues, eof status, tls status and
121tls status and similar properties of the handle are being reset. 139similar properties of the handle will have been reset.
122 140
123In most cases, ignoring the C<$retry> parameter is the way to go. 141In most cases, you should ignore the C<$retry> parameter.
124 142
125=item on_connect_error => $cb->($handle, $message) 143=item on_connect_error => $cb->($handle, $message)
126 144
127This callback is called when the conenction could not be 145This callback is called when the connection could not be
128established. C<$!> will contain the relevant error code, and C<$message> a 146established. C<$!> will contain the relevant error code, and C<$message> a
129message describing it (usually the same as C<"$!">). 147message describing it (usually the same as C<"$!">).
130 148
131If 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
132fatal error instead. 150fatal error instead.
… …
135 153
136=item on_error => $cb->($handle, $fatal, $message) 154=item on_error => $cb->($handle, $fatal, $message)
137 155
138This is the error callback, which is called when, well, some error 156This is the error callback, which is called when, well, some error
139occured, such as not being able to resolve the hostname, failure to 157occured, such as not being able to resolve the hostname, failure to
140connect or a read error. 158connect, or a read error.
141 159
142Some errors are fatal (which is indicated by C<$fatal> being true). On 160Some errors are fatal (which is indicated by C<$fatal> being true). On
143fatal errors the handle object will be destroyed (by a call to C<< -> 161fatal errors the handle object will be destroyed (by a call to C<< ->
144destroy >>) after invoking the error callback (which means you are free to 162destroy >>) after invoking the error callback (which means you are free to
145examine the handle object). Examples of fatal errors are an EOF condition 163examine the handle object). Examples of fatal errors are an EOF condition
146with active (but unsatisifable) read watchers (C<EPIPE>) or I/O errors. In 164with active (but unsatisfiable) read watchers (C<EPIPE>) or I/O errors. In
147cases where the other side can close the connection at their will it is 165cases where the other side can close the connection at will, it is
148often easiest to not report C<EPIPE> errors in this callback. 166often easiest to not report C<EPIPE> errors in this callback.
149 167
150AnyEvent::Handle tries to find an appropriate error code for you to check 168AnyEvent::Handle tries to find an appropriate error code for you to check
151against, but in some cases (TLS errors), this does not work well. It is 169against, but in some cases (TLS errors), this does not work well. It is
152recommended to always output the C<$message> argument in human-readable 170recommended to always output the C<$message> argument in human-readable
153error messages (it's usually the same as C<"$!">). 171error messages (it's usually the same as C<"$!">).
154 172
155Non-fatal errors can be retried by simply returning, but it is recommended 173Non-fatal errors can be retried by returning, but it is recommended
156to simply ignore this parameter and instead abondon the handle object 174to simply ignore this parameter and instead abondon the handle object
157when this callback is invoked. Examples of non-fatal errors are timeouts 175when this callback is invoked. Examples of non-fatal errors are timeouts
158C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>). 176C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>).
159 177
160On callback entrance, the value of C<$!> contains the operating system 178On entry to the callback, the value of C<$!> contains the operating
161error code (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT>, C<EBADMSG> or 179system error code (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT>, C<EBADMSG> or
162C<EPROTO>). 180C<EPROTO>).
163 181
164While 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
165you will not be notified of errors otherwise. The default simply calls 183you will not be notified of errors otherwise. The default just calls
166C<croak>. 184C<croak>.
167 185
168=item on_read => $cb->($handle) 186=item on_read => $cb->($handle)
169 187
170This sets the default read callback, which is called when data arrives 188This sets the default read callback, which is called when data arrives
… …
175To 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 >>
176method or access the C<< $handle->{rbuf} >> member directly. Note that you 194method or access the C<< $handle->{rbuf} >> member directly. Note that you
177must not enlarge or modify the read buffer, you can only remove data at 195must not enlarge or modify the read buffer, you can only remove data at
178the beginning from it. 196the beginning from it.
179 197
198You can also call C<< ->push_read (...) >> or any other function that
199modifies the read queue. Or do both. Or ...
200
180When an EOF condition is detected then AnyEvent::Handle will first try to 201When an EOF condition is detected, AnyEvent::Handle will first try to
181feed all the remaining data to the queued callbacks and C<on_read> before 202feed all the remaining data to the queued callbacks and C<on_read> before
182calling the C<on_eof> callback. If no progress can be made, then a fatal 203calling the C<on_eof> callback. If no progress can be made, then a fatal
183error will be raised (with C<$!> set to C<EPIPE>). 204error will be raised (with C<$!> set to C<EPIPE>).
184 205
185Note that, unlike requests in the read queue, an C<on_read> callback 206Note that, unlike requests in the read queue, an C<on_read> callback
… …
204set, then a fatal error will be raised with C<$!> set to <0>. 225set, then a fatal error will be raised with C<$!> set to <0>.
205 226
206=item on_drain => $cb->($handle) 227=item on_drain => $cb->($handle)
207 228
208This 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
209(or when the callback is set and the buffer is empty already). 230(or immediately if the buffer is empty already).
210 231
211To append to the write buffer, use the C<< ->push_write >> method. 232To append to the write buffer, use the C<< ->push_write >> method.
212 233
213This 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
214into 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
… …
216memory and push it into the queue, but instead only read more data from 237memory and push it into the queue, but instead only read more data from
217the file when the write queue becomes empty. 238the file when the write queue becomes empty.
218 239
219=item timeout => $fractional_seconds 240=item timeout => $fractional_seconds
220 241
242=item rtimeout => $fractional_seconds
243
244=item wtimeout => $fractional_seconds
245
221If non-zero, then this enables an "inactivity" timeout: whenever this many 246If non-zero, then these enables an "inactivity" timeout: whenever this
222seconds pass without a successful read or write on the underlying file 247many seconds pass without a successful read or write on the underlying
223handle, the C<on_timeout> callback will be invoked (and if that one is 248file handle (or a call to C<timeout_reset>), the C<on_timeout> callback
224missing, a non-fatal C<ETIMEDOUT> error will be raised). 249will be invoked (and if that one is missing, a non-fatal C<ETIMEDOUT>
250error will be raised).
225 251
252There are three variants of the timeouts that work independently
253of each other, for both read and write, just read, and just write:
254C<timeout>, C<rtimeout> and C<wtimeout>, with corresponding callbacks
255C<on_timeout>, C<on_rtimeout> and C<on_wtimeout>, and reset functions
256C<timeout_reset>, C<rtimeout_reset>, and C<wtimeout_reset>.
257
226Note that timeout processing is also active when you currently do not have 258Note that timeout processing is active even when you do not have
227any 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
228idle then you should disable the timout temporarily or ignore the timeout 260idle then you should disable the timeout temporarily or ignore the timeout
229in 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
230restart the timeout. 262restart the timeout.
231 263
232Zero (the default) disables this timeout. 264Zero (the default) disables this timeout.
233 265
… …
249amount 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
250isn't finished). 282isn't finished).
251 283
252=item autocork => <boolean> 284=item autocork => <boolean>
253 285
254When disabled (the default), then C<push_write> will try to immediately 286When disabled (the default), C<push_write> will try to immediately
255write 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
256a 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
257be inefficient if you write multiple small chunks (on the wire, this 289be inefficient if you write multiple small chunks (on the wire, this
258disadvantage is usually avoided by your kernel's nagle algorithm, see 290disadvantage is usually avoided by your kernel's nagle algorithm, see
259C<no_delay>, but this option can save costly syscalls). 291C<no_delay>, but this option can save costly syscalls).
260 292
261When enabled, then writes will always be queued till the next event loop 293When enabled, writes will always be queued till the next event loop
262iteration. This is efficient when you do many small writes per iteration, 294iteration. This is efficient when you do many small writes per iteration,
263but 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
264the write buffer often is full). It also increases write latency. 296the write buffer often is full). It also increases write latency.
265 297
266=item no_delay => <boolean> 298=item no_delay => <boolean>
… …
270the Nagle algorithm, and usually it is beneficial. 302the Nagle algorithm, and usually it is beneficial.
271 303
272In 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
273accomplishd by setting this option to a true value. 305accomplishd by setting this option to a true value.
274 306
275The default is your opertaing system's default behaviour (most likely 307The default is your operating system's default behaviour (most likely
276enabled), 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.
277 341
278=item read_size => <bytes> 342=item read_size => <bytes>
279 343
280The 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
281try to read during each loop iteration, which affects memory 345read during each loop iteration. Each handle object will consume at least
282requirements). 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.
283 355
284=item low_water_mark => <bytes> 356=item low_water_mark => <bytes>
285 357
286Sets 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
287buffer: 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
288considered empty. 360considered empty.
289 361
290Sometimes it can be beneficial (for performance reasons) to add data to 362Sometimes it can be beneficial (for performance reasons) to add data to
291the 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
292the operating system kernel usually buffers data as well, so the default 364the operating system kernel usually buffers data as well, so the default
293is good in almost all cases. 365is good in almost all cases.
294 366
295=item linger => <seconds> 367=item linger => <seconds>
296 368
297If non-zero (default: C<3600>), then the destructor of the 369If this is non-zero (default: C<3600>), the destructor of the
298AnyEvent::Handle object will check whether there is still outstanding 370AnyEvent::Handle object will check whether there is still outstanding
299write 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
300socket. No errors will be reported (this mostly matches how the operating 372socket. No errors will be reported (this mostly matches how the operating
301system treats outstanding data at socket close time). 373system treats outstanding data at socket close time).
302 374
… …
309A string used to identify the remote site - usually the DNS hostname 381A string used to identify the remote site - usually the DNS hostname
310(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.
311 383
312Apart 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
313peername verification (see C<verify_peername> in L<AnyEvent::TLS>). This 385peername verification (see C<verify_peername> in L<AnyEvent::TLS>). This
314verification will be skipped when C<peername> is not specified or 386verification will be skipped when C<peername> is not specified or is
315C<undef>. 387C<undef>.
316 388
317=item tls => "accept" | "connect" | Net::SSLeay::SSL object 389=item tls => "accept" | "connect" | Net::SSLeay::SSL object
318 390
319When this parameter is given, it enables TLS (SSL) mode, that means 391When this parameter is given, it enables TLS (SSL) mode, that means
320AnyEvent 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
321established and will transparently encrypt/decrypt data afterwards. 393established and will transparently encrypt/decrypt data afterwards.
322 394
323All TLS protocol errors will be signalled as C<EPROTO>, with an 395All TLS protocol errors will be signalled as C<EPROTO>, with an
324appropriate error message. 396appropriate error message.
325 397
… …
345B<IMPORTANT:> since Net::SSLeay "objects" are really only integers, 417B<IMPORTANT:> since Net::SSLeay "objects" are really only integers,
346passing 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
347happens 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
348segmentation fault. 420segmentation fault.
349 421
350See 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.
351 423
352=item tls_ctx => $anyevent_tls 424=item tls_ctx => $anyevent_tls
353 425
354Use 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
355(unless a connection object was specified directly). If this parameter is 427(unless a connection object was specified directly). If this parameter is
… …
370 442
371TLS 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
372callback 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>.
373 445
374Without this callback, handshake failures lead to C<on_error> being 446Without this callback, handshake failures lead to C<on_error> being
375called, as normal. 447called as usual.
376 448
377Note 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
378need 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
379then call C<< ->starttls >> again. 451then call C<< ->starttls >> again.
380 452
381=item on_stoptls => $cb->($handle) 453=item on_stoptls => $cb->($handle)
382 454
… …
430 $self->{connect}[0], 502 $self->{connect}[0],
431 $self->{connect}[1], 503 $self->{connect}[1],
432 sub { 504 sub {
433 my ($fh, $host, $port, $retry) = @_; 505 my ($fh, $host, $port, $retry) = @_;
434 506
507 delete $self->{_connect};
508
435 if ($fh) { 509 if ($fh) {
436 $self->{fh} = $fh; 510 $self->{fh} = $fh;
437 511
438 delete $self->{_skip_drain_rbuf}; 512 delete $self->{_skip_drain_rbuf};
439 $self->_start; 513 $self->_start;
440 514
441 $self->{on_connect} 515 $self->{on_connect}
442 and $self->{on_connect}($self, $host, $port, sub { 516 and $self->{on_connect}($self, $host, $port, sub {
443 delete @$self{qw(fh _tw _ww _rw _eof _queue rbuf _wbuf tls _tls_rbuf _tls_wbuf)}; 517 delete @$self{qw(fh _tw _rtw _wtw _ww _rw _eof _queue rbuf _wbuf tls _tls_rbuf _tls_wbuf)};
444 $self->{_skip_drain_rbuf} = 1; 518 $self->{_skip_drain_rbuf} = 1;
445 &$retry; 519 &$retry;
446 }); 520 });
447 521
448 } else { 522 } else {
… …
472} 546}
473 547
474sub _start { 548sub _start {
475 my ($self) = @_; 549 my ($self) = @_;
476 550
551 # too many clueless people try to use udp and similar sockets
552 # with AnyEvent::Handle, do them a favour.
553 my $type = getsockopt $self->{fh}, Socket::SOL_SOCKET (), Socket::SO_TYPE ();
554 Carp::croak "AnyEvent::Handle: only stream sockets supported, anything else will NOT work!"
555 if Socket::SOCK_STREAM () != (unpack "I", $type) && defined $type;
556
477 AnyEvent::Util::fh_nonblocking $self->{fh}, 1; 557 AnyEvent::Util::fh_nonblocking $self->{fh}, 1;
478 558
559 $self->{_activity} =
560 $self->{_ractivity} =
479 $self->{_activity} = AnyEvent->now; 561 $self->{_wactivity} = AE::now;
480 $self->_timeout;
481 562
563 $self->{read_size} ||= 2048;
564 $self->{max_read_size} = $self->{read_size}
565 if $self->{read_size} > ($self->{max_read_size} || MAX_READ_SIZE);
566
567 $self->timeout (delete $self->{timeout} ) if $self->{timeout};
568 $self->rtimeout (delete $self->{rtimeout} ) if $self->{rtimeout};
569 $self->wtimeout (delete $self->{wtimeout} ) if $self->{wtimeout};
570
482 $self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay}; 571 $self->no_delay (delete $self->{no_delay} ) if exists $self->{no_delay} && $self->{no_delay};
572 $self->keepalive (delete $self->{keepalive}) if exists $self->{keepalive} && $self->{keepalive};
483 573
574 $self->oobinline (exists $self->{oobinline} ? delete $self->{oobinline} : 1);
575
484 $self->starttls (delete $self->{tls}, delete $self->{tls_ctx}) 576 $self->starttls (delete $self->{tls}, delete $self->{tls_ctx})
485 if $self->{tls}; 577 if $self->{tls};
486 578
487 $self->on_drain (delete $self->{on_drain}) if $self->{on_drain}; 579 $self->on_drain (delete $self->{on_drain} ) if $self->{on_drain};
488 580
489 $self->start_read 581 $self->start_read
490 if $self->{on_read} || @{ $self->{_queue} }; 582 if $self->{on_read} || @{ $self->{_queue} };
491 583
492 $self->_drain_wbuf; 584 $self->_drain_wbuf;
493} 585}
494
495#sub _shutdown {
496# my ($self) = @_;
497#
498# delete @$self{qw(_tw _rw _ww fh wbuf on_read _queue)};
499# $self->{_eof} = 1; # tell starttls et. al to stop trying
500#
501# &_freetls;
502#}
503 586
504sub _error { 587sub _error {
505 my ($self, $errno, $fatal, $message) = @_; 588 my ($self, $errno, $fatal, $message) = @_;
506 589
507 $! = $errno; 590 $! = $errno;
508 $message ||= "$!"; 591 $message ||= "$!";
509 592
510 if ($self->{on_error}) { 593 if ($self->{on_error}) {
511 $self->{on_error}($self, $fatal, $message); 594 $self->{on_error}($self, $fatal, $message);
512 $self->destroy if $fatal; 595 $self->destroy if $fatal;
513 } elsif ($self->{fh}) { 596 } elsif ($self->{fh} || $self->{connect}) {
514 $self->destroy; 597 $self->destroy;
515 Carp::croak "AnyEvent::Handle uncaught error: $message"; 598 Carp::croak "AnyEvent::Handle uncaught error: $message";
516 } 599 }
517} 600}
518 601
… …
544 $_[0]{on_eof} = $_[1]; 627 $_[0]{on_eof} = $_[1];
545} 628}
546 629
547=item $handle->on_timeout ($cb) 630=item $handle->on_timeout ($cb)
548 631
549Replace the current C<on_timeout> callback, or disables the callback (but 632=item $handle->on_rtimeout ($cb)
550not the timeout) if C<$cb> = C<undef>. See the C<timeout> constructor
551argument and method.
552 633
553=cut 634=item $handle->on_wtimeout ($cb)
554 635
555sub on_timeout { 636Replace the current C<on_timeout>, C<on_rtimeout> or C<on_wtimeout>
556 $_[0]{on_timeout} = $_[1]; 637callback, or disables the callback (but not the timeout) if C<$cb> =
557} 638C<undef>. See the C<timeout> constructor argument and method.
639
640=cut
641
642# see below
558 643
559=item $handle->autocork ($boolean) 644=item $handle->autocork ($boolean)
560 645
561Enables or disables the current autocork behaviour (see C<autocork> 646Enables or disables the current autocork behaviour (see C<autocork>
562constructor argument). Changes will only take effect on the next write. 647constructor argument). Changes will only take effect on the next write.
… …
575=cut 660=cut
576 661
577sub no_delay { 662sub no_delay {
578 $_[0]{no_delay} = $_[1]; 663 $_[0]{no_delay} = $_[1];
579 664
665 setsockopt $_[0]{fh}, Socket::IPPROTO_TCP (), Socket::TCP_NODELAY (), int $_[1]
666 if $_[0]{fh};
667}
668
669=item $handle->keepalive ($boolean)
670
671Enables or disables the C<keepalive> setting (see constructor argument of
672the same name for details).
673
674=cut
675
676sub keepalive {
677 $_[0]{keepalive} = $_[1];
678
580 eval { 679 eval {
581 local $SIG{__DIE__}; 680 local $SIG{__DIE__};
582 setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1] 681 setsockopt $_[0]{fh}, Socket::SOL_SOCKET (), Socket::SO_KEEPALIVE (), int $_[1]
583 if $_[0]{fh}; 682 if $_[0]{fh};
584 }; 683 };
585} 684}
586 685
686=item $handle->oobinline ($boolean)
687
688Enables or disables the C<oobinline> setting (see constructor argument of
689the same name for details).
690
691=cut
692
693sub oobinline {
694 $_[0]{oobinline} = $_[1];
695
696 eval {
697 local $SIG{__DIE__};
698 setsockopt $_[0]{fh}, Socket::SOL_SOCKET (), Socket::SO_OOBINLINE (), int $_[1]
699 if $_[0]{fh};
700 };
701}
702
703=item $handle->keepalive ($boolean)
704
705Enables or disables the C<keepalive> setting (see constructor argument of
706the same name for details).
707
708=cut
709
710sub keepalive {
711 $_[0]{keepalive} = $_[1];
712
713 eval {
714 local $SIG{__DIE__};
715 setsockopt $_[0]{fh}, Socket::SOL_SOCKET (), Socket::SO_KEEPALIVE (), int $_[1]
716 if $_[0]{fh};
717 };
718}
719
587=item $handle->on_starttls ($cb) 720=item $handle->on_starttls ($cb)
588 721
589Replace the current C<on_starttls> callback (see the C<on_starttls> constructor argument). 722Replace the current C<on_starttls> callback (see the C<on_starttls> constructor argument).
590 723
591=cut 724=cut
… …
598 731
599Replace the current C<on_stoptls> callback (see the C<on_stoptls> constructor argument). 732Replace the current C<on_stoptls> callback (see the C<on_stoptls> constructor argument).
600 733
601=cut 734=cut
602 735
603sub on_starttls { 736sub on_stoptls {
604 $_[0]{on_stoptls} = $_[1]; 737 $_[0]{on_stoptls} = $_[1];
605} 738}
606 739
740=item $handle->rbuf_max ($max_octets)
741
742Configures the C<rbuf_max> setting (C<undef> disables it).
743
744=cut
745
746sub rbuf_max {
747 $_[0]{rbuf_max} = $_[1];
748}
749
607############################################################################# 750#############################################################################
608 751
609=item $handle->timeout ($seconds) 752=item $handle->timeout ($seconds)
610 753
754=item $handle->rtimeout ($seconds)
755
756=item $handle->wtimeout ($seconds)
757
611Configures (or disables) the inactivity timeout. 758Configures (or disables) the inactivity timeout.
612 759
613=cut 760=item $handle->timeout_reset
614 761
615sub timeout { 762=item $handle->rtimeout_reset
763
764=item $handle->wtimeout_reset
765
766Reset the activity timeout, as if data was received or sent.
767
768These methods are cheap to call.
769
770=cut
771
772for my $dir ("", "r", "w") {
773 my $timeout = "${dir}timeout";
774 my $tw = "_${dir}tw";
775 my $on_timeout = "on_${dir}timeout";
776 my $activity = "_${dir}activity";
777 my $cb;
778
779 *$on_timeout = sub {
780 $_[0]{$on_timeout} = $_[1];
781 };
782
783 *$timeout = sub {
616 my ($self, $timeout) = @_; 784 my ($self, $new_value) = @_;
617 785
786 $new_value >= 0
787 or Carp::croak "AnyEvent::Handle->$timeout called with negative timeout ($new_value), caught";
788
618 $self->{timeout} = $timeout; 789 $self->{$timeout} = $new_value;
619 $self->_timeout; 790 delete $self->{$tw}; &$cb;
620} 791 };
621 792
793 *{"${dir}timeout_reset"} = sub {
794 $_[0]{$activity} = AE::now;
795 };
796
797 # main workhorse:
622# reset the timeout watcher, as neccessary 798 # reset the timeout watcher, as neccessary
623# also check for time-outs 799 # also check for time-outs
624sub _timeout { 800 $cb = sub {
625 my ($self) = @_; 801 my ($self) = @_;
626 802
627 if ($self->{timeout} && $self->{fh}) { 803 if ($self->{$timeout} && $self->{fh}) {
628 my $NOW = AnyEvent->now; 804 my $NOW = AE::now;
629 805
630 # when would the timeout trigger? 806 # when would the timeout trigger?
631 my $after = $self->{_activity} + $self->{timeout} - $NOW; 807 my $after = $self->{$activity} + $self->{$timeout} - $NOW;
632 808
633 # now or in the past already? 809 # now or in the past already?
634 if ($after <= 0) { 810 if ($after <= 0) {
635 $self->{_activity} = $NOW; 811 $self->{$activity} = $NOW;
636 812
637 if ($self->{on_timeout}) { 813 if ($self->{$on_timeout}) {
638 $self->{on_timeout}($self); 814 $self->{$on_timeout}($self);
639 } else { 815 } else {
640 $self->_error (Errno::ETIMEDOUT); 816 $self->_error (Errno::ETIMEDOUT);
817 }
818
819 # callback could have changed timeout value, optimise
820 return unless $self->{$timeout};
821
822 # calculate new after
823 $after = $self->{$timeout};
641 } 824 }
642 825
643 # callback could have changed timeout value, optimise 826 Scalar::Util::weaken $self;
644 return unless $self->{timeout}; 827 return unless $self; # ->error could have destroyed $self
645 828
646 # calculate new after 829 $self->{$tw} ||= AE::timer $after, 0, sub {
647 $after = $self->{timeout}; 830 delete $self->{$tw};
831 $cb->($self);
832 };
833 } else {
834 delete $self->{$tw};
648 } 835 }
649
650 Scalar::Util::weaken $self;
651 return unless $self; # ->error could have destroyed $self
652
653 $self->{_tw} ||= AnyEvent->timer (after => $after, cb => sub {
654 delete $self->{_tw};
655 $self->_timeout;
656 });
657 } else {
658 delete $self->{_tw};
659 } 836 }
660} 837}
661 838
662############################################################################# 839#############################################################################
663 840
… …
678 855
679=item $handle->on_drain ($cb) 856=item $handle->on_drain ($cb)
680 857
681Sets the C<on_drain> callback or clears it (see the description of 858Sets the C<on_drain> callback or clears it (see the description of
682C<on_drain> in the constructor). 859C<on_drain> in the constructor).
860
861This method may invoke callbacks (and therefore the handle might be
862destroyed after it returns).
683 863
684=cut 864=cut
685 865
686sub on_drain { 866sub on_drain {
687 my ($self, $cb) = @_; 867 my ($self, $cb) = @_;
… …
696 876
697Queues the given scalar to be written. You can push as much data as you 877Queues the given scalar to be written. You can push as much data as you
698want (only limited by the available memory), as C<AnyEvent::Handle> 878want (only limited by the available memory), as C<AnyEvent::Handle>
699buffers it independently of the kernel. 879buffers it independently of the kernel.
700 880
881This method may invoke callbacks (and therefore the handle might be
882destroyed after it returns).
883
701=cut 884=cut
702 885
703sub _drain_wbuf { 886sub _drain_wbuf {
704 my ($self) = @_; 887 my ($self) = @_;
705 888
… …
711 my $len = syswrite $self->{fh}, $self->{wbuf}; 894 my $len = syswrite $self->{fh}, $self->{wbuf};
712 895
713 if (defined $len) { 896 if (defined $len) {
714 substr $self->{wbuf}, 0, $len, ""; 897 substr $self->{wbuf}, 0, $len, "";
715 898
716 $self->{_activity} = AnyEvent->now; 899 $self->{_activity} = $self->{_wactivity} = AE::now;
717 900
718 $self->{on_drain}($self) 901 $self->{on_drain}($self)
719 if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf}) 902 if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf})
720 && $self->{on_drain}; 903 && $self->{on_drain};
721 904
… …
727 910
728 # try to write data immediately 911 # try to write data immediately
729 $cb->() unless $self->{autocork}; 912 $cb->() unless $self->{autocork};
730 913
731 # if still data left in wbuf, we need to poll 914 # if still data left in wbuf, we need to poll
732 $self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb) 915 $self->{_ww} = AE::io $self->{fh}, 1, $cb
733 if length $self->{wbuf}; 916 if length $self->{wbuf};
734 }; 917 };
735} 918}
736 919
737our %WH; 920our %WH;
738 921
922# deprecated
739sub register_write_type($$) { 923sub register_write_type($$) {
740 $WH{$_[0]} = $_[1]; 924 $WH{$_[0]} = $_[1];
741} 925}
742 926
743sub push_write { 927sub push_write {
744 my $self = shift; 928 my $self = shift;
745 929
746 if (@_ > 1) { 930 if (@_ > 1) {
747 my $type = shift; 931 my $type = shift;
748 932
933 @_ = ($WH{$type} ||= _load_func "$type\::anyevent_write_type"
749 @_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write") 934 or Carp::croak "unsupported/unloadable type '$type' passed to AnyEvent::Handle::push_write")
750 ->($self, @_); 935 ->($self, @_);
751 } 936 }
752 937
938 # we downgrade here to avoid hard-to-track-down bugs,
939 # and diagnose the problem earlier and better.
940
753 if ($self->{tls}) { 941 if ($self->{tls}) {
754 $self->{_tls_wbuf} .= $_[0]; 942 utf8::downgrade $self->{_tls_wbuf} .= $_[0];
755 &_dotls ($self) if $self->{fh}; 943 &_dotls ($self) if $self->{fh};
756 } else { 944 } else {
757 $self->{wbuf} .= $_[0]; 945 utf8::downgrade $self->{wbuf} .= $_[0];
758 $self->_drain_wbuf if $self->{fh}; 946 $self->_drain_wbuf if $self->{fh};
759 } 947 }
760} 948}
761 949
762=item $handle->push_write (type => @args) 950=item $handle->push_write (type => @args)
763 951
764Instead of formatting your data yourself, you can also let this module do 952Instead of formatting your data yourself, you can also let this module
765the job by specifying a type and type-specific arguments. 953do the job by specifying a type and type-specific arguments. You
954can also specify the (fully qualified) name of a package, in which
955case AnyEvent tries to load the package and then expects to find the
956C<anyevent_write_type> function inside (see "custom write types", below).
766 957
767Predefined types are (if you have ideas for additional types, feel free to 958Predefined types are (if you have ideas for additional types, feel free to
768drop by and tell us): 959drop by and tell us):
769 960
770=over 4 961=over 4
… …
827Other languages could read single lines terminated by a newline and pass 1018Other languages could read single lines terminated by a newline and pass
828this line into their JSON decoder of choice. 1019this line into their JSON decoder of choice.
829 1020
830=cut 1021=cut
831 1022
1023sub json_coder() {
1024 eval { require JSON::XS; JSON::XS->new->utf8 }
1025 || do { require JSON; JSON->new->utf8 }
1026}
1027
832register_write_type json => sub { 1028register_write_type json => sub {
833 my ($self, $ref) = @_; 1029 my ($self, $ref) = @_;
834 1030
835 require JSON; 1031 my $json = $self->{json} ||= json_coder;
836 1032
837 $self->{json} ? $self->{json}->encode ($ref) 1033 $json->encode ($ref)
838 : JSON::encode_json ($ref)
839}; 1034};
840 1035
841=item storable => $reference 1036=item storable => $reference
842 1037
843Freezes the given reference using L<Storable> and writes it to the 1038Freezes the given reference using L<Storable> and writes it to the
… …
869the peer. 1064the peer.
870 1065
871You can rely on the normal read queue and C<on_eof> handling 1066You can rely on the normal read queue and C<on_eof> handling
872afterwards. This is the cleanest way to close a connection. 1067afterwards. This is the cleanest way to close a connection.
873 1068
1069This method may invoke callbacks (and therefore the handle might be
1070destroyed after it returns).
1071
874=cut 1072=cut
875 1073
876sub push_shutdown { 1074sub push_shutdown {
877 my ($self) = @_; 1075 my ($self) = @_;
878 1076
879 delete $self->{low_water_mark}; 1077 delete $self->{low_water_mark};
880 $self->on_drain (sub { shutdown $_[0]{fh}, 1 }); 1078 $self->on_drain (sub { shutdown $_[0]{fh}, 1 });
881} 1079}
882 1080
883=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args) 1081=item custom write types - Package::anyevent_write_type $handle, @args
884 1082
885This function (not method) lets you add your own types to C<push_write>. 1083Instead of one of the predefined types, you can also specify the name of
1084a package. AnyEvent will try to load the package and then expects to find
1085a function named C<anyevent_write_type> inside. If it isn't found, it
1086progressively tries to load the parent package until it either finds the
1087function (good) or runs out of packages (bad).
1088
886Whenever the given C<type> is used, C<push_write> will invoke the code 1089Whenever the given C<type> is used, C<push_write> will the function with
887reference with the handle object and the remaining arguments. 1090the handle object and the remaining arguments.
888 1091
889The code reference is supposed to return a single octet string that will 1092The function is supposed to return a single octet string that will be
890be appended to the write buffer. 1093appended to the write buffer, so you cna mentally treat this function as a
1094"arguments to on-the-wire-format" converter.
891 1095
892Note that this is a function, and all types registered this way will be 1096Example: implement a custom write type C<join> that joins the remaining
893global, so try to use unique names. 1097arguments using the first one.
1098
1099 $handle->push_write (My::Type => " ", 1,2,3);
1100
1101 # uses the following package, which can be defined in the "My::Type" or in
1102 # the "My" modules to be auto-loaded, or just about anywhere when the
1103 # My::Type::anyevent_write_type is defined before invoking it.
1104
1105 package My::Type;
1106
1107 sub anyevent_write_type {
1108 my ($handle, $delim, @args) = @_;
1109
1110 join $delim, @args
1111 }
894 1112
895=cut 1113=cut
896 1114
897############################################################################# 1115#############################################################################
898 1116
… …
907ways, the "simple" way, using only C<on_read> and the "complex" way, using 1125ways, the "simple" way, using only C<on_read> and the "complex" way, using
908a queue. 1126a queue.
909 1127
910In the simple case, you just install an C<on_read> callback and whenever 1128In the simple case, you just install an C<on_read> callback and whenever
911new data arrives, it will be called. You can then remove some data (if 1129new data arrives, it will be called. You can then remove some data (if
912enough is there) from the read buffer (C<< $handle->rbuf >>). Or you cna 1130enough is there) from the read buffer (C<< $handle->rbuf >>). Or you can
913leave the data there if you want to accumulate more (e.g. when only a 1131leave the data there if you want to accumulate more (e.g. when only a
914partial message has been received so far). 1132partial message has been received so far), or change the read queue with
1133e.g. C<push_read>.
915 1134
916In the more complex case, you want to queue multiple callbacks. In this 1135In the more complex case, you want to queue multiple callbacks. In this
917case, AnyEvent::Handle will call the first queued callback each time new 1136case, AnyEvent::Handle will call the first queued callback each time new
918data arrives (also the first time it is queued) and removes it when it has 1137data arrives (also the first time it is queued) and remove it when it has
919done its job (see C<push_read>, below). 1138done its job (see C<push_read>, below).
920 1139
921This way you can, for example, push three line-reads, followed by reading 1140This way you can, for example, push three line-reads, followed by reading
922a chunk of data, and AnyEvent::Handle will execute them in order. 1141a chunk of data, and AnyEvent::Handle will execute them in order.
923 1142
… …
981 1200
982sub _drain_rbuf { 1201sub _drain_rbuf {
983 my ($self) = @_; 1202 my ($self) = @_;
984 1203
985 # avoid recursion 1204 # avoid recursion
986 return if exists $self->{_skip_drain_rbuf}; 1205 return if $self->{_skip_drain_rbuf};
987 local $self->{_skip_drain_rbuf} = 1; 1206 local $self->{_skip_drain_rbuf} = 1;
988
989 if (
990 defined $self->{rbuf_max}
991 && $self->{rbuf_max} < length $self->{rbuf}
992 ) {
993 $self->_error (Errno::ENOSPC, 1), return;
994 }
995 1207
996 while () { 1208 while () {
997 # we need to use a separate tls read buffer, as we must not receive data while 1209 # we need to use a separate tls read buffer, as we must not receive data while
998 # we are draining the buffer, and this can only happen with TLS. 1210 # we are draining the buffer, and this can only happen with TLS.
999 $self->{rbuf} .= delete $self->{_tls_rbuf} 1211 $self->{rbuf} .= delete $self->{_tls_rbuf}
… …
1041 : $self->_error (0, 1, "Unexpected end-of-file"); 1253 : $self->_error (0, 1, "Unexpected end-of-file");
1042 1254
1043 return; 1255 return;
1044 } 1256 }
1045 1257
1258 if (
1259 defined $self->{rbuf_max}
1260 && $self->{rbuf_max} < length $self->{rbuf}
1261 ) {
1262 $self->_error (Errno::ENOSPC, 1), return;
1263 }
1264
1046 # may need to restart read watcher 1265 # may need to restart read watcher
1047 unless ($self->{_rw}) { 1266 unless ($self->{_rw}) {
1048 $self->start_read 1267 $self->start_read
1049 if $self->{on_read} || @{ $self->{_queue} }; 1268 if $self->{on_read} || @{ $self->{_queue} };
1050 } 1269 }
… …
1054 1273
1055This replaces the currently set C<on_read> callback, or clears it (when 1274This replaces the currently set C<on_read> callback, or clears it (when
1056the new callback is C<undef>). See the description of C<on_read> in the 1275the new callback is C<undef>). See the description of C<on_read> in the
1057constructor. 1276constructor.
1058 1277
1278This method may invoke callbacks (and therefore the handle might be
1279destroyed after it returns).
1280
1059=cut 1281=cut
1060 1282
1061sub on_read { 1283sub on_read {
1062 my ($self, $cb) = @_; 1284 my ($self, $cb) = @_;
1063 1285
… …
1065 $self->_drain_rbuf if $cb; 1287 $self->_drain_rbuf if $cb;
1066} 1288}
1067 1289
1068=item $handle->rbuf 1290=item $handle->rbuf
1069 1291
1070Returns the read buffer (as a modifiable lvalue). 1292Returns the read buffer (as a modifiable lvalue). You can also access the
1293read buffer directly as the C<< ->{rbuf} >> member, if you want (this is
1294much faster, and no less clean).
1071 1295
1072You can access the read buffer directly as the C<< ->{rbuf} >> 1296The only operation allowed on the read buffer (apart from looking at it)
1073member, if you want. However, the only operation allowed on the 1297is removing data from its beginning. Otherwise modifying or appending to
1074read buffer (apart from looking at it) is removing data from its 1298it is not allowed and will lead to hard-to-track-down bugs.
1075beginning. Otherwise modifying or appending to it is not allowed and will
1076lead to hard-to-track-down bugs.
1077 1299
1078NOTE: The read buffer should only be used or modified if the C<on_read>, 1300NOTE: The read buffer should only be used or modified in the C<on_read>
1079C<push_read> or C<unshift_read> methods are used. The other read methods 1301callback or when C<push_read> or C<unshift_read> are used with a single
1080automatically manage the read buffer. 1302callback (i.e. untyped). Typed C<push_read> and C<unshift_read> methods
1303will manage the read buffer on their own.
1081 1304
1082=cut 1305=cut
1083 1306
1084sub rbuf : lvalue { 1307sub rbuf : lvalue {
1085 $_[0]{rbuf} 1308 $_[0]{rbuf}
… …
1102 1325
1103If enough data was available, then the callback must remove all data it is 1326If enough data was available, then the callback must remove all data it is
1104interested in (which can be none at all) and return a true value. After returning 1327interested in (which can be none at all) and return a true value. After returning
1105true, it will be removed from the queue. 1328true, it will be removed from the queue.
1106 1329
1330These methods may invoke callbacks (and therefore the handle might be
1331destroyed after it returns).
1332
1107=cut 1333=cut
1108 1334
1109our %RH; 1335our %RH;
1110 1336
1111sub register_read_type($$) { 1337sub register_read_type($$) {
… …
1117 my $cb = pop; 1343 my $cb = pop;
1118 1344
1119 if (@_) { 1345 if (@_) {
1120 my $type = shift; 1346 my $type = shift;
1121 1347
1348 $cb = ($RH{$type} ||= _load_func "$type\::anyevent_read_type"
1122 $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read") 1349 or Carp::croak "unsupported/unloadable type '$type' passed to AnyEvent::Handle::push_read")
1123 ->($self, $cb, @_); 1350 ->($self, $cb, @_);
1124 } 1351 }
1125 1352
1126 push @{ $self->{_queue} }, $cb; 1353 push @{ $self->{_queue} }, $cb;
1127 $self->_drain_rbuf; 1354 $self->_drain_rbuf;
… …
1132 my $cb = pop; 1359 my $cb = pop;
1133 1360
1134 if (@_) { 1361 if (@_) {
1135 my $type = shift; 1362 my $type = shift;
1136 1363
1364 $cb = ($RH{$type} ||= _load_func "$type\::anyevent_read_type"
1137 $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read") 1365 or Carp::croak "unsupported/unloadable type '$type' passed to AnyEvent::Handle::unshift_read")
1138 ->($self, $cb, @_); 1366 ->($self, $cb, @_);
1139 } 1367 }
1140
1141 1368
1142 unshift @{ $self->{_queue} }, $cb; 1369 unshift @{ $self->{_queue} }, $cb;
1143 $self->_drain_rbuf; 1370 $self->_drain_rbuf;
1144} 1371}
1145 1372
… …
1147 1374
1148=item $handle->unshift_read (type => @args, $cb) 1375=item $handle->unshift_read (type => @args, $cb)
1149 1376
1150Instead of providing a callback that parses the data itself you can chose 1377Instead of providing a callback that parses the data itself you can chose
1151between a number of predefined parsing formats, for chunks of data, lines 1378between a number of predefined parsing formats, for chunks of data, lines
1152etc. 1379etc. You can also specify the (fully qualified) name of a package, in
1380which case AnyEvent tries to load the package and then expects to find the
1381C<anyevent_read_type> function inside (see "custom read types", below).
1153 1382
1154Predefined types are (if you have ideas for additional types, feel free to 1383Predefined types are (if you have ideas for additional types, feel free to
1155drop by and tell us): 1384drop by and tell us):
1156 1385
1157=over 4 1386=over 4
… …
1249the receive buffer when neither C<$accept> nor C<$reject> match, 1478the receive buffer when neither C<$accept> nor C<$reject> match,
1250and everything preceding and including the match will be accepted 1479and everything preceding and including the match will be accepted
1251unconditionally. This is useful to skip large amounts of data that you 1480unconditionally. This is useful to skip large amounts of data that you
1252know cannot be matched, so that the C<$accept> or C<$reject> regex do not 1481know cannot be matched, so that the C<$accept> or C<$reject> regex do not
1253have to start matching from the beginning. This is purely an optimisation 1482have to start matching from the beginning. This is purely an optimisation
1254and is usually worth only when you expect more than a few kilobytes. 1483and is usually worth it only when you expect more than a few kilobytes.
1255 1484
1256Example: expect a http header, which ends at C<\015\012\015\012>. Since we 1485Example: expect a http header, which ends at C<\015\012\015\012>. Since we
1257expect the header to be very large (it isn't in practise, but...), we use 1486expect the header to be very large (it isn't in practice, but...), we use
1258a skip regex to skip initial portions. The skip regex is tricky in that 1487a skip regex to skip initial portions. The skip regex is tricky in that
1259it only accepts something not ending in either \015 or \012, as these are 1488it only accepts something not ending in either \015 or \012, as these are
1260required for the accept regex. 1489required for the accept regex.
1261 1490
1262 $handle->push_read (regex => 1491 $handle->push_read (regex =>
… …
1397=cut 1626=cut
1398 1627
1399register_read_type json => sub { 1628register_read_type json => sub {
1400 my ($self, $cb) = @_; 1629 my ($self, $cb) = @_;
1401 1630
1402 my $json = $self->{json} ||= 1631 my $json = $self->{json} ||= json_coder;
1403 eval { require JSON::XS; JSON::XS->new->utf8 }
1404 || do { require JSON; JSON->new->utf8 };
1405 1632
1406 my $data; 1633 my $data;
1407 my $rbuf = \$self->{rbuf}; 1634 my $rbuf = \$self->{rbuf};
1408 1635
1409 sub { 1636 sub {
… …
1478 } 1705 }
1479}; 1706};
1480 1707
1481=back 1708=back
1482 1709
1483=item AnyEvent::Handle::register_read_type type => $coderef->($handle, $cb, @args) 1710=item custom read types - Package::anyevent_read_type $handle, $cb, @args
1484 1711
1485This function (not method) lets you add your own types to C<push_read>. 1712Instead of one of the predefined types, you can also specify the name
1713of a package. AnyEvent will try to load the package and then expects to
1714find a function named C<anyevent_read_type> inside. If it isn't found, it
1715progressively tries to load the parent package until it either finds the
1716function (good) or runs out of packages (bad).
1486 1717
1487Whenever the given C<type> is used, C<push_read> will invoke the code 1718Whenever this type is used, C<push_read> will invoke the function with the
1488reference with the handle object, the callback and the remaining 1719handle object, the original callback and the remaining arguments.
1489arguments.
1490 1720
1491The code reference is supposed to return a callback (usually a closure) 1721The function is supposed to return a callback (usually a closure) that
1492that works as a plain read callback (see C<< ->push_read ($cb) >>). 1722works as a plain read callback (see C<< ->push_read ($cb) >>), so you can
1723mentally treat the function as a "configurable read type to read callback"
1724converter.
1493 1725
1494It should invoke the passed callback when it is done reading (remember to 1726It should invoke the original callback when it is done reading (remember
1495pass C<$handle> as first argument as all other callbacks do that). 1727to pass C<$handle> as first argument as all other callbacks do that,
1728although there is no strict requirement on this).
1496 1729
1497Note that this is a function, and all types registered this way will be
1498global, so try to use unique names.
1499
1500For examples, see the source of this module (F<perldoc -m AnyEvent::Handle>, 1730For examples, see the source of this module (F<perldoc -m
1501search for C<register_read_type>)). 1731AnyEvent::Handle>, search for C<register_read_type>)).
1502 1732
1503=item $handle->stop_read 1733=item $handle->stop_read
1504 1734
1505=item $handle->start_read 1735=item $handle->start_read
1506 1736
… …
1526} 1756}
1527 1757
1528sub start_read { 1758sub start_read {
1529 my ($self) = @_; 1759 my ($self) = @_;
1530 1760
1531 unless ($self->{_rw} || $self->{_eof}) { 1761 unless ($self->{_rw} || $self->{_eof} || !$self->{fh}) {
1532 Scalar::Util::weaken $self; 1762 Scalar::Util::weaken $self;
1533 1763
1534 $self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub { 1764 $self->{_rw} = AE::io $self->{fh}, 0, sub {
1535 my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf}); 1765 my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});
1536 my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf; 1766 my $len = sysread $self->{fh}, $$rbuf, $self->{read_size}, length $$rbuf;
1537 1767
1538 if ($len > 0) { 1768 if ($len > 0) {
1539 $self->{_activity} = AnyEvent->now; 1769 $self->{_activity} = $self->{_ractivity} = AE::now;
1540 1770
1541 if ($self->{tls}) { 1771 if ($self->{tls}) {
1542 Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf); 1772 Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);
1543 1773
1544 &_dotls ($self); 1774 &_dotls ($self);
1545 } else { 1775 } else {
1546 $self->_drain_rbuf; 1776 $self->_drain_rbuf;
1547 } 1777 }
1548 1778
1779 if ($len == $self->{read_size}) {
1780 $self->{read_size} *= 2;
1781 $self->{read_size} = $self->{max_read_size} || MAX_READ_SIZE
1782 if $self->{read_size} > ($self->{max_read_size} || MAX_READ_SIZE);
1783 }
1784
1549 } elsif (defined $len) { 1785 } elsif (defined $len) {
1550 delete $self->{_rw}; 1786 delete $self->{_rw};
1551 $self->{_eof} = 1; 1787 $self->{_eof} = 1;
1552 $self->_drain_rbuf; 1788 $self->_drain_rbuf;
1553 1789
1554 } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) { 1790 } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
1555 return $self->_error ($!, 1); 1791 return $self->_error ($!, 1);
1556 } 1792 }
1557 }); 1793 };
1558 } 1794 }
1559} 1795}
1560 1796
1561our $ERROR_SYSCALL; 1797our $ERROR_SYSCALL;
1562our $ERROR_WANT_READ; 1798our $ERROR_WANT_READ;
… …
1629 && ($tmp != $ERROR_SYSCALL || $!); 1865 && ($tmp != $ERROR_SYSCALL || $!);
1630 1866
1631 while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) { 1867 while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) {
1632 $self->{wbuf} .= $tmp; 1868 $self->{wbuf} .= $tmp;
1633 $self->_drain_wbuf; 1869 $self->_drain_wbuf;
1870 $self->{tls} or return; # tls session might have gone away in callback
1634 } 1871 }
1635 1872
1636 $self->{_on_starttls} 1873 $self->{_on_starttls}
1637 and Net::SSLeay::state ($self->{tls}) == Net::SSLeay::ST_OK () 1874 and Net::SSLeay::state ($self->{tls}) == Net::SSLeay::ST_OK ()
1638 and (delete $self->{_on_starttls})->($self, 1, "TLS/SSL connection established"); 1875 and (delete $self->{_on_starttls})->($self, 1, "TLS/SSL connection established");
… …
1660context in C<< $handle->{tls_ctx} >> after this call and can be used or 1897context in C<< $handle->{tls_ctx} >> after this call and can be used or
1661changed to your liking. Note that the handshake might have already started 1898changed to your liking. Note that the handshake might have already started
1662when this function returns. 1899when this function returns.
1663 1900
1664Due to bugs in OpenSSL, it might or might not be possible to do multiple 1901Due to bugs in OpenSSL, it might or might not be possible to do multiple
1665handshakes on the same stream. Best do not attempt to use the stream after 1902handshakes on the same stream. It is best to not attempt to use the
1666stopping TLS. 1903stream after stopping TLS.
1904
1905This method may invoke callbacks (and therefore the handle might be
1906destroyed after it returns).
1667 1907
1668=cut 1908=cut
1669 1909
1670our %TLS_CACHE; #TODO not yet documented, should we? 1910our %TLS_CACHE; #TODO not yet documented, should we?
1671 1911
… …
1683 require Net::SSLeay; 1923 require Net::SSLeay;
1684 1924
1685 $ERROR_SYSCALL = Net::SSLeay::ERROR_SYSCALL (); 1925 $ERROR_SYSCALL = Net::SSLeay::ERROR_SYSCALL ();
1686 $ERROR_WANT_READ = Net::SSLeay::ERROR_WANT_READ (); 1926 $ERROR_WANT_READ = Net::SSLeay::ERROR_WANT_READ ();
1687 1927
1688 $tls = $self->{tls}; 1928 $tls = delete $self->{tls};
1689 $ctx = $self->{tls_ctx}; 1929 $ctx = $self->{tls_ctx};
1690 1930
1691 local $Carp::CarpLevel = 1; # skip ourselves when creating a new context or session 1931 local $Carp::CarpLevel = 1; # skip ourselves when creating a new context or session
1692 1932
1693 if ("HASH" eq ref $ctx) { 1933 if ("HASH" eq ref $ctx) {
… …
1722 Net::SSLeay::CTX_set_mode ($tls, 1|2); 1962 Net::SSLeay::CTX_set_mode ($tls, 1|2);
1723 1963
1724 $self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); 1964 $self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1725 $self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); 1965 $self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1726 1966
1967 Net::SSLeay::BIO_write ($self->{_rbio}, delete $self->{rbuf});
1968
1727 Net::SSLeay::set_bio ($tls, $self->{_rbio}, $self->{_wbio}); 1969 Net::SSLeay::set_bio ($tls, $self->{_rbio}, $self->{_wbio});
1728 1970
1729 $self->{_on_starttls} = sub { $_[0]{on_starttls}(@_) } 1971 $self->{_on_starttls} = sub { $_[0]{on_starttls}(@_) }
1730 if $self->{on_starttls}; 1972 if $self->{on_starttls};
1731 1973
… …
1735 1977
1736=item $handle->stoptls 1978=item $handle->stoptls
1737 1979
1738Shuts down the SSL connection - this makes a proper EOF handshake by 1980Shuts down the SSL connection - this makes a proper EOF handshake by
1739sending a close notify to the other side, but since OpenSSL doesn't 1981sending a close notify to the other side, but since OpenSSL doesn't
1740support non-blocking shut downs, it is not guarenteed that you can re-use 1982support non-blocking shut downs, it is not guaranteed that you can re-use
1741the stream afterwards. 1983the stream afterwards.
1984
1985This method may invoke callbacks (and therefore the handle might be
1986destroyed after it returns).
1742 1987
1743=cut 1988=cut
1744 1989
1745sub stoptls { 1990sub stoptls {
1746 my ($self) = @_; 1991 my ($self) = @_;
1747 1992
1748 if ($self->{tls}) { 1993 if ($self->{tls} && $self->{fh}) {
1749 Net::SSLeay::shutdown ($self->{tls}); 1994 Net::SSLeay::shutdown ($self->{tls});
1750 1995
1751 &_dotls; 1996 &_dotls;
1752 1997
1753# # we don't give a shit. no, we do, but we can't. no...#d# 1998# # we don't give a shit. no, we do, but we can't. no...#d#
… …
1760 my ($self) = @_; 2005 my ($self) = @_;
1761 2006
1762 return unless $self->{tls}; 2007 return unless $self->{tls};
1763 2008
1764 $self->{tls_ctx}->_put_session (delete $self->{tls}) 2009 $self->{tls_ctx}->_put_session (delete $self->{tls})
1765 if ref $self->{tls}; 2010 if $self->{tls} > 0;
1766 2011
1767 delete @$self{qw(_rbio _wbio _tls_wbuf _on_starttls)}; 2012 delete @$self{qw(_rbio _wbio _tls_wbuf _on_starttls)};
1768} 2013}
1769 2014
1770sub DESTROY { 2015sub DESTROY {
… …
1778 my $fh = delete $self->{fh}; 2023 my $fh = delete $self->{fh};
1779 my $wbuf = delete $self->{wbuf}; 2024 my $wbuf = delete $self->{wbuf};
1780 2025
1781 my @linger; 2026 my @linger;
1782 2027
1783 push @linger, AnyEvent->io (fh => $fh, poll => "w", cb => sub { 2028 push @linger, AE::io $fh, 1, sub {
1784 my $len = syswrite $fh, $wbuf, length $wbuf; 2029 my $len = syswrite $fh, $wbuf, length $wbuf;
1785 2030
1786 if ($len > 0) { 2031 if ($len > 0) {
1787 substr $wbuf, 0, $len, ""; 2032 substr $wbuf, 0, $len, "";
1788 } else { 2033 } elsif (defined $len || ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK)) {
1789 @linger = (); # end 2034 @linger = (); # end
1790 } 2035 }
1791 }); 2036 };
1792 push @linger, AnyEvent->timer (after => $linger, cb => sub { 2037 push @linger, AE::timer $linger, 0, sub {
1793 @linger = (); 2038 @linger = ();
1794 }); 2039 };
1795 } 2040 }
1796} 2041}
1797 2042
1798=item $handle->destroy 2043=item $handle->destroy
1799 2044
… …
1830 2075
1831sub AnyEvent::Handle::destroyed::AUTOLOAD { 2076sub AnyEvent::Handle::destroyed::AUTOLOAD {
1832 #nop 2077 #nop
1833} 2078}
1834 2079
2080=item $handle->destroyed
2081
2082Returns false as long as the handle hasn't been destroyed by a call to C<<
2083->destroy >>, true otherwise.
2084
2085Can be useful to decide whether the handle is still valid after some
2086callback possibly destroyed the handle. For example, C<< ->push_write >>,
2087C<< ->starttls >> and other methods can call user callbacks, which in turn
2088can destroy the handle, so work can be avoided by checking sometimes:
2089
2090 $hdl->starttls ("accept");
2091 return if $hdl->destroyed;
2092 $hdl->push_write (...
2093
2094Note that the call to C<push_write> will silently be ignored if the handle
2095has been destroyed, so often you can just ignore the possibility of the
2096handle being destroyed.
2097
2098=cut
2099
2100sub destroyed { 0 }
2101sub AnyEvent::Handle::destroyed::destroyed { 1 }
2102
1835=item AnyEvent::Handle::TLS_CTX 2103=item AnyEvent::Handle::TLS_CTX
1836 2104
1837This function creates and returns the AnyEvent::TLS object used by default 2105This function creates and returns the AnyEvent::TLS object used by default
1838for TLS mode. 2106for TLS mode.
1839 2107
… …
1870 2138
1871=item I get different callback invocations in TLS mode/Why can't I pause 2139=item I get different callback invocations in TLS mode/Why can't I pause
1872reading? 2140reading?
1873 2141
1874Unlike, say, TCP, TLS connections do not consist of two independent 2142Unlike, say, TCP, TLS connections do not consist of two independent
1875communication channels, one for each direction. Or put differently. The 2143communication channels, one for each direction. Or put differently, the
1876read and write directions are not independent of each other: you cannot 2144read and write directions are not independent of each other: you cannot
1877write data unless you are also prepared to read, and vice versa. 2145write data unless you are also prepared to read, and vice versa.
1878 2146
1879This can mean than, in TLS mode, you might get C<on_error> or C<on_eof> 2147This means that, in TLS mode, you might get C<on_error> or C<on_eof>
1880callback invocations when you are not expecting any read data - the reason 2148callback invocations when you are not expecting any read data - the reason
1881is that AnyEvent::Handle always reads in TLS mode. 2149is that AnyEvent::Handle always reads in TLS mode.
1882 2150
1883During the connection, you have to make sure that you always have a 2151During the connection, you have to make sure that you always have a
1884non-empty read-queue, or an C<on_read> watcher. At the end of the 2152non-empty read-queue, or an C<on_read> watcher. At the end of the
… …
1898 my $data = delete $_[0]{rbuf}; 2166 my $data = delete $_[0]{rbuf};
1899 }); 2167 });
1900 2168
1901The reason to use C<on_error> is that TCP connections, due to latencies 2169The reason to use C<on_error> is that TCP connections, due to latencies
1902and packets loss, might get closed quite violently with an error, when in 2170and packets loss, might get closed quite violently with an error, when in
1903fact, all data has been received. 2171fact all data has been received.
1904 2172
1905It is usually better to use acknowledgements when transferring data, 2173It is usually better to use acknowledgements when transferring data,
1906to make sure the other side hasn't just died and you got the data 2174to make sure the other side hasn't just died and you got the data
1907intact. This is also one reason why so many internet protocols have an 2175intact. This is also one reason why so many internet protocols have an
1908explicit QUIT command. 2176explicit QUIT command.
… …
1925consider using C<< ->push_shutdown >> instead. 2193consider using C<< ->push_shutdown >> instead.
1926 2194
1927=item I want to contact a TLS/SSL server, I don't care about security. 2195=item I want to contact a TLS/SSL server, I don't care about security.
1928 2196
1929If your TLS server is a pure TLS server (e.g. HTTPS) that only speaks TLS, 2197If your TLS server is a pure TLS server (e.g. HTTPS) that only speaks TLS,
1930simply connect to it and then create the AnyEvent::Handle with the C<tls> 2198connect to it and then create the AnyEvent::Handle with the C<tls>
1931parameter: 2199parameter:
1932 2200
1933 tcp_connect $host, $port, sub { 2201 tcp_connect $host, $port, sub {
1934 my ($fh) = @_; 2202 my ($fh) = @_;
1935 2203
… …
2035 2303
2036=item * all members not documented here and not prefixed with an underscore 2304=item * all members not documented here and not prefixed with an underscore
2037are free to use in subclasses. 2305are free to use in subclasses.
2038 2306
2039Of course, new versions of AnyEvent::Handle may introduce more "public" 2307Of course, new versions of AnyEvent::Handle may introduce more "public"
2040member variables, but thats just life, at least it is documented. 2308member variables, but that's just life. At least it is documented.
2041 2309
2042=back 2310=back
2043 2311
2044=head1 AUTHOR 2312=head1 AUTHOR
2045 2313

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