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Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.362 by root, Sun Aug 14 01:57:18 2011 UTC vs.
Revision 1.383 by root, Fri Sep 2 04:41:16 2011 UTC

1=head1 NAME 1=head1 NAME
2 2
3AnyEvent - the DBI of event loop programming 3AnyEvent - the DBI of event loop programming
4 4
5EV, Event, Glib, Tk, Perl, Event::Lib, Irssi, rxvt-unicode, IO::Async, Qt 5EV, Event, Glib, Tk, Perl, Event::Lib, Irssi, rxvt-unicode, IO::Async, Qt,
6and POE are various supported event loops/environments. 6FLTK and POE are various supported event loops/environments.
7 7
8=head1 SYNOPSIS 8=head1 SYNOPSIS
9 9
10 use AnyEvent; 10 use AnyEvent;
11 11
… …
878 AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse. 878 AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse.
879 AnyEvent::Impl::POE based on POE, very slow, some limitations. 879 AnyEvent::Impl::POE based on POE, very slow, some limitations.
880 AnyEvent::Impl::Irssi used when running within irssi. 880 AnyEvent::Impl::Irssi used when running within irssi.
881 AnyEvent::Impl::IOAsync based on IO::Async. 881 AnyEvent::Impl::IOAsync based on IO::Async.
882 AnyEvent::Impl::Cocoa based on Cocoa::EventLoop. 882 AnyEvent::Impl::Cocoa based on Cocoa::EventLoop.
883 AnyEvent::Impl::FLTK2 based on FLTK (fltk 2 binding). 883 AnyEvent::Impl::FLTK based on FLTK (fltk 2 binding).
884 884
885=item Backends with special needs. 885=item Backends with special needs.
886 886
887Qt requires the Qt::Application to be instantiated first, but will 887Qt requires the Qt::Application to be instantiated first, but will
888otherwise be picked up automatically. As long as the main program 888otherwise be picked up automatically. As long as the main program
… …
1049It should use C<postpone>: 1049It should use C<postpone>:
1050 1050
1051 AnyEvent::postpone { $cb->(undef) }, return # signal error to callback, later 1051 AnyEvent::postpone { $cb->(undef) }, return # signal error to callback, later
1052 if $some_error_condition; 1052 if $some_error_condition;
1053 1053
1054=item AnyEvent::log $level, $msg[, @args]
1055
1056Log the given C<$msg> at the given C<$level>.
1057
1058If L<AnyEvent::Log> is not loaded then this function makes a simple test
1059to see whether the message will be logged. If the test succeeds it will
1060load AnyEvent::Log and call C<AnyEvent::Log::log> - consequently, look at
1061the L<AnyEvent::Log> documentation for details.
1062
1063If the test fails it will simply return. Right now this happens when a
1064numerical loglevel is used and it is larger than the level specified via
1065C<$ENV{PERL_ANYEVENT_VERBOSE}>.
1066
1067If you want to sprinkle loads of logging calls around your code, consider
1068creating a logger callback with the C<AnyEvent::Log::logger> function,
1069which can reduce typing, codesize and can reduce the logging overhead
1070enourmously.
1071
1054=back 1072=back
1055 1073
1056=head1 WHAT TO DO IN A MODULE 1074=head1 WHAT TO DO IN A MODULE
1057 1075
1058As a module author, you should C<use AnyEvent> and call AnyEvent methods 1076As a module author, you should C<use AnyEvent> and call AnyEvent methods
… …
1114 1132
1115 1133
1116=head1 OTHER MODULES 1134=head1 OTHER MODULES
1117 1135
1118The following is a non-exhaustive list of additional modules that use 1136The following is a non-exhaustive list of additional modules that use
1119AnyEvent as a client and can therefore be mixed easily with other AnyEvent 1137AnyEvent as a client and can therefore be mixed easily with other
1120modules and other event loops in the same program. Some of the modules 1138AnyEvent modules and other event loops in the same program. Some of the
1121come as part of AnyEvent, the others are available via CPAN. 1139modules come as part of AnyEvent, the others are available via CPAN (see
1140L<http://search.cpan.org/search?m=module&q=anyevent%3A%3A*> for
1141a longer non-exhaustive list), and the list is heavily biased towards
1142modules of the AnyEvent author himself :)
1122 1143
1123=over 4 1144=over 4
1124 1145
1125=item L<AnyEvent::Util> 1146=item L<AnyEvent::Util>
1126 1147
… …
1146=item L<AnyEvent::HTTP>, L<AnyEvent::IRC>, L<AnyEvent::XMPP>, L<AnyEvent::GPSD>, L<AnyEvent::IGS>, L<AnyEvent::FCP> 1167=item L<AnyEvent::HTTP>, L<AnyEvent::IRC>, L<AnyEvent::XMPP>, L<AnyEvent::GPSD>, L<AnyEvent::IGS>, L<AnyEvent::FCP>
1147 1168
1148Implement event-based interfaces to the protocols of the same name (for 1169Implement event-based interfaces to the protocols of the same name (for
1149the curious, IGS is the International Go Server and FCP is the Freenet 1170the curious, IGS is the International Go Server and FCP is the Freenet
1150Client Protocol). 1171Client Protocol).
1151
1152=item L<AnyEvent::Handle::UDP>
1153
1154Here be danger!
1155
1156As Pauli would put it, "Not only is it not right, it's not even wrong!" -
1157there are so many things wrong with AnyEvent::Handle::UDP, most notably
1158its use of a stream-based API with a protocol that isn't streamable, that
1159the only way to improve it is to delete it.
1160
1161It features data corruption (but typically only under load) and general
1162confusion. On top, the author is not only clueless about UDP but also
1163fact-resistant - some gems of his understanding: "connect doesn't work
1164with UDP", "UDP packets are not IP packets", "UDP only has datagrams, not
1165packets", "I don't need to implement proper error checking as UDP doesn't
1166support error checking" and so on - he doesn't even understand what's
1167wrong with his module when it is explained to him.
1168
1169=item L<AnyEvent::DBI>
1170
1171Executes L<DBI> requests asynchronously in a proxy process for you,
1172notifying you in an event-based way when the operation is finished.
1173 1172
1174=item L<AnyEvent::AIO> 1173=item L<AnyEvent::AIO>
1175 1174
1176Truly asynchronous (as opposed to non-blocking) I/O, should be in the 1175Truly asynchronous (as opposed to non-blocking) I/O, should be in the
1177toolbox of every event programmer. AnyEvent::AIO transparently fuses 1176toolbox of every event programmer. AnyEvent::AIO transparently fuses
1178L<IO::AIO> and AnyEvent together, giving AnyEvent access to event-based 1177L<IO::AIO> and AnyEvent together, giving AnyEvent access to event-based
1179file I/O, and much more. 1178file I/O, and much more.
1180 1179
1180=item L<AnyEvent::Filesys::Notify>
1181
1182AnyEvent is good for non-blocking stuff, but it can't detect file or
1183path changes (e.g. "watch this directory for new files", "watch this
1184file for changes"). The L<AnyEvent::Filesys::Notify> module promises to
1185do just that in a portbale fashion, supporting inotify on GNU/Linux and
1186some weird, without doubt broken, stuff on OS X to monitor files. It can
1187fall back to blocking scans at regular intervals transparently on other
1188platforms, so it's about as portable as it gets.
1189
1190(I haven't used it myself, but I haven't heard anybody complaining about
1191it yet).
1192
1193=item L<AnyEvent::DBI>
1194
1195Executes L<DBI> requests asynchronously in a proxy process for you,
1196notifying you in an event-based way when the operation is finished.
1197
1181=item L<AnyEvent::HTTPD> 1198=item L<AnyEvent::HTTPD>
1182 1199
1183A simple embedded webserver. 1200A simple embedded webserver.
1184 1201
1185=item L<AnyEvent::FastPing> 1202=item L<AnyEvent::FastPing>
1186 1203
1187The fastest ping in the west. 1204The fastest ping in the west.
1188 1205
1189=item L<Coro> 1206=item L<Coro>
1190 1207
1191Has special support for AnyEvent via L<Coro::AnyEvent>. 1208Has special support for AnyEvent via L<Coro::AnyEvent>, which allows you
1209to simply invert the flow control - don't call us, we will call you:
1210
1211 async {
1212 Coro::AnyEvent::sleep 5; # creates a 5s timer and waits for it
1213 print "5 seconds later!\n";
1214
1215 Coro::AnyEvent::readable *STDIN; # uses an I/O watcher
1216 my $line = <STDIN>; # works for ttys
1217
1218 AnyEvent::HTTP::http_get "url", Coro::rouse_cb;
1219 my ($body, $hdr) = Coro::rouse_wait;
1220 };
1192 1221
1193=back 1222=back
1194 1223
1195=cut 1224=cut
1196 1225
… …
1206 1235
1207BEGIN { AnyEvent::common_sense } 1236BEGIN { AnyEvent::common_sense }
1208 1237
1209use Carp (); 1238use Carp ();
1210 1239
1211our $VERSION = '6.01'; 1240our $VERSION = '6.02';
1212our $MODEL; 1241our $MODEL;
1213
1214our @ISA; 1242our @ISA;
1215
1216our @REGISTRY; 1243our @REGISTRY;
1217
1218our $VERBOSE; 1244our $VERBOSE;
1245our $MAX_SIGNAL_LATENCY = 10;
1246our %PROTOCOL; # (ipv4|ipv6) => (1|2), higher numbers are preferred
1219 1247
1220BEGIN { 1248BEGIN {
1221 require "AnyEvent/constants.pl"; 1249 require "AnyEvent/constants.pl";
1222 1250
1223 eval "sub TAINT (){" . (${^TAINT}*1) . "}"; 1251 eval "sub TAINT (){" . (${^TAINT}*1) . "}";
1224 1252
1225 delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV} 1253 delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV}
1226 if ${^TAINT}; 1254 if ${^TAINT};
1227 1255
1228 $VERBOSE = $ENV{PERL_ANYEVENT_VERBOSE}*1; 1256 $ENV{"PERL_ANYEVENT_$_"} = $ENV{"AE_$_"}
1257 for grep s/^AE_// && !exists $ENV{"PERL_ANYEVENT_$_"}, keys %ENV;
1229 1258
1230} 1259 @ENV{grep /^PERL_ANYEVENT_/, keys %ENV} = ()
1260 if ${^TAINT};
1231 1261
1232our $MAX_SIGNAL_LATENCY = 10; 1262 # $ENV{PERL_ANYEVENT_xxx} now valid
1233 1263
1234our %PROTOCOL; # (ipv4|ipv6) => (1|2), higher numbers are preferred 1264 $VERBOSE = length $ENV{PERL_ANYEVENT_VERBOSE} ? $ENV{PERL_ANYEVENT_VERBOSE}*1 : 3;
1235 1265
1236{
1237 my $idx; 1266 my $idx;
1238 $PROTOCOL{$_} = ++$idx 1267 $PROTOCOL{$_} = ++$idx
1239 for reverse split /\s*,\s*/, 1268 for reverse split /\s*,\s*/,
1240 $ENV{PERL_ANYEVENT_PROTOCOLS} || "ipv4,ipv6"; 1269 $ENV{PERL_ANYEVENT_PROTOCOLS} || "ipv4,ipv6";
1241} 1270}
… …
1270 push @POSTPONE, shift; 1299 push @POSTPONE, shift;
1271 1300
1272 $POSTPONE_W ||= AE::timer (0, 0, \&_postpone_exec); 1301 $POSTPONE_W ||= AE::timer (0, 0, \&_postpone_exec);
1273 1302
1274 () 1303 ()
1304}
1305
1306sub log($$;@) {
1307 # only load the big bloated module when we actually are about to log something
1308 if ($_[0] <= $VERBOSE) { # also catches non-numeric levels(!)
1309 require AnyEvent::Log;
1310 # AnyEvent::Log overwrites this function
1311 goto &log;
1312 }
1313
1314 0 # not logged
1315}
1316
1317if (length $ENV{PERL_ANYEVENT_LOG}) {
1318 require AnyEvent::Log; # AnyEvent::Log does the thing for us
1275} 1319}
1276 1320
1277our @models = ( 1321our @models = (
1278 [EV:: => AnyEvent::Impl::EV:: , 1], 1322 [EV:: => AnyEvent::Impl::EV:: , 1],
1279 [AnyEvent::Loop:: => AnyEvent::Impl::Perl:: , 1], 1323 [AnyEvent::Loop:: => AnyEvent::Impl::Perl:: , 1],
… …
1289 [POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza 1333 [POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza
1290 [Wx:: => AnyEvent::Impl::POE::], 1334 [Wx:: => AnyEvent::Impl::POE::],
1291 [Prima:: => AnyEvent::Impl::POE::], 1335 [Prima:: => AnyEvent::Impl::POE::],
1292 [IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # a bitch to autodetect 1336 [IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # a bitch to autodetect
1293 [Cocoa::EventLoop:: => AnyEvent::Impl::Cocoa::], 1337 [Cocoa::EventLoop:: => AnyEvent::Impl::Cocoa::],
1294 [FLTK:: => AnyEvent::Impl::FLTK2::], 1338 [FLTK:: => AnyEvent::Impl::FLTK::],
1295); 1339);
1296 1340
1297our @isa_hook; 1341our @isa_hook;
1298 1342
1299sub _isa_set { 1343sub _isa_set {
… …
1318# all autoloaded methods reserve the complete glob, not just the method slot. 1362# all autoloaded methods reserve the complete glob, not just the method slot.
1319# due to bugs in perls method cache implementation. 1363# due to bugs in perls method cache implementation.
1320our @methods = qw(io timer time now now_update signal child idle condvar); 1364our @methods = qw(io timer time now now_update signal child idle condvar);
1321 1365
1322sub detect() { 1366sub detect() {
1367 return $MODEL if $MODEL; # some programs keep references to detect
1368
1323 local $!; # for good measure 1369 local $!; # for good measure
1324 local $SIG{__DIE__}; # we use eval 1370 local $SIG{__DIE__}; # we use eval
1325 1371
1326 # free some memory 1372 # free some memory
1327 *detect = sub () { $MODEL }; 1373 *detect = sub () { $MODEL };
… …
1335 1381
1336 if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z0-9:]+)$/) { 1382 if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z0-9:]+)$/) {
1337 my $model = $1; 1383 my $model = $1;
1338 $model = "AnyEvent::Impl::$model" unless $model =~ s/::$//; 1384 $model = "AnyEvent::Impl::$model" unless $model =~ s/::$//;
1339 if (eval "require $model") { 1385 if (eval "require $model") {
1386 AnyEvent::log 7 => "loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it.";
1340 $MODEL = $model; 1387 $MODEL = $model;
1341 warn "AnyEvent: loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it.\n" if $VERBOSE >= 2;
1342 } else { 1388 } else {
1343 warn "AnyEvent: unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@" if $VERBOSE; 1389 AnyEvent::log 5 => "unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@";
1344 } 1390 }
1345 } 1391 }
1346 1392
1347 # check for already loaded models 1393 # check for already loaded models
1348 unless ($MODEL) { 1394 unless ($MODEL) {
1349 for (@REGISTRY, @models) { 1395 for (@REGISTRY, @models) {
1350 my ($package, $model) = @$_; 1396 my ($package, $model) = @$_;
1351 if (${"$package\::VERSION"} > 0) { 1397 if (${"$package\::VERSION"} > 0) {
1352 if (eval "require $model") { 1398 if (eval "require $model") {
1399 AnyEvent::log 7 => "autodetected model '$model', using it.";
1353 $MODEL = $model; 1400 $MODEL = $model;
1354 warn "AnyEvent: autodetected model '$model', using it.\n" if $VERBOSE >= 2;
1355 last; 1401 last;
1356 } 1402 }
1357 } 1403 }
1358 } 1404 }
1359 1405
… …
1365 $autoload 1411 $autoload
1366 and eval "require $package" 1412 and eval "require $package"
1367 and ${"$package\::VERSION"} > 0 1413 and ${"$package\::VERSION"} > 0
1368 and eval "require $model" 1414 and eval "require $model"
1369 ) { 1415 ) {
1416 AnyEvent::log 7 => "autoloaded model '$model', using it.";
1370 $MODEL = $model; 1417 $MODEL = $model;
1371 warn "AnyEvent: autoloaded model '$model', using it.\n" if $VERBOSE >= 2;
1372 last; 1418 last;
1373 } 1419 }
1374 } 1420 }
1375 1421
1376 $MODEL 1422 $MODEL
1377 or die "AnyEvent: backend autodetection failed - did you properly install AnyEvent?\n"; 1423 or die "AnyEvent: backend autodetection failed - did you properly install AnyEvent?";
1378 } 1424 }
1379 } 1425 }
1380 1426
1381 # free memory only needed for probing 1427 # free memory only needed for probing
1382 undef @models; 1428 undef @models;
… …
1391 if defined &{"$MODEL\::$_"}; 1437 if defined &{"$MODEL\::$_"};
1392 } 1438 }
1393 1439
1394 _isa_set; 1440 _isa_set;
1395 1441
1442 # we're officially open!
1443
1396 if ($ENV{PERL_ANYEVENT_STRICT}) { 1444 if ($ENV{PERL_ANYEVENT_STRICT}) {
1397 require AnyEvent::Strict; 1445 require AnyEvent::Strict;
1398 } 1446 }
1399 1447
1400 if ($ENV{PERL_ANYEVENT_DEBUG_WRAP}) { 1448 if ($ENV{PERL_ANYEVENT_DEBUG_WRAP}) {
1401 require AnyEvent::Debug; 1449 require AnyEvent::Debug;
1402 AnyEvent::Debug::wrap ($ENV{PERL_ANYEVENT_DEBUG_WRAP}); 1450 AnyEvent::Debug::wrap ($ENV{PERL_ANYEVENT_DEBUG_WRAP});
1403 } 1451 }
1404 1452
1405 if (exists $ENV{PERL_ANYEVENT_DEBUG_SHELL}) { 1453 if (length $ENV{PERL_ANYEVENT_DEBUG_SHELL}) {
1406 require AnyEvent::Socket; 1454 require AnyEvent::Socket;
1407 require AnyEvent::Debug; 1455 require AnyEvent::Debug;
1408 1456
1409 my $shell = $ENV{PERL_ANYEVENT_DEBUG_SHELL}; 1457 my $shell = $ENV{PERL_ANYEVENT_DEBUG_SHELL};
1410 $shell =~ s/\$\$/$$/g; 1458 $shell =~ s/\$\$/$$/g;
1411 1459
1412 my ($host, $service) = AnyEvent::Socket::parse_hostport ($shell); 1460 my ($host, $service) = AnyEvent::Socket::parse_hostport ($shell);
1413 $AnyEvent::Debug::SHELL = AnyEvent::Debug::shell ($host, $service); 1461 $AnyEvent::Debug::SHELL = AnyEvent::Debug::shell ($host, $service);
1414 } 1462 }
1463
1464 # now the anyevent environment is set up as the user told us to, so
1465 # call the actual user code - post detects
1415 1466
1416 (shift @post_detect)->() while @post_detect; 1467 (shift @post_detect)->() while @post_detect;
1417 undef @post_detect; 1468 undef @post_detect;
1418 1469
1419 *post_detect = sub(&) { 1470 *post_detect = sub(&) {
… …
1506 sub time() { 1557 sub time() {
1507 AnyEvent->time 1558 AnyEvent->time
1508 } 1559 }
1509 1560
1510 *postpone = \&AnyEvent::postpone; 1561 *postpone = \&AnyEvent::postpone;
1562 *log = \&AnyEvent::log;
1511 }; 1563 };
1512 die if $@; 1564 die if $@;
1513} 1565}
1514 1566
1515BEGIN { _reset } 1567BEGIN { _reset }
… …
1520 1572
1521sub time { 1573sub time {
1522 eval q{ # poor man's autoloading {} 1574 eval q{ # poor man's autoloading {}
1523 # probe for availability of Time::HiRes 1575 # probe for availability of Time::HiRes
1524 if (eval "use Time::HiRes (); Time::HiRes::time (); 1") { 1576 if (eval "use Time::HiRes (); Time::HiRes::time (); 1") {
1525 warn "AnyEvent: using Time::HiRes for sub-second timing accuracy.\n" if $VERBOSE >= 8;
1526 *time = sub { Time::HiRes::time () }; 1577 *time = sub { Time::HiRes::time () };
1527 *AE::time = \& Time::HiRes::time ; 1578 *AE::time = \& Time::HiRes::time ;
1579 *now = \&time;
1580 AnyEvent::log 8 => "AnyEvent: using Time::HiRes for sub-second timing accuracy.";
1528 # if (eval "use POSIX (); (POSIX::times())... 1581 # if (eval "use POSIX (); (POSIX::times())...
1529 } else { 1582 } else {
1530 warn "AnyEvent: using built-in time(), WARNING, no sub-second resolution!\n" if $VERBOSE;
1531 *time = sub { CORE::time }; 1583 *time = sub { CORE::time };
1532 *AE::time = sub (){ CORE::time }; 1584 *AE::time = sub (){ CORE::time };
1585 *now = \&time;
1586 AnyEvent::log 3 => "using built-in time(), WARNING, no sub-second resolution!";
1533 } 1587 }
1534
1535 *now = \&time;
1536 }; 1588 };
1537 die if $@; 1589 die if $@;
1538 1590
1539 &time 1591 &time
1540} 1592}
… …
1633 1685
1634sub signal { 1686sub signal {
1635 eval q{ # poor man's autoloading {} 1687 eval q{ # poor man's autoloading {}
1636 # probe for availability of Async::Interrupt 1688 # probe for availability of Async::Interrupt
1637 if (_have_async_interrupt) { 1689 if (_have_async_interrupt) {
1638 warn "AnyEvent: using Async::Interrupt for race-free signal handling.\n" if $VERBOSE >= 8; 1690 AnyEvent::log 8 => "using Async::Interrupt for race-free signal handling.";
1639 1691
1640 $SIGPIPE_R = new Async::Interrupt::EventPipe; 1692 $SIGPIPE_R = new Async::Interrupt::EventPipe;
1641 $SIG_IO = AE::io $SIGPIPE_R->fileno, 0, \&_signal_exec; 1693 $SIG_IO = AE::io $SIGPIPE_R->fileno, 0, \&_signal_exec;
1642 1694
1643 } else { 1695 } else {
1644 warn "AnyEvent: using emulated perl signal handling with latency timer.\n" if $VERBOSE >= 8; 1696 AnyEvent::log 8 => "using emulated perl signal handling with latency timer.";
1645 1697
1646 if (AnyEvent::WIN32) { 1698 if (AnyEvent::WIN32) {
1647 require AnyEvent::Util; 1699 require AnyEvent::Util;
1648 1700
1649 ($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe (); 1701 ($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe ();
… …
1943$Event/EV::DIED->() >>, L<Glib> uses C<< install_exception_handler >> and 1995$Event/EV::DIED->() >>, L<Glib> uses C<< install_exception_handler >> and
1944so on. 1996so on.
1945 1997
1946=head1 ENVIRONMENT VARIABLES 1998=head1 ENVIRONMENT VARIABLES
1947 1999
1948The following environment variables are used by this module or its 2000AnyEvent supports a number of environment variables that tune the
1949submodules. 2001runtime behaviour. They are usually evaluated when AnyEvent is
2002loaded, initialised, or a submodule that uses them is loaded. Many of
2003them also cause AnyEvent to load additional modules - for example,
2004C<PERL_ANYEVENT_DEBUG_WRAP> causes the L<AnyEvent::Debug> module to be
2005loaded.
1950 2006
1951Note that AnyEvent will remove I<all> environment variables starting with 2007All the environment variables documented here start with
1952C<PERL_ANYEVENT_> from C<%ENV> when it is loaded while taint mode is 2008C<PERL_ANYEVENT_>, which is what AnyEvent considers its own
1953enabled. 2009namespace. Other modules are encouraged (but by no means required) to use
2010C<PERL_ANYEVENT_SUBMODULE> if they have registered the AnyEvent::Submodule
2011namespace on CPAN, for any submodule. For example, L<AnyEvent::HTTP> could
2012be expected to use C<PERL_ANYEVENT_HTTP_PROXY> (it should not access env
2013variables starting with C<AE_>, see below).
2014
2015All variables can also be set via the C<AE_> prefix, that is, instead
2016of setting C<PERL_ANYEVENT_VERBOSE> you can also set C<AE_VERBOSE>. In
2017case there is a clash btween anyevent and another program that uses
2018C<AE_something> you can set the corresponding C<PERL_ANYEVENT_something>
2019variable to the empty string, as those variables take precedence.
2020
2021When AnyEvent is first loaded, it copies all C<AE_xxx> env variables
2022to their C<PERL_ANYEVENT_xxx> counterpart unless that variable already
2023exists. If taint mode is on, then AnyEvent will remove I<all> environment
2024variables starting with C<PERL_ANYEVENT_> from C<%ENV> (or replace them
2025with C<undef> or the empty string, if the corresaponding C<AE_> variable
2026is set).
2027
2028The exact algorithm is currently:
2029
2030 1. if taint mode enabled, delete all PERL_ANYEVENT_xyz variables from %ENV
2031 2. copy over AE_xyz to PERL_ANYEVENT_xyz unless the latter alraedy exists
2032 3. if taint mode enabled, set all PERL_ANYEVENT_xyz variables to undef.
2033
2034This ensures that child processes will not see the C<AE_> variables.
2035
2036The following environment variables are currently known to AnyEvent:
1954 2037
1955=over 4 2038=over 4
1956 2039
1957=item C<PERL_ANYEVENT_VERBOSE> 2040=item C<PERL_ANYEVENT_VERBOSE>
1958 2041
1959By default, AnyEvent will be completely silent except in fatal 2042By default, AnyEvent will only log messages with loglevel C<3>
1960conditions. You can set this environment variable to make AnyEvent more 2043(C<critical>) or higher (see L<AnyEvent::Log>). You can set this
2044environment variable to a numerical loglevel to make AnyEvent more (or
1961talkative. 2045less) talkative.
1962 2046
2047If you want to do more than just set the global logging level
2048you should have a look at C<PERL_ANYEVENT_LOG>, which allows much more
2049complex specifications.
2050
2051When set to C<0> (C<off>), then no messages whatsoever will be logged with
2052the default logging settings.
2053
1963When set to C<1> or higher, causes AnyEvent to warn about unexpected 2054When set to C<5> or higher (C<warn>), causes AnyEvent to warn about
1964conditions, such as not being able to load the event model specified by 2055unexpected conditions, such as not being able to load the event model
1965C<PERL_ANYEVENT_MODEL>. 2056specified by C<PERL_ANYEVENT_MODEL>, or a guard callback throwing an
2057exception - this is the minimum recommended level.
1966 2058
1967When set to C<2> or higher, cause AnyEvent to report to STDERR which event 2059When set to C<7> or higher (info), cause AnyEvent to report which event model it
1968model it chooses. 2060chooses.
1969 2061
1970When set to C<8> or higher, then AnyEvent will report extra information on 2062When set to C<8> or higher (debug), then AnyEvent will report extra information on
1971which optional modules it loads and how it implements certain features. 2063which optional modules it loads and how it implements certain features.
2064
2065=item C<PERL_ANYEVENT_LOG>
2066
2067Accepts rather complex logging specifications. For example, you could log
2068all C<debug> messages of some module to stderr, warnings and above to
2069stderr, and errors and above to syslog, with:
2070
2071 PERL_ANYEVENT_LOG=Some::Module=debug,+log:filter=warn,+%syslog:%syslog=error,syslog
2072
2073For the rather extensive details, see L<AnyEvent::Log>.
2074
2075This variable is evaluated when AnyEvent (or L<AnyEvent::Log>) is loaded,
2076so will take effect even before AnyEvent has initialised itself.
2077
2078Note that specifying this environment variable causes the L<AnyEvent::Log>
2079module to be loaded, while C<PERL_ANYEVENT_VERBOSE> does not, so only
2080using the latter saves a few hundred kB of memory until the first message
2081is being logged.
1972 2082
1973=item C<PERL_ANYEVENT_STRICT> 2083=item C<PERL_ANYEVENT_STRICT>
1974 2084
1975AnyEvent does not do much argument checking by default, as thorough 2085AnyEvent does not do much argument checking by default, as thorough
1976argument checking is very costly. Setting this variable to a true value 2086argument checking is very costly. Setting this variable to a true value
… …
1985C<PERL_ANYEVENT_STRICT=1> in your environment while developing programs 2095C<PERL_ANYEVENT_STRICT=1> in your environment while developing programs
1986can be very useful, however. 2096can be very useful, however.
1987 2097
1988=item C<PERL_ANYEVENT_DEBUG_SHELL> 2098=item C<PERL_ANYEVENT_DEBUG_SHELL>
1989 2099
1990If this env variable is set, then its contents will be interpreted by 2100If this env variable is nonempty, then its contents will be interpreted by
1991C<AnyEvent::Socket::parse_hostport> (after replacing every occurance of 2101C<AnyEvent::Socket::parse_hostport> and C<AnyEvent::Debug::shell> (after
1992C<$$> by the process pid) and an C<AnyEvent::Debug::shell> is bound on 2102replacing every occurance of C<$$> by the process pid). The shell object
1993that port. The shell object is saved in C<$AnyEvent::Debug::SHELL>. 2103is saved in C<$AnyEvent::Debug::SHELL>.
1994 2104
1995This takes place when the first watcher is created. 2105This happens when the first watcher is created.
1996 2106
1997For example, to bind a debug shell on a unix domain socket in 2107For example, to bind a debug shell on a unix domain socket in
1998F<< /tmp/debug<pid>.sock >>, you could use this: 2108F<< /tmp/debug<pid>.sock >>, you could use this:
1999 2109
2000 PERL_ANYEVENT_DEBUG_SHELL=unix/:/tmp/debug\$\$.sock perlprog 2110 PERL_ANYEVENT_DEBUG_SHELL=/tmp/debug\$\$.sock perlprog
2111 # connect with e.g.: socat readline /tmp/debug123.sock
2001 2112
2113Or to bind to tcp port 4545 on localhost:
2114
2115 PERL_ANYEVENT_DEBUG_SHELL=127.0.0.1:4545 perlprog
2116 # connect with e.g.: telnet localhost 4545
2117
2002Note that creating sockets in F</tmp> is very unsafe on multiuser 2118Note that creating sockets in F</tmp> or on localhost is very unsafe on
2003systems. 2119multiuser systems.
2004 2120
2005=item C<PERL_ANYEVENT_DEBUG_WRAP> 2121=item C<PERL_ANYEVENT_DEBUG_WRAP>
2006 2122
2007Can be set to C<0>, C<1> or C<2> and enables wrapping of all watchers for 2123Can be set to C<0>, C<1> or C<2> and enables wrapping of all watchers for
2008debugging purposes. See C<AnyEvent::Debug::wrap> for details. 2124debugging purposes. See C<AnyEvent::Debug::wrap> for details.
… …
2046but support both and try to use both. C<PERL_ANYEVENT_PROTOCOLS=ipv4> 2162but support both and try to use both. C<PERL_ANYEVENT_PROTOCOLS=ipv4>
2047- only support IPv4, never try to resolve or contact IPv6 2163- only support IPv4, never try to resolve or contact IPv6
2048addresses. C<PERL_ANYEVENT_PROTOCOLS=ipv6,ipv4> support either IPv4 or 2164addresses. C<PERL_ANYEVENT_PROTOCOLS=ipv6,ipv4> support either IPv4 or
2049IPv6, but prefer IPv6 over IPv4. 2165IPv6, but prefer IPv6 over IPv4.
2050 2166
2167=item C<PERL_ANYEVENT_HOSTS>
2168
2169This variable, if specified, overrides the F</etc/hosts> file used by
2170L<AnyEvent::Socket>C<::resolve_sockaddr>, i.e. hosts aliases will be read
2171from that file instead.
2172
2051=item C<PERL_ANYEVENT_EDNS0> 2173=item C<PERL_ANYEVENT_EDNS0>
2052 2174
2053Used by L<AnyEvent::DNS> to decide whether to use the EDNS0 extension 2175Used by L<AnyEvent::DNS> to decide whether to use the EDNS0 extension for
2054for DNS. This extension is generally useful to reduce DNS traffic, but 2176DNS. This extension is generally useful to reduce DNS traffic, especially
2055some (broken) firewalls drop such DNS packets, which is why it is off by 2177when DNSSEC is involved, but some (broken) firewalls drop such DNS
2056default. 2178packets, which is why it is off by default.
2057 2179
2058Setting this variable to C<1> will cause L<AnyEvent::DNS> to announce 2180Setting this variable to C<1> will cause L<AnyEvent::DNS> to announce
2059EDNS0 in its DNS requests. 2181EDNS0 in its DNS requests.
2060 2182
2061=item C<PERL_ANYEVENT_MAX_FORKS> 2183=item C<PERL_ANYEVENT_MAX_FORKS>
… …
2069resolver - this is the maximum number of parallel DNS requests that are 2191resolver - this is the maximum number of parallel DNS requests that are
2070sent to the DNS server. 2192sent to the DNS server.
2071 2193
2072=item C<PERL_ANYEVENT_RESOLV_CONF> 2194=item C<PERL_ANYEVENT_RESOLV_CONF>
2073 2195
2074The file to use instead of F</etc/resolv.conf> (or OS-specific 2196The absolute path to a F<resolv.conf>-style file to use instead of
2075configuration) in the default resolver. When set to the empty string, no 2197F</etc/resolv.conf> (or the OS-specific configuration) in the default
2076default config will be used. 2198resolver, or the empty string to select the default configuration.
2077 2199
2078=item C<PERL_ANYEVENT_CA_FILE>, C<PERL_ANYEVENT_CA_PATH>. 2200=item C<PERL_ANYEVENT_CA_FILE>, C<PERL_ANYEVENT_CA_PATH>.
2079 2201
2080When neither C<ca_file> nor C<ca_path> was specified during 2202When neither C<ca_file> nor C<ca_path> was specified during
2081L<AnyEvent::TLS> context creation, and either of these environment 2203L<AnyEvent::TLS> context creation, and either of these environment
2082variables exist, they will be used to specify CA certificate locations 2204variables are nonempty, they will be used to specify CA certificate
2083instead of a system-dependent default. 2205locations instead of a system-dependent default.
2084 2206
2085=item C<PERL_ANYEVENT_AVOID_GUARD> and C<PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT> 2207=item C<PERL_ANYEVENT_AVOID_GUARD> and C<PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT>
2086 2208
2087When these are set to C<1>, then the respective modules are not 2209When these are set to C<1>, then the respective modules are not
2088loaded. Mostly good for testing AnyEvent itself. 2210loaded. Mostly good for testing AnyEvent itself.
… …
2805 2927
2806Tutorial/Introduction: L<AnyEvent::Intro>. 2928Tutorial/Introduction: L<AnyEvent::Intro>.
2807 2929
2808FAQ: L<AnyEvent::FAQ>. 2930FAQ: L<AnyEvent::FAQ>.
2809 2931
2810Utility functions: L<AnyEvent::Util>. 2932Utility functions: L<AnyEvent::Util> (misc. grab-bag), L<AnyEvent::Log>
2933(simply logging).
2811 2934
2935Development/Debugging: L<AnyEvent::Strict> (stricter checking),
2936L<AnyEvent::Debug> (interactive shell, watcher tracing).
2937
2812Event modules: L<AnyEvent::Loop>, L<EV>, L<EV::Glib>, L<Glib::EV>, 2938Supported event modules: L<AnyEvent::Loop>, L<EV>, L<EV::Glib>,
2813L<Event>, L<Glib::Event>, L<Glib>, L<Tk>, L<Event::Lib>, L<Qt>, L<POE>. 2939L<Glib::EV>, L<Event>, L<Glib::Event>, L<Glib>, L<Tk>, L<Event::Lib>,
2940L<Qt>, L<POE>, L<FLTK>.
2814 2941
2815Implementations: L<AnyEvent::Impl::EV>, L<AnyEvent::Impl::Event>, 2942Implementations: L<AnyEvent::Impl::EV>, L<AnyEvent::Impl::Event>,
2816L<AnyEvent::Impl::Glib>, L<AnyEvent::Impl::Tk>, L<AnyEvent::Impl::Perl>, 2943L<AnyEvent::Impl::Glib>, L<AnyEvent::Impl::Tk>, L<AnyEvent::Impl::Perl>,
2817L<AnyEvent::Impl::EventLib>, L<AnyEvent::Impl::Qt>, 2944L<AnyEvent::Impl::EventLib>, L<AnyEvent::Impl::Qt>,
2818L<AnyEvent::Impl::POE>, L<AnyEvent::Impl::IOAsync>, L<Anyevent::Impl::Irssi>. 2945L<AnyEvent::Impl::POE>, L<AnyEvent::Impl::IOAsync>, L<Anyevent::Impl::Irssi>,
2946L<AnyEvent::Impl::FLTK>.
2819 2947
2820Non-blocking file handles, sockets, TCP clients and 2948Non-blocking handles, pipes, stream sockets, TCP clients and
2821servers: L<AnyEvent::Handle>, L<AnyEvent::Socket>, L<AnyEvent::TLS>. 2949servers: L<AnyEvent::Handle>, L<AnyEvent::Socket>, L<AnyEvent::TLS>.
2822 2950
2823Asynchronous DNS: L<AnyEvent::DNS>. 2951Asynchronous DNS: L<AnyEvent::DNS>.
2824 2952
2825Thread support: L<Coro>, L<Coro::AnyEvent>, L<Coro::EV>, L<Coro::Event>. 2953Thread support: L<Coro>, L<Coro::AnyEvent>, L<Coro::EV>, L<Coro::Event>.

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