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=head1 NAME |
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Coro::Handle - non-blocking io with a blocking interface. |
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=head1 SYNOPSIS |
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use Coro::Handle; |
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=head1 DESCRIPTION |
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This module implements IO-handles in a coroutine-compatible way, that is, |
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1.14 |
other coroutines can run while reads or writes block on the handle. |
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It does so by using L<AnyEvent|AnyEvent> to wait for readable/writable |
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data, allowing other coroutines to run while one coroutine waits for I/O. |
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Coro::Handle does NOT inherit from IO::Handle but uses tied objects. |
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1.1 |
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If at all possible, you should I<always> prefer method calls on the handle object over invoking |
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tied methods, i.e.: |
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$fh->print ($str); # NOT print $fh $str; |
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my $line = $fh->readline; # NOT my $line = <$fh>; |
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The reason is that perl recurses within the interpreter when invoking tie |
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magic, forcing the (temporary) allocation of a (big) stack. If you have |
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lots of socket connections and they happen to wait in e.g. <$fh>, then |
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they would all have a costly C coroutine associated with them. |
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1.1 |
=over 4 |
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=cut |
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package Coro::Handle; |
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1.16 |
no warnings; |
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use strict; |
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1.13 |
|
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1.16 |
use Carp (); |
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1.1 |
use Errno (); |
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1.5 |
use base 'Exporter'; |
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1.1 |
|
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1.22 |
our $VERSION = '3.0'; |
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1.16 |
our @EXPORT = qw(unblock); |
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1.1 |
|
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1.6 |
=item $fh = new_from_fh Coro::Handle $fhandle [, arg => value...] |
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1.1 |
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Create a new non-blocking io-handle using the given |
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1.19 |
perl-filehandle. Returns C<undef> if no filehandle is given. The only |
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other supported argument is "timeout", which sets a timeout for each |
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operation. |
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1.1 |
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=cut |
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sub new_from_fh { |
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my $class = shift; |
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my $fh = shift or return; |
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my $self = do { local *Coro::Handle }; |
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1.20 |
tie $self, 'Coro::Handle::FH', fh => $fh, @_; |
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1.1 |
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1.22 |
bless \$self, ref $class ? ref $class : $class |
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1.1 |
} |
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1.5 |
=item $fh = unblock $fh |
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1.22 |
This is a convinience function that just calls C<new_from_fh> on the |
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given filehandle. Use it to replace a normal perl filehandle by a |
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non-(coroutine-)blocking equivalent. |
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=cut |
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sub unblock($) { |
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1.19 |
new_from_fh Coro::Handle $_[0] |
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1.5 |
} |
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1.1 |
=item $fh->writable, $fh->readable |
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Wait until the filehandle is readable or writable (and return true) or |
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until an error condition happens (and return false). |
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=cut |
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1.16 |
sub readable { Coro::Handle::FH::readable (tied ${$_[0]}) } |
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sub writable { Coro::Handle::FH::writable (tied ${$_[0]}) } |
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1.1 |
|
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1.16 |
=item $fh->readline ([$terminator]) |
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|
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Like the builtin of the same name, but allows you to specify the input |
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1.7 |
record separator in a coroutine-safe manner (i.e. not using a global |
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1.4 |
variable). |
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=cut |
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1.18 |
sub readline { tied(${+shift})->READLINE (@_) } |
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1.4 |
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1.16 |
=item $fh->autoflush ([...]) |
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1.4 |
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Always returns true, arguments are being ignored (exists for compatibility |
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1.8 |
only). Might change in the future. |
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|
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=cut |
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sub autoflush { !0 } |
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1.13 |
=item $fh->fileno, $fh->close, $fh->read, $fh->sysread, $fh->syswrite, $fh->print, $fh->printf |
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1.8 |
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1.13 |
Work like their function equivalents (except read, which works like |
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1.18 |
sysread. You should not use the read function with Coro::Handle's, it will |
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1.13 |
work but it's not efficient). |
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1.8 |
|
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=cut |
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1.13 |
sub read { Coro::Handle::FH::READ (tied ${$_[0]}, $_[1], $_[2], $_[3]) } |
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sub sysread { Coro::Handle::FH::READ (tied ${$_[0]}, $_[1], $_[2], $_[3]) } |
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sub syswrite { Coro::Handle::FH::WRITE (tied ${$_[0]}, $_[1], $_[2], $_[3]) } |
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sub print { Coro::Handle::FH::WRITE (tied ${+shift}, join "", @_) } |
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sub printf { Coro::Handle::FH::PRINTF (tied ${+shift}, @_) } |
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sub fileno { Coro::Handle::FH::FILENO (tied ${$_[0]}) } |
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sub close { Coro::Handle::FH::CLOSE (tied ${$_[0]}) } |
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sub blocking { !0 } # this handler always blocks the caller |
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sub partial { |
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my $obj = tied ${$_[0]}; |
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my $retval = $obj->[8]; |
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$obj->[8] = $_[1] if @_ > 1; |
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$retval |
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} |
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1.8 |
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1.27 |
=item connect, listen, bind, getsockopt, setsockopt, |
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send, recv, peername, sockname, shutdown, peerport, peerhost |
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Do the same thing as the perl builtins or IO::Socket methods (but return |
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true on EINPROGRESS). Remember that these must be method calls. |
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=cut |
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sub connect { connect tied(${$_[0]})->[0], $_[1] or $! == Errno::EINPROGRESS } |
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sub bind { bind tied(${$_[0]})->[0], $_[1] } |
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sub listen { listen tied(${$_[0]})->[0], $_[1] } |
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sub getsockopt { getsockopt tied(${$_[0]})->[0], $_[1], $_[2] } |
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sub setsockopt { setsockopt tied(${$_[0]})->[0], $_[1], $_[2], $_[3] } |
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sub send { send tied(${$_[0]})->[0], $_[1], $_[2], @_ > 2 ? $_[3] : () } |
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sub recv { recv tied(${$_[0]})->[0], $_[1], $_[2], @_ > 2 ? $_[3] : () } |
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sub sockname { getsockname tied(${$_[0]})->[0] } |
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sub peername { getpeername tied(${$_[0]})->[0] } |
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sub shutdown { shutdown tied(${$_[0]})->[0], $_[1] } |
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=item ($fh, $peername) = $listen_fh->accept |
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In scalar context, returns the newly accepted socket (or undef) and in |
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list context return the ($fh, $peername) pair (or nothing). |
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=cut |
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sub accept { |
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my ($peername, $fh); |
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while () { |
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$peername = accept $fh, tied(${$_[0]})->[0] |
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and return wantarray |
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? ($_[0]->new_from_fh($fh), $peername) |
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: $_[0]->new_from_fh($fh); |
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return unless $!{EAGAIN}; |
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$_[0]->readable or return; |
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} |
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} |
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1.21 |
=item $fh->timeout ([...]) |
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1.8 |
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1.13 |
The optional argument sets the new timeout (in seconds) for this |
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1.8 |
handle. Returns the current (new) value. |
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C<0> is a valid timeout, use C<undef> to disable the timeout. |
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=cut |
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sub timeout { |
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1.18 |
my $self = tied ${$_[0]}; |
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1.13 |
if (@_ > 1) { |
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$self->[2] = $_[1]; |
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1.18 |
$self->[5]->timeout ($_[1]) if $self->[5]; |
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$self->[6]->timeout ($_[1]) if $self->[6]; |
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1.8 |
} |
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1.21 |
$self->[2] |
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1.13 |
} |
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=item $fh->fh |
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Returns the "real" (non-blocking) filehandle. Use this if you want to |
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do operations on the file handle you cannot do using the Coro::Handle |
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interface. |
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=item $fh->rbuf |
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Returns the current contents of the read buffer (this is an lvalue, so you |
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can change the read buffer if you like). |
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You can use this function to implement your own optimized reader when neither |
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readline nor sysread are viable candidates, like this: |
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# first get the _real_ non-blocking filehandle |
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# and fetch a reference to the read buffer |
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my $nb_fh = $fh->fh; |
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my $buf = \$fh->rbuf; |
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1.18 |
while () { |
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1.13 |
# now use buffer contents, modifying |
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# if necessary to reflect the removed data |
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last if $$buf ne ""; # we have leftover data |
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# read another buffer full of data |
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$fh->readable or die "end of file"; |
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sysread $nb_fh, $$buf, 8192; |
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} |
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=cut |
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sub fh { |
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(tied ${$_[0]})->[0]; |
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} |
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sub rbuf : lvalue { |
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(tied ${$_[0]})->[3]; |
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} |
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sub DESTROY { |
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# nop |
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} |
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1.16 |
our $AUTOLOAD; |
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1.13 |
sub AUTOLOAD { |
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my $self = tied ${$_[0]}; |
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(my $func = $AUTOLOAD) =~ s/^(.*):://; |
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my $forward = UNIVERSAL::can $self->[7], $func; |
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$forward or |
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die "Can't locate object method \"$func\" via package \"" . (ref $self) . "\""; |
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goto &$forward; |
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1.8 |
} |
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1.1 |
package Coro::Handle::FH; |
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1.16 |
no warnings; |
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use strict; |
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1.13 |
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1.1 |
use Fcntl (); |
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use Errno (); |
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1.10 |
use Carp 'croak'; |
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1.1 |
|
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1.13 |
use AnyEvent; |
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1.1 |
|
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1.13 |
# formerly a hash, but we are speed-critical, so try |
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# to be faster even if it hurts. |
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# |
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# 0 FH |
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# 1 desc |
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# 2 timeout |
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# 3 rb |
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# 4 wb # unused |
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1.17 |
# 5 read watcher, if Coro::Event used |
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# 6 write watcher, if Coro::Event used |
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1.13 |
# 7 forward class |
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# 8 blocking |
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1.1 |
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sub TIEHANDLE { |
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1.13 |
my ($class, %arg) = @_; |
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1.1 |
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1.13 |
my $self = bless [], $class; |
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$self->[0] = $arg{fh}; |
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$self->[1] = $arg{desc}; |
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$self->[2] = $arg{timeout}; |
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$self->[3] = ""; |
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$self->[4] = ""; |
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$self->[7] = $arg{forward_class}; |
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$self->[8] = $arg{partial}; |
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1.1 |
|
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1.13 |
fcntl $self->[0], &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK |
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1.10 |
or croak "fcntl(O_NONBLOCK): $!"; |
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1.6 |
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1.13 |
$self |
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} |
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sub cleanup { |
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1.29 |
$_[0][5]->cancel if $_[0][5]; |
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$_[0][6]->cancel if $_[0][6]; |
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@{$_[0]} = (); |
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1.1 |
} |
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sub OPEN { |
298 |
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1.13 |
&cleanup; |
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1.1 |
my $self = shift; |
300 |
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1.13 |
my $r = @_ == 2 ? open $self->[0], $_[0], $_[1] |
301 |
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: open $self->[0], $_[0], $_[1], $_[2]; |
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1.18 |
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1.1 |
if ($r) { |
304 |
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1.13 |
fcntl $self->[0], &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK |
305 |
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1.10 |
or croak "fcntl(O_NONBLOCK): $!"; |
306 |
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1.1 |
} |
307 |
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1.18 |
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308 |
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$r |
309 |
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1.1 |
} |
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311 |
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1.13 |
sub PRINT { |
312 |
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1.18 |
WRITE (shift, join "", @_) |
313 |
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1.13 |
} |
314 |
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sub PRINTF { |
316 |
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1.18 |
WRITE (shift, sprintf shift,@_) |
317 |
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1.13 |
} |
318 |
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sub GETC { |
320 |
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my $buf; |
321 |
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1.16 |
READ ($_[0], $buf, 1); |
322 |
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1.18 |
$buf |
323 |
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1.13 |
} |
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sub BINMODE { |
326 |
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binmode $_[0][0]; |
327 |
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} |
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sub TELL { |
330 |
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1.16 |
Carp::croak "Coro::Handle's don't support tell()"; |
331 |
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1.13 |
} |
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sub SEEK { |
334 |
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1.16 |
Carp::croak "Coro::Handle's don't support seek()"; |
335 |
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1.13 |
} |
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sub EOF { |
338 |
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1.16 |
Carp::croak "Coro::Handle's don't support eof()"; |
339 |
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1.13 |
} |
340 |
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341 |
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1.1 |
sub CLOSE { |
342 |
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1.13 |
&cleanup; |
343 |
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1.18 |
close $_[0][0] |
344 |
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1.13 |
} |
345 |
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sub DESTROY { |
347 |
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&cleanup; |
348 |
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1.8 |
} |
349 |
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sub FILENO { |
351 |
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1.18 |
fileno $_[0][0] |
352 |
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1.1 |
} |
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1.13 |
# seems to be called for stringification (how weird), at least |
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# when DumpValue::dumpValue is used to print this. |
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sub FETCH { |
357 |
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1.18 |
"$_[0]<$_[0][1]>" |
358 |
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1.1 |
} |
359 |
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360 |
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1.17 |
sub readable_anyevent { |
361 |
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1.13 |
my $current = $Coro::current; |
362 |
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my $io = 1; |
363 |
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364 |
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my $w = AnyEvent->io ( |
365 |
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1.16 |
desc => "$_[0][1] read watcher", |
366 |
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fh => $_[0][0], |
367 |
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poll => 'r', |
368 |
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cb => sub { |
369 |
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1.30 |
$current->ready if $current; |
370 |
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1.15 |
undef $current; |
371 |
root |
1.13 |
}, |
372 |
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); |
373 |
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374 |
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1.16 |
my $t = (defined $_[0][2]) && AnyEvent->timer ( |
375 |
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desc => "fh $_[0][1] read timeout", |
376 |
root |
1.13 |
after => $_[0][2], |
377 |
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cb => sub { |
378 |
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$io = 0; |
379 |
root |
1.30 |
$current->ready if $current; |
380 |
root |
1.15 |
undef $current; |
381 |
root |
1.13 |
}, |
382 |
|
|
); |
383 |
|
|
|
384 |
|
|
&Coro::schedule; |
385 |
root |
1.15 |
&Coro::schedule while $current; |
386 |
|
|
|
387 |
root |
1.13 |
$io |
388 |
|
|
} |
389 |
|
|
|
390 |
root |
1.17 |
sub writable_anyevent { |
391 |
root |
1.13 |
my $current = $Coro::current; |
392 |
|
|
my $io = 1; |
393 |
|
|
|
394 |
|
|
my $w = AnyEvent->io ( |
395 |
root |
1.16 |
desc => "fh $_[0][1] write watcher", |
396 |
|
|
fh => $_[0][0], |
397 |
|
|
poll => 'w', |
398 |
|
|
cb => sub { |
399 |
root |
1.30 |
$current->ready if $current; |
400 |
root |
1.15 |
undef $current; |
401 |
root |
1.13 |
}, |
402 |
|
|
); |
403 |
|
|
|
404 |
root |
1.16 |
my $t = (defined $_[0][2]) && AnyEvent->timer ( |
405 |
|
|
desc => "fh $_[0][1] write timeout", |
406 |
root |
1.13 |
after => $_[0][2], |
407 |
|
|
cb => sub { |
408 |
|
|
$io = 0; |
409 |
root |
1.30 |
$current->ready if $current; |
410 |
root |
1.15 |
undef $current; |
411 |
root |
1.13 |
}, |
412 |
|
|
); |
413 |
|
|
|
414 |
root |
1.15 |
&Coro::schedule while $current; |
415 |
|
|
|
416 |
root |
1.13 |
$io |
417 |
root |
1.1 |
} |
418 |
|
|
|
419 |
root |
1.17 |
sub readable_coro { |
420 |
root |
1.18 |
($_[0][5] ||= "Coro::Event"->io ( |
421 |
root |
1.17 |
fd => $_[0][0], |
422 |
|
|
desc => "fh $_[0][1] read watcher", |
423 |
|
|
timeout => $_[0][2], |
424 |
|
|
poll => &Event::Watcher::R + &Event::Watcher::E + &Event::Watcher::T, |
425 |
root |
1.26 |
))->next->[4] & &Event::Watcher::R |
426 |
root |
1.17 |
} |
427 |
|
|
|
428 |
|
|
sub writable_coro { |
429 |
root |
1.18 |
($_[0][6] ||= "Coro::Event"->io ( |
430 |
root |
1.17 |
fd => $_[0][0], |
431 |
|
|
desc => "fh $_[0][1] write watcher", |
432 |
|
|
timeout => $_[0][2], |
433 |
|
|
poll => &Event::Watcher::W + &Event::Watcher::E + &Event::Watcher::T, |
434 |
root |
1.26 |
))->next->[4] & &Event::Watcher::W |
435 |
root |
1.17 |
} |
436 |
|
|
|
437 |
root |
1.30 |
sub readable_ev { |
438 |
root |
1.31 |
&EV::READ == Coro::EV::timed_io_once (fileno $_[0][0], &EV::READ , $_[0][2]) |
439 |
root |
1.30 |
} |
440 |
|
|
|
441 |
|
|
sub writable_ev { |
442 |
root |
1.31 |
&EV::WRITE == Coro::EV::timed_io_once (fileno $_[0][0], &EV::WRITE, $_[0][2]) |
443 |
root |
1.30 |
} |
444 |
|
|
|
445 |
root |
1.21 |
# decide on event model at runtime |
446 |
root |
1.17 |
for my $rw (qw(readable writable)) { |
447 |
|
|
no strict 'refs'; |
448 |
|
|
|
449 |
|
|
*$rw = sub { |
450 |
root |
1.25 |
AnyEvent::detect; |
451 |
root |
1.17 |
if ($AnyEvent::MODEL eq "AnyEvent::Impl::Coro" or $AnyEvent::MODEL eq "AnyEvent::Impl::Event") { |
452 |
|
|
require Coro::Event; |
453 |
|
|
*$rw = \&{"$rw\_coro"}; |
454 |
root |
1.30 |
} elsif ($AnyEvent::MODEL eq "EV::AnyEvent") { |
455 |
|
|
require Coro::EV; |
456 |
|
|
*$rw = \&{"$rw\_ev"}; |
457 |
root |
1.17 |
} else { |
458 |
|
|
*$rw = \&{"$rw\_anyevent"}; |
459 |
|
|
} |
460 |
root |
1.25 |
goto &$rw |
461 |
root |
1.17 |
}; |
462 |
|
|
}; |
463 |
|
|
|
464 |
root |
1.1 |
sub WRITE { |
465 |
|
|
my $len = defined $_[2] ? $_[2] : length $_[1]; |
466 |
|
|
my $ofs = $_[3]; |
467 |
|
|
my $res = 0; |
468 |
|
|
|
469 |
root |
1.16 |
while () { |
470 |
|
|
my $r = syswrite ($_[0][0], $_[1], $len, $ofs); |
471 |
root |
1.1 |
if (defined $r) { |
472 |
|
|
$len -= $r; |
473 |
|
|
$ofs += $r; |
474 |
|
|
$res += $r; |
475 |
|
|
last unless $len; |
476 |
|
|
} elsif ($! != Errno::EAGAIN) { |
477 |
|
|
last; |
478 |
|
|
} |
479 |
root |
1.13 |
last unless &writable; |
480 |
root |
1.1 |
} |
481 |
|
|
|
482 |
|
|
return $res; |
483 |
|
|
} |
484 |
|
|
|
485 |
|
|
sub READ { |
486 |
|
|
my $len = $_[2]; |
487 |
|
|
my $ofs = $_[3]; |
488 |
|
|
my $res = 0; |
489 |
|
|
|
490 |
root |
1.7 |
# first deplete the read buffer |
491 |
root |
1.13 |
if (length $_[0][3]) { |
492 |
|
|
my $l = length $_[0][3]; |
493 |
root |
1.7 |
if ($l <= $len) { |
494 |
root |
1.18 |
substr ($_[1], $ofs) = $_[0][3]; $_[0][3] = ""; |
495 |
root |
1.7 |
$len -= $l; |
496 |
root |
1.13 |
$ofs += $l; |
497 |
root |
1.7 |
$res += $l; |
498 |
|
|
return $res unless $len; |
499 |
|
|
} else { |
500 |
root |
1.18 |
substr ($_[1], $ofs) = substr ($_[0][3], 0, $len); |
501 |
|
|
substr ($_[0][3], 0, $len) = ""; |
502 |
root |
1.7 |
return $len; |
503 |
|
|
} |
504 |
|
|
} |
505 |
|
|
|
506 |
root |
1.2 |
while() { |
507 |
root |
1.13 |
my $r = sysread $_[0][0], $_[1], $len, $ofs; |
508 |
root |
1.1 |
if (defined $r) { |
509 |
|
|
$len -= $r; |
510 |
|
|
$ofs += $r; |
511 |
|
|
$res += $r; |
512 |
|
|
last unless $len && $r; |
513 |
|
|
} elsif ($! != Errno::EAGAIN) { |
514 |
|
|
last; |
515 |
|
|
} |
516 |
root |
1.13 |
last if $_[0][8] || !&readable; |
517 |
root |
1.1 |
} |
518 |
|
|
|
519 |
|
|
return $res; |
520 |
|
|
} |
521 |
|
|
|
522 |
|
|
sub READLINE { |
523 |
root |
1.13 |
my $irs = @_ > 1 ? $_[1] : $/; |
524 |
root |
1.1 |
|
525 |
|
|
while() { |
526 |
root |
1.24 |
if (defined $irs) { |
527 |
|
|
my $pos = index $_[0][3], $irs; |
528 |
|
|
if ($pos >= 0) { |
529 |
|
|
$pos += length $irs; |
530 |
|
|
my $res = substr $_[0][3], 0, $pos; |
531 |
|
|
substr ($_[0][3], 0, $pos) = ""; |
532 |
|
|
return $res; |
533 |
|
|
} |
534 |
root |
1.1 |
} |
535 |
root |
1.13 |
|
536 |
|
|
my $r = sysread $_[0][0], $_[0][3], 8192, length $_[0][3]; |
537 |
root |
1.1 |
if (defined $r) { |
538 |
root |
1.24 |
return length $_[0][3] ? delete $_[0][3] : undef unless $r; |
539 |
root |
1.13 |
} elsif ($! != Errno::EAGAIN || !&readable) { |
540 |
root |
1.24 |
return length $_[0][3] ? delete $_[0][3] : undef; |
541 |
root |
1.1 |
} |
542 |
|
|
} |
543 |
root |
1.6 |
} |
544 |
|
|
|
545 |
root |
1.13 |
1; |
546 |
root |
1.1 |
|
547 |
root |
1.13 |
=back |
548 |
root |
1.1 |
|
549 |
|
|
=head1 BUGS |
550 |
|
|
|
551 |
|
|
- Perl's IO-Handle model is THE bug. |
552 |
|
|
|
553 |
|
|
=head1 AUTHOR |
554 |
|
|
|
555 |
root |
1.13 |
Marc Lehmann <schmorp@schmorp.de> |
556 |
|
|
http://home.schmorp.de/ |
557 |
root |
1.1 |
|
558 |
|
|
=cut |
559 |
|
|
|