/usr/share/perl5/Mojo/IOLoop/Stream.pm is in libmojolicious-perl 2.98+dfsg-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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use Mojo::Base 'Mojo::EventEmitter';
use Errno qw(EAGAIN ECONNRESET EINTR EPIPE EWOULDBLOCK);
use Scalar::Util 'weaken';
use Time::HiRes 'time';
has reactor => sub {
require Mojo::IOLoop;
Mojo::IOLoop->singleton->reactor;
};
has timeout => 15;
# "And America has so many enemies.
# Iran, Iraq, China, Mordor, the hoochies that laid low Tiger Woods,
# undesirable immigrants - by which I mean everyone that came after me,
# including my children..."
sub DESTROY { shift->close }
sub new { shift->SUPER::new(handle => shift, buffer => '', active => time) }
sub close {
my $self = shift;
# Cleanup
return unless my $reactor = $self->{reactor};
$reactor->remove(delete $self->{timer}) if $self->{timer};
return unless my $handle = delete $self->{handle};
$reactor->remove($handle);
# Close
close $handle;
$self->emit_safe('close');
}
sub handle { shift->{handle} }
sub is_readable {
my $self = shift;
$self->{active} = time;
return $self->{handle} && $self->reactor->is_readable($self->{handle});
}
sub is_writing {
my $self = shift;
return unless exists $self->{handle};
return length($self->{buffer}) || $self->has_subscribers('drain');
}
sub start {
my $self = shift;
# Timeout
my $reactor = $self->reactor;
weaken $self;
$self->{timer} ||= $reactor->recurring(
0.025 => sub {
return unless $self && (my $t = $self->timeout);
$self->emit_safe('timeout')->close if (time - ($self->{active})) >= $t;
}
);
# Start streaming
my $handle = $self->{handle};
return $reactor->io($handle => sub { pop() ? $self->_write : $self->_read })
unless $self->{streaming}++;
# Resume streaming
return unless delete $self->{paused};
$reactor->watch($handle, 1, $self->is_writing);
}
sub stop {
my $self = shift;
return if $self->{paused}++;
$self->reactor->watch($self->{handle}, 0, $self->is_writing);
}
# "No children have ever meddled with the Republican Party and lived to tell
# about it."
sub steal_handle {
my $self = shift;
$self->reactor->remove($self->{handle});
return delete $self->{handle};
}
sub write {
my ($self, $chunk, $cb) = @_;
# Prepare chunk for writing
$self->{buffer} .= $chunk;
# Write with roundtrip
if ($cb) { $self->once(drain => $cb) }
else { return unless length $self->{buffer} }
# Start writing
$self->reactor->watch($self->{handle}, !$self->{paused}, 1)
if $self->{handle};
}
sub _read {
my $self = shift;
# Read
my $read
= $self->{handle}->sysread(my $buffer, $ENV{MOJO_CHUNK_SIZE} || 131072, 0);
# Error
unless (defined $read) {
# Retry
return if $! ~~ [EAGAIN, EINTR, EWOULDBLOCK];
# Closed
return $self->close if $! ~~ [ECONNRESET, EPIPE];
# Read error
return $self->emit_safe(error => $!)->close;
}
# EOF
return $self->close if $read == 0;
# Handle read
$self->emit_safe(read => $buffer);
$self->{active} = time;
}
# "Oh, I'm in no condition to drive. Wait a minute.
# I don't have to listen to myself. I'm drunk."
sub _write {
my $self = shift;
# Write as much as possible
my $handle = $self->{handle};
if (length $self->{buffer}) {
my $written = $handle->syswrite($self->{buffer});
# Error
unless (defined $written) {
# Retry
return if $! ~~ [EAGAIN, EINTR, EWOULDBLOCK];
# Closed
return $self->close if $! ~~ [ECONNRESET, EPIPE];
# Write error
return $self->emit_safe(error => $!)->close;
}
# Remove written chunk from buffer
$self->emit_safe(write => substr($self->{buffer}, 0, $written, ''));
$self->{active} = time;
}
# Handle drain
$self->emit_safe('drain') if !length $self->{buffer};
# Stop writing
return if $self->is_writing;
$self->reactor->watch($handle, !$self->{paused}, 0);
}
1;
=head1 NAME
Mojo::IOLoop::Stream - Non-blocking I/O stream
=head1 SYNOPSIS
use Mojo::IOLoop::Stream;
# Create stream
my $stream = Mojo::IOLoop::Stream->new($handle);
$stream->on(read => sub {
my ($stream, $chunk) = @_;
...
});
$stream->on(close => sub {
my $stream = shift;
...
});
$stream->on(error => sub {
my ($stream, $err) = @_;
...
});
# Start and stop watching for new data
$stream->start;
$stream->stop;
=head1 DESCRIPTION
L<Mojo::IOLoop::Stream> is a container for I/O streams used by
L<Mojo::IOLoop>.
=head1 EVENTS
L<Mojo::IOLoop::Stream> can emit the following events.
=head2 C<close>
$stream->on(close => sub {
my $stream = shift;
...
});
Emitted safely if the stream gets closed.
=head2 C<drain>
$stream->on(drain => sub {
my $stream = shift;
...
});
Emitted safely once all data has been written.
=head2 C<error>
$stream->on(error => sub {
my ($stream, $err) = @_;
...
});
Emitted safely if an error happens on the stream.
=head2 C<read>
$stream->on(read => sub {
my ($stream, $chunk) = @_;
...
});
Emitted safely if new data arrives on the stream.
=head2 C<timeout>
$stream->on(timeout => sub {
my $stream = shift;
...
});
Emitted safely if the stream has been inactive for too long and will get
closed automatically.
=head2 C<write>
$stream->on(write => sub {
my ($stream, $chunk) = @_;
...
});
Emitted safely if new data has been written to the stream.
=head1 ATTRIBUTES
L<Mojo::IOLoop::Stream> implements the following attributes.
=head2 C<reactor>
my $reactor = $stream->reactor;
$stream = $stream->reactor(Mojo::Reactor::Poll->new);
Low level event reactor, defaults to the C<reactor> attribute value of the
global L<Mojo::IOLoop> singleton.
=head2 C<timeout>
my $timeout = $stream->timeout;
$stream = $stream->timeout(45);
Maximum amount of time in seconds stream can be inactive before getting closed
automatically, defaults to C<15>. Setting the value to C<0> will allow this
stream to be inactive indefinitely.
=head1 METHODS
L<Mojo::IOLoop::Stream> inherits all methods from L<Mojo::EventEmitter> and
implements the following new ones.
=head2 C<new>
my $stream = Mojo::IOLoop::Stream->new($handle);
Construct a new L<Mojo::IOLoop::Stream> object.
=head2 C<close>
$stream->close;
Close stream immediately.
=head2 C<handle>
my $handle = $stream->handle;
Get handle for stream.
=head2 C<is_readable>
my $success = $stream->is_readable;
Quick non-blocking check if stream is readable, useful for identifying tainted
sockets.
=head2 C<is_writing>
my $success = $stream->is_writing;
Check if stream is writing.
=head2 C<start>
$stream->start;
Start watching for new data on the stream.
=head2 C<stop>
$stream->stop;
Stop watching for new data on the stream.
=head2 C<steal_handle>
my $handle = $stream->steal_handle;
Steal handle from stream and prevent it from getting closed automatically.
=head2 C<write>
$stream->write('Hello!');
$stream->write('Hello!', sub {...});
Write data to stream, the optional drain callback will be invoked once all
data has been written.
=head1 SEE ALSO
L<Mojolicious>, L<Mojolicious::Guides>, L<http://mojolicio.us>.
=cut
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