/usr/share/perl5/Mojo/IOLoop/Stream.pm is in libmojolicious-perl 7.59+dfsg-1ubuntu1.
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 EWOULDBLOCK);
use Mojo::IOLoop;
use Mojo::Util;
use Scalar::Util 'weaken';
has reactor => sub { Mojo::IOLoop->singleton->reactor };
sub DESTROY { Mojo::Util::_global_destruction() or shift->close }
sub close {
my $self = shift;
return unless my $reactor = $self->reactor;
return unless my $handle = delete $self->timeout(0)->{handle};
$reactor->remove($handle);
$self->emit('close');
}
sub close_gracefully { $_[0]->is_writing ? $_[0]{graceful}++ : $_[0]->close }
sub handle { shift->{handle} }
sub is_readable {
my $self = shift;
$self->_again;
return $self->{handle} && Mojo::Util::_readable(0, fileno $self->{handle});
}
sub is_writing {
my $self = shift;
return undef unless $self->{handle};
return !!length($self->{buffer}) || $self->has_subscribers('drain');
}
sub new { shift->SUPER::new(handle => shift, buffer => '', timeout => 15) }
sub start {
my $self = shift;
# Resume
my $reactor = $self->reactor;
return $reactor->watch($self->{handle}, 1, $self->is_writing)
if delete $self->{paused};
weaken $self;
my $cb = sub { pop() ? $self->_write : $self->_read };
$reactor->io($self->timeout($self->{timeout})->{handle} => $cb);
}
sub steal_handle {
my $self = shift;
$self->reactor->remove($self->{handle});
return delete $self->{handle};
}
sub stop {
my $self = shift;
$self->reactor->watch($self->{handle}, 0, $self->is_writing)
unless $self->{paused}++;
}
sub timeout {
my $self = shift;
return $self->{timeout} unless @_;
my $reactor = $self->reactor;
$reactor->remove(delete $self->{timer}) if $self->{timer};
return $self unless my $timeout = $self->{timeout} = shift;
weaken $self;
$self->{timer}
= $reactor->timer($timeout => sub { $self->emit('timeout')->close });
return $self;
}
sub write {
my ($self, $chunk, $cb) = @_;
# IO::Socket::SSL will corrupt data with the wrong internal representation
utf8::downgrade $chunk;
$self->{buffer} .= $chunk;
if ($cb) { $self->once(drain => $cb) }
elsif (!length $self->{buffer}) { return $self }
$self->reactor->watch($self->{handle}, !$self->{paused}, 1)
if $self->{handle};
return $self;
}
sub _again { $_[0]->reactor->again($_[0]{timer}) if $_[0]{timer} }
sub _read {
my $self = shift;
my $read = $self->{handle}->sysread(my $buffer, 131072, 0);
return $read == 0 ? $self->close : $self->emit(read => $buffer)->_again
if defined $read;
# Retry
return if $! == EAGAIN || $! == EINTR || $! == EWOULDBLOCK;
# Closed (maybe real error)
$! == ECONNRESET ? $self->close : $self->emit(error => $!)->close;
}
sub _write {
my $self = shift;
# Handle errors only when reading (to avoid timing problems)
my $handle = $self->{handle};
if (length $self->{buffer}) {
return unless defined(my $written = $handle->syswrite($self->{buffer}));
$self->emit(write => substr($self->{buffer}, 0, $written, ''))->_again;
}
$self->emit('drain') unless length $self->{buffer};
return if $self->is_writing;
return $self->close if $self->{graceful};
$self->reactor->watch($handle, !$self->{paused}, 0) if $self->{handle};
}
1;
=encoding utf8
=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, $bytes) = @_;
...
});
$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;
# Start reactor if necessary
$stream->reactor->start unless $stream->reactor->is_running;
=head1 DESCRIPTION
L<Mojo::IOLoop::Stream> is a container for I/O streams used by L<Mojo::IOLoop>.
=head1 EVENTS
L<Mojo::IOLoop::Stream> inherits all events from L<Mojo::EventEmitter> and can
emit the following new ones.
=head2 close
$stream->on(close => sub {
my $stream = shift;
...
});
Emitted if the stream gets closed.
=head2 drain
$stream->on(drain => sub {
my $stream = shift;
...
});
Emitted once all data has been written.
=head2 error
$stream->on(error => sub {
my ($stream, $err) = @_;
...
});
Emitted if an error occurs on the stream, fatal if unhandled.
=head2 read
$stream->on(read => sub {
my ($stream, $bytes) = @_;
...
});
Emitted if new data arrives on the stream.
=head2 timeout
$stream->on(timeout => sub {
my $stream = shift;
...
});
Emitted if the stream has been inactive for too long and will get closed
automatically.
=head2 write
$stream->on(write => sub {
my ($stream, $bytes) = @_;
...
});
Emitted if new data has been written to the stream.
=head1 ATTRIBUTES
L<Mojo::IOLoop::Stream> implements the following attributes.
=head2 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.
=head1 METHODS
L<Mojo::IOLoop::Stream> inherits all methods from L<Mojo::EventEmitter> and
implements the following new ones.
=head2 close
$stream->close;
Close stream immediately.
=head2 close_gracefully
$stream->close_gracefully;
Close stream gracefully.
=head2 handle
my $handle = $stream->handle;
Get handle for stream, usually an L<IO::Socket::IP> or L<IO::Socket::SSL>
object.
=head2 is_readable
my $bool = $stream->is_readable;
Quick non-blocking check if stream is readable, useful for identifying tainted
sockets.
=head2 is_writing
my $bool = $stream->is_writing;
Check if stream is writing.
=head2 new
my $stream = Mojo::IOLoop::Stream->new($handle);
Construct a new L<Mojo::IOLoop::Stream> object.
=head2 start
$stream->start;
Start or resume watching for new data on the stream.
=head2 steal_handle
my $handle = $stream->steal_handle;
Steal L</"handle"> and prevent it from getting closed automatically.
=head2 stop
$stream->stop;
Stop watching for new data on the stream.
=head2 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.
=head2 write
$stream = $stream->write($bytes);
$stream = $stream->write($bytes => sub {...});
Write data to stream, the optional drain callback will be executed once all data
has been written.
=head1 SEE ALSO
L<Mojolicious>, L<Mojolicious::Guides>, L<http://mojolicious.org>.
=cut
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