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Streamable.pm
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Streamable.pm
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package Streamable;
use MooseX::Role::Parameterized;
use EmitHelper qw(default_emit);
use Scalar::Util qw(weaken);
parameter handle => (
isa => 'Str',
default => 'handle',
);
parameter cb_data => (
isa => 'Str',
default => sub {
my $self = shift;
"on_" . $self->handle() . "_data";
},
lazy => 1,
);
parameter cb_error => (
isa => 'Str',
default => sub {
my $self = shift;
"on_" . $self->handle() . "_error";
},
lazy => 1,
);
role {
my $p = shift;
my $h = $p->handle();
my $cb_data = $p->cb_data();
my $cb_error = $p->cb_error();
with Readable => {
handle => $h,
active => 1,
};
with Writable => {
handle => $h,
};
has out_buffer => (
is => 'rw',
isa => 'ScalarRef',
default => sub { my $x = ""; \$x },
);
method "on_${h}_readable" => sub {
my ($self, $arg) = @_;
my $octet_count = sysread($arg->{handle}, my $buffer = "", 65536);
if ($octet_count) {
$self->$cb_data({ data => $buffer });
return;
}
return if defined $octet_count;
$self->cb_error(
{
errnum => ($! + 0),
errstr => "$!",
errfun => "sysread",
}
);
};
method "put_$h" => sub {
my ($self, @chunks) = @_;
# TODO - Benchmark string vs. array.
my $out_buffer = $self->out_buffer();
if (length $$out_buffer) {
$$out_buffer .= $_ foreach @chunks;
return length $$out_buffer;
}
# Try to flush 'em all.
while (@chunks) {
my $next = shift @chunks;
my $octet_count = syswrite($self->$h(), $next);
# Hard error.
unless (defined $octet_count) {
$self->$cb_error(
{
errnum => ($! + 0),
errstr => "$!",
errfun => "syswrite",
}
);
return;
}
use bytes;
# Wrote it all! Whooooo!
next if $octet_count == length $next;
# Wrote less than all. Save the rest, and turn on write
# multiplexing.
$$out_buffer = substr($next, $octet_count);
$$out_buffer .= $_ foreach @chunks;
$self->resume_handle_writable();
return length $$out_buffer;
}
# Flushed it all. Yay!
return 0;
};
# Default callbacks that re-emit their parameters.
method default_emit($cb_data, "data");
method default_emit($cb_error, "error");
};
1;