package MogileFS::Connection::Worker;
# This class maintains a connection to one of the various classes of
# workers.

use strict;
use Danga::Socket ();
use base qw{Danga::Socket};

use fields (
            'read_buf',
            'read_size',   # bigger for monitor
            'job',
            'pid',
            'reqid',
            'last_alive',  # unixtime
            'known_state', # hashref of { "$what-$whatid" => $state }
            'wants_todo',  # count of how many jobs worker wants.
            );

sub new {
    my MogileFS::Connection::Worker $self = shift;
    $self = fields::new($self) unless ref $self;
    $self->SUPER::new( @_ );

    $self->{pid}         = 0;
    $self->{reqid}       = 0;
    $self->{wants_todo}  = {};
    $self->{job}         = undef;
    $self->{last_alive}  = time();
    $self->{known_state} = {};
    $self->{read_size}   = 1024;

    return $self;
}

sub note_alive {
    my $self = shift;
    $self->{last_alive} = time();
}

sub watchdog_check {
    my MogileFS::Connection::Worker $self = shift;

    my $timeout               = $self->worker_class->watchdog_timeout;
    my $time_since_last_alive = time() - $self->{last_alive};
    return $time_since_last_alive < $timeout;
}

sub event_read {
    my MogileFS::Connection::Worker $self = shift;

    # if we read data from it, it's not blocked on something else.
    $self->note_alive;

    my $bref = $self->read($self->{read_size});
    return $self->close() unless defined $bref;
    $self->{read_buf} .= $$bref;

    while ($self->{read_buf} =~ s/^(.+?)\r?\n//) {
        my $line = $1;
        if ($self->job eq 'queryworker' && $line !~ /^(?:\:|error|debug)/) {
            MogileFS::ProcManager->HandleQueryWorkerResponse($self, $line);
        } else {
            MogileFS::ProcManager->HandleChildRequest($self, $line);
        }
    }
}

sub event_write {
    my $self = shift;
    my $done = $self->write(undef);
    $self->watch_write(0) if $done;
}

sub job {
    my MogileFS::Connection::Worker $self = shift;
    return $self->{job} unless @_;
    my $j = shift;

    # monitor may send huge state events (which we send to everyone else)
    $self->{read_size} = Mgd::UNIX_RCVBUF_SIZE() if ($j eq 'monitor');
    $self->{job} = $j;
}

sub wants_todo {
    my MogileFS::Connection::Worker $self = shift;
    my $type = shift;
    return $self->{wants_todo}->{$type}-- unless @_;
    return $self->{wants_todo}->{$type} = shift;
}

sub worker_class {
    my MogileFS::Connection::Worker $self = shift;
    return MogileFS::ProcManager->job_to_class($self->{job});
}

sub pid {
    my MogileFS::Connection::Worker $self = shift;
    return $self->{pid} unless @_;
    return $self->{pid} = shift;
}

sub event_hup { my $self = shift; $self->close; }
sub event_err { my $self = shift; $self->close; }

sub close {
    # mark us as being dead
    my MogileFS::Connection::Worker $self = shift;
    MogileFS::ProcManager->NoteDeadWorkerConn($self);
    $self->SUPER::close(@_);
}

1;

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# mode: perl
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