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pbot/PBot/SelectHandler.pm
2021-06-06 19:12:14 -07:00

97 lines
2.5 KiB
Perl

# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
package PBot::SelectHandler;
use parent 'PBot::Class';
use warnings; use strict;
use feature 'unicode_strings';
use utf8;
use IO::Select;
sub initialize {
my ($self, %conf) = @_;
$self->{select} = IO::Select->new();
$self->{readers} = {};
$self->{buffers} = {};
}
sub add_reader {
my ($self, $handle, $subref) = @_;
$self->{select}->add($handle);
$self->{readers}->{$handle} = $subref;
$self->{buffers}->{$handle} = '';
}
sub remove_reader {
my ($self, $handle) = @_;
$self->{select}->remove($handle);
delete $self->{readers}->{$handle};
delete $self->{buffers}->{$handle};
}
sub do_select {
my ($self) = @_;
# maximum read length
my $length = 8192;
# check if any readers can read
my @ready = $self->{select}->can_read(.1);
foreach my $fh (@ready) {
# read from handle
my $ret = sysread($fh, my $buf, $length);
# error reading
if (not defined $ret) {
$self->{pbot}->{logger}->log("SelectHandler: Error reading $fh: $!\n");
$self->remove_reader($fh);
next;
}
# reader closed
if ($ret == 0) {
# is there anything in reader's buffer?
if (length $self->{buffers}->{$fh}) {
# send buffer to reader subref
$self->{readers}->{$fh}->($self->{buffers}->{$fh});
}
# remove reader
$self->remove_reader($fh);
# skip to next reader
next;
}
# sanity check for missing reader
if (not exists $self->{readers}->{$fh}) {
$self->{pbot}->{logger}->log("Error: no reader for $fh\n");
# skip to next reader
next;
}
# accumulate input into reader's buffer
$self->{buffers}->{$fh} .= $buf;
# if we read less than max length bytes then this is probably
# a complete message so send it to reader now, otherwise we'll
# continue to accumulate input into reader's buffer and then send
# the buffer when reader closes.
if ($ret < $length) {
# send reader's buffer to reader subref
$self->{readers}->{$fh}->($self->{buffers}->{$fh});
# clear out reader's buffer
$self->{buffers}->{$fh} = '';
}
}
}
1;