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