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294 lines
10 KiB
Perl
294 lines
10 KiB
Perl
# File: ProcessManager.pm
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# Author: pragma_
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#
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# Purpose: Handles forking and execution of module/subroutine processes
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# 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::ProcessManager;
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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 Time::Duration qw/concise duration/;
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use Time::HiRes qw/gettimeofday/;
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use Getopt::Long qw/GetOptionsFromArray/;
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use POSIX qw/WNOHANG/;
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use JSON;
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sub initialize {
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my ($self, %conf) = @_;
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$self->{pbot}->{commands}->register(sub { $self->cmd_ps(@_) }, 'ps', 0);
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$self->{pbot}->{commands}->register(sub { $self->cmd_kill(@_) }, 'kill', 1);
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$self->{pbot}->{capabilities}->add('admin', 'can-kill', 1);
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$self->{processes} = {};
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# automatically reap children processes in background
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$SIG{CHLD} = sub {
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my $pid; do { $pid = waitpid(-1, WNOHANG); $self->remove_process($pid) if $pid > 0; } while $pid > 0;
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};
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}
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sub cmd_ps {
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my ($self, $context) = @_;
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my $usage = 'Usage: ps [-atu]; -a show all information; -t show running time; -u show user/channel';
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my $getopt_error;
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local $SIG{__WARN__} = sub {
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$getopt_error = shift;
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chomp $getopt_error;
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};
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Getopt::Long::Configure("bundling");
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my ($show_all, $show_user, $show_running_time);
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my @opt_args = $self->{pbot}->{interpreter}->split_line($context->{arguments}, strip_quotes => 1);
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GetOptionsFromArray(
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\@opt_args,
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'all|a' => \$show_all,
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'user|u' => \$show_user,
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'time|t' => \$show_running_time
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);
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return "$getopt_error; $usage" if defined $getopt_error;
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my @processes;
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foreach my $pid (sort keys %{$self->{processes}}) { push @processes, $self->{processes}->{$pid}; }
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if (not @processes) { return "No running processes."; }
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my $result;
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if (@processes == 1) { $result = 'One process: '; } else { $result = @processes . ' processes: '; }
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my $sep = '';
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foreach my $process (@processes) {
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$result .= $sep;
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$result .= "$process->{pid}: $process->{commands}->[0]";
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if ($show_running_time or $show_all) {
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my $duration = concise duration (gettimeofday - $process->{process_start});
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$result .= " [$duration]";
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}
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if ($show_user or $show_all) {
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$result .= " ($process->{nick} in $process->{from})";
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}
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$sep = '; ';
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}
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return $result;
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}
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sub cmd_kill {
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my ($self, $context) = @_;
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my $usage = 'Usage: kill [-a] [-t <seconds>] [-s <signal>] [pids...]; -a kill all processes; -t <seconds> kill processes running longer than <seconds>; -s send <signal> to processes';
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my $getopt_error;
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local $SIG{__WARN__} = sub {
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$getopt_error = shift;
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chomp $getopt_error;
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};
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Getopt::Long::Configure("bundling");
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my ($kill_all, $kill_time, $signal);
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my @opt_args = $self->{pbot}->{interpreter}->split_line($context->{arguments}, preserve_escapes => 1, strip_quotes => 1);
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GetOptionsFromArray(
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\@opt_args,
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'all|a' => \$kill_all,
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'time|t=i' => \$kill_time,
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'signal|s=s' => \$signal,
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);
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return "$getopt_error; $usage" if defined $getopt_error;
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return "Must specify PIDs to kill unless options -a or -t are provided." if not $kill_all and not $kill_time and not @opt_args;
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if (defined $signal) {
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$signal = uc $signal;
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} else {
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$signal = 'INT';
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}
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my @pids;
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if (defined $kill_all or defined $kill_time) {
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my $now = time;
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foreach my $pid (sort keys %{$self->{processes}}) {
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my $process = $self->{processes}->{$pid};
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next if defined $kill_time and $now - $process->{process_start} < $kill_time;
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push @pids, $pid;
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}
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} else {
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foreach my $pid (@opt_args) {
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return "No such pid $pid." if not exists $self->{processes}->{$pid};
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push @pids, $pid;
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}
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}
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return "No matching process." if not @pids;
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my $ret = eval { kill $signal, @pids };
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if ($@) { my $error = $@; $error =~ s/ at PBot.*//; return $error; }
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return "[$ret] Sent signal " . $signal . ' to ' . join ', ', @pids;
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}
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sub add_process {
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my ($self, $pid, $context) = @_;
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$context->{process_start} = gettimeofday;
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$self->{processes}->{$pid} = $context;
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$self->{pbot}->{logger}->log("Starting process $pid: $context->{commands}->[0]\n");
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}
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sub remove_process {
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my ($self, $pid) = @_;
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if (exists $self->{processes}->{$pid}) {
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my $command = $self->{processes}->{$pid}->{commands}->[0];
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my $duration = gettimeofday - $self->{processes}->{$pid}->{process_start};
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$duration = sprintf "%0.3f", $duration;
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$self->{pbot}->{logger}->log("Finished process $pid ($command): duration $duration seconds\n");
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delete $self->{processes}->{$pid};
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} else {
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$self->{pbot}->{logger}->log("Finished process $pid\n");
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}
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}
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sub execute_process {
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my ($self, $context, $subref, $timeout) = @_;
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$timeout //= 30;
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if (not exists $context->{commands}) { $context->{commands} = [$context->{command}]; }
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# don't fork again if we're already a forked process
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if (exists $context->{pid}) {
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$subref->($context);
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return $context->{result};
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}
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pipe(my $reader, my $writer);
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$context->{pid} = fork;
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if (not defined $context->{pid}) {
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$self->{pbot}->{logger}->log("Could not fork process: $!\n");
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close $reader;
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close $writer;
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$context->{checkflood} = 1;
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$self->{pbot}->{interpreter}->handle_result($context, "/me groans loudly.\n");
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return;
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}
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if ($context->{pid} == 0) {
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# child
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close $reader;
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$self->{pbot}->{child} = 1;
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# don't quit the IRC client when the child dies
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no warnings;
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*PBot::IRC::Connection::DESTROY = sub { return; };
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use warnings;
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# remove atexit handlers
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$self->{pbot}->{atexit}->unregister_all;
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# execute the provided subroutine, results are stored in $context
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eval {
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local $SIG{ALRM} = sub { die "Process `$context->{commands}->[0]` timed-out" };
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alarm $timeout;
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$subref->($context);
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};
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alarm 0;
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# check for errors
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if ($@) {
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$context->{result} = $@;
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$context->{'timed-out'} = 1 if $context->{result} =~ /^Process .* timed-out at PBot\/ProcessManager/;
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$self->{pbot}->{logger}->log("Error executing process: $context->{result}\n");
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$context->{result} =~ s/ at PBot.*$//ms;
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$context->{result} =~ s/\s+...propagated at .*$//ms;
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}
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# print $context to pipe
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my $json = encode_json $context;
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print $writer "$json\n";
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close $writer;
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# end child
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exit 0;
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} else {
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# parent
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close $writer;
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$self->add_process($context->{pid}, $context);
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$self->{pbot}->{select_handler}->add_reader($reader, sub { $self->process_pipe_reader($context->{pid}, @_) });
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# return empty string since reader will handle the output when child is finished
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return "";
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}
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}
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sub process_pipe_reader {
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my ($self, $pid, $buf) = @_;
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my $context = decode_json $buf or do {
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$self->{pbot}->{logger}->log("Failed to decode bad json: [$buf]\n");
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return;
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};
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delete $context->{pid};
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if (not defined $context->{result} or not length $context->{result}) {
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$self->{pbot}->{logger}->log("No result from process.\n");
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return if $context->{suppress_no_output};
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$context->{result} = "No output.";
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}
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if ($context->{referenced}) { return if $context->{result} =~ m/(?:no results)/i; }
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if (exists $context->{special} and $context->{special} eq 'code-factoid') {
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$context->{result} =~ s/\s+$//g;
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$self->{pbot}->{logger}->log("No text result from code-factoid.\n") and return if not length $context->{result};
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$context->{original_keyword} = $context->{root_keyword};
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$context->{result} = $self->{pbot}->{factoids}->handle_action($context, $context->{result});
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}
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$context->{checkflood} = 0;
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if (defined $context->{nickoverride}) { $self->{pbot}->{interpreter}->handle_result($context, $context->{result}); }
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else {
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# don't override nick if already set
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if ( exists $context->{special}
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and $context->{special} ne 'code-factoid'
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and $self->{pbot}->{factoids}->{factoids}->exists($context->{channel}, $context->{trigger}, 'add_nick')
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and $self->{pbot}->{factoids}->{factoids}->get_data($context->{channel}, $context->{trigger}, 'add_nick') != 0)
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{
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$context->{nickoverride} = $context->{nick};
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$context->{no_nickoverride} = 0;
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$context->{force_nickoverride} = 1;
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} else {
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# extract nick-like thing from module result
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if ($context->{result} =~ s/^(\S+): //) {
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my $nick = $1;
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if (lc $nick eq "usage") {
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# put it back on result if it's a usage message
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$context->{result} = "$nick: $context->{result}";
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} else {
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my $present = $self->{pbot}->{nicklist}->is_present($context->{channel}, $nick);
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if ($present) {
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# nick is present in channel
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$context->{nickoverride} = $present;
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} else {
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# nick not present, put it back on result
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$context->{result} = "$nick: $context->{result}";
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}
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}
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}
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}
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$self->{pbot}->{interpreter}->handle_result($context, $context->{result});
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}
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my $text = $self->{pbot}->{interpreter}
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->truncate_result($context->{channel}, $self->{pbot}->{registry}->get_value('irc', 'botnick'), 'undef', $context->{result}, $context->{result}, 0);
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$self->{pbot}->{antiflood}
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->check_flood($context->{from}, $self->{pbot}->{registry}->get_value('irc', 'botnick'), $self->{pbot}->{registry}->get_value('irc', 'username'), 'pbot', $text, 0, 0, 0);
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}
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1;
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