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368 lines
11 KiB
Perl
368 lines
11 KiB
Perl
# File: ProcessManager.pm
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#
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# Purpose: Handles forking and execution of module/subroutine processes.
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# Provides commands to list running processes and to kill them.
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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 PBot::Imports;
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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 ($self, %conf) = @_;
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# process manager bot commands
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$self->{pbot}->{commands}->register(sub { $self->cmd_ps(@_) }, 'ps', 0);
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$self->{pbot}->{commands}->register(sub { $self->cmd_kill(@_) }, 'kill', 1);
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# give admin capability group the can-kill capability
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$self->{pbot}->{capabilities}->add('admin', 'can-kill', 1);
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# hash of currently running bot-invoked processes
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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}}) {
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push @processes, $self->{processes}->{$pid};
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}
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if (not @processes) {
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return "No running processes.";
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}
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my $result = @processes == 1 ? 'One process: ' : @processes . ' processes: ';
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my @entries;
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foreach my $process (@processes) {
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my $entry = "$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 - $process->{process_start});
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$entry .= " [$duration]";
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}
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if ($show_user or $show_all) {
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$entry .= " ($process->{nick} in $process->{from})";
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}
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push @entries, $entry;
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}
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$result .= join '; ', @entries;
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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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if (not $kill_all and not $kill_time and not @opt_args) {
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return "Must specify PIDs to kill unless options -a or -t are provided.";
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}
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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 $signal, @pids };
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if ($@) {
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my $error = $@;
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$error =~ s/ at PBot.*//;
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return $error;
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}
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return "[$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; # default timeout 30 seconds
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# ensure contextual command history list is available for add_process()
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if (not exists $context->{commands}) {
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$context->{commands} = [$context->{command}];
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}
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# don't fork again if we're already a forked process
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if (defined $context->{pid} and $context->{pid} == 0) {
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$subref->($context);
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return $context->{result};
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}
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pipe(my $reader, my $writer);
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# fork new process
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$context->{pid} = fork;
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if (not defined $context->{pid}) {
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# fork failed
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$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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delete $context->{pid};
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# groan to let the users know something went wrong
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$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 $reader;
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# flag this instance as child
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$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->($context);
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alarm 0;
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};
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# check for errors
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if ($@) {
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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: $context->{result}\n");
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# strip internal PBot source data for IRC output
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$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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# nothing to write to child
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close $writer;
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# add process
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$self->add_process($context->{pid}, $context);
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# add reader handler
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$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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# retrieve context object from child
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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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# context is no longer forked
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delete $context->{pid};
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# check for output
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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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# don't output unnecessary result if command was referenced within a message
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if ($context->{referenced}) {
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return if $context->{result} =~ m/(?:no results)/i;
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}
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# handle code factoid result
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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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if (not length $context->{result}) {
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$self->{pbot}->{logger}->log("No text result from code-factoid.\n");
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return;
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}
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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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# if nick isn't overridden yet, check for a potential nick prefix
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# TODO: this stuff should be moved to Interpreter::output_result
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if (not $context->{nickprefix}) {
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# if add_nick is set on the factoid, set the nick override to the caller's nick
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if (exists $context->{special} and $context->{special} ne 'code-factoid'
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and $self->{pbot}->{factoids}->{storage}->exists($context->{channel}, $context->{trigger}, 'add_nick')
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and $self->{pbot}->{factoids}->{storage}->get_data($context->{channel}, $context->{trigger}, 'add_nick') != 0)
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{
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$context->{nickprefix} = $context->{nick};
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$context->{nickprefix_disabled} = 0;
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$context->{nickprefix_forced} = 1;
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} else {
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# extract nick-like thing from process result
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if ($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->{nickprefix} = $present;
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} else {
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# nick not present, put it back on result
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$context->{result} = "$nick: $context->{result}";
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}
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}
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}
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}
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}
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# send the result off to the bot to be handled
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$context->{checkflood} = 1;
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$self->{pbot}->{interpreter}->handle_result($context);
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}
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1;
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