/usr/share/perl5/Mojo/Server/Hypnotoad.pm is in libmojolicious-perl 2.98+dfsg-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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use Mojo::Base -base;
use Cwd 'abs_path';
use Fcntl ':flock';
use File::Basename 'dirname';
use File::Spec::Functions qw(catfile tmpdir);
use IO::Poll 'POLLIN';
use List::Util 'shuffle';
use Mojo::Server::Daemon;
use POSIX qw(setsid WNOHANG);
use Scalar::Util 'weaken';
use Time::HiRes 'ualarm';
sub DESTROY {
my $self = shift;
# Worker or command
return unless $self->{finished};
# Manager
if (my $file = $self->{config}{pid_file}) { unlink $file if -w $file }
if (my $file = $self->{config}{lock_file}) { unlink $file if -w $file }
}
# "Marge? Since I'm not talking to Lisa,
# would you please ask her to pass me the syrup?
# Dear, please pass your father the syrup, Lisa.
# Bart, tell Dad I will only pass the syrup if it won't be used on any meat
# product.
# You dunkin' your sausages in that syrup homeboy?
# Marge, tell Bart I just want to drink a nice glass of syrup like I do
# every morning.
# Tell him yourself, you're ignoring Lisa, not Bart.
# Bart, thank your mother for pointing that out.
# Homer, you're not not-talking to me and secondly I heard what you said.
# Lisa, tell your mother to get off my case.
# Uhhh, dad, Lisa's the one you're not talking to.
# Bart, go to your room."
sub run {
my ($self, $path) = @_;
# No windows support
_exit('Hypnotoad not available for Windows.') if $^O eq 'MSWin32';
# Application
$ENV{HYPNOTOAD_APP} ||= abs_path $path;
# This is a production server
$ENV{MOJO_MODE} ||= 'production';
# Executable
$ENV{HYPNOTOAD_EXE} ||= $0;
$0 = $ENV{HYPNOTOAD_APP};
# Clean start
die "Can't exec: $!" if !$ENV{HYPNOTOAD_REV}++ && !exec $ENV{HYPNOTOAD_EXE};
# Preload application and configure server
my $daemon = $self->{daemon} = Mojo::Server::Daemon->new;
my $app = $daemon->load_app($ENV{HYPNOTOAD_APP});
$self->_config($app);
# Testing
_exit('Everything looks good!') if $ENV{HYPNOTOAD_TEST};
# Stop running server
$self->_stop if $ENV{HYPNOTOAD_STOP};
# Initiate hot deployment
$self->_hot_deploy unless $ENV{HYPNOTOAD_PID};
# Daemonize as early as possible (but not for restarts)
if (!$ENV{HYPNOTOAD_FOREGROUND} && $ENV{HYPNOTOAD_REV} < 3) {
# Fork and kill parent
die "Can't fork: $!" unless defined(my $pid = fork);
exit 0 if $pid;
setsid or die "Can't start a new session: $!";
# Close file handles
open STDIN, '</dev/null';
open STDOUT, '>/dev/null';
open STDERR, '>&STDOUT';
}
# Start accepting connections
my $log = $self->{log} = $app->log;
$log->info(qq[Hypnotoad server $$ started for "$ENV{HYPNOTOAD_APP}".]);
$daemon->start;
# Pipe for worker communication
pipe($self->{reader}, $self->{writer}) or die "Can't create pipe: $!";
$self->{poll} = IO::Poll->new;
$self->{poll}->mask($self->{reader}, POLLIN);
# Manager environment
my $c = $self->{config};
$SIG{INT} = $SIG{TERM} = sub { $self->{finished} = 1 };
$SIG{CHLD} = sub {
while ((my $pid = waitpid -1, WNOHANG) > 0) { $self->_reap($pid) }
};
$SIG{QUIT} = sub { $self->{finished} = $self->{graceful} = 1 };
$SIG{USR2} = sub { $self->{upgrade} ||= time };
$SIG{TTIN} = sub { $c->{workers}++ };
$SIG{TTOU} = sub {
return unless $c->{workers} && $c->{workers}--;
$self->{workers}{shuffle keys %{$self->{workers}}}{graceful} ||= time;
};
# Mainloop
$self->_manage while 1;
}
sub _config {
my ($self, $app) = @_;
# Hypnotoad settings
my $c = $self->{config} = $app->config('hypnotoad') || {};
$c->{graceful_timeout} ||= 30;
$c->{heartbeat_interval} ||= 5;
$c->{heartbeat_timeout} ||= 20;
$c->{lock_file} ||= catfile tmpdir, 'hypnotoad.lock';
$c->{lock_file} .= ".$$";
$c->{lock_timeout} ||= 0.5;
$c->{pid_file} ||= catfile dirname($ENV{HYPNOTOAD_APP}), 'hypnotoad.pid';
$c->{upgrade_timeout} ||= 60;
$c->{workers} ||= 4;
# Daemon settings
$ENV{MOJO_REVERSE_PROXY} = $c->{proxy} if defined $c->{proxy};
my $daemon = $self->{daemon};
$daemon->backlog($c->{backlog}) if defined $c->{backlog};
$daemon->max_clients($c->{clients} || 1000);
$daemon->group($c->{group}) if defined $c->{group};
$daemon->max_requests($c->{keep_alive_requests} || 25);
$daemon->inactivity_timeout($c->{inactivity_timeout} // 15);
$daemon->user($c->{user}) if defined $c->{user};
$daemon->ioloop->max_accepts($c->{accepts} // 1000);
$daemon->listen($c->{listen} || ['http://*:8080']);
}
sub _exit { say shift and exit 0 }
sub _heartbeat {
my $self = shift;
# Poll for heartbeats
my $poll = $self->{poll};
$poll->poll(1);
return unless $poll->handles(POLLIN);
return unless $self->{reader}->sysread(my $chunk, 4194304);
# Update heartbeats
$self->{workers}{$1} and $self->{workers}{$1}{time} = time
while $chunk =~ /(\d+)\n/g;
}
sub _hot_deploy {
my $self = shift;
# Make sure server is running
return unless my $pid = $self->_pid;
return unless kill 0, $pid;
# Start hot deployment
kill 'USR2', $pid;
_exit("Starting hot deployment for Hypnotoad server $pid.");
}
sub _manage {
my $self = shift;
# Housekeeping
my $c = $self->{config};
if (!$self->{finished}) {
# Spawn more workers
$self->_spawn while keys %{$self->{workers}} < $c->{workers};
# Check PID file
$self->_pid_file;
}
# Shutdown
elsif (!keys %{$self->{workers}}) { exit 0 }
# Upgraded
if ($ENV{HYPNOTOAD_PID} && $ENV{HYPNOTOAD_PID} ne $$) {
$self->{log}->info("Upgrade successful, stopping $ENV{HYPNOTOAD_PID}.");
kill 'QUIT', $ENV{HYPNOTOAD_PID};
}
$ENV{HYPNOTOAD_PID} = $$;
# Check heartbeat
$self->_heartbeat;
# Upgrade
if ($self->{upgrade} && !$self->{finished}) {
# Fresh start
unless ($self->{new}) {
$self->{log}->info('Starting zero downtime software upgrade.');
die "Can't fork: $!" unless defined(my $pid = $self->{new} = fork);
exec($ENV{HYPNOTOAD_EXE}) or die("Can't exec: $!") unless $pid;
}
# Timeout
kill 'KILL', $self->{new}
if $self->{upgrade} + $c->{upgrade_timeout} <= time;
}
# Workers
while (my ($pid, $w) = each %{$self->{workers}}) {
# No heartbeat (graceful stop)
my $interval = $c->{heartbeat_interval};
my $timeout = $c->{heartbeat_timeout};
if ($w->{time} + $interval + $timeout <= time) {
$self->{log}->info("Worker $pid has no heartbeat, restarting.");
$w->{graceful} ||= time;
}
# Graceful stop with timeout
$w->{graceful} ||= time if $self->{graceful};
if ($w->{graceful}) {
$self->{log}->debug("Trying to stop worker $pid gracefully.");
kill 'QUIT', $pid;
$w->{force} = 1 if $w->{graceful} + $c->{graceful_timeout} <= time;
}
# Normal stop
if (($self->{finished} && !$self->{graceful}) || $w->{force}) {
$self->{log}->debug("Stopping worker $pid.");
kill 'KILL', $pid;
}
}
}
sub _pid {
return unless open my $file, '<', shift->{config}{pid_file};
my $pid = <$file>;
chomp $pid;
return $pid;
}
sub _pid_file {
my $self = shift;
# Don't need a PID file anymore
return if $self->{finished};
# Check if PID file already exists
return if -e (my $file = $self->{config}{pid_file});
# Create PID file
$self->{log}->info(qq{Creating process id file "$file".});
die qq{Can't create process id file "$file": $!}
unless open my $pid, '>', $file;
chmod 0644, $pid;
print $pid $$;
}
# "Dear Mr. President, there are too many states nowadays.
# Please eliminate three.
# P.S. I am not a crackpot."
sub _reap {
my ($self, $pid) = @_;
# Clean up failed upgrade
if (($self->{new} || '') eq $pid) {
$self->{log}->info('Zero downtime software upgrade failed.');
delete $self->{upgrade};
delete $self->{new};
}
# Clean up worker
else {
$self->{log}->debug("Worker $pid stopped.");
delete $self->{workers}{$pid};
}
}
# "I hope this has taught you kids a lesson: kids never learn."
sub _spawn {
my $self = shift;
# Manager
die "Can't fork: $!" unless defined(my $pid = fork);
return $self->{workers}{$pid} = {time => time} if $pid;
# Prepare lock file
my $c = $self->{config};
my $file = $c->{lock_file};
die qq{Can't open lock file "$file": $!} unless open my $lock, '>', $file;
# Change user/group
my $loop = $self->{daemon}->setuidgid->ioloop;
# Accept mutex
$loop->lock(
sub {
# Blocking
my $l;
if ($_[1]) {
eval {
local $SIG{ALRM} = sub { die "alarm\n" };
my $old = ualarm $c->{lock_timeout} * 1000000;
$l = flock $lock, LOCK_EX;
ualarm $old;
};
if ($@) { $l = $@ eq "alarm\n" ? 0 : die($@) }
}
# Non blocking
else { $l = flock $lock, LOCK_EX | LOCK_NB }
return $l;
}
);
$loop->unlock(sub { flock $lock, LOCK_UN });
# Heartbeat
weaken $self;
$loop->recurring(
$c->{heartbeat_interval} => sub {
return unless shift->max_connections;
$self->{writer}->syswrite("$$\n") or exit 0;
}
);
# Clean worker environment
$SIG{INT} = $SIG{TERM} = $SIG{CHLD} = $SIG{USR2} = $SIG{TTIN} = $SIG{TTOU}
= 'DEFAULT';
$SIG{QUIT} = sub { $loop->max_connections(0) };
delete $self->{reader};
delete $self->{poll};
# Start
$self->{log}->debug("Worker $$ started.");
$loop->start;
exit 0;
}
sub _stop {
_exit('Hypnotoad server not running.') unless my $pid = shift->_pid;
kill 'QUIT', $pid;
_exit("Stopping Hypnotoad server $pid gracefully.");
}
1;
=head1 NAME
Mojo::Server::Hypnotoad - ALL GLORY TO THE HYPNOTOAD!
=head1 SYNOPSIS
use Mojo::Server::Hypnotoad;
my $toad = Mojo::Server::Hypnotoad->new;
$toad->run('./myapp.pl');
=head1 DESCRIPTION
L<Mojo::Server::Hypnotoad> is a full featured UNIX optimized preforking
non-blocking I/O HTTP 1.1 and WebSocket server built around the very well
tested and reliable L<Mojo::Server::Daemon> with C<IPv6>, C<TLS>, C<libev> and
hot deployment support that just works.
To start applications with it you can use the L<hypnotoad> script.
$ hypnotoad myapp.pl
Server available at http://127.0.0.1:8080.
You can run the exact same command again for automatic hot deployment.
$ hypnotoad myapp.pl
Starting hot deployment for Hypnotoad server 31841.
For L<Mojolicious> and L<Mojolicious::Lite> applications it will default to
C<production> mode.
Optional modules L<EV>, L<IO::Socket::INET6> and L<IO::Socket::SSL> are
supported transparently and used if installed. Individual features can also be
disabled with the C<MOJO_NO_IPV6> and C<MOJO_NO_TLS> environment variables.
See L<Mojolicious::Guides::Cookbook> for more.
=head1 SIGNALS
L<Mojo::Server::Hypnotoad> can be controlled at runtime with the following
signals.
=head2 Manager
=over 2
=item C<INT>, C<TERM>
Shutdown server immediately.
=item C<QUIT>
Shutdown server gracefully.
=item C<TTIN>
Increase worker pool by one.
=item C<TTOU>
Decrease worker pool by one.
=item C<USR2>
Attempt zero downtime software upgrade (hot deployment) without losing any
incoming connections.
Manager (old)
|- Worker [1]
|- Worker [2]
|- Worker [3]
|- Worker [4]
+- Manager (new)
|- Worker [1]
|- Worker [2]
|- Worker [3]
+- Worker [4]
The new manager will automatically send a C<QUIT> signal to the old manager
and take over serving requests after starting up successfully.
=back
=head2 Worker
=over 2
=item C<INT>, C<TERM>
Stop worker immediately.
=item C<QUIT>
Stop worker gracefully.
=back
=head1 SETTINGS
L<Mojo::Server::Hypnotoad> can be configured with the following settings, see
L<Mojolicious::Guides::Cookbook/"Hypnotoad"> for examples.
=head2 C<accepts>
accepts => 100
Maximum number of connections a worker is allowed to accept before stopping
gracefully, defaults to C<1000>. Setting the value to C<0> will allow workers
to accept new connections indefinitely.
=head2 C<backlog>
backlog => 128
Listen backlog size, defaults to C<SOMAXCONN>.
=head2 C<clients>
clients => 100
Maximum number of parallel client connections per worker process, defaults to
C<1000>. Note that depending on how much your application may block, you might
want to decrease this value and increase C<workers> instead for better
performance.
=head2 C<graceful_timeout>
graceful_timeout => 15
Maximum amount of time in seconds a graceful worker stop may take before being
forced, defaults to C<30>.
=head2 C<group>
group => 'staff'
Group name for worker processes.
=head2 C<heartbeat_interval>
heartbeat_interval => 3
Heartbeat interval in seconds, defaults to C<5>.
=head2 C<heartbeat_timeout>
heartbeat_timeout => 2
Maximum amount of time in seconds before a worker without a heartbeat will be
stopped, defaults to C<20>.
=head2 C<inactivity_timeout>
inactivity_timeout => 10
Maximum amount of time in seconds a connection can be inactive before getting
closed, defaults to C<15>. Setting the value to C<0> will allow connections to
be inactive indefinitely.
=head2 C<keep_alive_requests>
keep_alive_requests => 50
Number of keep alive requests per connection, defaults to C<25>.
=head2 C<listen>
listen => ['http://*:80']
List of one or more locations to listen on, defaults to C<http://*:8080>. See
also L<Mojo::Server::Daemon/"listen"> for more examples.
=head2 C<lock_file>
lock_file => '/tmp/hypnotoad.lock'
Full path of accept mutex lock file prefix, to which the process id will be
appended, defaults to a random temporary path.
=head2 C<lock_timeout>
lock_timeout => 1
Maximum amount of time in seconds a worker may block when waiting for the
accept mutex, defaults to C<0.5>.
=head2 C<pid_file>
pid_file => '/var/run/hypnotoad.pid'
Full path to process id file, defaults to C<hypnotoad.pid> in the same
directory as the application. Note that this value can only be changed after
the server has been stopped.
=head2 C<proxy>
proxy => 1
Activate reverse proxy support, defaults to the value of the
C<MOJO_REVERSE_PROXY> environment variable.
=head2 C<upgrade_timeout>
upgrade_timeout => 30
Maximum amount of time in seconds a zero downtime software upgrade may take
before getting canceled, defaults to C<60>.
=head2 C<user>
user => 'sri'
Username for worker processes.
=head2 C<workers>
workers => 10
Number of worker processes, defaults to C<4>. A good rule of thumb is two
worker processes per cpu core.
=head1 METHODS
L<Mojo::Server::Hypnotoad> inherits all methods from L<Mojo::Base> and
implements the following new ones.
=head2 C<run>
$toad->run('script/myapp');
Run server for application.
=head1 SEE ALSO
L<Mojolicious>, L<Mojolicious::Guides>, L<http://mojolicio.us>.
=cut
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