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Manual Reference Pages  -  MOJO::SERVER::PREFORK (3)

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NAME

Mojo::Server::Prefork - Preforking non-blocking I/O HTTP and WebSocket server

CONTENTS

SYNOPSIS



  use Mojo::Server::Prefork;

  my $prefork = Mojo::Server::Prefork->new(listen => [http://*:8080]);
  $prefork->unsubscribe(request)->on(request => sub {
    my ($prefork, $tx) = @_;

    # Request
    my $method = $tx->req->method;
    my $path   = $tx->req->url->path;

    # Response
    $tx->res->code(200);
    $tx->res->headers->content_type(text/plain);
    $tx->res->body("$method request for $path!");

    # Resume transaction
    $tx->resume;
  });
  $prefork->run;



DESCRIPTION

Mojo::Server::Prefork is a full featured, UNIX optimized, preforking non-blocking I/O HTTP and WebSocket server, built around the very well tested and reliable Mojo::Server::Daemon, with IPv6, TLS, SNI, Comet (long polling), keep-alive and multiple event loop support. Note that the server uses signals for process management, so you should avoid modifying signal handlers in your applications.

For better scalability (epoll, kqueue) and to provide non-blocking name resolution, SOCKS5 as well as TLS support, the optional modules EV (4.0+), Net::DNS::Native (0.15+), IO::Socket::Socks (0.64+) and IO::Socket::SSL (1.84+) will be used automatically if possible. Individual features can also be disabled with the MOJO_NO_NDN, MOJO_NO_SOCKS and MOJO_NO_TLS environment variables.

See DEPLOYMENT in Mojolicious::Guides::Cookbook for more.

MANAGER SIGNALS

The Mojo::Server::Prefork manager process can be controlled at runtime with the following signals.

    INT, TERM

Shut down server immediately.

    QUIT

Shut down server gracefully.

    TTIN

Increase worker pool by one.

    TTOU

Decrease worker pool by one.

WORKER SIGNALS

Mojo::Server::Prefork worker processes can be controlled at runtime with the following signals.

    QUIT

Stop worker gracefully.

EVENTS

Mojo::Server::Prefork inherits all events from Mojo::Server::Daemon and can emit the following new ones.

    finish



  $prefork->on(finish => sub {
    my ($prefork, $graceful) = @_;
    ...
  });



Emitted when the server shuts down.



  $prefork->on(finish => sub {
    my ($prefork, $graceful) = @_;
    say $graceful ? Graceful server shutdown : Server shutdown;
  });



    heartbeat



  $prefork->on(heartbeat => sub {
    my ($prefork, $pid) = @_;
    ...
  });



Emitted when a heartbeat message has been received from a worker.



  $prefork->on(heartbeat => sub {
    my ($prefork, $pid) = @_;
    say "Worker $pid has a heartbeat";
  });



    reap



  $prefork->on(reap => sub {
    my ($prefork, $pid) = @_;
    ...
  });



Emitted when a child process dies.



  $prefork->on(reap => sub {
    my ($prefork, $pid) = @_;
    say "Worker $pid stopped";
  });



    spawn



  $prefork->on(spawn => sub {
    my ($prefork, $pid) = @_;
    ...
  });



Emitted when a worker process is spawned.



  $prefork->on(spawn => sub {
    my ($prefork, $pid) = @_;
    say "Worker $pid started";
  });



    wait



  $prefork->on(wait => sub {
    my $prefork = shift;
    ...
  });



Emitted when the manager starts waiting for new heartbeat messages.



  $prefork->on(wait => sub {
    my $prefork = shift;
    my $workers = $prefork->workers;
    say "Waiting for heartbeat messages from $workers workers";
  });



ATTRIBUTES

Mojo::Server::Prefork inherits all attributes from Mojo::Server::Daemon and implements the following new ones.

    accepts



  my $accepts = $prefork->accepts;
  $prefork    = $prefork->accepts(100);



Maximum number of connections a worker is allowed to accept, before stopping gracefully and then getting replaced with a newly started worker, passed along to max_accepts in Mojo::IOLoop, defaults to 10000. Setting the value to 0 will allow workers to accept new connections indefinitely. Note that up to half of this value can be subtracted randomly to improve load balancing.

    cleanup



  my $bool = $prefork->cleanup;
  $prefork = $prefork->cleanup($bool);



Delete pid_file automatically once it is not needed anymore, defaults to a true value.

    graceful_timeout



  my $timeout = $prefork->graceful_timeout;
  $prefork    = $prefork->graceful_timeout(15);



Maximum amount of time in seconds stopping a worker gracefully may take before being forced, defaults to 20.

    heartbeat_interval



  my $interval = $prefork->heartbeat_interval;
  $prefork     = $prefork->heartbeat_interval(3);



Heartbeat interval in seconds, defaults to 5.

    heartbeat_timeout



  my $timeout = $prefork->heartbeat_timeout;
  $prefork    = $prefork->heartbeat_timeout(2);



Maximum amount of time in seconds before a worker without a heartbeat will be stopped gracefully, defaults to 20.

    pid_file



  my $file = $prefork->pid_file;
  $prefork = $prefork->pid_file(/tmp/prefork.pid);



Full path of process id file, defaults to prefork.pid in a temporary directory.

    workers



  my $workers = $prefork->workers;
  $prefork    = $prefork->workers(10);



Number of worker processes, defaults to 4. A good rule of thumb is two worker processes per CPU core for applications that perform mostly non-blocking operations, blocking operations often require more and benefit from decreasing concurrency with clients in Mojo::Server::Daemon (often as low as 1).

METHODS

Mojo::Server::Prefork inherits all methods from Mojo::Server::Daemon and implements the following new ones.

    check_pid



  my $pid = $prefork->check_pid;



Get process id for running server from pid_file or delete it if server is not running.



  say Server is not running unless $prefork->check_pid;



    ensure_pid_file



  $prefork->ensure_pid_file;



Ensure pid_file exists.

    healthy



  my $healthy = $prefork->healthy;



Number of currently active worker processes with a heartbeat.

    run



  $prefork->run;



Run server and wait for MANAGER SIGNALS.

SEE ALSO

Mojolicious, Mojolicious::Guides, <http://mojolicious.org>.
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perl v5.20.3 MOJO::SERVER::PREFORK (3) 2016-03-15

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