Mojo::IOLoop - Minimalistic reactor for non-blocking TCP clients and servers
use Mojo::IOLoop; # Listen on port 3000 Mojo::IOLoop->server({port => 3000} => sub { my ($loop, $stream) = @_; $stream->on(read => sub { my ($stream, $chunk) = @_; # Process input say $chunk; # Got some data, time to write $stream->write('HTTP/1.1 200 OK'); }); }); # Connect to port 3000 my $id = Mojo::IOLoop->client({port => 3000} => sub { my ($loop, $err, $stream) = @_; $stream->on(read => sub { my ($stream, $chunk) = @_; # Process input say "Input: $chunk"; }); # Write request $stream->write("GET / HTTP/1.1\r\n\r\n"); }); # Add a timer Mojo::IOLoop->timer(5 => sub { my $loop = shift; $loop->remove($id); }); # Start loop if necessary Mojo::IOLoop->start unless Mojo::IOLoop->is_running;
Mojo::IOLoop is a very minimalistic reactor based on Mojo::Reactor, it has been reduced to the absolute minimal feature set required to build solid and scalable non-blocking TCP clients and servers.
Optional modules EV, IO::Socket::IP and IO::Socket::SSL are supported transparently and used if installed. Individual features can also be disabled with the MOJO_NO_IPV6 and MOJO_NO_TLS environment variables.
MOJO_NO_IPV6
MOJO_NO_TLS
A TLS certificate and key are also built right in to make writing test servers as easy as possible. Also note that for convenience the PIPE signal will be set to IGNORE when Mojo::IOLoop is loaded.
PIPE
IGNORE
Mojo::IOLoop implements the following attributes.
client_class
my $class = $loop->client_class; $loop = $loop->client_class('Mojo::IOLoop::Client');
Class to be used for opening TCP connections with the client method, defaults to Mojo::IOLoop::Client.
client
lock
my $cb = $loop->lock; $loop = $loop->lock(sub {...});
A locking callback that decides if this loop is allowed to accept new incoming connections, used to sync multiple server processes. The callback should return true or false. Note that exceptions in this callback are not captured.
$loop->lock(sub { my ($loop, $blocking) = @_; # Got the lock, listen for new connections return 1; });
max_accepts
my $max = $loop->max_accepts; $loop = $loop->max_accepts(1000);
The maximum number of connections this loop is allowed to accept before shutting down gracefully without interrupting existing connections, defaults to 0. Setting the value to 0 will allow this loop to accept new connections indefinitely.
0
max_connections
my $max = $loop->max_connections; $loop = $loop->max_connections(1000);
The maximum number of parallel connections this loop is allowed to handle before stopping to accept new incoming connections, defaults to 1000. Setting the value to 0 will make this loop stop accepting new connections and allow it to shutdown gracefully without interrupting existing connections.
1000
reactor
my $reactor = $loop->reactor; $loop = $loop->reactor(Mojo::Reactor->new);
Low level event reactor, usually a Mojo::Reactor::Poll or Mojo::Reactor::EV object.
server_class
my $class = $loop->server_class; $loop = $loop->server_class('Mojo::IOLoop::Server');
Class to be used for accepting TCP connections with the server method, defaults to Mojo::IOLoop::Server.
server
stream_class
my $class = $loop->stream_class; $loop = $loop->stream_class('Mojo::IOLoop::Stream');
Class to be used by client and server methods for I/O streams, defaults to Mojo::IOLoop::Stream.
unlock
my $cb = $loop->unlock; $loop = $loop->unlock(sub {...});
A callback to free the accept lock, used to sync multiple server processes. Note that exceptions in this callback are not captured.
Mojo::IOLoop inherits all methods from Mojo::Base and implements the following new ones.
my $id = Mojo::IOLoop->client(address => '127.0.0.1', port => 3000, sub {...}); my $id = $loop->client(address => '127.0.0.1', port => 3000, sub {...}); my $id = $loop->client({address => '127.0.0.1', port => 3000}, sub {...});
Open TCP connection with client_class, which is usually Mojo::IOLoop::Client, takes the same arguments as "connect" in Mojo::IOLoop::Client.
Mojo::IOLoop->client({port => 3000} => sub { my ($loop, $err, $stream) = @_; ... });
delay
my $delay = Mojo::IOLoop->delay; my $delay = $loop->delay; my $delay = $loop->delay(sub {...});
Get Mojo::IOLoop::Delay object to synchronize events and subscribe to event "finish" in Mojo::IOLoop::Delay if optional callback is provided.
# Synchronize multiple events my $delay = Mojo::IOLoop->delay(sub { say 'BOOM!' }); for my $i (1 .. 10) { $delay->begin; Mojo::IOLoop->timer($i => sub { say 10 - $i; $delay->end; }); } # Wait for events if necessary $delay->wait unless Mojo::IOLoop->is_running;
generate_port
my $port = Mojo::IOLoop->generate_port; my $port = $loop->generate_port;
Find a free TCP port, this is a utility function primarily used for tests.
is_running
my $success = Mojo::IOLoop->is_running; my $success = $loop->is_running;
Check if loop is running.
exit unless Mojo::IOLoop->is_running;
one_tick
Mojo::IOLoop->one_tick; $loop->one_tick;
Run reactor until at least one event has been handled or no events are being watched anymore. Note that this method can recurse back into the reactor, so you need to be careful.
recurring
my $id = Mojo::IOLoop->recurring(0 => sub {...}); my $id = $loop->recurring(3 => sub {...});
Create a new recurring timer, invoking the callback repeatedly after a given amount of time in seconds.
remove
Mojo::IOLoop->remove($id); $loop->remove($id);
Remove anything with an id. Connections will be dropped gracefully by allowing them to finish writing all data in their write buffers.
my $id = Mojo::IOLoop->server(port => 3000, sub {...}); my $id = $loop->server(port => 3000, sub {...}); my $id = $loop->server({port => 3000}, sub {...});
Accept TCP connections with server_class, which is usually Mojo::IOLoop::Server, takes the same arguments as "listen" in Mojo::IOLoop::Server.
Mojo::IOLoop->server({port => 3000} => sub { my ($loop, $stream, $id) = @_; ... });
singleton
my $loop = Mojo::IOLoop->singleton;
The global Mojo::IOLoop singleton, used to access a single shared loop object from everywhere inside the process.
# Many methods also allow you to take shortcuts Mojo::IOLoop->timer(2 => sub { Mojo::IOLoop->stop }); Mojo::IOLoop->start;
start
Mojo::IOLoop->start; $loop->start;
Start the loop, this will block until stop is called or no events are being watched anymore.
stop
Mojo::IOLoop->stop; $loop->stop;
Stop the loop immediately, this will not interrupt any existing connections and the loop can be restarted by running start again.
stream
my $stream = Mojo::IOLoop->stream($id); my $stream = $loop->stream($id); my $id = $loop->stream($stream);
Get Mojo::IOLoop::Stream object for id or turn object into a connection.
# Increase inactivity timeout for connection to 300 seconds Mojo::IOLoop->stream($id)->timeout(300);
timer
my $id = Mojo::IOLoop->timer(5 => sub {...}); my $id = $loop->timer(5 => sub {...}); my $id = $loop->timer(0.25 => sub {...});
Create a new timer, invoking the callback after a given amount of time in seconds.
You can set the MOJO_IOLOOP_DEBUG environment variable to get some advanced diagnostics information printed to STDERR.
MOJO_IOLOOP_DEBUG
STDERR
MOJO_IOLOOP_DEBUG=1
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cpanm
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