Mojo::IOLoop - Minimalistic Reactor For TCP Clients And Servers
use Mojo::IOLoop; # Create loop my $loop = Mojo::IOLoop->new; # Listen on port 3000 $loop->listen( port => 3000, cb => sub { my ($self, $id) = @_; # Start read only when accepting a new connection $self->not_writing($id); # Incoming data $self->read_cb($id => sub { my ($self, $id, $chunk) = @_; # Got some data, time to write $self->writing($id); }); # Ready to write $self->write_cb($id => sub { my ($self, $id) = @_; # Back to reading only $self->not_writing($id); # The loop will take care of buffering for us return 'HTTP/1.1 200 OK'; }); } ); # Connect to port 3000 with TLS activated my $id = $loop->connect(address => 'localhost', port => 3000, tls => 1); # Loop starts writing $loop->writing($id); # Writing request $loop->write_cb($id => sub { my ($self, $id) = @_; # Back to reading only $self->not_writing($id); # The loop will take care of buffering for us return "GET / HTTP/1.1\r\n\r\n"; }); # Reading response $loop->read_cb($id => sub { my ($self, $id, $chunk) = @_; # Time to write more $self->writing($id); }); # Add a timer $loop->timer(5 => sub { my $self = shift; $self->drop($id); }); # Start and stop loop $loop->start; $loop->stop;
Mojo::IOLoop is a very minimalistic reactor that has been reduced to the absolute minimal feature set required to build solid and scalable TCP clients and servers.
Optional modules IO::KQueue, IO::Epoll, IO::Socket::INET6 and IO::Socket::SSL are supported transparently and used if installed.
Mojo::IOLoop implements the following attributes.
accept_timeout
my $timeout = $loop->accept_timeout; $loop = $loop->accept_timeout(5);
Maximum time in seconds a connection can take to be accepted before being dropped, defaults to 5.
5
connect_timeout
my $timeout = $loop->connect_timeout; $loop = $loop->connect_timeout(5);
Maximum time in seconds a conenction can take to be connected before being dropped, defaults to 5.
lock_cb
my $cb = $loop->lock_cb; $loop = $loop->lock_cb(sub {...});
A locking callback that decides if this loop is allowed to listen for new incoming connections, used to sync multiple server processes. The callback should return true or false.
$loop->lock_cb(sub { my ($loop, $blocking) = @_; # Got the lock, listen for new connections return 1; });
max_connections
my $max = $loop->max_connections; $loop = $loop->max_connections(1000);
The maximum number of 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
0
tick_cb
my $cb = $loop->tick_cb; $loop = $loop->tick_cb(sub {...});
Callback to be invoked on every reactor tick, this for example allows you to run multiple reactors next to each other.
timeout
my $timeout = $loop->timeout; $loop = $loop->timeout(5);
Maximum time in seconds our loop waits for new events to happen, defaults to 0.25.
0.25
unlock_cb
my $cb = $loop->unlock_cb; $loop = $loop->unlock_cb(sub {...});
A callback to free the listen lock, called after accepting a new connection and used to sync multiple server processes.
Mojo::IOLoop inherits all methods from Mojo::Base and implements the following new ones.
new
my $loop = Mojo::IOLoop->new;
Construct a new Mojo::IOLoop object. Multiple of these will block each other, so use singleton instead if possible.
singleton
connect
my $id = $loop->connect( address => '127.0.0.1', port => 3000, cb => sub {...} ); my $id = $loop->connect({ address => '127.0.0.1', port => 3000, cb => sub {...} }); my $id = $loop->connect({ address => '[::1]', port => 443, tls => 1, cb => sub {...} });
Open a TCP connection to a remote host, IPv6 will be used automatically if available. Note that IPv6 support depends on IO::Socket::INET6 and TLS support on IO::Socket::SSL.
These options are currently available.
address
Address or host name of the peer to connect to.
cb
Callback to be invoked once the connection is established.
port
Port to connect to.
tls
Enable TLS.
tls_ca_file
CA file to use for TLS.
tls_verify_cb
Callback to invoke for TLS verification.
connection_timeout
my $timeout = $loop->connection_timeout($id); $loop = $loop->connection_timeout($id => 45);
Maximum amount of time in seconds a connection can be inactive before being dropped.
drop
$loop = $loop->drop($id);
Drop a connection, listen socket or timer. Connections will be dropped gracefully by allowing them to finish writing all data in it's write buffer.
error_cb
$loop = $loop->error_cb($id => sub {...});
Callback to be invoked if an error event happens on the connection.
generate_port
my $port = $loop->generate_port;
Find a free TCP port, this is a utility function primarily used for tests.
hup_cb
$loop = $loop->hup_cb($id => sub {...});
Callback to be invoked if the connection gets closed.
is_running
my $running = $loop->is_running;
Check if loop is running.
exit unless Mojo::IOLoop->singleton->is_running;
listen
my $id = $loop->listen(port => 3000); my $id = $loop->listen({port => 3000}); my $id = $loop->listen(file => '/foo/myapp.sock'); my $id = $loop->listen( port => 443, tls => 1, tls_cert => '/foo/server.cert', tls_key => '/foo/server.key' );
Create a new listen socket, IPv6 will be used automatically if available. Note that IPv6 support depends on IO::Socket::INET6 and TLS support on IO::Socket::SSL.
Local address to listen on, defaults to all.
Callback to invoke for each accepted connection.
file
A unix domain socket to listen on.
Port to listen on.
queue_size
Maximum queue size, defaults to SOMAXCONN.
SOMAXCONN
tls_cert
Path to the TLS cert file.
tls_key
Path to the TLS key file.
local_info
my $info = $loop->local_info($id);
Get local information about a connection.
my $address = $info->{address};
These values are to be expected in the returned hash reference.
The local address.
The local port.
not_writing
$loop->not_writing($id);
Activate read only mode for a connection. Note that connections have no mode after they are created.
one_tick
$loop->one_tick;
Run reactor for exactly one tick.
read_cb
$loop = $loop->read_cb($id => sub {...});
Callback to be invoked if new data arrives on the connection.
$loop->read_cb($id => sub { my ($loop, $id, $chunk) = @_; # Process chunk });
remote_info
my $info = $loop->remote_info($id);
Get remote information about a connection.
The remote address.
The remote port.
my $loop = Mojo::IOLoop->singleton;
The global loop object, used to access a single shared loop instance from everywhere inside the process.
start
$loop->start;
Start the loop, this will block until the loop is finished or return immediately if the loop is already running.
start_tls
my $id = $loop->start_tls($id); my $id = $loop->start_tls($id => {tls_ca_file => '/etc/tls/cacerts.pem'});
Start new TLS connection inside old connection. Note that TLS support depends on IO::Socket::SSL.
stop
$loop->stop;
Stop the loop immediately, this will not interrupt any existing connections and the loop can be restarted by running start again.
timer
my $id = $loop->timer(5 => sub {...});
Create a new timer, invoking the callback afer a given amount of seconds.
write_cb
$loop = $loop->write_cb($id => sub {...});
Callback to be invoked if new data can be written to the connection. The callback should return a chunk of data which will be buffered inside the loop to guarantee safe writing.
$loop->write_cb($id => sub { my ($loop, $id) = @_; return 'Data to be buffered by the loop!'; });
writing
$loop->writing($id);
Activate read/write mode for a connection. Note that connections have no mode after they are created.
Mojolicious, Mojolicious::Guides, http://mojolicious.org.
To install Mojolicious, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Mojolicious
CPAN shell
perl -MCPAN -e shell install Mojolicious
For more information on module installation, please visit the detailed CPAN module installation guide.