Mojo::IOLoop - Minimalistic Reactor For Async TCP Clients And Servers
use Mojo::IOLoop; # Create loop my $loop = Mojo::IOLoop->new; # Listen on port 3000 $loop->listen( port => 3000, on_read => sub { my ($self, $id, $chunk) = @_; # Process input print $chunk; # Got some data, time to write $self->write($id, 'HTTP/1.1 200 OK'); } ); # Connect to port 3000 with TLS activated my $id = $loop->connect( address => 'localhost', port => 3000, tls => 1, on_connect => sub { my ($self, $id) = @_; # Write request $self->write($id, "GET / HTTP/1.1\r\n\r\n"); }, on_read => sub { my ($self, $id, $chunk) = @_; # Process input print $chunk; } ); # 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 async TCP clients and servers.
Optional modules IO::KQueue, IO::Epoll, IO::Socket::IP and IO::Socket::SSL are supported transparently and used if installed.
A TLS certificate and key are also built right in to make writing test servers as easy as possible.
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 3.
3
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 3.
dns_server
my $server = $loop->dns_server; $loop = $loop->dns_server('8.8.8.8');
DNS server to use for non-blocking lookups, defaults to the value of MOJO_DNS_SERVER, auto detection or 8.8.8.8. Note that this attribute is EXPERIMENTAL and might change without warning!
DNS
MOJO_DNS_SERVER
8.8.8.8
dns_timeout
my $timeout = $loop->dns_timeout; $loop = $loop->dns_timeout(5);
Maximum time in seconds a DNS lookup can take, defaults to 3. Note that this attribute is EXPERIMENTAL and might change without warning!
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
on_idle
my $cb = $loop->on_idle; $loop = $loop->on_idle(sub {...});
Callback to be invoked on every reactor tick if no events occurred. Note that this attribute is EXPERIMENTAL and might change without warning!
on_lock
my $cb = $loop->on_lock; $loop = $loop->on_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.
$loop->on_lock(sub { my ($loop, $blocking) = @_; # Got the lock, listen for new connections return 1; });
on_tick
my $cb = $loop->on_tick; $loop = $loop->on_tick(sub {...});
Callback to be invoked on every reactor tick, this for example allows you to run multiple reactors next to each other.
my $loop2 = Mojo::IOLoop->new(timeout => 0); Mojo::IOLoop->singleton->on_tick(sub { $loop2->one_tick });
Note that the loop timeout can be changed dynamically at any time to adjust responsiveness.
on_unlock
my $cb = $loop->on_unlock; $loop = $loop->on_unlock(sub {...});
A callback to free the accept lock, used to sync multiple server processes. Note that exceptions in this callback are not captured.
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. Note that a value of 0 would make the loop non-blocking.
0.25
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 ); my $id = $loop->connect({ address => '[::1]', port => 443, tls => 1 });
Open a TCP connection to a remote host, IPv6 will be used automatically if available. Note that IPv6 support depends on IO::Socket::IP and TLS support on IO::Socket::SSL.
These options are currently available.
address
Address or host name of the peer to connect to.
on_connect
Callback to be invoked once the connection is established.
on_error
Callback to be invoked if an error event happens on the connection.
on_hup
Callback to be invoked if the connection gets closed.
on_read
Callback to be invoked if new data arrives on the connection.
port
Port to connect to.
proto
Protocol to use, defaults to tcp.
tcp
socket
Use an already prepared socket handle.
tls
Enable TLS.
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.
generate_port
my $port = $loop->generate_port;
Find a free TCP port, this is a utility function primarily used for tests.
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::IP and TLS support on IO::Socket::SSL.
Local address to listen on, defaults to all.
file
A unix domain socket to listen on.
on_accept
Callback to invoke for each accepted connection.
Port to listen on.
queue_size
Maximum queue size, defaults to SOMAXCONN.
SOMAXCONN
tls_cert
Path to the TLS cert file, defaulting to a built in test certificate.
tls_key
Path to the TLS key file, defaulting to a built in test key.
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.
lookup
$loop = $loop->lookup('mojolicio.us' => sub {...});
Lookup IPv4 or IPv6 address for domain. Note that this method is EXPERIMENTAL and might change without warning!
IPv4
IPv6
$loop->lookup('mojolicio.us' => sub { my ($loop, $address) = @_; print "Address: $address\n"; });
$loop = $loop->on_error($id => sub {...});
$loop = $loop->on_hup($id => sub {...});
$loop = $loop->on_read($id => sub {...});
$loop->on_read($id => sub { my ($loop, $id, $chunk) = @_; # Process chunk });
one_tick
$loop->one_tick; $loop->one_tick('0.25'); $loop->one_tick(0);
Run reactor for exactly one tick.
remote_info
my $info = $loop->remote_info($id);
Get remote information about a connection.
The remote address.
The remote port.
resolve
$loop = $loop->resolve('mojolicio.us', 'A', sub {...});
Resolve domain into A, AAAA or TXT records. Note that this method is EXPERIMENTAL and might change without warning!
A
AAAA
TXT
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 stop is called or return immediately if the loop is already running.
stop
start_tls
my $id = $loop->start_tls($id);
Start new TLS connection inside old connection. Note that TLS support depends on IO::Socket::SSL.
$loop->stop;
Stop the loop immediately, this will not interrupt any existing connections and the loop can be restarted by running start again.
test
my $success = $loop->test($id);
Test for errors and garbage bytes on the connection. Note that this method is EXPERIMENTAL and might change without warning!
timer
my $id = $loop->timer(5 => sub {...}); my $id = $loop->timer(0.25 => sub {...});
Create a new timer, invoking the callback afer a given amount of seconds.
write
$loop->write($id => 'Hello!'); $loop->write($id => 'Hello!', sub {...});
Write data to connection, the optional drain callback will be invoked once all data has been written.
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.