NAME
Mojo::IOLoop - Minimalistic Reactor For Async TCP Clients And Servers
SYNOPSIS
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;DESCRIPTION
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.
ATTRIBUTES
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.
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');IP address of 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_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_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 infinitely. 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 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.
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_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 0.025. Note that a value of 0 would make the loop non-blocking.
METHODS
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.
connect
my $id = $loop->connect(
address => '127.0.0.1',
port => 3000
);Open a TCP connection to a remote host. Note that TLS support depends on IO::Socket::SSL and IPv6 support on IO::Socket::IP.
These options are currently available.
address-
Address or host name of the peer to connect to.
handle-
Use an already prepared handle.
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. tls-
Enable TLS.
tls_cert-
Path to the TLS certificate file.
tls_key-
Path to the TLS key file.
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 anything with an id. Connections will be dropped gracefully by allowing them to finish writing all data in its write buffer.
generate_port
my $port = $loop->generate_port;Find a free TCP port, this is a utility function primarily used for tests.
handle
my $handle = $loop->handle($id);Get handle for id. Note that this method is EXPERIMENTAL and might change without warning!
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. Note that TLS support depends on IO::Socket::SSL and IPv6 support on IO::Socket::IP.
These options are currently available.
address-
Local address to listen on, defaults to all.
backlog-
Maximum backlog size, defaults to
SOMAXCONN. file-
A unix domain socket to listen on.
on_accept-
Callback to invoke for each accepted connection.
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 listen on.
tls-
Enable TLS.
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.
tls_ca-
Path to TLS certificate authority file or directory.
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.
address-
The local address.
port-
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!
$loop->lookup('mojolicio.us' => sub {
my ($loop, $address) = @_;
print "Address: $address\n";
});on_error
$loop = $loop->on_error($id => sub {...});Callback to be invoked if an error event happens on the connection.
on_hup
$loop = $loop->on_hup($id => sub {...});Callback to be invoked if the connection gets closed.
on_idle
my $id = $loop->on_idle(sub {...});Callback to be invoked on every reactor tick if no other events occurred. Note that this method is EXPERIMENTAL and might change without warning!
on_read
$loop = $loop->on_read($id => sub {...});Callback to be invoked if new data arrives on the connection.
$loop->on_read($id => sub {
my ($loop, $id, $chunk) = @_;
# Process chunk
});on_tick
my $id = $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.
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.
my $address = $info->{address};These values are to be expected in the returned hash reference.
address-
The remote address.
port-
The remote port.
resolve
$loop = $loop->resolve('mojolicio.us', 'A', sub {...});Resolve domain into A, AAAA, CNAME, MX, NS, PTR or TXT records, * will query for all at once. Note that this method is EXPERIMENTAL and might change without warning!
singleton
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.
start_tls
my $id = $loop->start_tls($id);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.
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.