class IO::Socket::INET
Error ReportCollection examples

TCP Socket

class IO::Socket::INET does IO::Socket {}

IO::Socket::INET provides TCP sockets, both the server and the client side.

For UDP support, please see IO::Socket::Async.

Here is an example of a very simplistic "echo" server that listens on localhost, port 3333:

my $listen = IO::Socket::INET.new:listen,
                                   :localport(3333) );
loop {
    my $conn = $listen.accept;
    try {
        while my $buf = $conn.recv(:bin{
            $conn.write: $buf;
    CATCH {
          default { .payload.say;      }

And a client that connects to it, and prints out what the server answers:

my $conn = IO::Socket::INET.new:host<localhost>,
                                 :port(3333) );
$conn.print: 'Hello, Raku';
say $conn.recv;

Please bear in mind that this is a synchronous connection; an attempt by any of the nodes to write without the other reading will produce an Could not receive data from socket: Connection reset by peer error.


method new

multi method new(
        :$family = PF_INET,
        :$encoding = 'utf-8',
        :$nl-in = "\r\n",
    --> IO::Socket::INET:D)
multi method new(
        :$family = PF_INET,
        :$encoding = 'utf-8',
        :$nl-in = "\r\n",
    --> IO::Socket::INET:D)

Creates a new socket.

If :$listen is True, creates a new socket that listen on :$localhost (which can be an IP address or a domain name) on port :$localport; in other words the :$listen flag determines the server mode of the socket. Otherwise (i.e., :$listen is False), the new socket opens immediately a connection to :$host on port :$port.

:$family defaults to PF_INET constant for IPv4, and can be set to PF_INET6 constant for IPv6.

For text operations (such as #method lines and #method get), :$encoding specifies the encoding, and :$nl-in determines the character(s) that separate lines.


method get

method get()

Reads a line from the socket and returns it as of type Str. Return Nil on end-of-file (EOF).

method lines

method lines()

Returns a lazy list of lines read from the socket.

method accept

method accept()

In listen/server mode, waits for a new incoming connection. Once a new connection is established, an IO::Socket::INET instance (or a subclass instance) for consuming the connection is returned.