1IO::Async::Protocol::StUrseearm(C3o)ntributed Perl DocumIeOn:t:aAtsiyonnc::Protocol::Stream(3)
2
3
4

NAME

6       "IO::Async::Protocol::Stream" - base class for stream-based protocols
7

SYNOPSIS

9       Most likely this class will be subclassed to implement a particular
10       network protocol.
11
12          package Net::Async::HelloWorld;
13
14          use strict;
15          use warnings;
16          use base qw( IO::Async::Protocol::Stream );
17
18          sub on_read
19          {
20             my $self = shift;
21             my ( $buffref, $eof ) = @_;
22
23             return 0 unless $$buffref =~ s/^(.*)\n//;
24             my $line = $1;
25
26             if( $line =~ m/^HELLO (.*)/ ) {
27                my $name = $1;
28
29                $self->invoke_event( on_hello => $name );
30             }
31
32             return 1;
33          }
34
35          sub send_hello
36          {
37             my $self = shift;
38             my ( $name ) = @_;
39
40             $self->write( "HELLO $name\n" );
41          }
42
43       This small example elides such details as error handling, which a real
44       protocol implementation would be likely to contain.
45

DESCRIPTION

47       This subclass of IO::Async::Protocol is intended to stand as a base
48       class for implementing stream-based protocols. It provides an interface
49       similar to IO::Async::Stream, primarily, a "write" method and an
50       "on_read" event handler.
51
52       It contains an instance of an IO::Async::Stream object which it uses
53       for actual communication, rather than being a subclass of it, allowing
54       a level of independence from the actual stream being used. For example,
55       the stream may actually be an IO::Async::SSLStream to allow the
56       protocol to be used over SSL.
57
58       As with IO::Async::Stream, it is required that by the time the protocol
59       object is added to a Loop, that it either has an "on_read" method, or
60       has been configured with an "on_read" callback handler.
61

EVENTS

63       The following events are invoked, either using subclass methods or CODE
64       references in parameters:
65
66   $ret = on_read \$buffer, $eof
67   on_read_eof
68   on_write_eof
69       The event handlers are invoked identically to IO::Async::Stream.
70
71   on_closed
72       The "on_closed" handler is optional, but if provided, will be invoked
73       after the stream is closed by either side (either because the "close()"
74       method has been invoked on it, or on an incoming EOF).
75

PARAMETERS

77       The following named parameters may be passed to "new" or "configure":
78
79   on_read => CODE
80   on_read_eof => CODE
81   on_write_eof => CODE
82       CODE references for the events.
83
84   handle => IO
85       A shortcut for the common case where the transport only needs to be a
86       plain IO::Async::Stream object. If this argument is provided without a
87       "transport" object, a new IO::Async::Stream object will be built around
88       the given IO handle, and used as the transport.
89

METHODS

91   write
92          $protocol->write( $data )
93
94       Writes the given data by calling the "write" method on the contained
95       transport stream.
96
97   connect
98          $protocol->connect( %args )
99
100       Sets up a connection to a peer, and configures the underlying
101       "transport" for the Protocol. Calls IO::Async::Protocol "connect" with
102       "socktype" set to "stream".
103

AUTHOR

105       Paul Evans <leonerd@leonerd.org.uk>
106
107
108
109perl v5.34.0                      2022-01-21    IO::Async::Protocol::Stream(3)