Net::HTTPS::NB(3) Non-blocking HTTPS client

SYNOPSIS

Example of sending request and receiving response


use strict;
use Net::HTTPS::NB;
use IO::Select;
use Errno qw/EAGAIN EWOULDBLOCK/;

my $s = Net::HTTPS::NB->new(Host => "pause.perl.org") || die [email protected];
$s->write_request(GET => "/");

my $sel = IO::Select->new($s);

READ_HEADER: {
die "Header timeout" unless $sel->can_read(10);
my($code, $mess, %h) = $s->read_response_headers;
redo READ_HEADER unless $code;
}

# Net::HTTPS::NB uses internal buffer for reading
# so we should check it before socket check by calling read_entity_body()
# it is error to wait data on socket before read_entity_body() will return undef
# with $! set to EAGAIN or EWOULDBLOCK
# make socket non-blocking, so read_entity_body() will not block
$s->blocking(0);

while (1) {
my $buf;
my $n;
# try to read until error or all data received
while (1) {
my $tmp_buf;
$n = $s->read_entity_body($tmp_buf, 1024);
if ($n == -1 || (!defined($n) && ($! == EWOULDBLOCK || $! == EAGAIN))) {
last; # no data available this time
}
elsif ($n) {
$buf .= $tmp_buf; # data received
}
elsif (defined $n) {
last; # $n == 0, all readed
}
else {
die "Read error occured: ", $!; # $n == undef
}
}

print $buf if length $buf;
last if defined $n && $n == 0; # all readed
die "Body timeout" unless $sel->can_read(10); # wait for new data
}

Example of non-blocking connect
        use strict;
        use Net::HTTPS::NB;
        use IO::Select;
        my $sock = Net::HTTPS::NB->new(Host => 'encrypted.google.com', Blocking => 0);
        my $sele = IO::Select->new($sock);
        until ($sock->connected) {
                if ($HTTPS_ERROR == HTTPS_WANT_READ) {
                        $sele->can_read();
                }
                elsif($HTTPS_ERROR == HTTPS_WANT_WRITE) {
                        $sele->can_write();
                }
                else {
                        die 'Unknown error: ', $HTTPS_ERROR;
                }
        }

See `examples' subdirectory for more examples.

DESCRIPTION

Same interface as Net::HTTPS but it will never try multiple reads when the read_response_headers() or read_entity_body() methods are invoked. In addition allows non-blocking connect.
If read_response_headers() did not see enough data to complete the headers an empty list is returned.
If read_entity_body() did not see new entity data in its read the value -1 is returned.

PACKAGE CONSTANTS

Imported by default

        HTTPS_WANT_READ
        HTTPS_WANT_WRITE

PACKAGE VARIABLES

Imported by default

        $HTTPS_ERROR

METHODS

new(%cfg)

Same as Net::HTTPS::new, but in addition allows `Blocking' parameter. By setting this parameter to 0 you can perform non-blocking connect. See connected() to determine when connection completed.

connected()

Returns true value when connection completed (https handshake done). Otherwise returns false. In this case you can check $HTTPS_ERROR to determine what handshake need for, read or write. $HTTPS_ERROR could be HTTPS_WANT_READ or HTTPS_WANT_WRITE respectively. See ``SYNOPSIS''.

blocking($flag)

As opposed to Net::HTTPS where blocking method consciously broken you can set socket blocking. For example you can return socket to blocking state after non-blocking connect.

COPYRIGHT

Copyright 2011-2015 Oleg G <[email protected]>.

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.