net::daemon::test(3)
NAME
Net::Daemon::Test - support functions for testing
Net::Daemon servers
SYNOPSIS
# This is the server, stored in the file "servertask".
#
# Create a subclass of Net::Daemon::Test, which in
turn is
# a subclass of Net::Daemon
use Net::Daemon::Test ();
package MyDaemon;
@MyDaemon::ISA = qw(Net::Daemon::Test);
sub Run {
# Overwrite this and other methods, as you like.
}
my $self = Net::Daemon->new(attr, @options);
eval { $self->Bind() };
if ($@) {
die "Server cannot bind: $!";
}
eval { $self->Run() };
if ($@) {
die "Unexpected server termination: $@";
}
# This is the client, the real test script, note we
call the
# "servertask" file below:
#
# Call the Child method to spawn a child. Don't forget
to use
# the timeout option.
use Net::Daemon::Test ();
my($handle, $port) = eval {
Net::Daemon::Test->Child(5, # Number of subtests
'servertask', '--timeout', '20')
};
if ($@) {
print "not ok 1 $@0;
exit 0;
}
print "ok 10;
# Real tests following here
...
# Terminate the server
$handle->Terminate();
DESCRIPTION
This module is a frame for creating test scripts of
Net::Daemon based server packages, preferrably using
Test::Harness, but that's your choice.
A test consists of two parts: The client part and the
server part. The test is executed by the child part which
invokes the server part, by spawning a child process and
invoking an external Perl script. (Of course we woultn't
need this external file with fork(), but that's the best
possibility to make the test scripts portable to Windows
without requiring threads in the test script.)
The server part is a usual Net::Daemon application, for
example a script like dbiproxy. The only difference is
that it derives from Net::Daemon::Test and not from
Net::Daemon, the main difference is that the Bind method
attempts to allocate a port automatically. Once a port is
allocated, the number is stored in the file "ndtest.prt".
After spawning the server process, the child will wait ten
seconds (hopefully sufficient) for the creation of
ndtest.prt.
AVAILABLE METHODS
Server part
- Options Adds an option --timeout to Net::Daemon: The
- server's Run method will die after at most 20 sec
onds. - Bind (Instance method) This is mainly the default Bind
- method, but it attempts to find and allocate a
free port in two ways: First of all, it tries to
call Bind with port 0, most systems will automati
cally choose a port in that case. If that seems to
fail, ports 30000-30049 are tried. We hope, one of
these will succeed. :-) - Run (Instance method) Overwrites the Net::Daemon's
- method by adding a timeout.
- sub Run ($) {
- my $self = shift;
$self->Run(); } - Client part
- Child (Class method) Attempts to spawn a server process.
- The server process is expected to create the file
'ndtest.prt' with the port number. - The method returns a process handle and a port
number. The process handle offers a method Termi
nate that may later be used to stop the server
process.
AUTHOR AND COPYRIGHT
- Net::Daemon is Copyright (C) 1998, Jochen Wiedmann
- Am Eisteich 9
72555 Metzingen
Germany - Phone: +49 7123 14887
Email: joe@ispsoft.de - All rights reserved.
- You may distribute under the terms of either the GNU Gen
eral Public License or the Artistic License, as specified
in the Perl README file.