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#+##############################################################################
# #
# File: Messaging/Message/Generator.pm #
# #
# Description: versatile message generator #
# #
#-##############################################################################
#
# module definition
#
package Messaging::Message::Generator;
use strict;
use warnings;
use 5.005; # need the four-argument form of substr()
our $VERSION = "1.7";
our $REVISION = sprintf("%d.%02d", q$Revision: 1.13 $ =~ /(\d+)\.(\d+)/);
#
# used modules
#
use Digest::MD5 qw();
use Encode qw(decode FB_CROAK);
use Messaging::Message qw();
use MIME::Base64 qw(decode_base64 encode_base64);
use No::Worries::Die qw(dief);
use Params::Validate qw(validate :types);
#
# global variables
#
our(
$_MD5, # the MD5 digester object
$_UnicodeString, # string with Unicode characters
);
#
# initialize what is needed for this module to work
#
sub _init () {
$_MD5 = Digest::MD5->new();
$_MD5->add($$ . "-" . time());
# http://www.cl.cam.ac.uk/~mgk25/ucs/examples/UTF-8-demo.txt
$_UnicodeString = decode_base64(<<'EOT');
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ICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAg
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ICAgICAgICAgICDilp3iloDilpjilpniloTilp8K
EOT
dief("corrupted inlined UTF-8 string: %d", length($_UnicodeString))
unless length($_UnicodeString) == 14052;
$_UnicodeString = decode("UTF-8", $_UnicodeString, FB_CROAK);
dief("corrupted inlined Unicode string: %d", length($_UnicodeString))
unless length($_UnicodeString) == 7621;
}
#
# return a reference to a random binary string of the given length
#
sub _rndbin ($) {
my($length) = @_;
my($string, $digest, $extra);
return(\ "") unless $length > 0;
$_MD5->add(rand());
$string = "";
while (length($string) < $length) {
$digest = $_MD5->digest();
$_MD5->add($digest);
$string .= $digest;
}
$extra = length($string) - $length;
substr($string, $length, $extra, "") if $extra > 0;
return(\$string);
}
#
# return a reference to a random Unicode string of the given length
#
sub _rnduni ($) {
my($length) = @_;
my($string, $digest, $extra);
return(\ "") unless $length > 0;
$_MD5->add(rand());
$string = "";
while (length($string) < $length) {
$digest = $_MD5->digest();
$_MD5->add($digest);
foreach my $n (unpack("n8", $digest)) {
$string .= substr($_UnicodeString,
int(($n >> 6) * 7.3), ($n & 63) + 1);
}
}
$extra = length($string) - $length;
substr($string, $length, $extra, "") if $extra > 0;
return(\$string);
}
#
# return a random integer according to the given specification
#
sub _rndint ($) {
my($spec) = @_;
my($rnd);
if ($spec =~ /^(\d+)$/) {
return($1);
} elsif ($spec =~ /^(\d+)-(\d+)$/) {
return($1 + int(rand($2 - $1 + 1)));
} elsif ($spec =~ /^(\d+)\^(\d+)$/) {
# see Irwin-Hall in http://en.wikipedia.org/wiki/Normal_distribution
$rnd = rand(1) + rand(1) + rand(1) + rand(1) + rand(1) + rand(1) +
rand(1) + rand(1) + rand(1) + rand(1) + rand(1) + rand(1);
return($1 + int($rnd * ($2 - $1 + 1) / 12));
}
dief("unsupported random integer specification: %s", $spec);
}
#
# return a reference to a random string according to the given entropy
#
sub _rndstr ($$$) {
my($text, $length, $entropy) = @_;
my($string, $extra, $tmp);
return(\ "") unless $length > 0;
if ($entropy == 0) {
$tmp = chr(65 + int(rand(26)));
$string = $tmp x $length;
} elsif ($entropy == 1) {
$string = unpack("h*", ${ _rndbin(int($length / 2 + 0.5)) });
$extra = length($string) - $length;
substr($string, $length, $extra, "") if $extra > 0;
} elsif ($entropy == 2) {
$string = encode_base64(${ _rndbin(int($length * 0.75 + 1)) }, "");
$string =~ tr{/+}{-_};
$extra = length($string) - $length;
substr($string, $length, $extra, "") if $extra > 0;
} elsif ($entropy == 3) {
$string = pack("c*", map(32 + int(rand(95)), 1 .. $length));
} else {
# directly return the reference!
return($text ? _rnduni($length) : _rndbin($length));
}
return(\$string);
}
#
# constructor
#
my $optional_scalar = { optional => 1, type => SCALAR };
my $optional_rndint = { %{ $optional_scalar }, regex => qr/^(\d+[\-\^])?\d+$/ };
my %new_options = (
"text" => $optional_rndint,
"body-length" => $optional_rndint,
"body-entropy" => $optional_rndint,
"header-count" => $optional_rndint,
"header-name-prefix" => $optional_scalar,
"header-name-length" => $optional_rndint,
"header-name-entropy" => $optional_rndint,
"header-value-prefix" => $optional_scalar,
"header-value-length" => $optional_rndint,
"header-value-entropy" => $optional_rndint,
);
sub new : method {
my($class, %option, $self);
$class = shift(@_);
%option = validate(@_, \%new_options) if @_;
$option{"header-name-prefix"} = ""
unless defined($option{"header-name-prefix"});
$option{"header-value-prefix"} = ""
unless defined($option{"header-value-prefix"});
$self = \%option;
_init() unless $_MD5;
bless($self, $class);
return($self);
}
#
# message generation
#
sub message : method {
my($self) = @_;
my(%option, $tmp, $name, $value);
# generate text
$tmp = _rndint($self->{"text"} || 0);
$option{text} = $tmp ? 1 : 0;
# generate body
$option{body_ref} = _rndstr($option{text},
_rndint($self->{"body-length"} || 0),
_rndint($self->{"body-entropy"} || 0));
# generate header
$tmp = _rndint($self->{"header-count"} || 0);
if ($tmp) {
$option{header} = {};
while ($tmp-- > 0) {
# generate header name
$name = _rndstr(1,
_rndint($self->{"header-name-length"} || 0),
_rndint($self->{"header-name-entropy"} || 0));
$name = $self->{"header-name-prefix"} . ${ $name };
# generate header value
$value = _rndstr(1,
_rndint($self->{"header-value-length"} || 0),
_rndint($self->{"header-value-entropy"} || 0));
$value = $self->{"header-value-prefix"} . ${ $value };
# store it
$option{header}{$name} = $value;
}
}
return(Messaging::Message->new(%option));
}
1;
__DATA__
=head1 NAME
Messaging::Message::Generator - versatile message generator
=head1 SYNOPSIS
use Messaging::Message::Generator;
# create the generator
$mg = Messaging::Message::Generator->new(
"text" => "0-1",
"body-length" => "0-1000",
"body-entropy" => "1-4",
"header-count" => "2^6",
"header-name-length" => "10-20",
"header-name-entropy" => "1-2",
"header-name-prefix" => "rnd-",
"header-value-length" => "20-40",
"header-value-entropy" => "0-3",
);
# use it to generate 10 messages
foreach (1 .. 10) {
$msg = $mg->message();
... do something with it ...
}
=head1 DESCRIPTION
This module provides a versatile message generator that can be useful
for stress testing or benchmarking messaging brokers or libraries.
=head1 METHODS
The following methods are available:
=over
=item new([OPTIONS])
return a new Messaging::Message::Generator object (class method)
=item message()
return a newly generated Messaging::Message object
=back
=head1 OPTIONS
When creating a message generator, the following options can be given:
=over
=item text
integer specifying if the body is text string (as opposed to binary
string) or not; supported values are C<0> (never text), C<1> (always
text) or C<0-1> (randomly text or not)
=item body-length
integer specifying the length of the body
=item body-entropy
integer specifying the entropy of the body
=item header-count
integer specifying the number of header fields
=item header-name-prefix
string to prepend to each header field name
=item header-name-length
integer specifying the length of each header field name (prefix not
included)
=item header-name-entropy
integer specifying the entropy of each header field name
=item header-value-prefix
string to prepend to each header field value
=item header-value-length
integer specifying the length of each header field value (prefix not
included)
=item header-value-entropy
integer specifying the entropy of each header field value
=back
All the options default to C<0> or the empty string.
All the I<integer> options can be given either:
=over
=item * a positive integer C<X>, meaning exactly this value
=item * a C<X-Y> range, meaning a discrete uniform distribution
between the two given integers, bounds included
=item * a C<X^Y> range, meaning a pseudo normal distribution between
the two given integers, bounds included
=back
All the I<entropy> options interpret their integer value this way:
=over
=item * C<0> means a single character, repeated
=item * C<1> means hexadecimal characters
=item * C<2> means Base64 characters (with C<-> instead of C</> and C<_> instead od C<+>)
=item * C<3> means printable 7-bit ASCII characters
=item * C<4> means random characters (including Unicode, except for binary bodies)
=back
=head1 SEE ALSO
L<Messaging::Message>.
=head1 AUTHOR
Lionel Cons L<http://cern.ch/lionel.cons>
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