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12
Build.PL
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# =========================================================================
# THIS FILE IS AUTOMATICALLY GENERATED BY MINILLA.
# DO NOT EDIT DIRECTLY.
# =========================================================================
use 5.008_001;
use strict;
use Module::Build::Tiny 0.035;
Build_PL();

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Revision history for Perl extension Log-GELF-Util
0.96 2016-03-01T12:49:34Z
- added ability to specify message id when chunking
0.95 2016-02-26T00:26:50Z
- improve documentaion
- make use of GELF message magic constant in enchunk()
0.94 2016-02-25T12:16:02Z
- facility was incorrectly limited to numbers
0.93 2016-02-25T06:04:28Z
- documentation cleanups
0.92 2016-02-24T23:22:01Z
- fixed bug introduced with Readonly.pm v2.01
0.91 2016-02-24T22:47:40Z
- dechunk() now handles chunks being passed in random order
0.90 2016-02-24T04:55:07Z
- original version

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LICENSE
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This software is copyright (c) 2016 by Adam Clarke <adam.clarke@strategicdata.com.au>.
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.
Terms of the Perl programming language system itself
a) the GNU General Public License as published by the Free
Software Foundation; either version 1, or (at your option) any
later version, or
b) the "Artistic License"
--- The GNU General Public License, Version 1, February 1989 ---
This software is Copyright (c) 2016 by Adam Clarke <adam.clarke@strategicdata.com.au>.
This is free software, licensed under:
The GNU General Public License, Version 1, February 1989
GNU GENERAL PUBLIC LICENSE
Version 1, February 1989
Copyright (C) 1989 Free Software Foundation, Inc.
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--- The Artistic License 1.0 ---
This software is Copyright (c) 2016 by Adam Clarke <adam.clarke@strategicdata.com.au>.
This is free software, licensed under:
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The End

16
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Build.PL
Changes
LICENSE
META.json
README.md
cpanfile
lib/Log/GELF/Util.pm
minil.toml
t/00_compile.t
t/01_utilities.t
t/02_validate.t
t/03_encode.t
t/04_compress.t
t/05_chunked.t
META.yml
MANIFEST

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META.json
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{
"abstract" : "Utility functions for Graylog's GELF format.",
"author" : [
"Adam Clarke <adamc@strategicdata.com.au>"
],
"dynamic_config" : 0,
"generated_by" : "Minilla/v3.0.1",
"license" : [
"perl_5"
],
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"version" : "2"
},
"name" : "Log-GELF-Util",
"no_index" : {
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"t",
"xt",
"inc",
"share",
"eg",
"examples",
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"builder"
]
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"configure" : {
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}
},
"runtime" : {
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"JSON::MaybeXS" : "0",
"Math::Random::MT" : "0",
"Params::Validate" : "0",
"Readonly" : "2.00",
"Sys::Hostname" : "0",
"Time::HiRes" : "0",
"perl" : "5.010"
}
},
"test" : {
"requires" : {
"Test::Exception" : "0",
"Test::More" : "0.98",
"Test::Warnings" : "0.005"
}
}
},
"provides" : {
"Log::GELF::Util" : {
"file" : "lib/Log/GELF/Util.pm",
"version" : "0.96"
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"release_status" : "stable",
"resources" : {
"bugtracker" : {
"web" : "https://github.com/strategicdata/log-gelf-util/issues"
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"homepage" : "https://github.com/strategicdata/log-gelf-util",
"repository" : {
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"web" : "https://github.com/strategicdata/log-gelf-util"
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"x_contributors" : [
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"Adam Clarke <adam@clarke.id.au>"
],
"x_serialization_backend" : "JSON::PP version 2.27300"
}

48
META.yml
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@ -1,48 +0,0 @@
---
abstract: "Utility functions for Graylog's GELF format."
author:
- 'Adam Clarke <adamc@strategicdata.com.au>'
build_requires:
Test::Exception: '0'
Test::More: '0.98'
Test::Warnings: '0.005'
configure_requires:
Module::Build::Tiny: '0.035'
dynamic_config: 0
generated_by: 'Minilla/v3.0.1, CPAN::Meta::Converter version 2.150005'
license: perl
meta-spec:
url: http://module-build.sourceforge.net/META-spec-v1.4.html
version: '1.4'
name: Log-GELF-Util
no_index:
directory:
- t
- xt
- inc
- share
- eg
- examples
- author
- builder
provides:
Log::GELF::Util:
file: lib/Log/GELF/Util.pm
version: '0.96'
requires:
JSON::MaybeXS: '0'
Math::Random::MT: '0'
Params::Validate: '0'
Readonly: '2.00'
Sys::Hostname: '0'
Time::HiRes: '0'
perl: '5.010'
resources:
bugtracker: https://github.com/strategicdata/log-gelf-util/issues
homepage: https://github.com/strategicdata/log-gelf-util
repository: git://github.com/strategicdata/log-gelf-util.git
version: '0.96'
x_contributors:
- 'Adam Clarke <adam.clarke@strategicdata.com.au>'
- 'Adam Clarke <adam@clarke.id.au>'
x_serialization_backend: 'CPAN::Meta::YAML version 0.012'

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README.md
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[![Build Status](https://travis-ci.org/strategicdata/log-gelf-util.svg?branch=master)](https://travis-ci.org/strategicdata/log-gelf-util)
# NAME
Log::GELF::Util - Utility functions for Graylog's GELF format.
# SYNOPSIS
use Log::GELF::Util qw( encode );
my $msg = encode( { short_message => 'message', } );
use Log::GELF::Util qw( :all );
sub process_chunks {
my @accumulator;
my $msg;
do {
$msg = dechunk(
\@accumulator,
decode_chunk(shift())
);
} until ($msg);
return uncompress($msg);
};
my $hr = validate_message( short_message => 'message' );
# DESCRIPTION
Log::GELF::Util is a collection of functions and data structures useful
when working with Graylog's GELF Format version 1.1. It strives to support
all of the features and options as described in the [GELF
specification](http://docs.graylog.org/en/latest/pages/gelf.html).
# FUNCTIONS
## validate\_message( short\_message => $ )
Returns a HASHREF representing the validated message with any defaulted
values added to the data structure.
Takes the following message parameters as per the GELF message
specification:
- short\_message
Mandatory string, a short descriptive message
- version
String, must be '1.1' which is the default.
- host
String, defaults to hostname() from [Sys::Hostname](https://metacpan.org/pod/Sys::Hostname).
- timestamp
Timestamp, defaults to time() from [Time::HiRes](https://metacpan.org/pod/Time::HiRes).
- level
Integer, equal to the standard syslog levels, default is 1 (ALERT).
- facility
Deprecated, a warning will be issued.
- line
Deprecated, a warning will be issued.
- file
Deprecated, a warning will be issued.
- \_\[additional\_field\]
Parameters prefixed with an underscore (\_) will be treated as an additional
field. Allowed characters in field names are any word character (letter,
number, underscore), dashes and dots. As per the specification '\_id' is
disallowed.
## encode( \\% )
Accepts a HASHREF representing a GELF message. The message will be
validated with ["validate\_message"](#validate_message).
Returns a JSON encoded string representing the message.
## decode( $ )
Accepts a JSON encoded string representing the message. This will be
converted to a hashref and validated with ["validate\_message"](#validate_message).
Returns a HASHREF representing the validated message with any defaulted
values added to the data structure.
## compress( $ \[, $\] )
Accepts a string and compresses it. The second parameter is optional and
can take the value `zlib` or `gzip`, defaulting to `gzip`.
Returns a compressed string.
## uncompress( $ )
Accepts a string and uncompresses it. The compression method (`gzip` or
`zlib`) is determined automatically. Uncompressed strings are passed
through unaltered.
Returns an uncompressed string.
## enchunk( $ \[, $, $\] )
Accepts an encoded message (JSON string) and chunks it according to the
GELF chunking protocol.
The optional second parameter is the maximum size of the chunks to produce,
this must be a positive integer or the special strings `lan` or `wan`,
see ["parse\_size"](#parse_size). Defaults to `wan`. A zero chunk size means no chunking
will be applied.
The optional third parameter is the message id used to identify associated
chunks. This must be 8 bytes. It defaults to 8 bytes of randomness generated
by [Math::Random::MT](https://metacpan.org/pod/Math::Random::MT).
If the message size is greater than the maximum size then an array of
chunks is retuned, otherwise the message is retuned unaltered as the first
element of an array.
## dechunk( \\@, \\% )
This facilitates reassembling a GELF message from a stream of chunks.
It accepts an ARRAYREF for accumulating the chunks and a HASHREF
representing a decoded message chunk as produced by ["decode\_chunk"](#decode_chunk).
It returns undef if the accumulator is not complete, i.e. all chunks have
not yet been passed it.
Once the accumulator is complete it returns the de-chunked message in the
form of a string. Note that this message may still be compressed.
Here is an example usage:
sub process_chunks {
my @accumulator;
my $msg;
do {
$msg = dechunk(
\@accumulator,
decode_chunk(shift())
);
} until ($msg);
return uncompress($msg);
};
## is\_chunked( $ )
Accepts a string and returns a true value if it is a GELF message chunk.
## decode\_chunk( $ )
Accepts a GELF message chunk and returns an ARRAYREF representing the
unpacked chunk. Dies if the input is not a GELF chunk.
The message consists of the following keys:
id
sequence_number
sequence_count
data
## parse\_level( $ )
Accepts a `syslog` style level in the form of a number (1-7) or a string
being one of `emerg`, `alert`, `crit`, `err`, `warn`, `notice`,
`info`, or `debug`. Dies upon invalid input.
The string forms may also be elongated and will still be accepted. For
example `err` and `error` are equivalent.
The associated syslog level is returned in numeric form.
## parse\_size( $ )
Accepts an integer specifying the chunk size or the special string values
`lan` or `wan` corresponding to 8154 or 1420 respectively. An explanation
of these values is in the code.
Returns the passed size or the value corresponding to the `lan` or `wan`.
["parse\_size"](#parse_size) dies upon invalid input.
# CONSTANTS
All Log::Gelf::Util constants are Readonly perl structures. You must use
sigils when referencing them. They can be imported individually and are
included when importing ':all';
## $GELF\_MSG\_MAGIC
The magic number used to identify a GELF message chunk.
## $ZLIB\_MAGIC
The magic number used to identify a Zlib deflated message.
## $GZIP\_MAGIC
The magic number used to identify a gzipped message.
## %LEVEL\_NAME\_TO\_NUMBER
A HASH mapping the level names to numbers.
## %LEVEL\_NUMBER\_TO\_NAME
A HASH mapping the level numbers to names.
## %GELF\_MESSAGE\_FIELDS
A HASH where each key is a valid core GELF message field name. Deprecated
fields are associated with a false value.
# LICENSE
Copyright (C) Strategic Data.
This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
# AUTHOR
Adam Clarke &lt;adamc@strategicdata.com.au>

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requires 'perl', '5.008001';
requires 'Readonly' ,'2.00';
requires 'Params::Validate';
requires 'Time::HiRes';
requires 'Sys::Hostname';
requires 'JSON::MaybeXS';
requires 'Math::Random::MT';
on 'test' => sub {
requires 'Test::More', '0.98';
requires 'Test::Exception';
requires 'Test::Warnings', '0.005';
};

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liblog-gelf-util-perl (0.96-1) unstable; urgency=low
* Initial Release.
-- Mario Fetka <mario.fetka@gmail.com> Sun, 25 Feb 2018 14:37:50 +0100

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9

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Source: liblog-gelf-util-perl
Section: perl
Priority: optional
Maintainer: Mario Fetka <mario.fetka@gmail.com>
Build-Depends: debhelper (>= 9), libreadonly-perl, libparams-validate-perl, libjson-maybexs-perl, libmath-random-mt-perl, libtest-most-perl, libtest-warnings-perl, libmodule-build-tiny-perl,
perl
Standards-Version: 3.9.6
Homepage: https://metacpan.org/release/Log-GELF-Util
Package: liblog-gelf-util-perl
Architecture: all
Depends: ${misc:Depends}, ${perl:Depends}, libreadonly-perl, libparams-validate-perl, libjson-maybexs-perl, libmath-random-mt-perl
Description: Utility functions for Graylog's GELF format.
Log::GELF::Util is a collection of functions and data structures useful when
working with Graylog's GELF Format version 1.1. It strives to support all of
the features and options as described in the GELF
specification|http://docs.graylog.org/en/latest/pages/gelf.html.
.
This description was automagically extracted from the module by dh-make-perl.

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Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Source: https://metacpan.org/release/Log-GELF-Util
Upstream-Contact: Adam Clarke <adamc@strategicdata.com.au>
Upstream-Name: Log-GELF-Util
DISCLAIMER: This copyright info was automatically extracted
from the perl module. It may not be accurate, so you better
check the module sources in order to ensure the module for its
inclusion in Debian or for general legal information. Please,
if licensing information is incorrectly generated, file a bug
on dh-make-perl.
NOTE: Don't forget to remove this disclaimer once you are happy
with this file.
Files: *
Copyright: Adam Clarke <adamc@strategicdata.com.au>
License: Artistic or GPL-1+
Files: debian/*
Copyright: 2018, Mario Fetka <mario.fetka@gmail.com>
License: Artistic or GPL-1+
License: Artistic
This program is free software; you can redistribute it and/or modify
it under the terms of the Artistic License, which comes with Perl.
.
On Debian systems, the complete text of the Artistic License can be
found in `/usr/share/common-licenses/Artistic'.
License: GPL-1+
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 1, or (at your option)
any later version.
.
On Debian systems, the complete text of version 1 of the GNU General
Public License can be found in `/usr/share/common-licenses/GPL-1'.

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README.md

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#!/usr/bin/make -f
%:
dh $@

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3.0 (quilt)

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---
Archive: CPAN
Bug-Database: https://github.com/strategicdata/log-gelf-util/issues
Contact: Adam Clarke <adamc@strategicdata.com.au>
Name: Log-GELF-Util
Repository: git://github.com/strategicdata/log-gelf-util.git
Repository-Browse: https://github.com/strategicdata/log-gelf-util

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version=3
https://metacpan.org/release/Log-GELF-Util .*/Log-GELF-Util-v?(\d[\d.-]*)\.(?:tar(?:\.gz|\.bz2)?|tgz|zip)$

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lib/Log/GELF/Util.pm
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package Log::GELF::Util;
use 5.010;
use strict;
use warnings;
require Exporter;
use Readonly;
our (
$VERSION,
@ISA,
@EXPORT_OK,
%EXPORT_TAGS,
$GELF_MSG_MAGIC,
$ZLIB_MAGIC,
$GZIP_MAGIC,
%LEVEL_NAME_TO_NUMBER,
%LEVEL_NUMBER_TO_NAME,
%GELF_MESSAGE_FIELDS,
$LEVEL_NAME_REGEX,
);
$VERSION = "0.96";
use Params::Validate qw(
validate
validate_pos
validate_with
SCALAR
ARRAYREF
HASHREF
);
use Time::HiRes qw(time);
use Sys::Syslog qw(:macros);
use Sys::Hostname;
use JSON::MaybeXS qw(encode_json decode_json);
use IO::Compress::Gzip qw(gzip $GzipError);
use IO::Uncompress::Gunzip qw(gunzip $GunzipError);
use IO::Compress::Deflate qw(deflate $DeflateError);
use IO::Uncompress::Inflate qw(inflate $InflateError);
use Math::Random::MT qw(irand);
Readonly $GELF_MSG_MAGIC => pack('C*', 0x1e, 0x0f);
Readonly $ZLIB_MAGIC => pack('C*', 0x78, 0x9c);
Readonly $GZIP_MAGIC => pack('C*', 0x1f, 0x8b);
Readonly %LEVEL_NAME_TO_NUMBER => (
emerg => LOG_EMERG,
alert => LOG_ALERT,
crit => LOG_CRIT,
err => LOG_ERR,
warn => LOG_WARNING,
notice => LOG_NOTICE,
info => LOG_INFO,
debug => LOG_DEBUG,
);
Readonly %LEVEL_NUMBER_TO_NAME => (
&LOG_EMERG => 'emerg',
&LOG_ALERT => 'alert',
&LOG_CRIT => 'crit',
&LOG_ERR => 'err',
&LOG_WARNING => 'warn',
&LOG_NOTICE => 'notice',
&LOG_INFO => 'info',
&LOG_DEBUG => 'debug',
);
Readonly %GELF_MESSAGE_FIELDS => (
version => 1,
host => 1,
short_message => 1,
full_message => 1,
timestamp => 1,
level => 1,
facility => 0,
line => 0,
file => 0,
);
my $ln = '^(' .
(join '|', (keys %LEVEL_NAME_TO_NUMBER)) .
')\w*$';
$LEVEL_NAME_REGEX = qr/$ln/i;
undef $ln;
@ISA = qw(Exporter);
@EXPORT_OK = qw(
$GELF_MSG_MAGIC
$ZLIB_MAGIC
$GZIP_MAGIC
%LEVEL_NAME_TO_NUMBER
%LEVEL_NUMBER_TO_NAME
%GELF_MESSAGE_FIELDS
validate_message
encode
decode
compress
uncompress
enchunk
dechunk
is_chunked
decode_chunk
parse_level
parse_size
);
push @{ $EXPORT_TAGS{all} }, @EXPORT_OK ;
Exporter::export_ok_tags('all');
sub validate_message {
my %p = validate_with(
params => \@_,
allow_extra => 1,
spec => {
version => {
default => '1.1',
callbacks => {
version_check => sub {
my $version = shift;
$version =~ /^1\.1$/
or die 'version must be 1.1, supplied $version';
},
},
},
host => { type => SCALAR, default => hostname() },
short_message => { type => SCALAR },
full_message => { type => SCALAR, optional => 1 },
timestamp => {
type => SCALAR,
default => time(),
callbacks => {
ts_format => sub {
my $ts = shift;
$ts =~ /^\d+(?:\.\d+)*$/
or die 'bad timestamp';
},
},
},
level => { type => SCALAR, default => 1 },
facility => {
type => SCALAR,
optional => 1,
},
line => {
type => SCALAR,
optional => 1,
callbacks => {
facility_check => sub {
my $line = shift;
$line =~ /^\d+$/
or die 'line must be a number';
},
},
},
file => {
type => SCALAR,
optional => 1,
},
},
);
$p{level} = parse_level($p{level});
foreach my $key ( keys %p ) {
if ( ! $key =~ /^[\w\.\-]+$/ ) {
die "invalid field name '$key'";
}
if ( $key eq '_id' ||
! ( exists $GELF_MESSAGE_FIELDS{$key} || $key =~ /^_/ )
) {
die "invalid field '$key'";
}
if ( exists $GELF_MESSAGE_FIELDS{$key}
&& $GELF_MESSAGE_FIELDS{$key} == 0 ) {
# field is deprecated
warn "$key is deprecated, send as additional field instead";
}
}
return \%p;
}
sub encode {
my @p = validate_pos(
@_,
{ type => HASHREF },
);
return encode_json(validate_message(@p));
}
sub decode {
my @p = validate_pos(
@_,
{ type => SCALAR },
);
my $msg = shift @p;
return validate_message(decode_json($msg));
}
sub compress {
my @p = validate_pos(
@_,
{ type => SCALAR },
{
type => SCALAR,
default => 'gzip',
callbacks => {
compress_type => sub {
my $level = shift;
$level =~ /^(?:zlib|gzip)$/
or die 'compression type must be gzip (default) or zlib';
},
},
},
);
my ($message, $type) = @p;
my $method = \&gzip;
my $error = \$GzipError;
if ( $type eq 'zlib' ) {
$method = \&deflate;
$error = \$DeflateError;
}
my $msgz;
&{$method}(\$message => \$msgz)
or die "compress failed: ${$error}";
return $msgz;
}
sub uncompress {
my @p = validate_pos(
@_,
{ type => SCALAR }
);
my $message = shift @p;
my $msg_magic = substr $message, 0, 2;
my $method;
my $error;
if ($ZLIB_MAGIC eq $msg_magic) {
$method = \&inflate;
$error = \$InflateError;
}
elsif ($GZIP_MAGIC eq $msg_magic) {
$method = \&gunzip;
$error = \$GunzipError;
}
else {
#assume plain message
return $message;
}
my $msg;
&{$method}(\$message => \$msg)
or die "uncompress failed: ${$error}";
return $msg;
}
sub enchunk {
my @p = validate_pos(
@_,
{ type => SCALAR },
{ type => SCALAR, default => 'wan' },
{ type => SCALAR, default => pack('L*', irand(),irand()) },
);
my ($message, $size, $message_id) = @p;
if ( length $message_id != 8 ) {
die "message id must be 8 bytes";
}
$size = parse_size($size);
if ( $size > 0
&& length $message > $size
) {
my @chunks;
while (length $message) {
push @chunks, substr $message, 0, $size, '';
}
my $n_chunks = scalar @chunks;
die 'Message too big' if $n_chunks > 128;
my $sequence_count = pack('C*', $n_chunks);
my @chunks_w_header;
my $sequence_number = 0;
foreach my $chunk (@chunks) {
push @chunks_w_header,
$GELF_MSG_MAGIC
. $message_id
. pack('C*',$sequence_number++)
. $sequence_count
. $chunk;
}
return @chunks_w_header;
}
else {
return ($message);
}
}
sub dechunk {
my @p = validate_pos(
@_,
{ type => ARRAYREF },
{ type => HASHREF },
);
my ($accumulator, $chunk) = @_;
if ( ! exists $chunk->{id}
&& exists $chunk->{sequence_number}
&& exists $chunk->{sequence_count}
&& exists $chunk->{data}
) {
die 'malformed chunk';
}
if ($chunk->{sequence_number} > $chunk->{sequence_count} ) {
die 'chunk sequence number > count';
}
$accumulator->[$chunk->{sequence_number}] = $chunk->{data};
if ( (scalar grep {defined} @{$accumulator}) == $chunk->{sequence_count} ) {
return join '', @{$accumulator};
}
else {
return;
}
}
sub is_chunked {
my @p = validate_pos(
@_,
{ type => SCALAR },
);
my $chunk = shift @p;
return $GELF_MSG_MAGIC eq substr $chunk, 0, 2;
}
sub decode_chunk {
my @p = validate_pos(
@_,
{ type => SCALAR },
);
my $encoded_chunk = shift;
if ( is_chunked($encoded_chunk) ) {
my $id = substr $encoded_chunk, 2, 8;
my $seq_no = unpack('C', substr $encoded_chunk, 10, 1);
my $seq_cnt = unpack('C', substr $encoded_chunk, 11, 1);
my $data = substr $encoded_chunk, 12;
return {
id => $id,
sequence_number => $seq_no,
sequence_count => $seq_cnt,
data => $data,
};
}
else {
die "message not chunked";
}
}
sub parse_level {
my @p = validate_pos(
@_,
{ type => SCALAR }
);
my $level = shift @p;
if ( $level =~ $LEVEL_NAME_REGEX ) {
return $LEVEL_NAME_TO_NUMBER{$1};
}
elsif ( $level =~ /^(?:0|1|2|3|4|5|6|7)$/ ) {
return $level;
}
else {
die "level must be between 0 and 7 or a valid log level string";
}
}
sub parse_size {
my @p = validate_pos(
@_,
{
type => SCALAR,
callbacks => {
compress_type => sub {
my $size = shift;
$size =~ /^(?:lan|wan|\d+)$/i
or die 'chunk size must be "lan", "wan", a positve integer, or 0 (no chunking)';
},
},
},
);
my $size = lc(shift @p);
# These default values below were determined by
# examining the code for Graylog's implementation. See
# https://github.com/Graylog2/gelf-rb/blob/master/lib/gelf/notifier.rb#L62
# I believe these are determined by likely MTU defaults
# and possible heasers like so...
# WAN: 1500 - 8 b (UDP header) - 60 b (max IP header) - 12 b (chunking header) = 1420 b
# LAN: 8192 - 8 b (UDP header) - 20 b (min IP header) - 12 b (chunking header) = 8152 b
# Note that based on my calculation the Graylog LAN
# default may be 2 bytes too big (8154)
# See http://stackoverflow.com/questions/14993000/the-most-reliable-and-efficient-udp-packet-size
# For some discussion. I don't think this is an exact science!
if ( $size eq 'wan' ) {
$size = 1420;
}
elsif ( $size eq 'lan' ) {
$size = 8152;
}
return $size;
}
1;
__END__
=encoding utf-8
=head1 NAME
Log::GELF::Util - Utility functions for Graylog's GELF format.
=head1 SYNOPSIS
use Log::GELF::Util qw( encode );
my $msg = encode( { short_message => 'message', } );
use Log::GELF::Util qw( :all );
sub process_chunks {
my @accumulator;
my $msg;
do {
$msg = dechunk(
\@accumulator,
decode_chunk(shift())
);
} until ($msg);
return uncompress($msg);
};
my $hr = validate_message( short_message => 'message' );
=head1 DESCRIPTION
Log::GELF::Util is a collection of functions and data structures useful
when working with Graylog's GELF Format version 1.1. It strives to support
all of the features and options as described in the L<GELF
specification|http://docs.graylog.org/en/latest/pages/gelf.html>.
=head1 FUNCTIONS
=head2 validate_message( short_message => $ )
Returns a HASHREF representing the validated message with any defaulted
values added to the data structure.
Takes the following message parameters as per the GELF message
specification:
=over
=item short_message
Mandatory string, a short descriptive message
=item version
String, must be '1.1' which is the default.
=item host
String, defaults to hostname() from L<Sys::Hostname>.
=item timestamp
Timestamp, defaults to time() from L<Time::HiRes>.
=item level
Integer, equal to the standard syslog levels, default is 1 (ALERT).
=item facility
Deprecated, a warning will be issued.
=item line
Deprecated, a warning will be issued.
=item file
Deprecated, a warning will be issued.
=item _[additional_field]
Parameters prefixed with an underscore (_) will be treated as an additional
field. Allowed characters in field names are any word character (letter,
number, underscore), dashes and dots. As per the specification '_id' is
disallowed.
=back
=head2 encode( \% )
Accepts a HASHREF representing a GELF message. The message will be
validated with L</validate_message>.
Returns a JSON encoded string representing the message.
=head2 decode( $ )
Accepts a JSON encoded string representing the message. This will be
converted to a hashref and validated with L</validate_message>.
Returns a HASHREF representing the validated message with any defaulted
values added to the data structure.
=head2 compress( $ [, $] )
Accepts a string and compresses it. The second parameter is optional and
can take the value C<zlib> or C<gzip>, defaulting to C<gzip>.
Returns a compressed string.
=head2 uncompress( $ )
Accepts a string and uncompresses it. The compression method (C<gzip> or
C<zlib>) is determined automatically. Uncompressed strings are passed
through unaltered.
Returns an uncompressed string.
=head2 enchunk( $ [, $, $] )
Accepts an encoded message (JSON string) and chunks it according to the
GELF chunking protocol.
The optional second parameter is the maximum size of the chunks to produce,
this must be a positive integer or the special strings C<lan> or C<wan>,
see L</parse_size>. Defaults to C<wan>. A zero chunk size means no chunking
will be applied.
The optional third parameter is the message id used to identify associated
chunks. This must be 8 bytes. It defaults to 8 bytes of randomness generated
by L<Math::Random::MT>.
If the message size is greater than the maximum size then an array of
chunks is retuned, otherwise the message is retuned unaltered as the first
element of an array.
=head2 dechunk( \@, \% )
This facilitates reassembling a GELF message from a stream of chunks.
It accepts an ARRAYREF for accumulating the chunks and a HASHREF
representing a decoded message chunk as produced by L</decode_chunk>.
It returns undef if the accumulator is not complete, i.e. all chunks have
not yet been passed it.
Once the accumulator is complete it returns the de-chunked message in the
form of a string. Note that this message may still be compressed.
Here is an example usage:
sub process_chunks {
my @accumulator;
my $msg;
do {
$msg = dechunk(
\@accumulator,
decode_chunk(shift())
);
} until ($msg);
return uncompress($msg);
};
=head2 is_chunked( $ )
Accepts a string and returns a true value if it is a GELF message chunk.
=head2 decode_chunk( $ )
Accepts a GELF message chunk and returns an ARRAYREF representing the
unpacked chunk. Dies if the input is not a GELF chunk.
The message consists of the following keys:
id
sequence_number
sequence_count
data
=head2 parse_level( $ )
Accepts a C<syslog> style level in the form of a number (1-7) or a string
being one of C<emerg>, C<alert>, C<crit>, C<err>, C<warn>, C<notice>,
C<info>, or C<debug>. Dies upon invalid input.
The string forms may also be elongated and will still be accepted. For
example C<err> and C<error> are equivalent.
The associated syslog level is returned in numeric form.
=head2 parse_size( $ )
Accepts an integer specifying the chunk size or the special string values
C<lan> or C<wan> corresponding to 8154 or 1420 respectively. An explanation
of these values is in the code.
Returns the passed size or the value corresponding to the C<lan> or C<wan>.
L</parse_size> dies upon invalid input.
=head1 CONSTANTS
All Log::Gelf::Util constants are Readonly perl structures. You must use
sigils when referencing them. They can be imported individually and are
included when importing ':all';
=head2 $GELF_MSG_MAGIC
The magic number used to identify a GELF message chunk.
=head2 $ZLIB_MAGIC
The magic number used to identify a Zlib deflated message.
=head2 $GZIP_MAGIC
The magic number used to identify a gzipped message.
=head2 %LEVEL_NAME_TO_NUMBER
A HASH mapping the level names to numbers.
=head2 %LEVEL_NUMBER_TO_NAME
A HASH mapping the level numbers to names.
=head2 %GELF_MESSAGE_FIELDS
A HASH where each key is a valid core GELF message field name. Deprecated
fields are associated with a false value.
=head1 LICENSE
Copyright (C) Strategic Data.
This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
=head1 AUTHOR
Adam Clarke E<lt>adamc@strategicdata.com.auE<gt>
=cut

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minil.toml
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name = "Log-GELF-Util"
badges = ["travis"]
module_maker="ModuleBuildTiny"

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use strict;
use Test::More 0.98;
use_ok $_ for qw(
Log::GELF::Util
);
done_testing(1);

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t/01_utilities.t
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use strict;
use Test::More 0.98;
use Test::Exception;
use Log::GELF::Util qw(parse_size parse_level);
throws_ok{
my %msg = parse_size();
}
qr/0 parameters were passed.*/,
'parse_size mandatory parameters missing';
throws_ok{
my %msg = parse_size({});
}
qr/Parameter #1.*/,
'parse_size wrong type';
throws_ok{
my %msg = parse_size(-1);
}
qr/chunk size must be "lan", "wan", a positve integer, or 0 \(no chunking\)/,
'parse_size invalid numeric value';
throws_ok{
my %msg = parse_size('wrong');
}
qr/chunk size must be "lan", "wan", a positve integer, or 0 \(no chunking\)/,
'parse_size invalid string value';
my $size;
lives_ok{
$size = parse_size(1);
}
'numeric size';
is($size, 1, 'correct numeric size');
lives_ok{
$size = parse_size('lan');
}
'string lan size';
is($size, 8152, 'correct lan size');
lives_ok{
$size = parse_size('LAN');
}
'string LAN size';
is($size, 8152, 'correct LAN size');
lives_ok{
$size = parse_size('wan');
}
'string wan size';
is($size, 1420, 'correct numeric size');
lives_ok{
$size = parse_size('WAN');
}
'string WAN size';
is($size, 1420, 'correct WAN size');
throws_ok{
parse_level();
}
qr/0 parameters were passed.*/,
'parse_level mandatory parameters missing';
throws_ok{
parse_level({});
}
qr/Parameter #1.*/,
'parse_level wrong type';
throws_ok{
parse_level(-1);
}
qr/level must be between 0 and 7 or a valid log level string/,
'parse_level invalid numeric value';
throws_ok{
parse_level(8);
}
qr/level must be between 0 and 7 or a valid log level string/,
'parse_level invalid numeric value - too big';
throws_ok{
parse_level('wrong');
}
qr/level must be between 0 and 7 or a valid log level string/,
'parse_level invalid string value';
my $level;
lives_ok{
$level = parse_level(0);
}
'correct numeric level';
is($level, 0, 'correct numeric level min');
lives_ok{
$level = parse_level(7);
}
'correct numeric level';
is($level, 7, 'correct numeric level max');
my $level_no = 0;
foreach my $lvl_name (
qw(
emerg
alert
crit
err
warn
notice
info
debug
)
) {
lives_ok{
$level = parse_level($lvl_name);
}
"level $lvl_name ok";
is($level, $level_no++, "level $lvl_name correct value");
}
$level_no = 0;
foreach my $lvl_name (
qw(
emergency
alert
critical
error
warning
notice
information
debug
)
) {
lives_ok{
$level = parse_level($lvl_name);
}
"level long $lvl_name ok";
is($level, $level_no++, "level long $lvl_name correct value");
}
done_testing(55);

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use strict;
use Test::More 0.98;
use Test::Exception;
use Test::Warnings 0.005 qw(warning allow_warnings);
use Log::GELF::Util qw(validate_message);
throws_ok{
validate_message();
}
qr/Mandatory parameter 'short_message' missing.*/,
'mandatory parameters missing';
throws_ok{
validate_message(
version => '1.x',
host => 1,
short_message => 1,
);
}
qr/version must be 1.1, supplied.*/,
'version check';
throws_ok{
validate_message(
host => 1,
short_message => 1,
level => 'x',
);
}
qr/level must be between 0 and 7 or a valid log level string/,
'level check';
throws_ok{
validate_message(
host => 1,
short_message => 1,
timestamp => 'x',
);
}
qr/bad timestamp/,
'timestamp check';
throws_ok{
validate_message(
host => 1,
short_message => 1,
bad => 'to the bone.',
);
}
qr/invalid field 'bad'.*/,
'bad field check';
throws_ok{
validate_message(
host => 1,
short_message => 1,
'bad name' => 'to the bone.',
);
}
qr/invalid field 'bad name'.*/,
'bad field check 2';
allow_warnings 1; #throws legit warnings
throws_ok{
validate_message(
host => 1,
short_message => 1,
facility => {},
);
}
qr/The 'facility' parameter.*/,
'bad facility check';
throws_ok{
validate_message(
host => 1,
short_message => 1,
line => 'wrong',
);
}
qr/line must be a number/,
'bad line check';
allow_warnings 0;
like( warning {
validate_message(
host => 1,
short_message => 1,
facility => 1,
);
},
qr/^facility is deprecated.*/,
'facility deprecated');
like( warning {
validate_message(
host => 1,
short_message => 1,
line => 1,
);
},
qr/^line is deprecated.*/,
'line deprecated');
like( warning {
validate_message(
host => 1,
short_message => 1,
file => 1,
);
},
qr/^file is deprecated.*/,
'file deprecated');
my $msg;
lives_ok{
$msg = validate_message(
host => 1,
short_message => 1,
);
}
'default version';
my $time = time;
is($msg->{version}, '1.1', 'correct default version');
like($msg->{timestamp}, qr/\d+\.\d+/, 'default timestamp');
is($msg->{level}, 1, 'default level');
lives_ok{
$msg = validate_message(
host => 1,
short_message => 1,
level => 2,
);
}
'numeric level';
is($msg->{level}, 2, 'default level');
lives_ok{
$msg = validate_message(
host => 1,
short_message => 1,
level => 'err',
);
}
'numeric level';
is($msg->{level}, 3, 'default level');
allow_warnings 1; #throws legit warnings
lives_ok{
$msg = validate_message(
host => 1,
short_message => 1,
facility => 1,
);
}
'facility check';
ok(exists $msg->{facility}, 'line exists');
is($msg->{facility}, '1', 'correct facility');
lives_ok{
$msg = validate_message(
host => 1,
short_message => 1,
line => 1,
);
}
'line check';
ok(exists $msg->{line}, 'line exists');
is($msg->{line}, '1', 'correct line');
allow_warnings 0;
done_testing(26);

60
t/03_encode.t
View File

@ -1,60 +0,0 @@
use strict;
use Test::More 0.98;
use Test::Exception;
use JSON::MaybeXS qw(decode_json);
use Log::GELF::Util qw(encode decode);
throws_ok{
my %msg = encode();
}
qr/0 parameters were passed.*/,
'mandatory encode parameter missing';
throws_ok{
my %msg = encode({});
}
qr/Mandatory parameter 'short_message' missing.*/,
'mandatory encode parameters missing';
my $msg;
lives_ok{
$msg = decode_json(encode(
{
host => 'host',
short_message => 'message',
}
));
}
'encodes ok';
is($msg->{version}, '1.1', 'correct default version');
is($msg->{host}, 'host', 'correct default version');
throws_ok{
my %msg = decode();
}
qr/0 parameters were passed.*/,
'mandatory decode parameter missing';
throws_ok{
my %msg = decode("{}");
}
qr/Mandatory parameter 'short_message' missing.*/,
'mandatory encode parameters missing';
lives_ok{
$msg = decode(encode(
{
host => 'host',
short_message => 'message',
}
));
}
'encodes ok';
is($msg->{version}, '1.1', 'correct default version');
is($msg->{host}, 'host', 'correct default version');
done_testing(10);

116
t/04_compress.t
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@ -1,116 +0,0 @@
use strict;
use Test::More 0.91;
use Test::Exception;
use IO::Uncompress::Gunzip qw(gunzip $GunzipError);
use IO::Uncompress::Inflate qw(inflate $InflateError) ;
use JSON::MaybeXS qw(decode_json);
use Log::GELF::Util qw(encode compress uncompress);
throws_ok{
my %msg = compress();
}
qr/0 parameters were passed.*/,
'mandatory parameter missing';
throws_ok{
compress({});
}
qr/Parameter #1.*/,
'message parameters wrong type';
throws_ok{
my %msg = compress(1,'wrong');
}
qr/compression type must be gzip \(default\) or zlib/,
'type parameters wrong';
throws_ok{
my %msg = uncompress();
}
qr/0 parameters were passed.*/,
'mandatory parameter missing';
throws_ok{
my %msg = uncompress(
{},
);
}
qr/Parameter #1.*/,
'message parameters wrong type';
lives_ok{
compress( 1, 'gzip');
}
'gzips explicit ok';
lives_ok{
compress( 1, 'zlib');
}
'zlib explicit ok';
my $msgz;
lives_ok{
$msgz = compress(
encode(
{
host => 'host',
short_message => 'message',
}
)
);
}
'gzips ok';
my $msgj;
gunzip \$msgz => \$msgj
or die "gunzip failed: $GunzipError";
my $msg = decode_json($msgj);
is($msg->{version}, '1.1', 'correct default version');
is($msg->{host}, 'host', 'correct default version');
lives_ok{
$msg = decode_json(
uncompress($msgz)
);
}
'uncompresses gzip ok';
is($msg->{version}, '1.1', 'correct default version');
is($msg->{host}, 'host', 'correct default version');
my $msgz;
lives_ok{
$msgz = compress(
encode(
{
host => 'host',
short_message => 'message',
}
),
'zlib',
);
}
'deflates ok';
my $msgj;
inflate \$msgz => \$msgj
or die "inflate failed: $InflateError";
my $msg = decode_json($msgj);
is($msg->{version}, '1.1', 'correct default version');
is($msg->{host}, 'host', 'correct default version');
lives_ok{
$msg = decode_json(
uncompress($msgz)
);
}
'uncompresses zlib ok';
is($msg->{version}, '1.1', 'correct default version');
is($msg->{host}, 'host', 'correct default version');
done_testing(19);

186
t/05_chunked.t
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@ -1,186 +0,0 @@
use strict;
use warnings;
use Test::More;
use Test::Exception;
use List::Util qw(shuffle);
use Math::Random::MT qw(irand);
use Log::GELF::Util qw(
decode_chunk
compress
uncompress
is_chunked
enchunk
dechunk
decode_chunk
encode
$GELF_MSG_MAGIC
);
use JSON::MaybeXS qw(decode_json);
use IO::Uncompress::Gunzip qw(gunzip $GunzipError);
use IO::Uncompress::Inflate qw(inflate $InflateError);
sub test_dechunk {
my @chunks;
my $msg;
do {
$msg = dechunk(\@chunks, decode_chunk(shift()));
} until ($msg);
return uncompress( $msg );
};
throws_ok{
is_chunked();
}
qr/0 parameters were passed.*/,
'mandatory parameters missing';
ok( ! is_chunked( 'no magic' ), 'no magic' );
ok( is_chunked( $GELF_MSG_MAGIC ), 'magic' );
throws_ok{
enchunk();
}
qr/0 parameters were passed to Log::GELF::Util::enchunk but 3 were expected/,
'mandatory parameters missing';
throws_ok{
enchunk('0123456789', -1);
}
qr/chunk size must be "lan", "wan", a positve integer, or 0 \(no chunking\)/,
'enchunk negative size';
throws_ok{
enchunk('0123456789', 'xxx');
}
qr/chunk size must be "lan", "wan", a positve integer, or 0 \(no chunking\)/,
'enchunk bad size';
my @chunks;
lives_ok{
@chunks = enchunk('0123456789');
}
'enchunks ok - size default';
lives_ok{
@chunks = enchunk('0123456789', 0);
}
'enchunks ok - 0';
is(scalar @chunks, 1, 'correct number of chunks - 0');
lives_ok{
@chunks = enchunk('0123456789', 1);
}
'enchunks ok - 1';
is(scalar @chunks, 10, 'correct number of chunks - 1');
lives_ok{
@chunks = enchunk(
encode(
{
host => 'host',
short_message => 'message',
}
),
4
);
}
'enchunks ok - message';
throws_ok{
decode_chunk();
}
qr/0 parameters were passed.*/,
'mandatory parameter to decode_chunk missing';
my $chunk;
lives_ok{
$chunk = decode_chunk($chunks[0]);
}
'decode chunk succeeds';
ok($chunk->{id}, 'id exists');
is($chunk->{sequence_number}, 0, 'sequence correct');
is($chunk->{sequence_count}, scalar @chunks, 'sequence correct');
is(length($chunk->{data}), 4, 'chunk size correct');
my $msg = decode_json(test_dechunk(@chunks));
is($msg->{version}, '1.1', 'correct default version');
is($msg->{host}, 'host', 'correct default version');
lives_ok{
@chunks = enchunk(
compress(
encode(
{
host => 'host',
short_message => 'message',
}
)
),
4
);
}
'enchunks compressed gzip ok';
foreach my $i (1 .. 10) {
$msg = decode_json(test_dechunk(shuffle @chunks));
is($msg->{version}, '1.1', "correct default version $i");
is($msg->{host}, 'host', "correct host $i");
}
lives_ok{
@chunks = enchunk(
compress(
encode(
{
host => 'host',
short_message => 'message',
}
),
'zlib',
),
4
);
}
'enchunks compressed zlib ok';
$msg = decode_json(test_dechunk(@chunks));
is($msg->{version}, '1.1', 'correct default version');
is($msg->{host}, 'host', 'correct host');
throws_ok{
enchunk('0123456789', 2, '1234');
}
qr/message id must be 8 bytes/,
'message id bad size';
my @message_id = ( 1498382863, 3314914434 );
my $message_id = pack('L*', @message_id );
lives_ok{
@chunks = enchunk('0123456789', 2, $message_id );
}
'enchunks with message id';
my %ids;
foreach my $chunk (@chunks) {
my $decoded_chunk = decode_chunk($chunk);
$ids{$decoded_chunk->{id}} = 1;
}
is(scalar keys %ids, 1, 'one id across chunks');
$msg = decode_chunk(shift @chunks);
is($msg->{id}, $message_id, 'correct packed message id');
is((join '', unpack('LL', $msg->{id})), (join '', @message_id), 'correct message id');
done_testing(49);