/usr/share/perl5/Collectd/Unixsock.pm is in collectd-core 5.5.1-1build2.
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# collectd - bindings/buildperl/Collectd/Unixsock.pm
# Copyright (C) 2007,2008 Florian octo Forster
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
# DEALINGS IN THE SOFTWARE.
#
# Authors:
# Florian Forster <octo at collectd.org>
#
package Collectd::Unixsock;
=head1 NAME
Collectd::Unixsock - Abstraction layer for accessing the functionality by
collectd's unixsock plugin.
=head1 SYNOPSIS
use Collectd::Unixsock;
my $sock = Collectd::Unixsock->new ($path);
my $value = $sock->getval (%identifier);
$sock->putval (%identifier,
time => time (),
values => [123, 234, 345]);
$sock->destroy ();
=head1 DESCRIPTION
collectd's unixsock plugin allows external programs to access the values it has
collected or received and to submit own values. This Perl-module is simply a
little abstraction layer over this interface to make it even easier for
programmers to interact with the daemon.
=cut
use strict;
use warnings;
use Carp qw(cluck confess carp croak);
use IO::Socket::UNIX;
use Scalar::Util qw( looks_like_number );
our $Debug = 0;
sub _debug
{
print @_ if $Debug;
}
sub _create_socket
{
my $path = shift;
my $sock = IO::Socket::UNIX->new (Type => SOCK_STREAM, Peer => $path);
if (!$sock)
{
cluck ("Cannot open UNIX-socket $path: $!");
return;
}
return ($sock);
} # _create_socket
=head1 VALUE IDENTIFIERS
The values in the collectd are identified using a five-tuple (host, plugin,
plugin-instance, type, type-instance) where only plugin instance and type
instance may be undef. Many functions expect an I<%identifier> hash that has at
least the members B<host>, B<plugin>, and B<type>, possibly completed by
B<plugin_instance> and B<type_instance>.
Usually you can pass this hash as follows:
$self->method (host => $host, plugin => $plugin, type => $type, %other_args);
=cut
sub _create_identifier
{
my $args = shift;
my ($host, $plugin, $type);
if (!$args->{host} || !$args->{plugin} || !$args->{type})
{
cluck ("Need `host', `plugin' and `type'");
return;
}
$host = $args->{host};
$plugin = $args->{plugin};
$plugin .= '-' . $args->{plugin_instance} if defined $args->{plugin_instance};
$type = $args->{type};
$type .= '-' . $args->{type_instance} if defined $args->{type_instance};
return "$host/$plugin/$type";
} # _create_identifier
sub _parse_identifier
{
my $string = shift;
my ($plugin_instance, $type_instance);
my ($host, $plugin, $type) = split /\//, $string;
($plugin, $plugin_instance) = split /-/, $plugin, 2;
($type, $type_instance) = split /-/, $type, 2;
my $ident =
{
host => $host,
plugin => $plugin,
type => $type
};
$ident->{plugin_instance} = $plugin_instance if defined $plugin_instance;
$ident->{type_instance} = $type_instance if defined $type_instance;
return $ident;
} # _parse_identifier
sub _escape_argument
{
local $_ = shift;
return $_ if /^\w+$/;
s#\\#\\\\#g;
s#"#\\"#g;
return "\"$_\"";
}
# Send a command on a socket, including any required argument escaping.
# Return a single line of result.
sub _socket_command {
my ($self, $command, $args) = @_;
my $fh = $self->{sock} or confess ('object has no filehandle');
if($args) {
my $identifier = _create_identifier ($args) or return;
$command .= ' ' . _escape_argument ($identifier) . "\n";
} else {
$command .= "\n";
}
_debug "-> $command";
$fh->print($command);
my $response = $fh->getline;
chomp $response;
_debug "<- $response\n";
return $response;
}
# Read any remaining results from a socket and pass them to
# a callback for caller-defined mangling.
sub _socket_chat
{
my ($self, $msg, $callback, $cbdata) = @_;
my ($nresults, $ret);
my $fh = $self->{sock} or confess ('object has no filehandle');
($nresults, $msg) = split / /, $msg, 2;
if ($nresults <= 0)
{
$self->{error} = $msg;
return;
}
for (1 .. $nresults)
{
my $entry = $fh->getline;
chomp $entry;
_debug "<- $entry\n";
$callback->($entry, $cbdata);
}
return $cbdata;
}
=head1 PUBLIC METHODS
=over 4
=item I<$self> = Collectd::Unixsock->B<new> ([I<$path>]);
Creates a new connection to the daemon. The optional I<$path> argument gives
the path to the UNIX socket of the C<unixsock plugin> and defaults to
F</var/run/collectd-unixsock>. Returns the newly created object on success and
false on error.
=cut
sub new
{
my $class = shift;
my $path = shift || '/var/run/collectd-unixsock';
my $sock = _create_socket ($path) or return;
return bless
{
path => $path,
sock => $sock,
error => 'No error'
}, $class;
} # new
=item I<$res> = I<$self>-E<gt>B<getval> (I<%identifier>);
Requests a value-list from the daemon. On success a hash-ref is returned with
the name of each data-source as the key and the according value as, well, the
value. On error false is returned.
=cut
sub getval # {{{
{
my $self = shift;
my %args = @_;
my $ret = {};
my $msg = $self->_socket_command('GETVAL', \%args) or return;
$self->_socket_chat($msg, sub {
local $_ = shift;
my $ret = shift;
/^(\w+)=NaN$/ and $ret->{$1} = undef, return;
/^(\w+)=(.*)$/ and looks_like_number($2) and $ret->{$1} = 0 + $2, return;
}, $ret
);
return $ret;
} # }}} sub getval
=item I<$res> = I<$self>-E<gt>B<getthreshold> (I<%identifier>);
Requests a threshold from the daemon. On success a hash-ref is returned with
the threshold data. On error false is returned.
=cut
sub getthreshold # {{{
{
my $self = shift;
my %args = @_;
my $ret = {};
my $msg = $self->_socket_command('GETTHRESHOLD', \%args) or return;
$self->_socket_chat($msg, sub {
local $_ = shift;
my $ret = shift;
my ( $key, $val );
( $key, $val ) = /^\s*([^:]+):\s*(.*)/ and do {
$key =~ s/\s*$//;
$ret->{$key} = $val;
};
}, $ret
);
return $ret;
} # }}} sub getthreshold
=item I<$self>-E<gt>B<putval> (I<%identifier>, B<time> =E<gt> I<$time>, B<values> =E<gt> [...]);
Submits a value-list to the daemon. If the B<time> argument is omitted
C<time()> is used. The required argument B<values> is a reference to an array
of values that is to be submitted. The number of values must match the number
of values expected for the given B<type> (see L<VALUE IDENTIFIERS>), though
this is checked by the daemon, not the Perl module. Also, gauge data-sources
(e.E<nbsp>g. system-load) may be C<undef>. Returns true upon success and false
otherwise.
=cut
sub putval
{
my $self = shift;
my %args = @_;
my ($status, $msg, $identifier, $values);
my $fh = $self->{sock} or confess;
my $interval = defined $args{interval} ?
' interval=' . _escape_argument ($args{interval}) : '';
$identifier = _create_identifier (\%args) or return;
if (!$args{values})
{
cluck ("Need argument `values'");
return;
}
if (ref ($args{values}))
{
my $time;
if ("ARRAY" ne ref ($args{values}))
{
cluck ("Invalid `values' argument (expected an array ref)");
return;
}
if (! scalar @{$args{values}})
{
cluck ("Empty `values' array");
return;
}
$time = $args{time} || time;
$values = join (':', $time, map { defined $_ ? $_ : 'U' } @{$args{values}});
}
else
{
$values = $args{values};
}
$msg = 'PUTVAL '
. _escape_argument ($identifier)
. $interval
. ' ' . _escape_argument ($values) . "\n";
_debug "-> $msg";
$fh->print($msg);
$msg = <$fh>;
chomp $msg;
_debug "<- $msg\n";
($status, $msg) = split / /, $msg, 2;
return 1 if $status == 0;
$self->{error} = $msg;
return;
} # putval
=item I<$res> = I<$self>-E<gt>B<listval_filter> ( C<%identifier> )
Queries a list of values from the daemon while restricting the results to
certain hosts, plugins etc. The argument may be anything that passes for an
identifier (cf. L<VALUE IDENTIFIERS>), although all fields are optional.
The returned data is in the same format as from C<listval>.
=cut
sub listval_filter
{
my $self = shift;
my %args = @_;
my @ret;
my $nresults;
my $fh = $self->{sock} or confess;
my $pattern =
(exists $args{host} ? "$args{host}" : '[^/]+') .
(exists $args{plugin} ? "/$args{plugin}" : '/[^/-]+') .
(exists $args{plugin_instance} ? "-$args{plugin_instance}" : '(?:-[^/]+)?') .
(exists $args{type} ? "/$args{type}" : '/[^/-]+') .
(exists $args{type_instance} ? "-$args{type_instance}" : '(?:-[^/]+)?');
$pattern = qr/^\d+ $pattern$/;
my $msg = $self->_socket_command('LISTVAL') or return;
($nresults, $msg) = split / /, $msg, 2;
# This could use _socket_chat() but doesn't for speed reasons
if ($nresults < 0)
{
$self->{error} = $msg;
return;
}
for (1 .. $nresults)
{
$msg = <$fh>;
chomp $msg;
_debug "<- $msg\n";
next unless $msg =~ $pattern;
my ($time, $ident) = split / /, $msg, 2;
$ident = _parse_identifier ($ident);
$ident->{time} = int $time;
push (@ret, $ident);
} # for (i = 0 .. $status)
return @ret;
} # listval
=item I<$res> = I<$self>-E<gt>B<listval> ()
Queries a list of values from the daemon. The list is returned as an array of
hash references, where each hash reference is a valid identifier. The C<time>
member of each hash holds the epoch value of the last update of that value.
=cut
sub listval
{
my $self = shift;
my $nresults;
my @ret;
my $fh = $self->{sock} or confess;
my $msg = $self->_socket_command('LISTVAL') or return;
($nresults, $msg) = split / /, $msg, 2;
# This could use _socket_chat() but doesn't for speed reasons
if ($nresults < 0)
{
$self->{error} = $msg;
return;
}
for (1 .. $nresults)
{
$msg = <$fh>;
chomp $msg;
_debug "<- $msg\n";
my ($time, $ident) = split / /, $msg, 2;
$ident = _parse_identifier ($ident);
$ident->{time} = int $time;
push (@ret, $ident);
} # for (i = 0 .. $status)
return @ret;
} # listval
=item I<$res> = I<$self>-E<gt>B<putnotif> (B<severity> =E<gt> I<$severity>, B<message> =E<gt> I<$message>, ...);
Submits a notification to the daemon.
Valid options are:
=over 4
=item B<severity>
Sets the severity of the notification. The value must be one of the following
strings: C<failure>, C<warning>, or C<okay>. Case does not matter. This option
is mandatory.
=item B<message>
Sets the message of the notification. This option is mandatory.
=item B<time>
Sets the time. If omitted, C<time()> is used.
=item I<Value identifier>
All the other fields of the value identifiers, B<host>, B<plugin>,
B<plugin_instance>, B<type>, and B<type_instance>, are optional. When given,
the notification is associated with the performance data of that identifier.
For more details, please see L<collectd-unixsock(5)>.
=back
=cut
sub putnotif
{
my $self = shift;
my %args = @_;
my $status;
my $fh = $self->{sock} or confess;
my $msg; # message sent to the socket
for my $arg (qw( message severity ))
{
cluck ("Need argument `$arg'"), return unless $args{$arg};
}
$args{severity} = lc $args{severity};
if (($args{severity} ne 'failure')
&& ($args{severity} ne 'warning')
&& ($args{severity} ne 'okay'))
{
cluck ("Invalid `severity: " . $args{severity});
return;
}
$args{time} ||= time;
$msg = 'PUTNOTIF '
. join (' ', map { $_ . '=' . _escape_argument ($args{$_}) } keys %args)
. "\n";
_debug "-> $msg";
$fh->print($msg);
$msg = <$fh>;
chomp $msg;
_debug "<- $msg\n";
($status, $msg) = split / /, $msg, 2;
return 1 if $status == 0;
$self->{error} = $msg;
return;
} # putnotif
=item I<$self>-E<gt>B<flush> (B<timeout> =E<gt> I<$timeout>, B<plugins> =E<gt> [...], B<identifier> =E<gt> [...]);
Flush cached data.
Valid options are:
=over 4
=item B<timeout>
If this option is specified, only data older than I<$timeout> seconds is
flushed.
=item B<plugins>
If this option is specified, only the selected plugins will be flushed. The
argument is a reference to an array of strings.
=item B<identifier>
If this option is specified, only the given identifier(s) will be flushed. The
argument is a reference to an array of identifiers. Identifiers, in this case,
are hash references and have the members as outlined in L<VALUE IDENTIFIERS>.
=back
=cut
sub flush
{
my $self = shift;
my %args = @_;
my $fh = $self->{sock} or confess;
my $status = 0;
my $msg = "FLUSH";
$msg .= " timeout=$args{timeout}" if defined $args{timeout};
if ($args{plugins})
{
foreach my $plugin (@{$args{plugins}})
{
$msg .= " plugin=" . $plugin;
}
}
if ($args{identifier})
{
for my $identifier (@{$args{identifier}})
{
my $ident_str;
if (ref ($identifier) ne 'HASH')
{
cluck ("The argument of the `identifier' "
. "option must be an array of hashrefs.");
return;
}
$ident_str = _create_identifier ($identifier) or return;
$msg .= ' identifier=' . _escape_argument ($ident_str);
}
}
$msg .= "\n";
_debug "-> $msg";
$fh->print($msg);
$msg = <$fh>;
chomp ($msg);
_debug "<- $msg\n";
($status, $msg) = split / /, $msg, 2;
return 1 if $status == 0;
$self->{error} = $msg;
return;
}
sub error
{
return shift->{error};
}
=item I<$self>-E<gt>destroy ();
Closes the socket before the object is destroyed. This function is also
automatically called then the object goes out of scope.
=back
=cut
sub destroy
{
my $self = shift;
if ($self->{sock})
{
close $self->{sock};
delete $self->{sock};
}
}
sub DESTROY
{
my $self = shift;
$self->destroy ();
}
=head1 SEE ALSO
L<collectd(1)>,
L<collectd.conf(5)>,
L<collectd-unixsock(5)>
=head1 AUTHOR
Florian octo Forster E<lt>octo@collectd.orgE<gt>
=cut
1;
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