Mon::Client - Methods for interaction with Mon client

    use Mon::Client;

    Mon::Client is used to interact with "mon" clients. It supports
    a protocol-independent API for retrieving the status of the mon
    server, and performing certain operations, such as disableing hosts
    and service checks.

new

Creates a new object. A hash can be supplied which sets the default values. An example which contains all of the variables that you can initialize:

    $c = new Mon::Client (
        host => "monhost",
        port => 2583,
        username => "foo",
        password => "bar",
    );

password (pw)

If pw is provided, sets the password. Otherwise, returns the currently set password.

host (host)

If host is provided, sets the mon host. Otherwise, returns the currently set mon host.

port (portnum)

If portnum is provided, sets the mon port number. Otherwise, returns the currently set port number.

username (user)

If user is provided, sets the user login. Otherwise, returns the currently set user login.

prot

If protocol is provided, sets the protocol, specified by a string which is of the form 1.2.3, where 1 is the major revision, 2 is the minor revision, and 3 is the sub-minor revision. If protocol is not provided, the currently set protocol is returned.

protid ([protocol])

Returns true if client and server protocol match, false otherwise. Implicitly called by connect. If protocol is specified as an integer, supplies that protocol version to the server for verification.

version

Returns the protocol version of the remote server.

error

Returns the error string from set by the last method, or undef if there was no error.

connected

Returns 0 (not connected) or 1 (connected).

connect (%args)

Connects to the server. If host and port have not been set, uses the defaults. Returns undef on error. If CW$args{skip_protid} is true, skip protocol identification upon connect.

disconnect

Disconnects from the server. Return undef on error. %hash is optional, but if specified, should contain two keys, username and password. Performs the login command to authenticate the user to the server. Uses username and password if specified, otherwise uses the username and password previously set by those methods, respectively.

checkauth ( command )

Checks to see if the specified command, as executed by the current user, is authorized by the server, without actually executing the command. Returns 1 (command is authorized) or 0 (command is not authorized).

disable_watch ( watch )

Disables watch.

disable_service ( watch, service )

Disables a service, as specified by watch and service.

disable_host ( host )

Disables host.

enable_watch ( watch )

Enables watch.

enable_service ( watch, service )

Enables a service as specified by watch and service.

enable_host ( host )

Enables host.

set ( group, service, var, val )

Sets var in group,service to val. Returns undef on error.

get ( group, service, var )

Gets variable var in group,service and returns it, or undef on error.

quit

Logs out of the server. This method should be followed by a call to the disconnect method.

list_descriptions

Returns a hash of service descriptions, indexed by watch and service. For example:

    %desc = $mon->list_descriptions;
    print "$desc{'watchname'}->{'servicename'}\n";

list_deps

Lists dependency expressions and their components for all services. If there is no dependency for a particular service, then the value will be NONE.

    %deps = $mon->list_deps;
    foreach $watch (keys %deps) {
        foreach $service (keys %{$deps{$watch}}) {
            my $sref = \%{$deps{$watch}->{$service}};
            print "expr ($watch,$service) = $sref->{expression}\n";
            print "components ($watch,$service) = @{$sref->{components}}\n";
        }
    }

list_group ( hostgroup )

Lists members of hostgroup. Returns an array of each member.

list_watch

Returns an array of all the defined watch groups and services.

    foreach $w ($mon->list_watch) {
        print "group=$w->[0] service=$w->[1]\n";
    }

list_opstatus ( [group1, service1], ... )

Returns a hash of per-service operational statuses, as indexed by watch and service. The list of anonymous arrays is optional, and if is not provided then the status of all groups and services will be queried.

    %s = $mon->list_opstatus;
    foreach $watch (keys %s) {
        foreach $service (keys %{$s{$watch}}) {
            foreach $var (keys %{$s{$watch}{$service}}) {
                print "$watch $service $var=$s{$watch}{$service}{$var}\n";
            }
        }
    }

list_failures

Returns a hash in the same manner as list_opstatus, but only the services which are in a failure state.

list_successes

Returns a hash in the same manner as list_opstatus, but only the services which are in a success state.

list_disabled

Returns a hash of disabled watches, services, and hosts.

    %d = $mon->list_disabled;

    foreach $group (keys %{$d{"hosts"}}) {
        foreach $host (keys %{$d{"hosts"}{$group}}) {
            print "host $group/$host disabled\n";
        }
    }

    foreach $watch (keys %{$d{"services"}}) {
        foreach $service (keys %{$d{"services"}{$watch}}) {
            print "service $watch/$service disabled\n";
        }
    }

    for (keys %{$d{"watches"}}) {
        print "watch $_ disabled\n";
    }

list_alerthist

Returns an array of hash references containing the alert history.

    @a = $mon->list_alerthist;

    for (@a) {
        print join (" ",
            $_->{"type"},
            $_->{"watch"},
            $_->{"service"},
            $_->{"time"},
            $_->{"alert"},
            $_->{"args"},
            $_->{"summary"},
            "\n",
        );
    }

list_dtlog

Returns an array of hash references containing the downtime log. @a = CW$mon->list_dtlog

     for (@a) {
       print join (" ",
           $_->{"timeup"},
           $_->{"group"},
           $_->{"service"},
           $_->{"failtime"},
           $_->{"downtime"},
           $_->{"interval"},
           $_->{"summary"},
           "\n",
       );
     }

list_failurehist

Returns an array of hash references containing the failure history.

    @f = $mon->list_failurehist;

    for (@f) {
        print join (" ",
            $_->{"watch"},
            $_->{"service"},
            $_->{"time"},
            $_->{"summary"},
            "\n",
        );
    }

list_pids

Returns an array of hash references containing the list of process IDs of currently active monitors run by the server.

    @p = $mon->list_pids;

    $server = shift @p;

    for (@p) {
        print join (" ",
            $_->{"watch"},
            $_->{"service"},
            $_->{"pid"},
            "\n",
        );
    }

list_state

Lists the state of the scheduler. Returns a two-element array. The first element of the array is 0 if the scheduler is stopped, and 1 if the scheduler is currently running. The second element of the array returned is the string scheduler running if the scheduler is currently running, and if the scheduler is stopped, the second element is the time(2) that the scheduler was stopped.

    @s = $mon->list_state;

    if ($s[0] == 0) {
        print "scheduler stopped since " . localtime ($s[1]) . "\n";
    }

start

Starts the scheduler.

stop

Stops the scheduler.

reset

Resets the server.

reload ( what )

Causes the server to reload its configuration. what is an optional argument, and currently the only supported option is auth, which reloads the authorization file.

term

Terminates the server.

set_maxkeep

Sets the maximum number of history entries to store in memory.

get_maxkeep

Returns the maximum number of history entries to store in memory.

test ( test, group, service [, exitval, period])

Schedules a service test to run immediately, or tests an alert for a given period. test must be monitor, alert, startupalert, or upalert. To test alerts, the exitval and period must be supplied. Periods are identified by their label in the mon config file. If there are no period tags, then the actual period string must be used, exactly as it is listed in the config file.

test_config

Tests the syntax of the configuration file. Returns a two-element array. The first element of the array is 0 if the syntax of the config file is invalid, and 1 if the syntax of the config file is OK. The second element of the array returned is the failure message, if the config file has invalid syntax, and the result code if the config file syntax is OK. This function returns undef if it cannot get a connection or a response from the mon server. Config file checking stops as soon as an error is found, so you will need to run this command more than once if you have multiple errors in your config file in order to find them all.

    @s = $mon->test_config;

    if ($s[0] == 0) {
        print "error in config file:\n" . $s[1] . "\n";
    }

ack ( group, service, text )

When group/service is in a failure state, acknowledges this with text, and disables all further alerts during this failure period.

loadstate ( state )

Loads state.

savestate ( state )

Saves state.

servertime

Returns the time on the server using the same output as the time(2) system call. Sends a trap to a remote mon server. Here is an example:

    $mon->send_trap (
        group           => "remote-group",
        service         => "remote-service",
        retval          => 1,
        opstatus        => "operational status",
        summary         => "summary line",
        detail          => "multi-line detailed information",
    );

retval must be a nonnegative integer. opstatus must be one of fail, ok, coldstart, warmstart, linkdown, unknown, timeout, untested. Returns undef on error.