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nagiosbee.go
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nagiosbee.go
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/*
* Copyright (C) 2014 Daniel 'grindhold' Brendle
* 2014-2017 Christian Muehlhaeuser
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Authors:
* Daniel 'grindhold' Brendle <grindhold@skarphed.org>
* Christian Muehlhaeuser <muesli@gmail.com>
*/
/*
Please note that, in order to run this bee on a nagios-server, you
have to provide the nagios status-script found at
https://github.com/lizell/php-nagios-json/blob/master/statusJson.php
just drop this script in the htdocs-folder of your nagios-installation
and change the variable $statusFile to where the status.dat-file of your
installation resides
*/
// Package nagiosbee is a Bee that can interface with a Nagios instance.
package nagiosbee
import (
"encoding/json"
"io/ioutil"
"net/http"
"time"
"github.com/muesli/beehive/bees"
)
// NagiosBee is a Bee that can interface with a Nagios instance.
type NagiosBee struct {
bees.Bee
url string
user string
password string
services map[string]map[string]service // services[hostname][servicename]
eventChan chan bees.Event
}
type report struct {
Services map[string]map[string]service `json:"services"` // services[hostname][servicename]
}
type service struct {
HostName string `json:"host_name"`
ServiceDescription string `json:"service_description"`
CurrentState string `json:"current_state"`
LastHardState string `json:"last_hard_state"`
PluginOutput string `json:"plugin_output"`
}
func (mod *NagiosBee) announceStatuschange(s service) {
event := bees.Event{
Bee: mod.Name(),
Name: "status_change",
Options: []bees.Placeholder{
{
Name: "host",
Type: "string",
Value: s.HostName,
},
{
Name: "service",
Type: "string",
Value: s.ServiceDescription,
},
{
Name: "message",
Type: "string",
Value: s.PluginOutput,
},
{
Name: "status",
Type: "string",
Value: s.CurrentState,
},
},
}
mod.eventChan <- event
}
func (mod *NagiosBee) poll() {
request, err := http.NewRequest("GET", mod.url, nil)
if err != nil {
mod.LogErrorf("Could not build request: %s", err)
return
}
request.SetBasicAuth(mod.user, mod.password)
client := http.Client{}
resp, err := client.Do(request)
if err != nil {
mod.LogErrorf("Couldn't find status-JSON at %s: %s", mod.url, err)
return
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
mod.LogErrorf("Could not read data from API: %s", err)
return
}
rep := new(report)
err = json.Unmarshal(body, &rep)
if err != nil {
mod.LogErrorf("Failed to unmarshal JSON: %s", err)
return
}
// mod.Logln("Start crawling map", len(rep.Services))
var oldService service
var ok bool
for hn, mp := range rep.Services {
snmap := make(map[string]service)
for sn, s := range mp {
// mod.Logln(s)
if oldService, ok = mod.services[hn][sn]; !ok {
mod.announceStatuschange(s)
} else {
if s.CurrentState != oldService.CurrentState {
mod.announceStatuschange(s)
}
}
if s.CurrentState != s.LastHardState {
//TODO: Evaluate if good enough
}
snmap[sn] = rep.Services[hn][sn]
}
mod.services[hn] = snmap
}
}
// Run executes the Bee's event loop.
func (mod *NagiosBee) Run(cin chan bees.Event) {
mod.eventChan = cin
for {
select {
case <-mod.SigChan:
return
case <-time.After(time.Duration(10 * time.Second)):
mod.poll()
}
}
}
// ReloadOptions parses the config options and initializes the Bee.
func (mod *NagiosBee) ReloadOptions(options bees.BeeOptions) {
mod.SetOptions(options)
options.Bind("url", &mod.url)
options.Bind("user", &mod.user)
options.Bind("password", &mod.password)
}