88 lines
3.1 KiB
Go
88 lines
3.1 KiB
Go
// Mgmt
|
|
// Copyright (C) 2013-2017+ James Shubin and the project contributors
|
|
// Written by James Shubin <james@shubin.ca> and the project contributors
|
|
//
|
|
// 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/>.
|
|
|
|
// Package prometheus provides functions that are useful to control and manage
|
|
// the build-in prometheus instance.
|
|
package prometheus
|
|
|
|
import (
|
|
"net/http"
|
|
"strconv"
|
|
|
|
"github.com/prometheus/client_golang/prometheus"
|
|
"github.com/prometheus/client_golang/prometheus/promhttp"
|
|
)
|
|
|
|
// DefaultPrometheusListen is registered in
|
|
// https://github.com/prometheus/prometheus/wiki/Default-port-allocations
|
|
const DefaultPrometheusListen = "127.0.0.1:9233"
|
|
|
|
// Prometheus is the struct that contains information about the
|
|
// prometheus instance. Run Init() on it.
|
|
type Prometheus struct {
|
|
Listen string // the listen specification for the net/http server
|
|
|
|
checkApplyTotal *prometheus.CounterVec // total of CheckApplies that have been triggered
|
|
|
|
}
|
|
|
|
// Init some parameters - currently the Listen address.
|
|
func (obj *Prometheus) Init() error {
|
|
if len(obj.Listen) == 0 {
|
|
obj.Listen = DefaultPrometheusListen
|
|
}
|
|
obj.checkApplyTotal = prometheus.NewCounterVec(
|
|
prometheus.CounterOpts{
|
|
Name: "mgmt_checkapply_total",
|
|
Help: "Number of CheckApply that have run.",
|
|
},
|
|
// Labels for this metric.
|
|
// kind: resource type: Svc, File, ...
|
|
// apply: if the CheckApply happened in "apply" mode
|
|
// eventful: did the CheckApply generate an event
|
|
// errorful: did the CheckApply generate an error
|
|
[]string{"kind", "apply", "eventful", "errorful"},
|
|
)
|
|
prometheus.MustRegister(obj.checkApplyTotal)
|
|
|
|
return nil
|
|
}
|
|
|
|
// Start runs a http server in a go routine, that responds to /metrics
|
|
// as prometheus would expect.
|
|
func (obj *Prometheus) Start() error {
|
|
http.Handle("/metrics", promhttp.Handler())
|
|
go http.ListenAndServe(obj.Listen, nil)
|
|
return nil
|
|
}
|
|
|
|
// Stop the http server.
|
|
func (obj *Prometheus) Stop() error {
|
|
// TODO: There is no way in go < 1.8 to stop a http server.
|
|
// https://stackoverflow.com/questions/39320025/go-how-to-stop-http-listenandserve/41433555#41433555
|
|
return nil
|
|
}
|
|
|
|
// UpdateCheckApplyTotal refreshes the failing gauge by parsing the internal
|
|
// state map.
|
|
func (obj *Prometheus) UpdateCheckApplyTotal(kind string, apply, eventful, errorful bool) error {
|
|
labels := prometheus.Labels{"kind": kind, "apply": strconv.FormatBool(apply), "eventful": strconv.FormatBool(eventful), "errorful": strconv.FormatBool(errorful)}
|
|
metric := obj.checkApplyTotal.With(labels)
|
|
metric.Inc()
|
|
return nil
|
|
}
|