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main.go
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main.go
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// Copyright (c) 2020 Fandom, Inc.
//
// 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.
package main
import (
"github.com/kelseyhightower/envconfig"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
log "github.com/sirupsen/logrus"
"net/http"
"time"
)
type PrometheusExporterConfiguration struct {
PoolCounterAddress string `default:"localhost:7531" split_words:"true"`
ListenAddress string `default:"localhost:8000" split_words:"true"`
LogsAsJson bool `default:"false" split_words:"true"`
CollectorTimeoutSeconds int `default:"5" split_words:"true"`
ServerTimeoutSeconds int `default:"3" split_words:"true"`
}
func main() {
var configuration PrometheusExporterConfiguration
err := envconfig.Process("exporter", &configuration)
if err != nil {
log.Fatal(err.Error())
}
if configuration.LogsAsJson {
log.SetFormatter(&log.JSONFormatter{
FieldMap: log.FieldMap{
log.FieldKeyTime: "@timestamp",
log.FieldKeyMsg: "@message",
},
})
}
srv := &http.Server{
Addr: configuration.ListenAddress,
WriteTimeout: time.Second * time.Duration(configuration.ServerTimeoutSeconds),
ReadTimeout: time.Second * time.Duration(configuration.ServerTimeoutSeconds),
IdleTimeout: time.Second * time.Duration(configuration.ServerTimeoutSeconds),
}
log.Infof("Configuring collector to scrape from %s", configuration.PoolCounterAddress)
collector := newPoolCounterCollector(configuration)
prometheus.MustRegister(collector)
http.Handle("/prometheus", promhttp.Handler())
http.HandleFunc("/", func(response http.ResponseWriter, request *http.Request) {
response.Write([]byte("EXPORTER ALIVE"))
})
log.Infof("Starting Prometheus collector on %s", configuration.ListenAddress)
if err := srv.ListenAndServe(); err != nil {
log.Error(err)
}
}