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/*
*
* Copyright 2019 Intel Corporation.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package main
import (
"context"
"net/http"
"os"
"os/signal"
"time"
"prom-kafka-writer/pkg/api"
logger "prom-kafka-writer/pkg/config"
kw "prom-kafka-writer/pkg/kafkawriter"
)
const defaultAddr = ":8686"
// main starts an http server on the $PORT environment variable.
func main() {
log := logger.GetLoggerInstance()
addr := defaultAddr
// $PORT environment variable is provided in the Kubernetes deployment.
if p := os.Getenv("PORT"); p != "" {
addr = ":" + p
}
log.Infow("Starting Prometheus Kafka writer", "addr", addr)
defer log.Infow("Prometheus Kafka writer Terminated")
s := &http.Server{
Handler: api.NewRouter(),
Addr: addr,
}
// shutdown hook. Wait for clean up if the pod/container is killed
shutdownChannel := make(chan struct{})
go func() {
log.Debug("msg", "Creating shutdown hooks")
sigChan := make(chan os.Signal, 1)
signal.Notify(sigChan, os.Interrupt)
<-sigChan
log.Debug("msg", "Received os.Interrupt")
log.Debug("msg", "Initiate cleanup")
//TODO: Cleanup here
kw.Cleanup()
time.Sleep(time.Second * 3)
_ = s.Shutdown(context.Background())
close(shutdownChannel)
}()
err := s.ListenAndServe()
if err != nil {
log.Fatalw("Server Error - Shutting down", "error", err)
}
<-shutdownChannel
}
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