3 * Copyright 2019 Intel Corporation.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 * http://www.apache.org/licenses/LICENSE-2.0
8 * Unless required by applicable law or agreed to in writing, software
9 * distributed under the License is distributed on an "AS IS" BASIS,
10 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
11 * See the License for the specific language governing permissions and
12 * limitations under the License.
25 "prom-kafka-writer/pkg/api"
26 logger "prom-kafka-writer/pkg/config"
27 kw "prom-kafka-writer/pkg/kafkawriter"
30 const defaultAddr = ":8686"
32 // main starts an http server on the $PORT environment variable.
34 log := logger.GetLoggerInstance()
37 // $PORT environment variable is provided in the Kubernetes deployment.
38 if p := os.Getenv("PORT"); p != "" {
42 log.Infow("Starting Prometheus Kafka writer", "addr", addr)
43 defer log.Infow("Prometheus Kafka writer Terminated")
46 Handler: api.NewRouter(),
50 // shutdown hook. Wait for clean up if the pod/container is killed
51 shutdownChannel := make(chan struct{})
53 log.Debug("msg", "Creating shutdown hooks")
54 sigChan := make(chan os.Signal, 1)
55 signal.Notify(sigChan, os.Interrupt)
57 log.Debug("msg", "Received os.Interrupt")
58 log.Debug("msg", "Initiate cleanup")
61 time.Sleep(time.Second * 3)
62 _ = s.Shutdown(context.Background())
63 close(shutdownChannel)
66 err := s.ListenAndServe()
68 log.Fatalw("Server Error - Shutting down", "error", err)