Prometheus Kafka Writer Microservice

[demo.git] / vnfs / DAaaS / microservices / prom-kafka-writer / cmd / prom-kafka-writer / main.go

diff --git a/vnfs/DAaaS/microservices/prom-kafka-writer/cmd/prom-kafka-writer/main.go b/vnfs/DAaaS/microservices/prom-kafka-writer/cmd/prom-kafka-writer/main.go
new file mode 100644 (file)
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@@ -0,0 +1,71 @@
+/*
+ *
+ * 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
+}