1 // Copyright 2022 Google LLC 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package ready 16 17 import ( 18 "fmt" 19 "net/http" 20 21 "github.com/GoogleCloudPlatform/k8s-config-connector/pkg/logging" 22 ) 23 24 const ( 25 ReadinessServerPort = 23232 26 ReadinessServerPath = "/ready" 27 ) 28 29 var ready = false 30 31 // SetContainerAsReady sets up an HTTP server for the readiness probe to check 32 func SetContainerAsReady() { 33 // Avoid starting up another HTTP server if we had alread started one to 34 // avoid a port conflict error which would cause an application crash due 35 // to the logging.Fatal() call below. 36 if ready { 37 return 38 } 39 40 mux := http.NewServeMux() 41 mux.HandleFunc(ReadinessServerPath, func(res http.ResponseWriter, _ *http.Request) { 42 res.WriteHeader(http.StatusOK) 43 }) 44 45 go func() { 46 port := fmt.Sprintf(":%v", ReadinessServerPort) 47 logging.Fatal(http.ListenAndServe(port, mux), "error while running HTTP server to indicate readiness") 48 }() 49 50 ready = true 51 } 52