/
health.go
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/
health.go
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// Copyright 2017 Google Inc. All Rights Reserved.
// 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 (
"log"
"net/http"
"golang.org/x/net/context"
"google.golang.org/grpc/health"
healthpb "google.golang.org/grpc/health/grpc_health_v1"
)
type healthHandler struct {
healthServer *health.Server
}
func httpHealthServer(server *health.Server) http.Handler {
return &healthHandler{server}
}
func (h *healthHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
hcr, err := h.healthServer.Check(context.Background(), &healthpb.HealthCheckRequest{""})
if err != nil {
log.Println("Error checking gRPC server health", err)
w.WriteHeader(http.StatusServiceUnavailable)
return
}
switch hcr.Status.String() {
case "UNKNOWN":
w.WriteHeader(http.StatusServiceUnavailable)
case "SERVING":
w.WriteHeader(http.StatusOK)
case "NOT_SERVING":
w.WriteHeader(http.StatusServiceUnavailable)
}
}