/
kube_health.go
73 lines (66 loc) · 1.87 KB
/
kube_health.go
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// Copyright 2020 Google LLC
//
// 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 server
import (
"context"
"fmt"
"net/http"
"github.com/apigee/apigee-remote-service-golib/log"
"google.golang.org/grpc/health"
"google.golang.org/grpc/health/grpc_health_v1"
)
func NewKubeHealth(handler *Handler, health *health.Server) *KubeHealth {
kubeHealth := &KubeHealth{
Handler: handler,
Health: health,
}
go func() {
_ = handler.productMan.Products() // blocks until ready
kubeHealth.ready = true
}()
return kubeHealth
}
type KubeHealth struct {
Handler *Handler
Health *health.Server
ready bool
}
// nil if ok, error with message if not
func (h *KubeHealth) error() error {
if !h.ready {
return fmt.Errorf("products not loaded")
}
in := &grpc_health_v1.HealthCheckRequest{}
response, err := h.Health.Check(context.Background(), in)
if err != nil {
return err
}
if response.Status != grpc_health_v1.HealthCheckResponse_SERVING {
return fmt.Errorf(response.Status.String())
}
return nil
}
// KubeHealth returns http.HandlerFunc for endpoint
func (h *KubeHealth) HandlerFunc() http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
if err := h.error(); err != nil {
w.WriteHeader(500)
if _, err := w.Write([]byte(err.Error())); err != nil {
log.Warnf("healthz unable to respond: %s", err)
}
return
}
w.WriteHeader(200)
}
}