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probes.go
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probes.go
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// Copyright 2019 VMware, Inc.
// SPDX-License-Identifier: Apache-2.0
//
// 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 probes
import (
"fmt"
"net/http"
"github.com/adodon2go/networkservicemesh/pkg/probes/health"
"github.com/sirupsen/logrus"
)
const (
healthcheckProbesPort = "0.0.0.0:5555"
)
//Probes - Network Service Manager readiness probes
type Probes interface {
BeginHealthCheck()
health.Appender
}
type probesImpl struct {
name string
goals Goals
*health.AppenderImpl
}
// New creates new Network Service Manager readiness probes
func New(name string, goals Goals) Probes {
return &probesImpl{
name: name,
goals: goals,
AppenderImpl: new(health.AppenderImpl),
}
}
func (probes *probesImpl) readiness(w http.ResponseWriter, r *http.Request) {
if probes.goals != nil && !probes.goals.IsComplete() {
http.Error(w, probes.goals.Status(), http.StatusServiceUnavailable)
return
}
var err error
probes.Iterate(func(checker health.ApplicationHealth) bool {
err = checker.Check()
return err == nil
})
if err != nil {
http.Error(w, fmt.Sprintf("Goals status: %v, health check status: %v", probes.goals.Status(), err), http.StatusServiceUnavailable)
return
}
_, _ = w.Write([]byte("OK"))
}
func (probes *probesImpl) liveness(w http.ResponseWriter, r *http.Request) {
_, _ = w.Write([]byte("OK"))
}
// BeginHealthCheck starts listening 5555 port for health check
func (probes *probesImpl) BeginHealthCheck() {
go func() {
logrus.Debugf("Starting %v", probes.name)
http.HandleFunc("/liveness", probes.liveness)
http.HandleFunc("/readiness", probes.readiness)
err := http.ListenAndServe(healthcheckProbesPort, nil)
if err != nil {
logrus.Errorf("Probes: serve error: %v", err)
}
}()
}