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healthServer.go
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healthServer.go
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// Copyright Istio Authors
//
// 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 nodeagent
import (
"net/http"
"sync/atomic"
"istio.io/istio/cni/pkg/constants"
)
// StartHealthServer initializes and starts a web server that exposes liveness and readiness endpoints at port 8000.
func StartHealthServer() (installReady *atomic.Value, watchReady *atomic.Value) {
router := http.NewServeMux()
installReady, watchReady = initRouter(router)
go func() {
_ = http.ListenAndServe(":"+constants.ReadinessPort, router)
}()
return
}
func initRouter(router *http.ServeMux) (installReady *atomic.Value, watchReady *atomic.Value) {
installReady = &atomic.Value{}
watchReady = &atomic.Value{}
installReady.Store(false)
watchReady.Store(false)
router.HandleFunc(constants.LivenessEndpoint, healthz)
router.HandleFunc(constants.ReadinessEndpoint, readyz(installReady, watchReady))
return
}
func healthz(w http.ResponseWriter, _ *http.Request) {
w.WriteHeader(http.StatusOK)
}
func readyz(installReady, watchReady *atomic.Value) http.HandlerFunc {
return func(w http.ResponseWriter, _ *http.Request) {
if !installReady.Load().(bool) || !watchReady.Load().(bool) {
http.Error(w, http.StatusText(http.StatusServiceUnavailable), http.StatusServiceUnavailable)
return
}
w.WriteHeader(http.StatusOK)
}
}