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server.go
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server.go
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// ------------------------------------------------------------
// Copyright (c) Microsoft Corporation and Dapr Contributors.
// Licensed under the MIT License.
// ------------------------------------------------------------
package health
import (
"context"
"fmt"
"net/http"
"time"
"github.com/dapr/dapr/pkg/logger"
)
// Server is the interface for the healthz server
type Server interface {
Run(context.Context, int) error
Ready()
NotReady()
}
type server struct {
ready bool
log logger.Logger
}
// NewServer returns a new healthz server
func NewServer(log logger.Logger) Server {
return &server{
log: log,
}
}
// Ready sets a ready state for the endpoint handlers
func (s *server) Ready() {
s.ready = true
}
// NotReady sets a not ready state for the endpoint handlers
func (s *server) NotReady() {
s.ready = false
}
// Run starts a net/http server with a healthz endpoint
func (s *server) Run(ctx context.Context, port int) error {
router := http.NewServeMux()
router.Handle("/healthz", s.healthz())
srv := &http.Server{
Addr: fmt.Sprintf(":%d", port),
Handler: router,
}
doneCh := make(chan struct{})
go func() {
select {
case <-ctx.Done():
s.log.Info("Healthz server is shutting down")
shutdownCtx, cancel := context.WithTimeout(
context.Background(),
time.Second*5,
)
defer cancel()
srv.Shutdown(shutdownCtx) // nolint: errcheck
case <-doneCh:
}
}()
s.log.Infof("Healthz server is listening on %s", srv.Addr)
err := srv.ListenAndServe()
if err != http.ErrServerClosed {
s.log.Errorf("Healthz server error: %s", err)
}
close(doneCh)
return err
}
// healthz is a health endpoint handler
func (s *server) healthz() http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
var status int
if s.ready {
status = http.StatusOK
} else {
status = http.StatusServiceUnavailable
}
w.WriteHeader(status)
})
}