-
Notifications
You must be signed in to change notification settings - Fork 1.8k
/
server.go
102 lines (87 loc) · 2.29 KB
/
server.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
/*
Copyright 2021 The Dapr 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 health
import (
"context"
"fmt"
"net/http"
"sync/atomic"
"time"
"github.com/dapr/kit/logger"
)
// Server is the interface for the healthz server.
type Server interface {
Run(context.Context, int) error
Ready()
NotReady()
}
type server struct {
ready *atomic.Bool
log logger.Logger
}
// NewServer returns a new healthz server.
func NewServer(log logger.Logger) Server {
return &server{
log: log,
ready: &atomic.Bool{},
}
}
// Ready sets a ready state for the endpoint handlers.
func (s *server) Ready() {
s.ready.Store(true)
}
// NotReady sets a not ready state for the endpoint handlers.
func (s *server) NotReady() {
s.ready.Store(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())
//nolint:gosec
srv := &http.Server{
Addr: fmt.Sprintf(":%d", port),
Handler: router,
}
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()
err := srv.Shutdown(shutdownCtx)
if err != nil {
s.log.Errorf("Error while shutting down healthz server: %v", err)
}
}
}()
s.log.Infof("Healthz server is listening on %s", srv.Addr)
// Blocking call
err := srv.ListenAndServe()
if err != http.ErrServerClosed {
return err
}
return nil
}
// 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.Load() {
status = http.StatusOK
} else {
status = http.StatusServiceUnavailable
}
w.WriteHeader(status)
})
}