/
http_healthcheck.go
100 lines (85 loc) · 2.38 KB
/
http_healthcheck.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
// SPDX-License-Identifier: MIT
// SPDX-FileCopyrightText: 2023 mochi-mqtt, mochi-co
// SPDX-FileContributor: Derek Duncan
package listeners
import (
"context"
"log/slog"
"net/http"
"sync"
"sync/atomic"
"time"
)
// HTTPHealthCheck is a listener for providing an HTTP healthcheck endpoint.
type HTTPHealthCheck struct {
sync.RWMutex
id string // the internal id of the listener
address string // the network address to bind to
config *Config // configuration values for the listener
listen *http.Server // the http server
end uint32 // ensure the close methods are only called once
}
// NewHTTPHealthCheck initialises and returns a new HTTP listener, listening on an address.
func NewHTTPHealthCheck(id, address string, config *Config) *HTTPHealthCheck {
if config == nil {
config = new(Config)
}
return &HTTPHealthCheck{
id: id,
address: address,
config: config,
}
}
// ID returns the id of the listener.
func (l *HTTPHealthCheck) ID() string {
return l.id
}
// Address returns the address of the listener.
func (l *HTTPHealthCheck) Address() string {
return l.address
}
// Protocol returns the address of the listener.
func (l *HTTPHealthCheck) Protocol() string {
if l.listen != nil && l.listen.TLSConfig != nil {
return "https"
}
return "http"
}
// Init initializes the listener.
func (l *HTTPHealthCheck) Init(_ *slog.Logger) error {
mux := http.NewServeMux()
mux.HandleFunc("/healthcheck", func(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodGet {
w.WriteHeader(http.StatusMethodNotAllowed)
}
})
l.listen = &http.Server{
ReadTimeout: 5 * time.Second,
WriteTimeout: 5 * time.Second,
Addr: l.address,
Handler: mux,
}
if l.config.TLSConfig != nil {
l.listen.TLSConfig = l.config.TLSConfig
}
return nil
}
// Serve starts listening for new connections and serving responses.
func (l *HTTPHealthCheck) Serve(establish EstablishFn) {
if l.listen.TLSConfig != nil {
_ = l.listen.ListenAndServeTLS("", "")
} else {
_ = l.listen.ListenAndServe()
}
}
// Close closes the listener and any client connections.
func (l *HTTPHealthCheck) Close(closeClients CloseFn) {
l.Lock()
defer l.Unlock()
if atomic.CompareAndSwapUint32(&l.end, 0, 1) {
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
_ = l.listen.Shutdown(ctx)
}
closeClients(l.id)
}