/
etcd.go
115 lines (93 loc) · 2.33 KB
/
etcd.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
103
104
105
106
107
108
109
110
111
112
113
114
115
package main
import (
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"log"
"net/http"
"time"
)
type Etcd struct{}
type memb struct {
ClientURLs []string `json:"clientURLs"`
ID string `json:"id"`
Name string `json:"name"`
PeerURLs []string `json:"peerURLs"`
}
type members struct {
Members []memb `json:"members"`
}
// Read all members of an etcd cluster
func etcdMembers(url string, client *http.Client) (error, *members) {
resp, err := client.Get(url + "/v2/members")
if err != nil {
return err, nil
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
return errors.New("unsuccesful http status code"), nil
}
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return err, nil
}
members := &members{}
err = json.Unmarshal(body, &members)
if err != nil {
return err, nil
}
return nil, members
}
// Iterate over all members looking for health
func (e *Etcd) Check(srv Service) (bool, error) {
if srv.Timeout == 0 {
srv.Timeout = 30
}
timeout := time.Duration(time.Duration(srv.Timeout) * time.Second)
client := &http.Client{Timeout: timeout}
health := false
err, members := etcdMembers(srv.URL, client)
if err != nil {
return health, err
}
for _, m := range members.Members {
for _, url := range m.ClientURLs {
req, err := http.NewRequest(http.MethodGet, url+"/health", nil)
if err != nil {
return false, fmt.Errorf("newrequest: %v", err)
}
req.Close = true
resp, err := client.Do(req)
if err != nil {
log.Printf("failed to check health of member %s on %s: %v\n", m.ID, url, err)
continue
}
if resp == nil {
log.Printf("response body empty, member %s on %s\n", m.ID, url)
continue
}
if resp.StatusCode != 200 {
log.Printf("/health not found, member %s on %s\n", m.ID, url)
continue
}
result := struct{ Health string }{}
err = json.NewDecoder(resp.Body).Decode(&result)
io.Copy(ioutil.Discard, resp.Body)
resp.Body.Close()
if err != nil {
fmt.Printf("failed to check the health of member %s on %s: %v\n", m.ID, url, err)
continue
}
if result.Health == "true" {
health = true
// fmt.Printf("member %s is healthy: got healthy result from %s\n", m.ID, url)
} else {
fmt.Printf("member %s is unhealthy: got unhealthy result from %s\n", m.ID, url)
}
break
}
}
return health, nil
}