File: sentinel_test.go

package info (click to toggle)
golang-gopkg-redis.v2 2.3.2-2
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 280 kB
  • sloc: makefile: 6
file content (185 lines) | stat: -rw-r--r-- 3,895 bytes parent folder | download | duplicates (2)
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
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
package redis_test

import (
	"io/ioutil"
	"os"
	"os/exec"
	"path/filepath"
	"testing"
	"text/template"
	"time"

	"gopkg.in/redis.v2"
)

func startRedis(port string) (*exec.Cmd, error) {
	cmd := exec.Command("redis-server", "--port", port)
	if false {
		cmd.Stdout = os.Stdout
		cmd.Stderr = os.Stderr
	}
	if err := cmd.Start(); err != nil {
		return nil, err
	}
	return cmd, nil
}

func startRedisSlave(port, slave string) (*exec.Cmd, error) {
	cmd := exec.Command("redis-server", "--port", port, "--slaveof", "127.0.0.1", slave)
	if false {
		cmd.Stdout = os.Stdout
		cmd.Stderr = os.Stderr
	}
	if err := cmd.Start(); err != nil {
		return nil, err
	}
	return cmd, nil
}

func startRedisSentinel(port, masterName, masterPort string) (*exec.Cmd, error) {
	dir, err := ioutil.TempDir("", "sentinel")
	if err != nil {
		return nil, err
	}

	sentinelConfFilepath := filepath.Join(dir, "sentinel.conf")
	tpl, err := template.New("sentinel.conf").Parse(sentinelConf)
	if err != nil {
		return nil, err
	}

	data := struct {
		Port       string
		MasterName string
		MasterPort string
	}{
		Port:       port,
		MasterName: masterName,
		MasterPort: masterPort,
	}
	if err := writeTemplateToFile(sentinelConfFilepath, tpl, data); err != nil {
		return nil, err
	}

	cmd := exec.Command("redis-server", sentinelConfFilepath, "--sentinel")
	if true {
		cmd.Stdout = os.Stdout
		cmd.Stderr = os.Stderr
	}
	if err := cmd.Start(); err != nil {
		return nil, err
	}

	return cmd, nil
}

func writeTemplateToFile(path string, t *template.Template, data interface{}) error {
	f, err := os.Create(path)
	if err != nil {
		return err
	}
	defer f.Close()
	return t.Execute(f, data)
}

func TestSentinel(t *testing.T) {
	masterName := "mymaster"
	masterPort := "8123"
	slavePort := "8124"
	sentinelPort := "8125"

	masterCmd, err := startRedis(masterPort)
	if err != nil {
		t.Fatal(err)
	}
	defer masterCmd.Process.Kill()

	// Wait for master to start.
	time.Sleep(200 * time.Millisecond)

	master := redis.NewTCPClient(&redis.Options{
		Addr: ":" + masterPort,
	})
	if err := master.Ping().Err(); err != nil {
		t.Fatal(err)
	}

	slaveCmd, err := startRedisSlave(slavePort, masterPort)
	if err != nil {
		t.Fatal(err)
	}
	defer slaveCmd.Process.Kill()

	// Wait for slave to start.
	time.Sleep(200 * time.Millisecond)

	slave := redis.NewTCPClient(&redis.Options{
		Addr: ":" + slavePort,
	})
	if err := slave.Ping().Err(); err != nil {
		t.Fatal(err)
	}

	sentinelCmd, err := startRedisSentinel(sentinelPort, masterName, masterPort)
	if err != nil {
		t.Fatal(err)
	}
	defer sentinelCmd.Process.Kill()

	// Wait for sentinel to start.
	time.Sleep(200 * time.Millisecond)

	sentinel := redis.NewTCPClient(&redis.Options{
		Addr: ":" + sentinelPort,
	})
	if err := sentinel.Ping().Err(); err != nil {
		t.Fatal(err)
	}
	defer sentinel.Shutdown()

	client := redis.NewFailoverClient(&redis.FailoverOptions{
		MasterName:    masterName,
		SentinelAddrs: []string{":" + sentinelPort},
	})

	if err := client.Set("foo", "master").Err(); err != nil {
		t.Fatal(err)
	}

	val, err := master.Get("foo").Result()
	if err != nil {
		t.Fatal(err)
	}
	if val != "master" {
		t.Fatalf(`got %q, expected "master"`, val)
	}

	// Kill Redis master.
	if err := masterCmd.Process.Kill(); err != nil {
		t.Fatal(err)
	}
	if err := master.Ping().Err(); err == nil {
		t.Fatalf("master was not killed")
	}

	// Wait for Redis sentinel to elect new master.
	time.Sleep(5 * time.Second)

	// Check that client picked up new master.
	val, err = client.Get("foo").Result()
	if err != nil {
		t.Fatal(err)
	}
	if val != "master" {
		t.Fatalf(`got %q, expected "master"`, val)
	}
}

var sentinelConf = `
port {{ .Port }}

sentinel monitor {{ .MasterName }} 127.0.0.1 {{ .MasterPort }} 1
sentinel down-after-milliseconds {{ .MasterName }} 1000
sentinel failover-timeout {{ .MasterName }} 2000
sentinel parallel-syncs {{ .MasterName }} 1
`