func ExampleNewFailoverClient() {
client := redis.NewFailoverClient(&redis.FailoverOptions{
MasterName: "master",
SentinelAddrs: []string{":26379"},
})
pong, err := client.Ping().Result()
fmt.Println(pong, err)
// Output: PONG <nil>
}
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)
}
}