Better redis process abstraction

redis_test.go

@@ -2,6 +2,8 @@ package redis_test
 
 import (
 	"net"
+	"os"
+	"os/exec"
 	"sort"
 	"testing"
 	"time"
@@ -128,6 +130,78 @@ func sortStrings(slice []string) []string {
 	return slice
 }
 
+func execCmd(name string, args ...string) (*os.Process, error) {
+	cmd := exec.Command(name, args...)
+	if false {
+		cmd.Stdout = os.Stdout
+		cmd.Stderr = os.Stderr
+	}
+	return cmd.Process, cmd.Start()
+}
+
+func connectTo(port string) (client *redis.Client, err error) {
+	client = redis.NewTCPClient(&redis.Options{
+		Addr: ":" + port,
+	})
+
+	deadline := time.Now().Add(time.Second)
+	for time.Now().Before(deadline) {
+		if err = client.Ping().Err(); err == nil {
+			break
+		}
+		time.Sleep(100 * time.Millisecond)
+	}
+	return
+}
+
+type redisProcess struct {
+	*os.Process
+	*redis.Client
+}
+
+func (p *redisProcess) Close() error {
+	p.Client.Close()
+	return p.Kill()
+}
+
+func startRedis(port string, args ...string) (*redisProcess, error) {
+	process, err := execCmd("redis-server", append([]string{"--port", port}, args...)...)
+	if err != nil {
+		return nil, err
+	}
+	client, err := connectTo(port)
+	if err != nil {
+		process.Kill()
+		return nil, err
+	}
+	return &redisProcess{process, client}, err
+}
+
+func startSentinel(port, masterName, masterPort string) (*redisProcess, error) {
+	process, err := execCmd("redis-server", os.DevNull, "--sentinel", "--port", port)
+	if err != nil {
+		return nil, err
+	}
+	client, err := connectTo(port)
+	if err != nil {
+		process.Kill()
+		return nil, err
+	}
+	for _, cmd := range []*redis.StatusCmd{
+		redis.NewStatusCmd("SENTINEL", "MONITOR", masterName, "127.0.0.1", masterPort, "1"),
+		redis.NewStatusCmd("SENTINEL", "SET", masterName, "down-after-milliseconds", "500"),
+		redis.NewStatusCmd("SENTINEL", "SET", masterName, "failover-timeout", "1000"),
+		redis.NewStatusCmd("SENTINEL", "SET", masterName, "parallel-syncs", "1"),
+	} {
+		client.Process(cmd)
+		if err := cmd.Err(); err != nil {
+			process.Kill()
+			return nil, err
+		}
+	}
+	return &redisProcess{process, client}, err
+}
+
 //------------------------------------------------------------------------------
 
 func BenchmarkRedisPing(b *testing.B) {

sentinel_test.go

@@ -1,11 +1,6 @@
 package redis_test
 
 import (
-	"io/ioutil"
-	"os"
-	"os/exec"
-	"path/filepath"
-
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 	"gopkg.in/redis.v2"
@@ -16,69 +11,23 @@ var _ = Describe("Sentinel", func() {
 	const masterName = "mymaster"
 	const masterPort = "8123"
 	const sentinelPort = "8124"
-	const sentinelConf = `
-port ` + sentinelPort + `
-
-sentinel monitor ` + masterName + ` 127.0.0.1 ` + masterPort + ` 1
-sentinel down-after-milliseconds ` + masterName + ` 400
-sentinel failover-timeout ` + masterName + ` 800
-sentinel parallel-syncs ` + masterName + ` 1
-`
-
-	var runCmd = func(name string, args ...string) *os.Process {
-		cmd := exec.Command(name, args...)
-		if false {
-			cmd.Stdout = os.Stdout
-			cmd.Stderr = os.Stderr
-		}
-		err := cmd.Start()
-		Expect(err).NotTo(HaveOccurred())
-		return cmd.Process
-	}
-
-	var connect = func(port string) *redis.Client {
-		client := redis.NewTCPClient(&redis.Options{
-			Addr: ":" + port,
-		})
-		Eventually(func() error {
-			return client.Ping().Err()
-		}, "1s", "100ms").ShouldNot(HaveOccurred())
-		return client
-	}
-
-	var startMaster = func() (*redis.Client, *os.Process) {
-		proc := runCmd("redis-server", "--port", masterPort)
-		return connect(masterPort), proc
-	}
-
-	var startSlave = func(port string) (*redis.Client, *os.Process) {
-		proc := runCmd("redis-server", "--port", port, "--slaveof", "127.0.0.1", masterPort)
-		return connect(port), proc
-	}
-
-	var startSentinel = func() *os.Process {
-		dir, err := ioutil.TempDir("", "sentinel")
-		Expect(err).NotTo(HaveOccurred())
-
-		fname := filepath.Join(dir, "sentinel.conf")
-		err = ioutil.WriteFile(fname, []byte(sentinelConf), 0664)
-		Expect(err).NotTo(HaveOccurred())
-
-		proc := runCmd("redis-server", fname, "--sentinel")
-		client := connect(sentinelPort)
-		client.Close()
-		return proc
-	}
 
 	It("should facilitate failover", func() {
-		master, mproc := startMaster()
-		defer mproc.Kill()
-		slave1, sproc1 := startSlave("8125")
-		defer sproc1.Kill()
-		slave2, sproc2 := startSlave("8126")
-		defer sproc2.Kill()
-		sntproc := startSentinel()
-		defer sntproc.Kill()
+		master, err := startRedis(masterPort)
+		Expect(err).NotTo(HaveOccurred())
+		defer master.Close()
+
+		sentinel, err := startSentinel(sentinelPort, masterName, masterPort)
+		Expect(err).NotTo(HaveOccurred())
+		defer sentinel.Close()
+
+		slave1, err := startRedis("8125", "--slaveof", "127.0.0.1", masterPort)
+		Expect(err).NotTo(HaveOccurred())
+		defer slave1.Close()
+
+		slave2, err := startRedis("8126", "--slaveof", "127.0.0.1", masterPort)
+		Expect(err).NotTo(HaveOccurred())
+		defer slave2.Close()
 
 		client := redis.NewFailoverClient(&redis.FailoverOptions{
 			MasterName:    masterName,
@@ -87,7 +36,7 @@ sentinel parallel-syncs ` + masterName + ` 1
 		defer client.Close()
 
 		// Set value on master, verify
-		err := client.Set("foo", "master").Err()
+		err = client.Set("foo", "master").Err()
 		Expect(err).NotTo(HaveOccurred())
 
 		val, err := master.Get("foo").Result()