Golang Client.Cmd方法代碼示例

func (u *Universe) SpawnAsteroid(redis_client *redis.Client) {
	if rand.Float32() < 0.1 {
		live_asteroids := redis_client.Cmd("KEYS", "asteroid-*")
		num_asteroids := 1000
		if len(live_asteroids.Elems) < num_asteroids {

			temp_asteroid := &asteroid.Asteroid{gameobject.GameObject{
				Id:   rand.Intn(500000),
				X:    rand.Float64(),
				Y:    rand.Float64(),
				Velx: rand.Float64() * 100,
				Vely: rand.Float64() * 100},
				100}

			u.Asteroids = append(u.Asteroids, temp_asteroid)
			asteroid_json, _ := json.Marshal(temp_asteroid)

			redis_client.Cmd("SET", fmt.Sprintf("asteroid-%v", temp_asteroid.Id), asteroid_json)
		}

		// temp_bullet := &bullet.Bullet{gameobject.GameObject{
		//                     Id: rand.Intn(500000),
		//                     X: rand.Float64(),
		//                     Y: rand.Float64(),
		//                     Velx: rand.Float64() * 100,
		//                     Vely: rand.Float64() * 100},
		//                     100}

		// u.Bullets = append(u.Bullets,temp_bullet)

		// redis_client.Cmd("SET", fmt.Sprintf("bullet-%v", temp_bullet.Id), temp_bullet)

	}
}

func insertDocument(domain, title, url, group string, popularity float64, c *redis.Client) {
	encoded := encodeString(domain)
	encodedURL := encodeString(url)

	existingTitle, _ := c.Cmd("HGET", encoded+"$titles", encodedURL).Str()
	if existingTitle == "" {
		err := c.Cmd("HINCRBY", "$domaindocuments", domain, 1).Err
		errorHandler(err)
	}

	pipedCommands := 0
	for _, prefix := range getPrefixes(title) {
		if group != "" {
			encodedGroup := encodeString(group)
			c.Append("ZADD", encoded+encodedGroup+prefix, popularity, encodedURL)
			c.Append("HSET", encoded+"$groups", encodedURL, encodedGroup)
			pipedCommands++
		} else {
			c.Append("ZADD", encoded+prefix, popularity, encodedURL)
		}
		pipedCommands++
	}
	c.Append("HSET", encoded+"$titles", encodedURL, title)
	pipedCommands++
	c.Append("HSET", encoded+"$urls", encodedURL, url)
	pipedCommands++
	for i := 1; i <= pipedCommands; i++ {
		if err := c.GetReply().Err; err != nil {
			errorHandler(err)
		}
	}

}

func authenticateByPassword(c *redis.Client, password string) error {
	if r := c.Cmd("AUTH", password); r.Err != nil {
		logger.Errorf("Faild to authenticate. %s", r.Err)
		return r.Err
	}
	return nil
}

func getRedisInfo(c *redis.Client) (*map[string]string, error) {
	info := make(map[string]string)

	r := c.Cmd("info")
	if r.Err != nil {
		return nil, errors.New("couldn't execute query")
	}
	str, err := r.Str()
	if err != nil {
		return nil, errors.New("couldn't execute query")
	}

	for _, line := range strings.Split(str, "\r\n") {
		if line == "" {
			continue
		}
		if re, _ := regexp.MatchString("^#", line); re {
			continue
		}

		record := strings.SplitN(line, ":", 2)
		if len(record) < 2 {
			continue
		}
		key, value := record[0], record[1]
		info[key] = value
	}

	return &info, nil
}

func fetchPercentageOfMemory(c *redis.Client, stat map[string]float64) error {
	r := c.Cmd("CONFIG", "GET", "maxmemory")
	if r.Err != nil {
		logger.Errorf("Failed to run `CONFIG GET maxmemory` command. %s", r.Err)
		return r.Err
	}

	res, err := r.Hash()
	if err != nil {
		logger.Errorf("Failed to fetch maxmemory. %s", err)
		return err
	}

	maxsize, err := strconv.ParseFloat(res["maxmemory"], 64)
	if err != nil {
		logger.Errorf("Failed to parse maxmemory. %s", err)
		return err
	}

	if maxsize == 0.0 {
		stat["percentage_of_memory"] = 0.0
	} else {
		stat["percentage_of_memory"] = 100.0 * stat["used_memory"] / maxsize
	}

	return nil
}

func getBackend(hostname string, defaultBackendType string, redisClient *redis.Client) (string, error) {
	fmt.Println("Looking up", hostname)

	backends, error := redisClient.Cmd("smembers", "hostnames:"+hostname+":backends").List()
	if error != nil {
		fmt.Println("Error in redis lookup for hostname backend", error)
		return "", error
	}

	if len(backends) == 0 {
		backends, error = redisClient.Cmd("smembers", "hostnames:"+defaultBackendType+":backends").List()
		if error != nil {
			fmt.Println("Error in redis lookup for default backend", error)
			return "", error
		}
		if len(backends) == 0 {
			fmt.Println("No default backend of type", defaultBackendType)
			return "", errors.New("Could not find default backend of type " + defaultBackendType)
		}
	}

	fmt.Println("Found backends:", backends)
	backend := backends[int(rand.Float32()*float32(len(backends)))]
	return backend, nil
}

func list(connection *redis.Client) map[string][]string {
	var blacklisted []string
	var whitelisted []string
	var marked []string

	repsheet := connection.Cmd("KEYS", "*:repsheet:*:*")
	for i := 0; i < len(repsheet.Elems); i++ {
		value, _ := repsheet.Elems[i].Str()
		parts := strings.Split(value, ":")
		repsheetType := parts[len(parts)-1]

		switch repsheetType {
		case "blacklisted":
			blacklisted = append(blacklisted, parts[0])
		case "whitelisted":
			whitelisted = append(whitelisted, parts[0])
		case "marked":
			marked = append(marked, parts[0])
		}
	}

	var list = make(map[string][]string)
	list["blacklisted"] = blacklisted
	list["whitelisted"] = whitelisted
	list["marked"] = marked

	return list
}

func SetRedisValue(redisClient *redis.Client, key string, value string) {
	var reply *redis.Reply = redisClient.Cmd("SET", key, value)

	if reply.Err != nil {
		panic(reply.Err)
	}
}

func storeCacheValues(rascalData []byte, cdnName string, sampleTime int64, cacheGroupMap map[string]string, redisClient *redis.Client) error {
	/* note about the redis data:
	keys are cdnName:deliveryService:cacheGroup:cacheName:statName
	*/

	type CacheStatsJson struct {
		Pp     string `json:"pp"`
		Date   string `json:"date"`
		Caches map[string]map[string][]struct {
			Index uint64 `json:"index"`
			Time  uint64 `json:"time"`
			Value string `json:"value"`
			Span  uint64 `json:"span"`
		} `json:"caches"`
	}

	var jData CacheStatsJson
	err := json.Unmarshal(rascalData, &jData)
	errHndlr(err, ERROR)
	statCount := 0
	statTotals := make(map[string]float64)
	for cacheName, cacheData := range jData.Caches {
		for statName, statData := range cacheData {
			redisKey := cdnName + ":all:" + cacheGroupMap[cacheName] + ":" + cacheName + ":" + statName
			redisKey = strings.Replace(redisKey, ":bandwidth", ":kbps", 1)
			statValue := statData[0].Value
			//fmt.Printf("%s  ->%s\n", redisKey, statValue)
			statCount++
			statFloatValue, err := strconv.ParseFloat(statValue, 64)
			if err != nil {
				statFloatValue = 0.0
			}
			statTotals[cdnName+":all:"+cacheGroupMap[cacheName]+":all:"+statName] += statFloatValue
			statTotals[cdnName+":all:all:all:"+statName] += statFloatValue
			if statName == "maxKbps" {
				r := redisClient.Cmd("zadd", redisKey, sampleTime, statValue) // only care for the last val here.
				errHndlr(r.Err, ERROR)
			} else {
				r := redisClient.Cmd("rpush", redisKey, statValue)
				errHndlr(r.Err, ERROR)
			}
		}
	}
	for totalKey, totalVal := range statTotals {
		totalKey = strings.Replace(totalKey, ":bandwidth", ":kbps", 1)
		if strings.Contains(totalKey, "maxKbps") {
			r := redisClient.Cmd("zadd", totalKey, sampleTime, strconv.FormatFloat(totalVal, 'f', 2, 64))
			errHndlr(r.Err, ERROR)
		} else {
			r := redisClient.Cmd("rpush", totalKey, strconv.FormatFloat(totalVal, 'f', 2, 64))
			errHndlr(r.Err, ERROR)
		}
		statCount++
	}
	r := redisClient.Cmd("rpush", cdnName+":tstamp", sampleTime)
	errHndlr(r.Err, ERROR)
	log.Info("Saved ", statCount, " values for ", cdnName, " @ ", sampleTime)
	return nil
}

func someFunc(c *redis.Client) (err error) {
	reply := c.Cmd("set", "mykey", "myvalue")
	// what is the recommended error
	if reply.Err != nil {
		return reply.Err
	}
	// some code here
	return
}

func search(connection *redis.Client, actor string) bool {
	searchString := fmt.Sprintf("%s:*", actor)
	results := connection.Cmd("KEYS", searchString)

	if len(results.Elems) == 1 {
		return true
	} else {
		return false
	}
}

func GetDomain(key string, conn *redis.Client) (string, error) {
	reply := conn.Cmd("HGET", "$domainkeys", key)
	if reply.Type == redis.NilReply {
		return "", reply.Err
	}
	domain, err := reply.Str()
	if err != nil {
		return "", err
	} else {
		return domain, nil
	}
}

/* the ds json looks like:
{
  "deliveryService": {
    "linear-gbr-hls-sbr": {
      "location.us-ma-woburn.kbps": [{
        "index": 520281,
        "time": 1398893383605,
        "value": "0",
        "span": 520024
      }],
      "location.us-de-newcastle.kbps": [{
        "index": 520281,
        "time": 1398893383605,
        "value": "0",
        "span": 517707
      }],
    }
 }
*/
func storeDsValues(rascalData []byte, cdnName string, sampleTime int64, redisClient *redis.Client, dsAggregate map[string]AggregationConfig) error {
	type DsStatsJson struct {
		Pp              string `json:"pp"`
		Date            string `json:"date"`
		DeliveryService map[string]map[string][]struct {
			Index uint64 `json:"index"`
			Time  uint64 `json:"time"`
			Value string `json:"value"`
			Span  uint64 `json:"span"`
		} `json:"deliveryService"`
	}

	var jData DsStatsJson
	err := json.Unmarshal(rascalData, &jData)
	errHndlr(err, ERROR)
	statCount := 0
	statTotals := make(map[string]float64)
	for dsName, dsData := range jData.DeliveryService {
		for dsMetric, dsMetricData := range dsData {
			keyPart := strings.Replace(dsMetric, "location.", "", -1)
			keyPart = strings.Replace(keyPart, ".kbps", ":all:kbps", -1)
			keyPart = strings.Replace(keyPart, ".tps", ":all:tps", -1)
			keyPart = strings.Replace(keyPart, ".status", ":all:status", -1)
			keyPart = strings.Replace(keyPart, "total:all:", "all:all:", -1) // for consistency all everywhere
			redisKey := cdnName + ":" + dsName + ":" + keyPart
			statValue := dsMetricData[0].Value
			//fmt.Printf("%s  ->%s\n", redisKey, statValue)
			statCount++

			aggConfig, exists := dsAggregate[dsMetric]

			if exists {
				statFloatValue, err := strconv.ParseFloat(statValue, 64)

				if err != nil {
					statFloatValue = 0.0
				}

				statTotals[cdnName+":all:all:all:"+aggConfig.RedisKey] += statFloatValue
			}

			r := redisClient.Cmd("rpush", redisKey, statValue)
			errHndlr(r.Err, ERROR)
		}
	}
	for totalKey, totalVal := range statTotals {
		r := redisClient.Cmd("rpush", totalKey, strconv.FormatFloat(totalVal, 'f', 2, 64))
		errHndlr(r.Err, ERROR)
		statCount++
	}
	log.Info("Saved ", statCount, " ds values for ", cdnName, " @ ", sampleTime)
	return nil
}

// benchmark benchmarks the given command with the given parameters
// and displays the given test name.
func benchmark(c *redis.Client, testname string, command string, params ...interface{}) {
	fmt.Printf("===== %s =====\n", testname)
	start := time.Now()

	for i := 0; i < *requests; i++ {
		c.Cmd(command, params...)
	}

	duration := time.Now().Sub(start)
	rps := float64(*requests) / duration.Seconds()
	fmt.Println("Requests per second:", rps)
	fmt.Printf("Duration: %v\n\n", duration.Seconds())
}

func (u *Universe) InitUniverse(redis_client *redis.Client) {
	live_asteroids := redis_client.Cmd("KEYS", "asteroid-*")

	//load asteroids from db
	u.Asteroids = make([]*asteroid.Asteroid, 0, len(live_asteroids.Elems))
	for key := range live_asteroids.Elems {
		asteroid := &asteroid.Asteroid{}
		temp_asteroid := redis_client.Cmd("GET", live_asteroids.Elems[key])
		if err := json.Unmarshal([]byte(temp_asteroid.String()), &asteroid); err != nil {
		}
		u.Asteroids = append(u.Asteroids, asteroid)
	}
}