Golang Conn.Send方法代碼示例

// Decrements all jobs' score by one
func (q *delayedQueue) TickTock(conn redis.Conn) error {
	// if ticktock is running, don't run another one
	if q.isTicking {
		return nil
	}

	q.isTicking = true

	// there are multiple returns, but whichever return
	// gets hit, make sure isTicking is switched off
	defer func() {
		q.isTicking = false
	}()

	// get all job ids
	//
	// NOTE: loading all ids into memory might be an overhead
	// if the set is big, ZSCAN might be able to help on this
	idToScore := GetQueueScores(q.GetIndexName(), conn)

	// decrement each job's score
	conn.Send("MULTI")
	for id, score := range idToScore {
		// only decrement scores > zero so we
		// don't ran into negative scores
		if score > 0 {
			conn.Send("ZINCRBY", q.GetIndexName(), -1, id)
		}
	}
	if _, err := conn.Do("EXEC"); err != nil {
		return err
	}

	return nil
}

// check - lock - check
func (provider *RedisProvider) startSession(sid string, conn redis.Conn, option *Options) (Sessioner, bool, error) {
	// 檢查隨機生成的session是否被占用了
	if exist, err := redis.Bool(conn.Do("EXISTS", getRedisKey(sid))); exist || err != nil {
		return nil, false, err
	}
	// 觀察sid
	conn.Send("WATCH", getRedisKey(sid))
	conn.Send("MULTI")
	conn.Send("HSET", getRedisKey(sid), "createtime", time.Now().Unix())
	if option.Cookielifttime > 0 {
		conn.Send("EXPIRE", getRedisKey(sid), option.Cookielifttime)
	} else {
		conn.Send("EXPIRE", getRedisKey(sid), 30*24*60*60)
	}

	replay, err := conn.Do("EXEC")
	if err != nil {
		return nil, false, err
	}
	if replay == nil {
		return nil, false, nil
	}
	sessioner, err := provider.GetSessioner(sid)
	return sessioner, true, err
}

func createShortURL(url string, conn redis.Conn) (Data, error) {
	var d Data
	count, err := redis.Int(conn.Do("INCR", "global:size"))
	if err != nil {
		log.Print(err)
		return d, err
	}
	log.Print("Total: ", count)
	encodedVar := base62.EncodeInt(int64(count))
	key := strings.Join([]string{encodedVar, url}, "||")
	conn.Send("MULTI")
	conn.Send("HSET", key, "count", 0)
	_, err2 := conn.Do("EXEC")

	if err2 != nil {
		log.Print(err2)
		return d, err2
	}

	d.Original = url
	d.HitCount = 0
	d.Short = encodedVar
	d.FullShort = strings.Join([]string{*base, encodedVar}, "")

	return d, err
}

// Checking rate limit 10 request / 1 sec.
func checkRateLimit(con redis.Conn, c *echo.Context) bool {
	ip, _, err := net.SplitHostPort(c.Request().RemoteAddr)
	if err != nil {
		panic(err)
	}

	//If list of ip address's length is 10 retun false.
	current, err := redis.Int(con.Do("LLEN", ip))
	if err == nil && current > 10 {
		return false
	}
	exists, err := redis.Bool(con.Do("EXISTS", ip))
	if err != nil {
		panic(err)
	}
	if !exists {
		con.Send("MULTI")
		con.Send("RPUSH", ip, ip)
		con.Send("EXPIRE", ip, 1)
		_, err := con.Do("EXEC")
		if err != nil {
			panic(err)
		}
	} else {
		_, err := con.Do("RPUSHX", ip, ip)
		if err != nil {
			panic(err)
		}
	}
	return true
}

func Get(conn redis.Conn) string {

	conn.Send("GET", "fooo")
	conn.Flush()

	result, _ := redis.String(conn.Receive()) // TODO missing two err catch

	return result
}

func Save(obj interface{}, conn redis.Conn) reflect.Type {

	conn.Send("GET", "fooo")
	conn.Flush()

	//result, _ := redis.String(conn.Receive()) // TODO missing two err catch

	return reflect.ValueOf(&obj).Type()

}

func writeBatch(list string, conn redis.Conn, values []string) {
	conn.Send("MULTI")
	for _, value := range values {
		value = strings.TrimSpace(value)
		if value != "" {
			conn.Send("LPUSH", list, value)
		}
	}
	_, err := redis.Values(conn.Do("EXEC"))
	if err != nil {
		log.Fatalf("Could not LPUSH: %s \"%s\"\n", list, err.Error())
	}
}

func recordHitAtGranularity( granularity Granularity, time float64, key string, c redis.Conn ) bool{
	size := granularity.size
	factor := granularity.factor
	ttl := granularity.ttl
	name := granularity.name
	tsround := getRoundedTimestamp(time, size * factor)
	s := []string{"stats",key,name,strconv.FormatFloat(tsround, 'f', 0, 64)}
	redis_key := strings.Join(s,":")
	ts := strconv.FormatFloat(getFactoredTimestamp (time, factor), 'f', 0, 64)    	
	ttl_str := strconv.FormatFloat(tsround+ttl, 'f', 0, 64)
	c.Send("HINCRBY", redis_key, ts, 1)	
	c.Send("EXPIREAT", redis_key, ttl_str)	
	return true;
}

func publishEventsPipeline(conn redis.Conn, command string) publishFn {
	return func(key outil.Selector, data []outputs.Data) ([]outputs.Data, error) {
		var okEvents []outputs.Data
		serialized := make([]interface{}, 0, len(data))
		okEvents, serialized = serializeEvents(serialized, 0, data)
		if len(serialized) == 0 {
			return nil, nil
		}

		data = okEvents[:0]
		for i, serializedEvent := range serialized {
			eventKey, err := key.Select(okEvents[i].Event)
			if err != nil {
				logp.Err("Failed to set redis key: %v", err)
				continue
			}

			data = append(data, okEvents[i])
			if err := conn.Send(command, eventKey, serializedEvent); err != nil {
				logp.Err("Failed to execute %v: %v", command, err)
				return okEvents, err
			}
		}

		if err := conn.Flush(); err != nil {
			return data, err
		}

		failed := data[:0]
		var lastErr error
		for i := range serialized {
			_, err := conn.Receive()
			if err != nil {
				if _, ok := err.(redis.Error); ok {
					logp.Err("Failed to %v event to list with %v",
						command, err)
					failed = append(failed, data[i])
					lastErr = err
				} else {
					logp.Err("Failed to %v multiple events to list with %v",
						command, err)
					failed = append(failed, data[i:]...)
					lastErr = err
					break
				}
			}
		}
		return failed, lastErr
	}
}

func (b *BGPDump) parseBGPCSV(r io.Reader, conn redis.Conn) (int, error) {
	day := b.day()
	s := bufio.NewScanner(r)
	n := 0
	var asn string
	for s.Scan() {
		cols := strings.Split(s.Text(), "|")
		if len(cols) < 7 {
			return n, ParseError{
				Message: "too few columns",
				Path:    filepath.Base(b.Path()),
				LineNum: n,
				Line:    s.Text(),
			}
		}
		block := cols[5]

		if _, ok := asn12654blocks[block]; ok {
			asn = "12654"
		} else {
			asPath := cols[6]
			asns := strings.Split(asPath, " ")
			asn = asns[len(asns)-1]
			if asn == "" {
				return n, ParseError{
					Message: "no ASPATH data",
					Path:    filepath.Base(b.Path()),
					LineNum: n,
					Line:    s.Text(),
				}
			}
		}
		conn.Send("HSET", fmt.Sprintf("i2a:%s", block), day, asn)
		n++
		if n%10000 == 0 {
			err := conn.Flush()
			if err != nil {
				return 0, err
			}
		}
	}
	conn.Send("SADD", "i2a:imported_dates", day)
	err := conn.Flush()
	if err != nil {
		return 0, err
	}
	return n, nil
}

func read(list string, conn redis.Conn, count int) {
	for i := 0; i < count; i++ {
		conn.Send("LPOP", list)
	}
	conn.Flush()
	for i := 0; i < count; i++ {
		value, err := redis.String(conn.Receive())

		if err != nil {
			os.Exit(0)
		}
		if value != "" {
			fmt.Println(value)
		}
	}
}

func pipelineScore(conn redis.Conn, keyMembers []common.KeyMember) (map[common.KeyMember]Presence, error) {
	for _, keyMember := range keyMembers {
		if err := conn.Send("ZSCORE", keyMember.Key+insertSuffix, keyMember.Member); err != nil {
			return map[common.KeyMember]Presence{}, err
		}
		if err := conn.Send("ZSCORE", keyMember.Key+deleteSuffix, keyMember.Member); err != nil {
			return map[common.KeyMember]Presence{}, err
		}
	}
	if err := conn.Flush(); err != nil {
		return map[common.KeyMember]Presence{}, err
	}

	m := map[common.KeyMember]Presence{}
	for i := 0; i < len(keyMembers); i++ {
		insertReply, insertErr := conn.Receive()
		insertValue, insertErr := redis.Float64(insertReply, insertErr)
		deleteReply, deleteErr := conn.Receive()
		deleteValue, deleteErr := redis.Float64(deleteReply, deleteErr)
		switch {
		case insertErr == nil && deleteErr == redis.ErrNil:
			m[keyMembers[i]] = Presence{
				Present:  true,
				Inserted: true,
				Score:    insertValue,
			}
		case insertErr == redis.ErrNil && deleteErr == nil:
			m[keyMembers[i]] = Presence{
				Present:  true,
				Inserted: false,
				Score:    deleteValue,
			}
		case insertErr == redis.ErrNil && deleteErr == redis.ErrNil:
			m[keyMembers[i]] = Presence{
				Present: false,
			}
		default:
			return map[common.KeyMember]Presence{}, fmt.Errorf(
				"pipelineScore bad state for %v (%v/%v)",
				keyMembers[i],
				insertErr,
				deleteErr,
			)
		}
	}
	return m, nil
}

func (w *worker) start(conn redis.Conn, job *job) error {
	work := &work{
		Queue:   job.Queue,
		RunAt:   time.Now(),
		Payload: job.Payload,
	}

	buffer, err := json.Marshal(work)
	if err != nil {
		return err
	}

	conn.Send("SET", fmt.Sprintf("%sworker:%s", namespace, w), buffer)
	logger.Debugf("Processing %s since %s [%v]", work.Queue, work.RunAt, work.Payload.Class)

	return w.process.start(conn)
}

func (w *worker) fail(conn redis.Conn, job *job, err error) error {
	failure := &failure{
		FailedAt:  time.Now(),
		Payload:   job.Payload,
		Exception: "Error",
		Error:     err.Error(),
		Worker:    w,
		Queue:     job.Queue,
	}
	buffer, err := json.Marshal(failure)
	if err != nil {
		return err
	}
	conn.Send("RPUSH", fmt.Sprintf("%sfailed", namespace), buffer)

	return w.process.fail(conn)
}

func pipelineRange(conn redis.Conn, keys []string, offset, limit int) (map[string][]common.KeyScoreMember, error) {
	if limit < 0 {
		return map[string][]common.KeyScoreMember{}, fmt.Errorf("negative limit is invalid for offset-based select")
	}
	for _, key := range keys {
		if err := conn.Send(
			"ZREVRANGE",
			key+insertSuffix,
			offset,
			offset+limit-1,
			"WITHSCORES",
		); err != nil {
			return map[string][]common.KeyScoreMember{}, err
		}
	}

	if err := conn.Flush(); err != nil {
		return map[string][]common.KeyScoreMember{}, err
	}

	m := make(map[string][]common.KeyScoreMember, len(keys))

	for _, key := range keys {
		values, err := redis.Values(conn.Receive())
		if err != nil {
			return map[string][]common.KeyScoreMember{}, err
		}

		var (
			ksm             = common.KeyScoreMember{Key: key}
			keyScoreMembers = make([]common.KeyScoreMember, 0, len(values))
		)

		for len(values) > 0 {
			if values, err = redis.Scan(values, &ksm.Member, &ksm.Score); err != nil {
				return map[string][]common.KeyScoreMember{}, err
			}

			keyScoreMembers = append(keyScoreMembers, ksm)
		}

		m[key] = keyScoreMembers
	}

	return m, nil
}