func gatherInfoOutput()

in plugins/inputs/redis/redis.go [376:493]
93 lines of code
26 McCabe index (conditional complexity)

func gatherInfoOutput(
	rdr io.Reader,
	acc telegraf.Accumulator,
	tags map[string]string,
) error {
	var section string
	var keyspaceHits, keyspaceMisses int64

	scanner := bufio.NewScanner(rdr)
	fields := make(map[string]interface{})
	for scanner.Scan() {
		line := scanner.Text()

		if len(line) == 0 {
			continue
		}

		if line[0] == '#' {
			if len(line) > 2 {
				section = line[2:]
			}
			continue
		}

		parts := strings.SplitN(line, ":", 2)
		if len(parts) < 2 {
			continue
		}
		name := parts[0]

		if section == "Server" {
			if name != "lru_clock" && name != "uptime_in_seconds" && name != "redis_version" {
				continue
			}
		}

		if strings.HasPrefix(name, "master_replid") {
			continue
		}

		if name == "mem_allocator" {
			continue
		}

		if strings.HasSuffix(name, "_human") {
			continue
		}

		metric, ok := Tracking[name]
		if !ok {
			if section == "Keyspace" {
				kline := strings.TrimSpace(parts[1])
				gatherKeyspaceLine(name, kline, acc, tags)
				continue
			}
			if section == "Commandstats" {
				kline := strings.TrimSpace(parts[1])
				gatherCommandstateLine(name, kline, acc, tags)
				continue
			}
			if section == "Replication" && replicationSlaveMetricPrefix.MatchString(name) {
				kline := strings.TrimSpace(parts[1])
				gatherReplicationLine(name, kline, acc, tags)
				continue
			}

			metric = name
		}

		val := strings.TrimSpace(parts[1])

		// Some percentage values have a "%" suffix that we need to get rid of before int/float conversion
		val = strings.TrimSuffix(val, "%")

		// Try parsing as int
		if ival, err := strconv.ParseInt(val, 10, 64); err == nil {
			switch name {
			case "keyspace_hits":
				keyspaceHits = ival
			case "keyspace_misses":
				keyspaceMisses = ival
			case "rdb_last_save_time":
				// influxdb can't calculate this, so we have to do it
				fields["rdb_last_save_time_elapsed"] = time.Now().Unix() - ival
			}
			fields[metric] = ival
			continue
		}

		// Try parsing as a float
		if fval, err := strconv.ParseFloat(val, 64); err == nil {
			fields[metric] = fval
			continue
		}

		// Treat it as a string

		if name == "role" {
			tags["replication_role"] = val
			continue
		}

		fields[metric] = val
	}
	var keyspaceHitrate float64
	if keyspaceHits != 0 || keyspaceMisses != 0 {
		keyspaceHitrate = float64(keyspaceHits) / float64(keyspaceHits+keyspaceMisses)
	}
	fields["keyspace_hitrate"] = keyspaceHitrate

	o := RedisFieldTypes{}

	setStructFieldsFromObject(fields, &o)
	setExistingFieldsFromStruct(fields, &o)

	acc.AddFields("redis", fields, tags)
	return nil
}