Refactoring gauges to support floats, unit tests

accumulator.go

@@ -13,7 +13,7 @@ import (
 // BatchPoints is used to send a batch of data in a single write from telegraf
 // to influx
 type BatchPoints struct {
-	mu sync.Mutex
+	sync.Mutex
 
 	client.BatchPoints
 
@@ -30,8 +30,8 @@ func (bp *BatchPoints) Add(
 	val interface{},
 	tags map[string]string,
 ) {
-	bp.mu.Lock()
-	defer bp.mu.Unlock()
+	bp.Lock()
+	defer bp.Unlock()
 
 	measurement = bp.Prefix + measurement
 
@@ -72,8 +72,8 @@ func (bp *BatchPoints) AddFieldsWithTime(
 	// TODO this function should add the fields with the timestamp, but that will
 	// need to wait for the InfluxDB point precision/unit to be fixed
 	bp.AddFields(measurement, fields, tags)
-	// bp.mu.Lock()
-	// defer bp.mu.Unlock()
+	// bp.Lock()
+	// defer bp.Unlock()
 
 	// measurement = bp.Prefix + measurement
 
@@ -117,8 +117,8 @@ func (bp *BatchPoints) AddFields(
 	fields map[string]interface{},
 	tags map[string]string,
 ) {
-	bp.mu.Lock()
-	defer bp.mu.Unlock()
+	bp.Lock()
+	defer bp.Unlock()
 
 	measurement = bp.Prefix + measurement
 

plugins/statsd/statsd.go

@@ -34,9 +34,9 @@ type Statsd struct {
 	done      chan struct{}
 
 	// Cache gauges, counters & sets so they can be aggregated as they arrive
-	gauges   map[string]cachedmetric
-	counters map[string]cachedmetric
-	sets     map[string]cachedmetric
+	gauges   map[string]cachedgauge
+	counters map[string]cachedcounter
+	sets     map[string]cachedset
 
 	Mappings []struct {
 		Match  string
@@ -52,9 +52,9 @@ func NewStatsd() *Statsd {
 	s.done = make(chan struct{})
 	s.in = make(chan string, s.AllowedPendingMessages)
 	s.inmetrics = make(chan metric, s.AllowedPendingMessages)
-	s.gauges = make(map[string]cachedmetric)
-	s.counters = make(map[string]cachedmetric)
-	s.sets = make(map[string]cachedmetric)
+	s.gauges = make(map[string]cachedgauge)
+	s.counters = make(map[string]cachedcounter)
+	s.sets = make(map[string]cachedset)
 
 	return &s
 }
@@ -63,19 +63,31 @@ func NewStatsd() *Statsd {
 type metric struct {
 	name       string
 	bucket     string
-	value      int64
+	value      float64
 	mtype      string
 	additive   bool
 	samplerate float64
 	tags       map[string]string
 }
 
-// cachedmetric is a subset of metric used specifically for storing cached
-// gauges and counters, ready for sending to InfluxDB.
-type cachedmetric struct {
+type cachedset struct {
+	set  map[int64]bool
+	tags map[string]string
+}
+
+type cachedgauge struct {
+	value float64
+	tags  map[string]string
+}
+
+type cachedcounter struct {
 	value int64
 	tags  map[string]string
-	set   map[int64]bool
+}
+
+type cachedtiming struct {
+	timings []float64
+	tags    map[string]string
 }
 
 func (_ *Statsd) Description() string {
@@ -105,7 +117,6 @@ func (s *Statsd) Gather(acc plugins.Accumulator) error {
 	s.Lock()
 	defer s.Unlock()
 
-	values := make(map[string]int64)
 	items := len(s.inmetrics)
 	for i := 0; i < items; i++ {
 
@@ -123,26 +134,23 @@ func (s *Statsd) Gather(acc plugins.Accumulator) error {
 		acc.Add(name, cmetric.value, cmetric.tags)
 	}
 	if s.DeleteGauges {
-		s.gauges = make(map[string]cachedmetric)
+		s.gauges = make(map[string]cachedgauge)
 	}
 
 	for name, cmetric := range s.counters {
 		acc.Add(name, cmetric.value, cmetric.tags)
 	}
 	if s.DeleteCounters {
-		s.counters = make(map[string]cachedmetric)
+		s.counters = make(map[string]cachedcounter)
 	}
 
 	for name, cmetric := range s.sets {
-		acc.Add(name, cmetric.value, cmetric.tags)
+		acc.Add(name, int64(len(cmetric.set)), cmetric.tags)
 	}
 	if s.DeleteSets {
-		s.sets = make(map[string]cachedmetric)
+		s.sets = make(map[string]cachedset)
 	}
 
-	for name, value := range values {
-		acc.Add(name, value, nil)
-	}
 	return nil
 }
 
@@ -153,9 +161,9 @@ func (s *Statsd) Start() error {
 	s.done = make(chan struct{})
 	s.in = make(chan string, s.AllowedPendingMessages)
 	s.inmetrics = make(chan metric, s.AllowedPendingMessages)
-	s.gauges = make(map[string]cachedmetric)
-	s.counters = make(map[string]cachedmetric)
-	s.sets = make(map[string]cachedmetric)
+	s.gauges = make(map[string]cachedgauge)
+	s.counters = make(map[string]cachedcounter)
+	s.sets = make(map[string]cachedset)
 
 	// Start the UDP listener
 	go s.udpListen()
@@ -267,14 +275,14 @@ func (s *Statsd) parseStatsdLine(line string) error {
 		}
 		m.additive = true
 	}
-	v, err := strconv.ParseInt(parts2[1], 10, 64)
+	v, err := strconv.ParseFloat(parts2[1], 64)
 	if err != nil {
-		log.Printf("Error: parsing value to int64: %s\n", line)
+		log.Printf("Error: parsing value to float64: %s\n", line)
 		return errors.New("Error Parsing statsd line")
 	}
 	// If a sample rate is given with a counter, divide value by the rate
 	if m.samplerate != 0 && m.mtype == "c" {
-		v = int64(float64(v) / m.samplerate)
+		v = v / m.samplerate
 	}
 	m.value = v
 
@@ -301,7 +309,7 @@ func (s *Statsd) parseStatsdLine(line string) error {
 // map of tags.
 // Return values are (<name>, <tags>)
 func (s *Statsd) parseName(m metric) (string, map[string]string) {
-	var tags map[string]string
+	tags := make(map[string]string)
 	name := strings.Replace(m.bucket, ".", "_", -1)
 	name = strings.Replace(name, "-", "__", -1)
 
@@ -325,13 +333,13 @@ func (s *Statsd) parseName(m metric) (string, map[string]string) {
 
 	switch m.mtype {
 	case "c":
-		name = name + "_counter"
+		tags["metric_type"] = "counter"
 	case "g":
-		name = name + "_gauge"
+		tags["metric_type"] = "gauge"
 	case "s":
-		name = name + "_set"
+		tags["metric_type"] = "set"
 	case "ms", "h":
-		name = name + "_timer"
+		tags["metric_type"] = "timer"
 	}
 
 	return name, tags
@@ -361,21 +369,22 @@ func bucketglob(pattern, bucket string) bool {
 func (s *Statsd) aggregate(m metric) {
 	switch m.mtype {
 	case "c":
+		v := int64(m.value)
 		cached, ok := s.counters[m.name]
 		if !ok {
-			s.counters[m.name] = cachedmetric{
-				value: m.value,
+			s.counters[m.name] = cachedcounter{
+				value: v,
 				tags:  m.tags,
 			}
 		} else {
-			cached.value += m.value
+			cached.value += v
 			cached.tags = m.tags
 			s.counters[m.name] = cached
 		}
 	case "g":
 		cached, ok := s.gauges[m.name]
 		if !ok {
-			s.gauges[m.name] = cachedmetric{
+			s.gauges[m.name] = cachedgauge{
 				value: m.value,
 				tags:  m.tags,
 			}
@@ -389,22 +398,17 @@ func (s *Statsd) aggregate(m metric) {
 			s.gauges[m.name] = cached
 		}
 	case "s":
+		v := int64(m.value)
 		cached, ok := s.sets[m.name]
 		if !ok {
 			// Completely new metric (initialize with count of 1)
-			s.sets[m.name] = cachedmetric{
-				value: 1,
-				tags:  m.tags,
-				set:   map[int64]bool{m.value: true},
+			s.sets[m.name] = cachedset{
+				tags: m.tags,
+				set:  map[int64]bool{v: true},
 			}
 		} else {
-			_, ok := s.sets[m.name].set[m.value]
-			if !ok {
-				// Metric exists, but value has not been counted
-				cached.value += 1
-				cached.set[m.value] = true
-				s.sets[m.name] = cached
-			}
+			cached.set[v] = true
+			s.sets[m.name] = cached
 		}
 	}
 }