More tests, glueing things together, breaking import cycle

Signed-off-by: Jirka Kremser <jiri.kremser@gmail.com>

examples/so.yaml

@@ -11,8 +11,15 @@ spec:
     - type: external
       metadata:
         scalerAddress: keda-otel-scaler:4318
+
+        # required
         metricQuery: "sum(http/server/request_count{app_id=nodeapp, method=GET, path=/v1.0/state/statestore})"
+
+        # optional - default no limit
         clampMin: 1
+
+        # optional - default no limit
         clampMax: 10
-        operationOverTime: last_one/rate/count/average/min/max
-        overTimePeriodSeconds: 60
+
+        # optional - default 'last_one', available values: last_one,rate,count,avg,min,max
+        operationOverTime: last_one

main.go

@@ -29,6 +29,7 @@ import (
 	"github.com/kedify/otel-add-on/metric"
 	"github.com/kedify/otel-add-on/receiver"
 	"github.com/kedify/otel-add-on/scaler"
+	"github.com/kedify/otel-add-on/types"
 
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/health"
@@ -187,8 +188,8 @@ func startGrpcServer(
 	ctx context.Context,
 	cfg *scaler.Config,
 	lggr logr.Logger,
-	ms metric.MemStore,
-	mp metric.Parser,
+	ms types.MemStore,
+	mp types.Parser,
 	port int,
 	targetPendingRequests int64,
 ) error {

metric/mem_store.go

@@ -9,21 +9,22 @@ import (
 
 	"go.opentelemetry.io/collector/pdata/pcommon"
 
+	"github.com/kedify/otel-add-on/types"
 	"github.com/kedify/otel-add-on/util"
 )
 
 type ms struct {
-	store              map[MetricName]StoredMetrics
+	store              map[types.MetricName]types.StoredMetrics
 	stalePeriodSeconds int
 }
 
-func (m ms) Get(name MetricName, searchLabels Labels, timeOp OperationOverTime, defaultAggregation AggregationOverVectors) (float64, Found, error) {
+func (m ms) Get(name types.MetricName, searchLabels types.Labels, timeOp types.OperationOverTime, defaultAggregation types.AggregationOverVectors) (float64, types.Found, error) {
 	now := time.Now().Unix()
 	if _, found := m.store[name]; !found {
 		// not found
 		return -1., false, nil
 	}
-	if err := checkTimeOp(timeOp); err != nil {
+	if err := util.CheckTimeOp(timeOp); err != nil {
 		return -1., false, err
 	}
 	if err := checkDefaultAggregation(defaultAggregation); err != nil {
@@ -66,27 +67,18 @@ func (m ms) Get(name MetricName, searchLabels Labels, timeOp OperationOverTime,
 	return accumulator, true, nil
 }
 
-func checkDefaultAggregation(aggregation AggregationOverVectors) error {
+func checkDefaultAggregation(aggregation types.AggregationOverVectors) error {
 	switch aggregation {
-	case VecSum, VecAvg, VecMin, VecMax:
+	case types.VecSum, types.VecAvg, types.VecMin, types.VecMax:
 		return nil
 	default:
 		return fmt.Errorf("unknown AggregationOverVectors:%s", aggregation)
 	}
 }
 
-func checkTimeOp(op OperationOverTime) error {
-	switch op {
-	case OpLastOne, OpRate, OpCount, OpAvg, OpMin, OpMax:
-		return nil
-	default:
-		return fmt.Errorf("unknown OperationOverTime:%s", op)
-	}
-}
-
-func (m ms) Put(entry NewMetricEntry) {
+func (m ms) Put(entry types.NewMetricEntry) {
 	if _, found := m.store[entry.Name]; !found {
-		m.store[entry.Name] = make(map[LabelsHash]MetricData)
+		m.store[entry.Name] = make(map[types.LabelsHash]types.MetricData)
 	}
 	now := time.Now().Unix()
 	labelsH := hashOfMap(entry.Labels)
@@ -96,11 +88,11 @@ func (m ms) Put(entry NewMetricEntry) {
 	} else {
 		// found
 		md := m.store[entry.Name][labelsH]
-		notStale := util.Filter(md.Data, func(val ObservedValue) bool {
+		notStale := util.Filter(md.Data, func(val types.ObservedValue) bool {
 			return !m.isStale(val.Time, now)
 		})
 		fmt.Sprintf("not stale: %v", notStale)
-		md.Data = append(notStale, ObservedValue{
+		md.Data = append(notStale, types.ObservedValue{
 			Time:  entry.Time,
 			Value: entry.Value,
 		})
@@ -110,14 +102,14 @@ func (m ms) Put(entry NewMetricEntry) {
 	}
 }
 
-func NewMetricStore(stalePeriodSeconds int) MemStore {
+func NewMetricStore(stalePeriodSeconds int) types.MemStore {
 	return ms{
-		store:              make(map[MetricName]StoredMetrics),
+		store:              make(map[types.MetricName]types.StoredMetrics),
 		stalePeriodSeconds: stalePeriodSeconds,
 	}
 }
 
-func hashOfMap(m Labels) LabelsHash {
+func hashOfMap(m types.Labels) types.LabelsHash {
 	h := sha256.New()
 	keys := make([]string, len(m))
 	i := 0
@@ -133,66 +125,66 @@ func hashOfMap(m Labels) LabelsHash {
 		b = sha256.Sum256([]byte(fmt.Sprintf("%v", v)))
 		h.Write(b[:])
 	}
-	return LabelsHash(fmt.Sprintf("%x", h.Sum(nil)))
+	return types.LabelsHash(fmt.Sprintf("%x", h.Sum(nil)))
 }
 
 func (m ms) isStale(datapoint pcommon.Timestamp, now int64) bool {
 	return now-int64(m.stalePeriodSeconds) > int64(datapoint)
 }
 
-func (m ms) calculateAggregate(value float64, counter int, accumulator float64, aggregation AggregationOverVectors) float64 {
+func (m ms) calculateAggregate(value float64, counter int, accumulator float64, aggregation types.AggregationOverVectors) float64 {
 	if counter == 1 {
 		return value
 	}
 	switch aggregation {
-	case VecSum:
+	case types.VecSum:
 		return accumulator + value
-	case VecAvg:
+	case types.VecAvg:
 		// calculate the avg on the fly to avoid potential overflows,
 		// idea: each number adds 1/count of itself to the final result
 		c := float64(counter)
 		cMinusOne := float64(counter - 1)
 		return ((accumulator / c) * cMinusOne) + (value / c)
-	case VecMin:
+	case types.VecMin:
 		return math.Min(accumulator, value)
-	case VecMax:
+	case types.VecMax:
 		return math.Max(accumulator, value)
 	default:
 		panic("unknown aggregation function: " + aggregation)
 	}
 }
 
-func newMetricDatapoint(entry NewMetricEntry) MetricData {
-	return MetricData{
+func newMetricDatapoint(entry types.NewMetricEntry) types.MetricData {
+	return types.MetricData{
 		Labels:     entry.Labels,
 		LastUpdate: entry.Time,
-		Data: []ObservedValue{
+		Data: []types.ObservedValue{
 			{
 				Time:  entry.Time,
 				Value: entry.Value,
 			},
 		},
-		AggregatesOverTime: map[OperationOverTime]float64{
-			OpMin:     entry.Value,
-			OpMax:     entry.Value,
-			OpAvg:     entry.Value,
-			OpLastOne: entry.Value,
-			OpCount:   1,
-			OpRate:    0,
+		AggregatesOverTime: map[types.OperationOverTime]float64{
+			types.OpMin:     entry.Value,
+			types.OpMax:     entry.Value,
+			types.OpAvg:     entry.Value,
+			types.OpLastOne: entry.Value,
+			types.OpCount:   1,
+			types.OpRate:    0,
 		},
 	}
 }
 
-func (m ms) updateAggregatesOverTime(md MetricData) {
+func (m ms) updateAggregatesOverTime(md types.MetricData) {
 	for i := 0; i < len(md.Data); i++ {
-		for _, op := range []OperationOverTime{OpMin, OpMax, OpAvg} {
-			md.AggregatesOverTime[op] = m.calculateAggregate(md.Data[i].Value, i+1, md.AggregatesOverTime[op], AggregationOverVectors(op))
+		for _, op := range []types.OperationOverTime{types.OpMin, types.OpMax, types.OpAvg} {
+			md.AggregatesOverTime[op] = m.calculateAggregate(md.Data[i].Value, i+1, md.AggregatesOverTime[op], types.AggregationOverVectors(op))
 		}
 	}
-	md.AggregatesOverTime[OpRate] = (md.Data[len(md.Data)-1].Value - md.Data[0].Value) / float64(md.Data[len(md.Data)-1].Time-md.Data[0].Time)
-	md.AggregatesOverTime[OpCount] = float64(len(md.Data))
-	md.AggregatesOverTime[OpLastOne] = md.Data[len(md.Data)-1].Value
+	md.AggregatesOverTime[types.OpRate] = (md.Data[len(md.Data)-1].Value - md.Data[0].Value) / float64(md.Data[len(md.Data)-1].Time-md.Data[0].Time)
+	md.AggregatesOverTime[types.OpCount] = float64(len(md.Data))
+	md.AggregatesOverTime[types.OpLastOne] = md.Data[len(md.Data)-1].Value
 }
 
 // enforce iface impl
-var _ MemStore = new(ms)
+var _ types.MemStore = new(ms)