[receivertest] add metrics support to contract_checker

.chloggen/implement_contract_checker.yaml

@@ -0,0 +1,25 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. otlpreceiver)
+component: receivertest
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: add support for metrics in contract checker
+
+# One or more tracking issues or pull requests related to the change
+issues: [9551]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: [api]

receiver/receivertest/contract_checker.go

@@ -22,6 +22,7 @@ import (
 	"go.opentelemetry.io/collector/consumer/consumererror"
 	"go.opentelemetry.io/collector/pdata/pcommon"
 	"go.opentelemetry.io/collector/pdata/plog"
+	"go.opentelemetry.io/collector/pdata/pmetric"
 	"go.opentelemetry.io/collector/pdata/ptrace"
 	"go.opentelemetry.io/collector/receiver"
 )
@@ -116,8 +117,7 @@ func checkConsumeContractScenario(params CheckConsumeContractParams, decisionFun
 	case component.DataTypeTraces:
 		receiver, err = params.Factory.CreateTracesReceiver(ctx, NewNopCreateSettings(), params.Config, consumer)
 	case component.DataTypeMetrics:
-		// TODO: add metrics support to mockConsumer so that this case can be also implemented.
-		require.FailNow(params.T, "DataTypeMetrics is not implemented")
+		receiver, err = params.Factory.CreateMetricsReceiver(ctx, NewNopCreateSettings(), params.Config, consumer)
 	default:
 		require.FailNow(params.T, "must specify a valid DataType to test for")
 	}
@@ -390,7 +390,76 @@ func idSetFromLogs(data plog.Logs) (idSet, error) {
 	return ds, nil
 }
 
-// TODO: Implement mockConsumer.ConsumeMetrics()
+func (m *mockConsumer) ConsumeMetrics(_ context.Context, data pmetric.Metrics) error {
+	ids, err := idSetFromMetrics(data)
+	require.NoError(m.t, err)
+	return m.consume(ids)
+}
+
+// idSetFromLogs computes an idSet from given pmetric.Metrics. The idSet will contain ids of all metric data points.
+func idSetFromMetrics(data pmetric.Metrics) (idSet, error) {
+	ds := map[UniqueIDAttrVal]bool{}
+	rss := data.ResourceMetrics()
+	for i := 0; i < rss.Len(); i++ {
+		ils := rss.At(i).ScopeMetrics()
+		for j := 0; j < ils.Len(); j++ {
+			ss := ils.At(j).Metrics()
+			for k := 0; k < ss.Len(); k++ {
+				elem := ss.At(k)
+				switch elem.Type() {
+				case pmetric.MetricTypeGauge:
+					for l := 0; l < elem.Gauge().DataPoints().Len(); l++ {
+						dp := elem.Gauge().DataPoints().At(l)
+						if err := idSetFromDataPoint(ds, dp.Attributes()); err != nil {
+							return ds, err
+						}
+					}
+				case pmetric.MetricTypeSum:
+					for l := 0; l < elem.Sum().DataPoints().Len(); l++ {
+						dp := elem.Sum().DataPoints().At(l)
+						if err := idSetFromDataPoint(ds, dp.Attributes()); err != nil {
+							return ds, err
+						}
+					}
+				case pmetric.MetricTypeSummary:
+					for l := 0; l < elem.Summary().DataPoints().Len(); l++ {
+						dp := elem.Summary().DataPoints().At(l)
+						if err := idSetFromDataPoint(ds, dp.Attributes()); err != nil {
+							return ds, err
+						}
+					}
+				case pmetric.MetricTypeHistogram:
+					for l := 0; l < elem.Histogram().DataPoints().Len(); l++ {
+						dp := elem.Histogram().DataPoints().At(l)
+						if err := idSetFromDataPoint(ds, dp.Attributes()); err != nil {
+							return ds, err
+						}
+					}
+				case pmetric.MetricTypeExponentialHistogram:
+					for l := 0; l < elem.ExponentialHistogram().DataPoints().Len(); l++ {
+						dp := elem.ExponentialHistogram().DataPoints().At(l)
+						if err := idSetFromDataPoint(ds, dp.Attributes()); err != nil {
+							return ds, err
+						}
+					}
+				}
+			}
+		}
+	}
+	return ds, nil
+}
+
+func idSetFromDataPoint(ds map[UniqueIDAttrVal]bool, attributes pcommon.Map) error {
+	key, exists := attributes.Get(UniqueIDAttrName)
+	if !exists {
+		return fmt.Errorf("invalid data element, attribute %q is missing", UniqueIDAttrName)
+	}
+	if key.Type() != pcommon.ValueTypeStr {
+		return fmt.Errorf("invalid data element, attribute %q is wrong type %v", UniqueIDAttrName, key.Type())
+	}
+	ds[UniqueIDAttrVal(key.Str())] = true
+	return nil
+}
 
 // consume the elements with the specified ids, regardless of the element data type.
 func (m *mockConsumer) consume(ids idSet) error {
@@ -437,3 +506,62 @@ func CreateOneLogWithID(id UniqueIDAttrVal) plog.Logs {
 	)
 	return data
 }
+
+func CreateGaugeMetricWithID(id UniqueIDAttrVal) pmetric.Metrics {
+	data := pmetric.NewMetrics()
+	gauge := data.ResourceMetrics().AppendEmpty().ScopeMetrics().AppendEmpty().Metrics()
+	gauge.AppendEmpty().SetEmptyGauge().DataPoints().AppendEmpty().Attributes().PutStr(
+		UniqueIDAttrName,
+		string(id),
+	)
+	return data
+}
+
+func CreateSumMetricWithID(id UniqueIDAttrVal) pmetric.Metrics {
+	data := pmetric.NewMetrics()
+	sum := data.ResourceMetrics().AppendEmpty().ScopeMetrics().AppendEmpty().Metrics()
+	sum.AppendEmpty().SetEmptySum().DataPoints().AppendEmpty().Attributes().PutStr(
+		UniqueIDAttrName,
+		string(id),
+	)
+	return data
+}
+
+func CreateSummaryMetricWithID(id UniqueIDAttrVal) pmetric.Metrics {
+	data := pmetric.NewMetrics()
+	summary := data.ResourceMetrics().AppendEmpty().ScopeMetrics().AppendEmpty().Metrics()
+	summary.AppendEmpty().SetEmptySummary().DataPoints().AppendEmpty().Attributes().PutStr(
+		UniqueIDAttrName,
+		string(id),
+	)
+	return data
+}
+
+func CreateHistogramMetricWithID(id UniqueIDAttrVal) pmetric.Metrics {
+	data := pmetric.NewMetrics()
+	histogram := data.ResourceMetrics().AppendEmpty().ScopeMetrics().AppendEmpty().Metrics()
+	histogram.AppendEmpty().SetEmptyHistogram().DataPoints().AppendEmpty().Attributes().PutStr(
+		UniqueIDAttrName,
+		string(id),
+	)
+	return data
+}
+
+func CreateExponentialHistogramMetricWithID(id UniqueIDAttrVal) pmetric.Metrics {
+	data := pmetric.NewMetrics()
+	exponentialHistogram := data.ResourceMetrics().AppendEmpty().ScopeMetrics().AppendEmpty().Metrics()
+	exponentialHistogram.AppendEmpty().SetEmptyExponentialHistogram().DataPoints().AppendEmpty().Attributes().PutStr(
+		UniqueIDAttrName,
+		string(id),
+	)
+	return data
+}
+
+func CreateOneSpanWithID(id UniqueIDAttrVal) ptrace.Traces {
+	data := ptrace.NewTraces()
+	data.ResourceSpans().AppendEmpty().ScopeSpans().AppendEmpty().Spans().AppendEmpty().Attributes().PutStr(
+		UniqueIDAttrName,
+		string(id),
+	)
+	return data
+}