[exporter/clickhouse] Fix Nil Pointer Exception on Metrics/Traces export without service.name Resource Attribute (open-telemetry#37034)

<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
#### Description
Fixing Nil Pointer Exception regression introduced in
open-telemetry#35725

<!-- Issue number (e.g. open-telemetry#1234) or full URL to issue, if applicable. -->
#### Link to tracking issue
Fixes open-telemetry#37030

<!--Describe what testing was performed and which tests were added.-->
#### Testing
Unit test adjusted to include test Metric without `service.name`
Resource Attributes

<!--Describe the documentation added.-->
#### Documentation

<!--Please delete paragraphs that you did not use before submitting.-->

Author: Fiery-Fenix

.chloggen/fix_clickhouseexporter-metrics-npe.yaml

@@ -0,0 +1,27 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: bug_fix
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: clickhouseexporter
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Fix Nil Pointer Exception on Metrics/Traces export without service.name Resource Attribute
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [37030]
+
+# (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:
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# 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: [user]

exporter/clickhouseexporter/exporter_logs.go

@@ -12,7 +12,6 @@ import (
 	_ "github.com/ClickHouse/clickhouse-go/v2" // For register database driver.
 	"go.opentelemetry.io/collector/component"
 	"go.opentelemetry.io/collector/pdata/plog"
-	conventions "go.opentelemetry.io/collector/semconv/v1.27.0"
 	"go.uber.org/zap"
 
 	"github.com/open-telemetry/opentelemetry-collector-contrib/exporter/clickhouseexporter/internal"
@@ -77,10 +76,7 @@ func (e *logsExporter) pushLogsData(ctx context.Context, ld plog.Logs) error {
 			res := logs.Resource()
 			resURL := logs.SchemaUrl()
 			resAttr := internal.AttributesToMap(res.Attributes())
-			var serviceName string
-			if v, ok := res.Attributes().Get(conventions.AttributeServiceName); ok {
-				serviceName = v.Str()
-			}
+			serviceName := internal.GetServiceName(res.Attributes())
 
 			for j := 0; j < logs.ScopeLogs().Len(); j++ {
 				rs := logs.ScopeLogs().At(j).LogRecords()

exporter/clickhouseexporter/exporter_metrics_test.go

@@ -294,7 +294,7 @@ func simpleMetrics(count int) pmetric.Metrics {
 	}
 
 	rm = metrics.ResourceMetrics().AppendEmpty()
-	rm.Resource().Attributes().PutStr("service.name", "demo 2")
+	// Removed service.name from second metric to test both with/without ServiceName cases
 	rm.Resource().Attributes().PutStr("Resource Attributes 2", "value2")
 	rm.Resource().SetDroppedAttributesCount(20)
 	rm.SetSchemaUrl("Resource SchemaUrl 2")

exporter/clickhouseexporter/exporter_traces.go

@@ -14,7 +14,6 @@ import (
 	"github.com/ClickHouse/clickhouse-go/v2/lib/column"
 	"go.opentelemetry.io/collector/component"
 	"go.opentelemetry.io/collector/pdata/ptrace"
-	conventions "go.opentelemetry.io/collector/semconv/v1.27.0"
 	"go.uber.org/zap"
 
 	"github.com/open-telemetry/opentelemetry-collector-contrib/exporter/clickhouseexporter/internal"
@@ -77,7 +76,8 @@ func (e *tracesExporter) pushTraceData(ctx context.Context, td ptrace.Traces) er
 			spans := td.ResourceSpans().At(i)
 			res := spans.Resource()
 			resAttr := internal.AttributesToMap(res.Attributes())
-			serviceName, _ := res.Attributes().Get(conventions.AttributeServiceName)
+			serviceName := internal.GetServiceName(res.Attributes())
+
 			for j := 0; j < spans.ScopeSpans().Len(); j++ {
 				rs := spans.ScopeSpans().At(j).Spans()
 				scopeName := spans.ScopeSpans().At(j).Scope().Name()
@@ -96,7 +96,7 @@ func (e *tracesExporter) pushTraceData(ctx context.Context, td ptrace.Traces) er
 						r.TraceState().AsRaw(),
 						r.Name(),
 						r.Kind().String(),
-						serviceName.AsString(),
+						serviceName,
 						resAttr,
 						scopeName,
 						scopeVersion,

exporter/clickhouseexporter/internal/exponential_histogram_metrics.go

@@ -11,7 +11,6 @@ import (
 
 	"go.opentelemetry.io/collector/pdata/pcommon"
 	"go.opentelemetry.io/collector/pdata/pmetric"
-	conventions "go.opentelemetry.io/collector/semconv/v1.27.0"
 	"go.uber.org/zap"
 )
 
@@ -130,20 +129,22 @@ func (e *expHistogramMetrics) insert(ctx context.Context, db *sql.DB) error {
 		}()
 
 		for _, model := range e.expHistogramModels {
-			serviceName, _ := model.metadata.ResAttr.Get(conventions.AttributeServiceName)
+			resAttr := AttributesToMap(model.metadata.ResAttr)
+			scopeAttr := AttributesToMap(model.metadata.ScopeInstr.Attributes())
+			serviceName := GetServiceName(model.metadata.ResAttr)
 
 			for i := 0; i < model.expHistogram.DataPoints().Len(); i++ {
 				dp := model.expHistogram.DataPoints().At(i)
 				attrs, times, values, traceIDs, spanIDs := convertExemplars(dp.Exemplars())
 				_, err = statement.ExecContext(ctx,
-					AttributesToMap(model.metadata.ResAttr),
+					resAttr,
 					model.metadata.ResURL,
 					model.metadata.ScopeInstr.Name(),
 					model.metadata.ScopeInstr.Version(),
-					AttributesToMap(model.metadata.ScopeInstr.Attributes()),
+					scopeAttr,
 					model.metadata.ScopeInstr.DroppedAttributesCount(),
 					model.metadata.ScopeURL,
-					serviceName.AsString(),
+					serviceName,
 					model.metricName,
 					model.metricDescription,
 					model.metricUnit,

exporter/clickhouseexporter/internal/gauge_metrics.go

@@ -11,7 +11,6 @@ import (
 
 	"go.opentelemetry.io/collector/pdata/pcommon"
 	"go.opentelemetry.io/collector/pdata/pmetric"
-	conventions "go.opentelemetry.io/collector/semconv/v1.27.0"
 	"go.uber.org/zap"
 )
 
@@ -109,20 +108,22 @@ func (g *gaugeMetrics) insert(ctx context.Context, db *sql.DB) error {
 		}()
 
 		for _, model := range g.gaugeModels {
-			serviceName, _ := model.metadata.ResAttr.Get(conventions.AttributeServiceName)
+			resAttr := AttributesToMap(model.metadata.ResAttr)
+			scopeAttr := AttributesToMap(model.metadata.ScopeInstr.Attributes())
+			serviceName := GetServiceName(model.metadata.ResAttr)
 
 			for i := 0; i < model.gauge.DataPoints().Len(); i++ {
 				dp := model.gauge.DataPoints().At(i)
 				attrs, times, values, traceIDs, spanIDs := convertExemplars(dp.Exemplars())
 				_, err = statement.ExecContext(ctx,
-					AttributesToMap(model.metadata.ResAttr),
+					resAttr,
 					model.metadata.ResURL,
 					model.metadata.ScopeInstr.Name(),
 					model.metadata.ScopeInstr.Version(),
-					AttributesToMap(model.metadata.ScopeInstr.Attributes()),
+					scopeAttr,
 					model.metadata.ScopeInstr.DroppedAttributesCount(),
 					model.metadata.ScopeURL,
-					serviceName.AsString(),
+					serviceName,
 					model.metricName,
 					model.metricDescription,
 					model.metricUnit,

exporter/clickhouseexporter/internal/histogram_metrics.go

@@ -11,7 +11,6 @@ import (
 
 	"go.opentelemetry.io/collector/pdata/pcommon"
 	"go.opentelemetry.io/collector/pdata/pmetric"
-	conventions "go.opentelemetry.io/collector/semconv/v1.27.0"
 	"go.uber.org/zap"
 )
 
@@ -121,20 +120,22 @@ func (h *histogramMetrics) insert(ctx context.Context, db *sql.DB) error {
 		}()
 
 		for _, model := range h.histogramModel {
-			serviceName, _ := model.metadata.ResAttr.Get(conventions.AttributeServiceName)
+			resAttr := AttributesToMap(model.metadata.ResAttr)
+			scopeAttr := AttributesToMap(model.metadata.ScopeInstr.Attributes())
+			serviceName := GetServiceName(model.metadata.ResAttr)
 
 			for i := 0; i < model.histogram.DataPoints().Len(); i++ {
 				dp := model.histogram.DataPoints().At(i)
 				attrs, times, values, traceIDs, spanIDs := convertExemplars(dp.Exemplars())
 				_, err = statement.ExecContext(ctx,
-					AttributesToMap(model.metadata.ResAttr),
+					resAttr,
 					model.metadata.ResURL,
 					model.metadata.ScopeInstr.Name(),
 					model.metadata.ScopeInstr.Version(),
-					AttributesToMap(model.metadata.ScopeInstr.Attributes()),
+					scopeAttr,
 					model.metadata.ScopeInstr.DroppedAttributesCount(),
 					model.metadata.ScopeURL,
-					serviceName.AsString(),
+					serviceName,
 					model.metricName,
 					model.metricDescription,
 					model.metricUnit,

exporter/clickhouseexporter/internal/metrics_model.go

@@ -17,6 +17,7 @@ import (
 	"github.com/ClickHouse/clickhouse-go/v2/lib/column/orderedmap"
 	"go.opentelemetry.io/collector/pdata/pcommon"
 	"go.opentelemetry.io/collector/pdata/pmetric"
+	conventions "go.opentelemetry.io/collector/semconv/v1.27.0"
 	"go.uber.org/zap"
 )
 
@@ -175,6 +176,15 @@ func AttributesToMap(attributes pcommon.Map) column.IterableOrderedMap {
 	}, attributes.Len())
 }
 
+func GetServiceName(resAttr pcommon.Map) string {
+	var serviceName string
+	if v, ok := resAttr.Get(conventions.AttributeServiceName); ok {
+		serviceName = v.AsString()
+	}
+
+	return serviceName
+}
+
 func convertSliceToArraySet[T any](slice []T) clickhouse.ArraySet {
 	var set clickhouse.ArraySet
 	for _, item := range slice {

exporter/clickhouseexporter/internal/metrics_model_test.go

@@ -12,6 +12,7 @@ import (
 	"github.com/stretchr/testify/require"
 	"go.opentelemetry.io/collector/pdata/pcommon"
 	"go.opentelemetry.io/collector/pdata/pmetric"
+	conventions "go.opentelemetry.io/collector/semconv/v1.27.0"
 	"go.uber.org/zap/zaptest"
 )
 
@@ -225,3 +226,24 @@ func Test_newPlaceholder(t *testing.T) {
 	expectStr := "(?,?,?,?,?),"
 	require.Equal(t, newPlaceholder(5), &expectStr)
 }
+
+func Test_GetServiceName(t *testing.T) {
+	t.Run("should return empty string on unset service.name", func(t *testing.T) {
+		require.Equal(t, "", GetServiceName(pcommon.NewMap()))
+	})
+	t.Run("should return correct string from service.name", func(t *testing.T) {
+		resAttr := pcommon.NewMap()
+		resAttr.PutStr(conventions.AttributeServiceName, "test-service")
+		require.Equal(t, "test-service", GetServiceName(resAttr))
+	})
+	t.Run("should return empty string on empty service.name", func(t *testing.T) {
+		resAttr := pcommon.NewMap()
+		resAttr.PutEmpty(conventions.AttributeServiceName)
+		require.Equal(t, "", GetServiceName(resAttr))
+	})
+	t.Run("should return string from non-string service.name", func(t *testing.T) {
+		resAttr := pcommon.NewMap()
+		resAttr.PutBool(conventions.AttributeServiceName, true)
+		require.Equal(t, "true", GetServiceName(resAttr))
+	})
+}

exporter/clickhouseexporter/internal/sum_metrics.go

@@ -11,7 +11,6 @@ import (
 
 	"go.opentelemetry.io/collector/pdata/pcommon"
 	"go.opentelemetry.io/collector/pdata/pmetric"
-	conventions "go.opentelemetry.io/collector/semconv/v1.27.0"
 	"go.uber.org/zap"
 )
 
@@ -113,20 +112,22 @@ func (s *sumMetrics) insert(ctx context.Context, db *sql.DB) error {
 		}()
 
 		for _, model := range s.sumModel {
-			serviceName, _ := model.metadata.ResAttr.Get(conventions.AttributeServiceName)
+			resAttr := AttributesToMap(model.metadata.ResAttr)
+			scopeAttr := AttributesToMap(model.metadata.ScopeInstr.Attributes())
+			serviceName := GetServiceName(model.metadata.ResAttr)
 
 			for i := 0; i < model.sum.DataPoints().Len(); i++ {
 				dp := model.sum.DataPoints().At(i)
 				attrs, times, values, traceIDs, spanIDs := convertExemplars(dp.Exemplars())
 				_, err = statement.ExecContext(ctx,
-					AttributesToMap(model.metadata.ResAttr),
+					resAttr,
 					model.metadata.ResURL,
 					model.metadata.ScopeInstr.Name(),
 					model.metadata.ScopeInstr.Version(),
-					AttributesToMap(model.metadata.ScopeInstr.Attributes()),
+					scopeAttr,
 					model.metadata.ScopeInstr.DroppedAttributesCount(),
 					model.metadata.ScopeURL,
-					serviceName.AsString(),
+					serviceName,
 					model.metricName,
 					model.metricDescription,
 					model.metricUnit,