Export resource attributes from zipkin exporter (#2589)

* Export resource attributes from zipkin exporter

* Update CHANGELOG.md

Co-authored-by: Tyler Yahn <MrAlias@users.noreply.github.com>

* Refactoring

* Refactoring

Co-authored-by: Tyler Yahn <MrAlias@users.noreply.github.com>

CHANGELOG.md

@@ -17,6 +17,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 ### Changed
 
 - Jaeger exporter takes into additional 70 bytes overhead into consideration when sending UDP packets (#2489, #2512)
+- Zipkin exporter exports `Resource` attributes as the `Tags` field. (#2589)
 
 ### Deprecated
 

exporters/zipkin/model.go

@@ -168,6 +168,27 @@ func attributesToJSONMapString(attributes []attribute.KeyValue) string {
 	return (string)(jsonBytes)
 }
 
+// attributeToStringPair serializes each attribute to a string pair
+func attributeToStringPair(kv attribute.KeyValue) (string, string) {
+	switch kv.Value.Type() {
+	// For slice attributes, serialize as JSON list string.
+	case attribute.BOOLSLICE:
+		json, _ := json.Marshal(kv.Value.AsBoolSlice())
+		return (string)(kv.Key), (string)(json)
+	case attribute.INT64SLICE:
+		json, _ := json.Marshal(kv.Value.AsInt64Slice())
+		return (string)(kv.Key), (string)(json)
+	case attribute.FLOAT64SLICE:
+		json, _ := json.Marshal(kv.Value.AsFloat64Slice())
+		return (string)(kv.Key), (string)(json)
+	case attribute.STRINGSLICE:
+		json, _ := json.Marshal(kv.Value.AsStringSlice())
+		return (string)(kv.Key), (string)(json)
+	default:
+		return (string)(kv.Key), kv.Value.Emit()
+	}
+}
+
 // extraZipkinTags are those that may be added to every outgoing span
 var extraZipkinTags = []string{
 	"otel.status_code",
@@ -177,25 +198,15 @@ var extraZipkinTags = []string{
 
 func toZipkinTags(data tracesdk.ReadOnlySpan) map[string]string {
 	attr := data.Attributes()
-	m := make(map[string]string, len(attr)+len(extraZipkinTags))
+	resourceAttr := data.Resource().Attributes()
+	m := make(map[string]string, len(attr)+len(resourceAttr)+len(extraZipkinTags))
 	for _, kv := range attr {
-		switch kv.Value.Type() {
+		k, v := attributeToStringPair(kv)
-		// For slice attributes, serialize as JSON list string.
+		m[k] = v
-		case attribute.BOOLSLICE:
+	}
-			json, _ := json.Marshal(kv.Value.AsBoolSlice())
+	for _, kv := range resourceAttr {
-			m[(string)(kv.Key)] = (string)(json)
+		k, v := attributeToStringPair(kv)
-		case attribute.INT64SLICE:
+		m[k] = v
-			json, _ := json.Marshal(kv.Value.AsInt64Slice())
-			m[(string)(kv.Key)] = (string)(json)
-		case attribute.FLOAT64SLICE:
-			json, _ := json.Marshal(kv.Value.AsFloat64Slice())
-			m[(string)(kv.Key)] = (string)(json)
-		case attribute.STRINGSLICE:
-			json, _ := json.Marshal(kv.Value.AsStringSlice())
-			m[(string)(kv.Key)] = (string)(json)
-		default:
-			m[(string)(kv.Key)] = kv.Value.Emit()
-		}
 	}
 
 	if data.Status().Code != codes.Unset {

exporters/zipkin/model_test.go

@@ -39,6 +39,9 @@ import (
 func TestModelConversion(t *testing.T) {
 	resource := resource.NewSchemaless(
 		semconv.ServiceNameKey.String("model-test"),
+		semconv.ServiceVersionKey.String("0.1.0"),
+		attribute.Int64("resource-attr1", 42),
+		attribute.IntSlice("resource-attr2", []int{0, 1, 2}),
 	)
 
 	inputBatch := tracetest.SpanStubs{
@@ -408,6 +411,10 @@ func TestModelConversion(t *testing.T) {
 				"attr3":            "[0,1,2]",
 				"otel.status_code": "Error",
 				"error":            "404, file not found",
+				"service.name":     "model-test",
+				"service.version":  "0.1.0",
+				"resource-attr1":   "42",
+				"resource-attr2":   "[0,1,2]",
 			},
 		},
 		// model for span data with no parent
@@ -447,6 +454,10 @@ func TestModelConversion(t *testing.T) {
 				"attr2":            "bar",
 				"otel.status_code": "Error",
 				"error":            "404, file not found",
+				"service.name":     "model-test",
+				"service.version":  "0.1.0",
+				"resource-attr1":   "42",
+				"resource-attr2":   "[0,1,2]",
 			},
 		},
 		// model for span data of unspecified kind
@@ -486,6 +497,10 @@ func TestModelConversion(t *testing.T) {
 				"attr2":            "bar",
 				"otel.status_code": "Error",
 				"error":            "404, file not found",
+				"service.name":     "model-test",
+				"service.version":  "0.1.0",
+				"resource-attr1":   "42",
+				"resource-attr2":   "[0,1,2]",
 			},
 		},
 		// model for span data of internal kind
@@ -525,6 +540,10 @@ func TestModelConversion(t *testing.T) {
 				"attr2":            "bar",
 				"otel.status_code": "Error",
 				"error":            "404, file not found",
+				"service.name":     "model-test",
+				"service.version":  "0.1.0",
+				"resource-attr1":   "42",
+				"resource-attr2":   "[0,1,2]",
 			},
 		},
 		// model for span data of client kind
@@ -570,6 +589,10 @@ func TestModelConversion(t *testing.T) {
 				"peer.hostname":    "test-peer-hostname",
 				"otel.status_code": "Error",
 				"error":            "404, file not found",
+				"service.name":     "model-test",
+				"service.version":  "0.1.0",
+				"resource-attr1":   "42",
+				"resource-attr2":   "[0,1,2]",
 			},
 		},
 		// model for span data of producer kind
@@ -609,6 +632,10 @@ func TestModelConversion(t *testing.T) {
 				"attr2":            "bar",
 				"otel.status_code": "Error",
 				"error":            "404, file not found",
+				"service.name":     "model-test",
+				"service.version":  "0.1.0",
+				"resource-attr1":   "42",
+				"resource-attr2":   "[0,1,2]",
 			},
 		},
 		// model for span data of consumer kind
@@ -648,6 +675,10 @@ func TestModelConversion(t *testing.T) {
 				"attr2":            "bar",
 				"otel.status_code": "Error",
 				"error":            "404, file not found",
+				"service.name":     "model-test",
+				"service.version":  "0.1.0",
+				"resource-attr1":   "42",
+				"resource-attr2":   "[0,1,2]",
 			},
 		},
 		// model for span data with no events
@@ -678,6 +709,10 @@ func TestModelConversion(t *testing.T) {
 				"attr2":            "bar",
 				"otel.status_code": "Error",
 				"error":            "404, file not found",
+				"service.name":     "model-test",
+				"service.version":  "0.1.0",
+				"resource-attr1":   "42",
+				"resource-attr2":   "[0,1,2]",
 			},
 		},
 		// model for span data with an "error" attribute set to "false"
@@ -712,7 +747,12 @@ func TestModelConversion(t *testing.T) {
 					Value:     "ev2",
 				},
 			},
-			Tags: nil, // should be omitted
+			Tags: map[string]string{
+				"service.name":    "model-test",
+				"service.version": "0.1.0",
+				"resource-attr1":  "42",
+				"resource-attr2":  "[0,1,2]",
+			}, // only resource tags should be included
 		},
 	}
 	gottenOutputBatch := SpanModels(inputBatch)

exporters/zipkin/zipkin_test.go

@@ -200,6 +200,7 @@ func logStoreLogger(s *logStore) *log.Logger {
 func TestExportSpans(t *testing.T) {
 	resource := resource.NewSchemaless(
 		semconv.ServiceNameKey.String("exporter-test"),
+		semconv.ServiceVersionKey.String("0.1.0"),
 	)
 
 	spans := tracetest.SpanStubs{
@@ -271,6 +272,8 @@ func TestExportSpans(t *testing.T) {
 			Tags: map[string]string{
 				"otel.status_code": "Error",
 				"error":            "404, file not found",
+				"service.name":     "exporter-test",
+				"service.version":  "0.1.0",
 			},
 		},
 		// model of child
@@ -299,6 +302,8 @@ func TestExportSpans(t *testing.T) {
 			Tags: map[string]string{
 				"otel.status_code": "Error",
 				"error":            "403, forbidden",
+				"service.name":     "exporter-test",
+				"service.version":  "0.1.0",
 			},
 		},
 	}