feat(node-sdk): add serviceName config option

experimental/CHANGELOG.md

@@ -12,6 +12,7 @@ All notable changes to experimental packages in this project will be documented
 
 * feat(opentelemetry-instrumentation-fetch): optionally ignore network events #3028 @gregolsen
 * feat(http-instrumentation): record exceptions in http instrumentation #3008 @luismiramirez
+* feat(node-sdk): add serviceName config option #2867 @naseemkullah
 * feat(opentelemetry-exporter-prometheus): export PrometheusSerializer #3034 @matschaffer
 
 ### :bug: (Bug Fix)

experimental/packages/opentelemetry-sdk-node/README.md

@@ -128,6 +128,10 @@ Configure a trace exporter. If an exporter OR span processor is not configured,
 
 Configure tracing parameters. These are the same trace parameters used to [configure a tracer](../../../packages/opentelemetry-sdk-trace-base/src/types.ts#L71).
 
+### serviceName
+
+Configure the [service name](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/resource/semantic_conventions/README.md#service).
+
 ## Useful links
 
 - For more information on OpenTelemetry, visit: <https://opentelemetry.io/>

experimental/packages/opentelemetry-sdk-node/src/sdk.ts

@@ -14,23 +14,26 @@
  * limitations under the License.
  */
 
-import { TextMapPropagator } from '@opentelemetry/api';
+import { ContextManager, TextMapPropagator } from '@opentelemetry/api';
 import { metrics } from '@opentelemetry/api-metrics';
-import { ContextManager } from '@opentelemetry/api';
-import { MeterProvider, MetricReader } from '@opentelemetry/sdk-metrics-base';
 import {
   InstrumentationOption,
-  registerInstrumentations,
+  registerInstrumentations
 } from '@opentelemetry/instrumentation';
-import { NodeTracerConfig, NodeTracerProvider } from '@opentelemetry/sdk-trace-node';
 import {
   detectResources,
   envDetector,
   processDetector,
   Resource,
-  ResourceDetectionConfig,
+  ResourceDetectionConfig
 } from '@opentelemetry/resources';
-import { BatchSpanProcessor, SpanProcessor } from '@opentelemetry/sdk-trace-base';
+import { MeterProvider, MetricReader } from '@opentelemetry/sdk-metrics-base';
+import {
+  BatchSpanProcessor,
+  SpanProcessor
+} from '@opentelemetry/sdk-trace-base';
+import { NodeTracerConfig, NodeTracerProvider } from '@opentelemetry/sdk-trace-node';
+import { SemanticResourceAttributes } from '@opentelemetry/semantic-conventions';
 import { NodeSDKConfiguration } from './types';
 
 /** This class represents everything needed to register a fully configured OpenTelemetry Node.js SDK */
@@ -50,13 +53,16 @@ export class NodeSDK {
 
   private _tracerProvider?: NodeTracerProvider;
   private _meterProvider?: MeterProvider;
+  private _serviceName?: string;
 
   /**
    * Create a new NodeJS SDK instance
    */
   public constructor(configuration: Partial<NodeSDKConfiguration> = {}) {
     this._resource = configuration.resource ?? new Resource({});
 
+    this._serviceName = configuration.serviceName;
+
     this._autoDetectResources = configuration.autoDetectResources ?? true;
 
     if (configuration.spanProcessor || configuration.traceExporter) {
@@ -113,7 +119,9 @@ export class NodeSDK {
   }
 
   /** Detect resource attributes */
-  public async detectResources(config?: ResourceDetectionConfig): Promise<void> {
+  public async detectResources(
+    config?: ResourceDetectionConfig
+  ): Promise<void> {
     const internalConfig: ResourceDetectionConfig = {
       detectors: [ envDetector, processDetector],
       ...config,
@@ -135,6 +143,12 @@ export class NodeSDK {
       await this.detectResources();
     }
 
+    this._resource = this._serviceName === undefined
+      ? this._resource
+      : this._resource.merge(new Resource(
+        {[SemanticResourceAttributes.SERVICE_NAME]: this._serviceName}
+      ));
+
     if (this._tracerProviderConfig) {
       const tracerProvider = new NodeTracerProvider({
         ...this._tracerProviderConfig.tracerConfig,

experimental/packages/opentelemetry-sdk-node/src/types.ts

@@ -14,15 +14,15 @@
  * limitations under the License.
  */
 
-import { SpanAttributes, TextMapPropagator, Sampler } from '@opentelemetry/api';
-import type { ContextManager } from '@opentelemetry/api';
+import type { ContextManager, SpanAttributes } from '@opentelemetry/api';
+import { Sampler, TextMapPropagator } from '@opentelemetry/api';
 import { InstrumentationOption } from '@opentelemetry/instrumentation';
-import { MetricReader } from '@opentelemetry/sdk-metrics-base';
 import { Resource } from '@opentelemetry/resources';
+import { MetricReader } from '@opentelemetry/sdk-metrics-base';
 import {
   SpanExporter,
-  SpanProcessor,
   SpanLimits,
+  SpanProcessor
 } from '@opentelemetry/sdk-trace-base';
 
 export interface NodeSDKConfiguration {
@@ -34,6 +34,7 @@ export interface NodeSDKConfiguration {
   instrumentations: InstrumentationOption[];
   resource: Resource;
   sampler: Sampler;
+  serviceName?: string;
   spanProcessor: SpanProcessor;
   traceExporter: SpanExporter;
   spanLimits: SpanLimits;

experimental/packages/opentelemetry-sdk-node/test/sdk.test.ts

@@ -261,4 +261,76 @@ describe('Node SDK', () => {
       });
     });
   });
+
+  describe('configureServiceName', async () => {
+    it('should configure service name via config', async () => {
+      const sdk = new NodeSDK({
+        serviceName: 'config-set-name',
+      });
+
+      await sdk.start();
+      const resource = sdk['_resource'];
+
+      assertServiceResource(resource, {
+        name: 'config-set-name',
+      });
+    });
+
+    it('should configure service name via OTEL_SERVICE_NAME env var', async () => {
+      process.env.OTEL_SERVICE_NAME='env-set-name';
+      const sdk = new NodeSDK();
+
+      await sdk.start();
+      const resource = sdk['_resource'];
+
+      assertServiceResource(resource, {
+        name: 'env-set-name',
+      });
+      delete process.env.OTEL_SERVICE_NAME;
+    });
+
+    it('should favor config set service name over OTEL_SERVICE_NAME env set service name', async () => {
+      process.env.OTEL_SERVICE_NAME='env-set-name';
+      const sdk = new NodeSDK({
+        serviceName: 'config-set-name',
+      });
+
+      await sdk.start();
+      const resource = sdk['_resource'];
+
+      assertServiceResource(resource, {
+        name: 'config-set-name',
+      });
+      delete process.env.OTEL_SERVICE_NAME;
+    });
+
+
+    it('should configure service name via OTEL_RESOURCE_ATTRIBUTES env var', async () => {
+      process.env.OTEL_RESOURCE_ATTRIBUTES = 'service.name=resource-env-set-name';
+      const sdk = new NodeSDK();
+
+      await sdk.start();
+      const resource = sdk['_resource'];
+
+      assertServiceResource(resource, {
+        name: 'resource-env-set-name',
+      });
+      delete process.env.OTEL_RESOURCE_ATTRIBUTES;
+    });
+
+    it('should favor config set service name over OTEL_RESOURCE_ATTRIBUTES env set service name', async () => {
+      process.env.OTEL_RESOURCE_ATTRIBUTES = 'service.name=resource-env-set-name';
+      const sdk = new NodeSDK({
+        serviceName: 'config-set-name',
+      });
+
+      await sdk.start();
+      const resource = sdk['_resource'];
+
+      assertServiceResource(resource, {
+        name: 'config-set-name',
+      });
+      delete process.env.OTEL_RESOURCE_ATTRIBUTES;
+    });
+  });
 });

experimental/packages/opentelemetry-sdk-node/test/util/resource-assertions.ts

@@ -232,7 +232,7 @@ export const assertServiceResource = (
   resource: Resource,
   validations: {
     name: string;
-    instanceId: string;
+    instanceId?: string;
     namespace?: string;
     version?: string;
   }