Propagate Lambda ResourceId or FaasId for the child spans (#104)

*Description of changes:*
For Lambda case, the Lambda resource attribute only exists on Handler
span, it needs to be propagated to its child spans. This PR includes the
changes,
1. if parent span contains `cloud.resource_id` or `faas.i` but not in
child span, child span will be propagated with one of these attribute
from parent.
2. if both exist `cloud.resource_id` takes priority
3. if none of two Lambda resource attrs exists, do nothing.

*Test:*

**Hander Span**
```
2024-10-16T17:53:20.216Z | 'faas.id': 'arn:aws:lambda:us-west-1:889414516288:function:aws-opentelemetry-distro-nodejs',
-- | --
  | 2024-10-16T17:53:20.216Z | 'cloud.account.id': '889414516288',
  | 2024-10-16T17:53:20.216Z | 'aws.is.local.root': true,
  | 2024-10-16T17:53:20.216Z | 'aws.local.service': 'aws-opentelemetry-distro-nodejs',
  | 2024-10-16T17:53:20.216Z | 'aws.local.operation': 'aws-opentelemetry-distro-nodejs/Handler',
```
**Child Span**
```
  | 2024-10-16T17:53:20.194Z | attributes: {
-- | -- | --
  | 2024-10-16T17:53:20.194Z | 'rpc.system': 'aws-api',
  | 2024-10-16T17:53:20.194Z | 'rpc.method': 'ListBuckets',
  | 2024-10-16T17:53:20.194Z | 'rpc.service': 'S3',
  | 2024-10-16T17:53:20.194Z | 'aws.is.local.root': false,
  | 2024-10-16T17:53:20.194Z | 'faas.id': 'arn:aws:lambda:us-west-1:889414516288:function:aws-opentelemetry-distro-nodejs',
  | 2024-10-16T17:53:20.194Z | 'aws.local.operation': 'aws-opentelemetry-distro-nodejs/Handler',
```
By submitting this pull request, I confirm that you can use, modify,
copy, and redistribute this contribution, under the terms of your
choice.

aws-distro-opentelemetry-node-autoinstrumentation/src/attribute-propagating-span-processor.ts

@@ -5,6 +5,7 @@ import { Span as APISpan, AttributeValue, Context, SpanKind, trace } from '@open
 import { ReadableSpan, Span, SpanProcessor } from '@opentelemetry/sdk-trace-base';
 import { AWS_ATTRIBUTE_KEYS } from './aws-attribute-keys';
 import { AwsSpanProcessingUtil } from './aws-span-processing-util';
+import { SEMRESATTRS_FAAS_ID } from '@opentelemetry/semantic-conventions';
 
 /**
  * AttributePropagatingSpanProcessor handles the propagation of attributes from parent spans to
@@ -85,6 +86,18 @@ export class AttributePropagatingSpanProcessor implements SpanProcessor {
       if (this.isConsumerKind(span) && this.isConsumerKind(parentReadableSpan)) {
         span.setAttribute(AWS_ATTRIBUTE_KEYS.AWS_CONSUMER_PARENT_SPAN_KIND, SpanKind[parentReadableSpan.kind]);
       }
+
+      // If parent span contains "cloud.resource_id" or "faas.id" but not in child span, child span will be
+      // propagated with one of these attribute from parent. "cloud.resource_id" takes priority if it exists
+      const parentResourceId = AwsSpanProcessingUtil.getResourceId(parentSpan);
+      const resourceId = AwsSpanProcessingUtil.getResourceId(span);
+      if (!resourceId && parentResourceId) {
+        if (AwsSpanProcessingUtil.isKeyPresent(parentSpan, AwsSpanProcessingUtil.CLOUD_RESOURCE_ID)) {
+          span.setAttribute(AwsSpanProcessingUtil.CLOUD_RESOURCE_ID, parentResourceId);
+        } else {
+          span.setAttribute(SEMRESATTRS_FAAS_ID, parentResourceId);
+        }
+      }
     }
 
     let propagationData: AttributeValue | undefined = undefined;

aws-distro-opentelemetry-node-autoinstrumentation/src/aws-span-processing-util.ts

@@ -15,6 +15,7 @@ import {
   SEMATTRS_HTTP_URL,
   SEMATTRS_MESSAGING_OPERATION,
   SEMATTRS_RPC_SYSTEM,
+  SEMRESATTRS_FAAS_ID,
 } from '@opentelemetry/semantic-conventions';
 import { AWS_ATTRIBUTE_KEYS } from './aws-attribute-keys';
 import { AWS_LAMBDA_FUNCTION_NAME_CONFIG, isLambdaEnvironment } from './aws-opentelemetry-configurator';
@@ -33,6 +34,9 @@ export class AwsSpanProcessingUtil {
   static LOCAL_ROOT: string = 'LOCAL_ROOT';
   static SQS_RECEIVE_MESSAGE_SPAN_NAME: string = 'Sqs.ReceiveMessage';
   static AWS_SDK_INSTRUMENTATION_SCOPE_PREFIX: string = '@opentelemetry/instrumentation-aws-sdk';
+  // "cloud.resource_id" is defined in semconv which has not yet picked up by OTel JS
+  // https://opentelemetry.io/docs/specs/semconv/attributes-registry/cloud/
+  static CLOUD_RESOURCE_ID: string = 'cloud.resource_id';
 
   // Max keyword length supported by parsing into remote_operation from DB_STATEMENT.
   // The current longest command word is DATETIME_INTERVAL_PRECISION at 27 characters.
@@ -273,4 +277,15 @@ export class AwsSpanProcessingUtil {
     const isLocalRoot: boolean = span.parentSpanId === undefined || !isParentSpanContextValid || isParentSpanRemote;
     span.setAttribute(AWS_ATTRIBUTE_KEYS.AWS_IS_LOCAL_ROOT, isLocalRoot);
   }
+
+  static getResourceId(span: ReadableSpan): string | undefined {
+    let resourceId: AttributeValue | undefined = undefined;
+    if (AwsSpanProcessingUtil.isKeyPresent(span, AwsSpanProcessingUtil.CLOUD_RESOURCE_ID)) {
+      resourceId = span.attributes[AwsSpanProcessingUtil.CLOUD_RESOURCE_ID];
+    } else if (AwsSpanProcessingUtil.isKeyPresent(span, SEMRESATTRS_FAAS_ID)) {
+      resourceId = span.attributes[SEMRESATTRS_FAAS_ID];
+    }
+
+    return typeof resourceId === 'string' ? resourceId : undefined;
+  }
 }

aws-distro-opentelemetry-node-autoinstrumentation/test/attribute-propagating-span-processor.test.ts

@@ -240,6 +240,44 @@ describe('AttributePropagatingSpanProcessorTest', () => {
     );
   });
 
+  it('testLambdaResourceIdAttributeExist', () => {
+    const parentSpan: APISpan = tracer.startSpan('parent', { kind: SpanKind.SERVER });
+
+    parentSpan.setAttribute(AwsSpanProcessingUtil.CLOUD_RESOURCE_ID, 'resource-123');
+
+    const childSpan: APISpan = createNestedSpan(parentSpan, 1);
+    expect((childSpan as any).attributes[AwsSpanProcessingUtil.CLOUD_RESOURCE_ID]).not.toBeUndefined();
+    expect((childSpan as any).attributes[AwsSpanProcessingUtil.CLOUD_RESOURCE_ID]).toEqual('resource-123');
+  });
+
+  it('testLambdaFaasIdAttributeExist', () => {
+    const parentSpan: APISpan = tracer.startSpan('parent', { kind: SpanKind.SERVER });
+
+    parentSpan.setAttribute('faas.id', 'faas-123');
+
+    const childSpan: APISpan = createNestedSpan(parentSpan, 1);
+    expect((childSpan as any).attributes['faas.id']).not.toBeUndefined();
+    expect((childSpan as any).attributes['faas.id']).toEqual('faas-123');
+  });
+
+  it('testBothLambdaFaasIdAndResourceIdAttributesExist', () => {
+    const parentSpan: APISpan = tracer.startSpan('parent', { kind: SpanKind.SERVER });
+
+    parentSpan.setAttribute('faas.id', 'faas-123');
+    parentSpan.setAttribute(AwsSpanProcessingUtil.CLOUD_RESOURCE_ID, 'resource-123');
+
+    const childSpan: APISpan = createNestedSpan(parentSpan, 1);
+    expect((childSpan as any).attributes[AwsSpanProcessingUtil.CLOUD_RESOURCE_ID]).not.toBeUndefined();
+    expect((childSpan as any).attributes[AwsSpanProcessingUtil.CLOUD_RESOURCE_ID]).toEqual('resource-123');
+  });
+
+  it('testLambdaNoneResourceAttributesExist', () => {
+    const parentSpan: APISpan = tracer.startSpan('parent', { kind: SpanKind.SERVER });
+
+    const childSpan: APISpan = createNestedSpan(parentSpan, 1);
+    expect((childSpan as any).attributes[AwsSpanProcessingUtil.CLOUD_RESOURCE_ID]).toBeUndefined();
+  });
+
   function createNestedSpan(parentSpan: APISpan, depth: number): APISpan {
     if (depth === 0) {
       return parentSpan;

aws-distro-opentelemetry-node-autoinstrumentation/test/aws-span-processing-util.test.ts

@@ -377,6 +377,36 @@ describe('AwsSpanProcessingUtilTest', () => {
     const actualOperation: string = AwsSpanProcessingUtil.getIngressOperation(spanDataMock);
     expect(actualOperation).toEqual('TestFunction/Handler');
   });
+
+  it('should return cloud.resource_id when present', () => {
+    spanDataMock.attributes[AwsSpanProcessingUtil.CLOUD_RESOURCE_ID] = 'cloud-123';
+    const result = AwsSpanProcessingUtil.getResourceId(spanDataMock);
+    expect(result).toBe('cloud-123');
+  });
+
+  it('should return faas.id when cloud.resource_id is not present', () => {
+    spanDataMock.attributes['faas.id'] = 'faas-123';
+    const result = AwsSpanProcessingUtil.getResourceId(spanDataMock);
+    expect(result).toBe('faas-123');
+  });
+
+  it('should return cloud.resource_id when both cloud.resource_id and faas.id are present', () => {
+    spanDataMock.attributes[AwsSpanProcessingUtil.CLOUD_RESOURCE_ID] = 'cloud-123';
+    spanDataMock.attributes['faas.id'] = 'faas-123';
+    const result = AwsSpanProcessingUtil.getResourceId(spanDataMock);
+    expect(result).toBe('cloud-123');
+  });
+
+  it('should return undefined when neither cloud.resource_id nor faas.id are present', () => {
+    const result = AwsSpanProcessingUtil.getResourceId(spanDataMock);
+    expect(result).toBeUndefined();
+  });
+
+  it('should return undefined if cloud.resource_id is not a string', () => {
+    spanDataMock.attributes[AwsSpanProcessingUtil.CLOUD_RESOURCE_ID] = 123; // Incorrect type
+    const result = AwsSpanProcessingUtil.getResourceId(spanDataMock);
+    expect(result).toBeUndefined();
+  });
 });
 
 function createMockSpanContext(): SpanContext {