fix(exporter-jaeger): add env variable for agent port (#2754)

Author: blumamir

packages/opentelemetry-core/src/utils/environment.ts

@@ -34,6 +34,7 @@ const ENVIRONMENT_NUMBERS_KEYS = [
   'OTEL_SPAN_ATTRIBUTE_COUNT_LIMIT',
   'OTEL_SPAN_EVENT_COUNT_LIMIT',
   'OTEL_SPAN_LINK_COUNT_LIMIT',
+  'OTEL_EXPORTER_JAEGER_AGENT_PORT',
 ] as const;
 
 type ENVIRONMENT_NUMBERS = {
@@ -109,6 +110,7 @@ export const DEFAULT_ENVIRONMENT: Required<ENVIRONMENT> = {
   OTEL_BSP_MAX_QUEUE_SIZE: 2048,
   OTEL_BSP_SCHEDULE_DELAY: 5000,
   OTEL_EXPORTER_JAEGER_AGENT_HOST: '',
+  OTEL_EXPORTER_JAEGER_AGENT_PORT: 6832,
   OTEL_EXPORTER_JAEGER_ENDPOINT: '',
   OTEL_EXPORTER_JAEGER_PASSWORD: '',
   OTEL_EXPORTER_JAEGER_USER: '',

packages/opentelemetry-core/test/utils/environment.test.ts

@@ -78,6 +78,7 @@ describe('environment', () => {
         OTEL_BSP_MAX_EXPORT_BATCH_SIZE: 40,
         OTEL_BSP_SCHEDULE_DELAY: 50,
         OTEL_EXPORTER_JAEGER_AGENT_HOST: 'host.domain.com',
+        OTEL_EXPORTER_JAEGER_AGENT_PORT: 1234,
         OTEL_EXPORTER_JAEGER_ENDPOINT: 'https://example.com/endpoint',
         OTEL_EXPORTER_JAEGER_PASSWORD: 'secret',
         OTEL_EXPORTER_JAEGER_USER: 'whoami',
@@ -112,6 +113,7 @@ describe('environment', () => {
         env.OTEL_EXPORTER_JAEGER_AGENT_HOST,
         'host.domain.com'
       );
+      assert.strictEqual(env.OTEL_EXPORTER_JAEGER_AGENT_PORT, 1234);
       assert.strictEqual(
         env.ECS_CONTAINER_METADATA_URI_V4,
         'https://ecs.uri/v4'

packages/opentelemetry-exporter-jaeger/src/jaeger.ts

@@ -53,6 +53,7 @@ export class JaegerExporter implements SpanExporter {
     localConfig.password =
       localConfig.password || env.OTEL_EXPORTER_JAEGER_PASSWORD;
     localConfig.host = localConfig.host || env.OTEL_EXPORTER_JAEGER_AGENT_HOST;
+    localConfig.port = localConfig.port || env.OTEL_EXPORTER_JAEGER_AGENT_PORT;
 
     this._localConfig = localConfig;
 

packages/opentelemetry-exporter-jaeger/test/jaeger.test.ts

@@ -116,8 +116,9 @@ describe('JaegerExporter', () => {
       assert.strictEqual(sender._host, 'localhost');
     });
 
-    it('should respect jaeger host env variable', () => {
+    it('should respect jaeger host and port env variable', () => {
       process.env.OTEL_EXPORTER_JAEGER_AGENT_HOST = 'env-set-host';
+      process.env.OTEL_EXPORTER_JAEGER_AGENT_PORT = '1234';
       const exporter = new JaegerExporter();
       const sender = exporter['_getSender']({
         tags: [{
@@ -126,12 +127,15 @@ describe('JaegerExporter', () => {
         }]
       } as any);
       assert.strictEqual(sender._host, 'env-set-host');
+      assert.strictEqual(sender._port, 1234);
     });
 
-    it('should prioritize host option over env variable', () => {
+    it('should prioritize host and port option over env variable', () => {
       process.env.OTEL_EXPORTER_JAEGER_AGENT_HOST = 'env-set-host';
+      process.env.OTEL_EXPORTER_JAEGER_AGENT_PORT = '1234';
       const exporter = new JaegerExporter({
         host: 'option-set-host',
+        port: 5678
       });
       const sender = exporter['_getSender']({
         tags: [{
@@ -140,6 +144,7 @@ describe('JaegerExporter', () => {
         }]
       } as any);
       assert.strictEqual(sender._host, 'option-set-host');
+      assert.strictEqual(sender._port, 5678);
     });
 
     it('should construct an exporter with flushTimeout', () => {