Added agent option to http transport

package.json

@@ -14,7 +14,7 @@
     "lint:ts": "tslint -c tslint.json -e './packages/**/node_modules/**/*.ts' './packages/**/*.ts'",
     "lint": "npm-run-all --parallel lint:*",
     "test:es": "npm run lerna-test",
-    "test:ts": "tsr packages/zipkin/test-types/*.test.ts --noAnnotate --libDeclarations && mocha --opts test/mocha-types.opts",
+    "test:ts": "tsr packages/*/test-types/*.test.ts --noAnnotate --libDeclarations && mocha --opts test/mocha-types.opts",
     "test": "npm run test:es && npm run test:ts",
     "lerna-test": "lerna run test",
     "lerna-test-browser": "lerna run test-browser",

packages/zipkin-transport-http/index.d.ts

@@ -1,14 +1,21 @@
+import {Agent as HttpAgent } from 'http';
+import {Agent as HttpsAgent} from 'https';
 import {JsonEncoder, Logger, model} from 'zipkin';
 
+type Agent = HttpAgent | HttpsAgent;
+
 declare class HttpLogger implements Logger {
   constructor(options: {
     endpoint: string,
     httpInterval?: number,
     jsonEncoder?: JsonEncoder,
-    httpTimeout?: number,
+    timeout?: number,
+    maxPayloadSize?: number,
     headers?: { [name: string]: any },
+    agent?: Agent | (() => Agent),
     log?: Console
   });
+
   logSpan(span: model.Span): void;
 }
 export {HttpLogger};

packages/zipkin-transport-http/src/HttpLogger.js

@@ -13,6 +13,7 @@ class HttpLogger extends EventEmitter {
   constructor({
     endpoint,
     headers = {},
+    agent = null,
     httpInterval = 1000,
     jsonEncoder = JSON_V1,
     timeout = 0,
@@ -23,6 +24,7 @@ class HttpLogger extends EventEmitter {
     super(); // must be before any reference to *this*
     this.log = log;
     this.endpoint = endpoint;
+    this.agent = agent;
     this.maxPayloadSize = maxPayloadSize;
     this.queue = [];
     this.queueBytes = 0;
@@ -88,6 +90,7 @@ class HttpLogger extends EventEmitter {
         body: postBody,
         headers: self.headers,
         timeout: self.timeout,
+        agent: self.agent
       }).then((response) => {
         if (response.status !== 202 && response.status !== 200) {
           const err = 'Unexpected response while sending Zipkin data, status:'

packages/zipkin-transport-http/test-types/HttpLogger.test.ts

@@ -0,0 +1,37 @@
+import { expect } from 'chai';
+
+import {Agent as HttpAgent } from 'http';
+import {Agent as HttpsAgent} from 'https';
+import {jsonEncoder} from 'zipkin';
+
+import { HttpLogger } from 'zipkin-transport-http';
+
+describe('HttpLogger', () => {
+  it('should have correct type', () => {
+    const options = {
+      endpoint: 'testEndpoint',
+      httpInterval: 1000,
+      jsonEncoder: jsonEncoder.JSON_V1,
+      timeout: 0,
+      maxPayloadSize: 0,
+      headers: {},
+      agent: new HttpAgent(),
+      log: console
+    };
+    const httpLogger: HttpLogger = new HttpLogger(options);
+
+    expect(httpLogger.logSpan).to.be.a('function');
+  });
+
+  it('should accept Http(s) Agent or function which returns Agent', () => {
+    const agents = [new HttpAgent(), new HttpsAgent(), () => new HttpAgent(), () => new HttpsAgent()];
+
+    agents.forEach(agent => {
+      const options = {
+        endpoint: 'testEndpoint',
+        agent
+      };
+      const httpLogger: HttpLogger = new HttpLogger(options);
+    });
+  });
+});