chore: rename Agent to Extension

src/metrics/extension.spec.ts

@@ -1,35 +1,35 @@
 import nock from "nock";
 
-import { isAgentRunning, flushExtension, AGENT_URL } from "./extension";
+import { isExtensionRunning, flushExtension, EXTENSION_URL } from "./extension";
 import mock from "mock-fs";
 
-describe("isAgentRunning", () => {
+describe("isExtensionRunning", () => {
   afterEach(() => {
     mock.restore();
   });
-  it("returns true when agent exists and responds", async () => {
+  it("returns true when extension exists and responds", async () => {
     mock({
       "/opt/extensions/datadog-agent": Buffer.from([0]),
     });
-    const ran = await isAgentRunning();
+    const ran = await isExtensionRunning();
     expect(ran).toBeTruthy();
   });
-  it("returns false when agent doesn't exist", async () => {
+  it("returns false when extension doesn't exist", async () => {
     mock({});
-    const scope = nock(AGENT_URL).get("/lambda/hello").replyWithError("Unreachable");
-    const ran = await isAgentRunning();
+    const scope = nock(EXTENSION_URL).get("/lambda/hello").replyWithError("Unreachable");
+    const ran = await isExtensionRunning();
     expect(scope.isDone()).toBeFalsy();
     expect(ran).toBeFalsy();
   });
 });
 describe("flushExtension", () => {
-  it("calls flush on the agent", async () => {
-    const scope = nock(AGENT_URL).post("/lambda/flush", JSON.stringify({})).reply(200);
+  it("calls flush on the extension", async () => {
+    const scope = nock(EXTENSION_URL).post("/lambda/flush", JSON.stringify({})).reply(200);
     await flushExtension();
     expect(scope.isDone()).toBeTruthy();
   });
   it("catches error when flush doesn't respond", async () => {
-    const scope = nock(AGENT_URL).post("/lambda/flush", JSON.stringify({})).replyWithError("Unavailable");
+    const scope = nock(EXTENSION_URL).post("/lambda/flush", JSON.stringify({})).replyWithError("Unavailable");
     await flushExtension();
     expect(scope.isDone()).toBeTruthy();
   });

src/metrics/extension.ts

@@ -2,23 +2,23 @@ import { URL } from "url";
 import { post, logDebug, logError } from "../utils";
 import fs from "fs";
 
-export const AGENT_URL = "http://127.0.0.1:8124";
-const FLUSH_PATH = "/lambda/flush";
+export const EXTENSION_URL = "http://127.0.0.1:8124";
 const EXTENSION_PATH = "/opt/extensions/datadog-agent";
-const AGENT_TIMEOUT_MS = 100;
+const LOCAL_FLUSH_PATH = "/lambda/flush";
+const LOCAL_FLUSH_TIMEOUT_MS = 100;
 
-export async function isAgentRunning() {
+export async function isExtensionRunning() {
   const extensionExists = await fileExists(EXTENSION_PATH);
   if (!extensionExists) {
-    logDebug(`Agent isn't present in sandbox`);
+    logDebug(`Extension Layer is not present`);
     return false;
   }
   return true;
 }
 
 export async function flushExtension(): Promise<boolean> {
-  const url = new URL(FLUSH_PATH, AGENT_URL);
-  const result = await post(url, {}, { timeout: AGENT_TIMEOUT_MS });
+  const url = new URL(LOCAL_FLUSH_PATH, EXTENSION_URL);
+  const result = await post(url, {}, { timeout: LOCAL_FLUSH_TIMEOUT_MS });
   if (!result.success) {
     logError(`Failed to flush extension. ${result.errorMessage}`);
     return false;

src/metrics/listener.spec.ts

@@ -2,7 +2,7 @@ import nock from "nock";
 import mock from "mock-fs";
 
 import { LogLevel, setLogLevel } from "../utils";
-import { AGENT_URL } from "./extension";
+import { EXTENSION_URL } from "./extension";
 
 import { MetricsListener } from "./listener";
 import StatsDClient from "hot-shots";
@@ -105,7 +105,7 @@ describe("MetricsListener", () => {
     expect(spy).toHaveBeenCalledWith(`{"e":1487076708,"m":"my-metric","t":["tag:a","tag:b"],"v":10}\n`);
   });
   it("always sends metrics to statsD when extension is enabled, ignoring logForwarding=true", async () => {
-    const flushScope = nock(AGENT_URL).post("/lambda/flush", JSON.stringify({})).reply(200);
+    const flushScope = nock(EXTENSION_URL).post("/lambda/flush", JSON.stringify({})).reply(200);
     mock({
       "/opt/extensions/datadog-agent": Buffer.from([0]),
     });

src/metrics/listener.ts

@@ -2,7 +2,7 @@ import { StatsD } from "hot-shots";
 import { promisify } from "util";
 import { logDebug, logError } from "../utils";
 import { APIClient } from "./api";
-import { flushExtension, isAgentRunning } from "./extension";
+import { flushExtension, isExtensionRunning } from "./extension";
 import { KMSService } from "./kms-service";
 import { writeMetricToStdout } from "./metric-log";
 import { Distribution } from "./model";
@@ -59,20 +59,20 @@ export class MetricsListener {
   private currentProcessor?: Promise<Processor>;
   private apiKey: Promise<string>;
   private statsDClient?: StatsD;
-  private isAgentRunning?: boolean = undefined;
+  private isExtensionRunning?: boolean = undefined;
 
   constructor(private kmsClient: KMSService, private config: MetricsConfig) {
     this.apiKey = this.getAPIKey(config);
     this.config = config;
   }
 
   public async onStartInvocation(_: any) {
-    if (this.isAgentRunning === undefined) {
-      this.isAgentRunning = await isAgentRunning();
-      logDebug(`Extension present: ${this.isAgentRunning}`);
+    if (this.isExtensionRunning === undefined) {
+      this.isExtensionRunning = await isExtensionRunning();
+      logDebug(`Extension present: ${this.isExtensionRunning}`);
     }
 
-    if (this.isAgentRunning) {
+    if (this.isExtensionRunning) {
       logDebug(`Using StatsD client`);
 
       this.statsDClient = new StatsD({ host: "127.0.0.1", closingFlushInterval: 1 });
@@ -121,7 +121,7 @@ export class MetricsListener {
       }
     }
     try {
-      if (this.isAgentRunning && this.config.localTesting) {
+      if (this.isExtensionRunning && this.config.localTesting) {
         logDebug(`Flushing Extension for local test`);
         await flushExtension();
       }
@@ -140,7 +140,7 @@ export class MetricsListener {
     forceAsync: boolean,
     ...tags: string[]
   ) {
-    if (this.isAgentRunning) {
+    if (this.isExtensionRunning) {
       this.statsDClient?.distribution(name, value, undefined, tags);
       return;
     }