feat: Implement support for hooks.

contract-tests/TestHook.js

@@ -0,0 +1,44 @@
+import got from 'got';
+
+export default class TestHook {
+  constructor(name, endpoint, data) {
+    this._name = name;
+    this._endpoint = endpoint;
+    this._data = data;
+  }
+
+  async _safePost(body) {
+    try {
+      await got.post(this._endpoint, { json: body });
+    } catch {
+      // The test could move on before the post, so we are ignoring
+      // failed posts.
+    }
+  }
+
+  getMetadata() {
+    return {
+      name: 'LaunchDarkly Tracing Hook',
+    };
+  }
+
+  beforeEvaluation(hookContext, data) {
+    this._safePost({
+      evaluationSeriesContext: hookContext,
+      evaluationSeriesData: data,
+      stage: 'beforeEvaluation',
+    });
+    return { ...data, ...(this._data?.['beforeEvaluation'] || {}) };
+  }
+
+  afterEvaluation(hookContext, data, detail) {
+    this._safePost({
+      evaluationSeriesContext: hookContext,
+      evaluationSeriesData: data,
+      stage: 'afterEvaluation',
+      evaluationDetail: detail,
+    });
+
+    return { ...data, ...(this._data?.['afterEvaluation'] || {}) };
+  }
+}

contract-tests/index.js

@@ -34,6 +34,7 @@ app.get('/', (req, res) => {
       'polling-gzip',
       'inline-context',
       'anonymous-redaction',
+      'evaluation-hooks',
     ],
   });
 });

contract-tests/sdkClientEntity.js

@@ -10,6 +10,7 @@ import ld, {
 
 import BigSegmentTestStore from './BigSegmentTestStore.js';
 import { Log, sdkLogger } from './log.js';
+import TestHook from './TestHook.js';
 
 const badCommandError = new Error('unsupported command');
 export { badCommandError };
@@ -19,6 +20,7 @@ export function makeSdkConfig(options, tag) {
     logger: sdkLogger(tag),
     diagnosticOptOut: true,
   };
+
   const maybeTime = (seconds) =>
     seconds === undefined || seconds === null ? undefined : seconds / 1000;
   if (options.streaming) {
@@ -60,6 +62,11 @@ export function makeSdkConfig(options, tag) {
         : undefined,
     };
   }
+  if (options.hooks) {
+    cf.hooks = options.hooks.hooks.map(
+      (hook) => new TestHook(hook.name, hook.callbackUri, hook.data),
+    );
+  }
   return cf;
 }