prepare 3.1.1 release (#6)

Author: LaunchDarklyCI

package-lock.json

@@ -1,5 +1,6 @@
 import * as errors from './errors';
 import * as utils from './utils';
+import uuidv1 from 'uuid/v1';
 
 const MAX_URL_LENGTH = 2000;
 
@@ -23,12 +24,14 @@ export default function EventSender(platform, eventsUrl, environmentId, options)
 
   function sendChunk(events, usePost) {
     const jsonBody = JSON.stringify(events);
+    const payloadId = uuidv1();
 
     function doPostRequest(canRetry) {
       const headers = utils.extend(
         {
           'Content-Type': 'application/json',
           'X-LaunchDarkly-Event-Schema': '3',
+          'X-LaunchDarkly-Payload-ID': payloadId,
         },
         utils.getLDHeaders(platform, options)
       );

src/EventSender.js

@@ -118,6 +118,24 @@ describe('EventSender', () => {
       expect(r.headers['x-launchdarkly-wrapper']).toBeUndefined();
     });
 
+    it('should send unique payload IDs', async () => {
+      const options = { sendLDHeaders: true };
+      const server = platform.testing.http.newServer();
+      server.byDefault(respond(202));
+      const sender = EventSender(platform, server.url, envId, options);
+      const event = { kind: 'identify', key: 'userKey' };
+      await sender.sendEvents([event], false);
+      await sender.sendEvents([event], false);
+
+      const r0 = await server.nextRequest();
+      const r1 = await server.nextRequest();
+      const id0 = r0.headers['x-launchdarkly-payload-id'];
+      const id1 = r1.headers['x-launchdarkly-payload-id'];
+      expect(id0).toBeTruthy();
+      expect(id1).toBeTruthy();
+      expect(id0).not.toEqual(id1);
+    });
+
     it('should send wrapper info if present', async () => {
       const options = { sendLDHeaders: true, wrapperName: 'FakeSDK' };
       const server = platform.testing.http.newServer();
@@ -146,9 +164,13 @@ describe('EventSender', () => {
         await sender.sendEvents([event], false);
 
         expect(server.requests.length()).toEqual(2);
-        await server.nextRequest();
+        const r0 = await server.nextRequest();
         const r1 = await server.nextRequest();
+        expect(JSON.parse(r0.body)).toEqual([event]);
         expect(JSON.parse(r1.body)).toEqual([event]);
+        const id0 = r0.headers['x-launchdarkly-payload-id'];
+        expect(id0).toBeTruthy();
+        expect(r1.headers['x-launchdarkly-payload-id']).toEqual(id0);
       });
     }