fix(NODE-3833): return early on end if gridfs upload stream is already ended (mongodb#3223)

Author: dariakp

src/gridfs/upload.ts

@@ -196,7 +196,7 @@ export class GridFSBucketWriteStream extends Writable implements NodeJS.Writable
         ? encodingOrCallback
         : callback;
 
-    if (checkAborted(this, callback)) return this;
+    if (this.state.streamEnd || checkAborted(this, callback)) return this;
 
     this.state.streamEnd = true;
 

test/integration/gridfs/gridfs_stream.test.js

@@ -6,6 +6,8 @@ const fs = require('fs');
 const { setupDatabase, withClient } = require('./../shared');
 const { expect } = require('chai');
 const { GridFSBucket, ObjectId } = require('../../../src');
+const sinon = require('sinon');
+const { sleep } = require('../../tools/utils');
 
 describe('GridFS Stream', function () {
   before(function () {
@@ -947,6 +949,79 @@ describe('GridFS Stream', function () {
     }
   });
 
+  describe('upload stream end()', () => {
+    let client, db;
+
+    afterEach(async () => {
+      sinon.restore();
+      await client.close();
+    });
+
+    it('should not call the callback on repeat calls to end', {
+      metadata: { requires: { topology: ['single'] } },
+
+      async test() {
+        const configuration = this.configuration;
+        client = configuration.newClient(configuration.writeConcernMax(), {
+          maxPoolSize: 1
+        });
+        await client.connect();
+        db = client.db(configuration.db);
+        const bucket = new GridFSBucket(db, { bucketName: 'gridfsabort', chunkSizeBytes: 1 });
+        const uploadStream = bucket.openUploadStream('test.dat');
+
+        const endPromise = new Promise(resolve => {
+          uploadStream.end('1', resolve);
+        });
+
+        const endPromise2 = new Promise((resolve, reject) => {
+          uploadStream.end('2', () => {
+            reject(new Error('Expected callback to not be called on duplicate end'));
+          });
+        });
+
+        await endPromise;
+        // in the fail case, the callback would be called when the actual write is finished,
+        // so we need to give it a moment
+        await Promise.race([endPromise2, sleep(100)]);
+      }
+    });
+
+    it('should not write a chunk on repeat calls to end', {
+      metadata: { requires: { topology: ['single'] } },
+
+      async test() {
+        const configuration = this.configuration;
+        client = configuration.newClient(configuration.writeConcernMax(), {
+          maxPoolSize: 1
+        });
+        await client.connect();
+        db = client.db(this.configuration.db);
+        const bucket = new GridFSBucket(db, { bucketName: 'gridfsabort', chunkSizeBytes: 1 });
+        const uploadStream = bucket.openUploadStream('test.dat');
+        const spy = sinon.spy(uploadStream, 'write');
+
+        const endPromise = new Promise(resolve => {
+          uploadStream.end('1', resolve);
+        });
+
+        await endPromise;
+        expect(spy).to.have.been.calledWith('1');
+
+        uploadStream.end('2');
+
+        // wait for potential async calls to happen before we close the client
+        // so that we don't get a client not connected failure in the afterEach
+        // in the failure case since it would be confusing and unnecessary
+        // given the assertions we already have for this case
+        await sleep(100);
+
+        expect(spy).not.to.have.been.calledWith('2');
+        expect(spy.calledOnce).to.be.true;
+      }
+    });
+  });
+
   /**
    * Provide start and end parameters for file download to skip ahead x bytes and limit the total amount of bytes read to n
    *