fix: undefined stream.destroy call

lib/s3middleware/azureHelpers/SubStreamInterface.js

@@ -1,5 +1,20 @@
 const stream = require('stream');
 
+class SubStream extends stream.PassThrough {
+    constructor(options) {
+        super(options);
+
+        this.on('stopStreamingToAzure', function stopStreamingToAzure() {
+            this._abortStreaming();
+        });
+    }
+
+    _abortStreaming() {
+        this.push(null);
+        this.end();
+    }
+}
+
 /**
  * Interface for streaming subparts.
  * @class SubStreamInterface
@@ -14,7 +29,8 @@ class SubStreamInterface {
         this._totalLengthCounter = 0;
         this._lengthCounter = 0;
         this._subPartIndex = 0;
-        this._currentStream = new stream.PassThrough();
+        this._currentStream = new SubStream();
+        this._streamingAborted = false;
     }
 
     /**
@@ -51,12 +67,11 @@ class SubStreamInterface {
      * @return {undefined}
      */
     stopStreaming(piper) {
+        this._streamingAborted = true;
         if (piper) {
             piper.unpipe();
-            piper.destroy();
         }
-        this._sourceStream.destroy();
-        this._currentStream.destroy();
+        this._currentStream.emit('stopStreamingToAzure');
     }
 
     /**
@@ -97,7 +112,7 @@ class SubStreamInterface {
         this._totalLengthCounter += this._lengthCounter;
         this._lengthCounter = 0;
         this._subPartIndex++;
-        this._currentStream = new stream.PassThrough();
+        this._currentStream = new SubStream();
         this.resumeStreaming();
         return {
             nextStream: this._currentStream,
@@ -111,6 +126,10 @@ class SubStreamInterface {
      * @return {undefined}
      */
     write(chunk) {
+        if (this._streamingAborted) {
+            // don't write
+            return;
+        }
         const ready = this._currentStream.write(chunk);
 
         if (!ready) {

lib/s3middleware/azureHelpers/mpuUtils.js

@@ -151,9 +151,9 @@ dataStoreName, log, cb) => {
         'putting multiple parts');
 
     resultsCollector.on('error', (err, subPartIndex) => {
-        streamInterface.stopStreaming(request);
         log.error(`Error putting subpart to Azure: ${subPartIndex}`,
             { error: err.message, dataStoreName });
+        streamInterface.stopStreaming(request);
         if (err.code === 'ContainerNotFound') {
             return cb(errors.NoSuchBucket);
         }

tests/unit/s3middleware/azureHelpers/SubStreamingInterface.js

@@ -0,0 +1,63 @@
+const assert = require('assert');
+const stream = require('stream');
+const SubStreamInterface =
+    require('../../../../lib/s3middleware/azureHelpers/SubStreamInterface');
+
+describe('s3middleware SubStreamInterface.stopStreaming()', () => {
+    const eventsEmitted = {
+        sourceStreamUnpiped: false,
+        currentStreamStopStreamingToAzure: false,
+        currentStreamEnded: false,
+    };
+    const expectedSequence = {
+        sourceStreamUnpiped: 0,
+        currentStreamStopStreamingToAzure: 1,
+        currentStreamEnded: 2,
+    };
+    const data = Buffer.alloc(100);
+    let dataMarker = 0;
+    let eventSequence = 0;
+    const mockRequest = new stream.Readable({
+        read: () => {
+            if (dataMarker >= data.length) {
+                return mockRequest.push(null);
+            }
+            mockRequest.push(data.slice(dataMarker, dataMarker + 1));
+            dataMarker += 1;
+            return undefined;
+        },
+    });
+    const sourceStream = new stream.PassThrough();
+    const subStreamInterface = new SubStreamInterface(sourceStream);
+    sourceStream.on('unpipe', () => {
+        eventsEmitted.sourceStreamUnpiped = eventSequence++;
+    });
+    subStreamInterface._currentStream.on('stopStreamingToAzure', () => {
+        eventsEmitted.currentStreamStopStreamingToAzure = eventSequence++;
+    });
+    subStreamInterface._currentStream.on('finish', () => {
+        eventsEmitted.currentStreamEnded = eventSequence++;
+    });
+    it('should stop streaming data and end current stream', done => {
+        sourceStream.on('data', chunk => {
+            const currentLength = subStreamInterface.getLengthCounter();
+            if (currentLength === 10) {
+                Object.keys(eventsEmitted).forEach(key => {
+                    assert.strictEqual(eventsEmitted[key], false);
+                });
+                assert.strictEqual(mockRequest._readableState.pipesCount, 1);
+                return subStreamInterface.stopStreaming(mockRequest);
+            }
+            return subStreamInterface.write(chunk);
+        });
+        mockRequest.pipe(sourceStream);
+        setTimeout(() => {
+            Object.keys(eventsEmitted).forEach(key => {
+                assert.strictEqual(eventsEmitted[key], expectedSequence[key]);
+            });
+            assert.strictEqual(subStreamInterface.getLengthCounter(), 10);
+            assert.strictEqual(mockRequest._readableState.pipesCount, 0);
+            return done();
+        }, 1000);
+    });
+});