storage: close sockets on error

lib/storage/file.js

@@ -401,6 +401,8 @@ File.prototype.createReadStream = function(options) {
     util.is(options.start, 'number') || util.is(options.end, 'number');
   var throughStream = streamEvents(through());
 
+  var requestStream;
+
   var validations = ['crc32c', 'md5'];
   var validation;
 
@@ -430,6 +432,22 @@ File.prototype.createReadStream = function(options) {
     o: encodeURIComponent(this.name)
   });
 
+  // End the stream, first emitting an error or complete event.
+  var endThroughStream = once(function(err, resp) {
+    if (err) {
+      throughStream.emit('error', err, resp);
+    } else {
+      throughStream.emit('complete', resp);
+    }
+
+    throughStream.destroy();
+  });
+
+  var endRequestStream = once(function() {
+    requestStream.abort();
+    requestStream.destroy();
+  });
+
   createAuthorizedReq(remoteFilePath);
 
   return throughStream;
@@ -458,7 +476,7 @@ File.prototype.createReadStream = function(options) {
     that.bucket.storage.makeAuthorizedRequest_(reqOpts, {
       onAuthorized: function(err, authorizedReqOpts) {
         if (err) {
-          done(err, null);
+          endThroughStream(err);
           return;
         }
 
@@ -467,8 +485,13 @@ File.prototype.createReadStream = function(options) {
         var localCrcHash;
         var localMd5Hash = crypto.createHash('md5');
 
-        request(authorizedReqOpts)
-          .on('error', done)
+        requestStream = request(authorizedReqOpts);
+
+        requestStream
+          .on('error', function(err) {
+            endRequestStream();
+            endThroughStream(err);
+          })
 
           .on('response', throughStream.emit.bind(throughStream, 'response'))
 
@@ -485,13 +508,13 @@ File.prototype.createReadStream = function(options) {
           .on('complete', function(res) {
             util.handleResp(null, res, res.body, function(err, resp) {
               if (err) {
-                done(err, resp);
+                endThroughStream(err, resp);
                 return;
               }
 
               if (rangeRequest) {
                 // Range requests can't receive data integrity checks.
-                done(null, resp);
+                endThroughStream(null, resp);
                 return;
               }
 
@@ -531,28 +554,19 @@ File.prototype.createReadStream = function(options) {
                 ].join(' '));
                 mismatchError.code = 'CONTENT_DOWNLOAD_MISMATCH';
 
-                done(mismatchError, resp);
+                endThroughStream(mismatchError, resp);
               } else {
-                done(null, resp);
+                endThroughStream(null, resp);
               }
             });
           })
 
-          .pipe(throughStream);
+          .pipe(throughStream)
+
+          .on('error', endRequestStream);
       }
     });
   }
-
-  // End the stream, first emitting an error or complete event.
-  function done(err) {
-    if (err) {
-      throughStream.emit('error', err);
-    } else {
-      throughStream.emit('complete');
-    }
-
-    throughStream.end();
-  }
 };
 
 /**