Update VideoStreamer.js with new res.tryEnd

examples/VideoStreamer.js

@@ -6,9 +6,12 @@ const uWS = require('../dist/uws.js');
 const fs = require('fs');
 
 const port = 9001;
-const fileName = '/home/alexhultman/Downloads/Sintel.2010.720p.mkv';
+const fileName = 'C:\\Users\\Alex\\Downloads\\Sintel.2010.720p.mkv';
 const totalSize = fs.statSync(fileName).size;
 
+let openStreams = 0;
+let streamIndex = 0;
+
 console.log('Video size is: ' + totalSize + ' bytes');
 
 /* Helper function converting Node.js buffer to ArrayBuffer */
@@ -16,6 +19,21 @@ function toArrayBuffer(buffer) {
   return buffer.buffer.slice(buffer.byteOffset, buffer.byteOffset + buffer.byteLength);
 }
 
+/* Either onAborted or simply finished request */
+function onAbortedOrFinishedResponse(res, readStream) {
+
+  if (res.id == -1) {
+    console.log("ERROR! onAbortedOrFinishedResponse called twice for the same res!");
+  } else {
+    console.log('Stream was closed, openStreams: ' + --openStreams);
+    console.timeEnd(res.id);
+    readStream.destroy();
+  }
+
+  /* Mark this response already accounted for */
+  res.id = -1;
+}
+
 /* Helper function to pipe the ReadaleStream over an Http responses */
 function pipeStreamOverResponse(res, readStream, totalSize) {
   /* Careful! If Node.js would emit error before the first res.tryEnd, res will hang and never time out */
@@ -24,9 +42,16 @@ function pipeStreamOverResponse(res, readStream, totalSize) {
     /* We only take standard V8 units of data */
     const ab = toArrayBuffer(chunk);
 
-    /* Stream as far as we can */
+    /* Store where we are, globally, in our response */
     let lastOffset = res.getWriteOffset();
-    if (!res.tryEnd(ab, totalSize)) {
+
+    /* Streaming a chunk returns whether that chunk was sent, and if that chunk was last */
+    let [ok, done] = res.tryEnd(ab, totalSize);
+
+    /* Did we successfully send last chunk? */
+    if (done) {
+      onAbortedOrFinishedResponse(res, readStream);
+    } else if (!ok) {
       /* If we could not send this chunk, pause */
       readStream.pause();
 
@@ -36,32 +61,45 @@ function pipeStreamOverResponse(res, readStream, totalSize) {
 
       /* Register async handlers for drainage */
       res.onWritable((offset) => {
-        if (res.tryEnd(res.ab.slice(offset - res.abOffset), totalSize)) {
+        /* Here the timeout is off, we can spend as much time before calling tryEnd we want to */
+
+        /* On failure the timeout will start */
+        let [ok, done] = res.tryEnd(res.ab.slice(offset - res.abOffset), totalSize);
+        if (done) {
+          onAbortedOrFinishedResponse(res, readStream);
+        } else if (ok) {
+          /* We sent a chunk and it was not the last one, so let's resume reading.
+           * Timeout is still disabled, so we can spend any amount of time waiting
+           * for more chunks to send. */
           readStream.resume();
-          return true;
         }
-        return false;
+
+        /* We always have to return true/false in onWritable.
+         * If you did not send anything, return true for success. */
+        return ok;
       });
     }
-  }).on('end', () => {
+
+  }).on('error', () => {
     /* Todo: handle errors of the stream, probably good to simply close the response */
+    console.log('Unhandled read error from Node.js, you need to handle this!');
   });
 
   /* If you plan to asyncronously respond later on, you MUST listen to onAborted BEFORE returning */
   res.onAborted(() => {
-    console.log('Res is no longer valid!');
-    readStream.destroy();
+    onAbortedOrFinishedResponse(res, readStream);
   });
 }
 
 /* Yes, you can easily swap to SSL streaming by uncommenting here */
-const app = uWS.SSLApp({
+const app = uWS./*SSL*/App({
   key_file_name: 'misc/key.pem',
   cert_file_name: 'misc/cert.pem',
   passphrase: '1234'
 }).get('/sintel.mkv', (res, req) => {
   /* Log */
-  console.log("Streaming Sintel video...");
+  console.time(res.id = ++streamIndex);
+  console.log('Stream was opened, openStreams: ' + ++openStreams);
   /* Create read stream with Node.js and start streaming over Http */
   const readStream = fs.createReadStream(fileName);
   pipeStreamOverResponse(res, readStream, totalSize);

src/HttpResponseWrapper.h

@@ -160,7 +160,12 @@ struct HttpResponseWrapper {
                 invalidateResObject(args);
             }
 
-            args.GetReturnValue().Set(Boolean::New(isolate, ok));
+            /* This is a quick fix, it will need updating in µWS later on */
+            Local<Array> array = Array::New(isolate, 2);
+            array->Set(0, Boolean::New(isolate, ok));
+            array->Set(1, Boolean::New(isolate, res->hasResponded()));
+
+            args.GetReturnValue().Set(array);
         }
     }
 

uWebSockets

@@ -1 +1 @@
-Subproject commit eaa9467d1f680787f0f5c84ee4bf4a8e68a6ed70
+Subproject commit 5528e6f5fec2ffbd8e684e5d7d966eb0ae2bd5d5