no more websocket ack messages, just use lower-level backpressure

Cargo.lock

@@ -1778,7 +1778,7 @@ dependencies = [
 
 [[package]]
 name = "transbeam"
-version = "0.3.0"
+version = "0.4.0"
 dependencies = [
  "actix",
  "actix-files",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "transbeam"
-version = "0.3.0"
+version = "0.4.0"
 authors = ["xenofem <xenofem@xeno.science>"]
 edition = "2021"
 license = "MIT"

cli/transbeam-cli

@@ -51,10 +51,6 @@ async def send(paths, host, password, lifetime, collection_name=None):
         loader = file_loader([(paths[i], fileMetadata[i]["size"]) for i in range(len(paths))])
         for data in loader:
             await ws.send(data)
-            resp = await ws.recv()
-            if resp != "ack":
-                tqdm.write("unexpected response: {}".format(resp))
-                exit(1)
 
 parser = argparse.ArgumentParser(description="Upload files to transbeam")
 parser.add_argument("-l", "--lifetime", type=int, default=7, help="Lifetime in days for files (default 7)")

src/upload.rs

@@ -211,10 +211,6 @@ impl StreamHandler<Result<ws::Message, ws::ProtocolError>> for Uploader {
     }
 }
 
-fn ack(ctx: &mut Context) {
-    ctx.text("ack");
-}
-
 impl Uploader {
     fn notify_error_and_cleanup(&mut self, e: Error, ctx: &mut Context) {
         error!("{}", e);
@@ -350,13 +346,10 @@ impl Uploader {
                     }),
                 );
             }
-            ws::Message::Binary(data) | ws::Message::Continuation(Item::Last(data)) => {
-                let result = self.handle_data(data)?;
-                ack(ctx);
-                return Ok(result);
-            }
-            ws::Message::Continuation(Item::FirstBinary(data))
-            | ws::Message::Continuation(Item::Continue(data)) => {
+            ws::Message::Binary(data)
+            | ws::Message::Continuation(Item::FirstBinary(data))
+            | ws::Message::Continuation(Item::Continue(data))
+            | ws::Message::Continuation(Item::Last(data)) => {
                 return self.handle_data(data);
             }
             ws::Message::Close(reason) => {

static/js/upload.js

@@ -2,6 +2,8 @@ const FILE_CHUNK_SIZE = 16384;
 const MAX_FILES = 256;
 const SAMPLE_WINDOW = 100;
 const STALL_THRESHOLD = 1000;
+const MAX_WS_BUFFER = 1048576;
+const WS_BUFFER_DELAY = 10;
 
 let files = [];
 
@@ -204,7 +206,11 @@ function sendManifest() {
 }
 
 function handleMessage(msg) {
-    if (bytesSent === 0) {
+    if (bytesSent > 0) {
+        console.warn('Received unexpected message from server during upload', msg.data);
+        return;
+    }
+
     let reply;
     try {
         reply = JSON.parse(msg.data);
@@ -237,15 +243,6 @@ function handleMessage(msg) {
     } else if (reply.type === 'error') {
         displayError(reply.details);
     }
-    } else {
-        if (msg.data === 'ack') {
-            sendData();
-        } else {
-            console.error('Received unexpected message from server instead of ack', msg.data);
-            displayError();
-            socket.close();
-        }
-    }
 }
 
 function updateMaxLifetime(lifetime) {
@@ -262,10 +259,21 @@ function updateMaxLifetime(lifetime) {
 }
 
 function sendData() {
+    if (socket.readyState !== 1) {
+        return;
+    }
+
+    while (true) {
         if (fileIndex >= files.length) {
             finishSending();
             return;
         }
+
+        if (socket.bufferedAmount >= MAX_WS_BUFFER) {
+            setTimeout(sendData, WS_BUFFER_DELAY);
+            return;
+        }
+
         const currentFile = files[fileIndex];
         if (byteIndex < currentFile.size) {
             const endpoint = Math.min(byteIndex+FILE_CHUNK_SIZE, currentFile.size);
@@ -287,7 +295,7 @@ function sendData() {
         } else {
             fileIndex += 1;
             byteIndex = 0;
-        sendData();
+        }
     }
 }