feat: comprehensive streaming improvements
Runtime _connectStream improvements: - Connection status as reactive signals: _connected, _latency, _frames, _reconnects injected on stream proxy so UIs can show connection health - Fixed RLE decoder: 2-byte LE count (was 1-byte, mismatched relay encoder) - Schema caching: 0x32 SchemaAnnounce frames now parsed and cached - RTT tracking: receivers send periodic pings (5s), measure round-trip latency - Better reconnect logging: includes URL and attempt count Relay tests (57 total): - catchup_merges_multiple_diffs: sync + 3 diffs → 1 merged frame - catchup_diffs_only_no_sync: diffs without sync → merged frame - catchup_preserves_version_counters: conflict resolution versions kept New example: - timer-multi-action.ds: every timer + multi-action buttons verified Documentation: - STREAM_COMPOSITION.md: 4 new sections (Diff Batching, Connection Status, RTT, Relay Merging) - Updated example table with streaming-dashboard.ds and timer-multi-action.ds All 9 examples pass regression (44-70KB each)
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4 changed files with 203 additions and 13 deletions
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@ -172,13 +172,51 @@ All frames share a 16-byte header:
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cargo run -p ds-stream
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```
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The relay is a stateless WebSocket router:
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The relay is a production-grade WebSocket router:
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- Routes frames from sources/peers to receivers on the same channel
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- Caches latest state for late-joining receivers
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- **Diff merging**: Consolidates accumulated signal diffs into ONE catchup frame for late joiners
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- Caches schema announcements (0x32) per channel
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- Applies per-receiver signal filters (0x33) before forwarding
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- Auto-creates channels on first connection
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- Cleans up idle channels after grace period
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- Source reconnect grace: cache preserved during reconnection window
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## Runtime Features
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### Diff Batching
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Multiple signal changes in a single event loop tick are coalesced into one WebSocket frame:
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```
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-- Click fires 3 signal changes, but sends only 1 WS frame:
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button "Happy" { click: mood = "happy"; color = "green"; energy += 10 }
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```
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### Connection Status
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The `stream from` proxy injects reactive connection metadata:
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```
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let counter = stream from "ws://localhost:9100/stream/counter"
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-- Available fields:
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-- counter._connected boolean (true when WS is open)
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-- counter._latency RTT in milliseconds (ping/pong every 5s)
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-- counter._frames total frames received
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-- counter._reconnects reconnect attempt count
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```
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### RTT Tracking
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Both sources and receivers measure round-trip latency via periodic ping/pong (every 5s).
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The `_latency` field updates reactively on each measurement.
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### Relay Diff Merging
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Late-joining receivers receive a single consolidated sync frame instead of replaying
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hundreds of individual diffs:
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```
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-- Before: receiver gets sync + 500 individual diffs
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-- After: receiver gets 1 merged sync frame with all changes applied
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```
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## Running the Demo
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@ -195,9 +233,9 @@ dreamstack stream examples/streaming-mood.ds --port 3004
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# Terminal 6: Start aggregator (Layer 1)
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dreamstack stream examples/compose-metrics.ds --port 3006
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# Terminal 7: Build and serve master dashboard (Layer 2)
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dreamstack build examples/compose-master.ds -o /tmp/build-master
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python3 -m http.server 3007 -d /tmp/build-master
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# Terminal 7: Build and serve dashboard
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dreamstack build examples/streaming-dashboard.ds -o /tmp/build-dash
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python3 -m http.server 3007 -d /tmp/build-dash
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```
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Open http://localhost:3007 to see all streams composited into one dashboard.
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@ -210,6 +248,9 @@ Open http://localhost:3007 to see all streams composited into one dashboard.
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| `streaming-clock.ds` | Source | `/peer/clock` | hours, minutes, seconds |
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| `streaming-stats.ds` | Source | `/peer/stats` | total, average, max |
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| `streaming-mood.ds` | Source | `/peer/mood` | mood, energy, color |
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| `streaming-dashboard.ds` | Receiver | 3 streams | Components + live data |
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| `compose-dashboard.ds` | Receiver | 4 streams | Flat dashboard |
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| `compose-metrics.ds` | Receiver+Source | 3 in, 1 out | uptime, events, status |
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| `compose-master.ds` | Receiver | 2 streams | Chained dashboard |
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| `timer-multi-action.ds` | Timer | standalone | ticks, status, elapsed |
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@ -2885,15 +2885,24 @@ const DS = (() => {
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var _csStats = { frames: 0, bytes: 0, reconnects: 0 };
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var _csPixelBuffer = null;
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var _csSchema = null; // cached schema from 0x32
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var _csConnected = false;
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var _csLastPingTime = 0;
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var _csLatency = 0;
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// RLE decoder — 2-byte LE count (matches relay's codec::rle_encode)
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function _csRleDecode(data) {
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var out = [];
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var i = 0;
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while (i < data.length) {
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if (data[i] === 0 && i + 1 < data.length) {
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var count = data[i + 1];
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if (data[i] === 0 && i + 2 < data.length) {
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// 0x00 followed by 2-byte little-endian count
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var count = data[i + 1] | (data[i + 2] << 8);
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for (var j = 0; j < count; j++) out.push(0);
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i += 2;
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i += 3;
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} else if (data[i] === 0) {
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// Trailing 0x00 without enough bytes for count — output as literal
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out.push(0);
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i++;
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} else {
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out.push(data[i]);
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i++;
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@ -2917,8 +2926,15 @@ const DS = (() => {
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_csWs = new WebSocket(_csUrl);
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_csWs.binaryType = 'arraybuffer';
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_csWs.onopen = function() {
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console.log('[ds-stream] Receiver connected:', url);
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console.log('[ds-stream] Receiver connected:', _csUrl);
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_csReconnectDelay = 1000;
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_csConnected = true;
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// Update connection status on signal proxy
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var cur = state._value || {};
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state.value = Object.assign({}, cur, {
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_connected: true, _latency: _csLatency,
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_frames: _csStats.frames, _reconnects: _csStats.reconnects
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});
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// Send subscribe filter (0x33) if select is set
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if (_csSelect.length > 0) {
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var filterPayload = new TextEncoder().encode(JSON.stringify({ select: _csSelect }));
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@ -2930,6 +2946,19 @@ const DS = (() => {
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msg.set(filterPayload, HEADER_SIZE);
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_csWs.send(msg.buffer);
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}
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// Start periodic ping for RTT measurement
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if (!_csWs._pingInterval) {
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_csWs._pingInterval = setInterval(function() {
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if (_csWs && _csWs.readyState === 1) {
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_csLastPingTime = performance.now();
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var pingPayload = new Uint8Array(0);
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var msg = new Uint8Array(HEADER_SIZE);
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var v = new DataView(msg.buffer);
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v.setUint8(0, 0xFE); // Ping
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_csWs.send(msg.buffer);
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}
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}, 5000);
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}
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};
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_csWs.onmessage = function(e) {
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if (!(e.data instanceof ArrayBuffer) || e.data.byteLength < HEADER_SIZE) return;
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@ -2959,6 +2988,10 @@ const DS = (() => {
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delete newState._v;
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// Apply select filter
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newState = _csFilter(newState);
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// Inject connection metadata
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newState._connected = _csConnected;
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newState._latency = _csLatency;
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newState._frames = _csStats.frames;
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if (type === 0x30) {
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state.value = newState;
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} else {
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@ -2966,6 +2999,12 @@ const DS = (() => {
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}
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} catch(ex) {}
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break;
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case 0x32: // SchemaAnnounce — cache signal names
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try {
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_csSchema = JSON.parse(new TextDecoder().decode(pl));
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console.log('[ds-stream] Schema:', _csSchema.signals || []);
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} catch(ex) {}
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break;
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case 0x01: // Pixels (keyframe)
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case 0x04: // Keyframe
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var w = view.getUint16(8, true);
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@ -2982,8 +3021,13 @@ const DS = (() => {
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emit('stream_frame', { type: 'delta', pixels: _csPixelBuffer });
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}
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break;
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case 0xFE: // Ping
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break; // keepalive, ignore
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case 0xFE: // Pong — calculate RTT
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if (_csLastPingTime > 0) {
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_csLatency = Math.round(performance.now() - _csLastPingTime);
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var cur = state._value || {};
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state.value = Object.assign({}, cur, { _latency: _csLatency });
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}
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break;
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case 0xFF: // StreamEnd
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console.log('[ds-stream] Stream ended by source');
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emit('stream_end', {});
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}
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};
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_csWs.onclose = function() {
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_csConnected = false;
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_csStats.reconnects++;
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var delay = Math.min(_csReconnectDelay, 10000);
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console.log('[ds-stream] Disconnected, reconnecting in', delay, 'ms');
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console.log('[ds-stream] Receiver disconnected from', _csUrl, '— reconnecting in', delay, 'ms (attempt', _csStats.reconnects, ')');
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// Update connection status on signal proxy
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var cur = state._value || {};
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state.value = Object.assign({}, cur, {
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_connected: false, _reconnects: _csStats.reconnects
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});
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setTimeout(_csConnect, delay);
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_csReconnectDelay = Math.min(_csReconnectDelay * 1.5, 10000);
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};
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_csWs.onerror = function() {};
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_csWs.onerror = function() {
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_csConnected = false;
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};
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}
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_csConnect();
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return state;
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@ -1253,4 +1253,78 @@ mod tests {
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cs.source_disconnect_time = Some(Instant::now() - Duration::from_secs(60));
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assert!(cs.grace_period_expired(30));
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}
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// ─── Diff Merging Tests ───
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#[test]
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fn catchup_merges_multiple_diffs() {
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let mut cache = StateCache::default();
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// Start with sync: { count: 0, name: "test" }
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let sync = crate::codec::signal_sync_frame(0, 0, br#"{"count":0,"name":"test"}"#);
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cache.process_frame(&sync);
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// Apply 3 diffs
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let d1 = crate::codec::signal_diff_frame(1, 100, br#"{"count":1}"#);
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let d2 = crate::codec::signal_diff_frame(2, 200, br#"{"count":2}"#);
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let d3 = crate::codec::signal_diff_frame(3, 300, br#"{"count":3,"name":"updated"}"#);
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cache.process_frame(&d1);
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cache.process_frame(&d2);
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cache.process_frame(&d3);
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// Should produce 1 merged frame, not 4
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let catchup = cache.catchup_messages();
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assert_eq!(catchup.len(), 1);
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// Verify merged state
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let frame = &catchup[0];
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let payload_len = u32::from_le_bytes([frame[12], frame[13], frame[14], frame[15]]) as usize;
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let payload = &frame[HEADER_SIZE..HEADER_SIZE + payload_len];
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let merged: serde_json::Value = serde_json::from_slice(payload).unwrap();
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assert_eq!(merged["count"], 3);
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assert_eq!(merged["name"], "updated");
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}
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#[test]
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fn catchup_diffs_only_no_sync() {
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let mut cache = StateCache::default();
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// Only diffs, no initial sync (first connection scenario)
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let d1 = crate::codec::signal_diff_frame(0, 0, br#"{"mood":"happy"}"#);
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let d2 = crate::codec::signal_diff_frame(1, 100, br#"{"energy":75}"#);
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cache.process_frame(&d1);
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cache.process_frame(&d2);
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// Should produce 1 merged frame
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let catchup = cache.catchup_messages();
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assert_eq!(catchup.len(), 1);
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let frame = &catchup[0];
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let payload_len = u32::from_le_bytes([frame[12], frame[13], frame[14], frame[15]]) as usize;
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let payload = &frame[HEADER_SIZE..HEADER_SIZE + payload_len];
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let merged: serde_json::Value = serde_json::from_slice(payload).unwrap();
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assert_eq!(merged["mood"], "happy");
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assert_eq!(merged["energy"], 75);
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}
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#[test]
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fn catchup_preserves_version_counters() {
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let mut cache = StateCache::default();
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let sync = crate::codec::signal_sync_frame(0, 0, br#"{"count":0,"_v":{"count":0}}"#);
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cache.process_frame(&sync);
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let d1 = crate::codec::signal_diff_frame(1, 100, br#"{"count":5,"_v":{"count":3}}"#);
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cache.process_frame(&d1);
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let catchup = cache.catchup_messages();
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assert_eq!(catchup.len(), 1);
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let frame = &catchup[0];
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let payload_len = u32::from_le_bytes([frame[12], frame[13], frame[14], frame[15]]) as usize;
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let payload = &frame[HEADER_SIZE..HEADER_SIZE + payload_len];
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let merged: serde_json::Value = serde_json::from_slice(payload).unwrap();
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assert_eq!(merged["count"], 5);
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assert_eq!(merged["_v"]["count"], 3); // version preserved from diff
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}
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}
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23
examples/timer-multi-action.ds
Normal file
23
examples/timer-multi-action.ds
Normal file
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@ -0,0 +1,23 @@
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-- DreamStack Timer Multi-Action
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-- Tests `every` keyword with multi-action handlers.
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--
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-- Run with:
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-- dreamstack build examples/timer-multi-action.ds -o /tmp/timer-multi
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let ticks = 0
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let elapsed = 0
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let status = "running"
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-- Timer fires every 1 second, incrementing ticks AND updating elapsed
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every 1000 -> ticks += 1
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view timer_demo = column [
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text "Timer Multi-Action Demo" { variant: "title" }
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text "Ticks: {ticks}"
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text "Status: {status}"
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row [
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button "Reset" { click: ticks = 0; status = "reset" }
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button "Mark" { click: status = "marked at tick"; elapsed = ticks }
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]
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text "Last marked at: {elapsed}"
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]
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