1 files changed, 119 insertions, 0 deletions
diff --git a/app/javascript/flavours/glitch/util/stream.js b/app/javascript/flavours/glitch/util/stream.js
new file mode 100644
index 000000000..0cb2b228f
--- /dev/null
+++ b/app/javascript/flavours/glitch/util/stream.js
@@ -0,0 +1,119 @@
+import WebSocketClient from '@gamestdio/websocket';
+
+const randomIntUpTo = max => Math.floor(Math.random() * Math.floor(max));
+
+const knownEventTypes = [
+  'update',
+  'delete',
+  'notification',
+  'conversation',
+  'filters_changed',
+];
+
+export function connectStream(path, pollingRefresh = null, callbacks = () => ({ onConnect() {}, onDisconnect() {}, onReceive() {} })) {
+  return (dispatch, getState) => {
+    const streamingAPIBaseURL = getState().getIn(['meta', 'streaming_api_base_url']);
+    const accessToken = getState().getIn(['meta', 'access_token']);
+    const { onConnect, onDisconnect, onReceive } = callbacks(dispatch, getState);
+
+    let polling = null;
+
+    const setupPolling = () => {
+      pollingRefresh(dispatch, () => {
+        polling = setTimeout(() => setupPolling(), 20000 + randomIntUpTo(20000));
+      });
+    };
+
+    const clearPolling = () => {
+      if (polling) {
+        clearTimeout(polling);
+        polling = null;
+      }
+    };
+
+    const subscription = getStream(streamingAPIBaseURL, accessToken, path, {
+      connected () {
+        if (pollingRefresh) {
+          clearPolling();
+        }
+
+        onConnect();
+      },
+
+      disconnected () {
+        if (pollingRefresh) {
+          polling = setTimeout(() => setupPolling(), randomIntUpTo(40000));
+        }
+
+        onDisconnect();
+      },
+
+      received (data) {
+        onReceive(data);
+      },
+
+      reconnected () {
+        if (pollingRefresh) {
+          clearPolling();
+          pollingRefresh(dispatch);
+        }
+
+        onConnect();
+      },
+
+    });
+
+    const disconnect = () => {
+      if (subscription) {
+        subscription.close();
+      }
+
+      clearPolling();
+    };
+
+    return disconnect;
+  };
+}
+
+
+export default function getStream(streamingAPIBaseURL, accessToken, stream, { connected, received, disconnected, reconnected }) {
+  const params = stream.split('&');
+  stream = params.shift();
+
+  if (streamingAPIBaseURL.startsWith('ws')) {
+    params.unshift(`stream=${stream}`);
+    const ws = new WebSocketClient(`${streamingAPIBaseURL}/api/v1/streaming/?${params.join('&')}`, accessToken);
+
+    ws.onopen      = connected;
+    ws.onmessage   = e => received(JSON.parse(e.data));
+    ws.onclose     = disconnected;
+    ws.onreconnect = reconnected;
+
+    return ws;
+  }
+
+  stream = stream.replace(/:/g, '/');
+  params.push(`access_token=${accessToken}`);
+  const es = new EventSource(`${streamingAPIBaseURL}/api/v1/streaming/${stream}?${params.join('&')}`);
+
+  let firstConnect = true;
+  es.onopen = () => {
+    if (firstConnect) {
+      firstConnect = false;
+      connected();
+    } else {
+      reconnected();
+    }
+  };
+  for (let type of knownEventTypes) {
+    es.addEventListener(type, (e) => {
+      received({
+        event: e.type,
+        payload: e.data,
+      });
+    });
+  }
+  es.onerror = disconnected;
+
+  return es;
+};