reusable-streaming (#5709)

app/javascript/mastodon/stream.js

@@ -1,5 +1,66 @@
 import WebSocketClient from 'websocket.js';
 
+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 = () => {
+      polling = setInterval(() => {
+        pollingRefresh(dispatch);
+      }, 20000);
+    };
+
+    const clearPolling = () => {
+      if (polling) {
+        clearInterval(polling);
+        polling = null;
+      }
+    };
+
+    const subscription = getStream(streamingAPIBaseURL, accessToken, path, {
+      connected () {
+        if (pollingRefresh) {
+          clearPolling();
+        }
+        onConnect();
+      },
+
+      disconnected () {
+        if (pollingRefresh) {
+          setupPolling();
+        }
+        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 ws = new WebSocketClient(`${streamingAPIBaseURL}/api/v1/streaming/?access_token=${accessToken}&stream=${stream}`);