Add Streamdelay integration

src/node/StreamdelayClient.js

@@ -0,0 +1,48 @@
+import EventEmitter from 'events'
+import * as url from 'url'
+import WebSocket from 'ws'
+import ReconnectingWebSocket from 'reconnecting-websocket'
+
+export default class StreamdelayClient extends EventEmitter {
+  constructor({ endpoint, key }) {
+    super()
+    this.endpoint = endpoint
+    this.key = key
+    this.ws = null
+    this.status = null
+  }
+
+  connect() {
+    const wsURL = url.resolve(this.endpoint, `ws?key=${this.key}`)
+    const ws = (this.ws = new ReconnectingWebSocket(wsURL, [], {
+      WebSocket,
+      maxReconnectionDelay: 5000,
+      minReconnectionDelay: 1000 + Math.random() * 500,
+      reconnectionDelayGrowFactor: 1.1,
+    }))
+    ws.addEventListener('open', () => this.emitState())
+    ws.addEventListener('close', () => this.emitState())
+    ws.addEventListener('message', (ev) => {
+      let data
+      try {
+        data = JSON.parse(ev.data)
+      } catch (err) {
+        console.error('invalid JSON from streamdelay:', ev.data)
+        return
+      }
+      this.status = data.status
+      this.emitState()
+    })
+  }
+
+  emitState() {
+    this.emit('state', {
+      isConnected: this.ws.readyState === WebSocket.OPEN,
+      ...this.status,
+    })
+  }
+
+  setCensored(isCensored) {
+    this.ws.send(JSON.stringify({ isCensored }))
+  }
+}