Back off on presence updates

Previously was sending presence for every timeline event, which means getting 429-d if you are currently receiving a timeline sync.

Author: xurizaemon

src/matrix.mjs

@@ -21,6 +21,21 @@ export default {
       constructor () {
         super(...arguments)
         this.robot.logger.info('Constructor')
+        this.lastPresenceUpdate = 0
+        this.PRESENCE_UPDATE_INTERVAL = 60000 // Minimum 1 minute between updates
+      }
+
+      updatePresence () {
+        const now = Date.now()
+        if (now - this.lastPresenceUpdate >= this.PRESENCE_UPDATE_INTERVAL) {
+          this.robot.matrixClient.setPresence({ presence: 'online' })
+            .catch(err => {
+              if (err.errcode === 'M_LIMIT_EXCEEDED') {
+                this.robot.logger.warn(`Rate limited when setting presence. Retry after: ${err.retry_after_ms}ms`)
+              }
+            })
+          this.lastPresenceUpdate = now
+        }
       }
 
       handleUnknownDevices (err) {
@@ -43,6 +58,7 @@ export default {
       }
 
       send (envelope, ...strings) {
+        this.updatePresence()
         return (() => {
           const result = []
           for (const str of Array.from(strings)) {
@@ -138,6 +154,7 @@ export default {
             switch (state) {
               case 'PREPARED':
                 that.robot.logger.info(`Synced ${that.robot.matrixClient.getRooms().length} rooms`)
+                that.updatePresence()
                 // We really don't want to let people set the display name to something other than the bot
                 // name because the bot only reacts to it's own name.
                 const userId = that.robot.matrixClient.getUserId()
@@ -160,6 +177,9 @@ export default {
               if (name !== userId) {
                 that.robot.logger.info(`Received message: ${JSON.stringify(message)} in room: ${user.room}, from: ${user.name} (${user.id}).`)
                 if (message.msgtype === 'm.text') {
+                  if (message.body.indexOf(that.robot.name) !== -1) {
+                    that.updatePresence()
+                  }
                   that.receive(new TextMessage(user, message.body))
                 }
                 if ((message.msgtype !== 'm.text') || (message.body.indexOf(that.robot.name) !== -1)) {