clean up some retainers

lib/session/call-session.js

@@ -632,7 +632,7 @@ class CallSession extends Emitter {
     try {
       if (!this.ms) this.ms = this.getMS();
       const ep = await this.ms.createEndpoint({remoteSdp: this.req.body});
-      ep.cs = this;
+      //ep.cs = this;
       this.ep = ep;
       ep.set({
         hangup_after_bridge: false,
@@ -716,14 +716,15 @@ class CallSession extends Emitter {
   /**
    * Hang up the call and free the media endpoint
    */
-  async _clearResources() {
+  _clearResources() {
     for (const resource of [this.dlg, this.ep]) {
-      try {
-        if (resource && resource.connected) await resource.destroy();
-      } catch (err) {
-        this.logger.error(err, 'CallSession:_clearResources error');
+      if (resource && resource.connected) {
+        resource.destroy()
+          .catch((err) => this.logger.error(err, 'CallSession:_clearResources error'));
       }
     }
+    this.dlg = null;
+    this.ep = null;
 
     // remove any temporary tts files that were created (audio is still cached in redis)
     for (const path of this.tmpFiles) {

lib/session/inbound-call-session.js

@@ -21,15 +21,17 @@ class InboundCallSession extends CallSession {
     this.req = req;
     this.res = res;
 
-    req.on('cancel', () => {
-      this._notifyCallStatusChange({callStatus: CallStatus.NoAnswer, sipStatus: 487});
-      this._callReleased();
-    });
+    req.once('cancel', this._onCancel.bind(this));
 
     this.on('callStatusChange', this._notifyCallStatusChange.bind(this));
     this._notifyCallStatusChange({callStatus: CallStatus.Trying, sipStatus: 100});
   }
 
+  _onCancel() {
+    this._notifyCallStatusChange({callStatus: CallStatus.NoAnswer, sipStatus: 487});
+    this._callReleased();
+  }
+
   _onTasksDone() {
     if (!this.res.finalResponseSent) {
       if (this._mediaServerFailure) {
@@ -45,6 +47,7 @@ class InboundCallSession extends CallSession {
         this.res.send(603);
       }
     }
+    this.req.removeAllListeners('cancel');
   }
 
   /**
@@ -56,6 +59,7 @@ class InboundCallSession extends CallSession {
     this.emit('callStatusChange', {callStatus: CallStatus.Completed, duration});
     this.logger.debug('InboundCallSession: caller hung up');
     this._callReleased();
+    this.req.removeAllListeners('cancel');
   }
 }