bugfix #30 - outdial race condition for quick caller cancel scenario

lib/utils/place-outdial.js

@@ -109,6 +109,16 @@ class SingleDialer extends Emitter {
       this.ep = await ms.createEndpoint();
       this.logger.debug(`SingleDialer:exec - created endpoint ${this.ep.uuid}`);
 
+      /**
+       * were we killed whilst we were off getting an endpoint ?
+       * https://github.com/jambonz/jambonz-feature-server/issues/30
+       */
+      if (this.killed) {
+        this.logger.info('SingleDialer:exec got quick CANCEL from caller, abort outdial');
+        this.ep.destroy()
+          .catch((err) => this.logger.error({err}, 'Error destroying endpoint'));
+        return;
+      }
       let lastSdp;
       const connectStream = async(remoteSdp) => {
         if (remoteSdp === lastSdp) return;
@@ -210,6 +220,7 @@ class SingleDialer extends Emitter {
    * kill the call in progress or the stable dialog, whichever we have
    */
   async kill() {
+    this.killed = true;
     if (this.inviteInProgress) await this.inviteInProgress.cancel();
     else if (this.dlg && this.dlg.connected) {
       const duration = moment().diff(this.dlg.connectTime, 'seconds');