remove 'port' when stopped (#3181)

Co-authored-by: Ning Shang <nishang@microsoft.com>

nni/tools/nnictl/config_utils.py

@@ -85,6 +85,9 @@ class Experiments:
             self.experiments = self.read_file()
             if expId not in self.experiments:
                 return False
+            if value is None:
+                self.experiments[expId].pop(key, None)
+            else:
                 self.experiments[expId][key] = value
             self.write_file()
             return True

nni/tools/nnictl/nnictl_utils.py

@@ -54,6 +54,7 @@ def update_experiment():
                 rest_pid = nni_config.get_config('restServerPid')
                 if not detect_process(rest_pid):
                     experiment_config.update_experiment(key, 'status', 'STOPPED')
+                    experiment_config.update_experiment(key, 'port', None)
                     continue
 
 def check_experiment_id(args, update=True):

ts/nni_manager/core/nniExperimentsManager.ts

@@ -77,7 +77,11 @@ class NNIExperimentsManager implements ExperimentManager {
             this.withLockSync(() => {
                 const experimentsInformation = JSON.parse(fs.readFileSync(this.experimentsPath).toString());
                 assert(experimentId in experimentsInformation, `Experiment Manager: Experiment Id ${experimentId} not found, this should not happen`);
+                if (value !== undefined) {
                     experimentsInformation[experimentId][key] = value;
+                } else {
+                    delete experimentsInformation[experimentId][key];
+                }
                 fs.writeFileSync(this.experimentsPath, JSON.stringify(experimentsInformation, null, 4));
             });
         } catch (err) {
@@ -128,6 +132,7 @@ class NNIExperimentsManager implements ExperimentManager {
             updateList.forEach((expId: string) => {
                 if (experimentsInformation[expId]) {
                     experimentsInformation[expId]['status'] = 'STOPPED';
+                    delete experimentsInformation[expId]['port'];
                 } else {
                     this.log.error(`Experiment Manager: Experiment Id ${expId} not found, this should not happen`);
                 }

ts/nni_manager/core/nnimanager.ts

@@ -480,6 +480,7 @@ class NNIManager implements Manager {
         }
         await this.storeExperimentProfile();
         this.setStatus('STOPPED');
+        this.experimentManager.setExperimentInfo(this.experimentProfile.id, 'port', undefined);
     }
 
     private async periodicallyUpdateExecDuration(): Promise<void> {