Improve long running operation debug log (Azure#13612)

* listen to polling event and print req/res

* try catch to be compatible with old gen modules

* Update ChangeLog.md

Author: isra-fel

src/Accounts/Accounts/ChangeLog.md

@@ -18,6 +18,7 @@
         - Additional information about change #1
 -->
 ## Upcoming Release
+* Improved debug log of long running operations in generated modules
 
 ## Version 2.2.2
 * Managed to parse ExpiresOn time from raw token if could not get from underlying library

src/Accounts/Accounts/CommonModule/AzModule.cs

@@ -110,6 +110,9 @@ public async Task EventListener(string id, CancellationToken cancellationToken,
                 case Events.ResponseCreated:
                     await OnResponseCreated(id, cancellationToken, getEventData, signal, processRecordId);
                     break;
+                case Events.Polling:
+                    await OnPolling(id, cancellationToken, getEventData, signal, processRecordId);
+                    break;
                 default:
                     getEventData.Print(signal, cancellationToken, Events.Information, id);
                     break;
@@ -142,6 +145,33 @@ await signal(Events.Debug, cancellationToken,
             }
         }
 
+        internal async Task OnPolling(string id, CancellationToken cancellationToken, GetEventData getEventData, SignalDelegate signal, string processRecordId)
+        {
+            var data = EventDataConverter.ConvertFrom(getEventData());
+            // a polling event contains a response, and the response contains the request
+            // so we can print them both in one event
+            if (data?.RequestMessage is HttpRequestMessage request)
+            {
+                try {
+                    // Print formatted request message
+                    await signal(Events.Debug, cancellationToken,
+                        () => EventHelper.CreateLogEvent(GeneralUtilities.GetLog(request)));
+                } catch {
+                    // request was disposed, ignore
+                }
+            }
+            if (data?.ResponseMessage is HttpResponseMessage response)
+            {
+                try {
+                // Print formatted response message
+                await signal(Events.Debug, cancellationToken,
+                    () => EventHelper.CreateLogEvent(GeneralUtilities.GetLog(response)));
+                } catch {
+                    // response was disposed, ignore
+                }
+            }
+        }
+
         internal async Task OnCmdletException(string id, CancellationToken cancellationToken, GetEventData getEventData, SignalDelegate signal, string processRecordId, Exception exception)
         {
             var data = EventDataConverter.ConvertFrom(getEventData());