diagnose: surface missing method details for ticket history

F4SDM42WebApi/F4SDM42WebApiController.cs

@@ -5,6 +5,7 @@ using System.Linq;
 using System.Net;
 using System.Net.Http;
 using System.Reflection;
+using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
 
@@ -140,7 +141,80 @@ namespace C4IT.F4SD
         [Route("getTicketHistory"), HttpGet]
         public async Task<List<cTicketJournalItem>> getTicketHistory(Guid objectId)
         {
-            return await _f4stHelperService.GetJournalEntries(objectId);
+            try
+            {
+                return await _f4stHelperService.GetJournalEntries(objectId);
+            }
+            catch (MissingMethodException ex)
+            {
+                return CreateMissingMethodDiagnostics("getTicketHistory controller", objectId, ex);
+            }
+        }
+
+        internal static List<cTicketJournalItem> CreateMissingMethodDiagnostics(string stage, Guid objectId, MissingMethodException ex)
+        {
+            var details = BuildMissingMethodDiagnostic(stage, objectId, ex);
+            LogEntry(details, LogLevels.Warning);
+
+            return new List<cTicketJournalItem>
+            {
+                new cTicketJournalItem
+                {
+                    ActivityObjectId = objectId,
+                    CreatedBy = "C4ITF4SDM42WebApi",
+                    CreationDate = DateTime.Now,
+                    Header = "MissingMethodException diagnostic",
+                    Description = details,
+                    DescriptionHtml = WebUtility.HtmlEncode(details).Replace(Environment.NewLine, "<br />"),
+                    IsVisibleForUser = false
+                }
+            };
+        }
+
+        private static string BuildMissingMethodDiagnostic(string stage, Guid objectId, MissingMethodException ex)
+        {
+            var builder = new StringBuilder();
+            builder.AppendLine($"Stage: {stage}");
+            builder.AppendLine($"ObjectId: {objectId}");
+            builder.AppendLine(ex.ToString());
+            builder.AppendLine("Loaded assemblies:");
+
+            var assemblyNames = new HashSet<string>(StringComparer.OrdinalIgnoreCase)
+            {
+                "C4ITF4SDM42WebApi",
+                "C4ITF4SDM42WebApiHelper",
+                "Matrix42.Common",
+                "Matrix42.Common.Html",
+                "Matrix42.Contracts.Platform",
+                "Matrix42.Contracts.ServiceManagement",
+                "Matrix42.ServiceManager.BizLogic",
+                "Matrix42.BizLogic.Journal",
+                "Newtonsoft.Json",
+                "System.Net.Http.Formatting",
+                "update4u.SPS.DataLayer",
+                "update4u.SPS.Security"
+            };
+
+            foreach (var assembly in AppDomain.CurrentDomain.GetAssemblies()
+                .Where(assembly => assemblyNames.Contains(assembly.GetName().Name))
+                .OrderBy(assembly => assembly.GetName().Name))
+            {
+                builder.AppendLine($"{assembly.GetName().Name}, Version={assembly.GetName().Version}, Location={GetAssemblyLocation(assembly)}");
+            }
+
+            return builder.ToString();
+        }
+
+        private static string GetAssemblyLocation(Assembly assembly)
+        {
+            try
+            {
+                return assembly.Location;
+            }
+            catch
+            {
+                return string.Empty;
+            }
         }
 
         [Route("getTicketOverviewCounts"), HttpGet]