Pdf Import Rewrite

Pdf Import rewritten to greatly improve QR Code detection, reduce
reliance on iTextSharp and improve thumbnails. Fixes #50

Disco.Services/Documents/AttachmentImport/ImporterJob.cs

@@ -0,0 +1,92 @@
+using Disco.Data.Repository;
+using Exceptionless;
+using Quartz;
+using Quartz.Impl.Triggers;
+using System;
+using System.IO;
+
+namespace Disco.Services.Documents.AttachmentImport
+{
+    [PersistJobDataAfterExecution]
+    public class ImporterJob : IJob
+    {
+        public void Execute(IJobExecutionContext context)
+        {
+            var sessionId = context.JobDetail.JobDataMap["SessionId"] as string;
+            if (sessionId == null)
+            {
+                sessionId = Guid.NewGuid().ToString();
+                context.JobDetail.JobDataMap["SessionId"] = sessionId;
+            }
+
+            var filename = context.JobDetail.JobDataMap["Filename"] as string;
+            var retryCount = (int)context.JobDetail.JobDataMap["RetryCount"];
+
+            using (DiscoDataContext database = new DiscoDataContext())
+            {
+                try
+                {
+                    DocumentsLog.LogImportStarting(sessionId, Path.GetFileName(filename));
+
+                    // Returns null if unrecoverable error (eg. Not matched document)
+                    Importer.Import(database, sessionId, filename);
+
+                    // Success - Delete File
+                    if (File.Exists(filename))
+                        File.Delete(filename);
+
+                    DocumentsLog.LogImportFinished(sessionId);
+
+                    // All Done - Delete job
+                    context.Scheduler.DeleteJob(context.JobDetail.Key);
+                }
+                catch (FileNotFoundException)
+                {
+                    // File not found - Delete job and don't reschedule
+                    context.Scheduler.DeleteJob(context.JobDetail.Key);
+                    DocumentsLog.LogImportFinished(sessionId);
+                    return;
+                }
+                catch (Exception ex)
+                {
+                    ex.ToExceptionless().Submit();
+
+                    // Retry 18 times (for 3 minutes)
+                    if (retryCount < 18)
+                    {
+                        context.JobDetail.JobDataMap["RetryCount"] = ++retryCount;
+                        DocumentsLog.LogImportWarning(sessionId, string.Format("{0}; Will try again in 10 Seconds", ex.Message));
+                        // Reschedule Job for 10 seconds
+                        var trig = new SimpleTriggerImpl(Guid.NewGuid().ToString(), new DateTimeOffset(DateTime.Now.AddSeconds(10)));
+                        context.Scheduler.RescheduleJob(context.Trigger.Key, trig);
+                    }
+                    else
+                    {
+                        // To Many Errors
+                        DocumentsLog.LogImportError(sessionId, $"To many errors occurred trying to import (SessionId: {sessionId})");
+                        // Move to Errors Folder
+                        if (File.Exists(filename))
+                        {
+                            try
+                            {
+                                var folderError = DataStore.CreateLocation(database, "DocumentDropBox_Errors");
+                                var filenameError = Path.Combine(folderError, Path.GetFileName(filename));
+                                var filenameErrorCount = 0;
+                                while (File.Exists(filenameError))
+                                {
+                                    filenameError = Path.Combine(folderError, $"{Path.GetFileNameWithoutExtension(filename)} ({++filenameErrorCount}){Path.GetExtension(filename)}");
+                                }
+                                File.Move(filename, filenameError);
+                            }
+                            catch
+                            {
+                                // Ignore Errors
+                            }
+                        }
+                        DocumentsLog.LogImportFinished(sessionId);
+                    }
+                }
+            }
+        }
+    }
+}