示例#1
0
        private async Task ApplyEdit(PackageEdit edit)
        {
            string originalPath = null;

            try
            {
                TempDirectory = Path.Combine(Path.GetTempPath(), "NuGetService", "HandlePackageEdits");
                var directory = Path.Combine(TempDirectory, edit.Id, edit.Version);
                if (!Directory.Exists(directory))
                {
                    Directory.CreateDirectory(directory);
                }

                originalPath = Path.Combine(directory, "original.nupkg");

                var sourceItem = FileStorage.GetFile(edit.Id, edit.Version);
                Trace.TraceInformation($"Name is {sourceItem.Name}, storage uri is {sourceItem.Uri}");

                // Download the original file
                Trace.TraceInformation($"Downloading original copy of {edit.Id} {edit.Version}");
                await FileStorage.DownloadAsync(sourceItem, originalPath);

                Trace.TraceInformation($"Downloaded original copy of {edit.Id} {edit.Version}");

                // Check that a backup exists
                Trace.TraceInformation($"Backing up original copy of {edit.Id} {edit.Version}");
                await FileStorage.BackupAsync(originalPath, edit.Id, edit.Version, edit.Hash);

                Trace.TraceInformation($"Backed up original copy of {edit.Id} {edit.Version}");

                // Update the nupkg manifest with the new metadata
                using (var originalStream = File.Open(originalPath, FileMode.Open, FileAccess.ReadWrite))
                {
                    Trace.TraceInformation($"Rewriting package file for {edit.Id} {edit.Version}");

                    var editActionList = edit.GetEditsAsActionList();
                    NupkgRewriter.RewriteNupkgManifest(originalStream, editActionList);

                    Trace.TraceInformation($"Rewrote package file for {edit.Id} {edit.Version}");
                }

                // Snapshot the original blob
                Trace.TraceInformation($"Snapshotting original blob for {edit.Id} {edit.Version} ({sourceItem.Uri.AbsoluteUri}).");
                var snapshot = await FileStorage.SnapshotService.CreateSnapshot(sourceItem);

                Trace.TraceInformation($"Snapshotted original blob for {edit.Id} {edit.Version} ({sourceItem.Uri.AbsoluteUri}).");

                // Upload the updated file
                Trace.TraceInformation($"Uploading modified package file for {edit.Id} {edit.Version} to {sourceItem.Uri.AbsoluteUri}");
                await FileStorage.UploadAsync(sourceItem, originalPath);

                Trace.TraceInformation($"Uploaded modified package file for {edit.Id} {edit.Version} to {sourceItem.Uri.AbsoluteUri}");

                // Calculate new size and hash
                string hash;
                long   size;
                using (var originalStream = File.OpenRead(originalPath))
                {
                    size = originalStream.Length;

                    var hashAlgorithm = HashAlgorithm.Create(HashAlgorithmName);
                    hash = Convert.ToBase64String(
                        hashAlgorithm.ComputeHash(originalStream));
                }

                // Update the database
                try
                {
                    Trace.TraceInformation($"Updating package record for {edit.Id} {edit.Version}");
                    await UpdateDatabaseWithEdit(edit, hash, size);

                    Trace.TraceInformation($"Updated package record for {edit.Id} {edit.Version}");
                }
                catch (Exception exception)
                {
                    // Error occurred while updaing database, roll back the blob to the snapshot
                    // Can't do "await" in a catch block, but this should be pretty quick since it just starts the copy
                    Trace.TraceError($"Failed to update database! {exception}");
                    Trace.TraceWarning(
                        $"Rolling back updated blob for {edit.Id} {edit.Version}. Copying snapshot {snapshot.Uri.AbsoluteUri} to {sourceItem.Uri.AbsoluteUri}");
                    FileStorage.SnapshotService.RestoreSnapshot(sourceItem, snapshot);
                    Trace.TraceWarning(
                        $"Rolled back updated blob for {edit.Id} {edit.Version}. Copying snapshot {snapshot.Uri.AbsoluteUri} to {sourceItem.Uri.AbsoluteUri}");

                    throw;
                }

                Trace.TraceInformation("Deleting snapshot blob {2} for {0} {1}.", edit.Id, edit.Version, snapshot.Uri.AbsoluteUri);
                await FileStorage.SnapshotService.DeleteSnapshotAsync(snapshot);

                Trace.TraceInformation("Deleted snapshot blob {2} for {0} {1}.", edit.Id, edit.Version, snapshot.Uri.AbsoluteUri);
            }
            finally
            {
                if (!string.IsNullOrEmpty(originalPath) && File.Exists(originalPath))
                {
                    File.Delete(originalPath);
                }
            }
        }