/// <summary>
/// When overridden in the derived class, handles synchronizing the given version.
/// </summary>
/// <param name="fu">The <see cref="IFileUploader"/> to use.</param>
/// <param name="v">The version to synchronize.</param>
/// <param name="reEnqueue">True if the <paramref name="v"/> should be re-enqueued so it can be re-attempted.
/// If the method throws an <see cref="Exception"/>, the <paramref name="v"/> will be re-enqueued no matter what.</param>
/// <returns>
/// The error string, or null if the synchronization was successful.
/// </returns>
protected override string DoSync(IFileUploader fu, int v, out bool reEnqueue)
{
reEnqueue = false;
// Load the VersionFileList for the version to check
var vflPath = VersionHelper.GetVersionFileListPath(v);
if (!File.Exists(vflPath))
{
// Version doesn't exist at all
return null;
}
var vfl = VersionFileList.CreateFromFile(vflPath);
// Try to download the version's file list hash
var fileListHashPath = GetVersionRemoteFilePath(v, PathHelper.RemoteFileListHashFileName);
var vflHash = fu.DownloadAsString(fileListHashPath);
// Check if the hash file exists on the server
if (vflHash != null)
{
// Check if the hash matches the current version's hash
var expectedVflHash = File.ReadAllText(VersionHelper.GetVersionFileListHashPath(v));
if (vflHash != expectedVflHash)
{
// Delete the whole version folder first
fu.DeleteDirectory(GetVersionRemoteFilePath(v, null));
}
else
{
// Hash existed and was correct - good enough for us!
return null;
}
}
else
{
// Hash didn't exist at all, so we will have to update. As long as SkipIfExists is set to true, files
// that already exist will be skipped, so we will only end up uploading the new files. In any case, its
// the same process either way.
}
// Check the hashes of the local files
foreach (var f in vfl.Files)
{
// Get the local file path
var localPath = VersionHelper.GetVersionFile(v, f.FilePath);
// Confirm the hash of the file
var fileHash = Hasher.GetFileHash(localPath);
if (fileHash != f.Hash)
{
const string errmsg =
"The cached hash ({0}) of file `{1}` does not match the real hash ({2}) for version {3}." +
" Possible version corruption.";
return string.Format(errmsg, f.Hash, f.FilePath, fileHash, v);
}
}
// Hashes check out, start uploading
foreach (var f in vfl.Files)
{
// Get the local file path
var localPath = VersionHelper.GetVersionFile(v, f.FilePath);
var remotePath = GetVersionRemoteFilePath(v, f.FilePath);
fu.UploadAsync(localPath, remotePath);
}
// Wait for uploads to finish
while (fu.IsBusy)
{
Thread.Sleep(1000);
}
// All uploads have finished, so upload the VersionFileList hash
fu.UploadAsync(VersionHelper.GetVersionFileListHashPath(v), fileListHashPath);
// All done! That was easy enough, eh? *sigh*
return null;
}
/// <summary>
/// When overridden in the derived class, handles synchronizing the given version.
/// </summary>
/// <param name="fu">The <see cref="IFileUploader"/> to use.</param>
/// <param name="v">The version to synchronize.</param>
/// <param name="reEnqueue">True if the <paramref name="v"/> should be re-enqueued so it can be re-attempted.
/// If the method throws an <see cref="Exception"/>, the <paramref name="v"/> will be re-enqueued no matter what.</param>
/// <returns>
/// The error string, or null if the synchronization was successful.
/// </returns>
protected override string DoSync(IFileUploader fu, int v, out bool reEnqueue)
{
reEnqueue = false;
// Load the VersionFileList for the version to check
var vflPath = VersionHelper.GetVersionFileListPath(v);
if (!File.Exists(vflPath))
{
// Version doesn't exist at all
return(null);
}
var vfl = VersionFileList.CreateFromFile(vflPath);
// Try to download the version's file list hash
var fileListHashPath = GetVersionRemoteFilePath(v, PathHelper.RemoteFileListHashFileName);
var vflHash = fu.DownloadAsString(fileListHashPath);
// Check if the hash file exists on the server
if (vflHash != null)
{
// Check if the hash matches the current version's hash
var expectedVflHash = File.ReadAllText(VersionHelper.GetVersionFileListHashPath(v));
if (vflHash != expectedVflHash)
{
// Delete the whole version folder first
fu.DeleteDirectory(GetVersionRemoteFilePath(v, null));
}
else
{
// Hash existed and was correct - good enough for us!
return(null);
}
}
else
{
// Hash didn't exist at all, so we will have to update. As long as SkipIfExists is set to true, files
// that already exist will be skipped, so we will only end up uploading the new files. In any case, its
// the same process either way.
}
// Check the hashes of the local files
foreach (var f in vfl.Files)
{
// Get the local file path
var localPath = VersionHelper.GetVersionFile(v, f.FilePath);
// Confirm the hash of the file
var fileHash = Hasher.GetFileHash(localPath);
if (fileHash != f.Hash)
{
const string errmsg =
"The cached hash ({0}) of file `{1}` does not match the real hash ({2}) for version {3}." +
" Possible version corruption.";
return(string.Format(errmsg, f.Hash, f.FilePath, fileHash, v));
}
}
// Hashes check out, start uploading
foreach (var f in vfl.Files)
{
// Get the local file path
var localPath = VersionHelper.GetVersionFile(v, f.FilePath);
var remotePath = GetVersionRemoteFilePath(v, f.FilePath);
fu.UploadAsync(localPath, remotePath);
}
// Wait for uploads to finish
while (fu.IsBusy)
{
Thread.Sleep(1000);
}
// All uploads have finished, so upload the VersionFileList hash
fu.UploadAsync(VersionHelper.GetVersionFileListHashPath(v), fileListHashPath);
// All done! That was easy enough, eh? *sigh*
return(null);
}