async Task <Metadata> LoadFile(string path, string destPath, Action <float> progress, CancellationToken token)
{
var session = EnsureLoggedIn();
var uri = FormatUri((DropboxService)session.Service, BaseContentUri, "files/{root}{path}", path);
var request = session.Service.CreateRequest("GET", uri, session.Account);
Response res = await request.GetResponseAsync(token).ConfigureAwait(false);
token.ThrowIfCancellationRequested();
var metadataText = res.Headers ["x-dropbox-metadata"];
var metadata = ParseMetadata(JToken.Parse(metadataText));
const int BufferLength = 16 * 1024;
using (var state = new LoadFileAsyncState {
OutputStream = File.Create(destPath),
ResponseStream = res.GetResponseStream(),
OnProgress = progress,
Metadata = metadata,
TotalBytes = Int64.Parse(res.Headers["Content-Length"]),
Buffer = new byte [BufferLength],
BufferLength = BufferLength
}) {
try {
int readBytes;
do
{
readBytes = await ReadNextChunkAsync(state).ConfigureAwait(false);
token.ThrowIfCancellationRequested();
} while (readBytes > 0);
return(metadata);
} catch {
TryDelete(destPath);
throw;
}
}
}
async Task <int> ReadNextChunkAsync(LoadFileAsyncState state)
{
int bytesRead = await Task.Factory.FromAsync <byte[], int, int, int> (
state.ResponseStream.BeginRead,
state.ResponseStream.EndRead,
state.Buffer, 0, state.BufferLength, null
).ConfigureAwait(false);
if (bytesRead > 0)
{
state.BytesLoaded += bytesRead;
if (state.OnProgress != null)
{
state.OnProgress(((float)state.BytesLoaded) / state.TotalBytes);
}
state.OutputStream.Write(state.Buffer, 0, bytesRead);
}
return(bytesRead);
}
async Task<int> ReadNextChunkAsync (LoadFileAsyncState state)
{
int bytesRead = await Task.Factory.FromAsync<byte[], int, int, int> (
state.ResponseStream.BeginRead,
state.ResponseStream.EndRead,
state.Buffer, 0, state.BufferLength, null
).ConfigureAwait (false);
if (bytesRead > 0) {
state.BytesLoaded += bytesRead;
if (state.OnProgress != null)
state.OnProgress (((float) state.BytesLoaded) / state.TotalBytes);
state.OutputStream.Write (state.Buffer, 0, bytesRead);
}
return bytesRead;
}
async Task<Metadata> LoadFile (string path, string destPath, Action<float> progress, CancellationToken token)
{
var session = EnsureLoggedIn ();
var uri = FormatUri ((DropboxService) session.Service, BaseContentUri, "files/{root}{path}", path);
var request = session.Service.CreateRequest ("GET", uri, session.Account);
Response res = await request.GetResponseAsync (token).ConfigureAwait (false);
token.ThrowIfCancellationRequested ();
var metadataText = res.Headers ["x-dropbox-metadata"];
var metadata = ParseMetadata (JToken.Parse (metadataText));
const int BufferLength = 16 * 1024;
using (var state = new LoadFileAsyncState {
OutputStream = File.Create (destPath),
ResponseStream = res.GetResponseStream (),
OnProgress = progress,
Metadata = metadata,
TotalBytes = Int64.Parse (res.Headers["Content-Length"]),
Buffer = new byte [BufferLength],
BufferLength = BufferLength
}) {
try {
int readBytes;
do {
readBytes = await ReadNextChunkAsync (state).ConfigureAwait (false);
token.ThrowIfCancellationRequested ();
} while (readBytes > 0);
return metadata;
} catch {
TryDelete (destPath);
throw;
}
}
}
