protected override async Task CopyFromSource(ILogger log, CancellationToken token)
{
if (await _blob.ExistsAsync())
{
log.LogInformation($"GET {_blob.Uri.AbsoluteUri}");
if (File.Exists(LocalCacheFile.FullName))
{
LocalCacheFile.Delete();
}
using (var cache = File.OpenWrite(LocalCacheFile.FullName))
{
await _blob.DownloadToStreamAsync(cache);
}
// If the blob is compressed it needs to be decompressed locally before it can be used
if (_blob.Properties.ContentEncoding?.Equals("gzip", StringComparison.OrdinalIgnoreCase) == true)
{
log.LogInformation($"Decompressing {_blob.Uri.AbsoluteUri}");
var gzipFile = LocalCacheFile.FullName + ".gz";
File.Move(LocalCacheFile.FullName, gzipFile);
using (Stream destination = File.Create(LocalCacheFile.FullName))
using (Stream source = File.OpenRead(gzipFile))
using (Stream zipStream = new GZipStream(source, CompressionMode.Decompress))
{
zipStream.CopyTo(destination);
}
}
}
}
public Task Write(JObject json, ILogger log, CancellationToken token)
{
_downloaded = true;
_hasChanges = true;
if (File.Exists(LocalCacheFile.FullName))
{
LocalCacheFile.Delete();
}
JsonUtility.SaveJson(LocalCacheFile, json);
return(Task.FromResult(true));
}
public Task Write(Stream stream, ILogger log, CancellationToken token)
{
_downloaded = true;
_hasChanges = true;
using (stream)
{
if (File.Exists(LocalCacheFile.FullName))
{
LocalCacheFile.Delete();
}
using (var writeStream = File.OpenWrite(LocalCacheFile.FullName))
{
stream.CopyTo(writeStream);
stream.Seek(0, SeekOrigin.Begin);
}
}
return(Task.FromResult(true));
}
protected override async Task CopyFromSource(ILogger log, CancellationToken token)
{
Uri absoluteUri = UriUtility.GetPath(RootPath, key);
if (!await FileExistsAsync(client, bucketName, key, token).ConfigureAwait(false))
{
return;
}
log.LogInformation($"GET {absoluteUri}");
if (File.Exists(LocalCacheFile.FullName))
{
LocalCacheFile.Delete();
}
string contentEncoding;
using (FileStream cache = File.OpenWrite(LocalCacheFile.FullName))
{
contentEncoding = await DownloadFileAsync(client, bucketName, key, cache, token).ConfigureAwait(false);
}
if (contentEncoding?.Equals("gzip", StringComparison.OrdinalIgnoreCase) == true)
{
log.LogInformation($"Decompressing {absoluteUri}");
string gzipFile = LocalCacheFile.FullName + ".gz";
File.Move(LocalCacheFile.FullName, gzipFile);
using (Stream destination = File.Create(LocalCacheFile.FullName))
using (Stream source = File.OpenRead(gzipFile))
using (Stream zipStream = new GZipStream(source, CompressionMode.Decompress))
{
await zipStream.CopyToAsync(destination, DefaultCopyBufferSize, token).ConfigureAwait(false);
}
}
}