public async Task <LockedStream> OpenLockedStreamAsync(string path, FileAccess access)
{
var container = await GetContainerAsync();
var blockBlob = container.GetBlockBlobReference(path);
var blobStream = access == FileAccess.Read
? await blockBlob.OpenReadAsync()
: await blockBlob.OpenWriteAsync();
var result = LockedStream.FromStream(path, blobStream, access, null);
return(result);
}
public override async Task <LockedStream> OpenLockedStreamAsync(string path, FileAccess access)
{
if (access == FileAccess.Read && await ExistsAsync(path))
{
return(await Disk.OpenLockedStreamAsync(path, access));
}
else
{
var lockedStream = await Disk.OpenLockedStreamAsync(path, FileAccess.ReadWrite); //overwrite access to read/write so we can upload online
return(LockedStream.FromStream(path, lockedStream, access, onCloseAction: s =>
{
var(objInfo, compressed) = MapPathToObjectInfo[path];
UploadFileAsync(path, objInfo, compressed, s).Wait();
}));
}
}
public static async Task TestSimple()
{
IDataStore fileInfo = New <IDataStore>(_davidCopperfieldTxtPath);
LockedStream lockedStreamCopy;
using (LockedStream lockedStream = LockedStream.OpenWrite(fileInfo))
{
lockedStreamCopy = lockedStream;
Assert.That(await Task.Run(() => New <FileLocker>().IsLocked(fileInfo)), "The file should be locked now.");
Assert.That(lockedStream.CanRead, "The stream should be readable.");
Assert.That(lockedStream.CanSeek, "The stream should be seekable.");
Assert.That(lockedStream.CanWrite, "The stream should be writeable.");
Assert.That(lockedStream.Length, Is.EqualTo(Resources.david_copperfield.Length), "The length should be the same as the string.");
byte[] b = new byte[1];
int read = lockedStream.Read(b, 0, 1);
Assert.That(read, Is.EqualTo(1), "There should be one byte read.");
Assert.That(b[0], Is.EqualTo(Encoding.UTF8.GetBytes(Resources.david_copperfield.Substring(0, 1))[0]), "The byte read should be the first character of the resource.");
Assert.That(lockedStream.Position, Is.EqualTo(1), "After reading the first byte, the position should be at one.");
lockedStream.Write(b, 0, 1);
lockedStream.Position = 1;
read = lockedStream.Read(b, 0, 1);
Assert.That(read, Is.EqualTo(1), "There should be one byte read.");
Assert.That(b[0], Is.EqualTo(Encoding.UTF8.GetBytes(Resources.david_copperfield.Substring(0, 1))[0]), "The byte read should be the first character of the resource.");
Assert.That(lockedStream.Position, Is.EqualTo(2), "After reading the second byte, the position should be at two.");
lockedStream.Seek(-1, SeekOrigin.End);
Assert.That(lockedStream.Position, Is.EqualTo(lockedStream.Length - 1), "The position should be set by the Seek().");
lockedStream.SetLength(5);
lockedStream.Seek(0, SeekOrigin.End);
Assert.That(lockedStream.Position, Is.EqualTo(5), "After setting the length to 5, seeking to the end should set the position at 5.");
Assert.DoesNotThrow(() => { lockedStream.Flush(); }, "It's hard to test Flush() behavior here, not worth the trouble, but it should not throw!");
}
Assert.That(!await Task.Run(() => New <FileLocker>().IsLocked(fileInfo)), "The file should be unlocked now.");
Assert.Throws <ObjectDisposedException>(() => { lockedStreamCopy.Position = 0; }, "The underlying stream should be disposed.");
}
