private FileNode PreRead(string path)
{
var fullpath = Path.Combine(WorkDir, path);
var fi = new FileInfo(fullpath);
if (fi.Exists)
{
var size = fi.Length;
ulong hash;
if (_masterCon != null)
{
var gw = new StorageClient(_taskName, _masterCon);
var gwSize = gw.GetSize(path);
if (gwSize != size)
{
if (gwSize.HasValue)
fi.Delete();
return null;
}
hash = HashLib.HashFactory.Hash64.CreateMurmur2().ComputeFile(fullpath).GetULong();
var gwHash = gw.GetHash(path);
if (gwHash != hash)
{
if (gwHash.HasValue)
fi.Delete();
return null;
}
}
else
hash = HashLib.HashFactory.Hash64.CreateMurmur2().ComputeFile(fullpath).GetULong();
var n = new FileNode
{
Hash = hash,
Length = fi.Length,
ChangeDate = fi.LastWriteTime
};
_fset.Tree.Add(path, n);
return n;
}
return null;
}
private FileNode Download(string path, bool check = false)
{
if (_masterCon == null)
return null;
var fullpath = Path.Combine(WorkDir, path);
//Debug.Assert(!File.Exists(fullpath));
var gw = new StorageClient(_taskName, _masterCon);
using(var f = File.Create(fullpath, FileNode.MaxCachedSize))
{
long pos = 0;
while (true)
{
byte[] buf = gw.ReadData(path, pos, FileNode.MaxCachedSize);
f.Write(buf, 0, buf.Length);
pos += buf.Length;
if (buf.Length != FileNode.MaxCachedSize)
break;
}
f.Flush();
}
var ret = PreRead(path);
if (check)
{
var len = gw.GetSize(path);
var hs = gw.GetHash(path);
Debug.Assert(len.HasValue && hs.HasValue);
if (ret.Length != len.Value)
throw new Exception("File '" + path + "' corrupted: length");
if (ret.Hash != hs.Value)
throw new Exception("File '" + path + "' corrupted: hash wrong");
}
return ret;
}