static void Append(Socket sock, string root)
{
var name = sock.Recv(Encoding.UTF8);
var fileName = Path.GetFileName(name) ?? "";
var combine = Path.Combine(root, fileName);
var s = new FileTapeStream(combine);
Console.WriteLine("Append {0}", fileName);
long result = 0;
while (true)
{
var verDat = sock.Recv();
if ((null == verDat) || (verDat.Length == 0))
break;
var version = BitConverter.ToInt64(verDat, 0);
var data = sock.Recv();
var cond = TapeAppendCondition.VersionIs(version);
result = s.TryAppend(data, cond);
if (result != 0)
Console.WriteLine(" " + result);
}
s.UpdateCounter(result);
sock.Send(BitConverter.GetBytes(result));
}
static bool SyncChanges(RemoteTapeStream remote, FileTapeStream source, long knownVersion, string name)
{
try
{
// remote ver
var rVer = remote.GetVersion(name);
if (rVer == -1)
{
Console.WriteLine("Server unavailable: {0}", remote.Address);
return false;
}
if (rVer >= knownVersion)
{
Console.WriteLine("We are up to date");
return true;
}
while (rVer < knownVersion)
{
var diff = knownVersion - rVer;
var change = Math.Min(1000, diff);
Console.WriteLine("Update {0} from {1} to {2}", remote.Address, rVer, rVer + change);
var difference = source.ReadRecords(rVer, (int) change);
// send data in groups
var result = remote.Append(name, difference);
if (result == -1)
{
Console.WriteLine("Server went offline");
return false;
}
rVer += change;
}
Console.WriteLine("Server updates sent");
return true;
}
catch (Exception ex)
{
Console.WriteLine(ex);
return false;
}
}
// active replicator
static void Main(string[] args)
{
if (args.Length == 0)
{
var fp = Assembly.GetEntryAssembly().Location + ".txt";
if (File.Exists(fp))
{
args = File.ReadAllText(fp).Split('|');
}
}
if (args.Length < 3)
{
Console.WriteLine("Usage: {file} {name} {target1} {target2} etc");
Environment.Exit(1);
}
var file = Path.GetFullPath(args[0]);
var name = args[1];
using (var ctx = new Context())
{
var remotes = args.Skip(2).Select(s => new RemoteTapeStream(ctx, s)).ToArray();
var path = Path.GetDirectoryName(file) ?? "";
var e = new ManualResetEventSlim(true);
using (var w = new FileSystemWatcher(path, Path.GetFileName(file + ".ver") ?? ""))
{
var stream = new FileTapeStream(file);
w.Changed += (sender, eventArgs) =>
{
if (eventArgs.ChangeType == WatcherChangeTypes.Changed)
{
e.Set();
}
};
w.EnableRaisingEvents = true;
while (true)
{
e.Wait();
bool allSynced = true;
var knownVersion = GetKnownVersion(file);
foreach (var remote in remotes)
{
var result = SyncChanges(remote, stream, knownVersion, name);
if (!result)
allSynced = false;
}
if (allSynced && knownVersion == GetKnownVersion(file))
{
e.Reset();
}
}
}
}
}
static void Version(Socket sock, string root)
{
var name = sock.Recv(Encoding.UTF8);
var fileName = Path.GetFileName(name) ?? "";
var combine = Path.Combine(root, fileName);
if (!File.Exists(combine))
{
sock.Send(BitConverter.GetBytes(0L));
}
else
{
var s = new FileTapeStream(combine);
sock.Send(BitConverter.GetBytes(s.GetCurrentVersion()));
}
}
