private void Purge()
{
SiderisDataSet db = Application[database] as SiderisDataSet;
SiderisDataSet.PeerDataTable peers = db.Peer;
string query = String.Format("Expires <= #{0}#",
DateTime.Now);
SiderisDataSet.PeerRow[] rows = peers.Select(query)
as SiderisDataSet.PeerRow[];
if (rows.Length == 0)
{
return;
}
lock (db)
{
foreach (SiderisDataSet.PeerRow row in rows)
{
row.Delete();
}
peers.AcceptChanges();
}
}
public bool Unregister(int port)
{
Purge();
SiderisDataSet db = Application[database] as SiderisDataSet;
SiderisDataSet.PeerDataTable peers = db.Peer;
SiderisDataSet.PeerRow peer;
//
// Find the peer in the database, then delete it.
// Shared files are deleted by the foreign key
// constraint.
//
peer = FindPeer(port);
if (peer != null)
{
lock (db)
{
peer.Delete();
peers.AcceptChanges();
}
return(true);
}
//
// The peer was not in the database anyway.
//
return(false);
}
public bool Ping(int port, out DateTime expires)
{
Purge();
SiderisDataSet db = Application[database] as SiderisDataSet;
SiderisDataSet.PeerDataTable peers = db.Peer;
SiderisDataSet.PeerRow peer;
//
// Find the peer in the database, then update
// the expiry time.
//
peer = FindPeer(port);
if (peer != null)
{
expires = DateTime.Now + TimeSpan.FromMinutes(15);
lock (db)
{
peer.Expires = expires;
peers.AcceptChanges();
}
return(true);
}
//
// The peer was not in the database anyway.
//
expires = DateTime.Now;
return(false);
}
private SiderisDataSet.PeerRow FindPeer(int port)
{
SiderisDataSet db = Application[database] as SiderisDataSet;
SiderisDataSet.PeerDataTable peers = db.Peer;
string address = GetPeerAddress(port);
return(peers.FindByAddress(address));
}
public bool Register(string name, ushort port, File[] shares, out DateTime expires)
{
Purge();
SiderisDataSet db = Application[database] as SiderisDataSet;
SiderisDataSet.PeerDataTable peers = db.Peer;
SiderisDataSet.FileDataTable files = db.File;
SiderisDataSet.PeerRow peer;
//
// If this peer was already in the database,
// remove it. Shared files are removed by the
// foreign key constraint.
//
peer = FindPeer(port);
if (peer != null)
{
lock (db)
{
peer.Delete();
peers.AcceptChanges();
}
}
//
// Compute an expiry date and time for the peer,
// and add it to the database.
//
expires = DateTime.Now + TimeSpan.FromMinutes(15);
string address = GetPeerAddress(port);
lock (db)
{
peer = peers.AddPeerRow(address, expires, name);
//
// Add the files shared by the peer to the database.
//
foreach (File file in shares)
{
files.AddFileRow(peer, file.Hash, file.Size,
file.Name);
}
db.AcceptChanges();
}
SaveData();
return(true);
}
