/// <summary>
/// Helper that sets up a proxy server for us and points it at our local host, 1433 SQL Server.
/// </summary>
/// <returns>
/// The newly created proxy server for our local sql server host.
/// </returns>
/// <remarks>
/// Note that we are not inducing any network delay (the first arg). We coul dchange this if desired.
/// </remarks>
private ProxyServer GetProxyServer()
{
ProxyServer proxy = new ProxyServer(simulatedPacketDelay: 0, simulatedInDelay: true, simulatedOutDelay: true, bufferSize: 8192);
proxy.RemoteEndpoint = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 1433);
return proxy;
}
/// <summary>
/// Helper that provides us with ShardConnections based on the shard map (for the database), but routed through the proxy.
/// </summary>
/// <param name="proxy">The proxy to route the connections through.</param>
/// <returns>
/// The List of {ShardLocation, DbConnection} tuples that we can use to instantiate our multi-shard connection.
/// </returns>
/// <remarks>
/// Since our shards all reside in the local instance we can just point them at a single proxy server. If we were using
/// actual physically distributed shards, then I think we would need a separate proxy for each shard. We could
/// augment these tests to use a separate proxy per shard, if we wanted, in order to be able to simulate
/// a richer variety of failures. For now, we just simulate total failures of all shards.
/// </remarks>
private List<Tuple<ShardLocation, DbConnection>> GetProxyShardConnections(ProxyServer proxy)
{
// We'll do this by looking at our pre-existing connections and working from that.
//
string baseConnString = MultiShardTestUtils.ShardConnectionString.ToString();
List<Tuple<ShardLocation, DbConnection>> rVal = new List<Tuple<ShardLocation, DbConnection>>();
foreach (Shard shard in _shardMap.GetShards())
{
// Location doesn't really matter, so just use the same one.
//
ShardLocation curLoc = shard.Location;
// The connection, however, does matter, so set up a connection
SqlConnectionStringBuilder builder = new SqlConnectionStringBuilder(baseConnString);
builder.DataSource = "localhost," + proxy.LocalPort;
builder.InitialCatalog = curLoc.Database;
SqlConnection curConn = new SqlConnection(builder.ToString());
Tuple<ShardLocation, DbConnection> curTuple = new Tuple<ShardLocation, DbConnection>(curLoc, curConn);
rVal.Add(curTuple);
}
return rVal;
}
/// <summary>
/// Standard constructor
/// </summary>
public ProxyServerConnection(TcpClient incomingConnection, ProxyServer server)
{
IncomingConnection = incomingConnection;
Server = server;
}
