public DgraphClient(params GrpcChannel[] channels)
{
foreach (var chan in channels)
{
Api.Dgraph.DgraphClient client = new Api.Dgraph.DgraphClient(chan);
dgraphs.Add(client);
}
}
/// <remarks>
/// Pre : <c>channel != null</c> <c>connection != null</c> and
/// this is the channel used to make the connection.
/// </remarks>
public GRPCConnection(Channel channel, Api.Dgraph.DgraphClient connection)
{
Debug.Assert(channel != null);
Debug.Assert(connection != null);
this.channel = channel;
this.connection = connection;
}
/// <remarks>
/// Pre : <c>channel != null</c> <c>connection != null</c> and
/// this is the channel used to make the connection.
/// </remarks>
public GRPCConnection(Channel channel, Api.Dgraph.DgraphClient connection)
{
Debug.Assert(channel != null);
Debug.Assert(connection != null);
this.channel = channel;
this.connection = connection;
LastKnownStatus = Status.DefaultSuccess;
}
/// <summary>Connect on the given address. I don't think this fails??
/// on bad addresses grpc still returns a connection, but will throw
/// exception on use. </summary>
/// <remarks>Pre : <c>!string.IsNullOrEmpty(address)</c>. </remarks>
public virtual bool TryConnect(string address, out IGRPCConnection connection)
{
Debug.Assert(!string.IsNullOrEmpty(address));
try {
Channel channel = new Channel(address, ChannelCredentials.Insecure);
Api.Dgraph.DgraphClient client = new Api.Dgraph.DgraphClient(channel);
connection = new GRPCConnection(channel, client);
return(true);
} catch (RpcException) {
// FIXME: log this. If I ever get this error, then I might
// need to do more here to return that error to the client.
// actually use the error type
}
connection = null;
return(false);
}
