/// <summary>
/// Given an IP address, will create a handshake to the distant node for
/// further communications.
/// </summary>
/// <returns>The created peer</returns>
public async Task <GrpcPeer> DialPeerAsync(DnsEndPoint remoteEndpoint)
{
var client = await CreateClientAsync(remoteEndpoint);
if (client == null)
{
return(null);
}
var handshake = await _handshakeProvider.GetHandshakeAsync();
var handshakeReply = await CallDoHandshakeAsync(client, remoteEndpoint, handshake);
// verify handshake
if (handshakeReply.Error != HandshakeError.HandshakeOk)
{
Logger.LogWarning($"Handshake error: {remoteEndpoint} {handshakeReply.Error}.");
await client.Channel.ShutdownAsync();
return(null);
}
if (await _handshakeProvider.ValidateHandshakeAsync(handshakeReply.Handshake) !=
HandshakeValidationResult.Ok)
{
Logger.LogWarning($"Connect error: {remoteEndpoint} {handshakeReply}.");
await client.Channel.ShutdownAsync();
return(null);
}
var peer = new GrpcPeer(client, remoteEndpoint, new PeerConnectionInfo
{
Pubkey = handshakeReply.Handshake.HandshakeData.Pubkey.ToHex(),
ConnectionTime = TimestampHelper.GetUtcNow(),
ProtocolVersion = handshakeReply.Handshake.HandshakeData.Version,
SessionId = handshakeReply.Handshake.SessionId.ToByteArray(),
IsInbound = false
});
peer.UpdateLastReceivedHandshake(handshakeReply.Handshake);
peer.InboundSessionId = handshake.SessionId.ToByteArray();
peer.UpdateLastSentHandshake(handshake);
return(peer);
}
public async Task <GrpcPeer> DialBackPeerAsync(DnsEndPoint remoteEndpoint, Handshake handshake)
{
var client = CreateClient(remoteEndpoint);
await PingNodeAsync(client, remoteEndpoint);
var peer = new GrpcPeer(client, remoteEndpoint, new PeerConnectionInfo
{
Pubkey = handshake.HandshakeData.Pubkey.ToHex(),
ConnectionTime = TimestampHelper.GetUtcNow(),
SessionId = handshake.SessionId.ToByteArray(),
ProtocolVersion = handshake.HandshakeData.Version,
IsInbound = true
});
peer.UpdateLastReceivedHandshake(handshake);
return(peer);
}
