/// <summary>
/// Creates a new outgoing connection.
/// </summary>
/// <remarks>
/// <para>When establishing a connection two DIDs are required, one for the sender identity (who is
/// initiating the connection) and the other for the receiver identity (who the connection is being
/// established with).
/// </para>
/// <para>The <see cref="Wallet"/> provided when creating the connection must contain information about
/// the sender identity which must have been added using the <see cref="Signus.CreateAndStoreMyDidAsync(Wallet, string)"/>
/// method prior to attempting to create the connection.
/// </para>
/// <para>The identity information for the receiver can also be stored in the wallet using
/// the <see cref="Signus.StoreTheirDidAsync(Wallet, string)"/> method, however if no record is
/// present in the wallet the identity information will be established from the ledger in the
/// provided node <see cref="Pool"/> and will automatically be cached in the provided wallet.
/// </para>
/// </remarks>
/// <seealso cref="Pool"/>
/// <seealso cref="Wallet"/>
/// <seealso cref="Signus"/>
/// <param name="pool">The node pool that the destination DID is registered on.</param>
/// <param name="wallet">The wallet containing the sender (and optionally receiver) DID.</param>
/// <param name="senderDid">The DID of the identity imitating the connection.</param>
/// <param name="receiverDid">The DID of the identity the connection is to be established with.</param>
/// <returns>An asynchronous <see cref="Task{T}"/> that resolves to an AgentConnection instance
/// when the connection has been established.</returns>
public static Task <AgentConnection> ConnectAsync(Pool pool, Wallet wallet, string senderDid, string receiverDid)
{
ParamGuard.NotNull(pool, "pool");
ParamGuard.NotNull(wallet, "wallet");
ParamGuard.NotNullOrWhiteSpace(senderDid, "senderDid");
ParamGuard.NotNullOrWhiteSpace(receiverDid, "receiverDid");
var connection = new AgentConnection();
var taskCompletionSource = new TaskCompletionSource <AgentConnection>(connection);
var commandHandle = PendingCommands.Add(taskCompletionSource);
var result = IndyNativeMethods.indy_agent_connect(
commandHandle,
pool.Handle,
wallet.Handle,
senderDid,
receiverDid,
_connectionEstablishedCallback,
connection.MessageReceivedCallback);
CallbackHelper.CheckResult(result);
return(taskCompletionSource.Task);
}
/// <summary>
/// Initializes a new AgentConnectionEvent.
/// </summary>
/// <param name="listener">The listener the connection was established on.</param>
/// <param name="result">The result of the opening the connection.</param>
/// <param name="connection">The connection.</param>
/// <param name="senderDid">The DID of the sender.</param>
/// <param name="receiverDid">The DID of the receiver.</param>
internal AgentConnectionEvent(AgentListener listener, ErrorCode result, AgentConnection connection, string senderDid, string receiverDid) :
base(listener.Handle, result)
{
Listener = listener ?? throw new ArgumentNullException("listener");
Connection = connection ?? throw new ArgumentNullException("connection");;
SenderDid = senderDid;
ReceiverDid = receiverDid;
}
/// <summary>
/// Callback to use when am incoming connection is established to a listener.
/// </summary>
private void ConnectionEstablishedHandler(IntPtr listener_handle, int err, IntPtr connection_handle, string sender_did, string receiver_did)
{
Debug.Assert(!_connections.ContainsKey(connection_handle));
var connection = new AgentConnection(connection_handle);
_connections.Add(connection_handle, connection);
_events.Add(new AgentConnectionEvent(this, (ErrorCode)err, connection, sender_did, receiver_did));
NotifyEventWaiters();
}
/// <summary>
/// Initializes a new AgentMessageEvent.
/// </summary>
/// <param name="connection">The connection the message was received on.</param>
/// <param name="result">The result of receiving the message.</param>
/// <param name="message">The message.</param>
internal AgentMessageEvent(AgentConnection connection, ErrorCode result, string message) :
base(connection.Handle, result)
{
Connection = connection ?? throw new ArgumentNullException("connection");
Message = message ?? throw new ArgumentNullException("message");
}