public async void SendFriendRequest(string name)
{
if (IsNameInLocalData(name))
{
Console.WriteLine("SendFriendRequest: Friend already exists in local data");
return;
}
DHParameters newDHParameters = GenerateParameters();
AsymmetricCipherKeyPair newDHKeys = GenerateKeys(newDHParameters);
AddDHParametersToLocalData(name, newDHParameters);
AddKeysToLocalData(name, newDHKeys);
Transaction tx = _gtxClient.NewTransaction(new byte[][] { _gtxPublicKey });
tx.AddOperation("send_friend_request", _gtxPublicKey, name, newDHParameters.G.ToString(), newDHParameters.P.ToString(), GetPublicDHKeyAsStringForName(name));
tx.Sign(_gtxPrivateKey, _gtxPublicKey);
string response = (string)await tx.PostAndWaitConfirmation();
if (!String.IsNullOrEmpty(response))
{
Console.WriteLine("SendFriendRequest: Sending friend request failed: " + response);
}
}
public static async void CreateUser(string name)
{
Transaction tx = gtxClient.NewTransaction(new byte[][] { gtxPublicKey });
tx.AddOperation("create_user", name, gtxPublicKey);
tx.Sign(gtxPrivateKey, gtxPublicKey);
await tx.PostAndWaitConfirmation();
}
public async void DemoTest()
{
var keyPair = PostchainUtil.MakeKeyPair();
var privKey = keyPair["privKey"];
var pubKey = keyPair["pubKey"];
// The lower-level client that can be used for any
// postchain client messages. It only handles binary data.
var rest = new RESTClient("http://localhost:7740/");
// Instead of updateing the BRID each time the Rell code is compiled,
// the blockchain can now be accessed throug its chain_id from the
// run.xml file (<chain name="MyCahin" iid="0">)
var initResult = await rest.InitializeBRIDFromChainID(0);
if (initResult.Error)
{
Console.WriteLine("DemoTest: Cannot connect to blockchain!");
return;
}
// Create an instance of the higher-level gtx client. It will
// use the rest client instance
var gtx = new GTXClient(rest);
// Start a new request. A request instance is created.
// The public keys are the keys that must sign the request
// before sending it to postchain. Can be empty.
var req = gtx.NewTransaction(new byte[][] { pubKey });
req.AddOperation("insert_city", "Hamburg", 22222);
req.AddOperation("create_user", pubKey, "Peter");
// Since transactions with the same operations will result in the same txid,
// transactions can contain "nop" operations. This is needed to satisfy
// the unique txid constraint of the postchain.
req.AddOperation("nop", new Random().Next());
req.Sign(privKey, pubKey);
var result = await req.PostAndWaitConfirmation();
if (result.Error)
{
Console.WriteLine("DemoTest Operation failed: " + result.ErrorMessage);
}
// The expected return type has to be passed to the query function. This
// also works with complex types (i.e. your own struct as well as lists).
// The returned tuple will consist of (content, control). The content is of
// the type you pass the function. The control struct contains an error flag
// as well as the error message.
var queryResult = await gtx.Query <int>("get_city", ("name", "Hamburg"));
if (queryResult.control.Error)
{
Console.WriteLine("DemoTest city query error: " + queryResult.control.ErrorMessage);
}
else
{
int plz = queryResult.content;
Console.WriteLine("DemoTest ZIP Query: " + plz);
}
// Same as above with the exception that byte arrays will be returned as strings.
// To convert it to a byte array, use the util function Util.HexStringToBuffer()
// in the Chromia.Postchain.Client.GTX namespace.
var queryResult2 = await gtx.Query <string>("get_user_pubkey", ("name", "Peter"));
if (queryResult2.control.Error)
{
Console.WriteLine("DemoTest userquery error: " + queryResult2.control.ErrorMessage);
}
else
{
string queryPubkeyString = queryResult2.content;
byte[] queryPubkey = PostchainUtil.HexStringToBuffer(queryPubkeyString);
Console.WriteLine("DemoTest User Query: " + PostchainUtil.ByteArrayToString(queryPubkey));
}
}