/// <summary>
/// Executes the given RPC command locally on the client immediately and returns the result.
/// No exception is thrown, but a <see cref="RpcFailure"/> result is set in case of a failure.
/// </summary>
public async Task <RpcCommandResult> ExecuteLocallyNow(RpcCommand command)
{
// Do not run the same command twice. If the command with this ID was already
// executed, return the cached result. If the cache is not available any more, return a
// obsolete function call failure.
if (serverCache.GetCachedResult(command.ID) is RpcCommandResult result)
{
return(result);
}
// Execute the command
try {
var runner = new RpcCommandRunner(clientMethods(), null);
result = await runner.Execute(clientConfig.ClientID, command);
}
catch (Exception ex) {
result = RpcCommandResult.FromFailure(command.ID,
new RpcFailure(RpcFailureType.RemoteException, ex.Message));
}
// Cache result, if there was no network problem
if (false == (result.Failure?.IsNetworkProblem == true))
{
serverCache.CacheResult(result);
}
return(result);
}
/// <summary>
/// Call this method when the client called the "/rpc/push"-endpoint.
/// It executes the given RPC command immediately and returns the result.
/// No exception is thrown, but a <see cref="RpcFailure"/> result is set in case of a failure.
/// </summary>
public async Task <RpcCommandResult> OnClientPush(string clientID, RpcCommand command, RpcCommandRunner runner)
{
// Do not run the same command twice. If the command with this ID was already
// executed, return the cached result. If the cache is not available any more, return a
// obsolete function call failure.
var client = clients.GetClient(clientID, commandBacklog);
if (client.GetCachedResult(command.ID) is RpcCommandResult result)
{
return(result);
}
// Execute the command
try {
result = await runner.Execute(clientID, command);
}
catch (Exception ex) {
result = RpcCommandResult.FromFailure(command.ID,
new RpcFailure(RpcFailureType.RemoteException, ex.Message));
}
// Cache result, if there was no network problem
if (false == (result.Failure?.IsNetworkProblem == true))
{
client.CacheResult(result);
}
return(result);
}