/// <summary>Initializes a command service.</summary>
/// <param name="client">WOLF client. Required.</param>
/// <param name="options">Commands options that will be used as default when running a command. Required.</param>
/// <param name="services">Services provider that will be used by all commands. Null will cause a backup provider to be used.</param>
/// <param name="log">Logger to log messages and errors to. If null, all logging will be disabled.</param>
/// <param name="cancellationToken">Cancellation token that can be used for cancelling all tasks.</param>
public CommandsService(IWolfClient client, CommandsOptions options, ILogger log, IServiceProvider services = null, CancellationToken cancellationToken = default)
{
// init private
this._commands = new Dictionary <ICommandInstanceDescriptor, ICommandInstance>();
this._lock = new SemaphoreSlim(1, 1);
this._cts = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken);
this._disposableServices = new List <IDisposable>(2);
this._started = false;
// init required
this._client = client ?? services?.GetService <IWolfClient>() ?? throw new ArgumentNullException(nameof(client));
this._options = options ?? services?.GetService <CommandsOptions>() ?? throw new ArgumentNullException(nameof(options));
// init optionals
this._log = log ?? services?.GetService <ILogger <CommandsService> >() ?? services?.GetService <ILogger <ICommandsService> >() ?? services.GetService <ILogger>();
this._argumentConverterProvider = services?.GetService <IArgumentConverterProvider>() ?? CreateAsDisposable <ArgumentConverterProvider>();
this._handlerProvider = services?.GetService <ICommandsHandlerProvider>() ?? CreateAsDisposable <CommandsHandlerProvider>();
this._argumentsParser = services?.GetService <IArgumentsParser>() ?? new ArgumentsParser();
this._parameterBuilder = services?.GetService <IParameterBuilder>() ?? new ParameterBuilder();
this._initializers = services?.GetService <ICommandInitializerProvider>() ?? new CommandInitializerProvider();
this._commandsLoader = services?.GetService <ICommandsLoader>() ?? new CommandsLoader(this._initializers, this._log);
// init service provider - use combine, to use fallback one as well
this._fallbackServices = this.CreateFallbackServiceProvider();
this._services = CombinedServiceProvider.Combine(services, this._fallbackServices);
// register event handlers
this._client.AddMessageListener <ChatMessage>(OnMessageReceived);
}
/// <summary>Attempts to convert argument to parameter type.</summary>
/// <param name="parameter">Parameter to convert argument to.</param>
/// <param name="argIndex">Index of argument.</param>
/// <param name="values">Builder values. Must contain Args and ArgumentConverterProvider.</param>
/// <param name="result">Result of the conversion. Null if conversion failed.</param>
/// <param name="error">Exception that occured when converting. Null if there was no exception.</param>
/// <returns>True if converting was successful; otherwise false.</returns>
protected static bool TryConvertArgument(ParameterInfo parameter, int argIndex, ParameterBuilderValues values, out object result, out Exception error)
{
if (argIndex < 0)
{
throw new ArgumentException("Argument index cannot be negative", nameof(argIndex));
}
if (values == null)
{
throw new ArgumentNullException(nameof(values));
}
error = null;
result = null;
// check if we didn't run out of args
if (values.Args == null || values.Args.Length - 1 < argIndex)
{
return(false);
}
// get from provider
IArgumentConverterProvider provider = values.ArgumentConverterProvider;
IArgumentConverter converter = provider?.GetConverter(parameter);
if (converter == null)
{
return(false);
}
try
{
result = converter.Convert(parameter, values.Args[argIndex]);
return(true);
}
catch (Exception ex)
{
error = ex;
return(false);
}
}
