/// <summary>
/// Find the reflection objects for the code that will be executed for the Lambda function based on the
/// Lambda function handler.
/// </summary>
/// <param name="functionInfo"></param>
/// <returns></returns>
public LambdaFunction LoadLambdaFunction(LambdaFunctionInfo functionInfo)
{
var function = new LambdaFunction(functionInfo);
var handlerTokens = functionInfo.Handler.Split("::");
if (handlerTokens.Length != 3)
{
function.ErrorMessage = $"Invalid format for function handler string {functionInfo.Handler}. Format is <assembly>::<type-name>::<method>.";
return(function);
}
// Using our custom Assembly resolver load the target Assembly.
function.LambdaAssembly = this.Resolver.LoadAssembly(handlerTokens[0]);
if (function.LambdaAssembly == null)
{
function.ErrorMessage = $"Failed to find assembly {handlerTokens[0]}";
return(function);
}
function.LambdaType = function.LambdaAssembly.GetType(handlerTokens[1]);
if (function.LambdaType == null)
{
function.ErrorMessage = $"Failed to find type {handlerTokens[1]}";
return(function);
}
var methodInfos = function.LambdaType.GetMethods(BindingFlags.Public | BindingFlags.Instance | BindingFlags.Static)
.Where(x => string.Equals(x.Name, handlerTokens[2])).ToArray();
if (methodInfos.Length == 1)
{
function.LambdaMethod = methodInfos[0];
}
else
{
// TODO: Handle method overloads
if (methodInfos.Length > 1)
{
function.ErrorMessage = $"More then one method called {handlerTokens[2]} was found. This tool does not currently support method overloading.";
}
else
{
function.ErrorMessage = $"Failed to find method {handlerTokens[2]}";
}
return(function);
}
// Search to see if a Lambda serializer is registered.
var attribute = function.LambdaMethod.GetCustomAttribute(typeof(LambdaSerializerAttribute)) as LambdaSerializerAttribute ??
function.LambdaAssembly.GetCustomAttribute(typeof(LambdaSerializerAttribute)) as LambdaSerializerAttribute;
if (attribute != null)
{
function.Serializer = Activator.CreateInstance(attribute.SerializerType) as ILambdaSerializer;
}
return(function);
}
public DlqMonitor(ILocalLambdaRuntime runtime, LambdaFunction function, string profile, string region, string queueUrl)
{
this._runtime = runtime;
this._function = function;
this._profile = profile;
this._region = region;
this._queueUrl = queueUrl;
}
