public ExecutionResponse Execute(ExecutionRequest request)
{
var logger = new LocalLambdaLogger();
var response = new ExecutionResponse();
if (!string.IsNullOrEmpty(request.Function.ErrorMessage))
{
response.Error = request.Function.ErrorMessage;
return(response);
}
try
{
if (!string.IsNullOrEmpty(request.AWSRegion))
{
Environment.SetEnvironmentVariable("AWS_REGION", request.AWSRegion);
}
if (!string.IsNullOrEmpty(request.AWSProfile))
{
Environment.SetEnvironmentVariable("AWS_PROFILE", request.AWSProfile);
}
var context = new LocalLambdaContext()
{
Logger = logger
};
object instance = null;
if (!request.Function.LambdaMethod.IsStatic)
{
instance = Activator.CreateInstance(request.Function.LambdaType);
}
var parameters = BuildParameters(request, context);
// Because a Lambda compute environment never executes more then one event at a time
// create a lock around the execution to match that environment.
lock (EXECUTE_LOCK)
{
using (var wrapper = new ConsoleOutWrapper(logger))
{
var lambdaReturnObject = request.Function.LambdaMethod.Invoke(instance, parameters);
response.Response = ProcessReturn(request, lambdaReturnObject);
}
}
}
catch (TargetInvocationException e)
{
response.Error = GenerateErrorMessage(e.InnerException);
}
catch (Exception e)
{
response.Error = GenerateErrorMessage(e);
}
response.Logs = logger.Buffer;
return(response);
}
public static async Task <string> ProcessReturnAsync(ExecutionRequest request, object lambdaReturnObject)
{
Stream lambdaReturnStream = null;
if (lambdaReturnObject == null)
{
return(null);
}
// If the return was a Task then wait till the task is complete.
if (lambdaReturnObject is Task task)
{
await task;
// Check to see if the Task returns back an object.
if (task.GetType().IsGenericType)
{
var resultProperty = task.GetType().GetProperty("Result", BindingFlags.Public | BindingFlags.Instance);
if (resultProperty != null)
{
var taskResult = resultProperty.GetMethod.Invoke(task, null);
if (taskResult is Stream stream)
{
lambdaReturnStream = stream;
}
else
{
lambdaReturnStream = new MemoryStream();
request.Function.Serializer.Serialize(taskResult, lambdaReturnStream);
}
}
}
}
else
{
lambdaReturnStream = new MemoryStream();
request.Function.Serializer.Serialize(lambdaReturnObject, lambdaReturnStream);
}
if (lambdaReturnStream == null)
{
return(null);
}
lambdaReturnStream.Position = 0;
using (var reader = new StreamReader(lambdaReturnStream))
{
return(reader.ReadToEnd());
}
}
/// <summary>
/// Create the parameter array that will be passed into the Invoke for the Lambda function.
/// </summary>
/// <param name="request"></param>
/// <param name="context"></param>
/// <returns></returns>
/// <exception cref="Exception"></exception>
public static object[] BuildParameters(ExecutionRequest request, ILambdaContext context)
{
var parms = request.Function.LambdaMethod.GetParameters();
var parmValues = new object[parms.Length];
if (parmValues.Length > 2)
{
throw new Exception($".NET Method has too many parameters, {parmValues.Length}. Methods called by Lambda can have at most 2 parameters. The first is the input object and the second is an ILambdaContext.");
}
for (var i = 0; i < parms.Length; i++)
{
if (parms[i].ParameterType == typeof(ILambdaContext))
{
parmValues[i] = context;
}
else
{
var bytes = Encoding.UTF8.GetBytes((request.Payload != null) ? request.Payload : "{}");
var stream = new MemoryStream(bytes);
if (request.Function.Serializer != null)
{
var genericMethodInfo = request.Function.Serializer.GetType()
.GetMethods(BindingFlags.Public | BindingFlags.Instance)
.FirstOrDefault(x => string.Equals(x.Name, "Deserialize"));
var methodInfo = genericMethodInfo.MakeGenericMethod(new Type[] { parms[i].ParameterType });
try
{
parmValues[i] = methodInfo.Invoke(request.Function.Serializer, new object[] { stream });
}
catch (Exception e)
{
throw new Exception($"Error deserializing the input JSON to type {parms[i].ParameterType.Name}", e);
}
}
else
{
parmValues[i] = stream;
}
}
}
return(parmValues);
}
private async Task Loop(CancellationToken token)
{
var aws = this._runtime.AWSService;
while (!token.IsCancellationRequested)
{
Message message = null;
LogRecord logRecord = null;
try
{
// Read a message from the queue using the ExternalCommands console application.
message = await aws.ReadMessageAsync(this._profile, this._region, this._queueUrl);
if (token.IsCancellationRequested)
{
return;
}
if (message == null)
{
// Since there are no messages, sleep a bit to wait for messages to come.
Thread.Sleep(1000);
continue;
}
// If a message was received execute the Lambda function within the test tool.
var request = new ExecutionRequest
{
AWSProfile = this._profile,
AWSRegion = this._region,
Function = this._function,
Payload = message.Body
};
var response = await this._runtime.ExecuteLambdaFunctionAsync(request);
// Capture the results to send back to the client application.
logRecord = new LogRecord
{
ProcessTime = DateTime.Now,
ReceiptHandle = message.ReceiptHandle,
Logs = response.Logs,
Error = response.Error
};
}
catch (Exception e)
{
logRecord = new LogRecord
{
ProcessTime = DateTime.Now,
Error = e.Message
};
Thread.Sleep(1000);
}
if (logRecord != null && message != null)
{
logRecord.Event = message.Body;
}
lock (LOG_LOCK)
{
this._records.Add(logRecord);
}
}
}
/// <summary>
/// Execute the Lambda function.
/// </summary>
/// <param name="request"></param>
/// <returns></returns>
public ExecutionResponse ExecuteLambdaFunction(ExecutionRequest request)
{
return(new LambdaExecutor().Execute(request));
}
/// <summary>
/// Execute the Lambda function.
/// </summary>
/// <param name="request"></param>
/// <returns></returns>
public async Task <ExecutionResponse> ExecuteLambdaFunctionAsync(ExecutionRequest request)
{
return(await(new LambdaExecutor()).ExecuteAsync(request));
}