MacOS 10.14.6 Mojave.
Node v10.15.3
LocalStack - docker image 0.10.4

When invoking a Lambda from Node.js code.


    const lambda = new Aws.Lambda(creds);
    
    const payload = {};
    
    const clientContext = {
        invokedFunctionArn: this._workerArn
    };
    
    const params = {
        FunctionName: this._workerArn,
        InvocationType: "RequestResponse", // "DryRun",
        LogType: 'Tail', // "None", "Tail"
        ClientContext: JSON.stringify(clientContext),
        Payload: JSON.stringify(payload)
    };
    
    console.log(`DEBUG: Executing lambda ${JSON.stringify(params)}`);
    
    lambda.invoke(params, function (err, data) {
        console.log(`DEBUG: Printing lambda return arguments`);
        console.log(JSON.stringify(arguments));
        console.log(data.LogResult);
    });```
DEBUG: Printing lambda return arguments
{"0":null,"1":{"StatusCode":200,"Payload":"null"}}
undefined
```

Expecting to see the Lambda execution log in `data.LogResult`, but no such object returned,
yet Localstack Cloudwatch logs recorded the execution logs correctly.


```
EVENTS	75	1570381308926.664	+51733/05/27/[$LATEST]629146bb	START RequestId: dbd86068-78c8-1a62-29ca-9c0a4a8580c3 Version: $LATEST	1570381306039
EVENTS	76	1570381308926.664	+51733/05/27/[$LATEST]629146bb	2019-10-06T17:01:47.924Z	dbd86068-78c8-1a62-29ca-9c0a4a8580c3	INFO	DEBUG: LOCALSTACK_HOSTNAME=172.17.0.1	1570381306520
...
EVENTS	79	1570381308926.664	+51733/05/27/[$LATEST]629146bb	END RequestId: dbd86068-78c8-1a62-29ca-9c0a4a8580c3	1570381307961
EVENTS	80	1570381308926.664	+51733/05/27/[$LATEST]629146bb	REPORT RequestId: dbd86068-78c8-1a62-29ca-9c0a4a8580c3	Duration: 16.05 ms	Billed Duration: 100 ms	Memory Size: 1536 MB	Max Memory Used: 57 MB		1570381308442
```

What I'm missing? Why it doesn't return logs on invoke?

Thanks



┆Issue is synchronized with this [Jira Bug](https://localstack.atlassian.net/browse/LOC-125) by [Unito](https://www.unito.io/learn-more)

handler_function = get_handler_function_from_name(handler_name, runtime=runtime)
        main_file = '%s/%s' % (lambda_cwd, handler_file)
        if CHECK_HANDLER_ON_CREATION and not os.path.exists(main_file):
            
            
            
            if not is_local_mount or not use_docker() or config.LAMBDA_REMOTE_DOCKER:
                file_list = run('cd "%s"; du -d 3 .' % lambda_cwd)
                config_debug = ('Config for local mount, docker, remote: "%s", "%s", "%s"' %
                    (is_local_mount, use_docker(), config.LAMBDA_REMOTE_DOCKER))
                LOG.debug('Lambda archive content:\n%s' % file_list)
                raise ClientError(error_response(
                    'Unable to find handler script (%s) in Lambda archive. %s' % (main_file, config_debug),
                    400, error_type='ValidationError'))
        if runtime.startswith('python') and not use_docker():
            try:
                
                ensure_readable(main_file)
                zip_file_content = load_file(main_file, mode='rb')
                
                lambda_handler = exec_lambda_code(
                    zip_file_content,
                    handler_function=handler_function,
                    lambda_cwd=lambda_cwd,
                    lambda_env=lambda_environment)
            except Exception as e:
                raise ClientError('Unable to get handler function from lambda code.', e)
    add_function_mapping(lambda_name, lambda_handler, lambda_cwd)
    return {'FunctionName': lambda_name}
def do_list_functions():