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)

""" This method must be overwritten by subclasses. """
        raise Exception('Not implemented.')
    def startup(self):
        pass
    def cleanup(self, arn=None):
        pass
    def run_lambda_executor(self, cmd, event=None, func_details=None, env_vars={}):
        kwargs = {'stdin': True, 'inherit_env': True, 'asynchronous': True}
        env_vars = env_vars or {}
        is_provided = func_details.runtime.startswith(LAMBDA_RUNTIME_PROVIDED)
        if func_details and is_provided and env_vars.get('DOCKER_LAMBDA_USE_STDIN') == '1':
            
            
            env_updates = {
                'PATH': env_vars.get('PATH') or os.environ.get('PATH', ''),
                'AWS_LAMBDA_EVENT_BODY': to_str(event),
                'DOCKER_LAMBDA_USE_STDIN': '1'
            }
            env_vars.update(env_updates)
            
            env_vars.pop('AWS_LAMBDA_COGNITO_IDENTITY', None)
            event = None
            cmd = re.sub(r'(.*)(%s\s+(run|start))' % self._docker_cmd(), r'\1echo $AWS_LAMBDA_EVENT_BODY | \2', cmd)
        process = run(cmd, env_vars=env_vars, stderr=subprocess.PIPE, outfile=subprocess.PIPE, **kwargs)
        result, log_output = process.communicate(input=event)
        try:
            result = to_str(result).strip()