#2623 - Only return response from lambda, skip log output

moto/awslambda/models.py

@@ -53,9 +53,6 @@ try:
 except ImportError:
     from backports.tempfile import TemporaryDirectory
 
-# The lambci container is returning a special escape character for the "RequestID" fields. Unicode 033:
-# _stderr_regex = re.compile(r"START|END|REPORT RequestId: .*")
-_stderr_regex = re.compile(r"\033\[\d+.*")
 _orig_adapter_send = requests.adapters.HTTPAdapter.send
 docker_3 = docker.__version__[0] >= "3"
 
@@ -385,7 +382,7 @@ class LambdaFunction(BaseModel):
         try:
             # TODO: I believe we can keep the container running and feed events as needed
             #       also need to hook it up to the other services so it can make kws/s3 etc calls
-            #  Should get invoke_id /RequestId from invovation
+            #  Should get invoke_id /RequestId from invocation
             env_vars = {
                 "AWS_LAMBDA_FUNCTION_TIMEOUT": self.timeout,
                 "AWS_LAMBDA_FUNCTION_NAME": self.function_name,
@@ -453,14 +450,9 @@ class LambdaFunction(BaseModel):
             if exit_code != 0:
                 raise Exception("lambda invoke failed output: {}".format(output))
 
-            # strip out RequestId lines (TODO: This will return an additional '\n' in the response)
-            output = os.linesep.join(
-                [
-                    line
-                    for line in self.convert(output).splitlines()
-                    if not _stderr_regex.match(line)
-                ]
-            )
+            # We only care about the response from the lambda
+            # Which is the last line of the output, according to https://github.com/lambci/docker-lambda/issues/25
+            output = output.splitlines()[-1]
             return output, False
         except BaseException as e:
             traceback.print_exc()