While a lambda is still processing (archive unpacking etc), the lambda state should be set to "Pending" (currently "Active") and invocations to that lambda should fail (currently, it can end up in a inconsistent state in this case, like lambdas being executed without layers).

Lambda state should reflect the current internal state, and invocations should fail if not active.
)
@app.route("%s/functions/<function>/aliases/<name>" % API_PATH_ROOT, methods=["DELETE"])
def delete_alias(function, name):
    region = LambdaRegion.get()
    arn = func_arn(function)
    if arn not in region.lambdas:
        return not_found_error(arn)
    lambda_details = region.lambdas.get(arn)
    if name not in lambda_details.aliases:
        return not_found_error(msg="Alias not found: %s:%s" % (arn, name))
    lambda_details.aliases.pop(name)
    return jsonify({})
@app.route("/<version>/functions/<function>/concurrency", methods=["GET", "PUT", "DELETE"])
def function_concurrency(version, function):
    region = LambdaRegion.get()
    
    
    
    arn = func_arn(function)
    lambda_details = region.lambdas.get(arn)
    if not lambda_details:
        return not_found_error(arn)
    if request.method == "GET":
        data = lambda_details.concurrency
    if request.method == "PUT":
        data = json.loads(request.data)
        lambda_details.concurrency = data
    if request.method == "DELETE":
        lambda_details.concurrency = None
        return Response("", status=204)