public APIGatewayProxyResponse FunctionHandler()

in Amazon.QLDB.DMVSample.Api/Functions/AddVehicleRegistrationFunction.cs [57:97]
35 lines of code
3 McCabe index (conditional complexity)

        public APIGatewayProxyResponse FunctionHandler(APIGatewayProxyRequest request, ILambdaContext context)
        {
            VehicleRegistration vehicleRegistration = JsonConvert.DeserializeObject<VehicleRegistration>(request.Body);

            return this.qldbDriver.Execute(transactionExecutor =>
            {
                context.Logger.Log($"Looking for person document ID {vehicleRegistration.Owners?.PrimaryOwner?.PersonId}.");
                string primaryOwnerPersonDocumentId = this.tableMetadataService.GetDocumentId(transactionExecutor, PersonTableName, "GovId", vehicleRegistration.Owners?.PrimaryOwner?.PersonId);
                
                if (string.IsNullOrWhiteSpace(primaryOwnerPersonDocumentId))
                {
                    context.Logger.Log($"No person found with GovId {vehicleRegistration.Owners?.PrimaryOwner?.PersonId}, returning not found.");
                    return new APIGatewayProxyResponse 
                    { 
                        StatusCode = (int)HttpStatusCode.NotFound
                    };
                }

                context.Logger.Log($"Checking vehicle registration already exists for VIN {vehicleRegistration.Vin}.");
                if (CheckIfVinAlreadyExists(transactionExecutor, vehicleRegistration.Vin))
                {
                    context.Logger.Log($"Vehicle registration does exist for VIN {vehicleRegistration.Vin}, returning not modified.");
                    return new APIGatewayProxyResponse 
                    { 
                        StatusCode = (int)HttpStatusCode.NotModified
                    };
                }

                context.Logger.Log($"Inserting vehicle registration for VIN {vehicleRegistration.Vin}.");
                vehicleRegistration.Owners.PrimaryOwner.PersonId = primaryOwnerPersonDocumentId;
                IIonValue ionVehicleRegistration = ConvertObjectToIonValue(vehicleRegistration);

                transactionExecutor.Execute($"INSERT INTO VehicleRegistration ?", ionVehicleRegistration);
                
                context.Logger.Log($"Inserted vehicle registration for VIN {vehicleRegistration.Vin}, returning OK.");
                return new APIGatewayProxyResponse 
                { 
                    StatusCode = (int)HttpStatusCode.OK
                };
            });
        }