asynchronous_dns_cache.cpp

00001 /*
00002  * Copyright (c) 2018, ARM Limited, All Rights Reserved
00003  * SPDX-License-Identifier: Apache-2.0
00004  *
00005  * Licensed under the Apache License, Version 2.0 (the "License"); you may
00006  * not use this file except in compliance with the License.
00007  * You may obtain a copy of the License at
00008  *
00009  * http://www.apache.org/licenses/LICENSE-2.0
00010  *
00011  * Unless required by applicable law or agreed to in writing, software
00012  * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
00013  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00014  * See the License for the specific language governing permissions and
00015  * limitations under the License.
00016  */
00017 
00018 #include "mbed.h"
00019 #include "greentea-client/test_env.h"
00020 #include "unity.h"
00021 #include "utest.h"
00022 #include "dns_tests.h"
00023 
00024 using namespace utest::v1;
00025 
00026 namespace {
00027 int ticker_us = 0;
00028 }
00029 
00030 static void test_dns_query_ticker(void)
00031 {
00032     ticker_us += 100;
00033 }
00034 
00035 void ASYNCHRONOUS_DNS_CACHE()
00036 {
00037     rtos::Semaphore semaphore;
00038     dns_application_data data;
00039     data.semaphore = &semaphore;
00040 
00041     Ticker ticker;
00042     ticker.attach_us(&test_dns_query_ticker, 100);
00043 
00044     for (unsigned int i = 0; i < 5; i++) {
00045         int started_us = ticker_us;
00046 
00047         nsapi_error_t err = get_interface()->gethostbyname_async(dns_test_hosts[0],
00048                                                                  mbed::Callback<void(nsapi_error_t, SocketAddress *)>(hostbyname_cb, (void *) &data));
00049         TEST_ASSERT(err >= 0);
00050 
00051         semaphore.wait();
00052 
00053         TEST_ASSERT(data.result == NSAPI_ERROR_OK );
00054         TEST_ASSERT(strlen(data.addr.get_ip_address()) > 1);
00055 
00056         int delay_ms = (ticker_us - started_us) / 1000;
00057 
00058         static int delay_first = delay_ms / 2;
00059         printf("Delays: first: %i, delay_ms: %i\n", delay_first, delay_ms);
00060         // Check that cached accesses are at least twice as fast as the first one
00061         TEST_ASSERT_TRUE(i == 0 || delay_ms <= delay_first);
00062 
00063         printf("DNS: query \"%s\" => \"%s\", time %i ms\n",
00064                dns_test_hosts[0], data.addr.get_ip_address(), delay_ms);
00065     }
00066 }