text: /*
   *
   *    Copyright (c) 2021 Project CHIP Authors
   *    All rights reserved.
   *
   *    Licensed under the Apache License, Version 2.0 (the "License");
   *    you may not use this file except in compliance with the License.
   *    You may obtain a copy of the License at
   *
   *        http://www.apache.org/licenses/LICENSE-2.0
   *
   *    Unless required by applicable law or agreed to in writing, software
   *    distributed under the License is distributed on an "AS IS" BASIS,
   *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   *    See the License for the specific language governing permissions and
   *    limitations under the License.
   */
  
  // set this to 1 to enable DumpCache to see the state of the cache when needed
  // #define MDNS_LOGGING 1
  #include <cstdint>
  #include <iostream>
  #include <nlunit-test.h>
  
  #include <inet/IPAddress.h>
  #include <inet/InetInterface.h>
  #include <inet/InetLayer.h>
  #include <lib/core/CHIPError.h>
  #include <lib/core/PeerId.h>
  #include <lib/dnssd/DnssdCache.h>
  #include <lib/support/UnitTestRegistration.h>
  #include <lib/support/logging/CHIPLogging.h>
  #include <system/SystemTimer.h>
  #include <system/TimeSource.h>
  
  #define NL_TEST_DEF_FN(fn) NL_TEST_DEF("Test " #fn, fn)
  
  using namespace chip;
  using namespace chip::Dnssd;
  
  void TestCreate(nlTestSuite * inSuite, void * inContext)
  {
      DnssdCache<10> tDnssdCache;
      tDnssdCache.DumpCache();
  }
  
  void TestInsert(nlTestSuite * inSuite, void * inContext)
  {
      const int sizeOfCache = 5;
      DnssdCache<sizeOfCache> tDnssdCache;
      PeerId peerId;
      int64_t id                        = 0x100;
      uint16_t port                     = 2000;
      constexpr Inet::InterfaceId iface = INET_NULL_INTERFACEID;
  
      Inet::IPAddress addr;
      Inet::IPAddress addrV6;
      const int ttl = 2; /* seconds */
      Inet::InterfaceId iface_out;
      Inet::IPAddress addr_out;
      uint16_t port_out;
      const uint64_t KNOWN_FABRIC = 0x100;
  
      Inet::IPAddress::FromString("1.0.0.1", addr);
  
      peerId.SetCompressedFabricId(KNOWN_FABRIC);
  
      for (uint16_t i = 0; i < 10; i++)
      {
          CHIP_ERROR result;
  
          // ml -- why doesn't adding 2 uint16_t give a uint16_t?
          peerId.SetNodeId((NodeId) id + i);
          result = tDnssdCache.Insert(peerId, addr, (uint16_t)(port + i), iface, 1000 * ttl);
          if (i < sizeOfCache)
          {
              NL_TEST_ASSERT(inSuite, result == CHIP_NO_ERROR);
          }
          else
          {
              NL_TEST_ASSERT(inSuite, result != CHIP_NO_ERROR);
          }
      }
  
      tDnssdCache.DumpCache();
      usleep(static_cast<useconds_t>((ttl + 1) * 1000 * 1000));
      id   = 0x200;
      port = 3000;
      for (uint16_t i = 0; i < sizeOfCache; i++)
      {
          CHIP_ERROR result;
  
          peerId.SetNodeId((NodeId) id + i);
          result = tDnssdCache.Insert(peerId, addr, (uint16_t)(port + i), iface, 1000 * ttl);
          NL_TEST_ASSERT(inSuite, result == CHIP_NO_ERROR);
      }
      tDnssdCache.DumpCache();
  
      for (uint16_t i = 0; i < sizeOfCache; i++)
      {
          CHIP_ERROR result;
  
          peerId.SetNodeId((NodeId) id + i);
          result = tDnssdCache.Delete(peerId);
          NL_TEST_ASSERT(inSuite, result == CHIP_NO_ERROR);
      }
  
      tDnssdCache.DumpCache();
  
      // ipv6 inserts
      Inet::IPAddress::FromString("::1", addrV6);
      port = 4000;
      for (uint16_t i = 0; i < sizeOfCache; i++)
      {
          CHIP_ERROR result;
  
          peerId.SetNodeId((NodeId) id + i);
          result = tDnssdCache.Insert(peerId, addrV6, (uint16_t)(port + i), iface, 1000 * ttl);
          NL_TEST_ASSERT(inSuite, result == CHIP_NO_ERROR);
      }
  
      tDnssdCache.DumpCache();
  
      NL_TEST_ASSERT(inSuite, tDnssdCache.Lookup(peerId, addr_out, port_out, iface_out) == CHIP_NO_ERROR);
      peerId.SetCompressedFabricId(KNOWN_FABRIC + 1);
      NL_TEST_ASSERT(inSuite, tDnssdCache.Lookup(peerId, addr_out, port_out, iface_out) != CHIP_NO_ERROR);
  }
  
  static const nlTest sTests[] = { NL_TEST_DEF_FN(TestCreate), NL_TEST_DEF_FN(TestInsert), NL_TEST_SENTINEL() };
  
  int TestDnssdCache(void)
  {
      nlTestSuite theSuite = { "MDNS Cache Creation", &sTests[0], nullptr, nullptr };
  
      nlTestRunner(&theSuite, nullptr);
      return nlTestRunnerStats(&theSuite);
  }
  
  CHIP_REGISTER_TEST_SUITE(TestDnssdCache)
  