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/* MIT License
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*
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* Copyright (c) The c-ares project and its contributors
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* SPDX-License-Identifier: MIT
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*/
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#ifndef ARES_TEST_AI_H
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#define ARES_TEST_AI_H
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#include <utility>
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#include "gtest/gtest.h"
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#include "gmock/gmock.h"
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#include "ares-test.h"
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namespace ares {
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namespace test {
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class MockChannelTestAI
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: public MockChannelOptsTest,
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public ::testing::WithParamInterface<std::pair<int, bool>> {
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public:
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MockChannelTestAI()
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: MockChannelOptsTest(1, GetParam().first, GetParam().second, nullptr, 0)
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{
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}
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};
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class MockUDPChannelTestAI : public MockChannelOptsTest,
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public ::testing::WithParamInterface<int> {
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public:
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MockUDPChannelTestAI() : MockChannelOptsTest(1, GetParam(), false, nullptr, 0)
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{
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}
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};
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class MockTCPChannelTestAI : public MockChannelOptsTest,
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public ::testing::WithParamInterface<int> {
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public:
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MockTCPChannelTestAI() : MockChannelOptsTest(1, GetParam(), true, nullptr, 0)
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{
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}
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};
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// Test fixture that uses a default channel.
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class DefaultChannelTestAI : public LibraryTest {
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public:
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DefaultChannelTestAI() : channel_(nullptr)
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{
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EXPECT_EQ(ARES_SUCCESS, ares_init(&channel_));
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EXPECT_NE(nullptr, channel_);
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}
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~DefaultChannelTestAI()
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{
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ares_destroy(channel_);
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channel_ = nullptr;
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}
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// Process all pending work on ares-owned file descriptors.
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void Process();
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protected:
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`ares_channel` -> `ares_channel_t *`: don't bury the pointer (#595)
`ares_channel` is defined as `typedef struct ares_channeldata *ares_channel;`. The problem with this, is it embeds the pointer into the typedef, which means an `ares_channel` can never be declared as `const` as if you write `const ares_channel channel`, that expands to `struct ares_channeldata * const ares_channel` and not `const struct ares_channeldata *channel`.
We will now typedef `ares_channel_t` as `typedef struct ares_channeldata ares_channel_t;`, so if you write `const ares_channel_t *channel`, it properly expands to `const struct ares_channeldata *channel`.
We are maintaining the old typedef for API compatibility with existing integrations, and due to typedef expansion this should not even cause any compiler warnings for existing code. There are no ABI implications with this change. I could be convinced to keep existing public functions as `ares_channel` if a sufficient argument exists, but internally we really need make this change for modern best practices.
This change will allow us to internally use `const ares_channel_t *` where appropriate. Whether or not we decide to change any public interfaces to use `const` may require further discussion on if there might be ABI implications (I don't think so, but I'm also not 100% sure what a compiler internally does with `const` when emitting machine code ... I think more likely ABI implications would occur going the opposite direction).
FYI, This PR was done via a combination of sed and clang-format, the only manual code change was the addition of the new typedef, and a couple doc fixes :)
Fix By: Brad House (@bradh352)
1 year ago
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ares_channel_t *channel_;
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};
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} // namespace test
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} // namespace ares
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#endif
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