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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef NET_BASE_TEST_COMPLETION_CALLBACK_H_
#define NET_BASE_TEST_COMPLETION_CALLBACK_H_
#include <stdint.h>
#include <memory>
#include <utility>
#include "base/compiler_specific.h"
#include "base/functional/callback.h"
#include "base/memory/raw_ptr.h"
#include "net/base/completion_once_callback.h"
#include "net/base/net_errors.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
//-----------------------------------------------------------------------------
// completion callback helper
// A helper class for completion callbacks, designed to make it easy to run
// tests involving asynchronous operations. Just call WaitForResult to wait
// for the asynchronous operation to complete. Uses a RunLoop to spin the
// current MessageLoop while waiting. The callback must be invoked on the same
// thread WaitForResult is called on.
//
// NOTE: Since this runs a message loop to wait for the completion callback,
// there could be other side-effects resulting from WaitForResult. For this
// reason, this class is probably not ideal for a general application.
//
namespace base {
class RunLoop;
}
namespace net {
class IOBuffer;
namespace internal {
class TestCompletionCallbackBaseInternal {
public:
TestCompletionCallbackBaseInternal(
const TestCompletionCallbackBaseInternal&) = delete;
TestCompletionCallbackBaseInternal& operator=(
const TestCompletionCallbackBaseInternal&) = delete;
bool have_result() const { return have_result_; }
protected:
TestCompletionCallbackBaseInternal();
virtual ~TestCompletionCallbackBaseInternal();
void DidSetResult();
void WaitForResult();
private:
// RunLoop. Only non-NULL during the call to WaitForResult, so the class is
// reusable.
std::unique_ptr<base::RunLoop> run_loop_;
bool have_result_ = false;
};
template <typename R>
struct NetErrorIsPendingHelper {
bool operator()(R status) const { return status == ERR_IO_PENDING; }
};
template <typename R, typename IsPendingHelper = NetErrorIsPendingHelper<R>>
class TestCompletionCallbackTemplate
: public TestCompletionCallbackBaseInternal {
public:
TestCompletionCallbackTemplate(const TestCompletionCallbackTemplate&) =
delete;
TestCompletionCallbackTemplate& operator=(
const TestCompletionCallbackTemplate&) = delete;
~TestCompletionCallbackTemplate() override = default;
R WaitForResult() {
TestCompletionCallbackBaseInternal::WaitForResult();
return std::move(result_);
}
R GetResult(R result) {
IsPendingHelper check_pending;
if (!check_pending(result))
return std::move(result);
return WaitForResult();
}
protected:
TestCompletionCallbackTemplate() : result_(R()) {}
// Override this method to gain control as the callback is running.
virtual void SetResult(R result) {
result_ = std::move(result);
DidSetResult();
}
private:
R result_;
};
} // namespace internal
class TestClosure : public internal::TestCompletionCallbackBaseInternal {
public:
using internal::TestCompletionCallbackBaseInternal::WaitForResult;
TestClosure() = default;
TestClosure(const TestClosure&) = delete;
TestClosure& operator=(const TestClosure&) = delete;
~TestClosure() override;
base::OnceClosure closure() {
return base::BindOnce(&TestClosure::DidSetResult, base::Unretained(this));
}
};
// Base class overridden by custom implementations of TestCompletionCallback.
typedef internal::TestCompletionCallbackTemplate<int>
TestCompletionCallbackBase;
typedef internal::TestCompletionCallbackTemplate<int64_t>
TestInt64CompletionCallbackBase;
class TestCompletionCallback : public TestCompletionCallbackBase {
public:
TestCompletionCallback() = default;
TestCompletionCallback(const TestCompletionCallback&) = delete;
TestCompletionCallback& operator=(const TestCompletionCallback&) = delete;
~TestCompletionCallback() override;
CompletionOnceCallback callback() {
return base::BindOnce(&TestCompletionCallback::SetResult,
base::Unretained(this));
}
};
class TestInt64CompletionCallback : public TestInt64CompletionCallbackBase {
public:
TestInt64CompletionCallback() = default;
TestInt64CompletionCallback(const TestInt64CompletionCallback&) = delete;
TestInt64CompletionCallback& operator=(const TestInt64CompletionCallback&) =
delete;
~TestInt64CompletionCallback() override;
Int64CompletionOnceCallback callback() {
return base::BindOnce(&TestInt64CompletionCallback::SetResult,
base::Unretained(this));
}
};
// Makes sure that the buffer is not referenced when the callback runs.
class ReleaseBufferCompletionCallback: public TestCompletionCallback {
public:
explicit ReleaseBufferCompletionCallback(IOBuffer* buffer);
ReleaseBufferCompletionCallback(const ReleaseBufferCompletionCallback&) =
delete;
ReleaseBufferCompletionCallback& operator=(
const ReleaseBufferCompletionCallback&) = delete;
~ReleaseBufferCompletionCallback() override;
private:
void SetResult(int result) override;
raw_ptr<IOBuffer, DanglingUntriaged> buffer_;
};
} // namespace net
#endif // NET_BASE_TEST_COMPLETION_CALLBACK_H_
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