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117 lines
4 KiB
C++
117 lines
4 KiB
C++
/*
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* Copyright 2021 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef API_WRAPPING_ASYNC_DNS_RESOLVER_H_
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#define API_WRAPPING_ASYNC_DNS_RESOLVER_H_
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#include <functional>
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#include <memory>
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#include "absl/memory/memory.h"
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#include "api/async_dns_resolver.h"
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#include "api/sequence_checker.h"
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#include "rtc_base/async_resolver.h"
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#include "rtc_base/async_resolver_interface.h"
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#include "rtc_base/checks.h"
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#include "rtc_base/socket_address.h"
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#include "rtc_base/third_party/sigslot/sigslot.h"
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#include "rtc_base/thread_annotations.h"
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// This file defines a DNS resolver that wraps an old-style
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// AsyncResolver.
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// It is part of the conversion to the newer interface, and will go away
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// once conversion is finished.
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// TODO(bugs.webrtc.org/12598): Delete this API.
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namespace webrtc {
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class WrappingAsyncDnsResolver;
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class RTC_EXPORT WrappingAsyncDnsResolverResult
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: public AsyncDnsResolverResult {
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public:
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explicit WrappingAsyncDnsResolverResult(WrappingAsyncDnsResolver* owner)
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: owner_(owner) {}
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~WrappingAsyncDnsResolverResult() {}
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// Note: Inline declaration not possible, since it refers to
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// WrappingAsyncDnsResolver.
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bool GetResolvedAddress(int family, rtc::SocketAddress* addr) const override;
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int GetError() const override;
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private:
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WrappingAsyncDnsResolver* const owner_;
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};
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class RTC_EXPORT WrappingAsyncDnsResolver : public AsyncDnsResolverInterface,
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public sigslot::has_slots<> {
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public:
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explicit WrappingAsyncDnsResolver(rtc::AsyncResolverInterface* wrapped)
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: wrapped_(absl::WrapUnique(wrapped)), result_(this) {}
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~WrappingAsyncDnsResolver() override {
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// Workaround to get around the fact that sigslot-using objects can't be
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// destroyed from within their callback: Alert class users early.
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// TODO(bugs.webrtc.org/12651): Delete this class once the sigslot users are
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// gone.
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RTC_CHECK(!within_resolve_result_);
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wrapped_.release()->Destroy(false);
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}
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void Start(const rtc::SocketAddress& addr,
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std::function<void()> callback) override {
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RTC_DCHECK_RUN_ON(&sequence_checker_);
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RTC_DCHECK_EQ(State::kNotStarted, state_);
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state_ = State::kStarted;
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callback_ = callback;
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wrapped_->SignalDone.connect(this,
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&WrappingAsyncDnsResolver::OnResolveResult);
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wrapped_->Start(addr);
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}
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const AsyncDnsResolverResult& result() const override {
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RTC_DCHECK_RUN_ON(&sequence_checker_);
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RTC_DCHECK_EQ(State::kResolved, state_);
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return result_;
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}
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private:
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enum class State { kNotStarted, kStarted, kResolved };
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friend class WrappingAsyncDnsResolverResult;
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// For use by WrappingAsyncDnsResolverResult
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rtc::AsyncResolverInterface* wrapped() const {
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RTC_DCHECK_RUN_ON(&sequence_checker_);
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return wrapped_.get();
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}
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void OnResolveResult(rtc::AsyncResolverInterface* ref) {
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RTC_DCHECK_RUN_ON(&sequence_checker_);
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RTC_DCHECK(state_ == State::kStarted);
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RTC_DCHECK_EQ(ref, wrapped_.get());
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state_ = State::kResolved;
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within_resolve_result_ = true;
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callback_();
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within_resolve_result_ = false;
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}
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// The class variables need to be accessed on a single thread.
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SequenceChecker sequence_checker_;
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std::function<void()> callback_ RTC_GUARDED_BY(sequence_checker_);
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std::unique_ptr<rtc::AsyncResolverInterface> wrapped_
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RTC_GUARDED_BY(sequence_checker_);
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State state_ RTC_GUARDED_BY(sequence_checker_) = State::kNotStarted;
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WrappingAsyncDnsResolverResult result_ RTC_GUARDED_BY(sequence_checker_);
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bool within_resolve_result_ RTC_GUARDED_BY(sequence_checker_) = false;
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};
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} // namespace webrtc
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#endif // API_WRAPPING_ASYNC_DNS_RESOLVER_H_
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