86 lines
3.1 KiB
C++
86 lines
3.1 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_ASYNC_DNS_RESOLVER_H_
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#define API_ASYNC_DNS_RESOLVER_H_
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#include <memory>
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#include "rtc_base/socket_address.h"
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#include "rtc_base/system/rtc_export.h"
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namespace webrtc {
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// This interface defines the methods to resolve a hostname asynchronously.
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// The AsyncDnsResolverInterface class encapsulates a single name query.
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//
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// Usage:
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// std::unique_ptr<AsyncDnsResolverInterface> resolver =
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// factory->Create(address-to-be-resolved, [r = resolver.get()]() {
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// if (r->result.GetResolvedAddress(AF_INET, &addr) {
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// // success
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// } else {
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// // failure
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// error = r->result().GetError();
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// }
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// // Release resolver.
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// resolver_list.erase(std::remove_if(resolver_list.begin(),
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// resolver_list.end(),
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// [](refptr) { refptr.get() == r; });
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// });
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// resolver_list.push_back(std::move(resolver));
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class AsyncDnsResolverResult {
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public:
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virtual ~AsyncDnsResolverResult() = default;
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// Returns true iff the address from |Start| was successfully resolved.
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// If the address was successfully resolved, sets |addr| to a copy of the
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// address from |Start| with the IP address set to the top most resolved
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// address of |family| (|addr| will have both hostname and the resolved ip).
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virtual bool GetResolvedAddress(int family,
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rtc::SocketAddress* addr) const = 0;
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// Returns error from resolver.
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virtual int GetError() const = 0;
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};
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class RTC_EXPORT AsyncDnsResolverInterface {
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public:
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virtual ~AsyncDnsResolverInterface() = default;
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// Start address resolution of the hostname in |addr|.
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virtual void Start(const rtc::SocketAddress& addr,
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std::function<void()> callback) = 0;
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virtual const AsyncDnsResolverResult& result() const = 0;
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};
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// An abstract factory for creating AsyncDnsResolverInterfaces. This allows
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// client applications to provide WebRTC with their own mechanism for
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// performing DNS resolution.
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class AsyncDnsResolverFactoryInterface {
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public:
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virtual ~AsyncDnsResolverFactoryInterface() = default;
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// Creates an AsyncDnsResolver and starts resolving the name. The callback
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// will be called when resolution is finished.
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// The callback will be called on the thread that the caller runs on.
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virtual std::unique_ptr<webrtc::AsyncDnsResolverInterface> CreateAndResolve(
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const rtc::SocketAddress& addr,
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std::function<void()> callback) = 0;
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// Creates an AsyncDnsResolver and does not start it.
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// For backwards compatibility, will be deprecated and removed.
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// One has to do a separate Start() call on the
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// resolver to start name resolution.
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virtual std::unique_ptr<webrtc::AsyncDnsResolverInterface> Create() = 0;
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};
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} // namespace webrtc
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#endif // API_ASYNC_DNS_RESOLVER_H_
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