86 lines
3.1 KiB
C
86 lines
3.1 KiB
C
|
/*
|
||
|
|
* Copyright 2021 The WebRTC Project Authors. All rights reserved.
|
||
|
|
*
|
||
|
|
* Use of this source code is governed by a BSD-style license
|
||
|
|
* that can be found in the LICENSE file in the root of the source
|
||
|
|
* tree. An additional intellectual property rights grant can be found
|
||
|
|
* in the file PATENTS. All contributing project authors may
|
||
|
|
* be found in the AUTHORS file in the root of the source tree.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef API_ASYNC_DNS_RESOLVER_H_
|
||
|
|
#define API_ASYNC_DNS_RESOLVER_H_
|
||
|
|
|
||
|
|
#include <memory>
|
||
|
|
|
||
|
|
#include "rtc_base/socket_address.h"
|
||
|
|
#include "rtc_base/system/rtc_export.h"
|
||
|
|
|
||
|
|
namespace webrtc {
|
||
|
|
|
||
|
|
// This interface defines the methods to resolve a hostname asynchronously.
|
||
|
|
// The AsyncDnsResolverInterface class encapsulates a single name query.
|
||
|
|
//
|
||
|
|
// Usage:
|
||
|
|
// std::unique_ptr<AsyncDnsResolverInterface> resolver =
|
||
|
|
// factory->Create(address-to-be-resolved, [r = resolver.get()]() {
|
||
|
|
// if (r->result.GetResolvedAddress(AF_INET, &addr) {
|
||
|
|
// // success
|
||
|
|
// } else {
|
||
|
|
// // failure
|
||
|
|
// error = r->result().GetError();
|
||
|
|
// }
|
||
|
|
// // Release resolver.
|
||
|
|
// resolver_list.erase(std::remove_if(resolver_list.begin(),
|
||
|
|
// resolver_list.end(),
|
||
|
|
// [](refptr) { refptr.get() == r; });
|
||
|
|
// });
|
||
|
|
// resolver_list.push_back(std::move(resolver));
|
||
|
|
|
||
|
|
class AsyncDnsResolverResult {
|
||
|
|
public:
|
||
|
|
virtual ~AsyncDnsResolverResult() = default;
|
||
|
|
// Returns true iff the address from |Start| was successfully resolved.
|
||
|
|
// If the address was successfully resolved, sets |addr| to a copy of the
|
||
|
|
// address from |Start| with the IP address set to the top most resolved
|
||
|
|
// address of |family| (|addr| will have both hostname and the resolved ip).
|
||
|
|
virtual bool GetResolvedAddress(int family,
|
||
|
|
rtc::SocketAddress* addr) const = 0;
|
||
|
|
// Returns error from resolver.
|
||
|
|
virtual int GetError() const = 0;
|
||
|
|
};
|
||
|
|
|
||
|
|
class RTC_EXPORT AsyncDnsResolverInterface {
|
||
|
|
public:
|
||
|
|
virtual ~AsyncDnsResolverInterface() = default;
|
||
|
|
|
||
|
|
// Start address resolution of the hostname in |addr|.
|
||
|
|
virtual void Start(const rtc::SocketAddress& addr,
|
||
|
|
std::function<void()> callback) = 0;
|
||
|
|
virtual const AsyncDnsResolverResult& result() const = 0;
|
||
|
|
};
|
||
|
|
|
||
|
|
// An abstract factory for creating AsyncDnsResolverInterfaces. This allows
|
||
|
|
// client applications to provide WebRTC with their own mechanism for
|
||
|
|
// performing DNS resolution.
|
||
|
|
class AsyncDnsResolverFactoryInterface {
|
||
|
|
public:
|
||
|
|
virtual ~AsyncDnsResolverFactoryInterface() = default;
|
||
|
|
|
||
|
|
// Creates an AsyncDnsResolver and starts resolving the name. The callback
|
||
|
|
// will be called when resolution is finished.
|
||
|
|
// The callback will be called on the thread that the caller runs on.
|
||
|
|
virtual std::unique_ptr<webrtc::AsyncDnsResolverInterface> CreateAndResolve(
|
||
|
|
const rtc::SocketAddress& addr,
|
||
|
|
std::function<void()> callback) = 0;
|
||
|
|
// Creates an AsyncDnsResolver and does not start it.
|
||
|
|
// For backwards compatibility, will be deprecated and removed.
|
||
|
|
// One has to do a separate Start() call on the
|
||
|
|
// resolver to start name resolution.
|
||
|
|
virtual std::unique_ptr<webrtc::AsyncDnsResolverInterface> Create() = 0;
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace webrtc
|
||
|
|
|
||
|
|
#endif // API_ASYNC_DNS_RESOLVER_H_
|