68 lines
2.0 KiB
C++
68 lines
2.0 KiB
C++
/*
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* IXDNSLookup.h
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* Author: Benjamin Sergeant
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* Copyright (c) 2018 Machine Zone, Inc. All rights reserved.
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*
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* Resolve a hostname+port to a struct addrinfo obtained with getaddrinfo
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* Does this in a background thread so that it can be cancelled, since
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* getaddrinfo is a blocking call, and we don't want to block the main thread on Mobile.
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*/
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#pragma once
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#include "IXCancellationRequest.h"
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#include <string>
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#include <thread>
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#include <atomic>
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#include <condition_variable>
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#include <set>
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struct addrinfo;
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namespace ix
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{
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class DNSLookup {
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public:
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DNSLookup(const std::string& hostname,
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int port,
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int64_t wait = DNSLookup::kDefaultWait);
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~DNSLookup();
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struct addrinfo* resolve(std::string& errMsg,
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const CancellationRequest& isCancellationRequested,
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bool blocking = false);
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private:
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struct addrinfo* resolveAsync(std::string& errMsg,
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const CancellationRequest& isCancellationRequested);
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struct addrinfo* resolveBlocking(std::string& errMsg,
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const CancellationRequest& isCancellationRequested);
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static struct addrinfo* getAddrInfo(std::string hostname,
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int port,
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std::string& errMsg);
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void run(uint64_t id, const std::string& hostname, int port); // thread runner
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std::string _hostname;
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int _port;
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int64_t _wait;
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std::string _errMsg;
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struct addrinfo* _res;
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static std::mutex _resMutex;
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std::atomic<bool> _done;
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std::thread _thread;
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std::condition_variable _condition;
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std::mutex _conditionVariableMutex;
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uint64_t _id;
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static std::atomic<uint64_t> _nextId;
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static std::set<uint64_t> _activeJobs;
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static std::mutex _activeJobsMutex;
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const static int64_t kDefaultWait;
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};
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}
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