mirror of
https://github.com/zerotier/ZeroTierOne.git
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119 lines
2.8 KiB
C++
119 lines
2.8 KiB
C++
/*
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* ZeroTier One - Network Virtualization Everywhere
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* Copyright (C) 2011-2016 ZeroTier, Inc. https://www.zerotier.com/
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef ZT_BACKGROUNDRESOLVER_HPP
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#define ZT_BACKGROUNDRESOLVER_HPP
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#include <vector>
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#include <string>
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#include "../node/Constants.hpp"
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#include "../node/Mutex.hpp"
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#include "../node/InetAddress.hpp"
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#include "../node/NonCopyable.hpp"
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#include "Thread.hpp"
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namespace ZeroTier {
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class BackgroundResolverJob;
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/**
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* A simple background resolver
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*/
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class BackgroundResolver : NonCopyable
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{
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friend class BackgroundResolverJob;
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public:
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/**
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* Construct a new resolver
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*
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* resolveNow() must be called to actually initiate background resolution.
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*
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* @param name Name to resolve
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*/
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BackgroundResolver(const char *name);
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~BackgroundResolver();
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/**
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* @return Most recent resolver results or empty vector if none
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*/
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std::vector<InetAddress> get() const;
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/**
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* Launch a background resolve job now
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*
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* If a resolve job is currently in progress, it is aborted and another
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* job is started.
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*
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* Note that jobs can't actually be aborted due to the limitations of the
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* ancient synchronous OS resolver APIs. As a result, in progress jobs
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* that are aborted are simply abandoned. Don't call this too frequently
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* or background threads might pile up.
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*
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* @param callback Callback function to receive notification or NULL if none
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* @praam arg Second argument to callback function
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*/
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void resolveNow(void (*callback)(BackgroundResolver *,void *) = 0,void *arg = 0);
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/**
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* Abort (abandon) any current resolve jobs
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*/
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void abort();
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/**
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* @return True if a background job is in progress
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*/
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inline bool running() const
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{
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Mutex::Lock _l(_lock);
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return (_job != (BackgroundResolverJob *)0);
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}
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/**
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* Wait for pending job to complete (if any)
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*/
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inline void wait() const
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{
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Thread t;
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{
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Mutex::Lock _l(_lock);
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if (!_job)
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return;
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t = _jobThread;
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}
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Thread::join(t);
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}
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private:
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void _postResult(const std::vector<InetAddress> &ips);
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std::string _name;
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BackgroundResolverJob *_job;
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Thread _jobThread;
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void (*_callback)(BackgroundResolver *,void *);
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void *_arg;
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std::vector<InetAddress> _ips;
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Mutex _lock;
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};
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} // namespace ZeroTier
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#endif
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