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https://github.com/Icinga/icinga2.git
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6aaa35a0a6
There should be more atomic commits but the whole thing was a mess. This commit changes the synchrounous Redis connection into an asynchronous one in its own class RedisConnection. The RedisConnection uses a Workqueue with commands to fire against the Redis server. When a response is required a callback must be supplied, refer to RedisWriter::RedisGet(). Known Issues: - Authentication has no error handling and can break the connection - Error handling in general is iffy due to the nature of the async redis connection - Getting a reply out of RedisConnection is not trivial - HandleRW... sunt dracones
86 lines
2.9 KiB
C++
86 lines
2.9 KiB
C++
/******************************************************************************
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* Icinga 2 *
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* Copyright (C) 2012-2018 Icinga Development Team (https://www.icinga.com/) *
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* *
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* This program is free software; you can redistribute it and/or *
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* modify it under the terms of the GNU General Public License *
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* as published by the Free Software Foundation; either version 2 *
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* of the License, or (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, write to the Free Software Foundation *
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
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******************************************************************************/
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#ifndef REDISCONNECTION_H
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#define REDISCONNECTION_H
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#include <third-party/hiredis/async.h>
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#include "base/object.hpp"
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#include "base/workqueue.hpp"
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namespace icinga
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{
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/**
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* An Async Redis connection.
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*
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* @ingroup redis
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*/
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class RedisConnection final : public Object
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{
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public:
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DECLARE_PTR_TYPEDEFS(RedisConnection);
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RedisConnection(const String host, const int port, const String path, const String password = "", const int db = 0);
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void Start();
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void Connect();
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void Disconnect();
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bool IsConnected();
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void ExecuteQuery(const std::vector<String>& query, redisCallbackFn *fn = NULL, void *privdata = NULL);
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void ExecuteQueries(const std::vector<std::vector<String> >& queries, redisCallbackFn *fn = NULL,
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void *privdata = NULL);
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private:
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static void StaticInitialize();
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void SendMessageInternal(const std::vector<String>& query, redisCallbackFn *fn, void *privdata);
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void AssertOnWorkQueue();
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void HandleRW();
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static void DisconnectCallback(const redisAsyncContext *c, int status);
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WorkQueue m_RedisConnectionWorkQueue{100000};
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Timer::Ptr m_EventLoop;
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redisAsyncContext *m_Context;
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String m_Path;
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String m_Host;
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int m_Port;
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String m_Password;
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int m_DbIndex;
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boost::mutex m_CMutex;
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};
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struct redis_error : virtual std::exception, virtual boost::exception { };
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struct errinfo_redis_query_;
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typedef boost::error_info<struct errinfo_redis_query_, std::string> errinfo_redis_query;
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}
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#endif //REDISCONNECTION_H
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