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README
MulanPSL-2.0

Distributed Configuration Center

分布式配置中心,基于DCF实现的一个状态机,用于实现集群中配置信息管理; openGauss CM依赖DCC组件对配置数据分布式存取,实现集群配置管理高可用能力;

一、工程说明

1、编程语言:C
2、编译工程:cmake或make,建议使用cmake
3、目录说明:
  • DCC:主目录,CMakeLists.txt为主工程入口;
  • src: 源代码目录,按子目录划分模块解耦;
  • test:测试工程
  • build:工程构建脚本

二、编译指导

1、概述

编译DCC需要依赖CBB、DCF和binarylibs三个组件。

  • CBB:DCC依赖的公共函数代码。可以从开源社区获取。
  • DCF:DCC依赖的分布式一致性框架能力。可以从开源社区获取。
  • binarylibs:依赖的第三方开源软件,你可以直接编译openGauss-third_party代码获取,也可以从开源社区下载已经编译好的并上传的一个副本。
2、操作系统和软件依赖要求

支持以下操作系统:

  • CentOS 7.6(x86)
  • openEuler-20.03-LTS 适配其他系统,可参照openGauss数据库编译指导 当前DCC依赖第三方软件有securec、zlib、lz4、zstd、openssl、cjson; 编译DCC依赖的第三方软件要求与编译opengauss对依赖的第三方软件要求一致。
3、下载DCC及依赖组件

可以从开源社区下载DCC、CBB、DCF和openGauss-third_party。 可以通过以下网站获取编译好的binarylibs。 https://opengauss.obs.cn-south-1.myhuaweicloud.com/2.0.0/openGauss-third_party_binarylibs.tar.gz

4、编译第三方软件

在编译DCC之前,需要先编译DCC依赖的开源及第三方软件。这些开源及第三方软件存储在openGauss-third_party代码仓库中,通常只需要构建一次。如果开源软件有更新,需要重新构建软件。 用户也可以直接从binarylibs库中获取开源软件编译和构建的输出文件。

5、代码编译

使用DCC/build/linux/opengauss/build.sh编译代码, 参数说明请见以下表格。

选项 参数 说明
-3rd [binarylibs path] 指定binarylibs路径。该路径必须是绝对路径。
-m [version_mode] 编译目标版本,Debug或者Release。默认Release
-t [build_tool] 指定编译工具,cmake或者make。默认cmake。

现在只需使用如下命令即可编译:
[user@linux dcc]$ sh build.sh -3rd [binarylibs path] -m Release -t cmake
完成编译后,动态库生成在DCC/output/lib目录中

三、接口与使用示例

#####1. 接口说明

参见:DCC/src/interface/dcc_interface.h

#####2. DEMO示例

参见:DCC/test/test_main
demo示例主要演示了一个dcc集群场景,进行简单的键值操作步骤与流程;
示例中主要步骤说明:

  1. dcc参数设置与启动
    srv_set_param("NODE_ID", ... -- 设置当前dcc节点node_id
    srv_set_param("DATA_PATH", ... -- 设置dcc数据路径
    srv_set_param("ENDPOINT_LIST", ... -- 设置dcc集群配置信息
    srv_dcc_register_status_notify() -- 注册dcc角色变更通告回调函数
    srv_dcc_start() -- 启动dcc实例
  2. dcc创建会话并操作
    srv_dcc_alloc_handle(&handle); -- 创建一个dcc会话
    srv_dcc_put(handle, &key, &val, &option) -- 插入一个key/value键值对数据
  3. dcc结束会话与退出
    srv_dcc_free_handle(handle); -- 结束当前已创建的会话
    srv_dcc_stop(); -- 停止当前dcc实例
木兰宽松许可证, 第2版 木兰宽松许可证, 第2版 2020年1月 http://license.coscl.org.cn/MulanPSL2 您对“软件”的复制、使用、修改及分发受木兰宽松许可证,第2版(“本许可证”)的如下条款的约束: 0. 定义 “软件” 是指由“贡献”构成的许可在“本许可证”下的程序和相关文档的集合。 “贡献” 是指由任一“贡献者”许可在“本许可证”下的受版权法保护的作品。 “贡献者” 是指将受版权法保护的作品许可在“本许可证”下的自然人或“法人实体”。 “法人实体” 是指提交贡献的机构及其“关联实体”。 “关联实体” 是指,对“本许可证”下的行为方而言,控制、受控制或与其共同受控制的机构,此处的控制是指有受控方或共同受控方至少50%直接或间接的投票权、资金或其他有价证券。 1. 授予版权许可 每个“贡献者”根据“本许可证”授予您永久性的、全球性的、免费的、非独占的、不可撤销的版权许可,您可以复制、使用、修改、分发其“贡献”,不论修改与否。 2. 授予专利许可 每个“贡献者”根据“本许可证”授予您永久性的、全球性的、免费的、非独占的、不可撤销的(根据本条规定撤销除外)专利许可,供您制造、委托制造、使用、许诺销售、销售、进口其“贡献”或以其他方式转移其“贡献”。前述专利许可仅限于“贡献者”现在或将来拥有或控制的其“贡献”本身或其“贡献”与许可“贡献”时的“软件”结合而将必然会侵犯的专利权利要求,不包括对“贡献”的修改或包含“贡献”的其他结合。如果您或您的“关联实体”直接或间接地,就“软件”或其中的“贡献”对任何人发起专利侵权诉讼(包括反诉或交叉诉讼)或其他专利维权行动,指控其侵犯专利权,则“本许可证”授予您对“软件”的专利许可自您提起诉讼或发起维权行动之日终止。 3. 无商标许可 “本许可证”不提供对“贡献者”的商品名称、商标、服务标志或产品名称的商标许可,但您为满足第4条规定的声明义务而必须使用除外。 4. 分发限制 您可以在任何媒介中将“软件”以源程序形式或可执行形式重新分发,不论修改与否,但您必须向接收者提供“本许可证”的副本,并保留“软件”中的版权、商标、专利及免责声明。 5. 免责声明与责任限制 “软件”及其中的“贡献”在提供时不带任何明示或默示的担保。在任何情况下,“贡献者”或版权所有者不对任何人因使用“软件”或其中的“贡献”而引发的任何直接或间接损失承担责任,不论因何种原因导致或者基于何种法律理论,即使其曾被建议有此种损失的可能性。 6. 语言 “本许可证”以中英文双语表述,中英文版本具有同等法律效力。如果中英文版本存在任何冲突不一致,以中文版为准。 条款结束 如何将木兰宽松许可证,第2版,应用到您的软件 如果您希望将木兰宽松许可证,第2版,应用到您的新软件,为了方便接收者查阅,建议您完成如下三步: 1, 请您补充如下声明中的空白,包括软件名、软件的首次发表年份以及您作为版权人的名字; 2, 请您在软件包的一级目录下创建以“LICENSE”为名的文件,将整个许可证文本放入该文件中; 3, 请将如下声明文本放入每个源文件的头部注释中。 Copyright (c) [Year] [name of copyright holder] [Software Name] is licensed under Mulan PSL v2. You can use this software according to the terms and conditions of the Mulan PSL v2. You may obtain a copy of Mulan PSL v2 at: http://license.coscl.org.cn/MulanPSL2 THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE. See the Mulan PSL v2 for more details. Mulan Permissive Software License,Version 2 Mulan Permissive Software License,Version 2 (Mulan PSL v2) January 2020 http://license.coscl.org.cn/MulanPSL2 Your reproduction, use, modification and distribution of the Software shall be subject to Mulan PSL v2 (this License) with the following terms and conditions: 0. Definition Software means the program and related documents which are licensed under this License and comprise all Contribution(s). Contribution means the copyrightable work licensed by a particular Contributor under this License. Contributor means the Individual or Legal Entity who licenses its copyrightable work under this License. Legal Entity means the entity making a Contribution and all its Affiliates. Affiliates means entities that control, are controlled by, or are under common control with the acting entity under this License, ‘control’ means direct or indirect ownership of at least fifty percent (50%) of the voting power, capital or other securities of controlled or commonly controlled entity. 1. Grant of Copyright License Subject to the terms and conditions of this License, each Contributor hereby grants to you a perpetual, worldwide, royalty-free, non-exclusive, irrevocable copyright license to reproduce, use, modify, or distribute its Contribution, with modification or not. 2. Grant of Patent License Subject to the terms and conditions of this License, each Contributor hereby grants to you a perpetual, worldwide, royalty-free, non-exclusive, irrevocable (except for revocation under this Section) patent license to make, have made, use, offer for sale, sell, import or otherwise transfer its Contribution, where such patent license is only limited to the patent claims owned or controlled by such Contributor now or in future which will be necessarily infringed by its Contribution alone, or by combination of the Contribution with the Software to which the Contribution was contributed. The patent license shall not apply to any modification of the Contribution, and any other combination which includes the Contribution. If you or your Affiliates directly or indirectly institute patent litigation (including a cross claim or counterclaim in a litigation) or other patent enforcement activities against any individual or entity by alleging that the Software or any Contribution in it infringes patents, then any patent license granted to you under this License for the Software shall terminate as of the date such litigation or activity is filed or taken. 3. No Trademark License No trademark license is granted to use the trade names, trademarks, service marks, or product names of Contributor, except as required to fulfill notice requirements in section 4. 4. Distribution Restriction You may distribute the Software in any medium with or without modification, whether in source or executable forms, provided that you provide recipients with a copy of this License and retain copyright, patent, trademark and disclaimer statements in the Software. 5. Disclaimer of Warranty and Limitation of Liability THE SOFTWARE AND CONTRIBUTION IN IT ARE PROVIDED WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED. IN NO EVENT SHALL ANY CONTRIBUTOR OR COPYRIGHT HOLDER BE LIABLE TO YOU FOR ANY DAMAGES, INCLUDING, BUT NOT LIMITED TO ANY DIRECT, OR INDIRECT, SPECIAL OR CONSEQUENTIAL DAMAGES ARISING FROM YOUR USE OR INABILITY TO USE THE SOFTWARE OR THE CONTRIBUTION IN IT, NO MATTER HOW IT’S CAUSED OR BASED ON WHICH LEGAL THEORY, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. 6. Language THIS LICENSE IS WRITTEN IN BOTH CHINESE AND ENGLISH, AND THE CHINESE VERSION AND ENGLISH VERSION SHALL HAVE THE SAME LEGAL EFFECT. IN THE CASE OF DIVERGENCE BETWEEN THE CHINESE AND ENGLISH VERSIONS, THE CHINESE VERSION SHALL PREVAIL. END OF THE TERMS AND CONDITIONS How to Apply the Mulan Permissive Software License,Version 2 (Mulan PSL v2) to Your Software To apply the Mulan PSL v2 to your work, for easy identification by recipients, you are suggested to complete following three steps: Fill in the blanks in following statement, including insert your software name, the year of the first publication of your software, and your name identified as the copyright owner; Create a file named "LICENSE" which contains the whole context of this License in the first directory of your software package; Attach the statement to the appropriate annotated syntax at the beginning of each source file. Copyright (c) [Year] [name of copyright holder] [Software Name] is licensed under Mulan PSL v2. You can use this software according to the terms and conditions of the Mulan PSL v2. You may obtain a copy of Mulan PSL v2 at: http://license.coscl.org.cn/MulanPSL2 THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE. See the Mulan PSL v2 for more details.

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