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757</head>
758<body for="export-In" id="body">
759<div class="mume markdown-preview-out  ">
760    <h1 class="mume-header fontColor">trace_streamer工具说明</h1>
761    <p class="fontColor">trace_streamer是一个trace数据流转化器，可以将一个trace文本文件或者基于proto序列化的二进制文件转换成为sqlite数据库的形式。 trace_streamer使用C++实现，支持在ohos, linux, mac等系统上使用，具有良好的跨平台特性。</p>
762    <img src=".././figures/traceStreamer/trace_streamer_stream.png" alt="GitHub Logo"></p>
763    <h2 class="mume-header fontColor">
764        关于trace解析工具的使用说明：</h2>
765    <p class="fontColor">trace_streamer工具可以2种方式使用</p>
766    <ol class="fontColor">
767        <li>可以将系统离线trace文件解析并转为db，此工具支持基于文本的trace和基于proto的trace。</li>
768        <li>trace_streamer工具还可以WebAssembly的方式在浏览器中运行，需暴露相关接口给js文件。</li>
769    </ol>
770
771    <h3 class="mume-header fontColor">
772        导出db模式</h3>
773
774    <p class="fontColor">在导出db模式下，trace_streamer.exe trace文件路径名 -e 导出db路径名.db<br>
775        此命令可以将trace文件转为db<br>
776        本应用支持在ohos, linux, windows, mac使用。<br>
777        关于db文件的说明：<br>
778        使用db查看工具查看stat表，可以浏览当前数据一共有多少类数据，各类数据都收到多少条，数据是否正常等情况。在meta表会记录数据库导出时的一些系统信息，比如导入和导出的文件全路径，解析时间等信息。<br>
779        meta表可以选择不导出（有些情况下会暴露系统敏感信息），在导出时添加 -nm选项即可。<br>
780        在数据导出之后，会在本地目录下生成一个trace_streamer.log文件，在导出db的目录下生成一个数据库文件同名，.db.ohos.ts后缀的文件<br>
781        文件内容如下：<br>
782        时间戳:执行结果（数字）<br>
783        应用运行时间</p>
784    <p class="fontColor">执行结果解释如下：0 代表执行成功 1 表示输入文件不匹配， 2 表示解析错误， 3其他错误</p>
785    <h3 class="mume-header fontColor">内置浏览器方式</h3>
786
787    <p class="fontColor">trace_streamer可以WebAssembly方式在浏览器中运行，暴露如下接口给js</p>
788    <pre class="font_languageIn- light" data-info data-role="codeBlock"><code class="fontColor">extern &quot;C&quot; {
789/* 上传trace数据
790 *
791 * @data: 数据的缓冲区
792 * @dataLen: 数据长度
793 *
794 * return: 0：成功； -1：失败
795*/
796EMSCRIPTEN_KEEPALIVE int TraceStreamerParseData(const uint8_t* data, int dataLen);
797
798/* 通知TS上传trace数据结束
799 *
800 * return: 0：成功； -1：失败
801*/
802EMSCRIPTEN_KEEPALIVE int TraceStreamerParseDataOver();
803
804/* 通过sql语句操作数据库
805 *
806 * @sql: sql语句
807 * @sqlLen: sql语句长度
808 *
809 * return: 0：成功； -1：失败
810*/
811EMSCRIPTEN_KEEPALIVE int TraceStreamerSqlOperate(const uint8_t* sql, int sqlLen);
812
813/* 通过sql语句查询数据库
814 *
815 * @sql: sql语句
816 * @sqlLen: sql语句长度
817 * @out: 查询结果的缓冲区，查询结果为json
818 * @outLen: 缓冲区长度
819 *
820 * return: >0：查询成功，返回查询结果数据长度； -1：失败
821*/
822EMSCRIPTEN_KEEPALIVE int TraceStreamerSqlQuery(const uint8_t* sql, int sqlLen, uint8_t* out, int outLen);
823
824} // extern &quot;C&quot;
825</code></pre>
826    <h3 class="mume-header fontColor">
827        你也可以执行如下命令查看应用帮助</h3>
828
829    <p class="fontColor">./trace_streamer --help<br>
830        -i 选项可查看应用支持的事件源和具体的事件名列表
831    </p>
832    <h4 class="mume-header fontColor">trace_streamer支持解析的事件列表</h4>
833    <p class="fontColor">支持的事件列表参见&lt;&lt;<a href="./SupportEventList.html">SupportEventList.md</a>&gt;&gt;</p>
834    <h2 class="mume-header fontColor">TraceStreamer重要概念介绍</h2>
835
836    <h3 class="mume-header fontColor">1. 进程和线程标识符</h3>
837
838    <pre class="font-text light fontColor"><code class="fontColor"> 在通用操作系统中，进程号（pid/tgid）和线程号（tid）可能会被重复用于标识不同的进程或者线程。所以在trace数据源中，进程号（pid）和线程号（tid）也可能被重用。
839TraceStreamer在解析数据过程中，使用ipid(internal pid)唯一标识进程， itid(internal tid)唯一标识线程。
840</code></pre><h3 class="mume-header fontColor">2. 计量器</h3>
841
842    <p class="fontColor">用来记录系统中各种随时间连续变化的数值。例如： CPU的频率， 内存的使用量， 界面刷新频率。</p>
843    <h4 class="mume-header fontColor">举例</h4>
844
845    <p class="fontColor">CPU频率： <br>
846        <img src=".././figures/traceStreamer/cpu_frequency.png" alt="GitHub Logo"><br>
847        内存占用：  <br>
848        <img src=".././figures/traceStreamer/mem_usage.png" alt="GitHub Logo"></p>
849    <h3 class="mume-header fontColor">3. 过滤器</h3>
850
851    <p class="fontColor">TraceStreamer设计过程中使用了流式处理的思想，数据从入口进入以后，就像进入一条河流，从上游流向下游，在河道中央有很多过滤器，每种过滤器会将流过的数据中自己关注的内容吸附捕捉到。最终，每个过滤器都拥有了大量同类型的数据，而且这些数据都是按时间序列排列的。TraceStreamer使用filterid来标识同一种用途的数据，可以方便在UI中绘制。  <br>
852        ![image][filterimageid]</p>
853    <h2 class="mume-header fontColor">Stat表设计</h2>
854
855    <p class="fontColor">具体内容参见 <a href="./des_stat.html">des_stat</a></p>
856    <h2 class="mume-header fontColor">trace_streamer开发环境搭建和编译运行指引</h2>
857
858    <p class="fontColor">本应用使用gn作为构建工具。</p>
859    <h3 class="mume-header fontColor">1、开发环境</h3>
860
861    <p class="fontColor">ubuntu和mac使用vscode</p>
862    <h1 class="mume-header fontColor">对外部的依赖</h1>
863
864    <p class="fontColor">本应用依赖与sqlite，protobuf(htrace解析部分依赖) </p>
865    <p class="fontColor">本应用同时依赖于src/protos目录下文件来生成相关pb.h，pb.cc文件 </p>
866    <h3 class="mume-header fontColor">2.1、 编译linux和Mac版应用</h3>
867
868    <p class="fontColor">在根目录下执行相关命令进行编译</p>
869    <h3 class="mume-header fontColor">2.2、 编译wasm</h3>
870
871    <p class="fontColor">在根目录下执行相关命令进行编译</p>
872    <h3 class="mume-header fontColor">2.3、开始编译</h3>
873
874    <p class="fontColor">具体方法可参考<a href="./compile_trace_streamer.html">compile_trace_streamer</a></p>
875
876
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