前情提要
目前項目使用的agent 是在skywalking 上進行改造擴展的,但由於skywalking 的版本也是需要週期性更新的,這樣會導致在合併的時候非常噁心人,所以準備從skywalking agent 中將改造的插件功能剝離出來。
先說下獨立功能有幾個組件,
大概訪問流程是這樣的 ui --> proxy --> agent
-
ui 負責命令交互,數據展示等
-
proxy 負責通道維護,數據分揀
-
agent 負責應用數據監控抓取
所以在我們剝離出來後也會有三個項目 ui、proxy、agent,由此大家可以看出了,基本上大部分apm 大概都是這樣的流程。
此次說明的重點不是三個項目的實現,而是通過maven 進行工程的初始化構造。平時我們開發的項目無非是打出一個jar 或者war來進行項目部署。
但因爲我們這一套apm 是一個整體,爲了方便維護迭代,我們將其進行整合打包,先看下完成後整體的結構
先大概說明下目錄的用途
-
agent-dist 打包後存放agent 的目錄
-
agent-proxy-dist 打包後存放proxy的目錄
-
arthas-dis 因爲我們agent 支持arthas 的所有命令集,所有需要arthas的依賴
-
config agent的配置文件
-
cubic-agent agent 源碼
-
cubic-core agent core 源碼
-
cubic-proxy 代理源碼
-
cubic-ui ui 源碼
-
scripts 打包腳本
其實整個項目沒有多麼負責,整個核心的點只有幾個:
- 構建一個基礎agent 項目
- 通過maven 插件maven-shade-plugin 進行打包 和 package名稱的修改 ,用來防止和應用jar 衝突
- 通過 maven maven-antrun-plugin 進行部署包的整理
下面我們就來講解下整個流程
構建
1、父項目
首先需要一個父項目來包含管理整個項目組,如果你使用IDEA 右鍵可以很簡單的構建一個maven 項目,刪除掉其src 目錄後我們來看下pom 的依賴,很簡單不多說了
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>matrix.cubic</groupId>
<artifactId>cubic</artifactId>
<packaging>pom</packaging>
<version>1.0-SNAPSHOT</version>
<modules>
<module>cubic-agent</module>
<module>cubic-core</module>
<module>cubic-proxy</module>
</modules>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>2.2.5.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<dependency>
<groupId>matrix.cubic</groupId>
<artifactId>cubic-core</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>20.0</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.9</version>
</dependency>
<dependency>
<groupId>io.netty</groupId>
<artifactId>netty-all</artifactId>
<version>4.1.45.Final</version>
</dependency>
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.8.6</version>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.6.1</version>
<configuration>
<source>${java.version}</source>
<target>${java.version}</target>
</configuration>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>
2、構建基礎agent
當前agent 我分爲了兩個簡單的包,cubic-core 包含了所有的核心代碼,cubic-agent 只是包含了一個啓動類,你可以根據自己需求創建。
其實打包的核心都在pom ,代碼編寫反而不是重點了。
來看下cubic-core的 pom
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>cubic</artifactId>
<groupId>matrix.cubic</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>cubic-core</artifactId>
<properties>
<shade.package>com.matrix.cubic.agent.core.dependencies</shade.package>
<shade.com.google.source>com.google</shade.com.google.source>
<shade.com.google.target>${shade.package}.${shade.com.google.source}</shade.com.google.target>
<shade.io.grpc.source>io.grpc</shade.io.grpc.source>
<shade.io.grpc.target>${shade.package}.${shade.io.grpc.source}</shade.io.grpc.target>
<shade.io.netty.source>io.netty</shade.io.netty.source>
<shade.io.netty.target>${shade.package}.${shade.io.netty.source}</shade.io.netty.target>
<shade.org.apache.commons.source>org.apache.commons</shade.org.apache.commons.source>
<shade.org.apache.commons.target>${shade.package}.${shade.org.apache.commons.source}</shade.org.apache.commons.target>
</properties>
<dependencies>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.30</version>
</dependency>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
</dependency>
<dependency>
<groupId>commons-net</groupId>
<artifactId>commons-net</artifactId>
<version>3.6</version>
</dependency>
<dependency>
<groupId>com.sun</groupId>
<artifactId>linux-tools</artifactId>
<version>1.8</version>
</dependency>
<dependency>
<groupId>io.netty</groupId>
<artifactId>netty-all</artifactId>
</dependency>
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<artifactId>maven-shade-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<artifactSet>
<excludes>
<exclude>net.bytebuddy:byte-buddy:jar:</exclude>
<exclude>com.google.errorprone:error_prone_annotations:jar:</exclude>
<exclude>com.google.code.findbugs:jsr305:jar:</exclude>
<exclude>com.google.android:annotations:jar:</exclude>
<exclude>com.google.api.grpc:proto-google-common-protos:jar:</exclude>
<exclude>org.checkerframework:checker-compat-qual:jar:</exclude>
<exclude>org.codehaus.mojo:animal-sniffer-annotations:jar:</exclude>
</excludes>
</artifactSet>
<relocations>
<relocation>
<pattern>${shade.com.google.source}</pattern>
<shadedPattern>${shade.com.google.target}</shadedPattern>
</relocation>
<relocation>
<pattern>${shade.io.grpc.source}</pattern>
<shadedPattern>${shade.io.grpc.target}</shadedPattern>
</relocation>
<relocation>
<pattern>${shade.io.netty.source}</pattern>
<shadedPattern>${shade.io.netty.target}</shadedPattern>
</relocation>
<relocation>
<pattern>${shade.org.apache.commons.source}</pattern>
<shadedPattern>${shade.org.apache.commons.target}</shadedPattern>
</relocation>
</relocations>
<filters>
<filter>
<artifact>com.google.protobuf:protobuf-java</artifact>
<excludes>
<exclude>google/protobuf/*.proto</exclude>
<exclude>google/protobuf/compiler/*.proto</exclude>
</excludes>
</filter>
</filters>
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer" />
</transformers>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
總覽全部,核心點還是maven 這幾個插件,下面結合實際簡單介紹下
maven-shade-plugin
這個插件就一個功能,就是幫你創建一個jar包,插件核心點有兩個
-
選擇內容
-
類重定位
這裏的打包其實是把我們的依賴都打進去了,來看個jar 解壓後的截圖,比如我們依賴了slf4j,如圖:
選擇內容
簡單來說就是我們希望哪些依賴打入jar ,哪些依賴排除。
- 標籤 -》 進行配置,支持兩種操作include和exclude
- 配置格式:groupId:artifactId[[:type]:classifier],至少包含groupid和artifactid,type和類名可選
- 支持’*’ 和 ‘?’執行通配符匹配
舉例:
<plugin>
<artifactId>maven-shade-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<artifactSet>
<excludes>
<exclude>net.bytebuddy:byte-buddy:jar:</exclude>
<exclude>com.google.errorprone:error_prone_annotations:jar:</exclude>
<exclude>com.google.code.findbugs:jsr305:jar:</exclude>
<exclude>com.google.android:annotations:jar:</exclude>
<exclude>com.google.api.grpc:proto-google-common-protos:jar:</exclude>
<exclude>org.checkerframework:checker-compat-qual:jar:</exclude>
<exclude>org.codehaus.mojo:animal-sniffer-annotations:jar:</exclude>
</excludes>
</artifactSet>
</configuration>
</execution>
</executions>
</plugin>
類的重定位
因爲寫agent 和組件不像寫代碼,agent會給很多應用使用,每個應用的情況都是不相同的,比如你引入的fastjson和對方的版本不一直導致的使用衝突,這種問題其實還是很噁心人的,也噁心了開發組。
所爲爲了避免這種情況,我們就可以使用此插件給我們依賴的開源包變一個package路徑,這樣就不再會有衝突了(因爲classloader 加載一個類是通過package +class name確定唯一的)
上例子:
通過例子我們可以看出,將com.google 的package 改成了com.matrix.cubic.agent.core.dependencies.com.google,有興趣的可以自己看下編譯後的class
<plugin>
<artifactId>maven-shade-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<relocations>
<relocation>
<pattern>com.google</pattern>
<shadedPattern>com.matrix.cubic.agent.core.dependencies.com.google</shadedPattern>
</relocation>
</relocations>
</configuration>
</execution>
</executions>
</plugin>
打包cubic-agent
通過上面的一通操作,agent-core的核心代碼已經打包完畢了,前面提過在cubic-agent 裏面其實是依賴了cubic-core,並且只包含了一個啓動類,真要變成一個可加載的agent 還需要在cubic-agent裏面進行處理下。
核心啓動類:
public static void premain(String agentArgs, Instrumentation instrumentation) {
System.out.println("add agent");
CubicConfInitalizer.initConfig();
// instrumentation.addTransformer(new DefineTransformer(), true);
AgentNettyClient client = new AgentNettyClient();
client.start();
Runtime.getRuntime()
.addShutdownHook(new Thread(client::destroyAndSync, "cubic agent shutdown thread"));
}
cubic-agent pom
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>cubic</artifactId>
<groupId>matrix.cubic</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>cubic-agent</artifactId>
<dependencies>
<dependency>
<groupId>matrix.cubic</groupId>
<artifactId>cubic-core</artifactId>
</dependency>
</dependencies>
<properties>
<premain.class>com.matrix.agent.MatrixAgent</premain.class>
<can.redefine.classes>true</can.redefine.classes>
<can.retransform.classes>true</can.retransform.classes>
</properties>
<build>
<finalName>cubic-agent</finalName>
<plugins>
<plugin>
<artifactId>maven-shade-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<shadedArtifactAttached>false</shadedArtifactAttached>
<createDependencyReducedPom>true</createDependencyReducedPom>
<createSourcesJar>true</createSourcesJar>
<shadeSourcesContent>true</shadeSourcesContent>
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<manifestEntries>
<Premain-Class>${premain.class}</Premain-Class>
<Can-Redefine-Classes>${can.redefine.classes}</Can-Redefine-Classes>
<Can-Retransform-Classes>${can.retransform.classes}</Can-Retransform-Classes>
</manifestEntries>
</transformer>
</transformers>
<artifactSet>
<excludes>
<exclude>*:gson</exclude>
<exclude>io.grpc:*</exclude>
<exclude>io.netty:*</exclude>
<exclude>com.google.*:*</exclude>
<exclude>com.google.guava:guava</exclude>
</excludes>
</artifactSet>
<filters>
<filter>
<artifact>net.bytebuddy:byte-buddy</artifact>
<excludes>
<exclude>META-INF/versions/9/module-info.class</exclude>
</excludes>
</filter>
</filters>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
</plugin>
<plugin>
<artifactId>maven-antrun-plugin</artifactId>
<executions>
<execution>
<id>clean</id>
<phase>clean</phase>
<goals>
<goal>run</goal>
</goals>
<configuration>
<tasks>
<echo>${project.basedir}</echo>
<delete dir="${project.basedir}/../agent-dist" />
</tasks>
</configuration>
</execution>
<execution>
<id>package</id>
<phase>package</phase>
<goals>
<goal>run</goal>
</goals>
<configuration>
<tasks>
<mkdir dir="${project.basedir}/../agent-dist" />
<copy file="${project.build.directory}/cubic-agent.jar" tofile="${project.basedir}/../agent-dist/cubic-agent.jar" overwrite="true" />
<mkdir dir="${project.basedir}/../agent-dist/config" />
<mkdir dir="${project.basedir}/../agent-dist/logs" />
<copydir src="${project.basedir}/../config" dest="${project.basedir}/../agent-dist/config" forceoverwrite="true" />
<copydir src="${project.basedir}/../arthas-dist" dest="${project.basedir}/../agent-dist/arthas" forceoverwrite="true" />
</tasks>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
通過pom可以發現重點是 maven-shade-plugin 和maven-antrun-plugin 兩個插件
maven-shade-plugin 這裏用於打造一個可執行的jar ,其實就是將一些基礎信息寫入到jar包的MANIFEST.MF 中,
核心點如下
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<manifestEntries>
<Premain-Class>${premain.class}</Premain-Class>
<Can-Redefine-Classes>${can.redefine.classes}</Can-Redefine-Classes>
<Can-Retransform-Classes>${can.retransform.classes}</Can-Retransform-Classes>
</manifestEntries>
</transformer>
</transformers>
maven-antrun-plugin 用來做一些搬運的工作,截取一部分核心內容
-
整體的過程就是:
-
創建一個agent-dist 文件夾
-
將我們cubic-agent 項目打包後的jar 拷貝到agent-dist下
-
創建agent-dist/config 文件夾
-
創建agent-dist/logs 文件夾
-
將agent config 拷貝到agent-dist/config 下
-
拷貝arthas-dist 目錄到agent-dist/arthas下
<configuration> <tasks> <mkdir dir="${project.basedir}/../agent-dist" /> <copy file="${project.build.directory}/cubic-agent.jar" tofile="${project.basedir}/../agent-dist/cubic-agent.jar" overwrite="true" /> <mkdir dir="${project.basedir}/../agent-dist/config" /> <mkdir dir="${project.basedir}/../agent-dist/logs" /> <copydir src="${project.basedir}/../config" dest="${project.basedir}/../agent-dist/config" forceoverwrite="true" /> <copydir src="${project.basedir}/../arthas-dist" dest="${project.basedir}/../agent-dist/arthas" forceoverwrite="true" /> </tasks> </configuration
至此爲止我們的agent 就打包完畢並且放到我們定義的地方了,後面proxy 是一個標準的spring boot 項目,使用的也是
maven-antrun-plugin進行的整合。
3、編寫打包腳本
最後就是簡單的寫下build.sh 打包腳本就可以執行了,有興趣的同學也可以搞下mvnw
#!/bin/bash
cd "${0%/*}"
cd ..
mvn -v
if [ $? -ne 0 ]; then
echo "command mvn not found, Install the maven before executing the script!"
exit 0;
fi
#打包agent
echo "================ starting to build cubic agent ================"
mvn clean package -Dmaven.test.skip -Denforcer.skip=true
echo "================ building cubic agent finished ================"
總結:
-
至此我們就創建了一個方便維護的agent 項目模板,剩下的就是開心的寫代碼了。
-
其中的關鍵點就是兩個插件maven-shade-plugin 和 maven-antrun-plugin,有興趣可以通讀下文檔,很強大的
-
其中agent 的寫法到不是重點了,有興趣的話再寫一個,推薦看下skywalking agent 擴展性真不錯
-
放下此文代碼庫 https://gitee.com/sanjiankethree/cubic.git