本篇文章为你整理了基于arthas热更新class脚本(arthas classloader)的详细内容,包含有arthas热部署 arthas classloader arthas热替换 基于arthas热更新class脚本,希望能帮助你了解 基于arthas热更新class脚本。
1. 概述
基于arthas工具的retransform命令热替换class,此方法用于在不重启项目的前提下,替换更新的class,如关键类添加打印日志,排查线上问题
但arthas工具的命令稍显复杂,有那个时间还不如重新部署,因此需要一个可以快速替换的工具来进行替换
2. 方法一:ArthasHotSwap插件
使用idea插件 ArthasHotSwap插件,安装后,选中类名数据右键点击“swap this class”,会复制一个脚本,然后粘贴到项目启动的服务器上,可完成替换,具体网上均有教程,此处不多赘述。
3. 方法二:自定义shell脚本
我本人也使用过这个插件,但是试过几次均没有成功因此模仿ArthasHotSwap插件的流程,写了一个自定义脚本。
3.1. ArthasHotSwap 插件流程
大致流程如下:
1.将本地需替换的class文件,编码成base64文本文件,并上传至文件服务器(可能是OSS)
2.提供一个默认执行脚本,给用户复制
3.用户拿到复制脚本后,在服务器上执行
4.脚本下载base64文本文件,并解析成class文件
5.启动arthas命令,如果用户没有安装,脚本会自动安装,默认路径 /home/用户名xxx/.arthas/
6.执行arthas中的retransform 命令,将解析出来的class文件替换至运行的jvm中
插件脚本源码:
点击查看代码
#Copyright (c) 2020, 2021, xxxtai. All rights reserved.
#!/usr/bin/env bash
echo "
/\$\$\$\$\$\$ /\$\$ /\$\$
/\$\$__ \$\$ \$\$ \$\$
\$\$ \ \$\$ /\$\$\$\$\$\$ /\$\$\$\$\$\$ \$\$\$\$\$\$\$ /\$\$\$\$\$\$ /\$\$\$\$\$\$\$
\$\$\$\$\$\$\$\$ /\$\$__ \$\$_ \$\$_/ \$\$__ \$\$ ____ \$\$ /\$\$_____/
\$\$__ \$\$ \$\$ \__/ \$\$ \$\$ \ \$\$ /\$\$\$\$\$\$\$ \$\$\$\$\$\$
\$\$ \$\$ \$\$ \$\$ /\$\$ \$\$ \$\$ /\$\$__ \$\$ \____ \$\$
\$\$ \$\$ \$\$ \$\$\$\$/ \$\$ \$\$ \$\$\$\$\$\$\$ /\$\$\$\$\$\$\$/
__/ __/__/ \___/ __/ __/ \_______/_______/
/\$\$ /\$\$ /\$\$ /\$\$\$\$\$\$
\$\$ \$\$ \$\$ /\$\$__ \$\$
\$\$ \$\$ /\$\$\$\$\$\$ /\$\$\$\$\$\$ \$\$ \__/ /\$\$ /\$\$ /\$\$ /\$\$\$\$\$\$ /\$\$\$\$\$\$
\$\$\$\$\$\$\$\$ /\$\$__ \$\$_ \$\$_/ \$\$\$\$\$\$ \$\$ \$\$ \$\$ ____ \$\$ /\$\$__ \$\$
\$\$__ \$\$ \$\$ \ \$\$ \$\$ \____ \$\$ \$\$ \$\$ \$\$ /\$\$\$\$\$\$\$ \$\$ \ \$\$
\$\$ \$\$ \$\$ \$\$ \$\$ /\$\$ /\$\$ \ \$\$ \$\$ \$\$ \$\$ /\$\$__ \$\$ \$\$ \$\$
\$\$ \$\$ \$\$\$\$\$\$/ \$\$\$\$/ \$\$\$\$\$\$/ \$\$\$\$\$/\$\$\$\$/ \$\$\$\$\$\$\$ \$\$\$\$\$\$\$/
__/ __/ \______/ \___/ \______/ \_____/\___/ \_______/ \$\$____/
\$\$
\$\$
__/
echo "************************************************** 1. Prepare the workspace **********************************************************"
if [ ! -d "./arthas-hot-swap" ]
mkdir ./arthas-hot-swap
echo "******* mkdir ./arthas-hot-swap success"
rm -rf ./arthas-hot-swap
mkdir ./arthas-hot-swap
echo "******* ./arthas-hot-swap exists, delete the directory first, and then create a new one"
cd ./arthas-hot-swap
rm -f $(pwd)/arthas-hot-swap-result
echo "**************************************************** 2. install openssl **************************************************************"
openssl version
if [[ $? -eq 0 ]]; then
echo "******* openssl has been installed successfully "
echo "******* openssl is not installed, and installation were start next "
sudo yum install openssl openssl-devel
echo "********************************************* 3. Download the encrypted file *********************************************************"
curl http://xxxtai-arthas-hot-swap.oss-cn-beijing.aliyuncs.com/public/WHObQxW0HIDDniGwtf0QetenxurLDcwehvqFZPmVx6I=x encrypt-FrameController.txt
echo "************************************************* 4. Encrypt the file ****************************************************************"
openssl enc -aes-128-cbc -a -d -in encrypt-FrameController.txt -out FrameController.class -K $1 -iv $2
echo "************************************************* 5. Install arthas ******************************************************************"
specifyJavaHome=
arthas_start_cmd=
if [[ ${specifyJavaHome} == ]]
curl -L https://arthas.aliyun.com/install.sh sh
arthas_start_cmd=./as.sh
curl -O https://arthas.aliyun.com/arthas-boot.jar
arthas_start_cmd=${specifyJavaHome}" -jar arthas-boot.jar"
selectJavaProcessName=%[selectJavaProcessName]
if [[ ${selectJavaProcessName} != ]]
arthas_start_cmd=${arthas_start_cmd}" --select "${selectJavaProcessName}
echo "************************************************* 6. Create a pipeline ***************************************************************"
rm -f tmp_in
mknod tmp_in p
exec 8 tmp_in
${arthas_start_cmd} 8
echo "********************************************* 7. Choose the java process *************************************************************"
sleep 1s
echo "
" tmp_in
echo "*********************************************** 8. Redefine the class ****************************************************************"
sleep 3s
echo "retransform $(pwd)/FrameController.class $(pwd)/arthas-hot-swap-result" tmp_in
sleep 4s
echo "quit" tmp_in
sleep 2s
swapResult=$(cat $(pwd)/arthas-hot-swap-result grep "success")
echo $swapResult
if [[ $swapResult != "" ]]
echo
****************************************** 9. The following files were successfully hot deployed *************************** ****************
*****
***** FrameController.class
*****
********************************************************************************************************************************************
echo
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 9. Failed to hot deployed the following files %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%
%%%%% FrameController.class
%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
cat $(pwd)/arthas-hot-swap-result
3.2. 自定义脚本
按照这个流程,自定义写了一个脚本,去掉了上传文件服务器步骤,只需要把许替换的文件上传至服务器指定目录,启动脚本时指定项目包名称,即可完成指定项目多个class文件热替换
#热刷新class指定路径配置
updateClassPath="/tmp/replace"
#服务器上arthas路径
arthasPath="/home/cmp/.arthas/lib/3.6.7/arthas"
#入参 项目包名称,支持模糊匹配
projectName=$1
rm -f tmp_in
mknod tmp_in p
exec 8 tmp_in
sh ${arthasPath}/as.sh --select $projectName 8
echo "********************************************* Arthas HotSwap The Java Class *************************************************************"
sleep 1s
echo "
" tmp_in
sleep 3s
echo "开热加载......"
#遍历目录中的所有class文件
for file in ${updateClassPath}/*
echo ${file}
#如果file后缀是class 执行替换
if [ "${file##*.}" = "class" ]; then
#开始启动arthas项目
echo "热加载${file}"
echo "retransform ${file}" tmp_in
echo "quit" tmp_in
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