hotfix

hotfix is a golang function hot-fix solution

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警告: 目前尚未经过严格测试，请勿用于生产环境
Warning: This has not been rigorously tested, do not use in production environment

注意: 不支持Windows
Note: Windows is not supported

注意: 为了确保函数都能被修补，需要关闭函数内联，会因此损失一些性能
Note: To ensure that all functions can be patched, function inlining needs to be disabled, which will result in a loss of some performance

Features

• 支持指定包级别/类级别/函数级别热补丁支持
• Supported for hot patching at package/class/function
• 支持导出函数/私有函数/成员方法修补
• Support for exporting functions/private functions/member methods patching
• 基于monkey-patch + plugin机制实现
• Implemented based on monkey-patch + plugin
• 线程安全, 使用 stw 确保所有协程都进入安全点从而实现线程安全的补丁
• Thread safety, use stw to ensure that all coroutines enter safe points to hot patching

Limits

• 受限于go plugin仅支持Linux, FreeBSD, macOS，其他平台目前不支持
• The go plugin is currently only supported on Linux, FreeBSD, and macOS platforms; other platforms are not supported
• 加载的补丁包无法卸载，如果热修复次数过多可能导致较大的内存占用
• The loaded patch package cannot be uninstalled. Too many hot fixes may result in large memory usage
• 不支持对闭包进行修复，需要热修复的逻辑不要放在闭包中
• Closures are not supported, and logic that requires hotfixes should not be placed in closures
• 不能修改已有数据结构和函数签名，否则可能将导致程序崩溃，应该仅用于bug修复
• Cannot modify existing data structures and function signatures, as this may lead to program crashes. It should only be used for bug fixes
• 编译时请保留调试符号，并且禁用函数内联-gcflags=all=-l
• Please keep the debugging symbols when compiling, and disable function inline -gcflags=all=-l
• 编译错误invalid reference to xxxx 是因为 go1.23开始限制了go:linkname功能，必须添加编译参数关闭限制-ldflags=-checklinkname=0
• The compilation error invalid reference to xxxx is because go1.23 began to limit the go:linkname function, and the compilation parameter must be added to turn off the restriction -ldflags=-checklinkname=0
• 补丁包的的编译环境必须和主程序一致，包括go编译器版本，编译参数，依赖等，否则加载补丁包将会失败
• The patch package's build environment must match that of the main program, including the Go compiler version, compilation parameters, dependencies, etc., otherwise loading the patch package will fail
• 补丁包的main包下面的init会首先调用一次，请注意不要重复初始化
• The 'init' under the 'main' package of the patch package will be called once first, be careful not to initialize it repeatedly
• 打补丁包时main包必须产生变化，否则可能出现 plugin already loaded错误，推荐使用 -ldflags="-X main.HotfixVersion=v1.0.1"指定版本号， 确保每次编译补丁包都会有变化
• The main package must be changed when applying the patch package, otherwise the plugin already loaded error may occur. It is recommended to use -ldflags="-X main.HotfixVersion=v1.0.1" to specify the version number to ensure that the patch package is compiled every time There will be changes
• 该方案处于实验性质，尚未经过严格验证
• The solution is experimental in nature and has not yet been rigorously validated

Example

参考这个例子项目
Refer to this example project

Acknowledgments

This project inspired by lsg2020/go-hotfix

License

The repository released under version 2.0 of the Apache License.