Home > Article > Backend Development > How to generate go dynamic library or static library in Go
Preliminary knowledge
plugin mode
Plug-in running mode
go plugin package use
Related knowledge (recommended: go language tutorial)
go build You can specify the buildmode . Divided into multiple modes. The specific modes are as follows.
Mode | Description |
---|---|
Current go version | 1.10.3 |
archive | Compile into a binary file. Generally it is a static library file. xx.a |
c-archive | is compiled into a C archive file. C callable static library. xx.a. Note that to compile into such a file, you need to import C and the function to be called externally must be commented above the function using "//export function name". Otherwise the function will not be exported by default. |
c-shared | Compile into a C shared library. It is also necessary to import "C" and comment // export xxx |
default | above the function for direct compilation into an executable file with the main package. If there is no main package, compile it into an .a file |
exe | Compile it into a window executable program |
plugin | Compile the main package and dependent packages into go plugin. Non-main packages are ignored. [C-like shared library or static library. Plug-in development use】 |
Instance
结构: -softplugin //根目录 -soft //软件目录 -plugins //插件目录 -itf //接口目录
No custom data
// plugins/hello.go package main import "fmt" func Hello(){ fmt.Println("hello") } // go build -buildmode=plugin -o hello.so hello.go // soft/basetype.go package main import ( "os" "path" "plugin" "fmt" ) func main(){ //加载插件 pluginDir := "../plugins" //扫描文件夹下所有so文件 f, err := os.OpenFile(pluginDir, os.O_RDONLY, 0666) if err != nil { panic(err) } fi, err := f.Readdir(-1) if err != nil { panic(err) } plugins := make([]os.FileInfo, 0) for _, ff := range fi { if ff.IsDir() || path.Ext(ff.Name()) != ".so" { continue } plugins = append(plugins, ff) pdll, err := plugin.Open(pluginDir + "/" + ff.Name()) if err != nil { fmt.Println(err) continue } plg, err := pdll.Lookup("Hello") if err != nil { panic(err) } plg.(func())() } } // go run basetype.go
Define the plug-in interface interface.
//------------------------------------------------------ // itf/itf1.go package itf type Printor interface{ Print(v interface{}) } //------------------------------------------------------ // plugins/p1.go package main import ( "fmt" "softplugin/itf" ) type ScreenPrintor struct{} func (ScreenPrintor)Print(v interface{}){ fmt.Println("p1p1 ",v) } func Install() Printor{ return &ScreenPrintor{} } //----------------------------------------------------- // soft/s1.go package main import ( "softplugin/itf" "os" "path" "plugin" "fmt" ) var( printors = make([]itf.Printor, 0) ) func main(){ //加载插件 pluginDir := "../plugins" //扫描文件夹下所有so文件 f, err := os.OpenFile(pluginDir, os.O_RDONLY, 0666) if err != nil { panic(err) } fi, err := f.Readdir(-1) if err != nil { panic(err) } plugins := make([]os.FileInfo, 0) for _, ff := range fi { if ff.IsDir() || path.Ext(ff.Name()) != ".so" { continue } plugins = append(plugins, ff) pdll, err := plugin.Open(pluginDir + "/" + ff.Name()) if err != nil { fmt.Println(err) continue } plg, err := pdll.Lookup("Hello") if err != nil { panic(err) } printors = append(printors, (plg.(func() itf.Printor))()) } for _, p := range printors { p.Print("pppp") } }
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