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使用-buildmode=shared和-linkshared标志减小Go中的插件(.so)大小

dynamic-library plugins go

Aleksander Alekseev · 技术社区 · 6 年前

我想通过删除插件和主程序中常用的符号来减小插件(.so文件)的大小,例如go运行时和标准库。

这是我的测试项目。

package main

import (
    "fmt"
    "os"
    "plugin"
)

type Plugin interface {
    SayHello()
    SayGoodbye()
}

func main() {
    if len(os.Args) < 2 {
        fmt.Fprintf(os.Stderr, "Usage: %s <plugin.so>\n", os.Args[0])
        os.Exit(1)
    }

    p, err := plugin.Open(os.Args[1])
    if err != nil {
        fmt.Fprintf(os.Stderr, "plugin.Open: %v\n", err)
        os.Exit(1)
    }

    piTemp, err := p.Lookup("Plugin")
    if err != nil {
        fmt.Fprintf(os.Stderr, "plugin.Open: %v\n", err)
        os.Exit(1)
    }

    pi, ok := piTemp.(Plugin)
    if !ok {
        fmt.Fprintf(os.Stderr, "Unable to cast helloTemp to Plugin interface\n")
        os.Exit(1)
    }

    pi.SayHello()
    pi.SayGoodbye()
}

插件/插件.go:

package main

import "fmt"

type PluginImpl struct {}

var Plugin PluginImpl

func (pi *PluginImpl) SayHello() {
    fmt.Printf("Hello from the plugin!\n")
}

func (pi *PluginImpl) SayGoodbye() {
    fmt.Printf("Goodbye from the plugin!\n")
}

建筑.sh:

#!/bin/sh

set -e

go clean ./...
go build
cd plugin
go build -buildmode=plugin

使用示例:

$ ./plugins-test ./plugin/plugin.so
Hello from the plugin!
Goodbye from the plugin!

我试着从 this article 我得到的是:

$ go install -buildmode=shared std
$ go install -buildmode=shared -linkshared go-sandbox/plugins-test
panic: runtime error: index out of range

goroutine 1 [running]:
cmd/go/internal/work.(*Builder).linkSharedAction.func2(0x84607e0)
    /usr/local/go/src/cmd/go/internal/work/action.go:745 +0x7dd
cmd/go/internal/work.(*Builder).cacheAction(0x8d7cfc0, 0x90fdd00, 0x14, 0x0, 0x8efc740, 0x90fdd00)
    /usr/local/go/src/cmd/go/internal/work/action.go:314 +0x84
cmd/go/internal/work.(*Builder).linkSharedAction(0x8d7cfc0, 0x1, 0x1, 0x8e2373a, 0x6, 0x8eec840, 0x8e2373a)
    /usr/local/go/src/cmd/go/internal/work/action.go:738 +0x201
cmd/go/internal/work.(*Builder).buildmodeShared(0x8d7cfc0, 0x1, 0x1, 0x8c18050, 0x1, 0x2, 0x0, 0x0, 0x0, 0x8eec840, ...)
    /usr/local/go/src/cmd/go/internal/work/action.go:649 +0xe8
cmd/go/internal/work.InstallPackages(0x8c18050, 0x1, 0x2, 0x0, 0x0, 0x0)
    /usr/local/go/src/cmd/go/internal/work/build.go:503 +0xb9c
cmd/go/internal/work.runInstall(0x884ae20, 0x8c18050, 0x1, 0x2)
    /usr/local/go/src/cmd/go/internal/work/build.go:417 +0x52
main.main()
    /usr/local/go/src/cmd/go/main.go:219 +0x8a4

在上的行为也是一样的 go1.11.2 linux/386 go1.11.2 linux/arm . 在MacOS上,这个功能似乎不见了--- -buildmode=shared not supported on darwin/amd64 .

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