The go-bind-plugin from wendigo

go-bind-plugin's Introduction

Hi there stranger 👋

My name is Mateusz 'Serafin' Gajewski and I'm a Staff Software Engineer at Starburst Data which is a company behind the development of the Trino query engine (a.k.a. PrestoSQL)

You can find more details about me on my website wendigo.pl.

Feel free to reach me if you want to ask me about anything 🙂

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go-bind-plugin's Issues

Generates wrong code

with this plugin it seems to generate wrong code :(

package main

import (
	"C"
	"fmt"
	"gitlab.com/IRSH/irshGoFramework/plugins/types"
)

// pluginName of the Web Plugin
const PluginName = "web"

type PluginStruct struct {
	types.DefaultPlugin
}

func (p PluginStruct) Greet() {
	fmt.Println("Hello Universe")
}

// Define Plugin (Web=false as it otherwise would create a dependency loop)
var Plugin = PluginStruct{
	DefaultPlugin: types.NewDefaultPlugin(PluginName, false),
}

The result code is

package main

// Autogenerated by github.com/wendigo/go-bind-plugin on 2017-08-10 16:28:47.266724012 +0000 UTC, do not edit!
// Command: go-bind-plugin -plugin-path ../../../../plugins/web.so -plugin-package ./plugins -output-name WebPlugin -output-path ./plugin_api.go -output-package main -dereference-vars -rebuild
//
// Plugin ../../../../plugins/web.so info:
// - package: gitlab.com/IRSH/irshGoFramework/plugins
// - size: 3181200 bytes
// - sha256: cbd1f0c407ac3405ea31b0ab692cc397c1ef4bbbe33c1d82d46059b9a761117c

import (
        "fmt"
        "main"
        "plugin"
        "reflect"
        "strings"
)

// WebPlugin wraps symbols (functions and variables) exported by plugin gitlab.com/IRSH/irshGoFramework/plugins
//
// See docs at https://godoc.org/gitlab.com/IRSH/irshGoFramework/plugins
type WebPlugin struct {
        // Exported functions

        // Exported variables (public references)

        // See docs at https://godoc.org/gitlab.com/IRSH/irshGoFramework/plugins#Plugin
        Plugin main.PluginStruct
}

// String returnes textual representation of the wrapper. It provides info on exported symbols and variables.
func (p *WebPlugin) String() string {
        var lines []string
        lines = append(lines, "Struct WebPlugin:")
        lines = append(lines, "\t- Generated on: 2017-08-10 16:28:47.266724012 +0000 UTC")
        lines = append(lines, "\t- Command: go-bind-plugin -plugin-path ../../../../plugins/web.so -plugin-package ./plugins -output-name WebPlugin -output-path ./plugin_api.go -output-package main -dereference-vars -rebuild")
        lines = append(lines, "\nPlugin info:")
        lines = append(lines, "\t- package: gitlab.com/IRSH/irshGoFramework/plugins")
        lines = append(lines, "\t- sha256 sum: cbd1f0c407ac3405ea31b0ab692cc397c1ef4bbbe33c1d82d46059b9a761117c")
        lines = append(lines, "\t- size: 3181200 bytes")
        lines = append(lines, "\nExported functions (0):")

        lines = append(lines, "\nExported variables (1):")
        lines = append(lines, "\t- Plugin main.PluginStruct")

        return strings.Join(lines, "\n")
}

// BindWebPlugin loads plugin from the given path and binds symbols (variables and functions)
// to the WebPlugin struct. All variables are derefenenced.
func BindWebPlugin(path string) (*WebPlugin, error) {
        p, err := plugin.Open(path)

        if err != nil {
                return nil, fmt.Errorf("could not open plugin: %s", err)
        }

        ret := new(WebPlugin)

        varPlugin, err := p.Lookup("Plugin")
        if err != nil {
                return nil, fmt.Errorf("could not import variable 'Plugin', symbol not found: %s", err)
        }

        if typed, ok := varPlugin.(*main.PluginStruct); ok {
                ret.Plugin = *typed
        } else {
                return nil, fmt.Errorf("could not import variable 'Plugin', incompatible types 'main.PluginStruct' and '%s'", reflect.TypeOf(varPlugin))
        }

        return ret, nil
}