117 lines
2.4 KiB
Go
117 lines
2.4 KiB
Go
package gui
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// This is based off of the excellent example and documentation here:
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// https://github.com/vladimirvivien/go-plugin-example
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// There truly are great people in this world.
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// It's a pleasure to be here with all of you
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import (
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"log"
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"os"
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"plugin"
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"github.com/davecgh/go-spew/spew"
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)
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// TODO: could a protobuf work here?
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type Greeter interface {
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Greet()
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JcarrButton()
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AddButton(string)
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}
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var PlugGocli *plugin.Plugin
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var PlugGocliOk bool
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var PlugHello *plugin.Plugin
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// var gBut plugin.Symbol
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var jcarrBut plugin.Symbol
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var symGreeter plugin.Symbol
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var greeter Greeter
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var ok bool
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var typeToolkit plugin.Symbol
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var typeToolkitCast Greeter
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func LoadPlugin(name string) *plugin.Plugin {
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scs := spew.ConfigState{MaxDepth: 1}
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// load module
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// 1. open the so file to load the symbols
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plug, err := plugin.Open(name)
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log.Println("plug =")
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log.Println(scs.Sdump(plug))
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if err != nil {
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log.Println(err)
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return nil
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}
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// 2. look up a symbol (an exported function or variable)
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// in this case, variable Greeter
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typeToolkit, err = plug.Lookup("Toolkit")
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log.Println("plugin.Toolkit", typeToolkit)
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log.Println(scs.Sdump(typeToolkit))
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if err != nil {
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log.Println(err)
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os.Exit(1)
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}
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symGreeter, err = plug.Lookup("Greeter")
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log.Println("symGreater", symGreeter)
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log.Println(scs.Sdump(symGreeter))
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if err != nil {
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log.Println(err)
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os.Exit(1)
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}
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// 3. Assert that loaded symbol is of a desired type
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// in this case interface type Greeter (defined above)
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// var greeter Greeter
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greeter, ok = symGreeter.(Greeter)
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log.Println("greeter", symGreeter)
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log.Println(scs.Sdump(greeter))
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if !ok {
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log.Println("unexpected type from module symbol")
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os.Exit(1)
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}
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/*
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typeToolkitCast, ok = typeToolkit.(Greeter)
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if !ok {
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log.Println("unexpected cast of Toolkit to Greeter")
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os.Exit(1)
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}
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*/
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return plug
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}
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func RunGreet() {
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log.Println("gui.RunGreet() START")
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if (greeter == nil) {
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log.Println("wit/gui gocui plugin didn't load")
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return
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}
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PlugGocliOk = true
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greeter.Greet()
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}
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func LookupJcarrButton() {
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log.Println("lookupJcarrButton() START")
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if (greeter == nil) {
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log.Println("wit/gui gocui plugin didn't load")
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return
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}
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greeter.JcarrButton()
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}
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func GocuiAddButton(name string) {
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log.Println("GocuiAddButton() START", name)
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if (greeter == nil) {
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log.Println("wit/gui gocui plugin didn't load")
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return
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}
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greeter.AddButton(name)
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}
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