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package koushin
import (
"fmt"
"path/filepath"
"github.com/labstack/echo/v4"
"github.com/yuin/gopher-lua"
"layeh.com/gopher-luar"
)
type Plugin interface {
Name() string
Render(name string, data interface{}) error
Close() error
}
type luaPlugin struct {
filename string
state *lua.LState
}
func (p *luaPlugin) Name() string {
return p.filename
}
func (p *luaPlugin) Render(name string, data interface{}) error {
global := p.state.GetGlobal("render")
if global == nil {
return nil
}
if err := p.state.CallByParam(lua.P{
Fn: global,
NRet: 0,
Protect: true,
}, lua.LString(name), luar.New(p.state, data)); err != nil {
return err
}
return nil
}
func (p *luaPlugin) Close() error {
p.state.Close()
return nil
}
func loadLuaPlugin(filename string) (*luaPlugin, error) {
l := lua.NewState()
if err := l.DoFile(filename); err != nil {
return nil, err
}
return &luaPlugin{filename, l}, nil
}
func loadAllLuaPlugins(log echo.Logger) ([]Plugin, error) {
filenames, err := filepath.Glob("plugins/*.lua")
if err != nil {
return nil, fmt.Errorf("filepath.Glob failed: %v", err)
}
plugins := make([]Plugin, 0, len(filenames))
for _, filename := range filenames {
log.Printf("Loading Lua plugin '%v'", filename)
p, err := loadLuaPlugin(filename)
if err != nil {
for _, p := range plugins {
p.Close()
}
return nil, fmt.Errorf("failed to load Lua plugin '%v': %v", filename, err)
}
plugins = append(plugins, p)
}
return plugins, nil
}
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