trident/plugins.go

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2021-04-22 02:29:14 +00:00
/*
* Copyright (C) 2021 Arsen Musayelyan
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package main
import (
"fmt"
"github.com/traefik/yaegi/interp"
"github.com/traefik/yaegi/stdlib"
"github.com/traefik/yaegi/stdlib/unrestricted"
"io/fs"
"path/filepath"
)
// Create type for plugin functions
type pluginFunc func(string, map[string]interface{})
// Initialize all available plugins
func initPlugins(gopath string) map[string]pluginFunc {
log.Info().Msg("Initializing plugins")
out := map[string]pluginFunc{}
// Create new yaegi Go interpreter with appropriate GOPATH
i := interp.New(interp.Options{GoPath: gopath})
// Use standard library symbols
i.Use(stdlib.Symbols)
// Use unrestricted symbols (os/exec, syscall, etc.)
i.Use(unrestricted.Symbols)
// Use custom package
i.Use(tridentSymbols)
// Walk plugin directory
err := filepath.WalkDir(filepath.Join(execDir, "plugins"), func(path string, d fs.DirEntry, err error) error {
// If error encountered, return
if err != nil {
return err
}
// If current path is not a directory or it is the plugin root
if !d.IsDir() || d.Name() == "plugins" {
return nil
}
// Get name of plugin from directory name
pluginName := filepath.Base(path)
// IF plugin already exists, return error
if _, ok := out[pluginName]; ok {
return fmt.Errorf("plugin %s has already been initialized", pluginName)
}
// If verbose, log which plugin is being initialized
if *verbose {
log.Debug().Str("plugin", pluginName).Msg("Initializing plugin")
}
// Walk directory of specific plugin
err = filepath.WalkDir(path, func(path string, d fs.DirEntry, err error) error {
// If error encountered, return
if err != nil {
return err
}
// If file is not go source, skip
if filepath.Ext(path) != ".go" {
return nil
}
// Evaluate go file
_, err = i.EvalPath(path)
if err != nil {
return err
}
return nil
})
// If error encountered walking plugin, return
if err != nil {
return err
}
// Get RunPlugin symbol from current plugin
v, err := i.Eval(fmt.Sprintf("%s.RunPlugin", pluginName))
if err != nil {
return err
}
// Assert RunPlugin symbol as a plugin function and add it to out map
out[pluginName] = v.Interface().(func(string, map[string]interface{}))
return nil
})
// If error occurred walking directory, log fatally
if err != nil {
log.Fatal().Err(err).Msg("Error initializing plugins")
}
return out
}