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plugin.go
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plugin.go
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/*
* === This file is part of ALICE O² ===
*
* Copyright 2021 CERN and copyright holders of ALICE O².
* Author: Teo Mrnjavac <teo.mrnjavac@cern.ch>
*
* 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 <http://www.gnu.org/licenses/>.
*
* In applying this license CERN does not waive the privileges and
* immunities granted to it by virtue of its status as an
* Intergovernmental Organization or submit itself to any jurisdiction.
*/
package integration
import (
"sync"
"github.com/AliceO2Group/Control/common/logger"
"github.com/sirupsen/logrus"
"github.com/spf13/viper"
)
var log = logger.New(logrus.StandardLogger(), "integration")
var (
once sync.Once
instance Plugins
loaderOnce sync.Once
pluginLoaders map[string]func() Plugin
)
type Plugins []Plugin
type Plugin interface {
GetName() string
Init(instanceId string) error
ObjectStack(data interface{}) map[string]interface{}
Destroy() error
}
type NewFunc func(endpoint string) Plugin
func RegisterPlugin(pluginName string, endpointArgumentName string, newFunc NewFunc) {
loaderOnce.Do(func() {
pluginLoaders = make(map[string]func() Plugin)
})
pluginLoaders[pluginName] = func() Plugin {
if viper.IsSet(endpointArgumentName) {
endpoint := viper.GetString(endpointArgumentName)
return newFunc(endpoint)
}
return nil
}
}
func (p Plugins) InitAll(fid string) {
wg := &sync.WaitGroup{}
wg.Add(len(p))
for _, plugin := range p {
go func(plugin Plugin) {
defer wg.Done()
initErr := plugin.Init(fid)
if initErr != nil {
log.WithError(initErr).
WithField("plugin", plugin.GetName()).
Error("workflow plugin failed to initialize")
}
}(plugin)
}
wg.Wait()
}
func (p Plugins) DestroyAll() {
for _, plugin := range p {
err := plugin.Destroy()
if err != nil {
log.WithError(err).
WithField("plugin", plugin.GetName()).
Error("workflow plugin failed to destroy")
}
}
}
func (p Plugins) ObjectStack(data interface{}) (stack map[string]interface{}) {
stack = make(map[string]interface{})
for _, plugin := range p {
s := plugin.ObjectStack(data)
stack[plugin.GetName()] = s
}
return
}
func PluginsInstance() Plugins {
once.Do(func() {
instance = Plugins{}
pluginList := viper.GetStringSlice("integrationPlugins")
for _, pluginName := range pluginList {
if pluginLoaders == nil {
log.WithField("plugin", pluginName).
Error("requested plugin unavailable")
continue
}
pluginLoader, ok := pluginLoaders[pluginName]
if !ok {
log.WithField("plugin", pluginName).
Error("requested plugin unavailable")
continue
}
newPlugin := pluginLoader()
if newPlugin == nil {
log.WithField("plugin", pluginName).
Error("plugin loader failed")
continue
}
instance = append(instance, newPlugin)
}
})
return instance
}