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environment.go
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172 lines (153 loc) · 4.34 KB
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/*
* === This file is part of ALICE O² ===
*
* Copyright 2017-2018 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 environment defines Environment, environment.Manager and
// other types and methods related to handling O² environments.
package environment
import (
"errors"
"sync"
"time"
"github.com/AliceO2Group/Control/common/logger"
"github.com/AliceO2Group/Control/core/workflow"
"github.com/gobwas/glob"
"github.com/looplab/fsm"
"github.com/pborman/uuid"
"github.com/sirupsen/logrus"
)
var log = logger.New(logrus.StandardLogger(),"env")
type Environment struct {
Mu sync.RWMutex
Sm *fsm.FSM
name string
id uuid.UUID
ts time.Time
workflow workflow.Role
wfAdapter *workflow.ParentAdapter
}
func newEnvironment() (env *Environment, err error) {
envId := uuid.NewUUID()
env = &Environment{
id: envId,
workflow: nil,
ts: time.Now(),
}
env.wfAdapter = workflow.NewParentAdapter(func() uuid.Array { return env.Id().Array() })
env.Sm = fsm.NewFSM(
"STANDBY",
fsm.Events{
{Name: "CONFIGURE", Src: []string{"STANDBY"}, Dst: "CONFIGURED"},
{Name: "RESET", Src: []string{"CONFIGURED"}, Dst: "STANDBY"},
{Name: "START_ACTIVITY", Src: []string{"CONFIGURED"}, Dst: "RUNNING"},
{Name: "STOP_ACTIVITY", Src: []string{"RUNNING"}, Dst: "CONFIGURED"},
{Name: "EXIT", Src: []string{"CONFIGURED", "STANDBY"}, Dst: "DONE"},
{Name: "GO_ERROR", Src: []string{"CONFIGURED", "RUNNING"}, Dst: "ERROR"},
{Name: "RECOVER", Src: []string{"ERROR"}, Dst: "STANDBY"},
},
fsm.Callbacks{
"enter_state": func(e *fsm.Event) {
log.WithFields(logrus.Fields{
"event": e.Event,
"src": e.Src,
"dst": e.Dst,
"environmentId": envId,
}).Debug("environment.sm entering state")
},
"before_event": env.handlerFunc(),
},
)
return
}
func (env *Environment) TryTransition(t Transition) (err error) {
err = t.check()
if err != nil {
return
}
err = env.Sm.Event(t.eventName(), t)
return
}
func (env *Environment) handlerFunc() func(e *fsm.Event) {
if env == nil {
return nil
}
return func(e *fsm.Event) {
log.WithFields(logrus.Fields{
"event": e.Event,
"src": e.Src,
"dst": e.Dst,
"environmentId": env.id.String(),
}).Debug("environment.sm starting transition")
transition, ok := e.Args[0].(Transition)
if !ok {
e.Cancel(errors.New("transition wrapping error"))
return
}
if transition.eventName() == e.Event {
transErr := transition.do(env)
if transErr != nil {
e.Cancel(transErr)
}
}
}
}
// Accessors
func (env *Environment) Id() uuid.UUID {
if env == nil {
return uuid.NIL
}
env.Mu.RLock()
defer env.Mu.RUnlock()
return env.id
}
func (env *Environment) CreatedWhen() time.Time {
if env == nil {
return time.Unix(0,0)
}
env.Mu.RLock()
defer env.Mu.RUnlock()
return env.ts
}
func (env *Environment) CurrentState() string {
if env == nil {
return ""
}
env.Mu.RLock()
defer env.Mu.RUnlock()
return env.Sm.Current()
}
func (env *Environment) Workflow() workflow.Role {
if env == nil {
return nil
}
env.Mu.RLock()
defer env.Mu.RUnlock()
return env.workflow
}
func (env *Environment) QueryRoles(pathSpec string) (rs []workflow.Role) {
g := glob.MustCompile(pathSpec, workflow.PATH_SEPARATOR_RUNE)
rs = env.workflow.GlobFilter(g)
return
}
func (env *Environment) GetPath() string {
return ""
}