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eventStream.go
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eventStream.go
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/*
* === This file is part of ALICE O² ===
*
* Copyright 2020 CERN and copyright holders of ALICE O².
* Author: Miltiadis Alexis <miltiadis.alexis@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
import (
"sync"
pb "github.com/AliceO2Group/Control/core/protos"
"github.com/AliceO2Group/Control/common/event"
)
type Subscription interface {
Unsubscribe()
GetFeed() chan *pb.Event
Send(event.Event)
Err() <-chan error
}
type eventStream struct {
stream chan *pb.Event
}
func SubscribeToStream(ch chan *pb.Event) Subscription {
return &eventSub{
feed: &eventStream{
stream: ch,
},
err: make(chan error),
}
}
func (e *eventStream) send(data *pb.Event) {
if e.stream != nil {
e.stream <- data
}
}
func (e *eventStream) closeStream() {
close(e.stream)
e.stream = nil
}
type eventSub struct {
feed *eventStream
once sync.Once
err chan error
}
func (s *eventSub) Unsubscribe() {
s.once.Do(func() {
s.feed.closeStream()
close(s.err)
})
}
func (s *eventSub) GetFeed() chan *pb.Event {
return s.feed.stream
}
func (s *eventSub) Send(ev event.Event) {
var data *pb.Event
switch typedEvent := ev.(type) {
case *event.RoleEvent:
re := pb.Event_RoleEvent{
RoleEvent: &pb.Ev_RoleEvent{
Name: typedEvent.GetName(),
State: typedEvent.GetState(),
Status: typedEvent.GetStatus(),
RolePath: typedEvent.GetRolePath(),
},
}
data = pb.WrapEvent(&re)
case *event.TaskEvent:
re := pb.Event_TaskEvent{
TaskEvent: &pb.Ev_TaskEvent{
Name: typedEvent.GetName(),
Taskid: typedEvent.GetTaskID(),
State: typedEvent.GetState(),
Status: typedEvent.GetStatus(),
Hostname: typedEvent.GetHostname(),
ClassName: typedEvent.GetClassName(),
},
}
data = pb.WrapEvent(&re)
case *event.EnvironmentEvent:
re := pb.Event_EnvironmentEvent{
EnvironmentEvent: &pb.Ev_EnvironmentEvent{
EnvironmentId: typedEvent.GetName(),
State: typedEvent.GetState(),
CurrentRunNumber: typedEvent.GetRun(),
Error: typedEvent.GetError(),
Message: typedEvent.GetMessage(),
},
}
data = pb.WrapEvent(&re)
default:
// noop
}
s.feed.send(data)
}
func (s *eventSub) Err() <-chan error {
return s.err
}