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commandqueue.go
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178 lines (151 loc) · 4.21 KB
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/*
* === This file is part of ALICE O² ===
*
* Copyright 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 controlcommands
import (
"sync"
"github.com/AliceO2Group/Control/common/logger"
"github.com/sirupsen/logrus"
"errors"
"fmt"
"strings"
)
const QUEUE_SIZE = 1024
var log = logger.New(logrus.StandardLogger(), "cmdq")
type queueEntry struct {
cmd MesosCommand
callback chan<- MesosCommandResponse
}
type empty struct{}
type CommandQueue struct {
sync.Mutex
q chan queueEntry
servent *Servent
}
func NewCommandQueue(s *Servent) *CommandQueue {
return &CommandQueue{
servent: s,
}
}
func (m *CommandQueue) Enqueue(cmd MesosCommand, callback chan<- MesosCommandResponse) error {
m.Lock()
defer m.Unlock()
select {
case m.q <- queueEntry{cmd, callback}:
return nil
default: // Buffer full!
err := errors.New("the queue for MESSAGE commands is full")
log.WithField("error", err.Error()).
WithField("queueSize", QUEUE_SIZE).
Error("cannot enqueue control command")
return err
}
}
func (m* CommandQueue) Start() {
m.Lock()
m.q = make(chan queueEntry, QUEUE_SIZE)
m.Unlock()
go func() {
for {
select {
case entry, more := <-m.q:
m.Lock()
if !more { // if the channel is closed, we bail
return
}
response, err := m.commit(entry.cmd)
if err != nil {
log.Debug(err)
}
if response == nil {
log.Error("nil response")
}
entry.callback <- response
m.Unlock()
}
}
}()
}
func (m *CommandQueue) Stop() {
m.Lock()
defer m.Unlock()
close(m.q)
}
func (m *CommandQueue) commit(command MesosCommand) (response MesosCommandResponse, err error) {
if m == nil {
return nil, errors.New("command queue is nil")
}
// Parallel for
sendErrorList := make([]error, 0)
semaphore := make(chan empty, len(command.targets()))
responses := make(map[MesosCommandTarget]MesosCommandResponse)
log.WithFields(logrus.Fields{
"name": command.GetName(),
"id": command.GetId(),
}).
Debug("ready to commit MesosCommand")
for _, rec := range command.targets() {
go func(receiver MesosCommandTarget) {
log.WithFields(logrus.Fields{
"agentId": receiver.AgentId,
"executorId": receiver.ExecutorId,
"name": command.GetName(),
}).
Debug("sending MesosCommand to target")
singleCommand := command.MakeSingleTarget(receiver)
res, err := m.servent.RunCommand(singleCommand, receiver)
if err != nil {
log.WithError(err).Warning("MesosCommand send error")
sendErrorList = append(sendErrorList, err)
responses[receiver] = res
semaphore <- empty{}
return
}
log.WithFields(logrus.Fields{
"commandName": res.GetCommandName(),
"error": res.Err().Error(),
}).
Debug("received MesosCommandResponse")
responses[receiver] = res
semaphore <- empty{}
}(rec)
}
// Wait for goroutines to finish
for i := 0; i < len(command.targets()); i++ {
<- semaphore
}
close(semaphore)
log.WithFields(logrus.Fields{}).Debug("responses collected")
if len(sendErrorList) != 0 {
err = errors.New(strings.Join(func() (out []string) {
for i, e := range sendErrorList {
out = append(out, fmt.Sprintf("[%d] %s", i, e.Error()))
}
return
}(), "\n"))
return
}
response = consolidateResponses(command, responses)
log.Debug("responses consolidated, CommandQueue commit done")
return response, nil
}