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basictaskcommon.go
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basictaskcommon.go
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/*
* === This file is part of ALICE O² ===
*
* Copyright 2020 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 executable
import (
"bytes"
"encoding/json"
"errors"
"io"
"os/exec"
"syscall"
"github.com/AliceO2Group/Control/common/controlmode"
"github.com/AliceO2Group/Control/common/event"
"github.com/AliceO2Group/Control/core/controlcommands"
"github.com/AliceO2Group/Control/executor/executorcmd"
"github.com/AliceO2Group/Control/executor/executorcmd/transitioner"
pb "github.com/AliceO2Group/Control/executor/protos"
mesos "github.com/mesos/mesos-go/api/v1/lib"
"github.com/sirupsen/logrus"
)
type basicTaskBase struct {
taskBase
taskCmd *exec.Cmd
transitioner transitioner.Transitioner
pendingFinalTaskStateCh chan mesos.TaskState
}
func (t *basicTaskBase) startBasicTask() (err error) {
t.taskCmd, err = prepareTaskCmd(t.Tci)
if err != nil {
msg := "cannot build task command"
log.WithFields(logrus.Fields{
"id": t.ti.TaskID.Value,
"task": t.ti.Name,
"error": err,
}).
Error(msg)
return err
}
if t.taskCmd == nil {
return errors.New("could not instantiate basic task command")
}
// Set up pipes for controlled process
var errStdout, errStderr error
var stdoutBuf, stderrBuf bytes.Buffer
stdoutLog := log.WithPrefix("task-stdout").WithField("task", t.ti.Name).WriterLevel(logrus.TraceLevel)
stderrLog := log.WithPrefix("task-stderr").WithField("task", t.ti.Name).WriterLevel(logrus.TraceLevel)
// Each of these multiwriters will push incoming lines to a buffer as well as the logger
stdout := io.MultiWriter(stdoutLog, &stdoutBuf)
stderr := io.MultiWriter(stderrLog, &stderrBuf)
stdoutIn, _ := t.taskCmd.StdoutPipe()
stderrIn, _ := t.taskCmd.StderrPipe()
err = t.taskCmd.Start()
if err != nil {
log.WithFields(logrus.Fields{
"id": t.ti.TaskID.Value,
"task": t.ti.Name,
"error": err,
"command": *t.Tci.Value,
}).
Error("failed to run basic task")
return err
}
log.WithField("id", t.ti.TaskID.Value).
WithField("task", t.ti.Name).
Debug("basic task started")
go func() {
_, errStdout = io.Copy(stdout, stdoutIn)
}()
go func() {
_, errStderr = io.Copy(stderr, stderrIn)
}()
go func() {
err = t.taskCmd.Wait()
// ^ when this unblocks, the task is done
pendingState := mesos.TASK_FINISHED
if err != nil {
log.WithFields(logrus.Fields{
"id": t.ti.TaskID.Value,
"task": t.ti.Name,
"error": err.Error(),
}).
Error("process terminated with error")
pendingState = mesos.TASK_FAILED
}
// Can be -1 if the process was killed
exitCode := t.taskCmd.ProcessState.ExitCode()
processTerminatedOnItsOwn := true
select {
case pending := <- t.pendingFinalTaskStateCh:
pendingState = pending
processTerminatedOnItsOwn = false
default:
}
if errStdout != nil || errStderr != nil {
log.WithFields(logrus.Fields{
"errStderr": errStderr,
"errStdout": errStdout,
"id": t.ti.TaskID.Value,
"task": t.ti.Name,
}).
Warning("failed to capture stdout or stderr of task")
}
deo := event.DeviceEventOrigin{
AgentId: t.ti.AgentID,
ExecutorId: t.ti.GetExecutor().ExecutorID,
TaskId: t.ti.TaskID,
}
deviceEvent := event.NewDeviceEvent(deo, pb.DeviceEventType_BASIC_TASK_TERMINATED)
if btt, ok := deviceEvent.(*event.BasicTaskTerminated); ok {
btt.VoluntaryTermination = processTerminatedOnItsOwn
btt.ExitCode = exitCode
btt.FinalMesosState = pendingState
btt.Stderr = stderrBuf.String()
btt.Stdout = stdoutBuf.String()
t.sendDeviceEvent(btt)
}
}()
return err
}
func (t *basicTaskBase) ensureBasicTaskKilled() (err error) {
if t.taskCmd == nil {
return nil
}
if t.Tci.ControlMode == controlmode.HOOK {
return nil
}
if t.taskCmd.ProcessState.Exited() {
return nil
}
// Preparing to kill running task
t.pendingFinalTaskStateCh <- mesos.TASK_KILLED
// TODO: SIGTERM before SIGKILL
pid := t.taskCmd.Process.Pid
err = syscall.Kill(-pid, syscall.SIGKILL)
if err != nil {
log.WithError(err).
WithField("taskId", t.ti.GetTaskID()).
Warning("could not kill task")
}
return
}
func (t *basicTaskBase) doLaunch(transitionFunc transitioner.DoTransitionFunc) error {
t.pendingFinalTaskStateCh = make(chan mesos.TaskState, 1) // we use this to receive a pending status update if the task was killed
if t.taskCmd != nil {
return errors.New("bad internal state for basic task command")
}
t.transitioner = transitioner.NewTransitioner(t.Tci.ControlMode, transitionFunc)
log.WithField("payload", string(t.ti.GetData()[:])).
WithField("task", t.ti.Name).
Debug("basic task staged")
go t.sendStatus(mesos.TASK_RUNNING, "")
return nil
}
func (t *basicTaskBase) UnmarshalTransition(data []byte) (cmd *executorcmd.ExecutorCommand_Transition, err error) {
cmd = new(executorcmd.ExecutorCommand_Transition)
cmd.Transitioner = t.transitioner
err = json.Unmarshal(data, cmd)
if err != nil {
cmd = nil
}
return
}
func (t *basicTaskBase) Transition(cmd *executorcmd.ExecutorCommand_Transition) *controlcommands.MesosCommandResponse_Transition {
newState, transitionError := cmd.Commit()
response := cmd.PrepareResponse(transitionError, newState, t.ti.TaskID.Value)
return response
}
func (t *basicTaskBase) Kill() error {
if t.taskCmd != nil {
t.taskCmd = nil
log.Debug("exec.Cmd wrapper removed")
}
go t.sendStatus(mesos.TASK_FINISHED, "")
return nil
}