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task.go
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task.go
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/*
http://www.apache.org/licenses/LICENSE-2.0.txt
Copyright 2015 Intel Corporation
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package scheduler
import (
"errors"
"fmt"
"net"
"strconv"
"sync"
"time"
log "github.com/Sirupsen/logrus"
"github.com/intelsdi-x/gomit"
"github.com/pborman/uuid"
"github.com/intelsdi-x/snap/core"
"github.com/intelsdi-x/snap/core/scheduler_event"
"github.com/intelsdi-x/snap/grpc/controlproxy"
"github.com/intelsdi-x/snap/pkg/schedule"
"github.com/intelsdi-x/snap/scheduler/wmap"
)
const (
// DefaultDeadlineDuration - The default timeout is 5 second
DefaultDeadlineDuration = time.Second * 5
// DefaultStopOnFailure - The default stopping a failure is after three tries
DefaultStopOnFailure = 3
)
var (
taskLogger = schedulerLogger.WithField("_module", "scheduler-task")
// ErrTaskNotFound - The error message for task not found
ErrTaskNotFound = errors.New("Task not found")
// ErrTaskNotStopped - The error message for task must be stopped
ErrTaskNotStopped = errors.New("Task must be stopped")
// ErrTaskHasAlreadyBeenAdded - The error message for task has already been added
ErrTaskHasAlreadyBeenAdded = errors.New("Task has already been added")
// ErrTaskDisabledOnFailures - The error message for task disabled due to consecutive failures
ErrTaskDisabledOnFailures = errors.New("Task disabled due to consecutive failures")
// ErrTaskNotDisabled - The error message for task must be disabled
ErrTaskNotDisabled = errors.New("Task must be disabled")
)
type task struct {
sync.Mutex //protects state
id string
name string
schResponseChan chan schedule.Response
killChan chan struct{}
schedule schedule.Schedule
workflow *schedulerWorkflow
state core.TaskState
creationTime time.Time
lastFireTime time.Time
manager managesWork
metricsManager managesMetrics
deadlineDuration time.Duration
hitCount uint
missedIntervals uint
failureMutex sync.Mutex
failedRuns uint
lastFailureMessage string
lastFailureTime time.Time
stopOnFailure int
eventEmitter gomit.Emitter
RemoteManagers managers
}
//NewTask creates a Task
func newTask(s schedule.Schedule, wf *schedulerWorkflow, m *workManager, mm managesMetrics, emitter gomit.Emitter, opts ...core.TaskOption) (*task, error) {
//Task would always be given a default name.
//However if a user want to change this name, she can pass optional arguments, in form of core.TaskOption
//The new name then get over written.
taskID := uuid.New()
name := fmt.Sprintf("Task-%s", taskID)
wf.eventEmitter = emitter
mgrs := newManagers(mm)
err := createTaskClients(&mgrs, wf)
if err != nil {
return nil, err
}
task := &task{
id: taskID,
name: name,
schResponseChan: make(chan schedule.Response),
schedule: s,
state: core.TaskStopped,
creationTime: time.Now(),
workflow: wf,
manager: m,
metricsManager: mm,
deadlineDuration: DefaultDeadlineDuration,
stopOnFailure: DefaultStopOnFailure,
eventEmitter: emitter,
RemoteManagers: mgrs,
}
//set options
for _, opt := range opts {
opt(task)
}
return task, nil
}
// Option sets the options specified.
// Returns an option to optionally restore the last arg's previous value.
func (t *task) Option(opts ...core.TaskOption) core.TaskOption {
var previous core.TaskOption
for _, opt := range opts {
previous = opt(t)
}
return previous
}
//Returns the name of the task
func (t *task) GetName() string {
return t.name
}
func (t *task) SetName(name string) {
t.name = name
}
// CreateTime returns the time the task was created.
func (t *task) CreationTime() *time.Time {
return &t.creationTime
}
func (t *task) DeadlineDuration() time.Duration {
return t.deadlineDuration
}
func (t *task) SetDeadlineDuration(d time.Duration) {
t.deadlineDuration = d
}
func (t *task) SetTaskID(id string) {
t.id = id
}
// HitCount returns the number of times the task has fired.
func (t *task) HitCount() uint {
return t.hitCount
}
// Id returns the tasks Id.
func (t *task) ID() string {
return t.id
}
// LastRunTime returns the time of the tasks last run.
func (t *task) LastRunTime() *time.Time {
return &t.lastFireTime
}
// MissedCount returns the number of intervals missed.
func (t *task) MissedCount() uint {
return t.missedIntervals
}
// FailedRuns returns the number of intervals missed.
func (t *task) FailedCount() uint {
return t.failedRuns
}
// LastFailureMessage returns the last error from a task run
func (t *task) LastFailureMessage() string {
return t.lastFailureMessage
}
// State returns state of the task.
func (t *task) State() core.TaskState {
return t.state
}
// Status returns the state of the workflow.
func (t *task) Status() WorkflowState {
return t.workflow.State()
}
func (t *task) SetStopOnFailure(v int) {
t.stopOnFailure = v
}
func (t *task) SetID(id string) {
t.id = id
}
func (t *task) GetStopOnFailure() int {
return t.stopOnFailure
}
// Spin will start a task spinning in its own routine while it waits for its
// schedule.
func (t *task) Spin() {
// We need to lock long enough to change state
t.Lock()
defer t.Unlock()
// Reset the lastFireTime at each Spin.
// This ensures misses are tracked only forward of the point
// in time that a task starts spinning. E.g. stopping a task,
// waiting a period of time, and starting the task won't show
// misses for the interval while stopped.
t.lastFireTime = time.Now()
if t.state == core.TaskStopped {
t.state = core.TaskSpinning
t.killChan = make(chan struct{})
// spin in a goroutine
go t.spin()
}
}
func (t *task) Stop() {
t.Lock()
defer t.Unlock()
if t.state == core.TaskFiring || t.state == core.TaskSpinning {
t.state = core.TaskStopping
close(t.killChan)
}
}
//Enable changes the state from Disabled to Stopped
func (t *task) Enable() error {
t.Lock()
defer t.Unlock()
if t.state != core.TaskDisabled {
return ErrTaskNotDisabled
}
t.state = core.TaskStopped
return nil
}
func (t *task) Kill() {
t.Lock()
defer t.Unlock()
if t.state == core.TaskFiring || t.state == core.TaskSpinning {
close(t.killChan)
t.state = core.TaskDisabled
}
}
func (t *task) WMap() *wmap.WorkflowMap {
return t.workflow.workflowMap
}
func (t *task) Schedule() schedule.Schedule {
return t.schedule
}
func (t *task) spin() {
var consecutiveFailures int
for {
taskLogger.Debug("task spin loop")
// Start go routine to wait on schedule
go t.waitForSchedule()
// wait here on
// schResponseChan - response from schedule
// killChan - signals task needs to be stopped
select {
case sr := <-t.schResponseChan:
switch sr.State() {
// If response show this schedule is stil active we fire
case schedule.Active:
t.missedIntervals += sr.Missed()
t.lastFireTime = time.Now()
t.hitCount++
t.fire()
if t.lastFailureTime == t.lastFireTime {
consecutiveFailures++
taskLogger.WithFields(log.Fields{
"_block": "spin",
"task-id": t.id,
"task-name": t.name,
"consecutive failures": consecutiveFailures,
"consecutive failure limit": t.stopOnFailure,
"error": t.lastFailureMessage,
}).Warn("Task failed")
} else {
consecutiveFailures = 0
}
if t.stopOnFailure >= 0 && consecutiveFailures >= t.stopOnFailure {
taskLogger.WithFields(log.Fields{
"_block": "spin",
"task-id": t.id,
"task-name": t.name,
"consecutive failures": consecutiveFailures,
"error": t.lastFailureMessage,
}).Error(ErrTaskDisabledOnFailures)
// You must lock on state change for tasks
t.Lock()
t.state = core.TaskDisabled
t.Unlock()
// Send task disabled event
event := new(scheduler_event.TaskDisabledEvent)
event.TaskID = t.id
event.Why = fmt.Sprintf("Task disabled with error: %s", t.lastFailureMessage)
defer t.eventEmitter.Emit(event)
return
}
// Schedule has ended
case schedule.Ended:
// You must lock task to change state
t.Lock()
t.state = core.TaskEnded
t.Unlock()
return //spin
// Schedule has errored
case schedule.Error:
// You must lock task to change state
t.Lock()
t.state = core.TaskDisabled
t.Unlock()
return //spin
}
case <-t.killChan:
// Only here can it truly be stopped
t.Lock()
t.state = core.TaskStopped
t.lastFireTime = time.Time{}
t.Unlock()
return
}
}
}
func (t *task) fire() {
t.Lock()
defer t.Unlock()
t.state = core.TaskFiring
t.workflow.Start(t)
t.state = core.TaskSpinning
}
func (t *task) waitForSchedule() {
select {
case <-t.killChan:
return
case t.schResponseChan <- t.schedule.Wait(t.lastFireTime):
}
}
// RecordFailure updates the failed runs and last failure properties
func (t *task) RecordFailure(e []error) {
// We synchronize this update to ensure it is atomic
t.failureMutex.Lock()
defer t.failureMutex.Unlock()
t.failedRuns++
t.lastFailureTime = t.lastFireTime
t.lastFailureMessage = e[len(e)-1].Error()
}
type taskCollection struct {
*sync.Mutex
table map[string]*task
}
func newTaskCollection() *taskCollection {
return &taskCollection{
Mutex: &sync.Mutex{},
table: make(map[string]*task),
}
}
// Get given a task id returns a Task or nil if not found
func (t *taskCollection) Get(id string) *task {
t.Lock()
defer t.Unlock()
if t, ok := t.table[id]; ok {
return t
}
return nil
}
// Add given a reference to a task adds it to the collection of tasks. An
// error is returned if the task already exists in the collection.
func (t *taskCollection) add(task *task) error {
t.Lock()
defer t.Unlock()
if _, ok := t.table[task.id]; !ok {
//If we don't already have this task in the collection save it
t.table[task.id] = task
} else {
taskLogger.WithFields(log.Fields{
"_module": "scheduler-taskCollection",
"_block": "add",
"task id": task.id,
}).Error(ErrTaskHasAlreadyBeenAdded.Error())
return ErrTaskHasAlreadyBeenAdded
}
return nil
}
// remove will remove a given task from tasks. The task must be stopped.
// Can return errors ErrTaskNotFound and ErrTaskNotStopped.
func (t *taskCollection) remove(task *task) error {
t.Lock()
defer t.Unlock()
if _, ok := t.table[task.id]; ok {
if task.state != core.TaskStopped && task.state != core.TaskDisabled {
taskLogger.WithFields(log.Fields{
"_block": "remove",
"task id": task.id,
}).Error(ErrTaskNotStopped)
return ErrTaskNotStopped
}
delete(t.table, task.id)
} else {
taskLogger.WithFields(log.Fields{
"_block": "remove",
"task id": task.id,
}).Error(ErrTaskNotFound)
return ErrTaskNotFound
}
return nil
}
// Table returns a copy of the taskCollection
func (t *taskCollection) Table() map[string]*task {
t.Lock()
defer t.Unlock()
tasks := make(map[string]*task)
for id, t := range t.table {
tasks[id] = t
}
return tasks
}
// createTaskClients walks the workflowmap and creates clients for this task
// remoteManagers so that nodes that require proxy request can make them.
func createTaskClients(mgrs *managers, wf *schedulerWorkflow) error {
return walkWorkflow(wf.processNodes, wf.publishNodes, mgrs)
}
func walkWorkflow(prnodes []*processNode, pbnodes []*publishNode, mgrs *managers) error {
for _, pr := range prnodes {
if pr.Target != "" {
host, port, err := net.SplitHostPort(pr.Target)
if err != nil {
return err
}
p, err := strconv.Atoi(port)
if err != nil {
return err
}
proxy, err := controlproxy.New(host, p)
if err != nil {
return err
}
mgrs.Add(pr.Target, proxy)
}
err := walkWorkflow(pr.ProcessNodes, pr.PublishNodes, mgrs)
if err != nil {
return err
}
}
for _, pu := range pbnodes {
if pu.Target != "" {
host, port, err := net.SplitHostPort(pu.Target)
if err != nil {
return err
}
p, err := strconv.Atoi(port)
if err != nil {
return err
}
proxy, err := controlproxy.New(host, p)
if err != nil {
return err
}
mgrs.Add(pu.Target, proxy)
}
}
return nil
}