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waiter.go
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waiter.go
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/*
* Copyright (c) 2018. Abstrium SAS <team (at) pydio.com>
* This file is part of Pydio Cells.
*
* Pydio Cells is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Pydio Cells 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with Pydio Cells. If not, see <http://www.gnu.org/licenses/>.
*
* The latest code can be found at <https://pydio.com>.
*/
package timer
import (
"strconv"
"strings"
"time"
"github.com/ajvb/kala/utils/iso8601"
"github.com/micro/go-micro/errors"
"github.com/pydio/cells/common"
"github.com/pydio/cells/common/proto/jobs"
)
// ScheduleWaiter provides an easy way to execute a job at given times (like a cron job).
type ScheduleWaiter struct {
*jobs.Schedule
jobId string
ticker chan *jobs.JobTriggerEvent
stopChan chan bool
// Number of repetitions: if 0, infinite repetition.
repeat int64
// Do not start until that time
startTime time.Time
// Interval between each repetition
interval time.Duration
lastTick time.Time
}
// NewScheduleWaiter creates a new waiter that sends start events for this job on the given schedule
func NewScheduleWaiter(jobId string, schedule *jobs.Schedule, tickerChannel chan *jobs.JobTriggerEvent) *ScheduleWaiter {
waiter := &ScheduleWaiter{}
waiter.Schedule = schedule
waiter.ParseSchedule()
waiter.jobId = jobId
waiter.ticker = tickerChannel
return waiter
}
// Start starts the waiter
func (w *ScheduleWaiter) Start() {
w.stopChan = make(chan bool)
w.WaitUntilNext()
}
// Stop simply stops the waiter
func (w *ScheduleWaiter) Stop() {
w.stopChan <- true
}
// WaitUntilNext implements the intelligence of the waiter.
func (w *ScheduleWaiter) WaitUntilNext() {
var wait time.Duration
if w.interval == 0 {
// This is not normal, this will trigger the job too many times
wait = 5 * time.Minute
} else {
wait = w.computeNextWait()
}
go func() {
for {
select {
case <-time.After(wait):
w.ticker <- &jobs.JobTriggerEvent{
JobID: w.jobId,
Schedule: w.Schedule,
}
w.lastTick = time.Now()
w.WaitUntilNext()
// TODO implement number of repetition management
return
case <-w.stopChan:
return
}
}
}()
}
func (w *ScheduleWaiter) computeNextWait() time.Duration {
now := time.Now()
var wait time.Duration
// First let's wait until start time
if wait = w.startTime.Sub(now); wait < 0 {
// Start time is behind us, let's have a look at intervals now
if w.lastTick.IsZero() {
// next start should be the rest of wait modulo interval
wait = wait%w.interval + w.interval
} else {
wait = w.lastTick.Add(w.interval).Sub(now) // Compute next run and diff
}
}
return wait
}
// ParseSchedule parses the given Iso 8601 string and stores corresponding values in the waiter to ease processing.
func (w *ScheduleWaiter) ParseSchedule() error {
parts := strings.Split(w.Iso8601Schedule, "/")
if len(parts) != 3 {
return errors.InternalServerError(common.SERVICE_TIMER, "Invalid format for schedule")
}
repeatString := parts[0]
startString := parts[1]
intervalString := parts[2]
var err error
if repeatString != "R" {
w.repeat, err = strconv.ParseInt(strings.TrimPrefix(parts[0], "R"), 10, 64)
if err != nil {
return err
}
}
w.startTime, err = time.Parse(time.RFC3339, startString)
if err != nil {
w.startTime, err = time.Parse("2006-01-02T15:04:05", startString)
if err != nil {
return err
}
}
if w.repeat > 1 || w.repeat == 0 {
isoDuration, er := iso8601.FromString(intervalString)
if er != nil {
return err
}
w.interval = isoDuration.ToDuration()
}
return nil
}