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main.go
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main.go
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package main
import (
"flag"
"fmt"
"log"
"os"
"os/signal"
"syscall"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/ecs"
"github.com/wpalmer/ecscron/schedule"
"github.com/wpalmer/ecscron/schedule/crontab"
"github.com/wpalmer/ecscron/schedule/retry"
"github.com/wpalmer/ecscron/taskrunner"
"github.com/wpalmer/ecscron/taskrunner/ecstaskrunner"
"github.com/wpalmer/ecscron/taskrunner/tweak"
)
const (
DEBUG_ERROR = 0
DEBUG_INFO = 1
DEBUG_DETAIL = 2
DEBUG_STATUS = 5
)
type simulatedStatus struct {
TaskName string
}
func main() {
var async string
var doPause bool
var maxPause string
var maxPauseDuration time.Duration
var prevTick time.Time
var nextTick time.Time
var timezone string
var cluster string
var prefix string
var suffix string
var region string
var filePath string
var doRetry bool
var retryCount int64
var simulate bool
var verbosity int
var doDump bool
var dumpFrom string
var dumpFromTime time.Time
var dumpUntil string
var dumpUntilTime time.Time
var dumpFormat string
first := true
flag.StringVar(&timezone, "timezone", "UTC", "The TimeZone in which to evaluate cron expressions")
flag.StringVar(&async, "async", "", "The \"last run\" of cron (to resume after interruption) in YYYY-MM-DD HH:mm:ss format")
flag.BoolVar(&doPause, "pause", false, "Start cron in a 'paused' state, awaiting SIGUSR1 to resume")
flag.StringVar(&maxPause, "max-pause", "", "Maximum amount of time cron may be paused, prior to resuming eg: '10m'")
flag.BoolVar(&doRetry, "retry", false, "When true, any failed run-task will be attempted again in the next iteration (same as -retry-count=-1)")
flag.Int64Var(&retryCount, "retry-count", 0, "The number of times to retry a failed run-task before giving up (-1 means forever)")
flag.StringVar(&cluster, "cluster", "", "The ECS Cluster on which to run tasks")
flag.StringVar(®ion, "region", "", "The AWS Region in which the ECS Cluster resides")
flag.StringVar(&filePath, "crontab", "/etc/ecscrontab", "The location of the crontab file to parse")
flag.StringVar(&prefix, "prefix", "", "An optional prefix to add to all ECS Task names within the crontab")
flag.StringVar(&suffix, "suffix", "", "An optional suffix to add to all ECS Task names within the crontab")
flag.BoolVar(&simulate, "simulate", false, "When true, don't actually run anything, only print what would be run")
flag.IntVar(&verbosity, "debug", 0, "Debug level 0 = errors/warnings, 1 = run info, 2 = detail, 5 = status")
flag.BoolVar(&doDump, "dump", false, "Rather than running the cron, output a summary of the schedule")
flag.StringVar(&dumpFrom, "dump-from", "", "Output the schedule up starting from the specified time, in YYYY-MM-DD HH:mm:ss format")
flag.StringVar(&dumpUntil, "dump-until", "", "Output the schedule up until the specified time, in YYYY-MM-DD HH:mm:ss format")
flag.StringVar(&dumpFormat, "dump-format", "", "Output the schedule in the specified format. Currently the only supported format is 'json'")
flag.Parse()
location, err := time.LoadLocation(timezone)
if err != nil {
log.Fatalf("Failed to parse timzeone: %s", err)
}
if async != "" {
prevTick, err = time.ParseInLocation("2006-01-02 15:04:05", async, location)
if err != nil {
log.Fatalf("Failed to parse time of last run: %s", err)
}
first = false
}
if maxPause != "" {
maxPauseDuration, err = time.ParseDuration(maxPause)
if err != nil {
log.Fatalf("Failed to parse maximum pause duration: %s", err)
}
}
if doRetry && retryCount == int64(0) {
retryCount = -1
}
file, err := os.Open(filePath)
if err != nil {
log.Fatalf("Error opening crontab: %s", err)
}
var sched schedule.Schedule
table := crontab.NewCrontab()
if ok, err := table.Load(file); !ok {
log.Fatalf("Error loading crontab: %s", err)
}
sched = table
if retryCount != 0 {
numAttempts := retryCount
if numAttempts > 0 {
numAttempts += 1
}
sched = retry.NewRetrySchedule(sched, numAttempts)
}
var runner taskrunner.TaskRunner
if simulate {
runner = taskrunner.TaskRunnerFunc(func(task string) (*taskrunner.TaskStatus, error) {
log.Printf("[-simulate] Running: %s", task)
return &taskrunner.TaskStatus{Ran: true, Output: &simulatedStatus{TaskName: task}}, nil
})
} else {
awsConfig := aws.NewConfig()
if region != "" {
awsConfig = awsConfig.WithRegion(region)
}
awsSession := session.Must(session.NewSession(awsConfig))
ecsService := ecs.New(awsSession)
innerRunner := ecstaskrunner.NewEcsTaskRunner(ecsService, cluster)
runner = ecstaskrunner.NewEcsSkipRunningTaskRunner(ecsService, cluster, innerRunner)
}
if prefix != "" || suffix != "" {
runner = tweak.NewTweakTaskRunner(runner, func(task string) string {
return fmt.Sprintf("%s%s%s", prefix, task, suffix)
})
}
if dumpFrom != "" {
doDump = true
dumpFromTime, err = time.ParseInLocation("2006-01-02 15:04:05", dumpFrom, location)
if err != nil {
log.Fatalf("Failed to parse time to dump from: %s", err)
}
} else {
dumpFromTime = time.Now()
}
if dumpUntil != "" {
doDump = true
dumpUntilTime, err = time.ParseInLocation("2006-01-02 15:04:05", dumpUntil, location)
if err != nil {
log.Fatalf("Failed to parse time to dump until: %s", err)
}
} else {
dumpUntilTime = dumpFromTime.Add(time.Hour * 24)
}
if dumpFormat == "" {
dumpFormat = "json"
} else {
doDump = true
if dumpFormat != "json" {
log.Fatalf("Unknown dump format: %s", dumpFormat)
}
}
if doDump {
_, err := schedule.DumpJson(os.Stdout, sched, dumpFromTime.Add(-1), dumpUntilTime)
if err != nil {
log.Fatalf("Failed to dump schedule: %s", err)
}
fmt.Printf("\n")
os.Exit(0)
}
if first {
prevTick = time.Now().In(location)
}
signals := make(chan os.Signal, 2)
if doPause {
signals <- syscall.SIGUSR1
}
signal.Notify(signals, syscall.SIGUSR1, syscall.SIGINT)
ticks := make(chan time.Time, 1)
for {
nextTick = sched.Next(prevTick)
pause := nextTick.Sub(time.Now().In(location))
if pause < time.Duration(0) {
log.Printf("Cron tasks running slowly: %0.2f seconds late entering tick scheduled for %v",
(pause * time.Duration(-1)).Seconds(), nextTick)
ticks <- nextTick
} else {
if verbosity >= DEBUG_STATUS {
log.Printf("Sleeping for %0.2f seconds", pause.Seconds())
}
go func() {
time.Sleep(pause)
ticks <- nextTick
}()
}
ticked := false
for ticked == false {
select {
case <-ticks:
ticked = true
case oneSignal := <-signals:
switch oneSignal {
case syscall.SIGINT:
log.Fatalf("Received SIGINT, exiting...")
case syscall.SIGUSR1:
if doPause {
doPause = false
log.Printf("Pausing, send SIGUSR1 to resume...")
} else {
log.Printf("Received SIGUSR1, pausing...")
}
var maxPauseChannel <-chan time.Time
var maxPauseTimer *time.Timer
if maxPause != "" {
maxPauseTimer = time.NewTimer(maxPauseDuration)
maxPauseChannel = maxPauseTimer.C
} else {
maxPauseChannel = make(<-chan time.Time, 0)
}
select {
case <-maxPauseChannel:
log.Printf("Maximum Pause Duration exceeded without receiving SIGUSR1, resuming...")
case oneSignal := <-signals:
maxPauseTimer.Stop()
switch oneSignal {
case syscall.SIGINT:
log.Fatalf("Received SIGINT while paused, exiting...")
case syscall.SIGUSR1:
log.Printf("Received SIGUSR1 while paused, resuming...")
}
}
}
}
}
prevTick = nextTick
results, err := sched.Tick(runner, nextTick)
if err != nil {
log.Fatalf("Fatal error in tick: %s", err)
}
for task, result := range results {
if verbosity >= DEBUG_DETAIL {
switch info := result.Info.(type) {
default:
case *retry.RetryInfo:
if info.MaxRetries > 0 {
log.Printf("Retrying %s (attempt %d of %d)\n",
task, info.Attempt, info.MaxRetries)
} else {
log.Printf("Retrying %s (attempt %d)\n", task, info.Attempt)
}
}
}
if result.Ran {
if verbosity >= DEBUG_DETAIL {
switch output := result.Output.(type) {
default:
log.Printf("%s Scheduled to Run via an unknown method", task)
case *simulatedStatus:
log.Printf("[-simulate] %s Would have been scheduled to run as %s", task, output.TaskName)
case *ecs.RunTaskOutput:
for _, scheduledTask := range output.Tasks {
log.Printf("%s Scheduled to run on Container Instance %s using Task Definition %s\n",
task, *scheduledTask.ContainerInstanceArn, *scheduledTask.TaskDefinitionArn)
}
}
}
} else {
if result.Error != nil {
log.Printf("Error when running task '%s': %s", task, result.Error)
}
for _, warning := range result.Warnings {
log.Printf("Warning when running task '%s': %s", task, warning)
}
}
}
}
}