/
main.go
130 lines (110 loc) · 3.4 KB
/
main.go
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package main
import (
"bytes"
"fmt"
"os"
"os/signal"
"strconv"
"strings"
"sync"
"syscall"
"time"
"github.com/BurntSushi/toml"
"github.com/olekukonko/tablewriter"
log "github.com/sirupsen/logrus"
"github.com/victorgama/cron"
"github.com/victorgama/ponos/drivers"
"github.com/victorgama/ponos/models"
)
var executions = map[string]int{}
var lock = sync.Mutex{}
const filePath = "./ponos.toml"
func main() {
logger := log.WithField("module", "boot")
lock.Lock()
logger.Infof("Hello! Ponos 2.0 booting up under PID %d...", os.Getpid())
logger.Info("Reading configuration from ponos.toml...")
if _, err := os.Stat("./ponos.toml"); os.IsNotExist(err) {
logger.Fatal("Cannot find ponos.toml in cwd. Stopping.")
}
var config models.Config
if _, err := toml.DecodeFile(filePath, &config); err != nil {
logger.Fatal("Error parsing ponos.toml:", err)
}
logger.Infof("Looking up for driver: %s", config.Driver)
driver := drivers.Get(config.Driver)
if driver == nil {
options := strings.Join(drivers.Available(), ", ")
logger.Fatalf("Cannot find driver named '%s'.\nAvailable options are: %s", config.Driver, options)
}
if err := driver.Configure(&config); err != nil {
logger.Fatal("Error configuring driver: %s", err)
}
logger.Infof("Building schedule...")
c := cron.New()
for k, v := range config.Schedule {
if err := c.AddNamedFunc(v.Period, k, createTask(k, v, driver)); err != nil {
log.WithField("module", "scheduler").WithError(err).Fatalf("Cannot schedule job")
}
}
c.Start()
log.Info("Built schedule:")
fmt.Printf("%s\n", outputSchedule(c, &config.Schedule))
go func() {
ch := make(chan os.Signal)
signal.Notify(ch, syscall.SIGINT, syscall.SIGTERM, syscall.SIGUSR1, syscall.SIGUSR2)
for sig := range ch {
switch sig {
case syscall.SIGINT, syscall.SIGTERM:
log.Info("Received termination signal. Stopping...")
c.Stop()
lock.Unlock()
case syscall.SIGUSR1:
log.Info("Gathering schedule...")
fmt.Println(outputSchedule(c, &config.Schedule))
log.Info("Done.")
case syscall.SIGUSR2:
log.Info("Dry-running entire schedule...")
for _, v := range config.Schedule {
driver.DryRun(v)
}
log.Info("Dry-run: Completed")
}
}
}()
fmt.Println()
log.Info("Sending signal USR1 displays information about the schedule and next runs")
log.Info(" USR2 dumps Redis commands used to perform all jobs (dry-run test)")
log.Info(" SIGTERM gracefully stops Ponos")
fmt.Println()
lock.Lock()
}
func createTask(name string, task *models.ScheduleItem, driver drivers.BaseDriver) func() {
return func() {
l := log.WithField("task", name)
if err := driver.Execute(task); err != nil {
l.WithError(err).Error("Failed")
} else {
l.Info("Enqueued")
executions[name] = executions[name] + 1
}
}
}
func outputSchedule(c *cron.Cron, schedule *map[string]*models.ScheduleItem) string {
data := [][]string{}
formatTime := func(t *time.Time) string {
if t.IsZero() {
return "Never"
}
return t.Format("Mon Jan, 2 15:04:05 MST")
}
for _, v := range c.Entries() {
data = append(data, []string{v.Name, formatTime(&v.Prev), formatTime(&v.Next), (*schedule)[v.Name].Period, strconv.Itoa(executions[v.Name])})
}
var b bytes.Buffer
table := tablewriter.NewWriter(&b)
table.SetHeader([]string{"Name", "Last Execution", "Next Execution", "Schedule", "Executions"})
table.AppendBulk(data)
table.Render()
return b.String()
}