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tasks.go
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tasks.go
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package tasks
import (
"context"
"errors"
"fmt"
"log"
"os"
"os/signal"
"syscall"
breverrors "github.com/brevdev/brev-cli/pkg/errors"
cron "github.com/robfig/cron/v3"
"github.com/sevlyar/go-daemon"
)
type RunTaskAsDaemonStore interface {
BuildBrevHome() error
GetBrevHomePath() (string, error)
}
func RunTaskAsDaemon(tasks []Task, store RunTaskAsDaemonStore) error {
err := store.BuildBrevHome()
if err != nil {
return breverrors.WrapAndTrace(err)
}
brevHome, err := store.GetBrevHomePath()
if err != nil {
return breverrors.WrapAndTrace(err)
}
pidFile := fmt.Sprintf("%s/task_daemon.pid", brevHome)
logFile := fmt.Sprintf("%s/task_daemon.log", brevHome)
cntxt := &daemon.Context{
PidFileName: pidFile,
PidFilePerm: 0o644,
LogFileName: logFile,
LogFilePerm: 0o640,
WorkDir: brevHome,
Umask: 0o27,
Args: []string{},
}
fmt.Printf("PID File: %s\n", pidFile)
fmt.Printf("Log File: %s\n", logFile)
d, err := cntxt.Reborn()
if err != nil {
if errors.Is(err, daemon.ErrWouldBlock) {
log.Print("daemon already running")
return nil
}
return breverrors.WrapAndTrace(err)
}
if d != nil {
return nil
}
log.Print("- - - - - - - - - - - - - - -")
log.Print("daemon started")
err = RunTasks(tasks)
if err != nil {
return breverrors.WrapAndTrace(err)
}
err = cntxt.Release()
if err != nil {
return breverrors.WrapAndTrace(err)
}
return nil
}
func RunTasks(tasks []Task) error {
d := NewTaskRunner(tasks)
err := d.Run()
if err != nil {
return breverrors.WrapAndTrace(err)
}
return nil
}
type Task interface {
Run() error
Configure() error
GetTaskSpec() TaskSpec
}
type TaskSpec struct {
Cron string // can be "" if want to run once // https://pkg.go.dev/github.com/robfig/cron?utm_source=godoc#hdr-CRON_Expression_Format
RunCronImmediately bool // only applied if cron not ""
}
type TaskRunner struct {
Tasks []Task
StopSignals chan os.Signal
}
func NewTaskRunner(tasks []Task) *TaskRunner {
return &TaskRunner{
tasks,
make(chan os.Signal, 1),
}
}
func LogErr(f func() error) func() {
return func() {
err := f()
if err != nil {
log.Print(err)
}
}
}
func (tr TaskRunner) Run() error {
c := cron.New()
for _, t := range tr.Tasks {
spec := t.GetTaskSpec()
if spec.Cron != "" {
e, err := c.AddFunc(spec.Cron, LogErr(t.Run))
if err != nil {
return breverrors.WrapAndTrace(err)
}
if spec.RunCronImmediately {
c.Entry(e).Job.Run()
}
} else {
// we do this so that the context still applies
e, err := c.AddFunc("@yearly", LogErr(t.Run))
if err != nil {
return breverrors.WrapAndTrace(err)
}
c.Entry(e).Job.Run()
c.Remove(e)
}
}
c.Start()
tr.WaitTillSignal(c.Stop)
log.Print("stopped")
return nil
}
func (tr TaskRunner) WaitTillSignal(ctxfn func() context.Context) {
signal.Notify(tr.StopSignals, syscall.SIGQUIT)
signal.Notify(tr.StopSignals, syscall.SIGTERM)
signal.Notify(tr.StopSignals, syscall.SIGHUP)
signal.Notify(tr.StopSignals, syscall.SIGINT)
defer signal.Stop(tr.StopSignals)
<-tr.StopSignals
log.Print("stopping")
<-ctxfn().Done()
}
func (tr *TaskRunner) SendStop() {
tr.StopSignals <- syscall.SIGQUIT
}