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runner.go
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runner.go
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package lockrunner
import (
"context"
"os"
"time"
"code.cloudfoundry.org/clock"
"code.cloudfoundry.org/lager"
"code.cloudfoundry.org/lager/lagerctx"
"github.com/concourse/atc/db/lock"
"github.com/tedsuo/ifrit"
)
//go:generate counterfeiter . Task
type Task interface {
Run(context.Context) error
}
func NewRunner(
logger lager.Logger,
task Task,
taskName string,
lockFactory lock.LockFactory,
clock clock.Clock,
interval time.Duration,
) ifrit.Runner {
return ifrit.RunFunc(func(signals <-chan os.Signal, ready chan<- struct{}) error {
close(ready)
ticker := clock.NewTicker(interval)
defer ticker.Stop()
for {
select {
case <-ticker.C():
lockLogger := logger.Session("tick")
lock, acquired, err := lockFactory.Acquire(lockLogger, lock.NewTaskLockID(taskName))
if err != nil {
break
}
if !acquired {
break
}
ctx := lagerctx.NewContext(context.Background(), lockLogger)
err = task.Run(ctx)
if err != nil {
lockLogger.Error("failed-to-run-task", err, lager.Data{"task-name": taskName})
}
err = lock.Release()
if err != nil {
lockLogger.Error("failed-to-release", err)
break
}
case <-signals:
return nil
}
}
})
}