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background.go
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background.go
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package background
import (
"context"
"fmt"
"runtime/debug"
"sync"
"github.com/sirupsen/logrus"
)
// Background is a container of concurrently executed tasks.
// It handles tasks's errors by logging them.
// It also recovers in case of panics.
type Background struct {
wg sync.WaitGroup
log logrus.FieldLogger
}
// New constructs and returns a new Background.
func New(log logrus.FieldLogger) *Background {
return &Background{
log: log,
}
}
// Add inserts a new task, which will be executed in background.
func (bg *Background) Add(f func() error) {
bg.wg.Add(1)
go func() {
defer bg.wg.Done()
defer func() {
if rec := recover(); rec != nil {
trace := debug.Stack()
err := fmt.Errorf("PANIC [%v] TRACE[%s]", rec, string(trace))
bg.log.WithField("message", err).Error("PANIC")
}
}()
if err := f(); err != nil {
bg.log.WithField("message", err).Error("ERROR")
}
}()
}
// Shutdown waits for tasks to complete. If the passed context
// expires then it returns an error indicating that some task
// didn't terminate in time.
func (bg *Background) Shutdown(ctx context.Context) error {
quit := make(chan struct{})
go func() {
bg.wg.Wait()
quit <- struct{}{}
}()
select {
case <-ctx.Done():
return ctx.Err()
case <-quit:
return nil
}
}