restic/internal/repository/worker_group.go

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package repository
import (
"context"
"golang.org/x/sync/errgroup"
)
// RunWorkers runs count instances of workerFunc using an errgroup.Group.
// After all workers have terminated, finalFunc is run. If an error occurs in
// one of the workers, it is returned. FinalFunc is always run, regardless of
// any other previous errors.
func RunWorkers(ctx context.Context, count int, workerFunc, finalFunc func() error) error {
wg, ctx := errgroup.WithContext(ctx)
// run workers
for i := 0; i < count; i++ {
wg.Go(workerFunc)
}
// wait for termination
err := wg.Wait()
// make sure finalFunc is run
finalErr := finalFunc()
// if the workers returned an error, return it to the caller (disregarding
// any error from finalFunc)
if err != nil {
return err
}
// if not, return the value finalFunc returned
return finalErr
}