// Copyright (C) 2019 Storj Labs, Inc.
// See LICENSE for copying information.

package errs2

import (
	"context"
	"net/http"

	"github.com/zeebo/errs"
	"google.golang.org/grpc"
)

// IgnoreCanceled returns nil, when the operation was about canceling.
func IgnoreCanceled(err error) error {
	if IsFunc(err, func(err error) bool {
		return err == context.Canceled ||
			err == grpc.ErrServerStopped ||
			err == http.ErrServerClosed
	}) {
		return nil
	}

	return err
}

// IsFunc checks whether any of the underlying errors matches the func
func IsFunc(err error, is func(err error) bool) bool {
	if err == nil {
		return is(err)
	}
	for {
		if is(err) {
			return true
		}
		unwrapped := errs.Unwrap(err)
		if unwrapped == nil || unwrapped == err {
			return false
		}
		err = unwrapped
	}
}