104 lines
2.5 KiB
Go
104 lines
2.5 KiB
Go
// Copyright 2018 Google LLC. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package expr_test
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import (
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"bytes"
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"fmt"
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"strings"
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"testing"
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"github.com/mdlayher/netlink"
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"github.com/mdlayher/netlink/nltest"
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)
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// nfdump returns a hexdump of 4 bytes per line (like nft --debug=all), allowing
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// users to make sense of large byte literals more easily.
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func nfdump(b []byte) string {
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var buf bytes.Buffer
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i := 0
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for ; i < len(b); i += 4 {
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// TODO: show printable characters as ASCII
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fmt.Fprintf(&buf, "%02x %02x %02x %02x\n",
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b[i],
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b[i+1],
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b[i+2],
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b[i+3])
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}
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for ; i < len(b); i++ {
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fmt.Fprintf(&buf, "%02x ", b[i])
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}
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return buf.String()
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}
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// linediff returns a side-by-side diff of two nfdump() return values, flagging
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// lines which are not equal with an exclamation point prefix.
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func linediff(a, b string) string {
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var buf bytes.Buffer
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fmt.Fprintf(&buf, "got -- want\n")
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linesA := strings.Split(a, "\n")
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linesB := strings.Split(b, "\n")
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for idx, lineA := range linesA {
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if idx >= len(linesB) {
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break
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}
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lineB := linesB[idx]
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prefix := "! "
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if lineA == lineB {
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prefix = " "
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}
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fmt.Fprintf(&buf, "%s%s -- %s\n", prefix, lineA, lineB)
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}
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return buf.String()
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}
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func ifname(n string) []byte {
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b := make([]byte, 16)
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copy(b, []byte(n+"\x00"))
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return b
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}
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func CheckNLReq(t *testing.T, wantMsg [][]byte, replies [][]netlink.Message) nltest.Func {
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return func(req []netlink.Message) ([]netlink.Message, error) {
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for idx, msg := range req {
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b, err := msg.MarshalBinary()
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if err != nil {
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return req, err
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}
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if len(b) < 16 {
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continue
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}
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b = b[16:]
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if len(wantMsg) == 0 {
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t.Errorf("no want entry for message %d: %x", idx, b)
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continue
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}
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if got, want := b, wantMsg[0]; !bytes.Equal(got, want) {
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t.Errorf("message %d: %s", idx, linediff(nfdump(got), nfdump(want)))
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}
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wantMsg = wantMsg[1:]
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}
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if len(replies) > 0 {
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rep := replies[0]
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replies = replies[1:]
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return rep, nil
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} else {
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return req, nil
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}
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}
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}
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