syncthing/vendor/github.com/gogo/protobuf/proto/text_test.go
Jakob Borg 916ec63af6 cmd/stdiscosrv: New discovery server (fixes #4618)
This is a new revision of the discovery server. Relevant changes and
non-changes:

- Protocol towards clients is unchanged.

- Recommended large scale design is still to be deployed nehind nginx (I
  tested, and it's still a lot faster at terminating TLS).

- Database backend is leveldb again, only. It scales enough, is easy to
  setup, and we don't need any backend to take care of.

- Server supports replication. This is a simple TCP channel - protect it
  with a firewall when deploying over the internet. (We deploy this within
  the same datacenter, and with firewall.) Any incoming client announces
  are sent over the replication channel(s) to other peer discosrvs.
  Incoming replication changes are applied to the database as if they came
  from clients, but without the TLS/certificate overhead.

- Metrics are exposed using the prometheus library, when enabled.

- The database values and replication protocol is protobuf, because JSON
  was quite CPU intensive when I tried that and benchmarked it.

- The "Retry-After" value for failed lookups gets slowly increased from
  a default of 120 seconds, by 5 seconds for each failed lookup,
  independently by each discosrv. This lowers the query load over time for
  clients that are never seen. The Retry-After maxes out at 3600 after a
  couple of weeks of this increase. The number of failed lookups is
  stored in the database, now and then (avoiding making each lookup a
  database put).

All in all this means clients can be pointed towards a cluster using
just multiple A / AAAA records to gain both load sharing and redundancy
(if one is down, clients will talk to the remaining ones).

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/4648
2018-01-14 08:52:31 +00:00

475 lines
12 KiB
Go

// Go support for Protocol Buffers - Google's data interchange format
//
// Copyright 2010 The Go Authors. All rights reserved.
// https://github.com/golang/protobuf
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
package proto_test
import (
"bytes"
"errors"
"io/ioutil"
"math"
"strings"
"testing"
"github.com/gogo/protobuf/proto"
proto3pb "github.com/gogo/protobuf/proto/proto3_proto"
pb "github.com/gogo/protobuf/proto/testdata"
)
// textMessage implements the methods that allow it to marshal and unmarshal
// itself as text.
type textMessage struct {
}
func (*textMessage) MarshalText() ([]byte, error) {
return []byte("custom"), nil
}
func (*textMessage) UnmarshalText(bytes []byte) error {
if string(bytes) != "custom" {
return errors.New("expected 'custom'")
}
return nil
}
func (*textMessage) Reset() {}
func (*textMessage) String() string { return "" }
func (*textMessage) ProtoMessage() {}
func newTestMessage() *pb.MyMessage {
msg := &pb.MyMessage{
Count: proto.Int32(42),
Name: proto.String("Dave"),
Quote: proto.String(`"I didn't want to go."`),
Pet: []string{"bunny", "kitty", "horsey"},
Inner: &pb.InnerMessage{
Host: proto.String("footrest.syd"),
Port: proto.Int32(7001),
Connected: proto.Bool(true),
},
Others: []*pb.OtherMessage{
{
Key: proto.Int64(0xdeadbeef),
Value: []byte{1, 65, 7, 12},
},
{
Weight: proto.Float32(6.022),
Inner: &pb.InnerMessage{
Host: proto.String("lesha.mtv"),
Port: proto.Int32(8002),
},
},
},
Bikeshed: pb.MyMessage_BLUE.Enum(),
Somegroup: &pb.MyMessage_SomeGroup{
GroupField: proto.Int32(8),
},
// One normally wouldn't do this.
// This is an undeclared tag 13, as a varint (wire type 0) with value 4.
XXX_unrecognized: []byte{13<<3 | 0, 4},
}
ext := &pb.Ext{
Data: proto.String("Big gobs for big rats"),
}
if err := proto.SetExtension(msg, pb.E_Ext_More, ext); err != nil {
panic(err)
}
greetings := []string{"adg", "easy", "cow"}
if err := proto.SetExtension(msg, pb.E_Greeting, greetings); err != nil {
panic(err)
}
// Add an unknown extension. We marshal a pb.Ext, and fake the ID.
b, err := proto.Marshal(&pb.Ext{Data: proto.String("3G skiing")})
if err != nil {
panic(err)
}
b = append(proto.EncodeVarint(201<<3|proto.WireBytes), b...)
proto.SetRawExtension(msg, 201, b)
// Extensions can be plain fields, too, so let's test that.
b = append(proto.EncodeVarint(202<<3|proto.WireVarint), 19)
proto.SetRawExtension(msg, 202, b)
return msg
}
const text = `count: 42
name: "Dave"
quote: "\"I didn't want to go.\""
pet: "bunny"
pet: "kitty"
pet: "horsey"
inner: <
host: "footrest.syd"
port: 7001
connected: true
>
others: <
key: 3735928559
value: "\001A\007\014"
>
others: <
weight: 6.022
inner: <
host: "lesha.mtv"
port: 8002
>
>
bikeshed: BLUE
SomeGroup {
group_field: 8
}
/* 2 unknown bytes */
13: 4
[testdata.Ext.more]: <
data: "Big gobs for big rats"
>
[testdata.greeting]: "adg"
[testdata.greeting]: "easy"
[testdata.greeting]: "cow"
/* 13 unknown bytes */
201: "\t3G skiing"
/* 3 unknown bytes */
202: 19
`
func TestMarshalText(t *testing.T) {
buf := new(bytes.Buffer)
if err := proto.MarshalText(buf, newTestMessage()); err != nil {
t.Fatalf("proto.MarshalText: %v", err)
}
s := buf.String()
if s != text {
t.Errorf("Got:\n===\n%v===\nExpected:\n===\n%v===\n", s, text)
}
}
func TestMarshalTextCustomMessage(t *testing.T) {
buf := new(bytes.Buffer)
if err := proto.MarshalText(buf, &textMessage{}); err != nil {
t.Fatalf("proto.MarshalText: %v", err)
}
s := buf.String()
if s != "custom" {
t.Errorf("Got %q, expected %q", s, "custom")
}
}
func TestMarshalTextNil(t *testing.T) {
want := "<nil>"
tests := []proto.Message{nil, (*pb.MyMessage)(nil)}
for i, test := range tests {
buf := new(bytes.Buffer)
if err := proto.MarshalText(buf, test); err != nil {
t.Fatal(err)
}
if got := buf.String(); got != want {
t.Errorf("%d: got %q want %q", i, got, want)
}
}
}
func TestMarshalTextUnknownEnum(t *testing.T) {
// The Color enum only specifies values 0-2.
m := &pb.MyMessage{Bikeshed: pb.MyMessage_Color(3).Enum()}
got := m.String()
const want = `bikeshed:3 `
if got != want {
t.Errorf("\n got %q\nwant %q", got, want)
}
}
func TestTextOneof(t *testing.T) {
tests := []struct {
m proto.Message
want string
}{
// zero message
{&pb.Communique{}, ``},
// scalar field
{&pb.Communique{Union: &pb.Communique_Number{Number: 4}}, `number:4`},
// message field
{&pb.Communique{Union: &pb.Communique_Msg{
Msg: &pb.Strings{StringField: proto.String("why hello!")},
}}, `msg:<string_field:"why hello!" >`},
// bad oneof (should not panic)
{&pb.Communique{Union: &pb.Communique_Msg{Msg: nil}}, `msg:/* nil */`},
}
for _, test := range tests {
got := strings.TrimSpace(test.m.String())
if got != test.want {
t.Errorf("\n got %s\nwant %s", got, test.want)
}
}
}
func BenchmarkMarshalTextBuffered(b *testing.B) {
buf := new(bytes.Buffer)
m := newTestMessage()
for i := 0; i < b.N; i++ {
buf.Reset()
proto.MarshalText(buf, m)
}
}
func BenchmarkMarshalTextUnbuffered(b *testing.B) {
w := ioutil.Discard
m := newTestMessage()
for i := 0; i < b.N; i++ {
proto.MarshalText(w, m)
}
}
func compact(src string) string {
// s/[ \n]+/ /g; s/ $//;
dst := make([]byte, len(src))
space, comment := false, false
j := 0
for i := 0; i < len(src); i++ {
if strings.HasPrefix(src[i:], "/*") {
comment = true
i++
continue
}
if comment && strings.HasPrefix(src[i:], "*/") {
comment = false
i++
continue
}
if comment {
continue
}
c := src[i]
if c == ' ' || c == '\n' {
space = true
continue
}
if j > 0 && (dst[j-1] == ':' || dst[j-1] == '<' || dst[j-1] == '{') {
space = false
}
if c == '{' {
space = false
}
if space {
dst[j] = ' '
j++
space = false
}
dst[j] = c
j++
}
if space {
dst[j] = ' '
j++
}
return string(dst[0:j])
}
var compactText = compact(text)
func TestCompactText(t *testing.T) {
s := proto.CompactTextString(newTestMessage())
if s != compactText {
t.Errorf("Got:\n===\n%v===\nExpected:\n===\n%v\n===\n", s, compactText)
}
}
func TestStringEscaping(t *testing.T) {
testCases := []struct {
in *pb.Strings
out string
}{
{
// Test data from C++ test (TextFormatTest.StringEscape).
// Single divergence: we don't escape apostrophes.
&pb.Strings{StringField: proto.String("\"A string with ' characters \n and \r newlines and \t tabs and \001 slashes \\ and multiple spaces")},
"string_field: \"\\\"A string with ' characters \\n and \\r newlines and \\t tabs and \\001 slashes \\\\ and multiple spaces\"\n",
},
{
// Test data from the same C++ test.
&pb.Strings{StringField: proto.String("\350\260\267\346\255\214")},
"string_field: \"\\350\\260\\267\\346\\255\\214\"\n",
},
{
// Some UTF-8.
&pb.Strings{StringField: proto.String("\x00\x01\xff\x81")},
`string_field: "\000\001\377\201"` + "\n",
},
}
for i, tc := range testCases {
var buf bytes.Buffer
if err := proto.MarshalText(&buf, tc.in); err != nil {
t.Errorf("proto.MarsalText: %v", err)
continue
}
s := buf.String()
if s != tc.out {
t.Errorf("#%d: Got:\n%s\nExpected:\n%s\n", i, s, tc.out)
continue
}
// Check round-trip.
pbStrings := new(pb.Strings)
if err := proto.UnmarshalText(s, pbStrings); err != nil {
t.Errorf("#%d: UnmarshalText: %v", i, err)
continue
}
if !proto.Equal(pbStrings, tc.in) {
t.Errorf("#%d: Round-trip failed:\nstart: %v\n end: %v", i, tc.in, pbStrings)
}
}
}
// A limitedWriter accepts some output before it fails.
// This is a proxy for something like a nearly-full or imminently-failing disk,
// or a network connection that is about to die.
type limitedWriter struct {
b bytes.Buffer
limit int
}
var outOfSpace = errors.New("proto: insufficient space")
func (w *limitedWriter) Write(p []byte) (n int, err error) {
var avail = w.limit - w.b.Len()
if avail <= 0 {
return 0, outOfSpace
}
if len(p) <= avail {
return w.b.Write(p)
}
n, _ = w.b.Write(p[:avail])
return n, outOfSpace
}
func TestMarshalTextFailing(t *testing.T) {
// Try lots of different sizes to exercise more error code-paths.
for lim := 0; lim < len(text); lim++ {
buf := new(limitedWriter)
buf.limit = lim
err := proto.MarshalText(buf, newTestMessage())
// We expect a certain error, but also some partial results in the buffer.
if err != outOfSpace {
t.Errorf("Got:\n===\n%v===\nExpected:\n===\n%v===\n", err, outOfSpace)
}
s := buf.b.String()
x := text[:buf.limit]
if s != x {
t.Errorf("Got:\n===\n%v===\nExpected:\n===\n%v===\n", s, x)
}
}
}
func TestFloats(t *testing.T) {
tests := []struct {
f float64
want string
}{
{0, "0"},
{4.7, "4.7"},
{math.Inf(1), "inf"},
{math.Inf(-1), "-inf"},
{math.NaN(), "nan"},
}
for _, test := range tests {
msg := &pb.FloatingPoint{F: &test.f}
got := strings.TrimSpace(msg.String())
want := `f:` + test.want
if got != want {
t.Errorf("f=%f: got %q, want %q", test.f, got, want)
}
}
}
func TestRepeatedNilText(t *testing.T) {
m := &pb.MessageList{
Message: []*pb.MessageList_Message{
nil,
{
Name: proto.String("Horse"),
},
nil,
},
}
want := `Message <nil>
Message {
name: "Horse"
}
Message <nil>
`
if s := proto.MarshalTextString(m); s != want {
t.Errorf(" got: %s\nwant: %s", s, want)
}
}
func TestProto3Text(t *testing.T) {
tests := []struct {
m proto.Message
want string
}{
// zero message
{&proto3pb.Message{}, ``},
// zero message except for an empty byte slice
{&proto3pb.Message{Data: []byte{}}, ``},
// trivial case
{&proto3pb.Message{Name: "Rob", HeightInCm: 175}, `name:"Rob" height_in_cm:175`},
// empty map
{&pb.MessageWithMap{}, ``},
// non-empty map; map format is the same as a repeated struct,
// and they are sorted by key (numerically for numeric keys).
{
&pb.MessageWithMap{NameMapping: map[int32]string{
-1: "Negatory",
7: "Lucky",
1234: "Feist",
6345789: "Otis",
}},
`name_mapping:<key:-1 value:"Negatory" > ` +
`name_mapping:<key:7 value:"Lucky" > ` +
`name_mapping:<key:1234 value:"Feist" > ` +
`name_mapping:<key:6345789 value:"Otis" >`,
},
// map with nil value; not well-defined, but we shouldn't crash
{
&pb.MessageWithMap{MsgMapping: map[int64]*pb.FloatingPoint{7: nil}},
`msg_mapping:<key:7 >`,
},
}
for _, test := range tests {
got := strings.TrimSpace(test.m.String())
if got != test.want {
t.Errorf("\n got %s\nwant %s", got, test.want)
}
}
}