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message_test.go
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message_test.go
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package dns
import (
"bytes"
"fmt"
"net"
"reflect"
"strings"
"testing"
"time"
"github.com/benburkert/dns/edns"
)
func TestQuestionPackUnpack(t *testing.T) {
t.Parallel()
tests := []struct {
question Question
raw []byte
}{
{
question: Question{
Name: ".",
Type: TypeA,
Class: ClassIN,
},
raw: []byte{0x0, 0x0, 0x1, 0x0, 0x1},
},
{
question: Question{
Name: "google.com.",
Type: TypeAAAA,
Class: ClassIN,
},
raw: []byte{
0x6, 'g', 'o', 'o', 'g', 'l', 'e',
0x3, 'c', 'o', 'm',
0x0,
0x0, 0x1C, 0x0, 0x1,
},
},
}
for _, test := range tests {
test := test
t.Run(string(test.question.Name), func(t *testing.T) {
t.Parallel()
raw, err := test.question.Pack(nil, nil)
if err != nil {
t.Fatal(err)
}
if want, got := test.raw, raw; !bytes.Equal(want, got) {
t.Errorf("want raw question %x, got %x", want, got)
}
q := new(Question)
buf, err := q.Unpack(raw, nil)
if err != nil {
t.Fatal(err)
}
if len(buf) > 0 {
t.Errorf("left-over data after unpack: %x", buf)
}
if want, got := test.question, *q; want != got {
t.Errorf("want question %+v, got %+v", want, got)
}
})
}
}
func TestNamePackUnpack(t *testing.T) {
t.Parallel()
tests := []struct {
name string
raw []byte
err error
}{
{".", []byte{0x0}, nil},
{"google..com", nil, errZeroSegLen},
{"google.com.", rawGoogleCom, nil},
{".google.com.", nil, errZeroSegLen},
{"www..google.com.", nil, errZeroSegLen},
{"www.google.com.", append([]byte{0x3, 'w', 'w', 'w'}, rawGoogleCom...), nil},
}
for _, test := range tests {
test := test
t.Run(test.name, func(t *testing.T) {
t.Parallel()
raw, err := compressor{}.Pack(nil, test.name)
if err != nil {
if want, got := test.err, err; want != got {
t.Errorf("want err %q, got %q", want, got)
}
return
}
if want, got := test.raw, raw; !bytes.Equal(want, got) {
t.Fatalf("want raw name %x, got %x", want, got)
}
name, buf, err := decompressor(nil).Unpack(raw)
if err != nil {
if want, got := test.err, err; want != got {
t.Fatalf("want err %q, got %q", want, got)
}
return
}
if len(buf) > 0 {
t.Errorf("left-over data after unpack: %x", buf)
}
if want, got := test.name, name; want != got {
t.Errorf("want unpacked name %q, got %q", want, got)
}
})
}
}
func TestMessagePackUnpack(t *testing.T) {
t.Parallel()
tests := []struct {
name string
msg Message
compress bool
buf []byte
raw []byte
}{
{
name: ". IN AAAA",
msg: Message{
ID: 0x1001,
RecursionDesired: true,
Questions: []Question{
{
Name: ".",
Type: TypeAAAA,
Class: ClassIN,
},
},
},
raw: []byte{
0x10, 0x01, // ID=0x1001
0x01, 0x00, // RD=1
0x00, 0x01, // QDCOUNT=1
0x00, 0x00, // ANCOUNT=0
0x00, 0x00, // NSCOUNT=0
0x00, 0x00, // ARCOUNT=0
0x00, 0x00, 0x1C, 0x00, 0x01, // . IN AAAA
},
},
{
name: "txt.example.com. IN TXT",
msg: Message{
ID: 0x01,
Response: true,
Questions: []Question{
{
Name: "txt.example.com.",
Type: TypeTXT,
Class: ClassIN,
},
},
Answers: []Resource{
{
Name: "txt.example.com.",
Class: ClassIN,
TTL: 60 * time.Second,
Record: &TXT{[]string{"multi", "segment txt", "record"}},
},
},
},
raw: []byte{
0x00, 0x01, // ID=0x0001
0x80, 0x00, // QR=1
0x00, 0x01, // QDCOUNT=1
0x00, 0x01, // ANCOUNT=1
0x00, 0x00, // NSCOUNT=0
0x00, 0x00, // ARCOUNT=0
// txt.example.com. IN TXT
0x03, 't', 'x', 't',
0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e',
0x03, 'c', 'o', 'm',
0x00,
0x00, 0x10, 0x00, 0x01, // TYPE=TXT,CLASS=IN
// txt.example.com. 60 IN TXT "abcd"
0x03, 't', 'x', 't',
0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e',
0x03, 'c', 'o', 'm',
0x00,
0x00, 0x10, 0x00, 0x01, // TYPE=TXT,CLASS=IN
0x00, 0x00, 0x00, 0x3C, // TTL=60
0x00, 0x19, // RDLENGTH=25
0x05, 'm', 'u', 'l', 't', 'i',
0x0B, 's', 'e', 'g', 'm', 'e', 'n', 't', ' ', 't', 'x', 't',
0x06, 'r', 'e', 'c', 'o', 'r', 'd',
},
},
{
name: ". 60 IN A",
msg: Message{
ID: 0x100,
Response: true,
Questions: []Question{
{
Name: ".",
Type: TypeA,
Class: ClassIN,
},
},
Answers: []Resource{
{
Name: ".",
Class: ClassIN,
TTL: 60 * time.Second,
Record: &A{
A: net.IPv4(127, 0, 0, 1).To4(),
},
},
},
},
raw: []byte{
0x01, 0x00, // ID=0x0100
0x80, 0x00, // RD=1
0x00, 0x01, // QDCOUNT=1
0x00, 0x01, // ANCOUNT=1
0x00, 0x00, // NSCOUNT=0
0x00, 0x00, // ARCOUNT=0
0x00, 0x00, 0x01, 0x00, 0x01, // . IN A
// . 60 IN 127.0.0.1
0x00,
0x00, 0x01, 0x00, 0x01, // TYPE=A,CLASS=IN
0x00, 0x00, 0x00, 0x3C, // TTL=60
0x00, 0x04,
0x7F, 0x00, 0x00, 0x01, // 127.0.0.1
},
},
{
name: ". 60 IN AAAA",
msg: Message{
ID: 0x101,
Response: true,
Questions: []Question{
{
Name: ".",
Type: TypeAAAA,
Class: ClassIN,
},
},
Answers: []Resource{
{
Name: ".",
Class: ClassIN,
TTL: 60 * time.Second,
Record: &AAAA{
AAAA: net.ParseIP("::1"),
},
},
},
},
raw: []byte{
0x01, 0x01, // ID=0x0101
0x80, 0x00, // RD=1
0x00, 0x01, // QDCOUNT=1
0x00, 0x01, // ANCOUNT=1
0x00, 0x00, // NSCOUNT=0
0x00, 0x00, // ARCOUNT=0
0x00, 0x00, 0x1C, 0x00, 0x01, // . IN AAAA
// . 60 IN ::1
0x00,
0x00, 0x1C, 0x00, 0x01, // TYPE=AAAA,CLASS=IN
0x00, 0x00, 0x00, 0x3C, // TTL=60
0x00, 0x10,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, // ::1
},
},
{
name: ". 60 IN CNAME",
msg: Message{
ID: 0x102,
Response: true,
Questions: []Question{
{
Name: ".",
Type: TypeCNAME,
Class: ClassIN,
},
},
Answers: []Resource{
{
Name: ".",
Class: ClassIN,
TTL: 60 * time.Second,
Record: &CNAME{
CNAME: "tld.",
},
},
},
},
raw: []byte{
0x01, 0x02, // ID=0x0102
0x80, 0x00, // RD=1
0x00, 0x01, // QDCOUNT=1
0x00, 0x01, // ANCOUNT=1
0x00, 0x00, // NSCOUNT=0
0x00, 0x00, // ARCOUNT=0
0x00, 0x00, 0x05, 0x00, 0x01, // . IN CNAME
// . 60 IN "tld."
0x00,
0x00, 0x05, 0x00, 0x01, // TYPE=CNAME,CLASS=IN
0x00, 0x00, 0x00, 0x3C, // TTL=60
0x00, 0x05,
0x03, 't', 'l', 'd',
0x00,
},
},
{
name: ". 60 IN SOA",
msg: Message{
ID: 0x103,
Response: true,
Questions: []Question{
{
Name: ".",
Type: TypeA,
Class: ClassIN,
},
},
Authorities: []Resource{
{
Name: ".",
Class: ClassIN,
TTL: 60 * time.Second,
Record: &SOA{
NS: "ns.",
MBox: "mx.",
Serial: 1234,
Refresh: 24 * time.Hour,
Retry: 2 * time.Hour,
Expire: 3 * time.Minute,
MinTTL: 4 * time.Second,
},
},
},
},
raw: []byte{
0x01, 0x03, // ID=0x0103
0x80, 0x00, // RD=1
0x00, 0x01, // QDCOUNT=1
0x00, 0x00, // ANCOUNT=0
0x00, 0x01, // NSCOUNT=1
0x00, 0x00, // ARCOUNT=0
0x00, 0x00, 0x01, 0x00, 0x01, // . IN A
// . 60 IN ns. mx. 1234 86400 7200 180 4
0x00,
0x00, 0x06, 0x00, 0x01, // TYPE=SOA,CLASS=IN
0x00, 0x00, 0x00, 0x3C, // TTL=60
0x00, 0x1C,
0x02, 'n', 's',
0x00,
0x02, 'm', 'x',
0x00,
0x00, 0x00, 0x04, 0xD2, // SERIAL=1234
0x00, 0x01, 0x51, 0x80, // REFRESH=86400
0x00, 0x00, 0x1C, 0x20, // RETRY=720
0x00, 0x00, 0x00, 0xB4, // EXPIRE=180
0x00, 0x00, 0x00, 0x04, // MINIMUM=4
},
},
{
name: "1.0.0.127.in-addr.arpa. 60 IN PTR",
msg: Message{
ID: 0x104,
Response: true,
Questions: []Question{
{
Name: "1.0.0.127.in-addr.arpa.",
Type: TypePTR,
Class: ClassIN,
},
},
Answers: []Resource{
{
Name: "1.0.0.127.in-addr.arpa.",
Class: ClassIN,
TTL: 60 * time.Second,
Record: &PTR{
PTR: "localhost.",
},
},
},
},
raw: []byte{
0x01, 0x04, // ID=0x0104
0x80, 0x00, // RD=1
0x00, 0x01, // QDCOUNT=1
0x00, 0x01, // ANCOUNT=1
0x00, 0x00, // NSCOUNT=0
0x00, 0x00, // ARCOUNT=0
0x01, '1',
0x01, '0',
0x01, '0',
0x03, '1', '2', '7',
0x07, 'i', 'n', '-', 'a', 'd', 'd', 'r',
0x04, 'a', 'r', 'p', 'a',
0x00,
0x00, 0x0C, 0x00, 0x01, // TYPE=PTR,CLASS=IN
// 1.0.0.127.in-addr.arpa. 60 IN localhost.
0x01, '1',
0x01, '0',
0x01, '0',
0x03, '1', '2', '7',
0x07, 'i', 'n', '-', 'a', 'd', 'd', 'r',
0x04, 'a', 'r', 'p', 'a',
0x00,
0x00, 0x0C, 0x00, 0x01, // TYPE=PTR,CLASS=IN
0x00, 0x00, 0x00, 0x3C, // TTL=60
0x00, 0x0B,
0x09, 'l', 'o', 'c', 'a', 'l', 'h', 'o', 's', 't',
0x00,
},
},
{
name: ". 60 IN MX",
msg: Message{
ID: 0x105,
Response: true,
Questions: []Question{
{
Name: ".",
Type: TypeMX,
Class: ClassIN,
},
},
Answers: []Resource{
{
Name: ".",
Class: ClassIN,
TTL: 60 * time.Second,
Record: &MX{
Pref: 101,
MX: "mx.",
},
},
},
},
raw: []byte{
0x01, 0x05, // ID=0x0105
0x80, 0x00, // RD=1
0x00, 0x01, // QDCOUNT=1
0x00, 0x01, // ANCOUNT=1
0x00, 0x00, // NSCOUNT=0
0x00, 0x00, // ARCOUNT=0
0x00, 0x00, 0x0F, 0x00, 0x01, // . IN MX
0x00, 0x00, 0x0F, 0x00, 0x01, // TYPE=MX,CLASS=IN
0x00, 0x00, 0x00, 0x3C, // TTL=60
0x00, 0x06,
0x00, 0x65,
0x02, 'm', 'x',
0x00,
},
},
{
name: ". 60 IN NS",
msg: Message{
ID: 0x106,
Response: true,
Questions: []Question{
{
Name: ".",
Type: TypeNS,
Class: ClassIN,
},
},
Answers: []Resource{
{
Name: ".",
Class: ClassIN,
TTL: 60 * time.Second,
Record: &NS{
NS: "ns.",
},
},
},
},
raw: []byte{
0x01, 0x06, // ID=0x0106
0x80, 0x00, // RD=1
0x00, 0x01, // QDCOUNT=1
0x00, 0x01, // ANCOUNT=1
0x00, 0x00, // NSCOUNT=0
0x00, 0x00, // ARCOUNT=0
0x00, 0x00, 0x02, 0x00, 0x01, // . IN NS
0x00, 0x00, 0x02, 0x00, 0x01, // TYPE=NS,CLASS=IN
0x00, 0x00, 0x00, 0x3C, // TTL=60
0x00, 0x04,
0x02, 'n', 's',
0x00,
},
},
{
name: ". 60 IN SRV",
msg: Message{
ID: 0x107,
Response: true,
Questions: []Question{
{
Name: ".",
Type: TypeSRV,
Class: ClassIN,
},
},
Answers: []Resource{
{
Name: ".",
Class: ClassIN,
TTL: 60 * time.Second,
Record: &SRV{
Priority: 0x01,
Weight: 0x10,
Port: 0x11,
Target: "srv.",
},
},
},
},
raw: []byte{
0x01, 0x07, // ID=0x0107
0x80, 0x00, // RD=1
0x00, 0x01, // QDCOUNT=1
0x00, 0x01, // ANCOUNT=1
0x00, 0x00, // NSCOUNT=0
0x00, 0x00, // ARCOUNT=0
0x00, 0x00, 0x21, 0x00, 0x01, // . IN SRV
0x00, 0x00, 0x21, 0x00, 0x01, // TYPE=SRV,CLASS=IN
0x00, 0x00, 0x00, 0x3C, // TTL=60
0x00, 0x0B,
0x00, 0x01, 0x00, 0x10, 0x00, 0x11,
0x03, 's', 'r', 'v',
0x00,
},
},
{
name: ". 60 IN DNAME",
msg: Message{
ID: 0x108,
Response: true,
Questions: []Question{
{
Name: "dname.",
Type: TypeA,
Class: ClassIN,
},
},
Answers: []Resource{
{
Name: ".",
Class: ClassIN,
TTL: 60 * time.Second,
Record: &DNAME{
DNAME: "example.com.",
},
},
{
Name: "dname.example.com.",
Class: ClassIN,
TTL: 60 * time.Second,
Record: &A{
A: net.IPv4(127, 0, 0, 1).To4(),
},
},
},
},
raw: []byte{
0x01, 0x08, // ID=0x0108
0x80, 0x00, // RD=1
0x00, 0x01, // QDCOUNT=1
0x00, 0x02, // ANCOUNT=2
0x00, 0x00, // NSCOUNT=0
0x00, 0x00, // ARCOUNT=0
// dname. IN A
0x05, 'd', 'n', 'a', 'm', 'e',
0x00,
0x00, 0x01, 0x00, 0x01, // TYPE=A,CLASS=IN
// example.com. IN DNAME
0x00,
0x00, 0x27, 0x00, 0x01, // TYPE=DNAME,CLASS=IN
0x00, 0x00, 0x00, 0x3C, // TTL=60
0x00, 0x0D,
0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e',
0x03, 'c', 'o', 'm',
0x00,
// dname.example.com. IN A
0x05, 'd', 'n', 'a', 'm', 'e',
0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e',
0x03, 'c', 'o', 'm',
0x00,
0x00, 0x01, 0x00, 0x01, // TYPE=A,CLASS=IN
0x00, 0x00, 0x00, 0x3C, // TTL=60
0x00, 0x04,
0x7F, 0x00, 0x00, 0x01, // 127.0.0.1
},
},
{
name: ". 60 IN CAA",
msg: Message{
ID: 0x109,
Response: true,
Questions: []Question{
{
Name: ".",
Type: TypeCAA,
Class: ClassIN,
},
},
Answers: []Resource{
{
Name: ".",
Class: ClassIN,
TTL: 60 * time.Second,
Record: &CAA{
Tag: "issue",
Value: "pki.example.com",
},
},
},
},
raw: []byte{
0x01, 0x09, // ID=0x0109
0x80, 0x00, // RD=1
0x00, 0x01, // QDCOUNT=1
0x00, 0x01, // ANCOUNT=1
0x00, 0x00, // NSCOUNT=0
0x00, 0x00, // ARCOUNT=0
0x00, 0x01, 0x01, 0x00, 0x01, // . IN CAA
// . 60 IN issue "pki.example.com"
0x00,
0x01, 0x01, 0x00, 0x01, // TYPE=CAA,CLASS=IN
0x00, 0x00, 0x00, 0x3C, // TTL=60
0x00, 0x16,
0x00, 0x05,
'i', 's', 's', 'u', 'e',
'p', 'k', 'i', '.', 'e', 'x', 'a', 'm', 'p', 'l', 'e', '.', 'c', 'o', 'm',
},
},
{
name: "compressed response",
msg: Message{
Response: true,
Answers: []Resource{
{
Name: "example.com.",
Class: ClassIN,
TTL: 60 * time.Second,
Record: &A{
A: net.IPv4(127, 0, 0, 1).To4(),
},
},
},
Questions: []Question{
{
Name: "example.com.",
Type: TypeA,
Class: ClassIN,
},
},
},
compress: true,
buf: make([]byte, 2),
raw: []byte{
0x00, 0x00, // ID=0x0001
0x80, 0x00, // QR=1
0x00, 0x01, // QDCOUNT=1
0x00, 0x01, // ANCOUNT=1
0x00, 0x00, // NSCOUNT=0
0x00, 0x00, // ARCOUNT=0
// example.com. IN A
0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e',
0x03, 'c', 'o', 'm',
0x00,
0x00, 0x01, 0x00, 0x01, // TYPE=A,CLASS=IN
// example.com 60 IN A 127.0.0.1
0xC0, 0x0C,
0x00, 0x01, 0x00, 0x01, // TYPE=TXT,CLASS=IN
0x00, 0x00, 0x00, 0x3C, // TTL=60
0x00, 0x04, // RDLENGTH=5
0x7F, 0x00, 0x00, 0x01, // 127.0.0.1
},
},
{
name: ". IN AAAA + OPT",
msg: Message{
ID: 0x1001,
RecursionDesired: true,
Questions: []Question{
{
Name: ".",
Type: TypeAAAA,
Class: ClassIN,
},
},
Additionals: []Resource{
{
Name: ".",
Class: 1280,
TTL: 0,
Record: &OPT{
Options: []edns.Option{
edns.Option{
Code: edns.OptionCodeCookie,
Data: []byte{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07},
},
},
},
},
},
},
raw: []byte{
0x10, 0x01, // ID=0x1001
0x01, 0x00, // RD=1
0x00, 0x01, // QDCOUNT=1
0x00, 0x00, // ANCOUNT=0
0x00, 0x00, // NSCOUNT=0
0x00, 0x01, // ARCOUNT=1
0x00, 0x00, 0x1C, 0x00, 0x01, // . IN AAAA
0x00, 0x00, 0x29, // . OPT ...
0x05, 0x00, // CLASS=1280 (UDP MTU)
0x00, 0x00, 0x00, 0x00, // ex-rcode+flags
0x00, 0x0C, // RDLENGTH=12
0x00, 0x0A, // OPTION-CODE = 10
0x00, 0x08, // OPTION-LENGTH = 8
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, // Client Cookie (fixed size, 8 bytes)
},
},
}
for _, test := range tests {
test := test
t.Run(string(test.name), func(t *testing.T) {
t.Parallel()
raw, err := test.msg.Pack(test.buf, test.compress)
if err != nil {
t.Fatal(err)
}
if want, got := append(test.buf, test.raw...), raw; !bytes.Equal(want, got) {
t.Errorf("want raw message %+v, got %+v", want, got)
}
msg := new(Message)
buf, err := msg.Unpack(raw[len(test.buf):])
if err != nil {
t.Fatal(err)
}
if len(buf) > 0 {
t.Errorf("left-over data after unpack: %x", buf)
}
if want, got := test.msg, *msg; !reflect.DeepEqual(want, got) {
t.Errorf("want message %+v, got %+v", want, got)
}
})
}
}
func TestMessageCompress(t *testing.T) {
t.Parallel()
tests := []struct {
name string
msg Message
raw []byte
}{
{
name: "multi-A-question",
msg: Message{
Questions: []Question{
{
Name: "aaa.",
Type: TypeA,
Class: ClassIN,
},
{
Name: "bbb.aaa.",
Type: TypeA,
Class: ClassIN,
},
{
Name: "ccc.bbb.aaa.",
Type: TypeA,
Class: ClassIN,
},
},
},
raw: []byte{
0x00, 0x00, // ID=0x0000
0x00, 0x00, // QR=0
0x00, 0x03, // QDCOUNT=0
0x00, 0x00, // ANCOUNT=0
0x00, 0x00, // NSCOUNT=0
0x00, 0x00, // ARCOUNT=0
// aaa. IN A
0x03, 'a', 'a', 'a',
0x00,
0x00, 0x01, 0x00, 0x01,
// bbb.aaa. IN A
0x03, 'b', 'b', 'b',
0xC0, 0x0C,
0x00, 0x01, 0x00, 0x01,
// ccc.bbb.aaa. IN A
0x03, 'c', 'c', 'c',
0xC0, 0x15,
0x00, 0x01, 0x00, 0x01,
},
},
}
for _, test := range tests {
test := test
t.Run(string(test.name), func(t *testing.T) {
t.Parallel()
raw, err := test.msg.Pack(nil, true)
if err != nil {
t.Fatal(err)
}
if want, got := test.raw, raw; !bytes.Equal(want, got) {
t.Errorf("want raw message %+v, got %+v", want, got)
}
msg := new(Message)
buf, err := msg.Unpack(raw)
if err != nil {
t.Fatal(err)
}
if len(buf) > 0 {
t.Errorf("left-over data after unpack: %x", buf)
}
if want, got := test.msg, *msg; !reflect.DeepEqual(want, got) {
t.Errorf("want message %+v, got %+v", want, got)
}
})
}
}
var (
rawGoogleCom = []byte{
0x6, 'g', 'o', 'o', 'g', 'l', 'e',
0x3, 'c', 'o', 'm',
0x0,
}
)
func BenchmarkMessagePack(b *testing.B) {
b.Run("small-message", func(b *testing.B) {
msg := smallTestMsg()
for _, bufsize := range []int{0, 512} {
bufsize := bufsize
b.Run(fmt.Sprintf("buf=%d", bufsize), func(b *testing.B) {
benchamarkMessagePack(b, msg, make([]byte, bufsize))
})
}
})
b.Run("large-message", func(b *testing.B) {
msg := largeTestMsg()
for _, bufsize := range []int{0, 512, 4096} {
bufsize := bufsize
b.Run(fmt.Sprintf("buf=%d", bufsize), func(b *testing.B) {
benchamarkMessagePack(b, msg, make([]byte, bufsize))
})
}
})
}
func benchamarkMessagePack(b *testing.B, msg Message, buf []byte) {
tmp, err := msg.Pack(nil, false)
if err != nil {
b.Fatal(err)
}
b.SetBytes(int64(len(tmp)))
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
if _, err := msg.Pack(buf[:0], false); err != nil {
b.Fatal(err)
}
}
}
func BenchmarkMessageCompress(b *testing.B) {
b.Run("small-message", func(b *testing.B) {
msg := smallTestMsg()
for _, bufsize := range []int{0, 512} {
bufsize := bufsize
b.Run(fmt.Sprintf("buf=%d", bufsize), func(b *testing.B) {
benchamarkMessageCompress(b, msg, make([]byte, bufsize))
})