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|
package memberlist
import (
"bytes"
"io"
"net"
"strings"
"testing"
"github.com/stretchr/testify/require"
)
func TestAddLabelHeaderToPacket(t *testing.T) {
type testcase struct {
buf []byte
label string
expectPacket []byte
expectErr string
}
run := func(t *testing.T, tc testcase) {
got, err := AddLabelHeaderToPacket(tc.buf, tc.label)
if tc.expectErr != "" {
require.Error(t, err)
require.Contains(t, err.Error(), tc.expectErr)
} else {
require.NoError(t, err)
require.Equal(t, tc.expectPacket, got)
}
}
longLabel := strings.Repeat("a", 255)
cases := map[string]testcase{
"nil buf with no label": testcase{
buf: nil,
label: "",
expectPacket: nil,
},
"nil buf with label": testcase{
buf: nil,
label: "foo",
expectPacket: append([]byte{byte(hasLabelMsg), 3}, []byte("foo")...),
},
"message with label": testcase{
buf: []byte("something"),
label: "foo",
expectPacket: append([]byte{byte(hasLabelMsg), 3}, []byte("foosomething")...),
},
"message with no label": testcase{
buf: []byte("something"),
label: "",
expectPacket: []byte("something"),
},
"message with almost too long label": testcase{
buf: []byte("something"),
label: longLabel,
expectPacket: append([]byte{byte(hasLabelMsg), 255}, []byte(longLabel+"something")...),
},
"label too long by one byte": testcase{
buf: []byte("something"),
label: longLabel + "x",
expectErr: `label "` + longLabel + `x" is too long`,
},
}
for name, tc := range cases {
t.Run(name, func(t *testing.T) {
run(t, tc)
})
}
}
func TestRemoveLabelHeaderFromPacket(t *testing.T) {
type testcase struct {
buf []byte
expectLabel string
expectPacket []byte
expectErr string
}
run := func(t *testing.T, tc testcase) {
gotBuf, gotLabel, err := RemoveLabelHeaderFromPacket(tc.buf)
if tc.expectErr != "" {
require.Error(t, err)
require.Contains(t, err.Error(), tc.expectErr)
} else {
require.NoError(t, err)
require.Equal(t, tc.expectPacket, gotBuf)
require.Equal(t, tc.expectLabel, gotLabel)
}
}
cases := map[string]testcase{
"empty buf": testcase{
buf: []byte{},
expectLabel: "",
expectPacket: []byte{},
},
"ping with no label": testcase{
buf: buildBuffer(t, pingMsg, "blah"),
expectLabel: "",
expectPacket: buildBuffer(t, pingMsg, "blah"),
},
"error with no label": testcase{ // 2021-10: largest standard message type
buf: buildBuffer(t, errMsg, "blah"),
expectLabel: "",
expectPacket: buildBuffer(t, errMsg, "blah"),
},
"v1 encrypt with no label": testcase{ // 2021-10: highest encryption version
buf: buildBuffer(t, maxEncryptionVersion, "blah"),
expectLabel: "",
expectPacket: buildBuffer(t, maxEncryptionVersion, "blah"),
},
"buf too small for label": testcase{
buf: buildBuffer(t, hasLabelMsg, "x"),
expectErr: `cannot decode label; packet has been truncated`,
},
"buf too small for label size": testcase{
buf: buildBuffer(t, hasLabelMsg),
expectErr: `cannot decode label; packet has been truncated`,
},
"label empty": testcase{
buf: buildBuffer(t, hasLabelMsg, 0, "x"),
expectErr: `label header cannot be empty when present`,
},
"label truncated": testcase{
buf: buildBuffer(t, hasLabelMsg, 2, "x"),
expectErr: `cannot decode label; packet has been truncated`,
},
"ping with label": testcase{
buf: buildBuffer(t, hasLabelMsg, 3, "abc", pingMsg, "blah"),
expectLabel: "abc",
expectPacket: buildBuffer(t, pingMsg, "blah"),
},
"error with label": testcase{ // 2021-10: largest standard message type
buf: buildBuffer(t, hasLabelMsg, 3, "abc", errMsg, "blah"),
expectLabel: "abc",
expectPacket: buildBuffer(t, errMsg, "blah"),
},
"v1 encrypt with label": testcase{ // 2021-10: highest encryption version
buf: buildBuffer(t, hasLabelMsg, 3, "abc", maxEncryptionVersion, "blah"),
expectLabel: "abc",
expectPacket: buildBuffer(t, maxEncryptionVersion, "blah"),
},
}
for name, tc := range cases {
t.Run(name, func(t *testing.T) {
run(t, tc)
})
}
}
func TestAddLabelHeaderToStream(t *testing.T) {
type testcase struct {
label string
expectData []byte
expectErr string
}
suffixData := "EXTRA DATA"
run := func(t *testing.T, tc testcase) {
server, client := net.Pipe()
defer server.Close()
defer client.Close()
var (
dataCh = make(chan []byte, 1)
errCh = make(chan error, 1)
)
go func() {
var buf bytes.Buffer
_, err := io.Copy(&buf, server)
if err != nil {
errCh <- err
}
dataCh <- buf.Bytes()
}()
err := AddLabelHeaderToStream(client, tc.label)
if tc.expectErr != "" {
require.Error(t, err)
require.Contains(t, err.Error(), tc.expectErr)
return
}
require.NoError(t, err)
client.Write([]byte(suffixData))
client.Close()
expect := make([]byte, 0, len(suffixData)+len(tc.expectData))
expect = append(expect, tc.expectData...)
expect = append(expect, suffixData...)
select {
case err := <-errCh:
require.NoError(t, err)
case got := <-dataCh:
require.Equal(t, expect, got)
}
}
longLabel := strings.Repeat("a", 255)
cases := map[string]testcase{
"no label": testcase{
label: "",
expectData: nil,
},
"with label": testcase{
label: "foo",
expectData: buildBuffer(t, hasLabelMsg, 3, "foo"),
},
"almost too long label": testcase{
label: longLabel,
expectData: buildBuffer(t, hasLabelMsg, 255, longLabel),
},
"label too long by one byte": testcase{
label: longLabel + "x",
expectErr: `label "` + longLabel + `x" is too long`,
},
}
for name, tc := range cases {
t.Run(name, func(t *testing.T) {
run(t, tc)
})
}
}
func TestRemoveLabelHeaderFromStream(t *testing.T) {
type testcase struct {
buf []byte
expectLabel string
expectData []byte
expectErr string
}
run := func(t *testing.T, tc testcase) {
server, client := net.Pipe()
defer server.Close()
defer client.Close()
var (
errCh = make(chan error, 1)
)
go func() {
_, err := server.Write(tc.buf)
if err != nil {
errCh <- err
}
server.Close()
}()
newConn, gotLabel, err := RemoveLabelHeaderFromStream(client)
if tc.expectErr != "" {
require.Error(t, err)
require.Contains(t, err.Error(), tc.expectErr)
return
}
require.NoError(t, err)
gotBuf, err := io.ReadAll(newConn)
require.NoError(t, err)
require.Equal(t, tc.expectData, gotBuf)
require.Equal(t, tc.expectLabel, gotLabel)
}
cases := map[string]testcase{
"empty buf": testcase{
buf: []byte{},
expectLabel: "",
expectData: []byte{},
},
"ping with no label": testcase{
buf: buildBuffer(t, pingMsg, "blah"),
expectLabel: "",
expectData: buildBuffer(t, pingMsg, "blah"),
},
"error with no label": testcase{ // 2021-10: largest standard message type
buf: buildBuffer(t, errMsg, "blah"),
expectLabel: "",
expectData: buildBuffer(t, errMsg, "blah"),
},
"v1 encrypt with no label": testcase{ // 2021-10: highest encryption version
buf: buildBuffer(t, maxEncryptionVersion, "blah"),
expectLabel: "",
expectData: buildBuffer(t, maxEncryptionVersion, "blah"),
},
"buf too small for label": testcase{
buf: buildBuffer(t, hasLabelMsg, "x"),
expectErr: `cannot decode label; stream has been truncated`,
},
"buf too small for label size": testcase{
buf: buildBuffer(t, hasLabelMsg),
expectErr: `cannot decode label; stream has been truncated`,
},
"label empty": testcase{
buf: buildBuffer(t, hasLabelMsg, 0, "x"),
expectErr: `label header cannot be empty when present`,
},
"label truncated": testcase{
buf: buildBuffer(t, hasLabelMsg, 2, "x"),
expectErr: `cannot decode label; stream has been truncated`,
},
"ping with label": testcase{
buf: buildBuffer(t, hasLabelMsg, 3, "abc", pingMsg, "blah"),
expectLabel: "abc",
expectData: buildBuffer(t, pingMsg, "blah"),
},
"error with label": testcase{ // 2021-10: largest standard message type
buf: buildBuffer(t, hasLabelMsg, 3, "abc", errMsg, "blah"),
expectLabel: "abc",
expectData: buildBuffer(t, errMsg, "blah"),
},
"v1 encrypt with label": testcase{ // 2021-10: highest encryption version
buf: buildBuffer(t, hasLabelMsg, 3, "abc", maxEncryptionVersion, "blah"),
expectLabel: "abc",
expectData: buildBuffer(t, maxEncryptionVersion, "blah"),
},
}
for name, tc := range cases {
t.Run(name, func(t *testing.T) {
run(t, tc)
})
}
}
func buildBuffer(t *testing.T, stuff ...interface{}) []byte {
var buf bytes.Buffer
for _, item := range stuff {
switch x := item.(type) {
case int:
x2 := uint(x)
if x2 > 255 {
t.Fatalf("int is too big")
}
buf.WriteByte(byte(x2))
case byte:
buf.WriteByte(byte(x))
case messageType:
buf.WriteByte(byte(x))
case encryptionVersion:
buf.WriteByte(byte(x))
case string:
buf.Write([]byte(x))
case []byte:
buf.Write(x)
default:
t.Fatalf("unexpected type %T", item)
}
}
return buf.Bytes()
}
func TestLabelOverhead(t *testing.T) {
require.Equal(t, 0, labelOverhead(""))
require.Equal(t, 3, labelOverhead("a"))
require.Equal(t, 9, labelOverhead("abcdefg"))
}
|
