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747 |
jeremybenn |
// Copyright 20011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// This file contains tests of the GobEncoder/GobDecoder support.
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package gob
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import (
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"bytes"
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"errors"
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"fmt"
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"io"
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"strings"
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"testing"
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"time"
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)
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// Types that implement the GobEncoder/Decoder interfaces.
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type ByteStruct struct {
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a byte // not an exported field
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}
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type StringStruct struct {
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s string // not an exported field
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}
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type ArrayStruct struct {
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a [8192]byte // not an exported field
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}
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type Gobber int
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type ValueGobber string // encodes with a value, decodes with a pointer.
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// The relevant methods
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func (g *ByteStruct) GobEncode() ([]byte, error) {
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b := make([]byte, 3)
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b[0] = g.a
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b[1] = g.a + 1
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b[2] = g.a + 2
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return b, nil
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}
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func (g *ByteStruct) GobDecode(data []byte) error {
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if g == nil {
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return errors.New("NIL RECEIVER")
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}
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// Expect N sequential-valued bytes.
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if len(data) == 0 {
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return io.EOF
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}
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g.a = data[0]
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for i, c := range data {
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if c != g.a+byte(i) {
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return errors.New("invalid data sequence")
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}
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}
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return nil
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}
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func (g *StringStruct) GobEncode() ([]byte, error) {
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return []byte(g.s), nil
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}
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func (g *StringStruct) GobDecode(data []byte) error {
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// Expect N sequential-valued bytes.
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if len(data) == 0 {
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return io.EOF
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}
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a := data[0]
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for i, c := range data {
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if c != a+byte(i) {
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return errors.New("invalid data sequence")
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}
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}
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g.s = string(data)
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return nil
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}
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func (a *ArrayStruct) GobEncode() ([]byte, error) {
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return a.a[:], nil
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}
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func (a *ArrayStruct) GobDecode(data []byte) error {
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if len(data) != len(a.a) {
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return errors.New("wrong length in array decode")
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}
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copy(a.a[:], data)
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return nil
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}
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func (g *Gobber) GobEncode() ([]byte, error) {
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return []byte(fmt.Sprintf("VALUE=%d", *g)), nil
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}
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func (g *Gobber) GobDecode(data []byte) error {
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_, err := fmt.Sscanf(string(data), "VALUE=%d", (*int)(g))
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return err
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}
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func (v ValueGobber) GobEncode() ([]byte, error) {
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return []byte(fmt.Sprintf("VALUE=%s", v)), nil
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}
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func (v *ValueGobber) GobDecode(data []byte) error {
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_, err := fmt.Sscanf(string(data), "VALUE=%s", (*string)(v))
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return err
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}
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// Structs that include GobEncodable fields.
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type GobTest0 struct {
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X int // guarantee we have something in common with GobTest*
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G *ByteStruct
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}
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type GobTest1 struct {
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X int // guarantee we have something in common with GobTest*
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G *StringStruct
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}
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type GobTest2 struct {
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X int // guarantee we have something in common with GobTest*
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G string // not a GobEncoder - should give us errors
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}
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type GobTest3 struct {
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X int // guarantee we have something in common with GobTest*
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G *Gobber
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}
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type GobTest4 struct {
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X int // guarantee we have something in common with GobTest*
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V ValueGobber
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}
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type GobTest5 struct {
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X int // guarantee we have something in common with GobTest*
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V *ValueGobber
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}
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type GobTestIgnoreEncoder struct {
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X int // guarantee we have something in common with GobTest*
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}
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type GobTestValueEncDec struct {
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X int // guarantee we have something in common with GobTest*
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G StringStruct // not a pointer.
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}
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type GobTestIndirectEncDec struct {
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X int // guarantee we have something in common with GobTest*
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G ***StringStruct // indirections to the receiver.
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}
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type GobTestArrayEncDec struct {
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X int // guarantee we have something in common with GobTest*
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A ArrayStruct // not a pointer.
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}
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type GobTestIndirectArrayEncDec struct {
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X int // guarantee we have something in common with GobTest*
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A ***ArrayStruct // indirections to a large receiver.
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}
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func TestGobEncoderField(t *testing.T) {
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b := new(bytes.Buffer)
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// First a field that's a structure.
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enc := NewEncoder(b)
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err := enc.Encode(GobTest0{17, &ByteStruct{'A'}})
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if err != nil {
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t.Fatal("encode error:", err)
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}
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dec := NewDecoder(b)
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x := new(GobTest0)
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err = dec.Decode(x)
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if err != nil {
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t.Fatal("decode error:", err)
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}
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if x.G.a != 'A' {
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t.Errorf("expected 'A' got %c", x.G.a)
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}
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// Now a field that's not a structure.
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b.Reset()
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gobber := Gobber(23)
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err = enc.Encode(GobTest3{17, &gobber})
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if err != nil {
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t.Fatal("encode error:", err)
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}
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y := new(GobTest3)
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err = dec.Decode(y)
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if err != nil {
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t.Fatal("decode error:", err)
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}
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if *y.G != 23 {
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t.Errorf("expected '23 got %d", *y.G)
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}
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}
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// Even though the field is a value, we can still take its address
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// and should be able to call the methods.
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func TestGobEncoderValueField(t *testing.T) {
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b := new(bytes.Buffer)
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// First a field that's a structure.
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enc := NewEncoder(b)
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err := enc.Encode(GobTestValueEncDec{17, StringStruct{"HIJKL"}})
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if err != nil {
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t.Fatal("encode error:", err)
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}
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dec := NewDecoder(b)
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x := new(GobTestValueEncDec)
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err = dec.Decode(x)
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if err != nil {
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t.Fatal("decode error:", err)
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}
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if x.G.s != "HIJKL" {
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t.Errorf("expected `HIJKL` got %s", x.G.s)
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}
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}
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// GobEncode/Decode should work even if the value is
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// more indirect than the receiver.
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func TestGobEncoderIndirectField(t *testing.T) {
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b := new(bytes.Buffer)
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// First a field that's a structure.
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enc := NewEncoder(b)
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s := &StringStruct{"HIJKL"}
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sp := &s
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err := enc.Encode(GobTestIndirectEncDec{17, &sp})
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if err != nil {
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t.Fatal("encode error:", err)
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}
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dec := NewDecoder(b)
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x := new(GobTestIndirectEncDec)
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err = dec.Decode(x)
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if err != nil {
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t.Fatal("decode error:", err)
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}
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if (***x.G).s != "HIJKL" {
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t.Errorf("expected `HIJKL` got %s", (***x.G).s)
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}
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}
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// Test with a large field with methods.
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func TestGobEncoderArrayField(t *testing.T) {
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b := new(bytes.Buffer)
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enc := NewEncoder(b)
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var a GobTestArrayEncDec
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a.X = 17
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for i := range a.A.a {
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a.A.a[i] = byte(i)
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}
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err := enc.Encode(a)
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if err != nil {
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t.Fatal("encode error:", err)
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}
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dec := NewDecoder(b)
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x := new(GobTestArrayEncDec)
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err = dec.Decode(x)
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if err != nil {
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t.Fatal("decode error:", err)
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}
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for i, v := range x.A.a {
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if v != byte(i) {
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t.Errorf("expected %x got %x", byte(i), v)
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break
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}
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}
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}
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// Test an indirection to a large field with methods.
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func TestGobEncoderIndirectArrayField(t *testing.T) {
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b := new(bytes.Buffer)
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enc := NewEncoder(b)
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var a GobTestIndirectArrayEncDec
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a.X = 17
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var array ArrayStruct
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ap := &array
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app := &ap
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a.A = &app
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for i := range array.a {
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array.a[i] = byte(i)
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}
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err := enc.Encode(a)
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if err != nil {
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t.Fatal("encode error:", err)
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}
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dec := NewDecoder(b)
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x := new(GobTestIndirectArrayEncDec)
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err = dec.Decode(x)
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if err != nil {
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t.Fatal("decode error:", err)
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}
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for i, v := range (***x.A).a {
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if v != byte(i) {
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t.Errorf("expected %x got %x", byte(i), v)
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break
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}
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}
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}
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// As long as the fields have the same name and implement the
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// interface, we can cross-connect them. Not sure it's useful
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// and may even be bad but it works and it's hard to prevent
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// without exposing the contents of the object, which would
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// defeat the purpose.
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func TestGobEncoderFieldsOfDifferentType(t *testing.T) {
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// first, string in field to byte in field
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b := new(bytes.Buffer)
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enc := NewEncoder(b)
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err := enc.Encode(GobTest1{17, &StringStruct{"ABC"}})
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if err != nil {
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t.Fatal("encode error:", err)
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}
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dec := NewDecoder(b)
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x := new(GobTest0)
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err = dec.Decode(x)
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if err != nil {
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t.Fatal("decode error:", err)
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}
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if x.G.a != 'A' {
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t.Errorf("expected 'A' got %c", x.G.a)
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}
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// now the other direction, byte in field to string in field
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b.Reset()
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err = enc.Encode(GobTest0{17, &ByteStruct{'X'}})
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if err != nil {
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t.Fatal("encode error:", err)
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}
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y := new(GobTest1)
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err = dec.Decode(y)
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if err != nil {
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t.Fatal("decode error:", err)
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}
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if y.G.s != "XYZ" {
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t.Fatalf("expected `XYZ` got %c", y.G.s)
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}
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}
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| 342 |
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// Test that we can encode a value and decode into a pointer.
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func TestGobEncoderValueEncoder(t *testing.T) {
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| 345 |
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// first, string in field to byte in field
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b := new(bytes.Buffer)
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enc := NewEncoder(b)
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err := enc.Encode(GobTest4{17, ValueGobber("hello")})
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| 349 |
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if err != nil {
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t.Fatal("encode error:", err)
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}
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dec := NewDecoder(b)
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x := new(GobTest5)
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err = dec.Decode(x)
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if err != nil {
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t.Fatal("decode error:", err)
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}
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| 358 |
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if *x.V != "hello" {
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t.Errorf("expected `hello` got %s", x.V)
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}
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}
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|
|
func TestGobEncoderFieldTypeError(t *testing.T) {
|
| 364 |
|
|
// GobEncoder to non-decoder: error
|
| 365 |
|
|
b := new(bytes.Buffer)
|
| 366 |
|
|
enc := NewEncoder(b)
|
| 367 |
|
|
err := enc.Encode(GobTest1{17, &StringStruct{"ABC"}})
|
| 368 |
|
|
if err != nil {
|
| 369 |
|
|
t.Fatal("encode error:", err)
|
| 370 |
|
|
}
|
| 371 |
|
|
dec := NewDecoder(b)
|
| 372 |
|
|
x := &GobTest2{}
|
| 373 |
|
|
err = dec.Decode(x)
|
| 374 |
|
|
if err == nil {
|
| 375 |
|
|
t.Fatal("expected decode error for mismatched fields (encoder to non-decoder)")
|
| 376 |
|
|
}
|
| 377 |
|
|
if strings.Index(err.Error(), "type") < 0 {
|
| 378 |
|
|
t.Fatal("expected type error; got", err)
|
| 379 |
|
|
}
|
| 380 |
|
|
// Non-encoder to GobDecoder: error
|
| 381 |
|
|
b.Reset()
|
| 382 |
|
|
err = enc.Encode(GobTest2{17, "ABC"})
|
| 383 |
|
|
if err != nil {
|
| 384 |
|
|
t.Fatal("encode error:", err)
|
| 385 |
|
|
}
|
| 386 |
|
|
y := &GobTest1{}
|
| 387 |
|
|
err = dec.Decode(y)
|
| 388 |
|
|
if err == nil {
|
| 389 |
|
|
t.Fatal("expected decode error for mismatched fields (non-encoder to decoder)")
|
| 390 |
|
|
}
|
| 391 |
|
|
if strings.Index(err.Error(), "type") < 0 {
|
| 392 |
|
|
t.Fatal("expected type error; got", err)
|
| 393 |
|
|
}
|
| 394 |
|
|
}
|
| 395 |
|
|
|
| 396 |
|
|
// Even though ByteStruct is a struct, it's treated as a singleton at the top level.
|
| 397 |
|
|
func TestGobEncoderStructSingleton(t *testing.T) {
|
| 398 |
|
|
b := new(bytes.Buffer)
|
| 399 |
|
|
enc := NewEncoder(b)
|
| 400 |
|
|
err := enc.Encode(&ByteStruct{'A'})
|
| 401 |
|
|
if err != nil {
|
| 402 |
|
|
t.Fatal("encode error:", err)
|
| 403 |
|
|
}
|
| 404 |
|
|
dec := NewDecoder(b)
|
| 405 |
|
|
x := new(ByteStruct)
|
| 406 |
|
|
err = dec.Decode(x)
|
| 407 |
|
|
if err != nil {
|
| 408 |
|
|
t.Fatal("decode error:", err)
|
| 409 |
|
|
}
|
| 410 |
|
|
if x.a != 'A' {
|
| 411 |
|
|
t.Errorf("expected 'A' got %c", x.a)
|
| 412 |
|
|
}
|
| 413 |
|
|
}
|
| 414 |
|
|
|
| 415 |
|
|
func TestGobEncoderNonStructSingleton(t *testing.T) {
|
| 416 |
|
|
b := new(bytes.Buffer)
|
| 417 |
|
|
enc := NewEncoder(b)
|
| 418 |
|
|
err := enc.Encode(Gobber(1234))
|
| 419 |
|
|
if err != nil {
|
| 420 |
|
|
t.Fatal("encode error:", err)
|
| 421 |
|
|
}
|
| 422 |
|
|
dec := NewDecoder(b)
|
| 423 |
|
|
var x Gobber
|
| 424 |
|
|
err = dec.Decode(&x)
|
| 425 |
|
|
if err != nil {
|
| 426 |
|
|
t.Fatal("decode error:", err)
|
| 427 |
|
|
}
|
| 428 |
|
|
if x != 1234 {
|
| 429 |
|
|
t.Errorf("expected 1234 got %d", x)
|
| 430 |
|
|
}
|
| 431 |
|
|
}
|
| 432 |
|
|
|
| 433 |
|
|
func TestGobEncoderIgnoreStructField(t *testing.T) {
|
| 434 |
|
|
b := new(bytes.Buffer)
|
| 435 |
|
|
// First a field that's a structure.
|
| 436 |
|
|
enc := NewEncoder(b)
|
| 437 |
|
|
err := enc.Encode(GobTest0{17, &ByteStruct{'A'}})
|
| 438 |
|
|
if err != nil {
|
| 439 |
|
|
t.Fatal("encode error:", err)
|
| 440 |
|
|
}
|
| 441 |
|
|
dec := NewDecoder(b)
|
| 442 |
|
|
x := new(GobTestIgnoreEncoder)
|
| 443 |
|
|
err = dec.Decode(x)
|
| 444 |
|
|
if err != nil {
|
| 445 |
|
|
t.Fatal("decode error:", err)
|
| 446 |
|
|
}
|
| 447 |
|
|
if x.X != 17 {
|
| 448 |
|
|
t.Errorf("expected 17 got %c", x.X)
|
| 449 |
|
|
}
|
| 450 |
|
|
}
|
| 451 |
|
|
|
| 452 |
|
|
func TestGobEncoderIgnoreNonStructField(t *testing.T) {
|
| 453 |
|
|
b := new(bytes.Buffer)
|
| 454 |
|
|
// First a field that's a structure.
|
| 455 |
|
|
enc := NewEncoder(b)
|
| 456 |
|
|
gobber := Gobber(23)
|
| 457 |
|
|
err := enc.Encode(GobTest3{17, &gobber})
|
| 458 |
|
|
if err != nil {
|
| 459 |
|
|
t.Fatal("encode error:", err)
|
| 460 |
|
|
}
|
| 461 |
|
|
dec := NewDecoder(b)
|
| 462 |
|
|
x := new(GobTestIgnoreEncoder)
|
| 463 |
|
|
err = dec.Decode(x)
|
| 464 |
|
|
if err != nil {
|
| 465 |
|
|
t.Fatal("decode error:", err)
|
| 466 |
|
|
}
|
| 467 |
|
|
if x.X != 17 {
|
| 468 |
|
|
t.Errorf("expected 17 got %c", x.X)
|
| 469 |
|
|
}
|
| 470 |
|
|
}
|
| 471 |
|
|
|
| 472 |
|
|
func TestGobEncoderIgnoreNilEncoder(t *testing.T) {
|
| 473 |
|
|
b := new(bytes.Buffer)
|
| 474 |
|
|
// First a field that's a structure.
|
| 475 |
|
|
enc := NewEncoder(b)
|
| 476 |
|
|
err := enc.Encode(GobTest0{X: 18}) // G is nil
|
| 477 |
|
|
if err != nil {
|
| 478 |
|
|
t.Fatal("encode error:", err)
|
| 479 |
|
|
}
|
| 480 |
|
|
dec := NewDecoder(b)
|
| 481 |
|
|
x := new(GobTest0)
|
| 482 |
|
|
err = dec.Decode(x)
|
| 483 |
|
|
if err != nil {
|
| 484 |
|
|
t.Fatal("decode error:", err)
|
| 485 |
|
|
}
|
| 486 |
|
|
if x.X != 18 {
|
| 487 |
|
|
t.Errorf("expected x.X = 18, got %v", x.X)
|
| 488 |
|
|
}
|
| 489 |
|
|
if x.G != nil {
|
| 490 |
|
|
t.Errorf("expected x.G = nil, got %v", x.G)
|
| 491 |
|
|
}
|
| 492 |
|
|
}
|
| 493 |
|
|
|
| 494 |
|
|
type gobDecoderBug0 struct {
|
| 495 |
|
|
foo, bar string
|
| 496 |
|
|
}
|
| 497 |
|
|
|
| 498 |
|
|
func (br *gobDecoderBug0) String() string {
|
| 499 |
|
|
return br.foo + "-" + br.bar
|
| 500 |
|
|
}
|
| 501 |
|
|
|
| 502 |
|
|
func (br *gobDecoderBug0) GobEncode() ([]byte, error) {
|
| 503 |
|
|
return []byte(br.String()), nil
|
| 504 |
|
|
}
|
| 505 |
|
|
|
| 506 |
|
|
func (br *gobDecoderBug0) GobDecode(b []byte) error {
|
| 507 |
|
|
br.foo = "foo"
|
| 508 |
|
|
br.bar = "bar"
|
| 509 |
|
|
return nil
|
| 510 |
|
|
}
|
| 511 |
|
|
|
| 512 |
|
|
// This was a bug: the receiver has a different indirection level
|
| 513 |
|
|
// than the variable.
|
| 514 |
|
|
func TestGobEncoderExtraIndirect(t *testing.T) {
|
| 515 |
|
|
gdb := &gobDecoderBug0{"foo", "bar"}
|
| 516 |
|
|
buf := new(bytes.Buffer)
|
| 517 |
|
|
e := NewEncoder(buf)
|
| 518 |
|
|
if err := e.Encode(gdb); err != nil {
|
| 519 |
|
|
t.Fatalf("encode: %v", err)
|
| 520 |
|
|
}
|
| 521 |
|
|
d := NewDecoder(buf)
|
| 522 |
|
|
var got *gobDecoderBug0
|
| 523 |
|
|
if err := d.Decode(&got); err != nil {
|
| 524 |
|
|
t.Fatalf("decode: %v", err)
|
| 525 |
|
|
}
|
| 526 |
|
|
if got.foo != gdb.foo || got.bar != gdb.bar {
|
| 527 |
|
|
t.Errorf("got = %q, want %q", got, gdb)
|
| 528 |
|
|
}
|
| 529 |
|
|
}
|
| 530 |
|
|
|
| 531 |
|
|
// Another bug: this caused a crash with the new Go1 Time type.
|
| 532 |
|
|
// We throw in a gob-encoding array, to test another case of isZero
|
| 533 |
|
|
|
| 534 |
|
|
type isZeroBug struct {
|
| 535 |
|
|
T time.Time
|
| 536 |
|
|
S string
|
| 537 |
|
|
I int
|
| 538 |
|
|
A isZeroBugArray
|
| 539 |
|
|
}
|
| 540 |
|
|
|
| 541 |
|
|
type isZeroBugArray [2]uint8
|
| 542 |
|
|
|
| 543 |
|
|
// Receiver is value, not pointer, to test isZero of array.
|
| 544 |
|
|
func (a isZeroBugArray) GobEncode() (b []byte, e error) {
|
| 545 |
|
|
b = append(b, a[:]...)
|
| 546 |
|
|
return b, nil
|
| 547 |
|
|
}
|
| 548 |
|
|
|
| 549 |
|
|
func (a *isZeroBugArray) GobDecode(data []byte) error {
|
| 550 |
|
|
if len(data) != len(a) {
|
| 551 |
|
|
return io.EOF
|
| 552 |
|
|
}
|
| 553 |
|
|
a[0] = data[0]
|
| 554 |
|
|
a[1] = data[1]
|
| 555 |
|
|
return nil
|
| 556 |
|
|
}
|
| 557 |
|
|
|
| 558 |
|
|
func TestGobEncodeIsZero(t *testing.T) {
|
| 559 |
|
|
x := isZeroBug{time.Now(), "hello", -55, isZeroBugArray{1, 2}}
|
| 560 |
|
|
b := new(bytes.Buffer)
|
| 561 |
|
|
enc := NewEncoder(b)
|
| 562 |
|
|
err := enc.Encode(x)
|
| 563 |
|
|
if err != nil {
|
| 564 |
|
|
t.Fatal("encode:", err)
|
| 565 |
|
|
}
|
| 566 |
|
|
var y isZeroBug
|
| 567 |
|
|
dec := NewDecoder(b)
|
| 568 |
|
|
err = dec.Decode(&y)
|
| 569 |
|
|
if err != nil {
|
| 570 |
|
|
t.Fatal("decode:", err)
|
| 571 |
|
|
}
|
| 572 |
|
|
if x != y {
|
| 573 |
|
|
t.Fatalf("%v != %v", x, y)
|
| 574 |
|
|
}
|
| 575 |
|
|
}
|
