739 lines
17 KiB
Go
739 lines
17 KiB
Go
// Copyright 2009 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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package gob
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import (
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"bytes"
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"fmt"
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"io"
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"reflect"
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"strings"
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"testing"
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)
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type ET2 struct {
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X string
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}
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type ET1 struct {
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A int
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Et2 *ET2
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Next *ET1
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}
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// Like ET1 but with a different name for a field
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type ET3 struct {
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A int
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Et2 *ET2
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DifferentNext *ET1
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}
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// Like ET1 but with a different type for a field
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type ET4 struct {
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A int
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Et2 float64
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Next int
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}
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func TestEncoderDecoder(t *testing.T) {
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b := new(bytes.Buffer)
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enc := NewEncoder(b)
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et1 := new(ET1)
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et1.A = 7
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et1.Et2 = new(ET2)
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err := enc.Encode(et1)
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if err != nil {
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t.Error("encoder fail:", err)
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}
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dec := NewDecoder(b)
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newEt1 := new(ET1)
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err = dec.Decode(newEt1)
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if err != nil {
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t.Fatal("error decoding ET1:", err)
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}
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if !reflect.DeepEqual(et1, newEt1) {
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t.Fatalf("invalid data for et1: expected %+v; got %+v", *et1, *newEt1)
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}
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if b.Len() != 0 {
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t.Error("not at eof;", b.Len(), "bytes left")
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}
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enc.Encode(et1)
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newEt1 = new(ET1)
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err = dec.Decode(newEt1)
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if err != nil {
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t.Fatal("round 2: error decoding ET1:", err)
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}
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if !reflect.DeepEqual(et1, newEt1) {
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t.Fatalf("round 2: invalid data for et1: expected %+v; got %+v", *et1, *newEt1)
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}
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if b.Len() != 0 {
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t.Error("round 2: not at eof;", b.Len(), "bytes left")
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}
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// Now test with a running encoder/decoder pair that we recognize a type mismatch.
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err = enc.Encode(et1)
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if err != nil {
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t.Error("round 3: encoder fail:", err)
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}
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newEt2 := new(ET2)
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err = dec.Decode(newEt2)
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if err == nil {
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t.Fatal("round 3: expected `bad type' error decoding ET2")
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}
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}
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// Run one value through the encoder/decoder, but use the wrong type.
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// Input is always an ET1; we compare it to whatever is under 'e'.
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func badTypeCheck(e interface{}, shouldFail bool, msg string, t *testing.T) {
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b := new(bytes.Buffer)
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enc := NewEncoder(b)
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et1 := new(ET1)
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et1.A = 7
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et1.Et2 = new(ET2)
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err := enc.Encode(et1)
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if err != nil {
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t.Error("encoder fail:", err)
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}
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dec := NewDecoder(b)
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err = dec.Decode(e)
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if shouldFail && err == nil {
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t.Error("expected error for", msg)
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}
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if !shouldFail && err != nil {
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t.Error("unexpected error for", msg, err)
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}
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}
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// Test that we recognize a bad type the first time.
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func TestWrongTypeDecoder(t *testing.T) {
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badTypeCheck(new(ET2), true, "no fields in common", t)
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badTypeCheck(new(ET3), false, "different name of field", t)
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badTypeCheck(new(ET4), true, "different type of field", t)
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}
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func corruptDataCheck(s string, err error, t *testing.T) {
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b := bytes.NewBufferString(s)
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dec := NewDecoder(b)
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err1 := dec.Decode(new(ET2))
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if err1 != err {
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t.Errorf("from %q expected error %s; got %s", s, err, err1)
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}
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}
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// Check that we survive bad data.
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func TestBadData(t *testing.T) {
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corruptDataCheck("", io.EOF, t)
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corruptDataCheck("\x7Fhi", io.ErrUnexpectedEOF, t)
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corruptDataCheck("\x03now is the time for all good men", errBadType, t)
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}
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// Types not supported by the Encoder.
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var unsupportedValues = []interface{}{
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make(chan int),
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func(a int) bool { return true },
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}
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func TestUnsupported(t *testing.T) {
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var b bytes.Buffer
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enc := NewEncoder(&b)
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for _, v := range unsupportedValues {
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err := enc.Encode(v)
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if err == nil {
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t.Errorf("expected error for %T; got none", v)
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}
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}
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}
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func encAndDec(in, out interface{}) error {
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b := new(bytes.Buffer)
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enc := NewEncoder(b)
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err := enc.Encode(in)
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if err != nil {
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return err
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}
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dec := NewDecoder(b)
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err = dec.Decode(out)
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if err != nil {
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return err
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}
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return nil
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}
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func TestTypeToPtrType(t *testing.T) {
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// Encode a T, decode a *T
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type Type0 struct {
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A int
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}
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t0 := Type0{7}
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t0p := new(Type0)
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if err := encAndDec(t0, t0p); err != nil {
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t.Error(err)
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}
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}
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func TestPtrTypeToType(t *testing.T) {
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// Encode a *T, decode a T
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type Type1 struct {
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A uint
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}
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t1p := &Type1{17}
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var t1 Type1
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if err := encAndDec(t1, t1p); err != nil {
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t.Error(err)
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}
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}
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func TestTypeToPtrPtrPtrPtrType(t *testing.T) {
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type Type2 struct {
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A ****float64
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}
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t2 := Type2{}
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t2.A = new(***float64)
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*t2.A = new(**float64)
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**t2.A = new(*float64)
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***t2.A = new(float64)
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****t2.A = 27.4
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t2pppp := new(***Type2)
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if err := encAndDec(t2, t2pppp); err != nil {
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t.Fatal(err)
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}
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if ****(****t2pppp).A != ****t2.A {
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t.Errorf("wrong value after decode: %g not %g", ****(****t2pppp).A, ****t2.A)
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}
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}
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func TestSlice(t *testing.T) {
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type Type3 struct {
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A []string
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}
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t3p := &Type3{[]string{"hello", "world"}}
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var t3 Type3
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if err := encAndDec(t3, t3p); err != nil {
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t.Error(err)
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}
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}
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func TestValueError(t *testing.T) {
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// Encode a *T, decode a T
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type Type4 struct {
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A int
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}
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t4p := &Type4{3}
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var t4 Type4 // note: not a pointer.
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if err := encAndDec(t4p, t4); err == nil || strings.Index(err.Error(), "pointer") < 0 {
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t.Error("expected error about pointer; got", err)
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}
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}
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func TestArray(t *testing.T) {
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type Type5 struct {
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A [3]string
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B [3]byte
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}
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type Type6 struct {
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A [2]string // can't hold t5.a
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}
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t5 := Type5{[3]string{"hello", ",", "world"}, [3]byte{1, 2, 3}}
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var t5p Type5
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if err := encAndDec(t5, &t5p); err != nil {
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t.Error(err)
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}
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var t6 Type6
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if err := encAndDec(t5, &t6); err == nil {
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t.Error("should fail with mismatched array sizes")
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}
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}
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func TestRecursiveMapType(t *testing.T) {
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type recursiveMap map[string]recursiveMap
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r1 := recursiveMap{"A": recursiveMap{"B": nil, "C": nil}, "D": nil}
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r2 := make(recursiveMap)
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if err := encAndDec(r1, &r2); err != nil {
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t.Error(err)
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}
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}
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func TestRecursiveSliceType(t *testing.T) {
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type recursiveSlice []recursiveSlice
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r1 := recursiveSlice{0: recursiveSlice{0: nil}, 1: nil}
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r2 := make(recursiveSlice, 0)
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if err := encAndDec(r1, &r2); err != nil {
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t.Error(err)
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}
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}
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// Regression test for bug: must send zero values inside arrays
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func TestDefaultsInArray(t *testing.T) {
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type Type7 struct {
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B []bool
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I []int
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S []string
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F []float64
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}
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t7 := Type7{
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[]bool{false, false, true},
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[]int{0, 0, 1},
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[]string{"hi", "", "there"},
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[]float64{0, 0, 1},
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}
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var t7p Type7
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if err := encAndDec(t7, &t7p); err != nil {
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t.Error(err)
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}
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}
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var testInt int
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var testFloat32 float32
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var testString string
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var testSlice []string
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var testMap map[string]int
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var testArray [7]int
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type SingleTest struct {
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in interface{}
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out interface{}
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err string
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}
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var singleTests = []SingleTest{
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{17, &testInt, ""},
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{float32(17.5), &testFloat32, ""},
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{"bike shed", &testString, ""},
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{[]string{"bike", "shed", "paint", "color"}, &testSlice, ""},
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{map[string]int{"seven": 7, "twelve": 12}, &testMap, ""},
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{[7]int{4, 55, 0, 0, 0, 0, 0}, &testArray, ""}, // case that once triggered a bug
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{[7]int{4, 55, 1, 44, 22, 66, 1234}, &testArray, ""},
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// Decode errors
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{172, &testFloat32, "type"},
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}
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func TestSingletons(t *testing.T) {
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b := new(bytes.Buffer)
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enc := NewEncoder(b)
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dec := NewDecoder(b)
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for _, test := range singleTests {
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b.Reset()
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err := enc.Encode(test.in)
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if err != nil {
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t.Errorf("error encoding %v: %s", test.in, err)
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continue
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}
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err = dec.Decode(test.out)
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switch {
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case err != nil && test.err == "":
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t.Errorf("error decoding %v: %s", test.in, err)
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continue
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case err == nil && test.err != "":
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t.Errorf("expected error decoding %v: %s", test.in, test.err)
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continue
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case err != nil && test.err != "":
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if strings.Index(err.Error(), test.err) < 0 {
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t.Errorf("wrong error decoding %v: wanted %s, got %v", test.in, test.err, err)
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}
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continue
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}
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// Get rid of the pointer in the rhs
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val := reflect.ValueOf(test.out).Elem().Interface()
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if !reflect.DeepEqual(test.in, val) {
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t.Errorf("decoding singleton: expected %v got %v", test.in, val)
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}
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}
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}
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func TestStructNonStruct(t *testing.T) {
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type Struct struct {
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A string
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}
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type NonStruct string
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s := Struct{"hello"}
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var sp Struct
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if err := encAndDec(s, &sp); err != nil {
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t.Error(err)
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}
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var ns NonStruct
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if err := encAndDec(s, &ns); err == nil {
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t.Error("should get error for struct/non-struct")
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} else if strings.Index(err.Error(), "type") < 0 {
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t.Error("for struct/non-struct expected type error; got", err)
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}
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// Now try the other way
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var nsp NonStruct
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if err := encAndDec(ns, &nsp); err != nil {
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t.Error(err)
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}
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if err := encAndDec(ns, &s); err == nil {
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t.Error("should get error for non-struct/struct")
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} else if strings.Index(err.Error(), "type") < 0 {
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t.Error("for non-struct/struct expected type error; got", err)
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}
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}
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type interfaceIndirectTestI interface {
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F() bool
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}
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type interfaceIndirectTestT struct{}
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func (this *interfaceIndirectTestT) F() bool {
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return true
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}
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// A version of a bug reported on golang-nuts. Also tests top-level
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// slice of interfaces. The issue was registering *T caused T to be
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// stored as the concrete type.
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func TestInterfaceIndirect(t *testing.T) {
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Register(&interfaceIndirectTestT{})
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b := new(bytes.Buffer)
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w := []interfaceIndirectTestI{&interfaceIndirectTestT{}}
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err := NewEncoder(b).Encode(w)
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if err != nil {
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t.Fatal("encode error:", err)
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}
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var r []interfaceIndirectTestI
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err = NewDecoder(b).Decode(&r)
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if err != nil {
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t.Fatal("decode error:", err)
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}
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}
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// Now follow various tests that decode into things that can't represent the
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// encoded value, all of which should be legal.
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// Also, when the ignored object contains an interface value, it may define
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// types. Make sure that skipping the value still defines the types by using
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// the encoder/decoder pair to send a value afterwards. If an interface
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// is sent, its type in the test is always NewType0, so this checks that the
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// encoder and decoder don't skew with respect to type definitions.
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type Struct0 struct {
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I interface{}
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}
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type NewType0 struct {
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S string
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}
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type ignoreTest struct {
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in, out interface{}
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}
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var ignoreTests = []ignoreTest{
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// Decode normal struct into an empty struct
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{&struct{ A int }{23}, &struct{}{}},
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// Decode normal struct into a nil.
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{&struct{ A int }{23}, nil},
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// Decode singleton string into a nil.
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{"hello, world", nil},
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// Decode singleton slice into a nil.
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{[]int{1, 2, 3, 4}, nil},
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// Decode struct containing an interface into a nil.
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{&Struct0{&NewType0{"value0"}}, nil},
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// Decode singleton slice of interfaces into a nil.
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{[]interface{}{"hi", &NewType0{"value1"}, 23}, nil},
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}
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func TestDecodeIntoNothing(t *testing.T) {
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Register(new(NewType0))
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for i, test := range ignoreTests {
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b := new(bytes.Buffer)
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enc := NewEncoder(b)
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err := enc.Encode(test.in)
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if err != nil {
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t.Errorf("%d: encode error %s:", i, err)
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continue
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}
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dec := NewDecoder(b)
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err = dec.Decode(test.out)
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if err != nil {
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t.Errorf("%d: decode error: %s", i, err)
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continue
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}
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// Now see if the encoder and decoder are in a consistent state.
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str := fmt.Sprintf("Value %d", i)
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err = enc.Encode(&NewType0{str})
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if err != nil {
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t.Fatalf("%d: NewType0 encode error: %s", i, err)
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}
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ns := new(NewType0)
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err = dec.Decode(ns)
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if err != nil {
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t.Fatalf("%d: NewType0 decode error: %s", i, err)
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}
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if ns.S != str {
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t.Fatalf("%d: expected %q got %q", i, str, ns.S)
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}
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}
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}
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// Another bug from golang-nuts, involving nested interfaces.
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type Bug0Outer struct {
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Bug0Field interface{}
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}
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type Bug0Inner struct {
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A int
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}
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func TestNestedInterfaces(t *testing.T) {
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var buf bytes.Buffer
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e := NewEncoder(&buf)
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d := NewDecoder(&buf)
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Register(new(Bug0Outer))
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Register(new(Bug0Inner))
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f := &Bug0Outer{&Bug0Outer{&Bug0Inner{7}}}
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var v interface{} = f
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err := e.Encode(&v)
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if err != nil {
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t.Fatal("Encode:", err)
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}
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err = d.Decode(&v)
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if err != nil {
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t.Fatal("Decode:", err)
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}
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// Make sure it decoded correctly.
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outer1, ok := v.(*Bug0Outer)
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if !ok {
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t.Fatalf("v not Bug0Outer: %T", v)
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}
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outer2, ok := outer1.Bug0Field.(*Bug0Outer)
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if !ok {
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t.Fatalf("v.Bug0Field not Bug0Outer: %T", outer1.Bug0Field)
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}
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inner, ok := outer2.Bug0Field.(*Bug0Inner)
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if !ok {
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t.Fatalf("v.Bug0Field.Bug0Field not Bug0Inner: %T", outer2.Bug0Field)
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}
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if inner.A != 7 {
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t.Fatalf("final value %d; expected %d", inner.A, 7)
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}
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}
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// The bugs keep coming. We forgot to send map subtypes before the map.
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type Bug1Elem struct {
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Name string
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Id int
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}
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type Bug1StructMap map[string]Bug1Elem
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func bug1EncDec(in Bug1StructMap, out *Bug1StructMap) error {
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return nil
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}
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func TestMapBug1(t *testing.T) {
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in := make(Bug1StructMap)
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in["val1"] = Bug1Elem{"elem1", 1}
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in["val2"] = Bug1Elem{"elem2", 2}
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b := new(bytes.Buffer)
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enc := NewEncoder(b)
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err := enc.Encode(in)
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if err != nil {
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t.Fatal("encode:", err)
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}
|
|
dec := NewDecoder(b)
|
|
out := make(Bug1StructMap)
|
|
err = dec.Decode(&out)
|
|
if err != nil {
|
|
t.Fatal("decode:", err)
|
|
}
|
|
if !reflect.DeepEqual(in, out) {
|
|
t.Errorf("mismatch: %v %v", in, out)
|
|
}
|
|
}
|
|
|
|
func TestGobMapInterfaceEncode(t *testing.T) {
|
|
m := map[string]interface{}{
|
|
"up": uintptr(0),
|
|
"i0": []int{-1},
|
|
"i1": []int8{-1},
|
|
"i2": []int16{-1},
|
|
"i3": []int32{-1},
|
|
"i4": []int64{-1},
|
|
"u0": []uint{1},
|
|
"u1": []uint8{1},
|
|
"u2": []uint16{1},
|
|
"u3": []uint32{1},
|
|
"u4": []uint64{1},
|
|
"f0": []float32{1},
|
|
"f1": []float64{1},
|
|
"c0": []complex64{complex(2, -2)},
|
|
"c1": []complex128{complex(2, float64(-2))},
|
|
"us": []uintptr{0},
|
|
"bo": []bool{false},
|
|
"st": []string{"s"},
|
|
}
|
|
enc := NewEncoder(new(bytes.Buffer))
|
|
err := enc.Encode(m)
|
|
if err != nil {
|
|
t.Errorf("encode map: %s", err)
|
|
}
|
|
}
|
|
|
|
func TestSliceReusesMemory(t *testing.T) {
|
|
buf := new(bytes.Buffer)
|
|
// Bytes
|
|
{
|
|
x := []byte("abcd")
|
|
enc := NewEncoder(buf)
|
|
err := enc.Encode(x)
|
|
if err != nil {
|
|
t.Errorf("bytes: encode: %s", err)
|
|
}
|
|
// Decode into y, which is big enough.
|
|
y := []byte("ABCDE")
|
|
addr := &y[0]
|
|
dec := NewDecoder(buf)
|
|
err = dec.Decode(&y)
|
|
if err != nil {
|
|
t.Fatal("bytes: decode:", err)
|
|
}
|
|
if !bytes.Equal(x, y) {
|
|
t.Errorf("bytes: expected %q got %q\n", x, y)
|
|
}
|
|
if addr != &y[0] {
|
|
t.Errorf("bytes: unnecessary reallocation")
|
|
}
|
|
}
|
|
// general slice
|
|
{
|
|
x := []rune("abcd")
|
|
enc := NewEncoder(buf)
|
|
err := enc.Encode(x)
|
|
if err != nil {
|
|
t.Errorf("ints: encode: %s", err)
|
|
}
|
|
// Decode into y, which is big enough.
|
|
y := []rune("ABCDE")
|
|
addr := &y[0]
|
|
dec := NewDecoder(buf)
|
|
err = dec.Decode(&y)
|
|
if err != nil {
|
|
t.Fatal("ints: decode:", err)
|
|
}
|
|
if !reflect.DeepEqual(x, y) {
|
|
t.Errorf("ints: expected %q got %q\n", x, y)
|
|
}
|
|
if addr != &y[0] {
|
|
t.Errorf("ints: unnecessary reallocation")
|
|
}
|
|
}
|
|
}
|
|
|
|
// Used to crash: negative count in recvMessage.
|
|
func TestBadCount(t *testing.T) {
|
|
b := []byte{0xfb, 0xa5, 0x82, 0x2f, 0xca, 0x1}
|
|
if err := NewDecoder(bytes.NewBuffer(b)).Decode(nil); err == nil {
|
|
t.Error("expected error from bad count")
|
|
} else if err.Error() != errBadCount.Error() {
|
|
t.Error("expected bad count error; got", err)
|
|
}
|
|
}
|
|
|
|
// Verify that sequential Decoders built on a single input will
|
|
// succeed if the input implements ReadByte and there is no
|
|
// type information in the stream.
|
|
func TestSequentialDecoder(t *testing.T) {
|
|
b := new(bytes.Buffer)
|
|
enc := NewEncoder(b)
|
|
const count = 10
|
|
for i := 0; i < count; i++ {
|
|
s := fmt.Sprintf("%d", i)
|
|
if err := enc.Encode(s); err != nil {
|
|
t.Error("encoder fail:", err)
|
|
}
|
|
}
|
|
for i := 0; i < count; i++ {
|
|
dec := NewDecoder(b)
|
|
var s string
|
|
if err := dec.Decode(&s); err != nil {
|
|
t.Fatal("decoder fail:", err)
|
|
}
|
|
if s != fmt.Sprintf("%d", i) {
|
|
t.Fatalf("decode expected %d got %s", i, s)
|
|
}
|
|
}
|
|
}
|
|
|
|
// Should be able to have unrepresentable fields (chan, func) as long as they
|
|
// are unexported.
|
|
type Bug2 struct {
|
|
A int
|
|
b chan int
|
|
}
|
|
|
|
func TestUnexportedChan(t *testing.T) {
|
|
b := Bug2{23, make(chan int)}
|
|
var stream bytes.Buffer
|
|
enc := NewEncoder(&stream)
|
|
if err := enc.Encode(b); err != nil {
|
|
t.Fatalf("error encoding unexported channel: %s", err)
|
|
}
|
|
}
|
|
|
|
func TestSliceIncompatibility(t *testing.T) {
|
|
var in = []byte{1, 2, 3}
|
|
var out []int
|
|
if err := encAndDec(in, &out); err == nil {
|
|
t.Error("expected compatibility error")
|
|
}
|
|
}
|
|
|
|
// Mutually recursive slices of structs caused problems.
|
|
type Bug3 struct {
|
|
Num int
|
|
Children []*Bug3
|
|
}
|
|
|
|
func TestGobPtrSlices(t *testing.T) {
|
|
in := []*Bug3{
|
|
{1, nil},
|
|
{2, nil},
|
|
}
|
|
b := new(bytes.Buffer)
|
|
err := NewEncoder(b).Encode(&in)
|
|
if err != nil {
|
|
t.Fatal("encode:", err)
|
|
}
|
|
|
|
var out []*Bug3
|
|
err = NewDecoder(b).Decode(&out)
|
|
if err != nil {
|
|
t.Fatal("decode:", err)
|
|
}
|
|
if !reflect.DeepEqual(in, out) {
|
|
t.Fatalf("got %v; wanted %v", out, in)
|
|
}
|
|
}
|
|
|
|
// getDecEnginePtr cached engine for ut.base instead of ut.user so we passed
|
|
// a *map and then tried to reuse its engine to decode the inner map.
|
|
func TestPtrToMapOfMap(t *testing.T) {
|
|
Register(make(map[string]interface{}))
|
|
subdata := make(map[string]interface{})
|
|
subdata["bar"] = "baz"
|
|
data := make(map[string]interface{})
|
|
data["foo"] = subdata
|
|
|
|
b := new(bytes.Buffer)
|
|
err := NewEncoder(b).Encode(data)
|
|
if err != nil {
|
|
t.Fatal("encode:", err)
|
|
}
|
|
var newData map[string]interface{}
|
|
err = NewDecoder(b).Decode(&newData)
|
|
if err != nil {
|
|
t.Fatal("decode:", err)
|
|
}
|
|
if !reflect.DeepEqual(data, newData) {
|
|
t.Fatalf("expected %v got %v", data, newData)
|
|
}
|
|
}
|