mirror of
https://github.com/golang/go
synced 2024-10-05 05:11:25 -06:00
e76a335ada
than io.Readers and io.Writers. change the Encoder/Decoder protocol so that each message is preceded by its length in bytes. R=rsc DELTA=468 (119 added, 23 deleted, 326 changed) OCL=31700 CL=31702
234 lines
5.6 KiB
Go
234 lines
5.6 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package gob
|
|
|
|
import (
|
|
"bytes";
|
|
"gob";
|
|
"os";
|
|
"reflect";
|
|
"strings";
|
|
"testing";
|
|
"unsafe";
|
|
)
|
|
|
|
type ET2 struct {
|
|
x string;
|
|
}
|
|
|
|
type ET1 struct {
|
|
a int;
|
|
et2 *ET2;
|
|
next *ET1;
|
|
}
|
|
|
|
// Like ET1 but with a different name for a field
|
|
type ET3 struct {
|
|
a int;
|
|
et2 *ET2;
|
|
differentNext *ET1;
|
|
}
|
|
|
|
// Like ET1 but with a different type for a field
|
|
type ET4 struct {
|
|
a int;
|
|
et2 *ET1;
|
|
next *ET2;
|
|
}
|
|
|
|
// Like ET1 but with a different type for a self-referencing field
|
|
type ET5 struct {
|
|
a int;
|
|
et2 *ET2;
|
|
next *ET1;
|
|
}
|
|
|
|
func TestBasicEncoder(t *testing.T) {
|
|
b := new(bytes.Buffer);
|
|
enc := NewEncoder(b);
|
|
et1 := new(ET1);
|
|
et1.a = 7;
|
|
et1.et2 = new(ET2);
|
|
enc.Encode(et1);
|
|
if enc.state.err != nil {
|
|
t.Error("encoder fail:", enc.state.err)
|
|
}
|
|
|
|
// Decode the result by hand to verify;
|
|
state := new(decodeState);
|
|
state.b = b;
|
|
// The output should be:
|
|
// 0) The length, 38.
|
|
length := decodeUint(state);
|
|
if length != 38 {
|
|
t.Fatal("0. expected length 38; got", length);
|
|
}
|
|
// 1) -7: the type id of ET1
|
|
id1 := decodeInt(state);
|
|
if id1 >= 0 {
|
|
t.Fatal("expected ET1 negative id; got", id1);
|
|
}
|
|
// 2) The wireType for ET1
|
|
wire1 := new(wireType);
|
|
err := decode(b, wire1);
|
|
if err != nil {
|
|
t.Fatal("error decoding ET1 type:", err);
|
|
}
|
|
info := getTypeInfo(reflect.Typeof(ET1{}));
|
|
trueWire1 := &wireType{s: info.typeId.gobType().(*structType)};
|
|
if !reflect.DeepEqual(wire1, trueWire1) {
|
|
t.Fatalf("invalid wireType for ET1: expected %+v; got %+v\n", *trueWire1, *wire1);
|
|
}
|
|
// 3) The length, 21.
|
|
length = decodeUint(state);
|
|
if length != 21 {
|
|
t.Fatal("3. expected length 21; got", length);
|
|
}
|
|
// 4) -8: the type id of ET2
|
|
id2 := decodeInt(state);
|
|
if id2 >= 0 {
|
|
t.Fatal("expected ET2 negative id; got", id2);
|
|
}
|
|
// 5) The wireType for ET2
|
|
wire2 := new(wireType);
|
|
err = decode(b, wire2);
|
|
if err != nil {
|
|
t.Fatal("error decoding ET2 type:", err);
|
|
}
|
|
info = getTypeInfo(reflect.Typeof(ET2{}));
|
|
trueWire2 := &wireType{s: info.typeId.gobType().(*structType)};
|
|
if !reflect.DeepEqual(wire2, trueWire2) {
|
|
t.Fatalf("invalid wireType for ET2: expected %+v; got %+v\n", *trueWire2, *wire2);
|
|
}
|
|
// 6) The length, 6.
|
|
length = decodeUint(state);
|
|
if length != 6 {
|
|
t.Fatal("6. expected length 6; got", length);
|
|
}
|
|
// 7) The type id for the et1 value
|
|
newId1 := decodeInt(state);
|
|
if newId1 != -id1 {
|
|
t.Fatal("expected Et1 id", -id1, "got", newId1);
|
|
}
|
|
// 8) The value of et1
|
|
newEt1 := new(ET1);
|
|
err = decode(b, newEt1);
|
|
if err != nil {
|
|
t.Fatal("error decoding ET1 value:", err);
|
|
}
|
|
if !reflect.DeepEqual(et1, newEt1) {
|
|
t.Fatalf("invalid data for et1: expected %+v; got %+v\n", *et1, *newEt1);
|
|
}
|
|
// 9) EOF
|
|
if b.Len() != 0 {
|
|
t.Error("not at eof;", b.Len(), "bytes left")
|
|
}
|
|
|
|
// Now do it again. This time we should see only the type id and value.
|
|
b.Reset();
|
|
enc.Encode(et1);
|
|
if enc.state.err != nil {
|
|
t.Error("2nd round: encoder fail:", enc.state.err)
|
|
}
|
|
// The length.
|
|
length = decodeUint(state);
|
|
if length != 6 {
|
|
t.Fatal("6. expected length 6; got", length);
|
|
}
|
|
// 5a) The type id for the et1 value
|
|
newId1 = decodeInt(state);
|
|
if newId1 != -id1 {
|
|
t.Fatal("2nd round: expected Et1 id", -id1, "got", newId1);
|
|
}
|
|
// 6a) The value of et1
|
|
newEt1 = new(ET1);
|
|
err = decode(b, newEt1);
|
|
if err != nil {
|
|
t.Fatal("2nd round: error decoding ET1 value:", err);
|
|
}
|
|
if !reflect.DeepEqual(et1, newEt1) {
|
|
t.Fatalf("2nd round: invalid data for et1: expected %+v; got %+v\n", *et1, *newEt1);
|
|
}
|
|
// 7a) EOF
|
|
if b.Len() != 0 {
|
|
t.Error("2nd round: not at eof;", b.Len(), "bytes left")
|
|
}
|
|
}
|
|
|
|
func TestEncoderDecoder(t *testing.T) {
|
|
b := new(bytes.Buffer);
|
|
enc := NewEncoder(b);
|
|
et1 := new(ET1);
|
|
et1.a = 7;
|
|
et1.et2 = new(ET2);
|
|
enc.Encode(et1);
|
|
if enc.state.err != nil {
|
|
t.Error("encoder fail:", enc.state.err)
|
|
}
|
|
dec := NewDecoder(b);
|
|
newEt1 := new(ET1);
|
|
dec.Decode(newEt1);
|
|
if dec.state.err != nil {
|
|
t.Fatalf("error decoding ET1:", dec.state.err);
|
|
}
|
|
|
|
if !reflect.DeepEqual(et1, newEt1) {
|
|
t.Fatalf("invalid data for et1: expected %+v; got %+v\n", *et1, *newEt1);
|
|
}
|
|
if b.Len() != 0 {
|
|
t.Error("not at eof;", b.Len(), "bytes left")
|
|
}
|
|
|
|
enc.Encode(et1);
|
|
newEt1 = new(ET1);
|
|
dec.Decode(newEt1);
|
|
if dec.state.err != nil {
|
|
t.Fatalf("round 2: error decoding ET1:", dec.state.err);
|
|
}
|
|
if !reflect.DeepEqual(et1, newEt1) {
|
|
t.Fatalf("round 2: invalid data for et1: expected %+v; got %+v\n", *et1, *newEt1);
|
|
}
|
|
if b.Len() != 0 {
|
|
t.Error("round 2: not at eof;", b.Len(), "bytes left")
|
|
}
|
|
|
|
// Now test with a running encoder/decoder pair that we recognize a type mismatch.
|
|
enc.Encode(et1);
|
|
if enc.state.err != nil {
|
|
t.Error("round 3: encoder fail:", enc.state.err)
|
|
}
|
|
newEt2 := new(ET2);
|
|
dec.Decode(newEt2);
|
|
if dec.state.err == nil {
|
|
t.Fatalf("round 3: expected `bad type' error decoding ET2");
|
|
}
|
|
}
|
|
|
|
// Run one value through the encoder/decoder, but use the wrong type.
|
|
func badTypeCheck(e interface{}, msg string, t *testing.T) {
|
|
b := new(bytes.Buffer);
|
|
enc := NewEncoder(b);
|
|
et1 := new(ET1);
|
|
et1.a = 7;
|
|
et1.et2 = new(ET2);
|
|
enc.Encode(et1);
|
|
if enc.state.err != nil {
|
|
t.Error("encoder fail:", enc.state.err)
|
|
}
|
|
dec := NewDecoder(b);
|
|
dec.Decode(e);
|
|
if dec.state.err == nil {
|
|
t.Error("expected error for", msg);
|
|
}
|
|
}
|
|
|
|
// Test that we recognize a bad type the first time.
|
|
func TestWrongTypeDecoder(t *testing.T) {
|
|
badTypeCheck(new(ET2), "different number of fields", t);
|
|
badTypeCheck(new(ET3), "different name of field", t);
|
|
badTypeCheck(new(ET4), "different type of field", t);
|
|
badTypeCheck(new(ET5), "different type of self-reference field", t);
|
|
}
|