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stream_test.go
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stream_test.go
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// Copyright 2010 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 json
import (
"bytes"
"fmt"
"io"
"log"
"net"
"net/http"
"net/http/httptest"
"path"
"reflect"
"runtime"
"runtime/debug"
"strings"
"testing"
)
// TODO(https://go.dev/issue/52751): Replace with native testing support.
// CaseName is a case name annotated with a file and line.
type CaseName struct {
Name string
Where CasePos
}
// Name annotates a case name with the file and line of the caller.
func Name(s string) (c CaseName) {
c.Name = s
runtime.Callers(2, c.Where.pc[:])
return c
}
// CasePos represents a file and line number.
type CasePos struct{ pc [1]uintptr }
func (pos CasePos) String() string {
frames := runtime.CallersFrames(pos.pc[:])
frame, _ := frames.Next()
return fmt.Sprintf("%s:%d", path.Base(frame.File), frame.Line)
}
// Test values for the stream test.
// One of each JSON kind.
var streamTest = []any{
0.1,
"hello",
nil,
true,
false,
[]any{"a", "b", "c"},
map[string]any{"K": "Kelvin", "ß": "long s"},
3.14, // another value to make sure something can follow map
}
var streamEncoded = `0.1
"hello"
null
true
false
["a","b","c"]
{"ß":"long s","K":"Kelvin"}
3.14
`
func TestEncoder(t *testing.T) {
for i := 0; i <= len(streamTest); i++ {
var buf strings.Builder
enc := NewEncoder(&buf)
// Check that enc.SetIndent("", "") turns off indentation.
enc.SetIndent(">", ".")
enc.SetIndent("", "")
for j, v := range streamTest[0:i] {
if err := enc.Encode(v); err != nil {
t.Fatalf("#%d.%d Encode error: %v", i, j, err)
}
}
if have, want := buf.String(), nlines(streamEncoded, i); have != want {
t.Errorf("encoding %d items: mismatch:", i)
diff(t, []byte(have), []byte(want))
break
}
}
}
func TestEncoderErrorAndReuseEncodeState(t *testing.T) {
// Disable the GC temporarily to prevent encodeState's in Pool being cleaned away during the test.
percent := debug.SetGCPercent(-1)
defer debug.SetGCPercent(percent)
// Trigger an error in Marshal with cyclic data.
type Dummy struct {
Name string
Next *Dummy
}
dummy := Dummy{Name: "Dummy"}
dummy.Next = &dummy
var buf bytes.Buffer
enc := NewEncoder(&buf)
if err := enc.Encode(dummy); err == nil {
t.Errorf("Encode(dummy) error: got nil, want non-nil")
}
type Data struct {
A string
I int
}
want := Data{A: "a", I: 1}
if err := enc.Encode(want); err != nil {
t.Errorf("Marshal error: %v", err)
}
var got Data
if err := Unmarshal(buf.Bytes(), &got); err != nil {
t.Errorf("Unmarshal error: %v", err)
}
if got != want {
t.Errorf("Marshal/Unmarshal roundtrip:\n\tgot: %v\n\twant: %v", got, want)
}
}
var streamEncodedIndent = `0.1
"hello"
null
true
false
[
>."a",
>."b",
>."c"
>]
{
>."ß": "long s",
>."K": "Kelvin"
>}
3.14
`
func TestEncoderIndent(t *testing.T) {
var buf strings.Builder
enc := NewEncoder(&buf)
enc.SetIndent(">", ".")
for _, v := range streamTest {
enc.Encode(v)
}
if have, want := buf.String(), streamEncodedIndent; have != want {
t.Error("Encode mismatch:")
diff(t, []byte(have), []byte(want))
}
}
type strMarshaler string
func (s strMarshaler) MarshalJSON() ([]byte, error) {
return []byte(s), nil
}
type strPtrMarshaler string
func (s *strPtrMarshaler) MarshalJSON() ([]byte, error) {
return []byte(*s), nil
}
func TestEncoderSetEscapeHTML(t *testing.T) {
var c C
var ct CText
var tagStruct struct {
Valid int `json:"<>&#! "`
Invalid int `json:"\\"`
}
// This case is particularly interesting, as we force the encoder to
// take the address of the Ptr field to use its MarshalJSON method. This
// is why the '&' is important.
marshalerStruct := &struct {
NonPtr strMarshaler
Ptr strPtrMarshaler
}{`"<str>"`, `"<str>"`}
// https://golang.org/issue/34154
stringOption := struct {
Bar string `json:"bar,string"`
}{`<html>foobar</html>`}
tests := []struct {
CaseName
v any
wantEscape string
want string
}{
{Name("c"), c, `"\u003c\u0026\u003e"`, `"<&>"`},
{Name("ct"), ct, `"\"\u003c\u0026\u003e\""`, `"\"<&>\""`},
{Name(`"<&>"`), "<&>", `"\u003c\u0026\u003e"`, `"<&>"`},
{
Name("tagStruct"), tagStruct,
`{"\u003c\u003e\u0026#! ":0,"Invalid":0}`,
`{"<>&#! ":0,"Invalid":0}`,
},
{
Name(`"<str>"`), marshalerStruct,
`{"NonPtr":"\u003cstr\u003e","Ptr":"\u003cstr\u003e"}`,
`{"NonPtr":"<str>","Ptr":"<str>"}`,
},
{
Name("stringOption"), stringOption,
`{"bar":"\"\\u003chtml\\u003efoobar\\u003c/html\\u003e\""}`,
`{"bar":"\"<html>foobar</html>\""}`,
},
}
for _, tt := range tests {
t.Run(tt.Name, func(t *testing.T) {
var buf strings.Builder
enc := NewEncoder(&buf)
if err := enc.Encode(tt.v); err != nil {
t.Fatalf("%s: Encode(%s) error: %s", tt.Where, tt.Name, err)
}
if got := strings.TrimSpace(buf.String()); got != tt.wantEscape {
t.Errorf("%s: Encode(%s):\n\tgot: %s\n\twant: %s", tt.Where, tt.Name, got, tt.wantEscape)
}
buf.Reset()
enc.SetEscapeHTML(false)
if err := enc.Encode(tt.v); err != nil {
t.Fatalf("%s: SetEscapeHTML(false) Encode(%s) error: %s", tt.Where, tt.Name, err)
}
if got := strings.TrimSpace(buf.String()); got != tt.want {
t.Errorf("%s: SetEscapeHTML(false) Encode(%s):\n\tgot: %s\n\twant: %s",
tt.Where, tt.Name, got, tt.want)
}
})
}
}
func TestDecoder(t *testing.T) {
for i := 0; i <= len(streamTest); i++ {
// Use stream without newlines as input,
// just to stress the decoder even more.
// Our test input does not include back-to-back numbers.
// Otherwise stripping the newlines would
// merge two adjacent JSON values.
var buf bytes.Buffer
for _, c := range nlines(streamEncoded, i) {
if c != '\n' {
buf.WriteRune(c)
}
}
out := make([]any, i)
dec := NewDecoder(&buf)
for j := range out {
if err := dec.Decode(&out[j]); err != nil {
t.Fatalf("decode #%d/%d error: %v", j, i, err)
}
}
if !reflect.DeepEqual(out, streamTest[0:i]) {
t.Errorf("decoding %d items: mismatch:", i)
for j := range out {
if !reflect.DeepEqual(out[j], streamTest[j]) {
t.Errorf("#%d:\n\tgot: %v\n\twant: %v", j, out[j], streamTest[j])
}
}
break
}
}
}
func TestDecoderBuffered(t *testing.T) {
r := strings.NewReader(`{"Name": "Gopher"} extra `)
var m struct {
Name string
}
d := NewDecoder(r)
err := d.Decode(&m)
if err != nil {
t.Fatal(err)
}
if m.Name != "Gopher" {
t.Errorf("Name = %s, want Gopher", m.Name)
}
rest, err := io.ReadAll(d.Buffered())
if err != nil {
t.Fatal(err)
}
if got, want := string(rest), " extra "; got != want {
t.Errorf("Remaining = %s, want %s", got, want)
}
}
func nlines(s string, n int) string {
if n <= 0 {
return ""
}
for i, c := range s {
if c == '\n' {
if n--; n == 0 {
return s[0 : i+1]
}
}
}
return s
}
func TestRawMessage(t *testing.T) {
var data struct {
X float64
Id RawMessage
Y float32
}
const raw = `["\u0056",null]`
const want = `{"X":0.1,"Id":["\u0056",null],"Y":0.2}`
err := Unmarshal([]byte(want), &data)
if err != nil {
t.Fatalf("Unmarshal error: %v", err)
}
if string([]byte(data.Id)) != raw {
t.Fatalf("Unmarshal:\n\tgot: %s\n\twant: %s", []byte(data.Id), raw)
}
got, err := Marshal(&data)
if err != nil {
t.Fatalf("Marshal error: %v", err)
}
if string(got) != want {
t.Fatalf("Marshal:\n\tgot: %s\n\twant: %s", got, want)
}
}
func TestNullRawMessage(t *testing.T) {
var data struct {
X float64
Id RawMessage
IdPtr *RawMessage
Y float32
}
const want = `{"X":0.1,"Id":null,"IdPtr":null,"Y":0.2}`
err := Unmarshal([]byte(want), &data)
if err != nil {
t.Fatalf("Unmarshal error: %v", err)
}
if want, got := "null", string(data.Id); want != got {
t.Fatalf("Unmarshal:\n\tgot: %s\n\twant: %s", got, want)
}
if data.IdPtr != nil {
t.Fatalf("pointer mismatch: got non-nil, want nil")
}
got, err := Marshal(&data)
if err != nil {
t.Fatalf("Marshal error: %v", err)
}
if string(got) != want {
t.Fatalf("Marshal:\n\tgot: %s\n\twant: %s", got, want)
}
}
func TestBlocking(t *testing.T) {
tests := []struct {
CaseName
in string
}{
{Name(""), `{"x": 1}`},
{Name(""), `[1, 2, 3]`},
}
for _, tt := range tests {
t.Run(tt.Name, func(t *testing.T) {
r, w := net.Pipe()
go w.Write([]byte(tt.in))
var val any
// If Decode reads beyond what w.Write writes above,
// it will block, and the test will deadlock.
if err := NewDecoder(r).Decode(&val); err != nil {
t.Errorf("%s: NewDecoder(%s).Decode error: %v", tt.Where, tt.in, err)
}
r.Close()
w.Close()
})
}
}
type decodeThis struct {
v any
}
func TestDecodeInStream(t *testing.T) {
tests := []struct {
CaseName
json string
expTokens []any
}{
// streaming token cases
{CaseName: Name(""), json: `10`, expTokens: []any{float64(10)}},
{CaseName: Name(""), json: ` [10] `, expTokens: []any{
Delim('['), float64(10), Delim(']')}},
{CaseName: Name(""), json: ` [false,10,"b"] `, expTokens: []any{
Delim('['), false, float64(10), "b", Delim(']')}},
{CaseName: Name(""), json: `{ "a": 1 }`, expTokens: []any{
Delim('{'), "a", float64(1), Delim('}')}},
{CaseName: Name(""), json: `{"a": 1, "b":"3"}`, expTokens: []any{
Delim('{'), "a", float64(1), "b", "3", Delim('}')}},
{CaseName: Name(""), json: ` [{"a": 1},{"a": 2}] `, expTokens: []any{
Delim('['),
Delim('{'), "a", float64(1), Delim('}'),
Delim('{'), "a", float64(2), Delim('}'),
Delim(']')}},
{CaseName: Name(""), json: `{"obj": {"a": 1}}`, expTokens: []any{
Delim('{'), "obj", Delim('{'), "a", float64(1), Delim('}'),
Delim('}')}},
{CaseName: Name(""), json: `{"obj": [{"a": 1}]}`, expTokens: []any{
Delim('{'), "obj", Delim('['),
Delim('{'), "a", float64(1), Delim('}'),
Delim(']'), Delim('}')}},
// streaming tokens with intermittent Decode()
{CaseName: Name(""), json: `{ "a": 1 }`, expTokens: []any{
Delim('{'), "a",
decodeThis{float64(1)},
Delim('}')}},
{CaseName: Name(""), json: ` [ { "a" : 1 } ] `, expTokens: []any{
Delim('['),
decodeThis{map[string]any{"a": float64(1)}},
Delim(']')}},
{CaseName: Name(""), json: ` [{"a": 1},{"a": 2}] `, expTokens: []any{
Delim('['),
decodeThis{map[string]any{"a": float64(1)}},
decodeThis{map[string]any{"a": float64(2)}},
Delim(']')}},
{CaseName: Name(""), json: `{ "obj" : [ { "a" : 1 } ] }`, expTokens: []any{
Delim('{'), "obj", Delim('['),
decodeThis{map[string]any{"a": float64(1)}},
Delim(']'), Delim('}')}},
{CaseName: Name(""), json: `{"obj": {"a": 1}}`, expTokens: []any{
Delim('{'), "obj",
decodeThis{map[string]any{"a": float64(1)}},
Delim('}')}},
{CaseName: Name(""), json: `{"obj": [{"a": 1}]}`, expTokens: []any{
Delim('{'), "obj",
decodeThis{[]any{
map[string]any{"a": float64(1)},
}},
Delim('}')}},
{CaseName: Name(""), json: ` [{"a": 1} {"a": 2}] `, expTokens: []any{
Delim('['),
decodeThis{map[string]any{"a": float64(1)}},
decodeThis{&SyntaxError{"expected comma after array element", 11}},
}},
{CaseName: Name(""), json: `{ "` + strings.Repeat("a", 513) + `" 1 }`, expTokens: []any{
Delim('{'), strings.Repeat("a", 513),
decodeThis{&SyntaxError{"expected colon after object key", 518}},
}},
{CaseName: Name(""), json: `{ "\a" }`, expTokens: []any{
Delim('{'),
&SyntaxError{"invalid character 'a' in string escape code", 3},
}},
{CaseName: Name(""), json: ` \a`, expTokens: []any{
&SyntaxError{"invalid character '\\\\' looking for beginning of value", 1},
}},
}
for _, tt := range tests {
t.Run(tt.Name, func(t *testing.T) {
dec := NewDecoder(strings.NewReader(tt.json))
for i, want := range tt.expTokens {
var got any
var err error
if dt, ok := want.(decodeThis); ok {
want = dt.v
err = dec.Decode(&got)
} else {
got, err = dec.Token()
}
if errWant, ok := want.(error); ok {
if err == nil || !reflect.DeepEqual(err, errWant) {
t.Fatalf("%s:\n\tinput: %s\n\tgot error: %v\n\twant error: %v", tt.Where, tt.json, err, errWant)
}
break
} else if err != nil {
t.Fatalf("%s:\n\tinput: %s\n\tgot error: %v\n\twant error: nil", tt.Where, tt.json, err)
}
if !reflect.DeepEqual(got, want) {
t.Fatalf("%s: token %d:\n\tinput: %s\n\tgot: %T(%v)\n\twant: %T(%v)", tt.Where, i, tt.json, got, got, want, want)
}
}
})
}
}
// Test from golang.org/issue/11893
func TestHTTPDecoding(t *testing.T) {
const raw = `{ "foo": "bar" }`
ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(raw))
}))
defer ts.Close()
res, err := http.Get(ts.URL)
if err != nil {
log.Fatalf("http.Get error: %v", err)
}
defer res.Body.Close()
foo := struct {
Foo string
}{}
d := NewDecoder(res.Body)
err = d.Decode(&foo)
if err != nil {
t.Fatalf("Decode error: %v", err)
}
if foo.Foo != "bar" {
t.Errorf(`Decode: got %q, want "bar"`, foo.Foo)
}
// make sure we get the EOF the second time
err = d.Decode(&foo)
if err != io.EOF {
t.Errorf("Decode error:\n\tgot: %v\n\twant: io.EOF", err)
}
}