-
Notifications
You must be signed in to change notification settings - Fork 112
/
codec.go
539 lines (473 loc) · 12.7 KB
/
codec.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
// pack/unpack fixed length variable
package hessian
import (
"encoding/binary"
"fmt"
"math"
"reflect"
"strings"
perrors "github.com/pkg/errors"
)
var (
_zeroBoolPinter *bool
_zeroValue = reflect.ValueOf(_zeroBoolPinter).Elem()
)
func encByte(b []byte, t ...byte) []byte {
return append(b, t...)
}
// validateIntKind check whether k is int kind
func validateIntKind(k reflect.Kind) bool {
switch k {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return true
default:
return false
}
}
// validateUintKind check whether k is uint kind
func validateUintKind(k reflect.Kind) bool {
switch k {
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
return true
default:
return false
}
}
// validateFloatKind check whether k is float kind
func validateFloatKind(k reflect.Kind) bool {
switch k {
case reflect.Float32, reflect.Float64:
return true
default:
return false
}
}
// PackInt8 packs int to byte array
func PackInt8(v int8, b []byte) []byte {
return append(b, byte(v))
}
// PackInt16 packs int16 to byte array
// [10].pack('N').bytes => [0, 0, 0, 10]
func PackInt16(v int16) []byte {
var array [2]byte
binary.BigEndian.PutUint16(array[:2], uint16(v))
return array[:]
}
// PackUint16 packs uint16 to byte array
// [10].pack('N').bytes => [0, 0, 0, 10]
func PackUint16(v uint16) []byte {
var array [2]byte
binary.BigEndian.PutUint16(array[:2], v)
return array[:]
}
// PackInt32 packs int32 to byte array
// [10].pack('N').bytes => [0, 0, 0, 10]
func PackInt32(v int32) []byte {
var array [4]byte
binary.BigEndian.PutUint32(array[:4], uint32(v))
return array[:]
}
// PackInt64 packs int64 to byte array
// [10].pack('q>').bytes => [0, 0, 0, 0, 0, 0, 0, 10]
func PackInt64(v int64) []byte {
var array [8]byte
binary.BigEndian.PutUint64(array[:8], uint64(v))
return array[:]
}
// PackFloat64 packs float64 to byte array
// [10].pack('G').bytes => [64, 36, 0, 0, 0, 0, 0, 0]
// PackFloat64 invokes go's official math library function Float64bits.
func PackFloat64(v float64) []byte {
var array [8]byte
binary.BigEndian.PutUint64(array[:8], math.Float64bits(v))
return array[:]
}
// UnpackInt16 unpacks int16 from byte array
// (0,2).unpack('n')
func UnpackInt16(b []byte) int16 {
arr := b[:2]
return int16(binary.BigEndian.Uint16(arr))
}
// UnpackUint16 unpacks int16 from byte array
// (0,2).unpack('n')
func UnpackUint16(b []byte) uint16 {
arr := b[:2]
return binary.BigEndian.Uint16(arr)
}
// UnpackInt32 unpacks int32 from byte array
// (0,4).unpack('N')
func UnpackInt32(b []byte) int32 {
arr := b[:4]
return int32(binary.BigEndian.Uint32(arr))
}
// UnpackInt64 unpacks int64 from byte array
// long (0,8).unpack('q>')
func UnpackInt64(b []byte) int64 {
arr := b[:8]
return int64(binary.BigEndian.Uint64(arr))
}
// UnpackFloat64 unpacks float64 from byte array
// Double (0,8).unpack('G)
func UnpackFloat64(b []byte) float64 {
arr := b[:8]
return math.Float64frombits(binary.BigEndian.Uint64(arr))
}
// UnpackPtr unpack pointer value to original value
func UnpackPtr(v reflect.Value) reflect.Value {
for v.Kind() == reflect.Ptr {
v = v.Elem()
}
return v
}
// PackPtr pack a Ptr value
func PackPtr(v reflect.Value) reflect.Value {
vv := reflect.New(v.Type())
vv.Elem().Set(v)
return vv
}
// UnpackPtrType unpack pointer type to original type
func UnpackPtrType(typ reflect.Type) reflect.Type {
for typ.Kind() == reflect.Ptr {
typ = typ.Elem()
}
return typ
}
// UnpackType unpack pointer type to original type and return the pointer depth.
func UnpackType(typ reflect.Type) (reflect.Type, int) {
depth := 0
for typ.Kind() == reflect.Ptr {
typ = typ.Elem()
depth++
}
return typ, depth
}
// UnpackPtrValue unpack pointer value to original value
// return the pointer if its elem is zero value, because lots of operations on zero value is invalid
func UnpackPtrValue(v reflect.Value) reflect.Value {
for v.Kind() == reflect.Ptr && v.Elem().IsValid() {
v = v.Elem()
}
return v
}
// UnpackToRootAddressableValue unpack pointer value to the root addressable value.
func UnpackToRootAddressableValue(v reflect.Value) reflect.Value {
for v.Kind() == reflect.Ptr && v.Elem().CanAddr() {
v = v.Elem()
}
return v
}
// SprintHex converts the []byte to a Hex string.
func SprintHex(b []byte) (rs string) {
rs = fmt.Sprintf("[]byte{")
for _, v := range b {
rs += fmt.Sprintf("0x%02x,", v)
}
rs = strings.TrimSpace(rs)
rs += fmt.Sprintf("}\n")
return
}
// EnsurePackValue pack the interface with value
func EnsurePackValue(in interface{}) reflect.Value {
if v, ok := in.(reflect.Value); ok {
return v
}
return reflect.ValueOf(in)
}
// EnsureInterface get value of reflect.Value
// return original value if not reflect.Value
func EnsureInterface(in interface{}, err error) (interface{}, error) {
if err != nil {
return in, err
}
return EnsureRawAny(in), nil
}
// EnsureRawValue pack the interface with value, and make sure it's not a ref holder
func EnsureRawValue(in interface{}) reflect.Value {
if v, ok := in.(reflect.Value); ok {
if v.IsValid() {
if r, ok := v.Interface().(*_refHolder); ok {
return r.value
}
}
return v
}
if v, ok := in.(*_refHolder); ok {
return v.value
}
return reflect.ValueOf(in)
}
// EnsureRawAny unpack if in is a reflect.Value or a ref holder.
func EnsureRawAny(in interface{}) interface{} {
if v, ok := in.(reflect.Value); ok {
if !v.IsValid() {
return nil
}
in = v.Interface()
}
if v, ok := in.(*_refHolder); ok {
in = v.value
}
if v, ok := in.(reflect.Value); ok {
if !v.IsValid() {
return nil
}
in = v.Interface()
}
return in
}
// SetValue set the value to dest.
// It will auto check the Ptr pack level and unpack/pack to the right level.
// It makes sure success to set value
func SetValue(dest, v reflect.Value) {
// zero value not need to set
if !v.IsValid() {
return
}
vType := v.Type()
destType := dest.Type()
// for most cases, the types are the same and can set the value directly.
if dest.CanSet() && destType == vType {
dest.Set(v)
return
}
// check whether the v is a ref holder
if vType == _refHolderPtrType {
h := v.Interface().(*_refHolder)
h.add(dest)
return
}
vRawType, vPtrDepth := UnpackType(vType)
// unpack to the root addressable value, so that to set the value.
dest = UnpackToRootAddressableValue(dest)
destType = dest.Type()
destRawType, destPtrDepth := UnpackType(destType)
// it can set the value directly if the raw types are of the same type.
if destRawType == vRawType {
if destPtrDepth > vPtrDepth {
// pack to the same level of dest
for i := 0; i < destPtrDepth-vPtrDepth; i++ {
v = PackPtr(v)
}
} else if destPtrDepth < vPtrDepth {
// unpack to the same level of dest
for i := 0; i < vPtrDepth-destPtrDepth; i++ {
v = v.Elem()
}
}
dest.Set(v)
return
}
switch destType.Kind() {
case reflect.Float32, reflect.Float64:
dest.SetFloat(v.Float())
return
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
dest.SetInt(v.Int())
return
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
// hessian only support 64-bit signed long integer.
dest.SetUint(uint64(v.Int()))
return
case reflect.Ptr:
SetValueToPtrDest(dest, v)
return
default:
// It's ok when the dest is an interface{}, while the v is a pointer.
dest.Set(v)
}
}
// SetValueToPtrDest set the raw value to a pointer dest.
func SetValueToPtrDest(dest reflect.Value, v reflect.Value) {
// for number, the type of value may be different with the dest,
// must convert it to the correct type of value then set.
switch dest.Type() {
case _typeOfIntPtr:
vv := v.Int()
dest.Set(reflect.ValueOf(&vv))
return
case _typeOfInt8Ptr:
vv := int8(v.Int())
dest.Set(reflect.ValueOf(&vv))
return
case _typeOfInt16Ptr:
vv := int16(v.Int())
dest.Set(reflect.ValueOf(&vv))
return
case _typeOfInt32Ptr:
if v.Kind() == reflect.String {
vv := rune(v.String()[0])
dest.Set(reflect.ValueOf(&vv))
return
}
vv := int32(v.Int())
dest.Set(reflect.ValueOf(&vv))
return
case _typeOfInt64Ptr:
vv := v.Int()
dest.Set(reflect.ValueOf(&vv))
return
case _typeOfUintPtr:
vv := uint(v.Uint())
dest.Set(reflect.ValueOf(&vv))
return
case _typeOfUint8Ptr:
// v is a int32 here.
vv := uint8(v.Int())
dest.Set(reflect.ValueOf(&vv))
return
case _typeOfUint16Ptr:
vv := uint16(v.Uint())
dest.Set(reflect.ValueOf(&vv))
return
case _typeOfUint32Ptr:
vv := uint32(v.Uint())
dest.Set(reflect.ValueOf(&vv))
return
case _typeOfUint64Ptr:
vv := v.Uint()
dest.Set(reflect.ValueOf(&vv))
return
case _typeOfFloat32Ptr:
vv := float32(v.Float())
dest.Set(reflect.ValueOf(&vv))
case _typeOfFloat64Ptr:
vv := v.Float()
dest.Set(reflect.ValueOf(&vv))
return
case _typeOfRunePtr:
if v.Kind() == reflect.String {
vv := Rune(v.String()[0])
dest.Set(reflect.ValueOf(&vv))
return
}
vv := Rune(v.Int())
dest.Set(reflect.ValueOf(&vv))
return
default:
dest.Set(v)
}
}
// AddrEqual compares addrs
func AddrEqual(x, y interface{}) bool {
if x == nil || y == nil {
return x == y
}
v1 := reflect.ValueOf(x)
v2 := reflect.ValueOf(y)
if v1.Type() != v2.Type() {
return false
}
if v1.Kind() != reflect.Ptr {
v1 = PackPtr(v1)
v2 = PackPtr(v2)
}
return v1.Pointer() == v2.Pointer()
}
// SetSlice set value into slice object
func SetSlice(dest reflect.Value, objects interface{}) error {
if objects == nil {
return nil
}
dest = UnpackPtrValue(dest)
destTyp := UnpackPtrType(dest.Type())
elemKind := destTyp.Elem().Kind()
if elemKind == reflect.Uint8 {
// for binary
dest.Set(EnsureRawValue(objects))
return nil
}
if ref, ok := objects.(*_refHolder); ok {
return unpackRefHolder(dest, destTyp, ref)
}
v := EnsurePackValue(objects)
if h, ok := v.Interface().(*_refHolder); ok {
// if the object is a ref one, just add the destination list to wait delay initialization
h.add(dest)
return nil
}
v, err := ConvertSliceValueType(destTyp, v)
if err != nil {
return err
}
SetValue(dest, v)
return nil
}
// unpackRefHolder unpack the ref holder when decoding slice finished.
func unpackRefHolder(dest reflect.Value, destTyp reflect.Type, ref *_refHolder) error {
v, err := ConvertSliceValueType(destTyp, ref.value)
if err != nil {
return err
}
SetValue(dest, v)
ref.change(v) // change finally
ref.notify() // delay set value to all destinations
return nil
}
// ConvertSliceValueType convert to slice of destination type
func ConvertSliceValueType(destTyp reflect.Type, v reflect.Value) (reflect.Value, error) {
if destTyp == v.Type() || destTyp.Kind() == reflect.Interface {
return v, nil
}
k := v.Type().Kind()
if k != reflect.Slice && k != reflect.Array {
return _zeroValue, perrors.Errorf("expect slice type, but get %v, objects: %v", k, v)
}
if v.Len() <= 0 {
return _zeroValue, nil
}
elemKind := destTyp.Elem().Kind()
elemPtrType := elemKind == reflect.Ptr
elemFloatType := validateFloatKind(elemKind)
elemIntType := validateIntKind(elemKind)
elemUintType := validateUintKind(elemKind)
sl := reflect.MakeSlice(destTyp, v.Len(), v.Len())
var itemValue reflect.Value
for i := 0; i < v.Len(); i++ {
item := v.Index(i).Interface()
if cv, ok := item.(reflect.Value); ok {
itemValue = cv
} else {
if item == nil {
itemValue = reflect.Zero(destTyp.Elem())
} else {
itemValue = reflect.ValueOf(item)
}
}
if !elemPtrType && itemValue.Kind() == reflect.Ptr {
itemValue = UnpackPtrValue(itemValue)
}
switch {
case elemFloatType:
sl.Index(i).SetFloat(itemValue.Float())
case elemIntType:
sl.Index(i).SetInt(itemValue.Int())
case elemUintType:
sl.Index(i).SetUint(itemValue.Uint())
default:
SetValue(sl.Index(i), itemValue)
}
}
return sl, nil
}
// PackPtrInterface pack struct interface to pointer interface
func PackPtrInterface(s interface{}, value reflect.Value) interface{} {
vv := reflect.New(reflect.TypeOf(s))
vv.Elem().Set(value)
return vv.Interface()
}