decode.decodeItem - Code Metrics - et-nik/binngo - Measure and Improve Code Quality continuously with Scrutinizer

decode.decodeItem F
last analyzed 2025-11-03 19:42 UTC

↳ Parent: decode/decode.go

Complexity

Conditions

Size

Total Lines	97
Code Lines	77

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	49
CRAP Score	27.3203

Importance

Changes

Metric	Value
cc	26
eloc	77
dl	0
loc	97
c	0
b	0
f	0
ccs	49
cts	56
cp	0.875
crap	27.3203
rs	0
nop	3

How to fix Long Method Complexity

package decode

import (
	"bytes"
	"io"
	"reflect"
	"sync"

	"github.com/cstockton/go-conv"
	"github.com/et-nik/binngo/binn"
	"github.com/et-nik/binngo/encode"
)

const (
	maxOneByteSize = 127
)

type decodeFunc func(reader io.Reader, v interface{}) error

var decoderCache sync.Map // map[binn.Type]decodeFunc

type readLen int

func decode(reader io.Reader, v interface{}) error {
	rv := reflect.ValueOf(v)
	rt := reflect.TypeOf(v)
	if rv.Kind() != reflect.Ptr || rv.IsNil() {
		return &InvalidUnmarshalError{rt}
	}

	containerType, _, err := readType(reader)
	if err != nil {
		return err
	}

	if rt.Implements(unmarshalerType) && isStorageContainer(containerType) {
		return decodeUnmarshalerStorage(containerType, reader, v)
	}

	return decodeStorage(containerType, reader, v)
}

func decodeUnmarshalerStorage(containerType binn.Type, reader io.Reader, v interface{}) error {
	size, ln, err := readSize(reader)
	if err != nil {
		return err
	}

	typeSize := len(encode.Int(int(containerType)))

	buf := make([]byte, size-int(ln)-typeSize)
	n, err := reader.Read(buf)
	if err != nil {
		return err
	}

	if n != len(buf) {
		return ErrIncompleteRead
	}

	data := make([]byte, 0, size)
	data = append(data, encode.Uint8(uint8(containerType))...)
	data = append(data, encode.Size(size, false)...)
	data = append(data, buf...)

	err = decodeUnmarshaler(data, v)
	if err != nil {
		return err
	}

	return nil
}

func decodeStorage(containerType binn.Type, reader io.Reader, v interface{}) error {
	decoder := loadDecodeFunc(containerType)
	return decoder(reader, v)
}

//nolint:funlen
func decodeItem(rt reflect.Type, btype binn.Type, bval []byte) (interface{}, error) {
	var v interface{}
	var err error

	switch btype {
	case binn.Null:
		return nil, nil
	case binn.True:
		return true, nil
	case binn.False:
		return false, nil
	case binn.Uint8Type:
		v = Uint8(bval)
	case binn.Uint16Type:
		v = Uint16(bval)
	case binn.Uint32Type:
		v = Uint32(bval)
	case binn.Uint64Type:
		v = Uint64(bval)
	case binn.Int8Type:
		v = Int8(bval)
	case binn.Int16Type:
		v = Int16(bval)
	case binn.Int32Type:
		v = Int32(bval)
	case binn.Int64Type:
		v = Int64(bval)
	case binn.Float32Type:
		v = Float32(bval)
	case binn.Float64Type:
		v = Float64(bval)
	case binn.StringType:
		v = String(bval[:len(bval)-1])
	case binn.BlobType:
		v = bval
	case binn.ListType:
		var l []interface{}
		br := bytes.NewReader(bval)
		_, wasReadLen, _ := readSize(br)
		cnt, wasReadCnt, _ := readSize(br)
		wasRead := wasReadLen + wasReadCnt

		err = decodeListItems(br, &l, len(bval)-int(wasRead), wasRead, cnt)
		if err != nil {
			return nil, err
		}

		return l, nil
	case binn.MapType:
		br := bytes.NewReader(bval)
		sz, rlsize, _ := readSize(br)
		cnt, rlcnt, _ := readSize(br)

		mapType := reflect.MapOf(reflect.TypeOf(int(0)), rt.Elem())
		ptr := reflect.New(mapType)
		ptr.Elem().Set(reflect.MakeMap(mapType))
		m := ptr.Interface()

		err = decodeMapItems(br, m, sz, rlsize+rlcnt, cnt)
		if err != nil {
			return nil, err
		}

		return reflect.ValueOf(m).Elem().Interface(), nil
	case binn.ObjectType:
		var obj interface{}
		if rt.Kind() == reflect.Interface {
			obj = map[string]interface{}{}
		} else {
			ptr := reflect.New(rt)
			obj = ptr.Interface()
		}

		br := bytes.NewReader(bval)

		err = decodeStorage(btype, br, &obj)

		if err != nil {
			return nil, err
		}

		return obj, nil
	}

	if rt.Kind() == reflect.Interface {
		v, err = convertToKind(kindMapper[btype], v)
		if err != nil {
			return nil, err
		}
	} else {
		v, err = convertToType(rt, v)
		if err != nil {
			return nil, err
		}
	}

	return v, nil
}

func loadDecodeFunc(bt binn.Type) decodeFunc {
	if fi, ok := decoderCache.Load(bt); ok {
		return fi.(decodeFunc)
	}

	var (
		wg sync.WaitGroup
		f  decodeFunc
	)
	wg.Add(1)
	fi, loaded := decoderCache.LoadOrStore(bt, decodeFunc(func(reader io.Reader, v interface{}) error {
		wg.Wait()
		return f(reader, v)
	}))
	if loaded {
		return fi.(decodeFunc)
	}

	f = newTypeDecoder(bt)
	wg.Done()
	decoderCache.Store(bt, f)
	return f
}

func newTypeDecoder(bt binn.Type) decodeFunc {
	switch bt {
	case binn.ListType:
		return decodeList
	case binn.MapType:
		return decodeMap
	case binn.ObjectType:
		return decodeObject
	case binn.Null:
		return func(_ io.Reader, _ interface{}) error {
			return nil
		}
	}

	decoder := newValueDecoder(bt)
	return decoder.DecodeValue
}

func convertToType(rt reflect.Type, val interface{}) (interface{}, error) {
	switch rt.Kind() {
	case reflect.Interface:
		return val, nil
	case reflect.Ptr:
		return convertToType(rt.Elem(), val)
	default:
		return convertToKind(rt.Kind(), val)
	}
}

func convertToKind(rk reflect.Kind, v interface{}) (interface{}, error) {
	switch rk {
	case reflect.Int:
		return conv.Int(v)
	case reflect.Int8:
		return conv.Int8(v)
	case reflect.Int16:
		return conv.Int16(v)
	case reflect.Int32:
		return conv.Int32(v)
	case reflect.Int64:
		return conv.Int64(v)
	case reflect.Uint:
		return conv.Uint(v)
	case reflect.Uint8:
		return conv.Uint8(v)
	case reflect.Uint16:
		return conv.Uint16(v)
	case reflect.Uint32:
		return conv.Uint32(v)
	case reflect.Uint64:
		return conv.Uint64(v)
	case reflect.Bool:
		return conv.Bool(v)
	case reflect.String:
		return conv.String(v)
	}

	return v, nil
}


1		package decode
2
3		import (
4		"bytes"
5		"io"
6		"reflect"
7		"sync"
8
9		"github.com/cstockton/go-conv"
10		"github.com/et-nik/binngo/binn"
11		"github.com/et-nik/binngo/encode"
12		)
13
14		const (
15		maxOneByteSize = 127
16		)
17
18		type decodeFunc func(reader io.Reader, v interface{}) error
19
20		var decoderCache sync.Map // map[binn.Type]decodeFunc
21
22		type readLen int
23
24		func decode(reader io.Reader, v interface{}) error {
25	1	rv := reflect.ValueOf(v)
26	1	rt := reflect.TypeOf(v)
27	1	if rv.Kind() != reflect.Ptr \|\| rv.IsNil() {
28		return &InvalidUnmarshalError{rt}
29		}
30
31	1	containerType, _, err := readType(reader)
32	1	if err != nil {
33		return err
34		}
35
36	1	if rt.Implements(unmarshalerType) && isStorageContainer(containerType) {
37	1	return decodeUnmarshalerStorage(containerType, reader, v)
38		}
39
40	1	return decodeStorage(containerType, reader, v)
41		}
42
43		func decodeUnmarshalerStorage(containerType binn.Type, reader io.Reader, v interface{}) error {
44	1	size, ln, err := readSize(reader)
45	1	if err != nil {
46		return err
47		}
48
49	1	typeSize := len(encode.Int(int(containerType)))
50
51	1	buf := make([]byte, size-int(ln)-typeSize)
52	1	n, err := reader.Read(buf)
53	1	if err != nil {
54		return err
55		}
56
57	1	if n != len(buf) {
58	1	return ErrIncompleteRead
59		}
60
61	1	data := make([]byte, 0, size)
62	1	data = append(data, encode.Uint8(uint8(containerType))...)
63	1	data = append(data, encode.Size(size, false)...)
64	1	data = append(data, buf...)
65
66	1	err = decodeUnmarshaler(data, v)
67	1	if err != nil {
68		return err
69		}
70
71	1	return nil
72		}
73
74		func decodeStorage(containerType binn.Type, reader io.Reader, v interface{}) error {
75	1	decoder := loadDecodeFunc(containerType)
76	1	return decoder(reader, v)
77		}
78
79		//nolint:funlen
80		func decodeItem(rt reflect.Type, btype binn.Type, bval []byte) (interface{}, error) {
81	1	var v interface{}
82	1	var err error
83
84	1	switch btype {
85		case binn.Null:
86		return nil, nil
87		case binn.True:
88	1	return true, nil
89		case binn.False:
90	1	return false, nil
91		case binn.Uint8Type:
92	1	v = Uint8(bval)
93		case binn.Uint16Type:
94	1	v = Uint16(bval)
95		case binn.Uint32Type:
96	1	v = Uint32(bval)
97		case binn.Uint64Type:
98	1	v = Uint64(bval)
99		case binn.Int8Type:
100	1	v = Int8(bval)
101		case binn.Int16Type:
102	1	v = Int16(bval)
103		case binn.Int32Type:
104	1	v = Int32(bval)
105		case binn.Int64Type:
106	1	v = Int64(bval)
107		case binn.Float32Type:
108	1	v = Float32(bval)
109		case binn.Float64Type:
110	1	v = Float64(bval)
111		case binn.StringType:
112	1	v = String(bval[:len(bval)-1])
113		case binn.BlobType:
114	1	v = bval
115		case binn.ListType:
116	1	var l []interface{}
117	1	br := bytes.NewReader(bval)
118	1	_, wasReadLen, _ := readSize(br)
119	1	cnt, wasReadCnt, _ := readSize(br)
120	1	wasRead := wasReadLen + wasReadCnt
121
122	1	err = decodeListItems(br, &l, len(bval)-int(wasRead), wasRead, cnt)
123	1	if err != nil {
124		return nil, err
125		}
126
127	1	return l, nil
128		case binn.MapType:
129	1	br := bytes.NewReader(bval)
130	1	sz, rlsize, _ := readSize(br)
131	1	cnt, rlcnt, _ := readSize(br)
132
133	1	mapType := reflect.MapOf(reflect.TypeOf(int(0)), rt.Elem())
134	1	ptr := reflect.New(mapType)
135	1	ptr.Elem().Set(reflect.MakeMap(mapType))
136	1	m := ptr.Interface()
137
138	1	err = decodeMapItems(br, m, sz, rlsize+rlcnt, cnt)
139	1	if err != nil {
140		return nil, err
141		}
142
143	1	return reflect.ValueOf(m).Elem().Interface(), nil
144		case binn.ObjectType:
145	1	var obj interface{}
146	1	if rt.Kind() == reflect.Interface {
147		obj = map[string]interface{}{}
148		} else {
149	1	ptr := reflect.New(rt)
150	1	obj = ptr.Interface()
151		}
152
153	1	br := bytes.NewReader(bval)
154
155	1	err = decodeStorage(btype, br, &obj)
156
157	1	if err != nil {
158		return nil, err
159		}
160
161	1	return obj, nil
162		}
163
164	1	if rt.Kind() == reflect.Interface {
165	1	v, err = convertToKind(kindMapper[btype], v)
166	1	if err != nil {
167		return nil, err
168		}
169		} else {
170	1	v, err = convertToType(rt, v)
171	1	if err != nil {
172		return nil, err
173		}
174		}
175
176	1	return v, nil
177		}
178
179		func loadDecodeFunc(bt binn.Type) decodeFunc {
180	1	if fi, ok := decoderCache.Load(bt); ok {
181	1	return fi.(decodeFunc)
182		}
183
184	1	var (
185		wg sync.WaitGroup
186		f decodeFunc
187		)
188	1	wg.Add(1)
189	1	fi, loaded := decoderCache.LoadOrStore(bt, decodeFunc(func(reader io.Reader, v interface{}) error {
190		wg.Wait()
191		return f(reader, v)
192		}))
193	1	if loaded {
194		return fi.(decodeFunc)
195		}
196
197	1	f = newTypeDecoder(bt)
198	1	wg.Done()
199	1	decoderCache.Store(bt, f)
200	1	return f
201		}
202
203		func newTypeDecoder(bt binn.Type) decodeFunc {
204	1	switch bt {
205		case binn.ListType:
206	1	return decodeList
207		case binn.MapType:
208	1	return decodeMap
209		case binn.ObjectType:
210	1	return decodeObject
211		case binn.Null:
212	1	return func(_ io.Reader, _ interface{}) error {
213	1	return nil
214		}
215		}
216
217	1	decoder := newValueDecoder(bt)
218	1	return decoder.DecodeValue
219		}
220
221		func convertToType(rt reflect.Type, val interface{}) (interface{}, error) {
222	1	switch rt.Kind() {
223		case reflect.Interface:
224		return val, nil
225		case reflect.Ptr:
226		return convertToType(rt.Elem(), val)
227		default:
228	1	return convertToKind(rt.Kind(), val)
229		}
230		}
231
232		func convertToKind(rk reflect.Kind, v interface{}) (interface{}, error) {
233	1	switch rk {
234		case reflect.Int:
235	1	return conv.Int(v)
236		case reflect.Int8:
237	1	return conv.Int8(v)
238		case reflect.Int16:
239	1	return conv.Int16(v)
240		case reflect.Int32:
241	1	return conv.Int32(v)
242		case reflect.Int64:
243	1	return conv.Int64(v)
244		case reflect.Uint:
245		return conv.Uint(v)
246		case reflect.Uint8:
247	1	return conv.Uint8(v)
248		case reflect.Uint16:
249	1	return conv.Uint16(v)
250		case reflect.Uint32:
251	1	return conv.Uint32(v)
252		case reflect.Uint64:
253		return conv.Uint64(v)
254		case reflect.Bool:
255		return conv.Bool(v)
256		case reflect.String:
257	1	return conv.String(v)
258		}
259
260	1	return v, nil
261		}
262

et-nik / binngo

decode.decodeItem F last analyzed 2025-11-03 19:42 UTC

Complexity

Size

Duplication

Code Coverage

Importance

How to fix Long Method Complexity

Long Method

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decode.decodeItem F
last analyzed 2025-11-03 19:42 UTC