decode.newTypeDecoder - Code Metrics - Inspection of "Rename files to snake_case" - et-nik/binngo - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Push — master ( 7f55c1...cbd69a )

by Nikita

created 2021-05-25 16:21 UTC

decode.newTypeDecoder B

↳ Parent: decode/decode.go

Complexity

Conditions

Size

Total Lines	16
Code Lines	13

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	8
CRAP Score	6

Importance

Changes

Metric	Value
cc	6
eloc	13
dl	0
loc	16
c	0
b	0
f	0
ccs	8
cts	8
cp	1
crap	6
rs	8.6666
nop	1

package decode

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

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

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)
	if rv.Kind() != reflect.Ptr || rv.IsNil() {
		return &InvalidUnmarshalError{reflect.TypeOf(v)}
	}

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

	err = decodeStorage(containerType, reader, 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)
}

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

et-nik / binngo

Push — master ( 7f55c1...cbd69a )

decode.newTypeDecoder B

Complexity

Size

Duplication

Code Coverage

Importance

Duplication Side-by-Side

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