Joey Armstrong | e8c091f | 2023-01-17 16:56:26 -0500 | [diff] [blame] | 1 | package proto |
| 2 | |
| 3 | import ( |
| 4 | "encoding" |
| 5 | "fmt" |
| 6 | "reflect" |
| 7 | "time" |
| 8 | |
| 9 | "github.com/go-redis/redis/v8/internal/util" |
| 10 | ) |
| 11 | |
| 12 | // Scan parses bytes `b` to `v` with appropriate type. |
| 13 | // nolint: gocyclo |
| 14 | func Scan(b []byte, v interface{}) error { |
| 15 | switch v := v.(type) { |
| 16 | case nil: |
| 17 | return fmt.Errorf("redis: Scan(nil)") |
| 18 | case *string: |
| 19 | *v = util.BytesToString(b) |
| 20 | return nil |
| 21 | case *[]byte: |
| 22 | *v = b |
| 23 | return nil |
| 24 | case *int: |
| 25 | var err error |
| 26 | *v, err = util.Atoi(b) |
| 27 | return err |
| 28 | case *int8: |
| 29 | n, err := util.ParseInt(b, 10, 8) |
| 30 | if err != nil { |
| 31 | return err |
| 32 | } |
| 33 | *v = int8(n) |
| 34 | return nil |
| 35 | case *int16: |
| 36 | n, err := util.ParseInt(b, 10, 16) |
| 37 | if err != nil { |
| 38 | return err |
| 39 | } |
| 40 | *v = int16(n) |
| 41 | return nil |
| 42 | case *int32: |
| 43 | n, err := util.ParseInt(b, 10, 32) |
| 44 | if err != nil { |
| 45 | return err |
| 46 | } |
| 47 | *v = int32(n) |
| 48 | return nil |
| 49 | case *int64: |
| 50 | n, err := util.ParseInt(b, 10, 64) |
| 51 | if err != nil { |
| 52 | return err |
| 53 | } |
| 54 | *v = n |
| 55 | return nil |
| 56 | case *uint: |
| 57 | n, err := util.ParseUint(b, 10, 64) |
| 58 | if err != nil { |
| 59 | return err |
| 60 | } |
| 61 | *v = uint(n) |
| 62 | return nil |
| 63 | case *uint8: |
| 64 | n, err := util.ParseUint(b, 10, 8) |
| 65 | if err != nil { |
| 66 | return err |
| 67 | } |
| 68 | *v = uint8(n) |
| 69 | return nil |
| 70 | case *uint16: |
| 71 | n, err := util.ParseUint(b, 10, 16) |
| 72 | if err != nil { |
| 73 | return err |
| 74 | } |
| 75 | *v = uint16(n) |
| 76 | return nil |
| 77 | case *uint32: |
| 78 | n, err := util.ParseUint(b, 10, 32) |
| 79 | if err != nil { |
| 80 | return err |
| 81 | } |
| 82 | *v = uint32(n) |
| 83 | return nil |
| 84 | case *uint64: |
| 85 | n, err := util.ParseUint(b, 10, 64) |
| 86 | if err != nil { |
| 87 | return err |
| 88 | } |
| 89 | *v = n |
| 90 | return nil |
| 91 | case *float32: |
| 92 | n, err := util.ParseFloat(b, 32) |
| 93 | if err != nil { |
| 94 | return err |
| 95 | } |
| 96 | *v = float32(n) |
| 97 | return err |
| 98 | case *float64: |
| 99 | var err error |
| 100 | *v, err = util.ParseFloat(b, 64) |
| 101 | return err |
| 102 | case *bool: |
| 103 | *v = len(b) == 1 && b[0] == '1' |
| 104 | return nil |
| 105 | case *time.Time: |
| 106 | var err error |
| 107 | *v, err = time.Parse(time.RFC3339Nano, util.BytesToString(b)) |
| 108 | return err |
| 109 | case encoding.BinaryUnmarshaler: |
| 110 | return v.UnmarshalBinary(b) |
| 111 | default: |
| 112 | return fmt.Errorf( |
| 113 | "redis: can't unmarshal %T (consider implementing BinaryUnmarshaler)", v) |
| 114 | } |
| 115 | } |
| 116 | |
| 117 | func ScanSlice(data []string, slice interface{}) error { |
| 118 | v := reflect.ValueOf(slice) |
| 119 | if !v.IsValid() { |
| 120 | return fmt.Errorf("redis: ScanSlice(nil)") |
| 121 | } |
| 122 | if v.Kind() != reflect.Ptr { |
| 123 | return fmt.Errorf("redis: ScanSlice(non-pointer %T)", slice) |
| 124 | } |
| 125 | v = v.Elem() |
| 126 | if v.Kind() != reflect.Slice { |
| 127 | return fmt.Errorf("redis: ScanSlice(non-slice %T)", slice) |
| 128 | } |
| 129 | |
| 130 | next := makeSliceNextElemFunc(v) |
| 131 | for i, s := range data { |
| 132 | elem := next() |
| 133 | if err := Scan([]byte(s), elem.Addr().Interface()); err != nil { |
| 134 | err = fmt.Errorf("redis: ScanSlice index=%d value=%q failed: %s", i, s, err) |
| 135 | return err |
| 136 | } |
| 137 | } |
| 138 | |
| 139 | return nil |
| 140 | } |
| 141 | |
| 142 | func makeSliceNextElemFunc(v reflect.Value) func() reflect.Value { |
| 143 | elemType := v.Type().Elem() |
| 144 | |
| 145 | if elemType.Kind() == reflect.Ptr { |
| 146 | elemType = elemType.Elem() |
| 147 | return func() reflect.Value { |
| 148 | if v.Len() < v.Cap() { |
| 149 | v.Set(v.Slice(0, v.Len()+1)) |
| 150 | elem := v.Index(v.Len() - 1) |
| 151 | if elem.IsNil() { |
| 152 | elem.Set(reflect.New(elemType)) |
| 153 | } |
| 154 | return elem.Elem() |
| 155 | } |
| 156 | |
| 157 | elem := reflect.New(elemType) |
| 158 | v.Set(reflect.Append(v, elem)) |
| 159 | return elem.Elem() |
| 160 | } |
| 161 | } |
| 162 | |
| 163 | zero := reflect.Zero(elemType) |
| 164 | return func() reflect.Value { |
| 165 | if v.Len() < v.Cap() { |
| 166 | v.Set(v.Slice(0, v.Len()+1)) |
| 167 | return v.Index(v.Len() - 1) |
| 168 | } |
| 169 | |
| 170 | v.Set(reflect.Append(v, zero)) |
| 171 | return v.Index(v.Len() - 1) |
| 172 | } |
| 173 | } |