|
| 1 | +package tarantool_test |
| 2 | + |
| 3 | +import ( |
| 4 | + "fmt" |
| 5 | + "github.com/tarantool/go-tarantool" |
| 6 | + "gopkg.in/vmihailenco/msgpack.v2" |
| 7 | + "log" |
| 8 | + "time" |
| 9 | +) |
| 10 | + |
| 11 | +type Twin struct { |
| 12 | + Name string |
| 13 | + Nonce string |
| 14 | + Val uint |
| 15 | +} |
| 16 | + |
| 17 | +type TweedledeeTuple struct { |
| 18 | + Cid uint |
| 19 | + Orig string |
| 20 | + Members []Twin |
| 21 | +} |
| 22 | + |
| 23 | +/* Same effect in a "magic" way, but slower */ |
| 24 | +type TweedledumTuple struct { |
| 25 | + _msgpack struct{} `msgpack:",asArray"` |
| 26 | + |
| 27 | + Cid uint |
| 28 | + Orig string |
| 29 | + Members []Twin |
| 30 | +} |
| 31 | + |
| 32 | +func (m *Twin) EncodeMsgpack(e *msgpack.Encoder) error { |
| 33 | + if err := e.EncodeSliceLen(2); err != nil { |
| 34 | + return err |
| 35 | + } |
| 36 | + if err := e.EncodeString(m.Name); err != nil { |
| 37 | + return err |
| 38 | + } |
| 39 | + if err := e.EncodeUint(m.Val); err != nil { |
| 40 | + return err |
| 41 | + } |
| 42 | + return nil |
| 43 | +} |
| 44 | + |
| 45 | +func (m *Twin) DecodeMsgpack(d *msgpack.Decoder) error { |
| 46 | + var err error |
| 47 | + var l int |
| 48 | + if l, err = d.DecodeSliceLen(); err != nil { |
| 49 | + return err |
| 50 | + } |
| 51 | + if l != 2 { |
| 52 | + return fmt.Errorf("array len doesn't match: %d", l) |
| 53 | + } |
| 54 | + if m.Name, err = d.DecodeString(); err != nil { |
| 55 | + return err |
| 56 | + } |
| 57 | + if m.Val, err = d.DecodeUint(); err != nil { |
| 58 | + return err |
| 59 | + } |
| 60 | + return nil |
| 61 | +} |
| 62 | + |
| 63 | +func (c *TweedledeeTuple) EncodeMsgpack(e *msgpack.Encoder) error { |
| 64 | + if err := e.EncodeSliceLen(3); err != nil { |
| 65 | + return err |
| 66 | + } |
| 67 | + if err := e.EncodeUint(c.Cid); err != nil { |
| 68 | + return err |
| 69 | + } |
| 70 | + if err := e.EncodeString(c.Orig); err != nil { |
| 71 | + return err |
| 72 | + } |
| 73 | + if err := e.EncodeSliceLen(len(c.Members)); err != nil { |
| 74 | + return err |
| 75 | + } |
| 76 | + for _, m := range c.Members { |
| 77 | + e.Encode(m) |
| 78 | + } |
| 79 | + return nil |
| 80 | +} |
| 81 | + |
| 82 | +func (c *TweedledeeTuple) DecodeMsgpack(d *msgpack.Decoder) error { |
| 83 | + var err error |
| 84 | + var l int |
| 85 | + if l, err = d.DecodeSliceLen(); err != nil { |
| 86 | + return err |
| 87 | + } |
| 88 | + if l != 3 { |
| 89 | + return fmt.Errorf("array len doesn't match: %d", l) |
| 90 | + } |
| 91 | + if c.Cid, err = d.DecodeUint(); err != nil { |
| 92 | + return err |
| 93 | + } |
| 94 | + if c.Orig, err = d.DecodeString(); err != nil { |
| 95 | + return err |
| 96 | + } |
| 97 | + if l, err = d.DecodeSliceLen(); err != nil { |
| 98 | + return err |
| 99 | + } |
| 100 | + c.Members = make([]Twin, l) |
| 101 | + for i := 0; i < l; i++ { |
| 102 | + d.Decode(&c.Members[i]) |
| 103 | + } |
| 104 | + return nil |
| 105 | +} |
| 106 | + |
| 107 | +// Custom (un)packing and typed selects and function calls |
| 108 | +// |
| 109 | +// You can specify custom pack/unpack functions for your types. This will allow |
| 110 | +// you to store complex structures inside a tuple and may speed up you requests. |
| 111 | +// |
| 112 | +// Alternatively, you can just instruct the `msgpack` library to encode your |
| 113 | +// structure as an array. This is safe "magic". It will be easier to implement than |
| 114 | +// a custom packer/unpacker, but it will work slower. |
| 115 | +func Example_customUnpacking() { |
| 116 | + // Establish connection ... |
| 117 | + server := "127.0.0.1:3013" |
| 118 | + opts := tarantool.Opts{ |
| 119 | + Timeout: 500 * time.Millisecond, |
| 120 | + Reconnect: 1 * time.Second, |
| 121 | + MaxReconnects: 3, |
| 122 | + User: "test", |
| 123 | + Pass: "test", |
| 124 | + } |
| 125 | + conn, err := tarantool.Connect(server, opts) |
| 126 | + if err != nil { |
| 127 | + log.Fatalf("Failed to connect: %s", err.Error()) |
| 128 | + } |
| 129 | + |
| 130 | + spaceNo := uint32(524) |
| 131 | + indexNo := uint32(0) |
| 132 | + |
| 133 | + tuple := TweedledeeTuple{777, "orig", []Twin{{"lol", "", 1}, {"wut", "", 3}}} |
| 134 | + _, err = conn.Replace(spaceNo, tuple) // NOTE: insert structure itself |
| 135 | + if err != nil { |
| 136 | + log.Fatalf("Failed to insert: %s", err.Error()) |
| 137 | + return |
| 138 | + } |
| 139 | + |
| 140 | + var tuples []TweedledeeTuple |
| 141 | + err = conn.SelectTyped(spaceNo, indexNo, 0, 1, tarantool.IterEq, []interface{}{777}, &tuples) |
| 142 | + if err != nil { |
| 143 | + log.Fatalf("Failed to SelectTyped: %s", err.Error()) |
| 144 | + return |
| 145 | + } |
| 146 | + |
| 147 | + // Same result in a "magic" way |
| 148 | + var tuples2 []TweedledumTuple |
| 149 | + err = conn.SelectTyped(spaceNo, indexNo, 0, 1, tarantool.IterEq, []interface{}{777}, &tuples2) |
| 150 | + if err != nil { |
| 151 | + log.Fatalf("Failed to SelectTyped: %s", err.Error()) |
| 152 | + return |
| 153 | + } |
| 154 | + |
| 155 | + // Call function 'func_name' returning a table of custom tuples |
| 156 | + var tuples3 []TweedledeeTuple |
| 157 | + err = conn.CallTyped("func_name", []interface{}{1, 2, 3}, &tuples3) |
| 158 | + if err != nil { |
| 159 | + log.Fatalf("Failed to CallTyped: %s", err.Error()) |
| 160 | + return |
| 161 | + } |
| 162 | +} |
| 163 | + |
| 164 | +/* |
| 165 | +// Old way to register types |
| 166 | +func init() { |
| 167 | + msgpack.Register(reflect.TypeOf(TweedledeeTuple{}), encodeTuple, decodeTuple) |
| 168 | + msgpack.Register(reflect.TypeOf(Twin{}), encodeMember, decodeMember) |
| 169 | +} |
| 170 | +
|
| 171 | +func encodeMember(e *msgpack.Encoder, v reflect.Value) error { |
| 172 | + m := v.Interface().(Twin) |
| 173 | + // same code as in EncodeMsgpack |
| 174 | + return nil |
| 175 | +} |
| 176 | +
|
| 177 | +func decodeMember(d *msgpack.Decoder, v reflect.Value) error { |
| 178 | + m := v.Addr().Interface().(*Twin) |
| 179 | + // same code as in DecodeMsgpack |
| 180 | + return nil |
| 181 | +} |
| 182 | +
|
| 183 | +func encodeTuple(e *msgpack.Encoder, v reflect.Value) error { |
| 184 | + c := v.Interface().(TweedledeeTuple) |
| 185 | + // same code as in EncodeMsgpack |
| 186 | + return nil |
| 187 | +} |
| 188 | +
|
| 189 | +func decodeTuple(d *msgpack.Decoder, v reflect.Value) error { |
| 190 | + c := v.Addr().Interface().(*TweedledeeTuple) |
| 191 | + // same code as in DecodeMsgpack |
| 192 | + return nil |
| 193 | +} |
| 194 | +*/ |
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