├── README.md ├── const.go ├── string.go ├── hash.go ├── main.go ├── key.go └── LICENSE /README.md: -------------------------------------------------------------------------------- 1 | # redis-tikv-example 2 | A very simple example to show how to build a Redis Compatibility Cluster based on TiKV 3 | -------------------------------------------------------------------------------- /const.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | // Key Type 4 | const ( 5 | String uint8 = iota + 1 6 | HashMeta 7 | HashField 8 | ) 9 | 10 | const OK = "OK" 11 | -------------------------------------------------------------------------------- /string.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "context" 5 | 6 | "github.com/juju/errors" 7 | "github.com/pingcap/tidb/kv" 8 | ) 9 | 10 | func HandleSet(db kv.Storage, key []byte, value []byte) (interface{}, error) { 11 | txn, err := db.Begin() 12 | if err != nil { 13 | return nil, err 14 | } 15 | defer txn.Rollback() 16 | 17 | it, err := SeekPrefix(txn, key) 18 | if err != nil { 19 | return nil, err 20 | } 21 | 22 | if it != nil { 23 | defer it.Close() 24 | if tp := GetKeyType(it.Key()); tp != String { 25 | return nil, errors.Errorf("invalid type, need %d, but got %d", String, tp) 26 | } 27 | } 28 | 29 | if err := txn.Set(EncodeStringKey(nil, key), value); err != nil { 30 | return nil, err 31 | } 32 | 33 | if err := txn.Commit(context.TODO()); err != nil { 34 | return nil, err 35 | } 36 | 37 | return OK, nil 38 | } 39 | 40 | func HandleGet(db kv.Storage, key []byte) (interface{}, error) { 41 | txn, err := db.Begin() 42 | if err != nil { 43 | return nil, err 44 | } 45 | defer txn.Rollback() 46 | 47 | it, err := SeekPrefix(txn, key) 48 | if err != nil || it == nil { 49 | return nil, err 50 | } 51 | defer it.Close() 52 | 53 | if tp := GetKeyType(it.Key()); tp != String { 54 | return nil, errors.Errorf("invalid type, need %d, but got %d", String, tp) 55 | } 56 | 57 | value := append([]byte(nil), it.Value()...) 58 | 59 | if err := txn.Commit(context.TODO()); err != nil { 60 | return nil, nil 61 | } 62 | 63 | return value, nil 64 | } 65 | -------------------------------------------------------------------------------- /hash.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "context" 5 | "strconv" 6 | 7 | "github.com/juju/errors" 8 | "github.com/pingcap/tidb/kv" 9 | ) 10 | 11 | func HandleHashSet(db kv.Storage, key []byte, field []byte, value []byte) (interface{}, error) { 12 | txn, err := db.Begin() 13 | if err != nil { 14 | return nil, err 15 | } 16 | defer txn.Rollback() 17 | 18 | it, err := SeekPrefix(txn, key) 19 | if err != nil { 20 | return nil, err 21 | } 22 | 23 | num := int64(1) 24 | fieldKey := EncodeHashField(nil, key, field) 25 | metaKey := EncodeHashMetaKey(nil, key) 26 | 27 | if it != nil { 28 | defer it.Close() 29 | 30 | if tp := GetKeyType(it.Key()); tp != HashMeta { 31 | return nil, errors.Errorf("invalid type, need %d, but got %d", String, tp) 32 | } 33 | 34 | num, err = strconv.ParseInt(string(it.Value()), 10, 64) 35 | if err != nil { 36 | return nil, err 37 | } 38 | 39 | value, err := txn.Get(fieldKey) 40 | if err != nil && !kv.ErrNotExist.Equal(err) { 41 | return nil, err 42 | } 43 | 44 | if value == nil { 45 | num++ 46 | } 47 | } 48 | 49 | if err := txn.Set(metaKey, []byte(strconv.FormatInt(num, 10))); err != nil { 50 | return nil, err 51 | } 52 | 53 | if err := txn.Set(fieldKey, value); err != nil { 54 | return nil, err 55 | } 56 | 57 | if err := txn.Commit(context.TODO()); err != nil { 58 | return nil, err 59 | } 60 | 61 | return num, nil 62 | } 63 | 64 | func HandleHashGet(db kv.Storage, key []byte, field []byte) (interface{}, error) { 65 | txn, err := db.Begin() 66 | if err != nil { 67 | return nil, err 68 | } 69 | defer txn.Rollback() 70 | 71 | it, err := SeekPrefix(txn, key) 72 | if err != nil || it == nil { 73 | return nil, err 74 | } 75 | defer it.Close() 76 | 77 | if tp := GetKeyType(it.Key()); tp != HashMeta { 78 | return nil, errors.Errorf("invalid type, need %d, but got %d", String, tp) 79 | } 80 | 81 | value, err := txn.Get(EncodeHashField(nil, key, field)) 82 | if err != nil { 83 | return nil, err 84 | } 85 | 86 | if err := txn.Commit(context.TODO()); err != nil { 87 | return nil, nil 88 | } 89 | 90 | return append([]byte(nil), value...), nil 91 | } 92 | -------------------------------------------------------------------------------- /main.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "bufio" 5 | "flag" 6 | "fmt" 7 | "net" 8 | "os" 9 | "strings" 10 | 11 | "github.com/pingcap/tidb/kv" 12 | "github.com/pingcap/tidb/store/tikv" 13 | "github.com/siddontang/goredis" 14 | ) 15 | 16 | var ( 17 | pdAddr = flag.String("pd", "127.0.0.1:2379", "PD endpoints") 18 | addr = flag.String("addr", "127.0.0.1:6380", "Listening address") 19 | ) 20 | 21 | func perror(err error) { 22 | if err == nil { 23 | return 24 | } 25 | 26 | println(err.Error()) 27 | os.Exit(1) 28 | } 29 | 30 | func main() { 31 | flag.Parse() 32 | 33 | ln, err := net.Listen("tcp", *addr) 34 | perror(err) 35 | 36 | tikv.MaxConnectionCount = 128 37 | driver := tikv.Driver{} 38 | db, err := driver.Open(fmt.Sprintf("tikv://%s?disableGC=true", *pdAddr)) 39 | perror(err) 40 | defer db.Close() 41 | 42 | for { 43 | conn, err := ln.Accept() 44 | perror(err) 45 | 46 | go handleConn(db, conn) 47 | } 48 | } 49 | 50 | func handleConn(db kv.Storage, conn net.Conn) { 51 | defer conn.Close() 52 | 53 | br := bufio.NewReaderSize(conn, 4096) 54 | bw := bufio.NewWriterSize(conn, 4096) 55 | r := goredis.NewRespReader(br) 56 | w := goredis.NewRespWriter(bw) 57 | 58 | for { 59 | reqs, err := r.ParseRequest() 60 | if len(reqs) == 0 { 61 | continue 62 | } 63 | 64 | if err != nil { 65 | fmt.Printf("invalid request %v, close conn", err) 66 | return 67 | } 68 | resp, err := handleRequest(db, string(reqs[0]), reqs[1:]) 69 | 70 | if err != nil { 71 | w.FlushError(err) 72 | continue 73 | } 74 | 75 | switch v := resp.(type) { 76 | case []interface{}: 77 | w.FlushArray(v) 78 | case []byte: 79 | w.FlushBulk(v) 80 | case string: 81 | w.FlushString(v) 82 | case nil: 83 | w.FlushBulk(nil) 84 | case int64: 85 | w.FlushInteger(v) 86 | default: 87 | perror(fmt.Errorf("invalid type %T", v)) 88 | } 89 | } 90 | } 91 | 92 | func handleRequest(db kv.Storage, cmd string, args [][]byte) (interface{}, error) { 93 | switch strings.ToLower(cmd) { 94 | case "set": 95 | return HandleSet(db, args[0], args[1]) 96 | case "get": 97 | return HandleGet(db, args[0]) 98 | case "del": 99 | return HandleDelete(db, args[0]) 100 | case "hset": 101 | return HandleHashSet(db, args[0], args[1], args[2]) 102 | case "hget": 103 | return HandleHashGet(db, args[0], args[1]) 104 | default: 105 | return nil, fmt.Errorf("%s is not supported", cmd) 106 | } 107 | return nil, nil 108 | } 109 | -------------------------------------------------------------------------------- /key.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "context" 5 | "encoding/binary" 6 | 7 | "github.com/juju/errors" 8 | "github.com/pingcap/tidb/kv" 9 | ) 10 | 11 | var ( 12 | emptyBytes = make([]byte, 0) 13 | paddingZeros = make([]byte, 9) 14 | errCorruptedData = errors.New("Failed to decode corrupted data") 15 | ) 16 | 17 | const ( 18 | rdbEscapeLength = 9 19 | signMask = 0x8000000000000000 20 | ) 21 | 22 | func rdbEncodedSize(len int) int { 23 | return (1 + ((len + (rdbEscapeLength - 2)) / (rdbEscapeLength - 1))) * rdbEscapeLength 24 | } 25 | 26 | func ensureCapacity(from []byte, extra int) []byte { 27 | newSize := len(from) + extra 28 | if cap(from) < newSize { 29 | to := make([]byte, len(from), newSize) 30 | copy(to, from) 31 | return to 32 | } 33 | return from 34 | } 35 | 36 | // EncodeBytes encodes the slice to buffer with mem-comparable format from myrocks 37 | func EncodeBytes(buffer []byte, src []byte) []byte { 38 | buffer = ensureCapacity(buffer, rdbEncodedSize(len(src))) 39 | for { 40 | // Figure out how many bytes to copy, copy them and adjust pointers 41 | var copyLen int 42 | srcLen := len(src) 43 | if rdbEscapeLength-1 < srcLen { 44 | copyLen = rdbEscapeLength - 1 45 | } else { 46 | copyLen = srcLen 47 | } 48 | buffer = append(buffer, src[0:copyLen]...) 49 | src = src[copyLen:] 50 | 51 | // Are we at the end of the input? 52 | if len(src) == 0 { 53 | // pad with zeros if necessary; 54 | paddingBytes := rdbEscapeLength - 1 - copyLen 55 | if paddingBytes > 0 { 56 | buffer = append(buffer, paddingZeros[0:paddingBytes]...) 57 | } 58 | 59 | // Put the flag byte (0 - N-1) in the output 60 | buffer = append(buffer, byte(copyLen)) 61 | break 62 | } 63 | 64 | // We have more data - put the flag byte (N) in and continue 65 | buffer = append(buffer, rdbEscapeLength) 66 | } 67 | 68 | return buffer 69 | } 70 | 71 | // DecodeBytes decodes the slice, return the left buffer, decoded slice or error 72 | func DecodeBytes(from []byte) ([]byte, []byte, error) { 73 | data := make([]byte, 0, len(from)) 74 | for { 75 | if len(from) < rdbEscapeLength { 76 | return nil, nil, errors.New("insufficient bytes to decode value") 77 | } 78 | 79 | groupBytes := from[:rdbEscapeLength] 80 | group := groupBytes[:rdbEscapeLength-1] 81 | realGroupSize := groupBytes[rdbEscapeLength-1] 82 | if realGroupSize > rdbEscapeLength { 83 | return nil, nil, errors.Errorf("invalid flag byte, group bytes %q", groupBytes) 84 | } 85 | 86 | from = from[rdbEscapeLength:] 87 | 88 | if realGroupSize < rdbEscapeLength { 89 | // Check validity of padding bytes. 90 | for _, v := range group[realGroupSize:] { 91 | if v != 0 { 92 | return nil, nil, errors.Errorf("invalid padding byte, group bytes %q", groupBytes) 93 | } 94 | } 95 | data = append(data, group[:realGroupSize]...) 96 | break 97 | } else { 98 | data = append(data, group[:rdbEscapeLength-1]...) 99 | } 100 | } 101 | return from, data, nil 102 | } 103 | 104 | // EncodeInt64 encodes the int64 to buffer with mem-comparable format. 105 | func EncodeInt64(buffer []byte, i int64) []byte { 106 | var data [8]byte 107 | u := uint64(i) ^ signMask 108 | binary.BigEndian.PutUint64(data[:], u) 109 | return append(buffer, data[:]...) 110 | } 111 | 112 | // DecodeInt64 decodes the int64, return the left buffer, decoded int64 or error. 113 | func DecodeInt64(from []byte) ([]byte, int64, error) { 114 | if len(from) < 8 { 115 | return nil, 0, errCorruptedData 116 | } 117 | u := binary.BigEndian.Uint64(from[:8]) 118 | return from[8:], int64(u ^ signMask), nil 119 | } 120 | 121 | func GetKeyType(key []byte) uint8 { 122 | return key[len(key)-1] 123 | } 124 | 125 | func EncodeStringKey(buf []byte, key []byte) []byte { 126 | key = EncodeBytes(buf, key) 127 | buf = append(buf, key...) 128 | buf = append(buf, String) 129 | return buf 130 | } 131 | 132 | func EncodeHashMetaKey(buf []byte, key []byte) []byte { 133 | key = EncodeBytes(buf, key) 134 | buf = append(buf, key...) 135 | buf = append(buf, HashMeta) 136 | return buf 137 | } 138 | 139 | func EncodeHashField(buf []byte, key []byte, field []byte) []byte { 140 | key = EncodeBytes(buf, key) 141 | buf = append(buf, key...) 142 | buf = append(buf, HashField) 143 | field = EncodeBytes(buf, field) 144 | buf = append(buf, field...) 145 | return buf 146 | } 147 | 148 | func HandleDelete(db kv.Storage, key []byte) (interface{}, error) { 149 | txn, err := db.Begin() 150 | if err != nil { 151 | return nil, err 152 | } 153 | defer txn.Rollback() 154 | 155 | prefixKey := EncodeBytes(nil, key) 156 | it, err := txn.Seek(prefixKey) 157 | if err != nil { 158 | return nil, err 159 | } 160 | defer it.Close() 161 | 162 | var keys [][]byte 163 | for it.Valid() && it.Key().HasPrefix(prefixKey) { 164 | keys = append(keys, it.Key().Clone()) 165 | if err := it.Next(); err != nil { 166 | return nil, err 167 | } 168 | } 169 | 170 | hasKey := int64(0) 171 | for _, key := range keys { 172 | hasKey = 1 173 | if err := txn.Delete(key); err != nil { 174 | return nil, err 175 | } 176 | } 177 | 178 | if err := txn.Commit(context.TODO()); err != nil { 179 | return nil, err 180 | } 181 | 182 | return hasKey, nil 183 | } 184 | 185 | func SeekPrefix(txn kv.Transaction, key []byte) (kv.Iterator, error) { 186 | seekKey := EncodeBytes(nil, key) 187 | it, err := txn.Seek(seekKey) 188 | if err != nil { 189 | return nil, err 190 | } 191 | 192 | if !it.Valid() { 193 | it.Close() 194 | return nil, nil 195 | } 196 | 197 | if !it.Key().HasPrefix(key) { 198 | it.Close() 199 | return nil, nil 200 | } 201 | 202 | return it, nil 203 | } 204 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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