| 39 | const int kSplitSlot = 8191; |
| 40 | |
| 41 | uint16_t HashSlot(const std::string& key) { |
| 42 | // Keep this aligned with implementation in redis_cluster.cpp. |
| 43 | static const uint16_t table[256] = { |
| 44 | 0x0000,0x1021,0x2042,0x3063,0x4084,0x50A5,0x60C6,0x70E7, |
| 45 | 0x8108,0x9129,0xA14A,0xB16B,0xC18C,0xD1AD,0xE1CE,0xF1EF, |
| 46 | 0x1231,0x0210,0x3273,0x2252,0x52B5,0x4294,0x72F7,0x62D6, |
| 47 | 0x9339,0x8318,0xB37B,0xA35A,0xD3BD,0xC39C,0xF3FF,0xE3DE, |
| 48 | 0x2462,0x3443,0x0420,0x1401,0x64E6,0x74C7,0x44A4,0x5485, |
| 49 | 0xA56A,0xB54B,0x8528,0x9509,0xE5EE,0xF5CF,0xC5AC,0xD58D, |
| 50 | 0x3653,0x2672,0x1611,0x0630,0x76D7,0x66F6,0x5695,0x46B4, |
| 51 | 0xB75B,0xA77A,0x9719,0x8738,0xF7DF,0xE7FE,0xD79D,0xC7BC, |
| 52 | 0x48C4,0x58E5,0x6886,0x78A7,0x0840,0x1861,0x2802,0x3823, |
| 53 | 0xC9CC,0xD9ED,0xE98E,0xF9AF,0x8948,0x9969,0xA90A,0xB92B, |
| 54 | 0x5AF5,0x4AD4,0x7AB7,0x6A96,0x1A71,0x0A50,0x3A33,0x2A12, |
| 55 | 0xDBFD,0xCBDC,0xFBBF,0xEB9E,0x9B79,0x8B58,0xBB3B,0xAB1A, |
| 56 | 0x6CA6,0x7C87,0x4CE4,0x5CC5,0x2C22,0x3C03,0x0C60,0x1C41, |
| 57 | 0xEDAE,0xFD8F,0xCDEC,0xDDCD,0xAD2A,0xBD0B,0x8D68,0x9D49, |
| 58 | 0x7E97,0x6EB6,0x5ED5,0x4EF4,0x3E13,0x2E32,0x1E51,0x0E70, |
| 59 | 0xFF9F,0xEFBE,0xDFDD,0xCFFC,0xBF1B,0xAF3A,0x9F59,0x8F78, |
| 60 | 0x9188,0x81A9,0xB1CA,0xA1EB,0xD10C,0xC12D,0xF14E,0xE16F, |
| 61 | 0x1080,0x00A1,0x30C2,0x20E3,0x5004,0x4025,0x7046,0x6067, |
| 62 | 0x83B9,0x9398,0xA3FB,0xB3DA,0xC33D,0xD31C,0xE37F,0xF35E, |
| 63 | 0x02B1,0x1290,0x22F3,0x32D2,0x4235,0x5214,0x6277,0x7256, |
| 64 | 0xB5EA,0xA5CB,0x95A8,0x8589,0xF56E,0xE54F,0xD52C,0xC50D, |
| 65 | 0x34E2,0x24C3,0x14A0,0x0481,0x7466,0x6447,0x5424,0x4405, |
| 66 | 0xA7DB,0xB7FA,0x8799,0x97B8,0xE75F,0xF77E,0xC71D,0xD73C, |
| 67 | 0x26D3,0x36F2,0x0691,0x16B0,0x6657,0x7676,0x4615,0x5634, |
| 68 | 0xD94C,0xC96D,0xF90E,0xE92F,0x99C8,0x89E9,0xB98A,0xA9AB, |
| 69 | 0x5844,0x4865,0x7806,0x6827,0x18C0,0x08E1,0x3882,0x28A3, |
| 70 | 0xCB7D,0xDB5C,0xEB3F,0xFB1E,0x8BF9,0x9BD8,0xABBB,0xBB9A, |
| 71 | 0x4A75,0x5A54,0x6A37,0x7A16,0x0AF1,0x1AD0,0x2AB3,0x3A92, |
| 72 | 0xFD2E,0xED0F,0xDD6C,0xCD4D,0xBDAA,0xAD8B,0x9DE8,0x8DC9, |
| 73 | 0x7C26,0x6C07,0x5C64,0x4C45,0x3CA2,0x2C83,0x1CE0,0x0CC1, |
| 74 | 0xEF1F,0xFF3E,0xCF5D,0xDF7C,0xAF9B,0xBFBA,0x8FD9,0x9FF8, |
| 75 | 0x6E17,0x7E36,0x4E55,0x5E74,0x2E93,0x3EB2,0x0ED1,0x1EF0 |
| 76 | }; |
| 77 | |
| 78 | std::string hashed = key; |
| 79 | size_t begin = key.find('{'); |
| 80 | if (begin != std::string::npos) { |
| 81 | size_t end = key.find('}', begin + 1); |
| 82 | if (end != std::string::npos && end > begin + 1) { |
| 83 | hashed = key.substr(begin + 1, end - begin - 1); |
| 84 | } |
| 85 | } |
| 86 | uint16_t crc = 0; |
| 87 | for (size_t i = 0; i < hashed.size(); ++i) { |
| 88 | uint8_t idx = static_cast<uint8_t>((crc >> 8) ^ |
| 89 | static_cast<uint8_t>(hashed[i])); |
| 90 | crc = static_cast<uint16_t>((crc << 8) ^ table[idx]); |
| 91 | } |
| 92 | return crc & 16383; |
| 93 | } |
| 94 | |
| 95 | int OwnerBySlot(int slot) { |
| 96 | return slot <= kSplitSlot ? 0 : 1; |
no test coverage detected