160 lines
7.0 KiB
C
160 lines
7.0 KiB
C
/*
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* Copyright (c) 2009-2012, Salvatore Sanfilippo <antirez at gmail dot com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Redis nor the names of its contributors may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __RDB_H
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#define __RDB_H
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#include <stdio.h>
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#include "rio.h"
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/* TBD: include only necessary headers. */
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#include "server.h"
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/* The current RDB version. When the format changes in a way that is no longer
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* backward compatible this number gets incremented. */
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#define RDB_VERSION 9
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/* Defines related to the dump file format. To store 32 bits lengths for short
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* keys requires a lot of space, so we check the most significant 2 bits of
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* the first byte to interpreter the length:
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*
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* 00|XXXXXX => if the two MSB are 00 the len is the 6 bits of this byte
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* 01|XXXXXX XXXXXXXX => 01, the len is 14 byes, 6 bits + 8 bits of next byte
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* 10|000000 [32 bit integer] => A full 32 bit len in net byte order will follow
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* 10|000001 [64 bit integer] => A full 64 bit len in net byte order will follow
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* 11|OBKIND this means: specially encoded object will follow. The six bits
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* number specify the kind of object that follows.
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* See the RDB_ENC_* defines.
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*
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* Lengths up to 63 are stored using a single byte, most DB keys, and may
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* values, will fit inside. */
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#define RDB_6BITLEN 0
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#define RDB_14BITLEN 1
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#define RDB_32BITLEN 0x80
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#define RDB_64BITLEN 0x81
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#define RDB_ENCVAL 3
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#define RDB_LENERR UINT64_MAX
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/* When a length of a string object stored on disk has the first two bits
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* set, the remaining six bits specify a special encoding for the object
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* accordingly to the following defines: */
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#define RDB_ENC_INT8 0 /* 8 bit signed integer */
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#define RDB_ENC_INT16 1 /* 16 bit signed integer */
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#define RDB_ENC_INT32 2 /* 32 bit signed integer */
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#define RDB_ENC_LZF 3 /* string compressed with FASTLZ */
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/* Map object types to RDB object types. Macros starting with OBJ_ are for
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* memory storage and may change. Instead RDB types must be fixed because
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* we store them on disk. */
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#define RDB_TYPE_STRING 0
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#define RDB_TYPE_LIST 1
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#define RDB_TYPE_SET 2
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#define RDB_TYPE_ZSET 3
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#define RDB_TYPE_HASH 4
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#define RDB_TYPE_ZSET_2 5 /* ZSET version 2 with doubles stored in binary. */
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#define RDB_TYPE_MODULE 6
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#define RDB_TYPE_MODULE_2 7 /* Module value with annotations for parsing without
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the generating module being loaded. */
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/* NOTE: WHEN ADDING NEW RDB TYPE, UPDATE rdbIsObjectType() BELOW */
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/* Object types for encoded objects. */
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#define RDB_TYPE_HASH_ZIPMAP 9
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#define RDB_TYPE_LIST_ZIPLIST 10
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#define RDB_TYPE_SET_INTSET 11
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#define RDB_TYPE_ZSET_ZIPLIST 12
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#define RDB_TYPE_HASH_ZIPLIST 13
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#define RDB_TYPE_LIST_QUICKLIST 14
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#define RDB_TYPE_STREAM_LISTPACKS 15
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/* NOTE: WHEN ADDING NEW RDB TYPE, UPDATE rdbIsObjectType() BELOW */
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/* Test if a type is an object type. */
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#define rdbIsObjectType(t) ((t >= 0 && t <= 7) || (t >= 9 && t <= 15))
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/* Special RDB opcodes (saved/loaded with rdbSaveType/rdbLoadType). */
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#define RDB_OPCODE_MODULE_AUX 247 /* Module auxiliary data. */
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#define RDB_OPCODE_IDLE 248 /* LRU idle time. */
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#define RDB_OPCODE_FREQ 249 /* LFU frequency. */
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#define RDB_OPCODE_AUX 250 /* RDB aux field. */
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#define RDB_OPCODE_RESIZEDB 251 /* Hash table resize hint. */
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#define RDB_OPCODE_EXPIRETIME_MS 252 /* Expire time in milliseconds. */
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#define RDB_OPCODE_EXPIRETIME 253 /* Old expire time in seconds. */
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#define RDB_OPCODE_SELECTDB 254 /* DB number of the following keys. */
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#define RDB_OPCODE_EOF 255 /* End of the RDB file. */
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/* Module serialized values sub opcodes */
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#define RDB_MODULE_OPCODE_EOF 0 /* End of module value. */
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#define RDB_MODULE_OPCODE_SINT 1 /* Signed integer. */
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#define RDB_MODULE_OPCODE_UINT 2 /* Unsigned integer. */
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#define RDB_MODULE_OPCODE_FLOAT 3 /* Float. */
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#define RDB_MODULE_OPCODE_DOUBLE 4 /* Double. */
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#define RDB_MODULE_OPCODE_STRING 5 /* String. */
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/* rdbLoad...() functions flags. */
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#define RDB_LOAD_NONE 0
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#define RDB_LOAD_ENC (1<<0)
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#define RDB_LOAD_PLAIN (1<<1)
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#define RDB_LOAD_SDS (1<<2)
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#define RDB_SAVE_NONE 0
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#define RDB_SAVE_AOF_PREAMBLE (1<<0)
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int rdbSaveType(rio *rdb, unsigned char type);
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int rdbLoadType(rio *rdb);
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int rdbSaveTime(rio *rdb, time_t t);
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int rdbLoadTime(rio *rdb, time_t *t);
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int rdbSaveLen(rio *rdb, uint64_t len);
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int rdbSaveMillisecondTime(rio *rdb, long long t);
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int rdbLoadMillisecondTime(rio *rdb, long long *t, int rdbver);
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uint64_t rdbLoadLen(rio *rdb, int *isencoded);
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int rdbLoadLenByRef(rio *rdb, int *isencoded, uint64_t *lenptr);
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int rdbSaveObjectType(rio *rdb, robj *o);
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int rdbLoadObjectType(rio *rdb);
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int rdbLoad(char *filename, rdbSaveInfo *rsi);
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int rdbSaveBackground(char *filename, rdbSaveInfo *rsi);
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int rdbSaveToSlavesSockets(rdbSaveInfo *rsi);
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void rdbRemoveTempFile(pid_t childpid);
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int rdbSave(char *filename, rdbSaveInfo *rsi);
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ssize_t rdbSaveObject(rio *rdb, robj *o, robj *key);
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size_t rdbSavedObjectLen(robj *o);
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robj *rdbLoadObject(int type, rio *rdb, robj *key);
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void backgroundSaveDoneHandler(int exitcode, int bysignal);
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int rdbSaveKeyValuePair(rio *rdb, robj *key, robj *val, long long expiretime);
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robj *rdbLoadStringObject(rio *rdb);
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ssize_t rdbSaveStringObject(rio *rdb, robj *obj);
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ssize_t rdbSaveRawString(rio *rdb, unsigned char *s, size_t len);
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void *rdbGenericLoadStringObject(rio *rdb, int flags, size_t *lenptr);
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int rdbSaveBinaryDoubleValue(rio *rdb, double val);
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int rdbLoadBinaryDoubleValue(rio *rdb, double *val);
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int rdbSaveBinaryFloatValue(rio *rdb, float val);
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int rdbLoadBinaryFloatValue(rio *rdb, float *val);
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int rdbLoadRio(rio *rdb, rdbSaveInfo *rsi, int loading_aof);
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rdbSaveInfo *rdbPopulateSaveInfo(rdbSaveInfo *rsi);
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#endif
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