X-Git-Url: https://git.saurik.com/redis.git/blobdiff_plain/bd70a5f5884ec46983ac32a1ae0b48f4d356a9d5..b8ce9a84c57eba13a157d7c1074254b5ce6bebd3:/src/rdb.c diff --git a/src/rdb.c b/src/rdb.c index 5e69a324..90c2ea08 100644 --- a/src/rdb.c +++ b/src/rdb.c @@ -1,5 +1,7 @@ #include "redis.h" #include "lzf.h" /* LZF compression library */ +#include "zipmap.h" +#include "endianconv.h" #include #include @@ -9,58 +11,105 @@ #include #include -/* Convenience wrapper around fwrite, that returns the number of bytes written - * to the file instead of the number of objects (see fwrite(3)) and -1 in the - * case of an error. It also supports a NULL *fp to skip writing altogether - * instead of writing to /dev/null. */ -static int rdbWriteRaw(FILE *fp, void *p, size_t len) { - if (fp != NULL && fwrite(p,len,1,fp) == 0) return -1; +static int rdbWriteRaw(rio *rdb, void *p, size_t len) { + if (rdb && rioWrite(rdb,p,len) == 0) + return -1; return len; } -int rdbSaveType(FILE *fp, unsigned char type) { - return rdbWriteRaw(fp,&type,1); +int rdbSaveType(rio *rdb, unsigned char type) { + return rdbWriteRaw(rdb,&type,1); } -int rdbSaveTime(FILE *fp, time_t t) { - int32_t t32 = (int32_t) t; - return rdbWriteRaw(fp,&t32,4); +/* Load a "type" in RDB format, that is a one byte unsigned integer. + * This function is not only used to load object types, but also special + * "types" like the end-of-file type, the EXPIRE type, and so forth. */ +int rdbLoadType(rio *rdb) { + unsigned char type; + if (rioRead(rdb,&type,1) == 0) return -1; + return type; +} + +time_t rdbLoadTime(rio *rdb) { + int32_t t32; + if (rioRead(rdb,&t32,4) == 0) return -1; + return (time_t)t32; } -/* check rdbLoadLen() comments for more info */ -int rdbSaveLen(FILE *fp, uint32_t len) { +int rdbSaveMillisecondTime(rio *rdb, long long t) { + int64_t t64 = (int64_t) t; + return rdbWriteRaw(rdb,&t64,8); +} + +long long rdbLoadMillisecondTime(rio *rdb) { + int64_t t64; + if (rioRead(rdb,&t64,8) == 0) return -1; + return (long long)t64; +} + +/* Saves an encoded length. The first two bits in the first byte are used to + * hold the encoding type. See the REDIS_RDB_* definitions for more information + * on the types of encoding. */ +int rdbSaveLen(rio *rdb, uint32_t len) { unsigned char buf[2]; - int nwritten; + size_t nwritten; if (len < (1<<6)) { /* Save a 6 bit len */ buf[0] = (len&0xFF)|(REDIS_RDB_6BITLEN<<6); - if (rdbWriteRaw(fp,buf,1) == -1) return -1; + if (rdbWriteRaw(rdb,buf,1) == -1) return -1; nwritten = 1; } else if (len < (1<<14)) { /* Save a 14 bit len */ buf[0] = ((len>>8)&0xFF)|(REDIS_RDB_14BITLEN<<6); buf[1] = len&0xFF; - if (rdbWriteRaw(fp,buf,2) == -1) return -1; + if (rdbWriteRaw(rdb,buf,2) == -1) return -1; nwritten = 2; } else { /* Save a 32 bit len */ buf[0] = (REDIS_RDB_32BITLEN<<6); - if (rdbWriteRaw(fp,buf,1) == -1) return -1; + if (rdbWriteRaw(rdb,buf,1) == -1) return -1; len = htonl(len); - if (rdbWriteRaw(fp,&len,4) == -1) return -1; + if (rdbWriteRaw(rdb,&len,4) == -4) return -1; nwritten = 1+4; } return nwritten; } -/* Encode 'value' as an integer if possible (if integer will fit the - * supported range). If the function sucessful encoded the integer - * then the (up to 5 bytes) encoded representation is written in the - * string pointed by 'enc' and the length is returned. Otherwise - * 0 is returned. */ +/* Load an encoded length. The "isencoded" argument is set to 1 if the length + * is not actually a length but an "encoding type". See the REDIS_RDB_ENC_* + * definitions in rdb.h for more information. */ +uint32_t rdbLoadLen(rio *rdb, int *isencoded) { + unsigned char buf[2]; + uint32_t len; + int type; + + if (isencoded) *isencoded = 0; + if (rioRead(rdb,buf,1) == 0) return REDIS_RDB_LENERR; + type = (buf[0]&0xC0)>>6; + if (type == REDIS_RDB_ENCVAL) { + /* Read a 6 bit encoding type. */ + if (isencoded) *isencoded = 1; + return buf[0]&0x3F; + } else if (type == REDIS_RDB_6BITLEN) { + /* Read a 6 bit len. */ + return buf[0]&0x3F; + } else if (type == REDIS_RDB_14BITLEN) { + /* Read a 14 bit len. */ + if (rioRead(rdb,buf+1,1) == 0) return REDIS_RDB_LENERR; + return ((buf[0]&0x3F)<<8)|buf[1]; + } else { + /* Read a 32 bit len. */ + if (rioRead(rdb,&len,4) == 0) return REDIS_RDB_LENERR; + return ntohl(len); + } +} + +/* Encodes the "value" argument as integer when it fits in the supported ranges + * for encoded types. If the function successfully encodes the integer, the + * representation is stored in the buffer pointer to by "enc" and the string + * length is returned. Otherwise 0 is returned. */ int rdbEncodeInteger(long long value, unsigned char *enc) { - /* Finally check if it fits in our ranges */ if (value >= -(1<<7) && value <= (1<<7)-1) { enc[0] = (REDIS_RDB_ENCVAL<<6)|REDIS_RDB_ENC_INT8; enc[1] = value&0xFF; @@ -82,6 +131,36 @@ int rdbEncodeInteger(long long value, unsigned char *enc) { } } +/* Loads an integer-encoded object with the specified encoding type "enctype". + * If the "encode" argument is set the function may return an integer-encoded + * string object, otherwise it always returns a raw string object. */ +robj *rdbLoadIntegerObject(rio *rdb, int enctype, int encode) { + unsigned char enc[4]; + long long val; + + if (enctype == REDIS_RDB_ENC_INT8) { + if (rioRead(rdb,enc,1) == 0) return NULL; + val = (signed char)enc[0]; + } else if (enctype == REDIS_RDB_ENC_INT16) { + uint16_t v; + if (rioRead(rdb,enc,2) == 0) return NULL; + v = enc[0]|(enc[1]<<8); + val = (int16_t)v; + } else if (enctype == REDIS_RDB_ENC_INT32) { + uint32_t v; + if (rioRead(rdb,enc,4) == 0) return NULL; + v = enc[0]|(enc[1]<<8)|(enc[2]<<16)|(enc[3]<<24); + val = (int32_t)v; + } else { + val = 0; /* anti-warning */ + redisPanic("Unknown RDB integer encoding type"); + } + if (encode) + return createStringObjectFromLongLong(val); + else + return createObject(REDIS_STRING,sdsfromlonglong(val)); +} + /* String objects in the form "2391" "-100" without any space and with a * range of values that can fit in an 8, 16 or 32 bit signed value can be * encoded as integers to save space */ @@ -101,7 +180,7 @@ int rdbTryIntegerEncoding(char *s, size_t len, unsigned char *enc) { return rdbEncodeInteger(value,enc); } -int rdbSaveLzfStringObject(FILE *fp, unsigned char *s, size_t len) { +int rdbSaveLzfStringObject(rio *rdb, unsigned char *s, size_t len) { size_t comprlen, outlen; unsigned char byte; int n, nwritten = 0; @@ -118,16 +197,16 @@ int rdbSaveLzfStringObject(FILE *fp, unsigned char *s, size_t len) { } /* Data compressed! Let's save it on disk */ byte = (REDIS_RDB_ENCVAL<<6)|REDIS_RDB_ENC_LZF; - if ((n = rdbWriteRaw(fp,&byte,1)) == -1) goto writeerr; + if ((n = rdbWriteRaw(rdb,&byte,1)) == -1) goto writeerr; nwritten += n; - if ((n = rdbSaveLen(fp,comprlen)) == -1) goto writeerr; + if ((n = rdbSaveLen(rdb,comprlen)) == -1) goto writeerr; nwritten += n; - if ((n = rdbSaveLen(fp,len)) == -1) goto writeerr; + if ((n = rdbSaveLen(rdb,len)) == -1) goto writeerr; nwritten += n; - if ((n = rdbWriteRaw(fp,out,comprlen)) == -1) goto writeerr; + if ((n = rdbWriteRaw(rdb,out,comprlen)) == -1) goto writeerr; nwritten += n; zfree(out); @@ -138,9 +217,28 @@ writeerr: return -1; } +robj *rdbLoadLzfStringObject(rio *rdb) { + unsigned int len, clen; + unsigned char *c = NULL; + sds val = NULL; + + if ((clen = rdbLoadLen(rdb,NULL)) == REDIS_RDB_LENERR) return NULL; + if ((len = rdbLoadLen(rdb,NULL)) == REDIS_RDB_LENERR) return NULL; + if ((c = zmalloc(clen)) == NULL) goto err; + if ((val = sdsnewlen(NULL,len)) == NULL) goto err; + if (rioRead(rdb,c,clen) == 0) goto err; + if (lzf_decompress(c,clen,val,len) == 0) goto err; + zfree(c); + return createObject(REDIS_STRING,val); +err: + zfree(c); + sdsfree(val); + return NULL; +} + /* Save a string objet as [len][data] on disk. If the object is a string - * representation of an integer value we try to safe it in a special form */ -int rdbSaveRawString(FILE *fp, unsigned char *s, size_t len) { + * representation of an integer value we try to save it in a special form */ +int rdbSaveRawString(rio *rdb, unsigned char *s, size_t len) { int enclen; int n, nwritten = 0; @@ -148,59 +246,95 @@ int rdbSaveRawString(FILE *fp, unsigned char *s, size_t len) { if (len <= 11) { unsigned char buf[5]; if ((enclen = rdbTryIntegerEncoding((char*)s,len,buf)) > 0) { - if (rdbWriteRaw(fp,buf,enclen) == -1) return -1; + if (rdbWriteRaw(rdb,buf,enclen) == -1) return -1; return enclen; } } /* Try LZF compression - under 20 bytes it's unable to compress even * aaaaaaaaaaaaaaaaaa so skip it */ - if (server.rdbcompression && len > 20) { - n = rdbSaveLzfStringObject(fp,s,len); + if (server.rdb_compression && len > 20) { + n = rdbSaveLzfStringObject(rdb,s,len); if (n == -1) return -1; if (n > 0) return n; /* Return value of 0 means data can't be compressed, save the old way */ } /* Store verbatim */ - if ((n = rdbSaveLen(fp,len)) == -1) return -1; + if ((n = rdbSaveLen(rdb,len)) == -1) return -1; nwritten += n; if (len > 0) { - if (rdbWriteRaw(fp,s,len) == -1) return -1; + if (rdbWriteRaw(rdb,s,len) == -1) return -1; nwritten += len; } return nwritten; } /* Save a long long value as either an encoded string or a string. */ -int rdbSaveLongLongAsStringObject(FILE *fp, long long value) { +int rdbSaveLongLongAsStringObject(rio *rdb, long long value) { unsigned char buf[32]; int n, nwritten = 0; int enclen = rdbEncodeInteger(value,buf); if (enclen > 0) { - return rdbWriteRaw(fp,buf,enclen); + return rdbWriteRaw(rdb,buf,enclen); } else { /* Encode as string */ enclen = ll2string((char*)buf,32,value); redisAssert(enclen < 32); - if ((n = rdbSaveLen(fp,enclen)) == -1) return -1; + if ((n = rdbSaveLen(rdb,enclen)) == -1) return -1; nwritten += n; - if ((n = rdbWriteRaw(fp,buf,enclen)) == -1) return -1; + if ((n = rdbWriteRaw(rdb,buf,enclen)) == -1) return -1; nwritten += n; } return nwritten; } /* Like rdbSaveStringObjectRaw() but handle encoded objects */ -int rdbSaveStringObject(FILE *fp, robj *obj) { +int rdbSaveStringObject(rio *rdb, robj *obj) { /* Avoid to decode the object, then encode it again, if the * object is alrady integer encoded. */ if (obj->encoding == REDIS_ENCODING_INT) { - return rdbSaveLongLongAsStringObject(fp,(long)obj->ptr); + return rdbSaveLongLongAsStringObject(rdb,(long)obj->ptr); } else { - redisAssert(obj->encoding == REDIS_ENCODING_RAW); - return rdbSaveRawString(fp,obj->ptr,sdslen(obj->ptr)); + redisAssertWithInfo(NULL,obj,obj->encoding == REDIS_ENCODING_RAW); + return rdbSaveRawString(rdb,obj->ptr,sdslen(obj->ptr)); + } +} + +robj *rdbGenericLoadStringObject(rio *rdb, int encode) { + int isencoded; + uint32_t len; + sds val; + + len = rdbLoadLen(rdb,&isencoded); + if (isencoded) { + switch(len) { + case REDIS_RDB_ENC_INT8: + case REDIS_RDB_ENC_INT16: + case REDIS_RDB_ENC_INT32: + return rdbLoadIntegerObject(rdb,len,encode); + case REDIS_RDB_ENC_LZF: + return rdbLoadLzfStringObject(rdb); + default: + redisPanic("Unknown RDB encoding type"); + } + } + + if (len == REDIS_RDB_LENERR) return NULL; + val = sdsnewlen(NULL,len); + if (len && rioRead(rdb,val,len) == 0) { + sdsfree(val); + return NULL; } + return createObject(REDIS_STRING,val); +} + +robj *rdbLoadStringObject(rio *rdb) { + return rdbGenericLoadStringObject(rdb,0); +} + +robj *rdbLoadEncodedStringObject(rio *rdb) { + return rdbGenericLoadStringObject(rdb,1); } /* Save a double value. Doubles are saved as strings prefixed by an unsigned @@ -211,7 +345,7 @@ int rdbSaveStringObject(FILE *fp, robj *obj) { * 254: + inf * 255: - inf */ -int rdbSaveDoubleValue(FILE *fp, double val) { +int rdbSaveDoubleValue(rio *rdb, double val) { unsigned char buf[128]; int len; @@ -242,53 +376,102 @@ int rdbSaveDoubleValue(FILE *fp, double val) { buf[0] = strlen((char*)buf+1); len = buf[0]+1; } - return rdbWriteRaw(fp,buf,len); + return rdbWriteRaw(rdb,buf,len); } -/* Save a Redis object. */ -int rdbSaveObject(FILE *fp, robj *o) { +/* For information about double serialization check rdbSaveDoubleValue() */ +int rdbLoadDoubleValue(rio *rdb, double *val) { + char buf[128]; + unsigned char len; + + if (rioRead(rdb,&len,1) == 0) return -1; + switch(len) { + case 255: *val = R_NegInf; return 0; + case 254: *val = R_PosInf; return 0; + case 253: *val = R_Nan; return 0; + default: + if (rioRead(rdb,buf,len) == 0) return -1; + buf[len] = '\0'; + sscanf(buf, "%lg", val); + return 0; + } +} + +/* Save the object type of object "o". */ +int rdbSaveObjectType(rio *rdb, robj *o) { + switch (o->type) { + case REDIS_STRING: + return rdbSaveType(rdb,REDIS_RDB_TYPE_STRING); + case REDIS_LIST: + if (o->encoding == REDIS_ENCODING_ZIPLIST) + return rdbSaveType(rdb,REDIS_RDB_TYPE_LIST_ZIPLIST); + else if (o->encoding == REDIS_ENCODING_LINKEDLIST) + return rdbSaveType(rdb,REDIS_RDB_TYPE_LIST); + else + redisPanic("Unknown list encoding"); + case REDIS_SET: + if (o->encoding == REDIS_ENCODING_INTSET) + return rdbSaveType(rdb,REDIS_RDB_TYPE_SET_INTSET); + else if (o->encoding == REDIS_ENCODING_HT) + return rdbSaveType(rdb,REDIS_RDB_TYPE_SET); + else + redisPanic("Unknown set encoding"); + case REDIS_ZSET: + if (o->encoding == REDIS_ENCODING_ZIPLIST) + return rdbSaveType(rdb,REDIS_RDB_TYPE_ZSET_ZIPLIST); + else if (o->encoding == REDIS_ENCODING_SKIPLIST) + return rdbSaveType(rdb,REDIS_RDB_TYPE_ZSET); + else + redisPanic("Unknown sorted set encoding"); + case REDIS_HASH: + if (o->encoding == REDIS_ENCODING_ZIPLIST) + return rdbSaveType(rdb,REDIS_RDB_TYPE_HASH_ZIPLIST); + else if (o->encoding == REDIS_ENCODING_HT) + return rdbSaveType(rdb,REDIS_RDB_TYPE_HASH); + else + redisPanic("Unknown hash encoding"); + default: + redisPanic("Unknown object type"); + } + return -1; /* avoid warning */ +} + +/* Use rdbLoadType() to load a TYPE in RDB format, but returns -1 if the + * type is not specifically a valid Object Type. */ +int rdbLoadObjectType(rio *rdb) { + int type; + if ((type = rdbLoadType(rdb)) == -1) return -1; + if (!rdbIsObjectType(type)) return -1; + return type; +} + +/* Save a Redis object. Returns -1 on error, 0 on success. */ +int rdbSaveObject(rio *rdb, robj *o) { int n, nwritten = 0; if (o->type == REDIS_STRING) { /* Save a string value */ - if ((n = rdbSaveStringObject(fp,o)) == -1) return -1; + if ((n = rdbSaveStringObject(rdb,o)) == -1) return -1; nwritten += n; } else if (o->type == REDIS_LIST) { /* Save a list value */ if (o->encoding == REDIS_ENCODING_ZIPLIST) { - unsigned char *p; - unsigned char *vstr; - unsigned int vlen; - long long vlong; + size_t l = ziplistBlobLen((unsigned char*)o->ptr); - if ((n = rdbSaveLen(fp,ziplistLen(o->ptr))) == -1) return -1; + if ((n = rdbSaveRawString(rdb,o->ptr,l)) == -1) return -1; nwritten += n; - - p = ziplistIndex(o->ptr,0); - while(ziplistGet(p,&vstr,&vlen,&vlong)) { - if (vstr) { - if ((n = rdbSaveRawString(fp,vstr,vlen)) == -1) - return -1; - nwritten += n; - } else { - if ((n = rdbSaveLongLongAsStringObject(fp,vlong)) == -1) - return -1; - nwritten += n; - } - p = ziplistNext(o->ptr,p); - } } else if (o->encoding == REDIS_ENCODING_LINKEDLIST) { list *list = o->ptr; listIter li; listNode *ln; - if ((n = rdbSaveLen(fp,listLength(list))) == -1) return -1; + if ((n = rdbSaveLen(rdb,listLength(list))) == -1) return -1; nwritten += n; listRewind(list,&li); while((ln = listNext(&li))) { robj *eleobj = listNodeValue(ln); - if ((n = rdbSaveStringObject(fp,eleobj)) == -1) return -1; + if ((n = rdbSaveStringObject(rdb,eleobj)) == -1) return -1; nwritten += n; } } else { @@ -301,84 +484,81 @@ int rdbSaveObject(FILE *fp, robj *o) { dictIterator *di = dictGetIterator(set); dictEntry *de; - if ((n = rdbSaveLen(fp,dictSize(set))) == -1) return -1; + if ((n = rdbSaveLen(rdb,dictSize(set))) == -1) return -1; nwritten += n; while((de = dictNext(di)) != NULL) { - robj *eleobj = dictGetEntryKey(de); - if ((n = rdbSaveStringObject(fp,eleobj)) == -1) return -1; + robj *eleobj = dictGetKey(de); + if ((n = rdbSaveStringObject(rdb,eleobj)) == -1) return -1; nwritten += n; } dictReleaseIterator(di); } else if (o->encoding == REDIS_ENCODING_INTSET) { - intset *is = o->ptr; - int64_t llval; - int i = 0; + size_t l = intsetBlobLen((intset*)o->ptr); - if ((n = rdbSaveLen(fp,intsetLen(is))) == -1) return -1; + if ((n = rdbSaveRawString(rdb,o->ptr,l)) == -1) return -1; nwritten += n; - - while(intsetGet(is,i++,&llval)) { - if ((n = rdbSaveLongLongAsStringObject(fp,llval)) == -1) return -1; - nwritten += n; - } } else { redisPanic("Unknown set encoding"); } } else if (o->type == REDIS_ZSET) { - /* Save a set value */ - zset *zs = o->ptr; - dictIterator *di = dictGetIterator(zs->dict); - dictEntry *de; - - if ((n = rdbSaveLen(fp,dictSize(zs->dict))) == -1) return -1; - nwritten += n; - - while((de = dictNext(di)) != NULL) { - robj *eleobj = dictGetEntryKey(de); - double *score = dictGetEntryVal(de); + /* Save a sorted set value */ + if (o->encoding == REDIS_ENCODING_ZIPLIST) { + size_t l = ziplistBlobLen((unsigned char*)o->ptr); - if ((n = rdbSaveStringObject(fp,eleobj)) == -1) return -1; - nwritten += n; - if ((n = rdbSaveDoubleValue(fp,*score)) == -1) return -1; + if ((n = rdbSaveRawString(rdb,o->ptr,l)) == -1) return -1; nwritten += n; - } - dictReleaseIterator(di); - } else if (o->type == REDIS_HASH) { - /* Save a hash value */ - if (o->encoding == REDIS_ENCODING_ZIPMAP) { - unsigned char *p = zipmapRewind(o->ptr); - unsigned int count = zipmapLen(o->ptr); - unsigned char *key, *val; - unsigned int klen, vlen; + } else if (o->encoding == REDIS_ENCODING_SKIPLIST) { + zset *zs = o->ptr; + dictIterator *di = dictGetIterator(zs->dict); + dictEntry *de; - if ((n = rdbSaveLen(fp,count)) == -1) return -1; + if ((n = rdbSaveLen(rdb,dictSize(zs->dict))) == -1) return -1; nwritten += n; - while((p = zipmapNext(p,&key,&klen,&val,&vlen)) != NULL) { - if ((n = rdbSaveRawString(fp,key,klen)) == -1) return -1; + while((de = dictNext(di)) != NULL) { + robj *eleobj = dictGetKey(de); + double *score = dictGetVal(de); + + if ((n = rdbSaveStringObject(rdb,eleobj)) == -1) return -1; nwritten += n; - if ((n = rdbSaveRawString(fp,val,vlen)) == -1) return -1; + if ((n = rdbSaveDoubleValue(rdb,*score)) == -1) return -1; nwritten += n; } + dictReleaseIterator(di); } else { + redisPanic("Unknown sorted set encoding"); + } + } else if (o->type == REDIS_HASH) { + /* Save a hash value */ + if (o->encoding == REDIS_ENCODING_ZIPLIST) { + size_t l = ziplistBlobLen((unsigned char*)o->ptr); + + if ((n = rdbSaveRawString(rdb,o->ptr,l)) == -1) return -1; + nwritten += n; + + } else if (o->encoding == REDIS_ENCODING_HT) { dictIterator *di = dictGetIterator(o->ptr); dictEntry *de; - if ((n = rdbSaveLen(fp,dictSize((dict*)o->ptr))) == -1) return -1; + if ((n = rdbSaveLen(rdb,dictSize((dict*)o->ptr))) == -1) return -1; nwritten += n; while((de = dictNext(di)) != NULL) { - robj *key = dictGetEntryKey(de); - robj *val = dictGetEntryVal(de); + robj *key = dictGetKey(de); + robj *val = dictGetVal(de); - if ((n = rdbSaveStringObject(fp,key)) == -1) return -1; + if ((n = rdbSaveStringObject(rdb,key)) == -1) return -1; nwritten += n; - if ((n = rdbSaveStringObject(fp,val)) == -1) return -1; + if ((n = rdbSaveStringObject(rdb,val)) == -1) return -1; nwritten += n; } dictReleaseIterator(di); + + } else { + redisPanic("Unknown hash encoding"); } + } else { redisPanic("Unknown object type"); } @@ -391,93 +571,94 @@ int rdbSaveObject(FILE *fp, robj *o) { * we could switch to a faster solution. */ off_t rdbSavedObjectLen(robj *o) { int len = rdbSaveObject(NULL,o); - redisAssert(len != -1); + redisAssertWithInfo(NULL,o,len != -1); return len; } -/* Return the number of pages required to save this object in the swap file */ -off_t rdbSavedObjectPages(robj *o) { - off_t bytes = rdbSavedObjectLen(o); - return (bytes+(server.vm_page_size-1))/server.vm_page_size; +/* Save a key-value pair, with expire time, type, key, value. + * On error -1 is returned. + * On success if the key was actaully saved 1 is returned, otherwise 0 + * is returned (the key was already expired). */ +int rdbSaveKeyValuePair(rio *rdb, robj *key, robj *val, + long long expiretime, long long now) +{ + /* Save the expire time */ + if (expiretime != -1) { + /* If this key is already expired skip it */ + if (expiretime < now) return 0; + if (rdbSaveType(rdb,REDIS_RDB_OPCODE_EXPIRETIME_MS) == -1) return -1; + if (rdbSaveMillisecondTime(rdb,expiretime) == -1) return -1; + } + + /* Save type, key, value */ + if (rdbSaveObjectType(rdb,val) == -1) return -1; + if (rdbSaveStringObject(rdb,key) == -1) return -1; + if (rdbSaveObject(rdb,val) == -1) return -1; + return 1; } /* Save the DB on disk. Return REDIS_ERR on error, REDIS_OK on success */ int rdbSave(char *filename) { dictIterator *di = NULL; dictEntry *de; - FILE *fp; char tmpfile[256]; + char magic[10]; int j; - time_t now = time(NULL); - - /* Wait for I/O therads to terminate, just in case this is a - * foreground-saving, to avoid seeking the swap file descriptor at the - * same time. */ - if (server.vm_enabled) - waitEmptyIOJobsQueue(); + long long now = mstime(); + FILE *fp; + rio rdb; + uint64_t cksum; snprintf(tmpfile,256,"temp-%d.rdb", (int) getpid()); fp = fopen(tmpfile,"w"); if (!fp) { - redisLog(REDIS_WARNING, "Failed saving the DB: %s", strerror(errno)); + redisLog(REDIS_WARNING, "Failed opening .rdb for saving: %s", + strerror(errno)); return REDIS_ERR; } - if (fwrite("REDIS0001",9,1,fp) == 0) goto werr; + + rioInitWithFile(&rdb,fp); + if (server.rdb_checksum) + rdb.update_cksum = rioGenericUpdateChecksum; + snprintf(magic,sizeof(magic),"REDIS%04d",REDIS_RDB_VERSION); + if (rdbWriteRaw(&rdb,magic,9) == -1) goto werr; + for (j = 0; j < server.dbnum; j++) { redisDb *db = server.db+j; dict *d = db->dict; if (dictSize(d) == 0) continue; - di = dictGetIterator(d); + di = dictGetSafeIterator(d); if (!di) { fclose(fp); return REDIS_ERR; } /* Write the SELECT DB opcode */ - if (rdbSaveType(fp,REDIS_SELECTDB) == -1) goto werr; - if (rdbSaveLen(fp,j) == -1) goto werr; + if (rdbSaveType(&rdb,REDIS_RDB_OPCODE_SELECTDB) == -1) goto werr; + if (rdbSaveLen(&rdb,j) == -1) goto werr; /* Iterate this DB writing every entry */ while((de = dictNext(di)) != NULL) { - sds keystr = dictGetEntryKey(de); - robj key, *o = dictGetEntryVal(de); - time_t expiretime; + sds keystr = dictGetKey(de); + robj key, *o = dictGetVal(de); + long long expire; initStaticStringObject(key,keystr); - expiretime = getExpire(db,&key); - - /* Save the expire time */ - if (expiretime != -1) { - /* If this key is already expired skip it */ - if (expiretime < now) continue; - if (rdbSaveType(fp,REDIS_EXPIRETIME) == -1) goto werr; - if (rdbSaveTime(fp,expiretime) == -1) goto werr; - } - /* Save the key and associated value. This requires special - * handling if the value is swapped out. */ - if (!server.vm_enabled || o->storage == REDIS_VM_MEMORY || - o->storage == REDIS_VM_SWAPPING) { - /* Save type, key, value */ - if (rdbSaveType(fp,o->type) == -1) goto werr; - if (rdbSaveStringObject(fp,&key) == -1) goto werr; - if (rdbSaveObject(fp,o) == -1) goto werr; - } else { - /* REDIS_VM_SWAPPED or REDIS_VM_LOADING */ - robj *po; - /* Get a preview of the object in memory */ - po = vmPreviewObject(o); - /* Save type, key, value */ - if (rdbSaveType(fp,po->type) == -1) goto werr; - if (rdbSaveStringObject(fp,&key) == -1) goto werr; - if (rdbSaveObject(fp,po) == -1) goto werr; - /* Remove the loaded object from memory */ - decrRefCount(po); - } + expire = getExpire(db,&key); + if (rdbSaveKeyValuePair(&rdb,&key,o,expire,now) == -1) goto werr; } dictReleaseIterator(di); } + di = NULL; /* So that we don't release it again on error. */ + /* EOF opcode */ - if (rdbSaveType(fp,REDIS_EOF) == -1) goto werr; + if (rdbSaveType(&rdb,REDIS_RDB_OPCODE_EOF) == -1) goto werr; + + /* CRC64 checksum. It will be zero if checksum computation is disabled, the + * loading code skips the check in this case. */ + cksum = rdb.cksum; + memrev64ifbe(&cksum); + rioWrite(&rdb,&cksum,8); /* Make sure data will not remain on the OS's output buffers */ fflush(fp); @@ -494,6 +675,7 @@ int rdbSave(char *filename) { redisLog(REDIS_NOTICE,"DB saved on disk"); server.dirty = 0; server.lastsave = time(NULL); + server.lastbgsave_status = REDIS_OK; return REDIS_OK; werr: @@ -506,29 +688,32 @@ werr: int rdbSaveBackground(char *filename) { pid_t childpid; + long long start; + + if (server.rdb_child_pid != -1) return REDIS_ERR; - if (server.bgsavechildpid != -1) return REDIS_ERR; - if (server.vm_enabled) waitEmptyIOJobsQueue(); server.dirty_before_bgsave = server.dirty; + + start = ustime(); if ((childpid = fork()) == 0) { + int retval; + /* Child */ - if (server.vm_enabled) vmReopenSwapFile(); if (server.ipfd > 0) close(server.ipfd); if (server.sofd > 0) close(server.sofd); - if (rdbSave(filename) == REDIS_OK) { - _exit(0); - } else { - _exit(1); - } + retval = rdbSave(filename); + exitFromChild((retval == REDIS_OK) ? 0 : 1); } else { /* Parent */ + server.stat_fork_time = ustime()-start; if (childpid == -1) { redisLog(REDIS_WARNING,"Can't save in background: fork: %s", strerror(errno)); return REDIS_ERR; } redisLog(REDIS_NOTICE,"Background saving started by pid %d",childpid); - server.bgsavechildpid = childpid; + server.rdb_save_time_start = time(NULL); + server.rdb_child_pid = childpid; updateDictResizePolicy(); return REDIS_OK; } @@ -542,168 +727,21 @@ void rdbRemoveTempFile(pid_t childpid) { unlink(tmpfile); } -int rdbLoadType(FILE *fp) { - unsigned char type; - if (fread(&type,1,1,fp) == 0) return -1; - return type; -} - -time_t rdbLoadTime(FILE *fp) { - int32_t t32; - if (fread(&t32,4,1,fp) == 0) return -1; - return (time_t) t32; -} - -/* Load an encoded length from the DB, see the REDIS_RDB_* defines on the top - * of this file for a description of how this are stored on disk. - * - * isencoded is set to 1 if the readed length is not actually a length but - * an "encoding type", check the above comments for more info */ -uint32_t rdbLoadLen(FILE *fp, int *isencoded) { - unsigned char buf[2]; - uint32_t len; - int type; - - if (isencoded) *isencoded = 0; - if (fread(buf,1,1,fp) == 0) return REDIS_RDB_LENERR; - type = (buf[0]&0xC0)>>6; - if (type == REDIS_RDB_6BITLEN) { - /* Read a 6 bit len */ - return buf[0]&0x3F; - } else if (type == REDIS_RDB_ENCVAL) { - /* Read a 6 bit len encoding type */ - if (isencoded) *isencoded = 1; - return buf[0]&0x3F; - } else if (type == REDIS_RDB_14BITLEN) { - /* Read a 14 bit len */ - if (fread(buf+1,1,1,fp) == 0) return REDIS_RDB_LENERR; - return ((buf[0]&0x3F)<<8)|buf[1]; - } else { - /* Read a 32 bit len */ - if (fread(&len,4,1,fp) == 0) return REDIS_RDB_LENERR; - return ntohl(len); - } -} - -/* Load an integer-encoded object from file 'fp', with the specified - * encoding type 'enctype'. If encode is true the function may return - * an integer-encoded object as reply, otherwise the returned object - * will always be encoded as a raw string. */ -robj *rdbLoadIntegerObject(FILE *fp, int enctype, int encode) { - unsigned char enc[4]; - long long val; - - if (enctype == REDIS_RDB_ENC_INT8) { - if (fread(enc,1,1,fp) == 0) return NULL; - val = (signed char)enc[0]; - } else if (enctype == REDIS_RDB_ENC_INT16) { - uint16_t v; - if (fread(enc,2,1,fp) == 0) return NULL; - v = enc[0]|(enc[1]<<8); - val = (int16_t)v; - } else if (enctype == REDIS_RDB_ENC_INT32) { - uint32_t v; - if (fread(enc,4,1,fp) == 0) return NULL; - v = enc[0]|(enc[1]<<8)|(enc[2]<<16)|(enc[3]<<24); - val = (int32_t)v; - } else { - val = 0; /* anti-warning */ - redisPanic("Unknown RDB integer encoding type"); - } - if (encode) - return createStringObjectFromLongLong(val); - else - return createObject(REDIS_STRING,sdsfromlonglong(val)); -} - -robj *rdbLoadLzfStringObject(FILE*fp) { - unsigned int len, clen; - unsigned char *c = NULL; - sds val = NULL; - - if ((clen = rdbLoadLen(fp,NULL)) == REDIS_RDB_LENERR) return NULL; - if ((len = rdbLoadLen(fp,NULL)) == REDIS_RDB_LENERR) return NULL; - if ((c = zmalloc(clen)) == NULL) goto err; - if ((val = sdsnewlen(NULL,len)) == NULL) goto err; - if (fread(c,clen,1,fp) == 0) goto err; - if (lzf_decompress(c,clen,val,len) == 0) goto err; - zfree(c); - return createObject(REDIS_STRING,val); -err: - zfree(c); - sdsfree(val); - return NULL; -} - -robj *rdbGenericLoadStringObject(FILE*fp, int encode) { - int isencoded; - uint32_t len; - sds val; - - len = rdbLoadLen(fp,&isencoded); - if (isencoded) { - switch(len) { - case REDIS_RDB_ENC_INT8: - case REDIS_RDB_ENC_INT16: - case REDIS_RDB_ENC_INT32: - return rdbLoadIntegerObject(fp,len,encode); - case REDIS_RDB_ENC_LZF: - return rdbLoadLzfStringObject(fp); - default: - redisPanic("Unknown RDB encoding type"); - } - } - - if (len == REDIS_RDB_LENERR) return NULL; - val = sdsnewlen(NULL,len); - if (len && fread(val,len,1,fp) == 0) { - sdsfree(val); - return NULL; - } - return createObject(REDIS_STRING,val); -} - -robj *rdbLoadStringObject(FILE *fp) { - return rdbGenericLoadStringObject(fp,0); -} - -robj *rdbLoadEncodedStringObject(FILE *fp) { - return rdbGenericLoadStringObject(fp,1); -} - -/* For information about double serialization check rdbSaveDoubleValue() */ -int rdbLoadDoubleValue(FILE *fp, double *val) { - char buf[128]; - unsigned char len; - - if (fread(&len,1,1,fp) == 0) return -1; - switch(len) { - case 255: *val = R_NegInf; return 0; - case 254: *val = R_PosInf; return 0; - case 253: *val = R_Nan; return 0; - default: - if (fread(buf,len,1,fp) == 0) return -1; - buf[len] = '\0'; - sscanf(buf, "%lg", val); - return 0; - } -} - /* Load a Redis object of the specified type from the specified file. * On success a newly allocated object is returned, otherwise NULL. */ -robj *rdbLoadObject(int type, FILE *fp) { +robj *rdbLoadObject(int rdbtype, rio *rdb) { robj *o, *ele, *dec; size_t len; unsigned int i; - redisLog(REDIS_DEBUG,"LOADING OBJECT %d (at %d)\n",type,ftell(fp)); - if (type == REDIS_STRING) { + redisLog(REDIS_DEBUG,"LOADING OBJECT %d (at %d)\n",rdbtype,rioTell(rdb)); + if (rdbtype == REDIS_RDB_TYPE_STRING) { /* Read string value */ - if ((o = rdbLoadEncodedStringObject(fp)) == NULL) return NULL; + if ((o = rdbLoadEncodedStringObject(rdb)) == NULL) return NULL; o = tryObjectEncoding(o); - } else if (type == REDIS_LIST) { + } else if (rdbtype == REDIS_RDB_TYPE_LIST) { /* Read list value */ - if ((len = rdbLoadLen(fp,NULL)) == REDIS_RDB_LENERR) return NULL; + if ((len = rdbLoadLen(rdb,NULL)) == REDIS_RDB_LENERR) return NULL; /* Use a real list when there are too many entries */ if (len > server.list_max_ziplist_entries) { @@ -714,7 +752,7 @@ robj *rdbLoadObject(int type, FILE *fp) { /* Load every single element of the list */ while(len--) { - if ((ele = rdbLoadEncodedStringObject(fp)) == NULL) return NULL; + if ((ele = rdbLoadEncodedStringObject(rdb)) == NULL) return NULL; /* If we are using a ziplist and the value is too big, convert * the object to a real list. */ @@ -733,9 +771,9 @@ robj *rdbLoadObject(int type, FILE *fp) { listAddNodeTail(o->ptr,ele); } } - } else if (type == REDIS_SET) { + } else if (rdbtype == REDIS_RDB_TYPE_SET) { /* Read list/set value */ - if ((len = rdbLoadLen(fp,NULL)) == REDIS_RDB_LENERR) return NULL; + if ((len = rdbLoadLen(rdb,NULL)) == REDIS_RDB_LENERR) return NULL; /* Use a regular set when there are too many entries. */ if (len > server.set_max_intset_entries) { @@ -751,7 +789,7 @@ robj *rdbLoadObject(int type, FILE *fp) { /* Load every single element of the list/set */ for (i = 0; i < len; i++) { long long llval; - if ((ele = rdbLoadEncodedStringObject(fp)) == NULL) return NULL; + if ((ele = rdbLoadEncodedStringObject(rdb)) == NULL) return NULL; ele = tryObjectEncoding(ele); if (o->encoding == REDIS_ENCODING_INTSET) { @@ -772,72 +810,181 @@ robj *rdbLoadObject(int type, FILE *fp) { decrRefCount(ele); } } - } else if (type == REDIS_ZSET) { + } else if (rdbtype == REDIS_RDB_TYPE_ZSET) { /* Read list/set value */ size_t zsetlen; + size_t maxelelen = 0; zset *zs; - if ((zsetlen = rdbLoadLen(fp,NULL)) == REDIS_RDB_LENERR) return NULL; + if ((zsetlen = rdbLoadLen(rdb,NULL)) == REDIS_RDB_LENERR) return NULL; o = createZsetObject(); zs = o->ptr; + /* Load every single element of the list/set */ while(zsetlen--) { robj *ele; double score; zskiplistNode *znode; - if ((ele = rdbLoadEncodedStringObject(fp)) == NULL) return NULL; + if ((ele = rdbLoadEncodedStringObject(rdb)) == NULL) return NULL; ele = tryObjectEncoding(ele); - if (rdbLoadDoubleValue(fp,&score) == -1) return NULL; + if (rdbLoadDoubleValue(rdb,&score) == -1) return NULL; + + /* Don't care about integer-encoded strings. */ + if (ele->encoding == REDIS_ENCODING_RAW && + sdslen(ele->ptr) > maxelelen) + maxelelen = sdslen(ele->ptr); + znode = zslInsert(zs->zsl,score,ele); dictAdd(zs->dict,ele,&znode->score); incrRefCount(ele); /* added to skiplist */ } - } else if (type == REDIS_HASH) { - size_t hashlen; - if ((hashlen = rdbLoadLen(fp,NULL)) == REDIS_RDB_LENERR) return NULL; + /* Convert *after* loading, since sorted sets are not stored ordered. */ + if (zsetLength(o) <= server.zset_max_ziplist_entries && + maxelelen <= server.zset_max_ziplist_value) + zsetConvert(o,REDIS_ENCODING_ZIPLIST); + } else if (rdbtype == REDIS_RDB_TYPE_HASH) { + size_t len; + int ret; + + len = rdbLoadLen(rdb, NULL); + if (len == REDIS_RDB_LENERR) return NULL; + o = createHashObject(); + /* Too many entries? Use an hash table. */ - if (hashlen > server.hash_max_zipmap_entries) - convertToRealHash(o); - /* Load every key/value, then set it into the zipmap or hash - * table, as needed. */ - while(hashlen--) { - robj *key, *val; - - if ((key = rdbLoadEncodedStringObject(fp)) == NULL) return NULL; - if ((val = rdbLoadEncodedStringObject(fp)) == NULL) return NULL; - /* If we are using a zipmap and there are too big values - * the object is converted to real hash table encoding. */ - if (o->encoding != REDIS_ENCODING_HT && - ((key->encoding == REDIS_ENCODING_RAW && - sdslen(key->ptr) > server.hash_max_zipmap_value) || - (val->encoding == REDIS_ENCODING_RAW && - sdslen(val->ptr) > server.hash_max_zipmap_value))) + if (len > server.hash_max_ziplist_entries) + hashTypeConvert(o, REDIS_ENCODING_HT); + + /* Load every field and value into the ziplist */ + while (o->encoding == REDIS_ENCODING_ZIPLIST && len > 0) { + robj *field, *value; + + len--; + /* Load raw strings */ + field = rdbLoadStringObject(rdb); + if (field == NULL) return NULL; + redisAssert(field->encoding == REDIS_ENCODING_RAW); + value = rdbLoadStringObject(rdb); + if (value == NULL) return NULL; + redisAssert(field->encoding == REDIS_ENCODING_RAW); + + /* Add pair to ziplist */ + o->ptr = ziplistPush(o->ptr, field->ptr, sdslen(field->ptr), ZIPLIST_TAIL); + o->ptr = ziplistPush(o->ptr, value->ptr, sdslen(value->ptr), ZIPLIST_TAIL); + /* Convert to hash table if size threshold is exceeded */ + if (sdslen(field->ptr) > server.hash_max_ziplist_value || + sdslen(value->ptr) > server.hash_max_ziplist_value) { - convertToRealHash(o); + decrRefCount(field); + decrRefCount(value); + hashTypeConvert(o, REDIS_ENCODING_HT); + break; } + decrRefCount(field); + decrRefCount(value); + } - if (o->encoding == REDIS_ENCODING_ZIPMAP) { - unsigned char *zm = o->ptr; - robj *deckey, *decval; - - /* We need raw string objects to add them to the zipmap */ - deckey = getDecodedObject(key); - decval = getDecodedObject(val); - zm = zipmapSet(zm,deckey->ptr,sdslen(deckey->ptr), - decval->ptr,sdslen(decval->ptr),NULL); - o->ptr = zm; - decrRefCount(deckey); - decrRefCount(decval); - decrRefCount(key); - decrRefCount(val); - } else { - key = tryObjectEncoding(key); - val = tryObjectEncoding(val); - dictAdd((dict*)o->ptr,key,val); - } + /* Load remaining fields and values into the hash table */ + while (o->encoding == REDIS_ENCODING_HT && len > 0) { + robj *field, *value; + + len--; + /* Load encoded strings */ + field = rdbLoadEncodedStringObject(rdb); + if (field == NULL) return NULL; + value = rdbLoadEncodedStringObject(rdb); + if (value == NULL) return NULL; + + field = tryObjectEncoding(field); + value = tryObjectEncoding(value); + + /* Add pair to hash table */ + ret = dictAdd((dict*)o->ptr, field, value); + redisAssert(ret == REDIS_OK); + } + + /* All pairs should be read by now */ + redisAssert(len == 0); + + } else if (rdbtype == REDIS_RDB_TYPE_HASH_ZIPMAP || + rdbtype == REDIS_RDB_TYPE_LIST_ZIPLIST || + rdbtype == REDIS_RDB_TYPE_SET_INTSET || + rdbtype == REDIS_RDB_TYPE_ZSET_ZIPLIST || + rdbtype == REDIS_RDB_TYPE_HASH_ZIPLIST) + { + robj *aux = rdbLoadStringObject(rdb); + + if (aux == NULL) return NULL; + o = createObject(REDIS_STRING,NULL); /* string is just placeholder */ + o->ptr = zmalloc(sdslen(aux->ptr)); + memcpy(o->ptr,aux->ptr,sdslen(aux->ptr)); + decrRefCount(aux); + + /* Fix the object encoding, and make sure to convert the encoded + * data type into the base type if accordingly to the current + * configuration there are too many elements in the encoded data + * type. Note that we only check the length and not max element + * size as this is an O(N) scan. Eventually everything will get + * converted. */ + switch(rdbtype) { + case REDIS_RDB_TYPE_HASH_ZIPMAP: + /* Convert to ziplist encoded hash. This must be deprecated + * when loading dumps created by Redis 2.4 gets deprecated. */ + { + unsigned char *zl = ziplistNew(); + unsigned char *zi = zipmapRewind(o->ptr); + unsigned char *fstr, *vstr; + unsigned int flen, vlen; + unsigned int maxlen = 0; + + while ((zi = zipmapNext(zi, &fstr, &flen, &vstr, &vlen)) != NULL) { + if (flen > maxlen) maxlen = flen; + if (vlen > maxlen) maxlen = vlen; + zl = ziplistPush(zl, fstr, flen, ZIPLIST_TAIL); + zl = ziplistPush(zl, vstr, vlen, ZIPLIST_TAIL); + } + + zfree(o->ptr); + o->ptr = zl; + o->type = REDIS_HASH; + o->encoding = REDIS_ENCODING_ZIPLIST; + + if (hashTypeLength(o) > server.hash_max_ziplist_entries || + maxlen > server.hash_max_ziplist_value) + { + hashTypeConvert(o, REDIS_ENCODING_HT); + } + } + break; + case REDIS_RDB_TYPE_LIST_ZIPLIST: + o->type = REDIS_LIST; + o->encoding = REDIS_ENCODING_ZIPLIST; + if (ziplistLen(o->ptr) > server.list_max_ziplist_entries) + listTypeConvert(o,REDIS_ENCODING_LINKEDLIST); + break; + case REDIS_RDB_TYPE_SET_INTSET: + o->type = REDIS_SET; + o->encoding = REDIS_ENCODING_INTSET; + if (intsetLen(o->ptr) > server.set_max_intset_entries) + setTypeConvert(o,REDIS_ENCODING_HT); + break; + case REDIS_RDB_TYPE_ZSET_ZIPLIST: + o->type = REDIS_ZSET; + o->encoding = REDIS_ENCODING_ZIPLIST; + if (zsetLength(o) > server.zset_max_ziplist_entries) + zsetConvert(o,REDIS_ENCODING_SKIPLIST); + break; + case REDIS_RDB_TYPE_HASH_ZIPLIST: + o->type = REDIS_HASH; + o->encoding = REDIS_ENCODING_ZIPLIST; + if (hashTypeLength(o) > server.hash_max_ziplist_entries) + hashTypeConvert(o, REDIS_ENCODING_HT); + break; + default: + redisPanic("Unknown encoding"); + break; } } else { redisPanic("Unknown object type"); @@ -871,55 +1018,73 @@ void stopLoading(void) { } int rdbLoad(char *filename) { - FILE *fp; uint32_t dbid; - int type, retval, rdbver; - int swap_all_values = 0; + int type, rdbver; redisDb *db = server.db+0; char buf[1024]; - time_t expiretime, now = time(NULL); + long long expiretime, now = mstime(); long loops = 0; + FILE *fp; + rio rdb; fp = fopen(filename,"r"); - if (!fp) return REDIS_ERR; - if (fread(buf,9,1,fp) == 0) goto eoferr; + if (!fp) { + errno = ENOENT; + return REDIS_ERR; + } + rioInitWithFile(&rdb,fp); + if (server.rdb_checksum) + rdb.update_cksum = rioGenericUpdateChecksum; + if (rioRead(&rdb,buf,9) == 0) goto eoferr; buf[9] = '\0'; if (memcmp(buf,"REDIS",5) != 0) { fclose(fp); redisLog(REDIS_WARNING,"Wrong signature trying to load DB from file"); + errno = EINVAL; return REDIS_ERR; } rdbver = atoi(buf+5); - if (rdbver != 1) { + if (rdbver < 1 || rdbver > REDIS_RDB_VERSION) { fclose(fp); redisLog(REDIS_WARNING,"Can't handle RDB format version %d",rdbver); + errno = EINVAL; return REDIS_ERR; } startLoading(fp); while(1) { robj *key, *val; - int force_swapout; - expiretime = -1; /* Serve the clients from time to time */ if (!(loops++ % 1000)) { - loadingProgress(ftello(fp)); + loadingProgress(rioTell(&rdb)); aeProcessEvents(server.el, AE_FILE_EVENTS|AE_DONT_WAIT); } /* Read type. */ - if ((type = rdbLoadType(fp)) == -1) goto eoferr; - if (type == REDIS_EXPIRETIME) { - if ((expiretime = rdbLoadTime(fp)) == -1) goto eoferr; - /* We read the time so we need to read the object type again */ - if ((type = rdbLoadType(fp)) == -1) goto eoferr; + if ((type = rdbLoadType(&rdb)) == -1) goto eoferr; + if (type == REDIS_RDB_OPCODE_EXPIRETIME) { + if ((expiretime = rdbLoadTime(&rdb)) == -1) goto eoferr; + /* We read the time so we need to read the object type again. */ + if ((type = rdbLoadType(&rdb)) == -1) goto eoferr; + /* the EXPIRETIME opcode specifies time in seconds, so convert + * into milliesconds. */ + expiretime *= 1000; + } else if (type == REDIS_RDB_OPCODE_EXPIRETIME_MS) { + /* Milliseconds precision expire times introduced with RDB + * version 3. */ + if ((expiretime = rdbLoadMillisecondTime(&rdb)) == -1) goto eoferr; + /* We read the time so we need to read the object type again. */ + if ((type = rdbLoadType(&rdb)) == -1) goto eoferr; } - if (type == REDIS_EOF) break; + + if (type == REDIS_RDB_OPCODE_EOF) + break; + /* Handle SELECT DB opcode as a special case */ - if (type == REDIS_SELECTDB) { - if ((dbid = rdbLoadLen(fp,NULL)) == REDIS_RDB_LENERR) + if (type == REDIS_RDB_OPCODE_SELECTDB) { + if ((dbid = rdbLoadLen(&rdb,NULL)) == REDIS_RDB_LENERR) goto eoferr; if (dbid >= (unsigned)server.dbnum) { redisLog(REDIS_WARNING,"FATAL: Data file was created with a Redis server configured to handle more than %d databases. Exiting\n", server.dbnum); @@ -929,63 +1094,41 @@ int rdbLoad(char *filename) { continue; } /* Read key */ - if ((key = rdbLoadStringObject(fp)) == NULL) goto eoferr; + if ((key = rdbLoadStringObject(&rdb)) == NULL) goto eoferr; /* Read value */ - if ((val = rdbLoadObject(type,fp)) == NULL) goto eoferr; - /* Check if the key already expired */ - if (expiretime != -1 && expiretime < now) { + if ((val = rdbLoadObject(type,&rdb)) == NULL) goto eoferr; + /* Check if the key already expired. This function is used when loading + * an RDB file from disk, either at startup, or when an RDB was + * received from the master. In the latter case, the master is + * responsible for key expiry. If we would expire keys here, the + * snapshot taken by the master may not be reflected on the slave. */ + if (server.masterhost == NULL && expiretime != -1 && expiretime < now) { decrRefCount(key); decrRefCount(val); continue; } /* Add the new object in the hash table */ - retval = dbAdd(db,key,val); - if (retval == REDIS_ERR) { - redisLog(REDIS_WARNING,"Loading DB, duplicated key (%s) found! Unrecoverable error, exiting now.", key->ptr); - exit(1); - } + dbAdd(db,key,val); + /* Set the expire time if needed */ if (expiretime != -1) setExpire(db,key,expiretime); - /* Handle swapping while loading big datasets when VM is on */ - - /* If we detecter we are hopeless about fitting something in memory - * we just swap every new key on disk. Directly... - * Note that's important to check for this condition before resorting - * to random sampling, otherwise we may try to swap already - * swapped keys. */ - if (swap_all_values) { - dictEntry *de = dictFind(db->dict,key->ptr); - - /* de may be NULL since the key already expired */ - if (de) { - vmpointer *vp; - val = dictGetEntryVal(de); - - if (val->refcount == 1 && - (vp = vmSwapObjectBlocking(val)) != NULL) - dictGetEntryVal(de) = vp; - } - decrRefCount(key); - continue; - } decrRefCount(key); - - /* Flush data on disk once 32 MB of additional RAM are used... */ - force_swapout = 0; - if ((zmalloc_used_memory() - server.vm_max_memory) > 1024*1024*32) - force_swapout = 1; - - /* If we have still some hope of having some value fitting memory - * then we try random sampling. */ - if (!swap_all_values && server.vm_enabled && force_swapout) { - while (zmalloc_used_memory() > server.vm_max_memory) { - if (vmSwapOneObjectBlocking() == REDIS_ERR) break; - } - if (zmalloc_used_memory() > server.vm_max_memory) - swap_all_values = 1; /* We are already using too much mem */ + } + /* Verify the checksum if RDB version is >= 5 */ + if (rdbver >= 5 && server.rdb_checksum) { + uint64_t cksum, expected = rdb.cksum; + + if (rioRead(&rdb,&cksum,8) == 0) goto eoferr; + memrev64ifbe(&cksum); + if (cksum == 0) { + redisLog(REDIS_WARNING,"RDB file was saved with checksum disabled: no check performed."); + } else if (cksum != expected) { + redisLog(REDIS_WARNING,"Wrong RDB checksum. Aborting now."); + exit(1); } } + fclose(fp); stopLoading(); return REDIS_OK; @@ -997,24 +1140,50 @@ eoferr: /* unexpected end of file is handled here with a fatal exit */ } /* A background saving child (BGSAVE) terminated its work. Handle this. */ -void backgroundSaveDoneHandler(int statloc) { - int exitcode = WEXITSTATUS(statloc); - int bysignal = WIFSIGNALED(statloc); - +void backgroundSaveDoneHandler(int exitcode, int bysignal) { if (!bysignal && exitcode == 0) { redisLog(REDIS_NOTICE, "Background saving terminated with success"); server.dirty = server.dirty - server.dirty_before_bgsave; server.lastsave = time(NULL); + server.lastbgsave_status = REDIS_OK; } else if (!bysignal && exitcode != 0) { redisLog(REDIS_WARNING, "Background saving error"); + server.lastbgsave_status = REDIS_ERR; } else { redisLog(REDIS_WARNING, - "Background saving terminated by signal %d", WTERMSIG(statloc)); - rdbRemoveTempFile(server.bgsavechildpid); + "Background saving terminated by signal %d", bysignal); + rdbRemoveTempFile(server.rdb_child_pid); + server.lastbgsave_status = REDIS_ERR; } - server.bgsavechildpid = -1; + server.rdb_child_pid = -1; + server.rdb_save_time_last = time(NULL)-server.rdb_save_time_start; + server.rdb_save_time_start = -1; /* Possibly there are slaves waiting for a BGSAVE in order to be served * (the first stage of SYNC is a bulk transfer of dump.rdb) */ updateSlavesWaitingBgsave(exitcode == 0 ? REDIS_OK : REDIS_ERR); } + +void saveCommand(redisClient *c) { + if (server.rdb_child_pid != -1) { + addReplyError(c,"Background save already in progress"); + return; + } + if (rdbSave(server.rdb_filename) == REDIS_OK) { + addReply(c,shared.ok); + } else { + addReply(c,shared.err); + } +} + +void bgsaveCommand(redisClient *c) { + if (server.rdb_child_pid != -1) { + addReplyError(c,"Background save already in progress"); + } else if (server.aof_child_pid != -1) { + addReplyError(c,"Can't BGSAVE while AOF log rewriting is in progress"); + } else if (rdbSaveBackground(server.rdb_filename) == REDIS_OK) { + addReplyStatus(c,"Background saving started"); + } else { + addReply(c,shared.err); + } +}