#include "redis.h" #include "lzf.h" /* LZF compression library */ #include #include #include #include #include #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; return len; } int rdbSaveType(FILE *fp, unsigned char type) { return rdbWriteRaw(fp,&type,1); } int rdbSaveTime(FILE *fp, time_t t) { int32_t t32 = (int32_t) t; return rdbWriteRaw(fp,&t32,4); } /* check rdbLoadLen() comments for more info */ int rdbSaveLen(FILE *fp, uint32_t len) { unsigned char buf[2]; int 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; 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; nwritten = 2; } else { /* Save a 32 bit len */ buf[0] = (REDIS_RDB_32BITLEN<<6); if (rdbWriteRaw(fp,buf,1) == -1) return -1; len = htonl(len); if (rdbWriteRaw(fp,&len,4) == -1) 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. */ 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; return 2; } else if (value >= -(1<<15) && value <= (1<<15)-1) { enc[0] = (REDIS_RDB_ENCVAL<<6)|REDIS_RDB_ENC_INT16; enc[1] = value&0xFF; enc[2] = (value>>8)&0xFF; return 3; } else if (value >= -((long long)1<<31) && value <= ((long long)1<<31)-1) { enc[0] = (REDIS_RDB_ENCVAL<<6)|REDIS_RDB_ENC_INT32; enc[1] = value&0xFF; enc[2] = (value>>8)&0xFF; enc[3] = (value>>16)&0xFF; enc[4] = (value>>24)&0xFF; return 5; } else { return 0; } } /* 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 */ int rdbTryIntegerEncoding(char *s, size_t len, unsigned char *enc) { long long value; char *endptr, buf[32]; /* Check if it's possible to encode this value as a number */ value = strtoll(s, &endptr, 10); if (endptr[0] != '\0') return 0; ll2string(buf,32,value); /* If the number converted back into a string is not identical * then it's not possible to encode the string as integer */ if (strlen(buf) != len || memcmp(buf,s,len)) return 0; return rdbEncodeInteger(value,enc); } int rdbSaveLzfStringObject(FILE *fp, unsigned char *s, size_t len) { size_t comprlen, outlen; unsigned char byte; int n, nwritten = 0; void *out; /* We require at least four bytes compression for this to be worth it */ if (len <= 4) return 0; outlen = len-4; if ((out = zmalloc(outlen+1)) == NULL) return 0; comprlen = lzf_compress(s, len, out, outlen); if (comprlen == 0) { zfree(out); return 0; } /* 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; nwritten += n; if ((n = rdbSaveLen(fp,comprlen)) == -1) goto writeerr; nwritten += n; if ((n = rdbSaveLen(fp,len)) == -1) goto writeerr; nwritten += n; if ((n = rdbWriteRaw(fp,out,comprlen)) == -1) goto writeerr; nwritten += n; zfree(out); return nwritten; writeerr: zfree(out); return -1; } /* Save a string objet as [len][data] on disk. If the object is a string * representation of an integer value we try to save it in a special form */ int rdbSaveRawString(FILE *fp, unsigned char *s, size_t len) { int enclen; int n, nwritten = 0; /* Try integer encoding */ if (len <= 11) { unsigned char buf[5]; if ((enclen = rdbTryIntegerEncoding((char*)s,len,buf)) > 0) { if (rdbWriteRaw(fp,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 (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; nwritten += n; if (len > 0) { if (rdbWriteRaw(fp,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) { unsigned char buf[32]; int n, nwritten = 0; int enclen = rdbEncodeInteger(value,buf); if (enclen > 0) { return rdbWriteRaw(fp,buf,enclen); } else { /* Encode as string */ enclen = ll2string((char*)buf,32,value); redisAssert(enclen < 32); if ((n = rdbSaveLen(fp,enclen)) == -1) return -1; nwritten += n; if ((n = rdbWriteRaw(fp,buf,enclen)) == -1) return -1; nwritten += n; } return nwritten; } /* Like rdbSaveStringObjectRaw() but handle encoded objects */ int rdbSaveStringObject(FILE *fp, 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); } else { redisAssert(obj->encoding == REDIS_ENCODING_RAW); return rdbSaveRawString(fp,obj->ptr,sdslen(obj->ptr)); } } /* Save a double value. Doubles are saved as strings prefixed by an unsigned * 8 bit integer specifing the length of the representation. * This 8 bit integer has special values in order to specify the following * conditions: * 253: not a number * 254: + inf * 255: - inf */ int rdbSaveDoubleValue(FILE *fp, double val) { unsigned char buf[128]; int len; if (isnan(val)) { buf[0] = 253; len = 1; } else if (!isfinite(val)) { len = 1; buf[0] = (val < 0) ? 255 : 254; } else { #if (DBL_MANT_DIG >= 52) && (LLONG_MAX == 0x7fffffffffffffffLL) /* Check if the float is in a safe range to be casted into a * long long. We are assuming that long long is 64 bit here. * Also we are assuming that there are no implementations around where * double has precision < 52 bit. * * Under this assumptions we test if a double is inside an interval * where casting to long long is safe. Then using two castings we * make sure the decimal part is zero. If all this is true we use * integer printing function that is much faster. */ double min = -4503599627370495; /* (2^52)-1 */ double max = 4503599627370496; /* -(2^52) */ if (val > min && val < max && val == ((double)((long long)val))) ll2string((char*)buf+1,sizeof(buf),(long long)val); else #endif snprintf((char*)buf+1,sizeof(buf)-1,"%.17g",val); buf[0] = strlen((char*)buf+1); len = buf[0]+1; } return rdbWriteRaw(fp,buf,len); } /* Save a Redis object. Returns -1 on error, 0 on success. */ int rdbSaveObject(FILE *fp, robj *o) { int n, nwritten = 0; if (o->type == REDIS_STRING) { /* Save a string value */ if ((n = rdbSaveStringObject(fp,o)) == -1) return -1; nwritten += n; } else if (o->type == REDIS_LIST) { /* Save a list value */ if (o->encoding == REDIS_ENCODING_ZIPLIST) { size_t l = ziplistBlobLen((unsigned char*)o->ptr); if ((n = rdbSaveRawString(fp,o->ptr,l)) == -1) return -1; nwritten += n; } else if (o->encoding == REDIS_ENCODING_LINKEDLIST) { list *list = o->ptr; listIter li; listNode *ln; if ((n = rdbSaveLen(fp,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; nwritten += n; } } else { redisPanic("Unknown list encoding"); } } else if (o->type == REDIS_SET) { /* Save a set value */ if (o->encoding == REDIS_ENCODING_HT) { dict *set = o->ptr; dictIterator *di = dictGetIterator(set); dictEntry *de; if ((n = rdbSaveLen(fp,dictSize(set))) == -1) return -1; nwritten += n; while((de = dictNext(di)) != NULL) { robj *eleobj = dictGetEntryKey(de); if ((n = rdbSaveStringObject(fp,eleobj)) == -1) return -1; nwritten += n; } dictReleaseIterator(di); } else if (o->encoding == REDIS_ENCODING_INTSET) { size_t l = intsetBlobLen((intset*)o->ptr); if ((n = rdbSaveRawString(fp,o->ptr,l)) == -1) return -1; nwritten += n; } else { redisPanic("Unknown set encoding"); } } else if (o->type == REDIS_ZSET) { /* Save a sorted set value */ if (o->encoding == REDIS_ENCODING_ZIPLIST) { size_t l = ziplistBlobLen((unsigned char*)o->ptr); if ((n = rdbSaveRawString(fp,o->ptr,l)) == -1) return -1; nwritten += n; } else if (o->encoding == REDIS_ENCODING_SKIPLIST) { 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); if ((n = rdbSaveStringObject(fp,eleobj)) == -1) return -1; nwritten += n; if ((n = rdbSaveDoubleValue(fp,*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_ZIPMAP) { size_t l = zipmapBlobLen((unsigned char*)o->ptr); if ((n = rdbSaveRawString(fp,o->ptr,l)) == -1) return -1; nwritten += n; } else { dictIterator *di = dictGetIterator(o->ptr); dictEntry *de; if ((n = rdbSaveLen(fp,dictSize((dict*)o->ptr))) == -1) return -1; nwritten += n; while((de = dictNext(di)) != NULL) { robj *key = dictGetEntryKey(de); robj *val = dictGetEntryVal(de); if ((n = rdbSaveStringObject(fp,key)) == -1) return -1; nwritten += n; if ((n = rdbSaveStringObject(fp,val)) == -1) return -1; nwritten += n; } dictReleaseIterator(di); } } else { redisPanic("Unknown object type"); } return nwritten; } /* Return the length the object will have on disk if saved with * the rdbSaveObject() function. Currently we use a trick to get * this length with very little changes to the code. In the future * we could switch to a faster solution. */ off_t rdbSavedObjectLen(robj *o) { int len = rdbSaveObject(NULL,o); redisAssert(len != -1); return len; } /* 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(FILE *fp, robj *key, robj *val, time_t expiretime, time_t now) { int vtype; /* Save the expire time */ if (expiretime != -1) { /* If this key is already expired skip it */ if (expiretime < now) return 0; if (rdbSaveType(fp,REDIS_EXPIRETIME) == -1) return -1; if (rdbSaveTime(fp,expiretime) == -1) return -1; } /* Fix the object type if needed, to support saving zipmaps, ziplists, * and intsets, directly as blobs of bytes: they are already serialized. */ vtype = val->type; if (vtype == REDIS_HASH && val->encoding == REDIS_ENCODING_ZIPMAP) vtype = REDIS_HASH_ZIPMAP; else if (vtype == REDIS_LIST && val->encoding == REDIS_ENCODING_ZIPLIST) vtype = REDIS_LIST_ZIPLIST; else if (vtype == REDIS_SET && val->encoding == REDIS_ENCODING_INTSET) vtype = REDIS_SET_INTSET; else if (vtype == REDIS_ZSET && val->encoding == REDIS_ENCODING_ZIPLIST) vtype = REDIS_ZSET_ZIPLIST; /* Save type, key, value */ if (rdbSaveType(fp,vtype) == -1) return -1; if (rdbSaveStringObject(fp,key) == -1) return -1; if (rdbSaveObject(fp,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]; int j; time_t now = time(NULL); snprintf(tmpfile,256,"temp-%d.rdb", (int) getpid()); fp = fopen(tmpfile,"w"); if (!fp) { redisLog(REDIS_WARNING, "Failed opening .rdb for saving: %s", strerror(errno)); return REDIS_ERR; } if (fwrite("REDIS0002",9,1,fp) == 0) goto werr; for (j = 0; j < server.dbnum; j++) { redisDb *db = server.db+j; dict *d = db->dict; if (dictSize(d) == 0) continue; 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; /* Iterate this DB writing every entry */ while((de = dictNext(di)) != NULL) { sds keystr = dictGetEntryKey(de); robj key, *o = dictGetEntryVal(de); time_t expire; initStaticStringObject(key,keystr); expire = getExpire(db,&key); if (rdbSaveKeyValuePair(fp,&key,o,expire,now) == -1) goto werr; } dictReleaseIterator(di); } /* EOF opcode */ if (rdbSaveType(fp,REDIS_EOF) == -1) goto werr; /* Make sure data will not remain on the OS's output buffers */ fflush(fp); fsync(fileno(fp)); fclose(fp); /* Use RENAME to make sure the DB file is changed atomically only * if the generate DB file is ok. */ if (rename(tmpfile,filename) == -1) { redisLog(REDIS_WARNING,"Error moving temp DB file on the final destination: %s", strerror(errno)); unlink(tmpfile); return REDIS_ERR; } redisLog(REDIS_NOTICE,"DB saved on disk"); server.dirty = 0; server.lastsave = time(NULL); return REDIS_OK; werr: fclose(fp); unlink(tmpfile); redisLog(REDIS_WARNING,"Write error saving DB on disk: %s", strerror(errno)); if (di) dictReleaseIterator(di); return REDIS_ERR; } int rdbSaveBackground(char *filename) { pid_t childpid; long long start; if (server.bgsavechildpid != -1) return REDIS_ERR; server.dirty_before_bgsave = server.dirty; start = ustime(); if ((childpid = fork()) == 0) { int retval; /* Child */ if (server.ipfd > 0) close(server.ipfd); if (server.sofd > 0) close(server.sofd); retval = rdbSave(filename); _exit((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; updateDictResizePolicy(); return REDIS_OK; } return REDIS_OK; /* unreached */ } void rdbRemoveTempFile(pid_t childpid) { char tmpfile[256]; snprintf(tmpfile,256,"temp-%d.rdb", (int) 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 *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) { /* Read string value */ if ((o = rdbLoadEncodedStringObject(fp)) == NULL) return NULL; o = tryObjectEncoding(o); } else if (type == REDIS_LIST) { /* Read list value */ if ((len = rdbLoadLen(fp,NULL)) == REDIS_RDB_LENERR) return NULL; /* Use a real list when there are too many entries */ if (len > server.list_max_ziplist_entries) { o = createListObject(); } else { o = createZiplistObject(); } /* Load every single element of the list */ while(len--) { if ((ele = rdbLoadEncodedStringObject(fp)) == NULL) return NULL; /* If we are using a ziplist and the value is too big, convert * the object to a real list. */ if (o->encoding == REDIS_ENCODING_ZIPLIST && ele->encoding == REDIS_ENCODING_RAW && sdslen(ele->ptr) > server.list_max_ziplist_value) listTypeConvert(o,REDIS_ENCODING_LINKEDLIST); if (o->encoding == REDIS_ENCODING_ZIPLIST) { dec = getDecodedObject(ele); o->ptr = ziplistPush(o->ptr,dec->ptr,sdslen(dec->ptr),REDIS_TAIL); decrRefCount(dec); decrRefCount(ele); } else { ele = tryObjectEncoding(ele); listAddNodeTail(o->ptr,ele); } } } else if (type == REDIS_SET) { /* Read list/set value */ if ((len = rdbLoadLen(fp,NULL)) == REDIS_RDB_LENERR) return NULL; /* Use a regular set when there are too many entries. */ if (len > server.set_max_intset_entries) { o = createSetObject(); /* It's faster to expand the dict to the right size asap in order * to avoid rehashing */ if (len > DICT_HT_INITIAL_SIZE) dictExpand(o->ptr,len); } else { o = createIntsetObject(); } /* Load every single element of the list/set */ for (i = 0; i < len; i++) { long long llval; if ((ele = rdbLoadEncodedStringObject(fp)) == NULL) return NULL; ele = tryObjectEncoding(ele); if (o->encoding == REDIS_ENCODING_INTSET) { /* Fetch integer value from element */ if (isObjectRepresentableAsLongLong(ele,&llval) == REDIS_OK) { o->ptr = intsetAdd(o->ptr,llval,NULL); } else { setTypeConvert(o,REDIS_ENCODING_HT); dictExpand(o->ptr,len); } } /* This will also be called when the set was just converted * to regular hashtable encoded set */ if (o->encoding == REDIS_ENCODING_HT) { dictAdd((dict*)o->ptr,ele,NULL); } else { decrRefCount(ele); } } } else if (type == REDIS_ZSET) { /* Read list/set value */ size_t zsetlen; size_t maxelelen = 0; zset *zs; if ((zsetlen = rdbLoadLen(fp,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; ele = tryObjectEncoding(ele); if (rdbLoadDoubleValue(fp,&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 */ } /* 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 (type == REDIS_HASH) { size_t hashlen; if ((hashlen = rdbLoadLen(fp,NULL)) == 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))) { convertToRealHash(o); } 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); } } } else if (type == REDIS_HASH_ZIPMAP || type == REDIS_LIST_ZIPLIST || type == REDIS_SET_INTSET || type == REDIS_ZSET_ZIPLIST) { robj *aux = rdbLoadStringObject(fp); 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(type) { case REDIS_HASH_ZIPMAP: o->type = REDIS_HASH; o->encoding = REDIS_ENCODING_ZIPMAP; if (zipmapLen(o->ptr) > server.hash_max_zipmap_entries) convertToRealHash(o); break; case REDIS_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_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_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; default: redisPanic("Unknown encoding"); break; } } else { redisPanic("Unknown object type"); } return o; } /* Mark that we are loading in the global state and setup the fields * needed to provide loading stats. */ void startLoading(FILE *fp) { struct stat sb; /* Load the DB */ server.loading = 1; server.loading_start_time = time(NULL); if (fstat(fileno(fp), &sb) == -1) { server.loading_total_bytes = 1; /* just to avoid division by zero */ } else { server.loading_total_bytes = sb.st_size; } } /* Refresh the loading progress info */ void loadingProgress(off_t pos) { server.loading_loaded_bytes = pos; } /* Loading finished */ void stopLoading(void) { server.loading = 0; } int rdbLoad(char *filename) { FILE *fp; uint32_t dbid; int type, rdbver; redisDb *db = server.db+0; char buf[1024]; time_t expiretime, now = time(NULL); long loops = 0; fp = fopen(filename,"r"); if (!fp) return REDIS_ERR; if (fread(buf,9,1,fp) == 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"); return REDIS_ERR; } rdbver = atoi(buf+5); if (rdbver < 1 || rdbver > 2) { fclose(fp); redisLog(REDIS_WARNING,"Can't handle RDB format version %d",rdbver); return REDIS_ERR; } startLoading(fp); while(1) { robj *key, *val; expiretime = -1; /* Serve the clients from time to time */ if (!(loops++ % 1000)) { loadingProgress(ftello(fp)); 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 == REDIS_EOF) break; /* Handle SELECT DB opcode as a special case */ if (type == REDIS_SELECTDB) { if ((dbid = rdbLoadLen(fp,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); exit(1); } db = server.db+dbid; continue; } /* Read key */ if ((key = rdbLoadStringObject(fp)) == NULL) goto eoferr; /* Read value */ if ((val = rdbLoadObject(type,fp)) == NULL) goto eoferr; /* Check if the key already expired */ if (expiretime != -1 && expiretime < now) { decrRefCount(key); decrRefCount(val); continue; } /* Add the new object in the hash table */ dbAdd(db,key,val); /* Set the expire time if needed */ if (expiretime != -1) setExpire(db,key,expiretime); decrRefCount(key); } fclose(fp); stopLoading(); return REDIS_OK; eoferr: /* unexpected end of file is handled here with a fatal exit */ redisLog(REDIS_WARNING,"Short read or OOM loading DB. Unrecoverable error, aborting now."); exit(1); return REDIS_ERR; /* Just to avoid warning */ } /* A background saving child (BGSAVE) terminated its work. Handle this. */ 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); } else if (!bysignal && exitcode != 0) { redisLog(REDIS_WARNING, "Background saving error"); } else { redisLog(REDIS_WARNING, "Background saving terminated by signal %d", bysignal); rdbRemoveTempFile(server.bgsavechildpid); } server.bgsavechildpid = -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.bgsavechildpid != -1) { addReplyError(c,"Background save already in progress"); return; } if (rdbSave(server.dbfilename) == REDIS_OK) { addReply(c,shared.ok); } else { addReply(c,shared.err); } } void bgsaveCommand(redisClient *c) { if (server.bgsavechildpid != -1) { addReplyError(c,"Background save already in progress"); } else if (server.bgrewritechildpid != -1) { addReplyError(c,"Can't BGSAVE while AOF log rewriting is in progress"); } else if (rdbSaveBackground(server.dbfilename) == REDIS_OK) { addReplyStatus(c,"Background saving started"); } else { addReply(c,shared.err); } }