#include "redis.h" #include "lzf.h" /* LZF compression library */ #include #include #include #include #include #include int rdbSaveType(FILE *fp, unsigned char type) { if (fwrite(&type,1,1,fp) == 0) return -1; return 0; } int rdbSaveTime(FILE *fp, time_t t) { int32_t t32 = (int32_t) t; if (fwrite(&t32,4,1,fp) == 0) return -1; return 0; } /* check rdbLoadLen() comments for more info */ int rdbSaveLen(FILE *fp, uint32_t len) { unsigned char buf[2]; if (len < (1<<6)) { /* Save a 6 bit len */ buf[0] = (len&0xFF)|(REDIS_RDB_6BITLEN<<6); if (fwrite(buf,1,1,fp) == 0) return -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 (fwrite(buf,2,1,fp) == 0) return -1; } else { /* Save a 32 bit len */ buf[0] = (REDIS_RDB_32BITLEN<<6); if (fwrite(buf,1,1,fp) == 0) return -1; len = htonl(len); if (fwrite(&len,4,1,fp) == 0) return -1; } return 0; } /* 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; 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 (fwrite(&byte,1,1,fp) == 0) goto writeerr; if (rdbSaveLen(fp,comprlen) == -1) goto writeerr; if (rdbSaveLen(fp,len) == -1) goto writeerr; if (fwrite(out,comprlen,1,fp) == 0) goto writeerr; zfree(out); return comprlen; 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 safe it in a special form */ int rdbSaveRawString(FILE *fp, unsigned char *s, size_t len) { int enclen; /* Try integer encoding */ if (len <= 11) { unsigned char buf[5]; if ((enclen = rdbTryIntegerEncoding((char*)s,len,buf)) > 0) { if (fwrite(buf,enclen,1,fp) == 0) return -1; return 0; } } /* Try LZF compression - under 20 bytes it's unable to compress even * aaaaaaaaaaaaaaaaaa so skip it */ if (server.rdbcompression && len > 20) { int retval; retval = rdbSaveLzfStringObject(fp,s,len); if (retval == -1) return -1; if (retval > 0) return 0; /* retval == 0 means data can't be compressed, save the old way */ } /* Store verbatim */ if (rdbSaveLen(fp,len) == -1) return -1; if (len && fwrite(s,len,1,fp) == 0) return -1; return 0; } /* 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 enclen = rdbEncodeInteger(value,buf); if (enclen > 0) { if (fwrite(buf,enclen,1,fp) == 0) return -1; } else { /* Encode as string */ enclen = ll2string((char*)buf,32,value); redisAssert(enclen < 32); if (rdbSaveLen(fp,enclen) == -1) return -1; if (fwrite(buf,enclen,1,fp) == 0) return -1; } return 0; } /* 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; } if (fwrite(buf,len,1,fp) == 0) return -1; return 0; } /* Save a Redis object. */ int rdbSaveObject(FILE *fp, robj *o) { if (o->type == REDIS_STRING) { /* Save a string value */ if (rdbSaveStringObject(fp,o) == -1) return -1; } 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; if (rdbSaveLen(fp,ziplistLen(o->ptr)) == -1) return -1; p = ziplistIndex(o->ptr,0); while(ziplistGet(p,&vstr,&vlen,&vlong)) { if (vstr) { if (rdbSaveRawString(fp,vstr,vlen) == -1) return -1; } else { if (rdbSaveLongLongAsStringObject(fp,vlong) == -1) return -1; } p = ziplistNext(o->ptr,p); } } else if (o->encoding == REDIS_ENCODING_LINKEDLIST) { list *list = o->ptr; listIter li; listNode *ln; if (rdbSaveLen(fp,listLength(list)) == -1) return -1; listRewind(list,&li); while((ln = listNext(&li))) { robj *eleobj = listNodeValue(ln); if (rdbSaveStringObject(fp,eleobj) == -1) return -1; } } 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 (rdbSaveLen(fp,dictSize(set)) == -1) return -1; while((de = dictNext(di)) != NULL) { robj *eleobj = dictGetEntryKey(de); if (rdbSaveStringObject(fp,eleobj) == -1) return -1; } dictReleaseIterator(di); } else if (o->encoding == REDIS_ENCODING_INTSET) { intset *is = o->ptr; int64_t llval; int i = 0; if (rdbSaveLen(fp,intsetLen(is)) == -1) return -1; while(intsetGet(is,i++,&llval)) { if (rdbSaveLongLongAsStringObject(fp,llval) == -1) return -1; } } 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 (rdbSaveLen(fp,dictSize(zs->dict)) == -1) return -1; while((de = dictNext(di)) != NULL) { robj *eleobj = dictGetEntryKey(de); double *score = dictGetEntryVal(de); if (rdbSaveStringObject(fp,eleobj) == -1) return -1; if (rdbSaveDoubleValue(fp,*score) == -1) return -1; } 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; if (rdbSaveLen(fp,count) == -1) return -1; while((p = zipmapNext(p,&key,&klen,&val,&vlen)) != NULL) { if (rdbSaveRawString(fp,key,klen) == -1) return -1; if (rdbSaveRawString(fp,val,vlen) == -1) return -1; } } else { dictIterator *di = dictGetIterator(o->ptr); dictEntry *de; if (rdbSaveLen(fp,dictSize((dict*)o->ptr)) == -1) return -1; while((de = dictNext(di)) != NULL) { robj *key = dictGetEntryKey(de); robj *val = dictGetEntryVal(de); if (rdbSaveStringObject(fp,key) == -1) return -1; if (rdbSaveStringObject(fp,val) == -1) return -1; } dictReleaseIterator(di); } } else { redisPanic("Unknown object type"); } return 0; } /* 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, FILE *fp) { if (fp == NULL) fp = server.devnull; rewind(fp); redisAssert(rdbSaveObject(fp,o) != 1); return ftello(fp); } /* Return the number of pages required to save this object in the swap file */ off_t rdbSavedObjectPages(robj *o, FILE *fp) { off_t bytes = rdbSavedObjectLen(o,fp); return (bytes+(server.vm_page_size-1))/server.vm_page_size; } /* 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); /* 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(); snprintf(tmpfile,256,"temp-%d.rdb", (int) getpid()); fp = fopen(tmpfile,"w"); if (!fp) { redisLog(REDIS_WARNING, "Failed saving the DB: %s", strerror(errno)); return REDIS_ERR; } if (fwrite("REDIS0001",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 = dictGetIterator(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 expiretime; 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); } } 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; if (server.bgsavechildpid != -1) return REDIS_ERR; if (server.vm_enabled) waitEmptyIOJobsQueue(); server.dirty_before_bgsave = server.dirty; if ((childpid = fork()) == 0) { /* Child */ if (server.vm_enabled) vmReopenSwapFile(); close(server.fd); if (rdbSave(filename) == REDIS_OK) { _exit(0); } else { _exit(1); } } else { /* Parent */ 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; 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; 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; 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 { redisPanic("Unknown object type"); } return o; } int rdbLoad(char *filename) { FILE *fp; uint32_t dbid; int type, retval, rdbver; int swap_all_values = 0; redisDb *db = server.db+0; char buf[1024]; time_t expiretime, now = time(NULL); 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) { fclose(fp); redisLog(REDIS_WARNING,"Can't handle RDB format version %d",rdbver); return REDIS_ERR; } while(1) { robj *key, *val; int force_swapout; expiretime = -1; /* 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 */ 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); } /* 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 */ } } fclose(fp); 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 statloc) { int exitcode = WEXITSTATUS(statloc); int bysignal = WIFSIGNALED(statloc); 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", WTERMSIG(statloc)); 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); }