#include "redis.h"
#include "lzf.h" /* LZF compression library */
#include <math.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/wait.h>
#include <arpa/inet.h>
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);
}