#include <arpa/inet.h>
#include <sys/stat.h>
+/* 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) {
- if (fwrite(&type,1,1,fp) == 0) return -1;
- return 1; /* bytes written */
+ return rdbWriteRaw(fp,&type,1);
}
int rdbSaveTime(FILE *fp, time_t t) {
int32_t t32 = (int32_t) t;
- if (fwrite(&t32,4,1,fp) == 0) return -1;
- return 4; /* bytes written */
+ return rdbWriteRaw(fp,&t32,4);
}
/* check rdbLoadLen() comments for more info */
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;
+ 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 (fwrite(buf,2,1,fp) == 0) return -1;
+ if (rdbWriteRaw(fp,buf,2) == -1) return -1;
nwritten = 2;
} else {
/* Save a 32 bit len */
buf[0] = (REDIS_RDB_32BITLEN<<6);
- if (fwrite(buf,1,1,fp) == 0) return -1;
+ if (rdbWriteRaw(fp,buf,1) == -1) return -1;
len = htonl(len);
- if (fwrite(&len,4,1,fp) == 0) return -1;
+ if (rdbWriteRaw(fp,&len,4) == -1) return -1;
nwritten = 1+4;
}
return nwritten;
}
/* 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;
- nwritten += 1;
+ 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 (fwrite(out,comprlen,1,fp) == 0) goto writeerr;
- nwritten += comprlen;
+ if ((n = rdbWriteRaw(fp,out,comprlen)) == -1) goto writeerr;
+ nwritten += n;
zfree(out);
return nwritten;
if (len <= 11) {
unsigned char buf[5];
if ((enclen = rdbTryIntegerEncoding((char*)s,len,buf)) > 0) {
- if (fwrite(buf,enclen,1,fp) == 0) return -1;
+ if (rdbWriteRaw(fp,buf,enclen) == -1) return -1;
return enclen;
}
}
if ((n = rdbSaveLen(fp,len)) == -1) return -1;
nwritten += n;
if (len > 0) {
- if (fwrite(s,len,1,fp) == 0) return -1;
+ if (rdbWriteRaw(fp,s,len) == -1) return -1;
nwritten += len;
}
return nwritten;
int n, nwritten = 0;
int enclen = rdbEncodeInteger(value,buf);
if (enclen > 0) {
- if (fwrite(buf,enclen,1,fp) == 0) return -1;
- nwritten = enclen;
+ 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 (fwrite(buf,enclen,1,fp) == 0) return -1;
- nwritten += enclen;
+ if ((n = rdbWriteRaw(fp,buf,enclen)) == -1) return -1;
+ nwritten += n;
}
return nwritten;
}
buf[0] = strlen((char*)buf+1);
len = buf[0]+1;
}
- if (fwrite(buf,len,1,fp) == 0) return -1;
- return len;
+ return rdbWriteRaw(fp,buf,len);
}
/* Save a Redis object. */
* 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) {
- int nwritten;
- if (fp == NULL) fp = server.devnull;
- rewind(fp);
-
- /* Determining the saved length of an object should never return -1 */
- redisAssert((nwritten = rdbSaveObject(fp,o)) != -1);
- return nwritten;
+off_t rdbSavedObjectLen(robj *o) {
+ int len = rdbSaveObject(NULL,o);
+ redisAssert(len != -1);
+ return len;
}
-/* 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 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, redisDb *db, robj *key, robj *val,
+ time_t now)
+{
+ time_t expiretime;
+
+ expiretime = getExpire(db,key);
+
+ /* 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;
+ }
+ /* Save type, key, value */
+ if (rdbSaveType(fp,val->type) == -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 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();
+ /* FIXME: implement .rdb save for disk store properly */
+ redisAssert(server.ds_enabled == 0);
snprintf(tmpfile,256,"temp-%d.rdb", (int) getpid());
fp = fopen(tmpfile,"w");
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);
- }
+ if (rdbSaveKeyValuePair(fp,db,&key,o,now) == -1) goto werr;
}
dictReleaseIterator(di);
}
pid_t childpid;
if (server.bgsavechildpid != -1) return REDIS_ERR;
- if (server.vm_enabled) waitEmptyIOJobsQueue();
+ redisAssert(server.ds_enabled == 0);
server.dirty_before_bgsave = server.dirty;
if ((childpid = fork()) == 0) {
/* 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) {
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);
startLoading(fp);
while(1) {
robj *key, *val;
- int force_swapout;
-
expiretime = -1;
/* Serve the clients from time to time */
/* 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);
stopLoading();
projects / redis.git / blobdiff