Commit af4e866d authored by antirez's avatar antirez
Browse files

Merged with split

parents b8b8501d 0f49d6b0
#include "redis.h"
/* ================================ MULTI/EXEC ============================== */
/* Client state initialization for MULTI/EXEC */
void initClientMultiState(redisClient *c) {
c->mstate.commands = NULL;
c->mstate.count = 0;
}
/* Release all the resources associated with MULTI/EXEC state */
void freeClientMultiState(redisClient *c) {
int j;
for (j = 0; j < c->mstate.count; j++) {
int i;
multiCmd *mc = c->mstate.commands+j;
for (i = 0; i < mc->argc; i++)
decrRefCount(mc->argv[i]);
zfree(mc->argv);
}
zfree(c->mstate.commands);
}
/* Add a new command into the MULTI commands queue */
void queueMultiCommand(redisClient *c, struct redisCommand *cmd) {
multiCmd *mc;
int j;
c->mstate.commands = zrealloc(c->mstate.commands,
sizeof(multiCmd)*(c->mstate.count+1));
mc = c->mstate.commands+c->mstate.count;
mc->cmd = cmd;
mc->argc = c->argc;
mc->argv = zmalloc(sizeof(robj*)*c->argc);
memcpy(mc->argv,c->argv,sizeof(robj*)*c->argc);
for (j = 0; j < c->argc; j++)
incrRefCount(mc->argv[j]);
c->mstate.count++;
}
void multiCommand(redisClient *c) {
if (c->flags & REDIS_MULTI) {
addReplySds(c,sdsnew("-ERR MULTI calls can not be nested\r\n"));
return;
}
c->flags |= REDIS_MULTI;
addReply(c,shared.ok);
}
void discardCommand(redisClient *c) {
if (!(c->flags & REDIS_MULTI)) {
addReplySds(c,sdsnew("-ERR DISCARD without MULTI\r\n"));
return;
}
freeClientMultiState(c);
initClientMultiState(c);
c->flags &= (~REDIS_MULTI);
unwatchAllKeys(c);
addReply(c,shared.ok);
}
/* Send a MULTI command to all the slaves and AOF file. Check the execCommand
* implememntation for more information. */
void execCommandReplicateMulti(redisClient *c) {
struct redisCommand *cmd;
robj *multistring = createStringObject("MULTI",5);
cmd = lookupCommand("multi");
if (server.appendonly)
feedAppendOnlyFile(cmd,c->db->id,&multistring,1);
if (listLength(server.slaves))
replicationFeedSlaves(server.slaves,c->db->id,&multistring,1);
decrRefCount(multistring);
}
void execCommand(redisClient *c) {
int j;
robj **orig_argv;
int orig_argc;
if (!(c->flags & REDIS_MULTI)) {
addReplySds(c,sdsnew("-ERR EXEC without MULTI\r\n"));
return;
}
/* Check if we need to abort the EXEC if some WATCHed key was touched.
* A failed EXEC will return a multi bulk nil object. */
if (c->flags & REDIS_DIRTY_CAS) {
freeClientMultiState(c);
initClientMultiState(c);
c->flags &= ~(REDIS_MULTI|REDIS_DIRTY_CAS);
unwatchAllKeys(c);
addReply(c,shared.nullmultibulk);
return;
}
/* Replicate a MULTI request now that we are sure the block is executed.
* This way we'll deliver the MULTI/..../EXEC block as a whole and
* both the AOF and the replication link will have the same consistency
* and atomicity guarantees. */
execCommandReplicateMulti(c);
/* Exec all the queued commands */
unwatchAllKeys(c); /* Unwatch ASAP otherwise we'll waste CPU cycles */
orig_argv = c->argv;
orig_argc = c->argc;
addReplySds(c,sdscatprintf(sdsempty(),"*%d\r\n",c->mstate.count));
for (j = 0; j < c->mstate.count; j++) {
c->argc = c->mstate.commands[j].argc;
c->argv = c->mstate.commands[j].argv;
call(c,c->mstate.commands[j].cmd);
}
c->argv = orig_argv;
c->argc = orig_argc;
freeClientMultiState(c);
initClientMultiState(c);
c->flags &= ~(REDIS_MULTI|REDIS_DIRTY_CAS);
/* Make sure the EXEC command is always replicated / AOF, since we
* always send the MULTI command (we can't know beforehand if the
* next operations will contain at least a modification to the DB). */
server.dirty++;
}
/* ===================== WATCH (CAS alike for MULTI/EXEC) ===================
*
* The implementation uses a per-DB hash table mapping keys to list of clients
* WATCHing those keys, so that given a key that is going to be modified
* we can mark all the associated clients as dirty.
*
* Also every client contains a list of WATCHed keys so that's possible to
* un-watch such keys when the client is freed or when UNWATCH is called. */
/* In the client->watched_keys list we need to use watchedKey structures
* as in order to identify a key in Redis we need both the key name and the
* DB */
typedef struct watchedKey {
robj *key;
redisDb *db;
} watchedKey;
/* Watch for the specified key */
void watchForKey(redisClient *c, robj *key) {
list *clients = NULL;
listIter li;
listNode *ln;
watchedKey *wk;
/* Check if we are already watching for this key */
listRewind(c->watched_keys,&li);
while((ln = listNext(&li))) {
wk = listNodeValue(ln);
if (wk->db == c->db && equalStringObjects(key,wk->key))
return; /* Key already watched */
}
/* This key is not already watched in this DB. Let's add it */
clients = dictFetchValue(c->db->watched_keys,key);
if (!clients) {
clients = listCreate();
dictAdd(c->db->watched_keys,key,clients);
incrRefCount(key);
}
listAddNodeTail(clients,c);
/* Add the new key to the lits of keys watched by this client */
wk = zmalloc(sizeof(*wk));
wk->key = key;
wk->db = c->db;
incrRefCount(key);
listAddNodeTail(c->watched_keys,wk);
}
/* Unwatch all the keys watched by this client. To clean the EXEC dirty
* flag is up to the caller. */
void unwatchAllKeys(redisClient *c) {
listIter li;
listNode *ln;
if (listLength(c->watched_keys) == 0) return;
listRewind(c->watched_keys,&li);
while((ln = listNext(&li))) {
list *clients;
watchedKey *wk;
/* Lookup the watched key -> clients list and remove the client
* from the list */
wk = listNodeValue(ln);
clients = dictFetchValue(wk->db->watched_keys, wk->key);
redisAssert(clients != NULL);
listDelNode(clients,listSearchKey(clients,c));
/* Kill the entry at all if this was the only client */
if (listLength(clients) == 0)
dictDelete(wk->db->watched_keys, wk->key);
/* Remove this watched key from the client->watched list */
listDelNode(c->watched_keys,ln);
decrRefCount(wk->key);
zfree(wk);
}
}
/* "Touch" a key, so that if this key is being WATCHed by some client the
* next EXEC will fail. */
void touchWatchedKey(redisDb *db, robj *key) {
list *clients;
listIter li;
listNode *ln;
if (dictSize(db->watched_keys) == 0) return;
clients = dictFetchValue(db->watched_keys, key);
if (!clients) return;
/* Mark all the clients watching this key as REDIS_DIRTY_CAS */
/* Check if we are already watching for this key */
listRewind(clients,&li);
while((ln = listNext(&li))) {
redisClient *c = listNodeValue(ln);
c->flags |= REDIS_DIRTY_CAS;
}
}
/* On FLUSHDB or FLUSHALL all the watched keys that are present before the
* flush but will be deleted as effect of the flushing operation should
* be touched. "dbid" is the DB that's getting the flush. -1 if it is
* a FLUSHALL operation (all the DBs flushed). */
void touchWatchedKeysOnFlush(int dbid) {
listIter li1, li2;
listNode *ln;
/* For every client, check all the waited keys */
listRewind(server.clients,&li1);
while((ln = listNext(&li1))) {
redisClient *c = listNodeValue(ln);
listRewind(c->watched_keys,&li2);
while((ln = listNext(&li2))) {
watchedKey *wk = listNodeValue(ln);
/* For every watched key matching the specified DB, if the
* key exists, mark the client as dirty, as the key will be
* removed. */
if (dbid == -1 || wk->db->id == dbid) {
if (dictFind(wk->db->dict, wk->key->ptr) != NULL)
c->flags |= REDIS_DIRTY_CAS;
}
}
}
}
void watchCommand(redisClient *c) {
int j;
if (c->flags & REDIS_MULTI) {
addReplySds(c,sdsnew("-ERR WATCH inside MULTI is not allowed\r\n"));
return;
}
for (j = 1; j < c->argc; j++)
watchForKey(c,c->argv[j]);
addReply(c,shared.ok);
}
void unwatchCommand(redisClient *c) {
unwatchAllKeys(c);
c->flags &= (~REDIS_DIRTY_CAS);
addReply(c,shared.ok);
}
#include "redis.h"
#include <sys/uio.h>
void *dupClientReplyValue(void *o) {
incrRefCount((robj*)o);
return o;
}
int listMatchObjects(void *a, void *b) {
return equalStringObjects(a,b);
}
redisClient *createClient(int fd) {
redisClient *c = zmalloc(sizeof(*c));
anetNonBlock(NULL,fd);
anetTcpNoDelay(NULL,fd);
if (!c) return NULL;
selectDb(c,0);
c->fd = fd;
c->querybuf = sdsempty();
c->argc = 0;
c->argv = NULL;
c->bulklen = -1;
c->multibulk = 0;
c->mbargc = 0;
c->mbargv = NULL;
c->sentlen = 0;
c->flags = 0;
c->lastinteraction = time(NULL);
c->authenticated = 0;
c->replstate = REDIS_REPL_NONE;
c->reply = listCreate();
listSetFreeMethod(c->reply,decrRefCount);
listSetDupMethod(c->reply,dupClientReplyValue);
c->blocking_keys = NULL;
c->blocking_keys_num = 0;
c->io_keys = listCreate();
c->watched_keys = listCreate();
listSetFreeMethod(c->io_keys,decrRefCount);
c->pubsub_channels = dictCreate(&setDictType,NULL);
c->pubsub_patterns = listCreate();
listSetFreeMethod(c->pubsub_patterns,decrRefCount);
listSetMatchMethod(c->pubsub_patterns,listMatchObjects);
if (aeCreateFileEvent(server.el, c->fd, AE_READABLE,
readQueryFromClient, c) == AE_ERR) {
freeClient(c);
return NULL;
}
listAddNodeTail(server.clients,c);
initClientMultiState(c);
return c;
}
void addReply(redisClient *c, robj *obj) {
if (listLength(c->reply) == 0 &&
(c->replstate == REDIS_REPL_NONE ||
c->replstate == REDIS_REPL_ONLINE) &&
aeCreateFileEvent(server.el, c->fd, AE_WRITABLE,
sendReplyToClient, c) == AE_ERR) return;
if (server.vm_enabled && obj->storage != REDIS_VM_MEMORY) {
obj = dupStringObject(obj);
obj->refcount = 0; /* getDecodedObject() will increment the refcount */
}
listAddNodeTail(c->reply,getDecodedObject(obj));
}
void addReplySds(redisClient *c, sds s) {
robj *o = createObject(REDIS_STRING,s);
addReply(c,o);
decrRefCount(o);
}
void addReplyDouble(redisClient *c, double d) {
char buf[128];
snprintf(buf,sizeof(buf),"%.17g",d);
addReplySds(c,sdscatprintf(sdsempty(),"$%lu\r\n%s\r\n",
(unsigned long) strlen(buf),buf));
}
void addReplyLongLong(redisClient *c, long long ll) {
char buf[128];
size_t len;
if (ll == 0) {
addReply(c,shared.czero);
return;
} else if (ll == 1) {
addReply(c,shared.cone);
return;
}
buf[0] = ':';
len = ll2string(buf+1,sizeof(buf)-1,ll);
buf[len+1] = '\r';
buf[len+2] = '\n';
addReplySds(c,sdsnewlen(buf,len+3));
}
void addReplyUlong(redisClient *c, unsigned long ul) {
char buf[128];
size_t len;
if (ul == 0) {
addReply(c,shared.czero);
return;
} else if (ul == 1) {
addReply(c,shared.cone);
return;
}
len = snprintf(buf,sizeof(buf),":%lu\r\n",ul);
addReplySds(c,sdsnewlen(buf,len));
}
void addReplyBulkLen(redisClient *c, robj *obj) {
size_t len, intlen;
char buf[128];
if (obj->encoding == REDIS_ENCODING_RAW) {
len = sdslen(obj->ptr);
} else {
long n = (long)obj->ptr;
/* Compute how many bytes will take this integer as a radix 10 string */
len = 1;
if (n < 0) {
len++;
n = -n;
}
while((n = n/10) != 0) {
len++;
}
}
buf[0] = '$';
intlen = ll2string(buf+1,sizeof(buf)-1,(long long)len);
buf[intlen+1] = '\r';
buf[intlen+2] = '\n';
addReplySds(c,sdsnewlen(buf,intlen+3));
}
void addReplyBulk(redisClient *c, robj *obj) {
addReplyBulkLen(c,obj);
addReply(c,obj);
addReply(c,shared.crlf);
}
/* In the CONFIG command we need to add vanilla C string as bulk replies */
void addReplyBulkCString(redisClient *c, char *s) {
if (s == NULL) {
addReply(c,shared.nullbulk);
} else {
robj *o = createStringObject(s,strlen(s));
addReplyBulk(c,o);
decrRefCount(o);
}
}
void acceptHandler(aeEventLoop *el, int fd, void *privdata, int mask) {
int cport, cfd;
char cip[128];
redisClient *c;
REDIS_NOTUSED(el);
REDIS_NOTUSED(mask);
REDIS_NOTUSED(privdata);
cfd = anetAccept(server.neterr, fd, cip, &cport);
if (cfd == AE_ERR) {
redisLog(REDIS_VERBOSE,"Accepting client connection: %s", server.neterr);
return;
}
redisLog(REDIS_VERBOSE,"Accepted %s:%d", cip, cport);
if ((c = createClient(cfd)) == NULL) {
redisLog(REDIS_WARNING,"Error allocating resoures for the client");
close(cfd); /* May be already closed, just ingore errors */
return;
}
/* If maxclient directive is set and this is one client more... close the
* connection. Note that we create the client instead to check before
* for this condition, since now the socket is already set in nonblocking
* mode and we can send an error for free using the Kernel I/O */
if (server.maxclients && listLength(server.clients) > server.maxclients) {
char *err = "-ERR max number of clients reached\r\n";
/* That's a best effort error message, don't check write errors */
if (write(c->fd,err,strlen(err)) == -1) {
/* Nothing to do, Just to avoid the warning... */
}
freeClient(c);
return;
}
server.stat_numconnections++;
}
static void freeClientArgv(redisClient *c) {
int j;
for (j = 0; j < c->argc; j++)
decrRefCount(c->argv[j]);
for (j = 0; j < c->mbargc; j++)
decrRefCount(c->mbargv[j]);
c->argc = 0;
c->mbargc = 0;
}
void freeClient(redisClient *c) {
listNode *ln;
/* Note that if the client we are freeing is blocked into a blocking
* call, we have to set querybuf to NULL *before* to call
* unblockClientWaitingData() to avoid processInputBuffer() will get
* called. Also it is important to remove the file events after
* this, because this call adds the READABLE event. */
sdsfree(c->querybuf);
c->querybuf = NULL;
if (c->flags & REDIS_BLOCKED)
unblockClientWaitingData(c);
/* UNWATCH all the keys */
unwatchAllKeys(c);
listRelease(c->watched_keys);
/* Unsubscribe from all the pubsub channels */
pubsubUnsubscribeAllChannels(c,0);
pubsubUnsubscribeAllPatterns(c,0);
dictRelease(c->pubsub_channels);
listRelease(c->pubsub_patterns);
/* Obvious cleanup */
aeDeleteFileEvent(server.el,c->fd,AE_READABLE);
aeDeleteFileEvent(server.el,c->fd,AE_WRITABLE);
listRelease(c->reply);
freeClientArgv(c);
close(c->fd);
/* Remove from the list of clients */
ln = listSearchKey(server.clients,c);
redisAssert(ln != NULL);
listDelNode(server.clients,ln);
/* Remove from the list of clients that are now ready to be restarted
* after waiting for swapped keys */
if (c->flags & REDIS_IO_WAIT && listLength(c->io_keys) == 0) {
ln = listSearchKey(server.io_ready_clients,c);
if (ln) {
listDelNode(server.io_ready_clients,ln);
server.vm_blocked_clients--;
}
}
/* Remove from the list of clients waiting for swapped keys */
while (server.vm_enabled && listLength(c->io_keys)) {
ln = listFirst(c->io_keys);
dontWaitForSwappedKey(c,ln->value);
}
listRelease(c->io_keys);
/* Master/slave cleanup */
if (c->flags & REDIS_SLAVE) {
if (c->replstate == REDIS_REPL_SEND_BULK && c->repldbfd != -1)
close(c->repldbfd);
list *l = (c->flags & REDIS_MONITOR) ? server.monitors : server.slaves;
ln = listSearchKey(l,c);
redisAssert(ln != NULL);
listDelNode(l,ln);
}
if (c->flags & REDIS_MASTER) {
server.master = NULL;
server.replstate = REDIS_REPL_CONNECT;
}
/* Release memory */
zfree(c->argv);
zfree(c->mbargv);
freeClientMultiState(c);
zfree(c);
}
#define GLUEREPLY_UP_TO (1024)
static void glueReplyBuffersIfNeeded(redisClient *c) {
int copylen = 0;
char buf[GLUEREPLY_UP_TO];
listNode *ln;
listIter li;
robj *o;
listRewind(c->reply,&li);
while((ln = listNext(&li))) {
int objlen;
o = ln->value;
objlen = sdslen(o->ptr);
if (copylen + objlen <= GLUEREPLY_UP_TO) {
memcpy(buf+copylen,o->ptr,objlen);
copylen += objlen;
listDelNode(c->reply,ln);
} else {
if (copylen == 0) return;
break;
}
}
/* Now the output buffer is empty, add the new single element */
o = createObject(REDIS_STRING,sdsnewlen(buf,copylen));
listAddNodeHead(c->reply,o);
}
void sendReplyToClient(aeEventLoop *el, int fd, void *privdata, int mask) {
redisClient *c = privdata;
int nwritten = 0, totwritten = 0, objlen;
robj *o;
REDIS_NOTUSED(el);
REDIS_NOTUSED(mask);
/* Use writev() if we have enough buffers to send */
if (!server.glueoutputbuf &&
listLength(c->reply) > REDIS_WRITEV_THRESHOLD &&
!(c->flags & REDIS_MASTER))
{
sendReplyToClientWritev(el, fd, privdata, mask);
return;
}
while(listLength(c->reply)) {
if (server.glueoutputbuf && listLength(c->reply) > 1)
glueReplyBuffersIfNeeded(c);
o = listNodeValue(listFirst(c->reply));
objlen = sdslen(o->ptr);
if (objlen == 0) {
listDelNode(c->reply,listFirst(c->reply));
continue;
}
if (c->flags & REDIS_MASTER) {
/* Don't reply to a master */
nwritten = objlen - c->sentlen;
} else {
nwritten = write(fd, ((char*)o->ptr)+c->sentlen, objlen - c->sentlen);
if (nwritten <= 0) break;
}
c->sentlen += nwritten;
totwritten += nwritten;
/* If we fully sent the object on head go to the next one */
if (c->sentlen == objlen) {
listDelNode(c->reply,listFirst(c->reply));
c->sentlen = 0;
}
/* Note that we avoid to send more thank REDIS_MAX_WRITE_PER_EVENT
* bytes, in a single threaded server it's a good idea to serve
* other clients as well, even if a very large request comes from
* super fast link that is always able to accept data (in real world
* scenario think about 'KEYS *' against the loopback interfae) */
if (totwritten > REDIS_MAX_WRITE_PER_EVENT) break;
}
if (nwritten == -1) {
if (errno == EAGAIN) {
nwritten = 0;
} else {
redisLog(REDIS_VERBOSE,
"Error writing to client: %s", strerror(errno));
freeClient(c);
return;
}
}
if (totwritten > 0) c->lastinteraction = time(NULL);
if (listLength(c->reply) == 0) {
c->sentlen = 0;
aeDeleteFileEvent(server.el,c->fd,AE_WRITABLE);
}
}
void sendReplyToClientWritev(aeEventLoop *el, int fd, void *privdata, int mask)
{
redisClient *c = privdata;
int nwritten = 0, totwritten = 0, objlen, willwrite;
robj *o;
struct iovec iov[REDIS_WRITEV_IOVEC_COUNT];
int offset, ion = 0;
REDIS_NOTUSED(el);
REDIS_NOTUSED(mask);
listNode *node;
while (listLength(c->reply)) {
offset = c->sentlen;
ion = 0;
willwrite = 0;
/* fill-in the iov[] array */
for(node = listFirst(c->reply); node; node = listNextNode(node)) {
o = listNodeValue(node);
objlen = sdslen(o->ptr);
if (totwritten + objlen - offset > REDIS_MAX_WRITE_PER_EVENT)
break;
if(ion == REDIS_WRITEV_IOVEC_COUNT)
break; /* no more iovecs */
iov[ion].iov_base = ((char*)o->ptr) + offset;
iov[ion].iov_len = objlen - offset;
willwrite += objlen - offset;
offset = 0; /* just for the first item */
ion++;
}
if(willwrite == 0)
break;
/* write all collected blocks at once */
if((nwritten = writev(fd, iov, ion)) < 0) {
if (errno != EAGAIN) {
redisLog(REDIS_VERBOSE,
"Error writing to client: %s", strerror(errno));
freeClient(c);
return;
}
break;
}
totwritten += nwritten;
offset = c->sentlen;
/* remove written robjs from c->reply */
while (nwritten && listLength(c->reply)) {
o = listNodeValue(listFirst(c->reply));
objlen = sdslen(o->ptr);
if(nwritten >= objlen - offset) {
listDelNode(c->reply, listFirst(c->reply));
nwritten -= objlen - offset;
c->sentlen = 0;
} else {
/* partial write */
c->sentlen += nwritten;
break;
}
offset = 0;
}
}
if (totwritten > 0)
c->lastinteraction = time(NULL);
if (listLength(c->reply) == 0) {
c->sentlen = 0;
aeDeleteFileEvent(server.el,c->fd,AE_WRITABLE);
}
}
/* resetClient prepare the client to process the next command */
void resetClient(redisClient *c) {
freeClientArgv(c);
c->bulklen = -1;
c->multibulk = 0;
}
void closeTimedoutClients(void) {
redisClient *c;
listNode *ln;
time_t now = time(NULL);
listIter li;
listRewind(server.clients,&li);
while ((ln = listNext(&li)) != NULL) {
c = listNodeValue(ln);
if (server.maxidletime &&
!(c->flags & REDIS_SLAVE) && /* no timeout for slaves */
!(c->flags & REDIS_MASTER) && /* no timeout for masters */
dictSize(c->pubsub_channels) == 0 && /* no timeout for pubsub */
listLength(c->pubsub_patterns) == 0 &&
(now - c->lastinteraction > server.maxidletime))
{
redisLog(REDIS_VERBOSE,"Closing idle client");
freeClient(c);
} else if (c->flags & REDIS_BLOCKED) {
if (c->blockingto != 0 && c->blockingto < now) {
addReply(c,shared.nullmultibulk);
unblockClientWaitingData(c);
}
}
}
}
void processInputBuffer(redisClient *c) {
again:
/* Before to process the input buffer, make sure the client is not
* waitig for a blocking operation such as BLPOP. Note that the first
* iteration the client is never blocked, otherwise the processInputBuffer
* would not be called at all, but after the execution of the first commands
* in the input buffer the client may be blocked, and the "goto again"
* will try to reiterate. The following line will make it return asap. */
if (c->flags & REDIS_BLOCKED || c->flags & REDIS_IO_WAIT) return;
if (c->bulklen == -1) {
/* Read the first line of the query */
char *p = strchr(c->querybuf,'\n');
size_t querylen;
if (p) {
sds query, *argv;
int argc, j;
query = c->querybuf;
c->querybuf = sdsempty();
querylen = 1+(p-(query));
if (sdslen(query) > querylen) {
/* leave data after the first line of the query in the buffer */
c->querybuf = sdscatlen(c->querybuf,query+querylen,sdslen(query)-querylen);
}
*p = '\0'; /* remove "\n" */
if (*(p-1) == '\r') *(p-1) = '\0'; /* and "\r" if any */
sdsupdatelen(query);
/* Now we can split the query in arguments */
argv = sdssplitlen(query,sdslen(query)," ",1,&argc);
sdsfree(query);
if (c->argv) zfree(c->argv);
c->argv = zmalloc(sizeof(robj*)*argc);
for (j = 0; j < argc; j++) {
if (sdslen(argv[j])) {
c->argv[c->argc] = createObject(REDIS_STRING,argv[j]);
c->argc++;
} else {
sdsfree(argv[j]);
}
}
zfree(argv);
if (c->argc) {
/* Execute the command. If the client is still valid
* after processCommand() return and there is something
* on the query buffer try to process the next command. */
if (processCommand(c) && sdslen(c->querybuf)) goto again;
} else {
/* Nothing to process, argc == 0. Just process the query
* buffer if it's not empty or return to the caller */
if (sdslen(c->querybuf)) goto again;
}
return;
} else if (sdslen(c->querybuf) >= REDIS_REQUEST_MAX_SIZE) {
redisLog(REDIS_VERBOSE, "Client protocol error");
freeClient(c);
return;
}
} else {
/* Bulk read handling. Note that if we are at this point
the client already sent a command terminated with a newline,
we are reading the bulk data that is actually the last
argument of the command. */
int qbl = sdslen(c->querybuf);
if (c->bulklen <= qbl) {
/* Copy everything but the final CRLF as final argument */
c->argv[c->argc] = createStringObject(c->querybuf,c->bulklen-2);
c->argc++;
c->querybuf = sdsrange(c->querybuf,c->bulklen,-1);
/* Process the command. If the client is still valid after
* the processing and there is more data in the buffer
* try to parse it. */
if (processCommand(c) && sdslen(c->querybuf)) goto again;
return;
}
}
}
void readQueryFromClient(aeEventLoop *el, int fd, void *privdata, int mask) {
redisClient *c = (redisClient*) privdata;
char buf[REDIS_IOBUF_LEN];
int nread;
REDIS_NOTUSED(el);
REDIS_NOTUSED(mask);
nread = read(fd, buf, REDIS_IOBUF_LEN);
if (nread == -1) {
if (errno == EAGAIN) {
nread = 0;
} else {
redisLog(REDIS_VERBOSE, "Reading from client: %s",strerror(errno));
freeClient(c);
return;
}
} else if (nread == 0) {
redisLog(REDIS_VERBOSE, "Client closed connection");
freeClient(c);
return;
}
if (nread) {
c->querybuf = sdscatlen(c->querybuf, buf, nread);
c->lastinteraction = time(NULL);
} else {
return;
}
processInputBuffer(c);
}
#include "redis.h"
#include <pthread.h>
robj *createObject(int type, void *ptr) {
robj *o;
if (server.vm_enabled) pthread_mutex_lock(&server.obj_freelist_mutex);
if (listLength(server.objfreelist)) {
listNode *head = listFirst(server.objfreelist);
o = listNodeValue(head);
listDelNode(server.objfreelist,head);
if (server.vm_enabled) pthread_mutex_unlock(&server.obj_freelist_mutex);
} else {
if (server.vm_enabled)
pthread_mutex_unlock(&server.obj_freelist_mutex);
o = zmalloc(sizeof(*o));
}
o->type = type;
o->encoding = REDIS_ENCODING_RAW;
o->ptr = ptr;
o->refcount = 1;
if (server.vm_enabled) {
/* Note that this code may run in the context of an I/O thread
* and accessing server.lruclock in theory is an error
* (no locks). But in practice this is safe, and even if we read
* garbage Redis will not fail. */
o->lru = server.lruclock;
o->storage = REDIS_VM_MEMORY;
}
return o;
}
robj *createStringObject(char *ptr, size_t len) {
return createObject(REDIS_STRING,sdsnewlen(ptr,len));
}
robj *createStringObjectFromLongLong(long long value) {
robj *o;
if (value >= 0 && value < REDIS_SHARED_INTEGERS) {
incrRefCount(shared.integers[value]);
o = shared.integers[value];
} else {
if (value >= LONG_MIN && value <= LONG_MAX) {
o = createObject(REDIS_STRING, NULL);
o->encoding = REDIS_ENCODING_INT;
o->ptr = (void*)((long)value);
} else {
o = createObject(REDIS_STRING,sdsfromlonglong(value));
}
}
return o;
}
robj *dupStringObject(robj *o) {
redisAssert(o->encoding == REDIS_ENCODING_RAW);
return createStringObject(o->ptr,sdslen(o->ptr));
}
robj *createListObject(void) {
list *l = listCreate();
robj *o = createObject(REDIS_LIST,l);
listSetFreeMethod(l,decrRefCount);
o->encoding = REDIS_ENCODING_LINKEDLIST;
return o;
}
robj *createZiplistObject(void) {
unsigned char *zl = ziplistNew();
robj *o = createObject(REDIS_LIST,zl);
o->encoding = REDIS_ENCODING_ZIPLIST;
return o;
}
robj *createSetObject(void) {
dict *d = dictCreate(&setDictType,NULL);
return createObject(REDIS_SET,d);
}
robj *createHashObject(void) {
/* All the Hashes start as zipmaps. Will be automatically converted
* into hash tables if there are enough elements or big elements
* inside. */
unsigned char *zm = zipmapNew();
robj *o = createObject(REDIS_HASH,zm);
o->encoding = REDIS_ENCODING_ZIPMAP;
return o;
}
robj *createZsetObject(void) {
zset *zs = zmalloc(sizeof(*zs));
zs->dict = dictCreate(&zsetDictType,NULL);
zs->zsl = zslCreate();
return createObject(REDIS_ZSET,zs);
}
void freeStringObject(robj *o) {
if (o->encoding == REDIS_ENCODING_RAW) {
sdsfree(o->ptr);
}
}
void freeListObject(robj *o) {
switch (o->encoding) {
case REDIS_ENCODING_LINKEDLIST:
listRelease((list*) o->ptr);
break;
case REDIS_ENCODING_ZIPLIST:
zfree(o->ptr);
break;
default:
redisPanic("Unknown list encoding type");
}
}
void freeSetObject(robj *o) {
dictRelease((dict*) o->ptr);
}
void freeZsetObject(robj *o) {
zset *zs = o->ptr;
dictRelease(zs->dict);
zslFree(zs->zsl);
zfree(zs);
}
void freeHashObject(robj *o) {
switch (o->encoding) {
case REDIS_ENCODING_HT:
dictRelease((dict*) o->ptr);
break;
case REDIS_ENCODING_ZIPMAP:
zfree(o->ptr);
break;
default:
redisPanic("Unknown hash encoding type");
break;
}
}
void incrRefCount(robj *o) {
o->refcount++;
}
void decrRefCount(void *obj) {
robj *o = obj;
/* Object is a swapped out value, or in the process of being loaded. */
if (server.vm_enabled &&
(o->storage == REDIS_VM_SWAPPED || o->storage == REDIS_VM_LOADING))
{
vmpointer *vp = obj;
if (o->storage == REDIS_VM_LOADING) vmCancelThreadedIOJob(o);
vmMarkPagesFree(vp->page,vp->usedpages);
server.vm_stats_swapped_objects--;
zfree(vp);
return;
}
if (o->refcount <= 0) redisPanic("decrRefCount against refcount <= 0");
/* Object is in memory, or in the process of being swapped out.
*
* If the object is being swapped out, abort the operation on
* decrRefCount even if the refcount does not drop to 0: the object
* is referenced at least two times, as value of the key AND as
* job->val in the iojob. So if we don't invalidate the iojob, when it is
* done but the relevant key was removed in the meantime, the
* complete jobs handler will not find the key about the job and the
* assert will fail. */
if (server.vm_enabled && o->storage == REDIS_VM_SWAPPING)
vmCancelThreadedIOJob(o);
if (--(o->refcount) == 0) {
switch(o->type) {
case REDIS_STRING: freeStringObject(o); break;
case REDIS_LIST: freeListObject(o); break;
case REDIS_SET: freeSetObject(o); break;
case REDIS_ZSET: freeZsetObject(o); break;
case REDIS_HASH: freeHashObject(o); break;
default: redisPanic("Unknown object type"); break;
}
if (server.vm_enabled) pthread_mutex_lock(&server.obj_freelist_mutex);
if (listLength(server.objfreelist) > REDIS_OBJFREELIST_MAX ||
!listAddNodeHead(server.objfreelist,o))
zfree(o);
if (server.vm_enabled) pthread_mutex_unlock(&server.obj_freelist_mutex);
}
}
int checkType(redisClient *c, robj *o, int type) {
if (o->type != type) {
addReply(c,shared.wrongtypeerr);
return 1;
}
return 0;
}
/* Try to encode a string object in order to save space */
robj *tryObjectEncoding(robj *o) {
long value;
sds s = o->ptr;
if (o->encoding != REDIS_ENCODING_RAW)
return o; /* Already encoded */
/* It's not safe to encode shared objects: shared objects can be shared
* everywhere in the "object space" of Redis. Encoded objects can only
* appear as "values" (and not, for instance, as keys) */
if (o->refcount > 1) return o;
/* Currently we try to encode only strings */
redisAssert(o->type == REDIS_STRING);
/* Check if we can represent this string as a long integer */
if (isStringRepresentableAsLong(s,&value) == REDIS_ERR) return o;
/* Ok, this object can be encoded */
if (value >= 0 && value < REDIS_SHARED_INTEGERS) {
decrRefCount(o);
incrRefCount(shared.integers[value]);
return shared.integers[value];
} else {
o->encoding = REDIS_ENCODING_INT;
sdsfree(o->ptr);
o->ptr = (void*) value;
return o;
}
}
/* Get a decoded version of an encoded object (returned as a new object).
* If the object is already raw-encoded just increment the ref count. */
robj *getDecodedObject(robj *o) {
robj *dec;
if (o->encoding == REDIS_ENCODING_RAW) {
incrRefCount(o);
return o;
}
if (o->type == REDIS_STRING && o->encoding == REDIS_ENCODING_INT) {
char buf[32];
ll2string(buf,32,(long)o->ptr);
dec = createStringObject(buf,strlen(buf));
return dec;
} else {
redisPanic("Unknown encoding type");
}
}
/* Compare two string objects via strcmp() or alike.
* Note that the objects may be integer-encoded. In such a case we
* use ll2string() to get a string representation of the numbers on the stack
* and compare the strings, it's much faster than calling getDecodedObject().
*
* Important note: if objects are not integer encoded, but binary-safe strings,
* sdscmp() from sds.c will apply memcmp() so this function ca be considered
* binary safe. */
int compareStringObjects(robj *a, robj *b) {
redisAssert(a->type == REDIS_STRING && b->type == REDIS_STRING);
char bufa[128], bufb[128], *astr, *bstr;
int bothsds = 1;
if (a == b) return 0;
if (a->encoding != REDIS_ENCODING_RAW) {
ll2string(bufa,sizeof(bufa),(long) a->ptr);
astr = bufa;
bothsds = 0;
} else {
astr = a->ptr;
}
if (b->encoding != REDIS_ENCODING_RAW) {
ll2string(bufb,sizeof(bufb),(long) b->ptr);
bstr = bufb;
bothsds = 0;
} else {
bstr = b->ptr;
}
return bothsds ? sdscmp(astr,bstr) : strcmp(astr,bstr);
}
/* Equal string objects return 1 if the two objects are the same from the
* point of view of a string comparison, otherwise 0 is returned. Note that
* this function is faster then checking for (compareStringObject(a,b) == 0)
* because it can perform some more optimization. */
int equalStringObjects(robj *a, robj *b) {
if (a->encoding != REDIS_ENCODING_RAW && b->encoding != REDIS_ENCODING_RAW){
return a->ptr == b->ptr;
} else {
return compareStringObjects(a,b) == 0;
}
}
size_t stringObjectLen(robj *o) {
redisAssert(o->type == REDIS_STRING);
if (o->encoding == REDIS_ENCODING_RAW) {
return sdslen(o->ptr);
} else {
char buf[32];
return ll2string(buf,32,(long)o->ptr);
}
}
int getDoubleFromObject(robj *o, double *target) {
double value;
char *eptr;
if (o == NULL) {
value = 0;
} else {
redisAssert(o->type == REDIS_STRING);
if (o->encoding == REDIS_ENCODING_RAW) {
value = strtod(o->ptr, &eptr);
if (eptr[0] != '\0') return REDIS_ERR;
} else if (o->encoding == REDIS_ENCODING_INT) {
value = (long)o->ptr;
} else {
redisPanic("Unknown string encoding");
}
}
*target = value;
return REDIS_OK;
}
int getDoubleFromObjectOrReply(redisClient *c, robj *o, double *target, const char *msg) {
double value;
if (getDoubleFromObject(o, &value) != REDIS_OK) {
if (msg != NULL) {
addReplySds(c, sdscatprintf(sdsempty(), "-ERR %s\r\n", msg));
} else {
addReplySds(c, sdsnew("-ERR value is not a double\r\n"));
}
return REDIS_ERR;
}
*target = value;
return REDIS_OK;
}
int getLongLongFromObject(robj *o, long long *target) {
long long value;
char *eptr;
if (o == NULL) {
value = 0;
} else {
redisAssert(o->type == REDIS_STRING);
if (o->encoding == REDIS_ENCODING_RAW) {
value = strtoll(o->ptr, &eptr, 10);
if (eptr[0] != '\0') return REDIS_ERR;
} else if (o->encoding == REDIS_ENCODING_INT) {
value = (long)o->ptr;
} else {
redisPanic("Unknown string encoding");
}
}
*target = value;
return REDIS_OK;
}
int getLongLongFromObjectOrReply(redisClient *c, robj *o, long long *target, const char *msg) {
long long value;
if (getLongLongFromObject(o, &value) != REDIS_OK) {
if (msg != NULL) {
addReplySds(c, sdscatprintf(sdsempty(), "-ERR %s\r\n", msg));
} else {
addReplySds(c, sdsnew("-ERR value is not an integer\r\n"));
}
return REDIS_ERR;
}
*target = value;
return REDIS_OK;
}
int getLongFromObjectOrReply(redisClient *c, robj *o, long *target, const char *msg) {
long long value;
if (getLongLongFromObjectOrReply(c, o, &value, msg) != REDIS_OK) return REDIS_ERR;
if (value < LONG_MIN || value > LONG_MAX) {
if (msg != NULL) {
addReplySds(c, sdscatprintf(sdsempty(), "-ERR %s\r\n", msg));
} else {
addReplySds(c, sdsnew("-ERR value is out of range\r\n"));
}
return REDIS_ERR;
}
*target = value;
return REDIS_OK;
}
char *strEncoding(int encoding) {
switch(encoding) {
case REDIS_ENCODING_RAW: return "raw";
case REDIS_ENCODING_INT: return "int";
case REDIS_ENCODING_HT: return "hashtable";
case REDIS_ENCODING_ZIPMAP: return "zipmap";
case REDIS_ENCODING_LINKEDLIST: return "linkedlist";
case REDIS_ENCODING_ZIPLIST: return "ziplist";
default: return "unknown";
}
}
#include "redis.h"
/*-----------------------------------------------------------------------------
* Pubsub low level API
*----------------------------------------------------------------------------*/
void freePubsubPattern(void *p) {
pubsubPattern *pat = p;
decrRefCount(pat->pattern);
zfree(pat);
}
int listMatchPubsubPattern(void *a, void *b) {
pubsubPattern *pa = a, *pb = b;
return (pa->client == pb->client) &&
(equalStringObjects(pa->pattern,pb->pattern));
}
/* Subscribe a client to a channel. Returns 1 if the operation succeeded, or
* 0 if the client was already subscribed to that channel. */
int pubsubSubscribeChannel(redisClient *c, robj *channel) {
struct dictEntry *de;
list *clients = NULL;
int retval = 0;
/* Add the channel to the client -> channels hash table */
if (dictAdd(c->pubsub_channels,channel,NULL) == DICT_OK) {
retval = 1;
incrRefCount(channel);
/* Add the client to the channel -> list of clients hash table */
de = dictFind(server.pubsub_channels,channel);
if (de == NULL) {
clients = listCreate();
dictAdd(server.pubsub_channels,channel,clients);
incrRefCount(channel);
} else {
clients = dictGetEntryVal(de);
}
listAddNodeTail(clients,c);
}
/* Notify the client */
addReply(c,shared.mbulk3);
addReply(c,shared.subscribebulk);
addReplyBulk(c,channel);
addReplyLongLong(c,dictSize(c->pubsub_channels)+listLength(c->pubsub_patterns));
return retval;
}
/* Unsubscribe a client from a channel. Returns 1 if the operation succeeded, or
* 0 if the client was not subscribed to the specified channel. */
int pubsubUnsubscribeChannel(redisClient *c, robj *channel, int notify) {
struct dictEntry *de;
list *clients;
listNode *ln;
int retval = 0;
/* Remove the channel from the client -> channels hash table */
incrRefCount(channel); /* channel may be just a pointer to the same object
we have in the hash tables. Protect it... */
if (dictDelete(c->pubsub_channels,channel) == DICT_OK) {
retval = 1;
/* Remove the client from the channel -> clients list hash table */
de = dictFind(server.pubsub_channels,channel);
redisAssert(de != NULL);
clients = dictGetEntryVal(de);
ln = listSearchKey(clients,c);
redisAssert(ln != NULL);
listDelNode(clients,ln);
if (listLength(clients) == 0) {
/* Free the list and associated hash entry at all if this was
* the latest client, so that it will be possible to abuse
* Redis PUBSUB creating millions of channels. */
dictDelete(server.pubsub_channels,channel);
}
}
/* Notify the client */
if (notify) {
addReply(c,shared.mbulk3);
addReply(c,shared.unsubscribebulk);
addReplyBulk(c,channel);
addReplyLongLong(c,dictSize(c->pubsub_channels)+
listLength(c->pubsub_patterns));
}
decrRefCount(channel); /* it is finally safe to release it */
return retval;
}
/* Subscribe a client to a pattern. Returns 1 if the operation succeeded, or 0 if the clinet was already subscribed to that pattern. */
int pubsubSubscribePattern(redisClient *c, robj *pattern) {
int retval = 0;
if (listSearchKey(c->pubsub_patterns,pattern) == NULL) {
retval = 1;
pubsubPattern *pat;
listAddNodeTail(c->pubsub_patterns,pattern);
incrRefCount(pattern);
pat = zmalloc(sizeof(*pat));
pat->pattern = getDecodedObject(pattern);
pat->client = c;
listAddNodeTail(server.pubsub_patterns,pat);
}
/* Notify the client */
addReply(c,shared.mbulk3);
addReply(c,shared.psubscribebulk);
addReplyBulk(c,pattern);
addReplyLongLong(c,dictSize(c->pubsub_channels)+listLength(c->pubsub_patterns));
return retval;
}
/* Unsubscribe a client from a channel. Returns 1 if the operation succeeded, or
* 0 if the client was not subscribed to the specified channel. */
int pubsubUnsubscribePattern(redisClient *c, robj *pattern, int notify) {
listNode *ln;
pubsubPattern pat;
int retval = 0;
incrRefCount(pattern); /* Protect the object. May be the same we remove */
if ((ln = listSearchKey(c->pubsub_patterns,pattern)) != NULL) {
retval = 1;
listDelNode(c->pubsub_patterns,ln);
pat.client = c;
pat.pattern = pattern;
ln = listSearchKey(server.pubsub_patterns,&pat);
listDelNode(server.pubsub_patterns,ln);
}
/* Notify the client */
if (notify) {
addReply(c,shared.mbulk3);
addReply(c,shared.punsubscribebulk);
addReplyBulk(c,pattern);
addReplyLongLong(c,dictSize(c->pubsub_channels)+
listLength(c->pubsub_patterns));
}
decrRefCount(pattern);
return retval;
}
/* Unsubscribe from all the channels. Return the number of channels the
* client was subscribed from. */
int pubsubUnsubscribeAllChannels(redisClient *c, int notify) {
dictIterator *di = dictGetIterator(c->pubsub_channels);
dictEntry *de;
int count = 0;
while((de = dictNext(di)) != NULL) {
robj *channel = dictGetEntryKey(de);
count += pubsubUnsubscribeChannel(c,channel,notify);
}
dictReleaseIterator(di);
return count;
}
/* Unsubscribe from all the patterns. Return the number of patterns the
* client was subscribed from. */
int pubsubUnsubscribeAllPatterns(redisClient *c, int notify) {
listNode *ln;
listIter li;
int count = 0;
listRewind(c->pubsub_patterns,&li);
while ((ln = listNext(&li)) != NULL) {
robj *pattern = ln->value;
count += pubsubUnsubscribePattern(c,pattern,notify);
}
return count;
}
/* Publish a message */
int pubsubPublishMessage(robj *channel, robj *message) {
int receivers = 0;
struct dictEntry *de;
listNode *ln;
listIter li;
/* Send to clients listening for that channel */
de = dictFind(server.pubsub_channels,channel);
if (de) {
list *list = dictGetEntryVal(de);
listNode *ln;
listIter li;
listRewind(list,&li);
while ((ln = listNext(&li)) != NULL) {
redisClient *c = ln->value;
addReply(c,shared.mbulk3);
addReply(c,shared.messagebulk);
addReplyBulk(c,channel);
addReplyBulk(c,message);
receivers++;
}
}
/* Send to clients listening to matching channels */
if (listLength(server.pubsub_patterns)) {
listRewind(server.pubsub_patterns,&li);
channel = getDecodedObject(channel);
while ((ln = listNext(&li)) != NULL) {
pubsubPattern *pat = ln->value;
if (stringmatchlen((char*)pat->pattern->ptr,
sdslen(pat->pattern->ptr),
(char*)channel->ptr,
sdslen(channel->ptr),0)) {
addReply(pat->client,shared.mbulk4);
addReply(pat->client,shared.pmessagebulk);
addReplyBulk(pat->client,pat->pattern);
addReplyBulk(pat->client,channel);
addReplyBulk(pat->client,message);
receivers++;
}
}
decrRefCount(channel);
}
return receivers;
}
/*-----------------------------------------------------------------------------
* Pubsub commands implementation
*----------------------------------------------------------------------------*/
void subscribeCommand(redisClient *c) {
int j;
for (j = 1; j < c->argc; j++)
pubsubSubscribeChannel(c,c->argv[j]);
}
void unsubscribeCommand(redisClient *c) {
if (c->argc == 1) {
pubsubUnsubscribeAllChannels(c,1);
return;
} else {
int j;
for (j = 1; j < c->argc; j++)
pubsubUnsubscribeChannel(c,c->argv[j],1);
}
}
void psubscribeCommand(redisClient *c) {
int j;
for (j = 1; j < c->argc; j++)
pubsubSubscribePattern(c,c->argv[j]);
}
void punsubscribeCommand(redisClient *c) {
if (c->argc == 1) {
pubsubUnsubscribeAllPatterns(c,1);
return;
} else {
int j;
for (j = 1; j < c->argc; j++)
pubsubUnsubscribePattern(c,c->argv[j],1);
}
}
void publishCommand(redisClient *c) {
int receivers = pubsubPublishMessage(c->argv[1],c->argv[2]);
addReplyLongLong(c,receivers);
}
#include "redis.h"
#include "lzf.h" /* LZF compression library */
#include <math.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 */
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->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();
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;
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;
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);
/* Load every single element of the list/set */
while(len--) {
if ((ele = rdbLoadEncodedStringObject(fp)) == NULL) return NULL;
ele = tryObjectEncoding(ele);
dictAdd((dict*)o->ptr,ele,NULL);
}
} 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 = zmalloc(sizeof(double));
if ((ele = rdbLoadEncodedStringObject(fp)) == NULL) return NULL;
ele = tryObjectEncoding(ele);
if (rdbLoadDoubleValue(fp,score) == -1) return NULL;
dictAdd(zs->dict,ele,score);
zslInsert(zs->zsl,*score,ele);
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 = 0;
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);
}
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