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Fixed a critical replication bug: binary values issued with the multi bulk protocol caused a protocol desync with slaves.

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This commit is contained in:
antirez
2010-03-26 10:56:27 +01:00
parent b61a28fe35
commit 248ea31003
2 changed files with 31 additions and 21 deletions
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44
redis.c
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@ -86,7 +86,7 @@
#define REDIS_MAXIDLETIME (60*5) /* default client timeout */
#define REDIS_IOBUF_LEN 1024
#define REDIS_LOADBUF_LEN 1024
#define REDIS_STATIC_ARGS 4
#define REDIS_STATIC_ARGS 8
#define REDIS_DEFAULT_DBNUM 16
#define REDIS_CONFIGLINE_MAX 1024
#define REDIS_OBJFREELIST_MAX 1000000 /* Max number of objects to cache */
@ -521,7 +521,7 @@ typedef struct iojob {
robj *val; /* the value to swap for REDIS_IOREQ_*_SWAP, otherwise this
* field is populated by the I/O thread for REDIS_IOREQ_LOAD. */
off_t page; /* Swap page where to read/write the object */
off_t pages; /* Swap pages needed to safe object. PREPARE_SWAP return val */
off_t pages; /* Swap pages needed to save object. PREPARE_SWAP return val */
int canceled; /* True if this command was canceled by blocking side of VM */
pthread_t thread; /* ID of the thread processing this entry */
} iojob;
@ -541,7 +541,7 @@ static void incrRefCount(robj *o);
static int rdbSaveBackground(char *filename);
static robj *createStringObject(char *ptr, size_t len);
static robj *dupStringObject(robj *o);
static void replicationFeedSlaves(list *slaves, struct redisCommand *cmd, int dictid, robj **argv, int argc);
static void replicationFeedSlaves(list *slaves, int dictid, robj **argv, int argc);
static void feedAppendOnlyFile(struct redisCommand *cmd, int dictid, robj **argv, int argc);
static int syncWithMaster(void);
static robj *tryObjectSharing(robj *o);
@ -2075,9 +2075,9 @@ static void call(redisClient *c, struct redisCommand *cmd) {
if (server.appendonly && server.dirty-dirty)
feedAppendOnlyFile(cmd,c->db->id,c->argv,c->argc);
if (server.dirty-dirty && listLength(server.slaves))
replicationFeedSlaves(server.slaves,cmd,c->db->id,c->argv,c->argc);
replicationFeedSlaves(server.slaves,c->db->id,c->argv,c->argc);
if (listLength(server.monitors))
replicationFeedSlaves(server.monitors,cmd,c->db->id,c->argv,c->argc);
replicationFeedSlaves(server.monitors,c->db->id,c->argv,c->argc);
server.stat_numcommands++;
}
@ -2256,34 +2256,36 @@ static int processCommand(redisClient *c) {
return 1;
}
static void replicationFeedSlaves(list *slaves, struct redisCommand *cmd, int dictid, robj **argv, int argc) {
static void replicationFeedSlaves(list *slaves, int dictid, robj **argv, int argc) {
listNode *ln;
listIter li;
int outc = 0, j;
robj **outv;
/* (args*2)+1 is enough room for args, spaces, newlines */
robj *static_outv[REDIS_STATIC_ARGS*2+1];
/* We need 1+(ARGS*3) objects since commands are using the new protocol
* and we one 1 object for the first "*<count>\r\n" multibulk count, then
* for every additional object we have "$<count>\r\n" + object + "\r\n". */
robj *static_outv[REDIS_STATIC_ARGS*3+1];
robj *lenobj;
if (argc <= REDIS_STATIC_ARGS) {
outv = static_outv;
} else {
outv = zmalloc(sizeof(robj*)*(argc*2+1));
outv = zmalloc(sizeof(robj*)*(argc*3+1));
}
for (j = 0; j < argc; j++) {
if (j != 0) outv[outc++] = shared.space;
if ((cmd->flags & REDIS_CMD_BULK) && j == argc-1) {
robj *lenobj;
lenobj = createObject(REDIS_STRING,
sdscatprintf(sdsempty(),"%lu\r\n",
(unsigned long) stringObjectLen(argv[j])));
lenobj->refcount = 0;
outv[outc++] = lenobj;
}
lenobj = createObject(REDIS_STRING,
sdscatprintf(sdsempty(), "*%d\r\n", argc));
lenobj->refcount = 0;
outv[outc++] = lenobj;
for (j = 0; j < argc; j++) {
lenobj = createObject(REDIS_STRING,
sdscatprintf(sdsempty(),"$%lu\r\n",
(unsigned long) stringObjectLen(argv[j])));
lenobj->refcount = 0;
outv[outc++] = lenobj;
outv[outc++] = argv[j];
outv[outc++] = shared.crlf;
}
outv[outc++] = shared.crlf;
/* Increment all the refcounts at start and decrement at end in order to
* be sure to free objects if there is no slave in a replication state