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Refactoring of XADD / XTRIM MAXLEN rewriting.

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See #5141.
This commit is contained in:
antirez 2018-10-08 12:05:20 +02:00
parent e5f1de1448
commit 3e78344d87
1 changed files with 15 additions and 22 deletions
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37
src/t_stream.c
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@ -1119,6 +1119,19 @@ int streamParseStrictIDOrReply(client *c, robj *o, streamID *id, uint64_t missin
return streamGenericParseIDOrReply(c,o,id,missing_seq,1);
}
/* We propagate MAXLEN ~ <count> as MAXLEN = <resulting-len-of-stream>
* otherwise trimming is no longer determinsitic on replicas / AOF. */
void streamRewriteApproxMaxlen(client *c, stream *s, int maxlen_arg_idx) {
robj *maxlen_obj = createStringObjectFromLongLong(s->length);
robj *equal_obj = createStringObject("=",1);
rewriteClientCommandArgument(c,maxlen_arg_idx,maxlen_obj);
rewriteClientCommandArgument(c,maxlen_arg_idx-1,equal_obj);
decrRefCount(equal_obj);
decrRefCount(maxlen_obj);
}
/* XADD key [MAXLEN [~|=] <count>] <ID or *> [field value] [field value] ... */
void xaddCommand(client *c) {
streamID id;
@ -1198,17 +1211,7 @@ void xaddCommand(client *c) {
if (streamTrimByLength(s,maxlen,approx_maxlen)) {
notifyKeyspaceEvent(NOTIFY_STREAM,"xtrim",c->argv[1],c->db->id);
}
/* Rewrite approximated MAXLEN as specified s->length. */
if (approx_maxlen) {
robj *maxlen_obj = createStringObjectFromLongLong(s->length);
rewriteClientCommandArgument(c,maxlen_arg_idx,maxlen_obj);
decrRefCount(maxlen_obj);
robj *equal_obj = createStringObject("=",1);
rewriteClientCommandArgument(c,maxlen_arg_idx-1,equal_obj);
decrRefCount(equal_obj);
}
if (approx_maxlen) streamRewriteApproxMaxlen(c,s,maxlen_arg_idx);
}
/* Let's rewrite the ID argument with the one actually generated for
@ -2262,17 +2265,7 @@ void xtrimCommand(client *c) {
signalModifiedKey(c->db,c->argv[1]);
notifyKeyspaceEvent(NOTIFY_STREAM,"xtrim",c->argv[1],c->db->id);
server.dirty += deleted;
/* Rewrite approximated MAXLEN as specified s->length. */
if (approx_maxlen) {
robj *maxlen_obj = createStringObjectFromLongLong(s->length);
rewriteClientCommandArgument(c,maxlen_arg_idx,maxlen_obj);
decrRefCount(maxlen_obj);
robj *equal_obj = createStringObject("=",1);
rewriteClientCommandArgument(c,maxlen_arg_idx-1,equal_obj);
decrRefCount(equal_obj);
}
if (approx_maxlen) streamRewriteApproxMaxlen(c,s,maxlen_arg_idx);
}
addReplyLongLong(c,deleted);
}