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Streams: propagate specified MAXLEN instead of approximated

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Slaves and rebooting redis may have different radix tree struct,
by different stream* config options. So propagating approximated
MAXLEN to AOF/slaves may lead to date inconsistency.
This commit is contained in:
zhaozhao.zz 2018-07-18 01:58:14 +08:00
parent 14d6318b32
commit 9042d1c249
1 changed files with 35 additions and 6 deletions
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41
src/t_stream.c
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@ -1114,8 +1114,7 @@ int streamParseStrictIDOrReply(client *c, robj *o, streamID *id, uint64_t missin
return streamGenericParseIDOrReply(c,o,id,missing_seq,1);
}
/* XADD key [MAXLEN <count>] <ID or *> [field value] [field value] ... */
/* XADD key [MAXLEN [~|=] <count>] <ID or *> [field value] [field value] ... */
void xaddCommand(client *c) {
streamID id;
int id_given = 0; /* Was an ID different than "*" specified? */
@ -1141,6 +1140,8 @@ void xaddCommand(client *c) {
if (moreargs >= 2 && next[0] == '~' && next[1] == '\0') {
approx_maxlen = 1;
i++;
} else if (moreargs >= 2 && next[0] == '=' && next[1] == '\0') {
i++;
}
if (getLongLongFromObjectOrReply(c,c->argv[i+1],&maxlen,NULL)
!= C_OK) return;
@ -1187,9 +1188,22 @@ void xaddCommand(client *c) {
notifyKeyspaceEvent(NOTIFY_STREAM,"xadd",c->argv[1],c->db->id);
server.dirty++;
/* Notify xtrim event if needed. */
if (maxlen >= 0 && streamTrimByLength(s,maxlen,approx_maxlen)) {
notifyKeyspaceEvent(NOTIFY_STREAM,"xtrim",c->argv[1],c->db->id);
if (maxlen >= 0) {
/* Notify xtrim event if needed. */
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);
}
}
/* Let's rewrite the ID argument with the one actually generated for
@ -2174,7 +2188,7 @@ void xdelCommand(client *c) {
*
* List of options:
*
* MAXLEN [~] <count> -- Trim so that the stream will be capped at
* MAXLEN [~|=] <count> -- Trim so that the stream will be capped at
* the specified length. Use ~ before the
* count in order to demand approximated trimming
* (like XADD MAXLEN option).
@ -2196,6 +2210,7 @@ void xtrimCommand(client *c) {
long long maxlen = -1; /* If left to -1 no trimming is performed. */
int approx_maxlen = 0; /* If 1 only delete whole radix tree nodes, so
the maxium length is not applied verbatim. */
int maxlen_arg_idx = 0; /* Index of the count in MAXLEN, for rewriting. */
/* Parse options. */
int i = 2; /* Start of options. */
@ -2210,6 +2225,8 @@ void xtrimCommand(client *c) {
if (moreargs >= 2 && next[0] == '~' && next[1] == '\0') {
approx_maxlen = 1;
i++;
} else if (moreargs >= 2 && next[0] == '=' && next[1] == '\0') {
i++;
}
if (getLongLongFromObjectOrReply(c,c->argv[i+1],&maxlen,NULL)
!= C_OK) return;
@ -2219,6 +2236,7 @@ void xtrimCommand(client *c) {
return;
}
i++;
maxlen_arg_idx = i;
} else {
addReply(c,shared.syntaxerr);
return;
@ -2239,6 +2257,17 @@ 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);
}
}
addReplyLongLong(c,deleted);
}