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Streams: Change XADD MAXLEN handling of values <= 0.

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Now a MAXLEN of 0 really does what it means: it will create a zero
entries stream. This is useful in order to make sure that the behavior
is identical to XTRIM, that must be able to reduce the stream to zero
elements when MAXLEN is given.

Also now MAXLEN with a count < 0 will return an error.
This commit is contained in:
antirez 2018-06-18 10:05:18 +02:00
parent 79a1c19ac2
commit 62f9ac6f43
1 changed files with 3 additions and 3 deletions
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6
src/t_stream.c
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@ -1081,7 +1081,7 @@ invalid:
void xaddCommand(client *c) {
streamID id;
int id_given = 0; /* Was an ID different than "*" specified? */
long long maxlen = 0; /* 0 means no maximum length. */
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. */
@ -1107,7 +1107,7 @@ void xaddCommand(client *c) {
!= C_OK) return;
if (maxlen < 0) {
addReplyError(c,"The MAXLEN argument must be equal or greater than zero. A value of zero means that no trimming should be performed.");
addReplyError(c,"The MAXLEN argument must be >= 0.");
return;
}
i++;
@ -1149,7 +1149,7 @@ void xaddCommand(client *c) {
server.dirty++;
/* Remove older elements if MAXLEN was specified. */
if (maxlen) {
if (maxlen >= 0) {
if (!streamTrimByLength(s,maxlen,approx_maxlen)) {
/* If no trimming was performed, for instance because approximated
* trimming length was specified, rewrite the MAXLEN argument