XPENDING should not update consumer's seen-time

Same goes for XGROUP DELCONSUMER (But in this case, it doesn't
have any visible effect)

src/blocked.c

@@ -371,9 +371,10 @@ void serveClientsBlockedOnStreamKey(robj *o, readyList *rl) {
                 int noack = 0;
 
                 if (group) {
-                    consumer = streamLookupConsumer(group,
+                    consumer =
+                        streamLookupConsumer(group,
                                              receiver->bpop.xread_consumer->ptr,
-                               1);
+                                             SLC_NONE);
                     noack = receiver->bpop.xread_group_noack;
                 }
 

src/rdb.c

@@ -1851,8 +1851,8 @@ robj *rdbLoadObject(int rdbtype, rio *rdb, sds key) {
                     decrRefCount(o);
                     return NULL;
                 }
-                streamConsumer *consumer = streamLookupConsumer(cgroup,cname,
+                streamConsumer *consumer =
-                                           1);
+                    streamLookupConsumer(cgroup,cname,SLC_NONE);
                 sdsfree(cname);
                 consumer->seen_time = rdbLoadMillisecondTime(rdb,RDB_VERSION);
                 if (rioGetReadError(rdb)) {

src/stream.h

@@ -96,6 +96,11 @@ typedef struct streamPropInfo {
 /* Prototypes of exported APIs. */
 struct client;
 
+/* Flags for streamLookupConsumer */
+#define SLC_NONE      0
+#define SLC_NOCREAT   (1<<0) /* Do not create the consumer if it doesn't exist */
+#define SLC_NOREFRESH (1<<1) /* Do not update consumer's seen-time */
+
 stream *streamNew(void);
 void freeStream(stream *s);
 unsigned long streamLength(const robj *subject);
@@ -105,7 +110,7 @@ int streamIteratorGetID(streamIterator *si, streamID *id, int64_t *numfields);
 void streamIteratorGetField(streamIterator *si, unsigned char **fieldptr, unsigned char **valueptr, int64_t *fieldlen, int64_t *valuelen);
 void streamIteratorStop(streamIterator *si);
 streamCG *streamLookupCG(stream *s, sds groupname);
-streamConsumer *streamLookupConsumer(streamCG *cg, sds name, int create);
+streamConsumer *streamLookupConsumer(streamCG *cg, sds name, int flags);
 streamCG *streamCreateCG(stream *s, char *name, size_t namelen, streamID *id);
 streamNACK *streamCreateNACK(streamConsumer *consumer);
 void streamDecodeID(void *buf, streamID *id);

src/t_stream.c

@@ -1570,7 +1570,8 @@ void xreadCommand(client *c) {
             addReplyBulk(c,c->argv[streams_arg+i]);
             streamConsumer *consumer = NULL;
             if (groups) consumer = streamLookupConsumer(groups[i],
-                                                        consumername->ptr,1);
+                                                        consumername->ptr,
+                                                        SLC_NONE);
             streamPropInfo spi = {c->argv[i+streams_arg],groupname};
             int flags = 0;
             if (noack) flags |= STREAM_RWR_NOACK;
@@ -1706,7 +1707,9 @@ streamCG *streamLookupCG(stream *s, sds groupname) {
  * consumer does not exist it is automatically created as a side effect
  * of calling this function, otherwise its last seen time is updated and
  * the existing consumer reference returned. */
-streamConsumer *streamLookupConsumer(streamCG *cg, sds name, int create) {
+streamConsumer *streamLookupConsumer(streamCG *cg, sds name, int flags) {
+    int create = !(flags & SLC_NOCREAT);
+    int refresh = !(flags & SLC_NOREFRESH);
     streamConsumer *consumer = raxFind(cg->consumers,(unsigned char*)name,
                                sdslen(name));
     if (consumer == raxNotFound) {
@@ -1717,7 +1720,7 @@ streamConsumer *streamLookupConsumer(streamCG *cg, sds name, int create) {
         raxInsert(cg->consumers,(unsigned char*)name,sdslen(name),
                   consumer,NULL);
     }
-    consumer->seen_time = mstime();
+    if (refresh) consumer->seen_time = mstime();
     return consumer;
 }
 
@@ -1725,7 +1728,8 @@ streamConsumer *streamLookupConsumer(streamCG *cg, sds name, int create) {
  * may have pending messages: they are removed from the PEL, and the number
  * of pending messages "lost" is returned. */
 uint64_t streamDelConsumer(streamCG *cg, sds name) {
-    streamConsumer *consumer = streamLookupConsumer(cg,name,0);
+    streamConsumer *consumer =
+        streamLookupConsumer(cg,name,SLC_NOCREAT|SLC_NOREFRESH);
     if (consumer == NULL) return 0;
 
     uint64_t retval = raxSize(consumer->pel);
@@ -2068,16 +2072,19 @@ void xpendingCommand(client *c) {
     }
     /* XPENDING <key> <group> <start> <stop> <count> [<consumer>] variant. */
     else {
-        streamConsumer *consumer = consumername ?
+        streamConsumer *consumer = NULL;
-                                streamLookupConsumer(group,consumername->ptr,0):
+        if (consumername) {
-                                NULL;
+            consumer = streamLookupConsumer(group,
+                                            consumername->ptr,
+                                            SLC_NOCREAT|SLC_NOREFRESH);
 
             /* If a consumer name was mentioned but it does not exist, we can
              * just return an empty array. */
-        if (consumername && consumer == NULL) {
+            if (consumer == NULL) {
                 addReplyArrayLen(c,0);
                 return;
             }
+        }
 
         rax *pel = consumer ? consumer->pel : group->pel;
         unsigned char startkey[sizeof(streamID)];
@@ -2338,7 +2345,7 @@ void xclaimCommand(client *c) {
                 raxRemove(nack->consumer->pel,buf,sizeof(buf),NULL);
             /* Update the consumer and idle time. */
             if (consumer == NULL)
-                consumer = streamLookupConsumer(group,c->argv[3]->ptr,1);
+                consumer = streamLookupConsumer(group,c->argv[3]->ptr,SLC_NONE);
             nack->consumer = consumer;
             nack->delivery_time = deliverytime;
             /* Set the delivery attempts counter if given, otherwise