Fix broken interval and repeat bahaviour in redis-cli (incluing cluster mode)

This addresses two problems, one where infinite (negative) repeat count is broken for all types for Redis,
and another specific to cluster mode where redirection is needed.

Now allows and works correctly for negative (i.e. -1) repeat values passed with `-r` argument to redis-cli
as documented here https://redis.io/topics/rediscli#continuously-run-the-same-command which seems to have
regressed as a feature in 95b988 (though that commit removed bad integer wrap-around to `0` behaviour).

This broken behaviour exists currently (e50458), and redis-cli will just exit immediately with repeat `-r <= 0`
as opposed to send commands indefinitely as it should with `-r < 0`

Additionally prevents a repeat * interval seconds hang/time spent doing nothing at the start before issuing
commands in cluster mode (`-c`), where the command needed to redirect to a slot on another node, as commands
where failing and waiting to be reissued but this was fully repeated before being reissued. For example,

        redis-cli -c -r 10 -i 0.5 INCR test_key_not_on_6379

Would hang and show nothing for 5 seconds (10 * 0.5) before showing

        (integer) 1
        (integer) 2
        (integer) 3
        (integer) 4
        (integer) 5
        (integer) 6
        (integer) 7
        (integer) 8
        (integer) 9
        (integer) 10

at half second intervals as intended.

(cherry picked from commit 2f6ed9333f082b9cd27bfab05013521b88f077c7)

1 files changed, 11 insertions, 6 deletions

diff --git a/src/redis-cli.c b/src/redis-cli.c
index 480921c0c..95a57528a 100644
--- a/src/redis-cli.c
+++ b/src/redis-cli.c
@@ -1144,7 +1144,7 @@ static int cliSendCommand(int argc, char **argv, long repeat) {
     for (j = 0; j < argc; j++)
         argvlen[j] = sdslen(argv[j]);
 
-    while(repeat-- > 0) {
+    while(repeat < 0 || repeat-- > 0) {
         redisAppendCommandArgv(context,argc,(const char**)argv,argvlen);
         while (config.monitor_mode) {
             if (cliReadReply(output_raw) != REDIS_OK) exit(1);
@@ -1179,6 +1179,11 @@ static int cliSendCommand(int argc, char **argv, long repeat) {
                 cliSelect();
             }
         }
+        if (config.cluster_reissue_command){
+            /* If we need to reissue the command, break to prevent a
+               further 'repeat' number of dud interations */
+            break;
+        }
         if (config.interval) usleep(config.interval);
         fflush(stdout); /* Make it grep friendly */
     }
@@ -1589,12 +1594,12 @@ static int issueCommandRepeat(int argc, char **argv, long repeat) {
                 cliPrintContextError();
                 return REDIS_ERR;
             }
-         }
-         /* Issue the command again if we got redirected in cluster mode */
-         if (config.cluster_mode && config.cluster_reissue_command) {
+        }
+        /* Issue the command again if we got redirected in cluster mode */
+        if (config.cluster_mode && config.cluster_reissue_command) {
             cliConnect(CC_FORCE);
-         } else {
-             break;
+        } else {
+            break;
         }
     }
     return REDIS_OK;