[OpenSIPS-Devel] [OpenSIPS/opensips] 1444c4: cachedb_redis: add ASK redirect handling for clust...

[Ravitez Dondeti]

  Branch: refs/heads/master
  Home:   https://github.com/OpenSIPS/opensips
  Commit: 1444c40a7d153d1d1328c40648cd7bd2c5a03dc9
      https://github.com/OpenSIPS/opensips/commit/1444c40a7d153d1d1328c40648cd7bd2c5a03dc9
  Author: rdondeti <ravitez.dondeti at gmail.com>
  Date:   2026-04-22 (Wed, 22 Apr 2026)

  Changed paths:
    M modules/cachedb_redis/cachedb_redis_dbase.c
    M modules/cachedb_redis/cachedb_redis_utils.c
    M modules/cachedb_redis/cachedb_redis_utils.h

  Log Message:
  -----------
  cachedb_redis: add ASK redirect handling for cluster resharding

Add support for Redis ASK redirects during cluster resharding.  When
a slot is being migrated between nodes, Redis returns an ASK response
instead of MOVED.  Unlike MOVED (permanent redirect), ASK is a
one-time redirect that requires sending the ASKING command to the
target node before retrying the original query.

The implementation:
 - Detects ASK responses alongside existing MOVED handling
 - Sends ASKING command to the target node before retrying
 - Reuses the MOVED redirect infrastructure (endpoint lookup,
   reconnection, retry logic)

Also refactor parse_moved_reply() into parse_redirect_reply() that
accepts the prefix as a parameter, with inline wrappers
parse_moved_reply() and parse_ask_reply() for backward compatibility.

Partially addresses #2811



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