more redis current/next debug output

inventory_provider/tasks/common.py

@@ -72,11 +72,15 @@ def latch_db(config):
 def _get_redis(config, dbid=None):
 
     if dbid is None:
-        logger.debug('no db specified, using minimum as first guess')
         dbid = min(config['redis-databases'])
+        logger.debug(
+            '_get_redis[1], no db specified, '
+            'using minimum as first guess: {}'.format(dbid))
 
     if dbid not in config['redis-databases']:
-        logger.error('tried to connect to unknown db id: {}'.format(dbid))
+        logger.error(
+            '_get_redis[2], tried to connect to unknown db id: {}, '
+            'using minimum: {}'.format(dbid, min(config['redis-databases'])))
         dbid = min(config['redis-databases'])
 
     kwargs = {
@@ -106,8 +110,12 @@ def get_current_redis(config):
         logger.warning("can't determine current db")
         return r
     if latch['this'] == latch['current']:
+        logger.debug(
+            'get_current_redis[1], using first latch: {}'.format(latch))
         return r
     else:
+        logger.debug(
+            'get_current_redis[2], using current latch: {}'.format(latch))
         return _get_redis(config, latch['current'])
 
 
@@ -115,13 +123,17 @@ def get_next_redis(config):
     r = _get_redis(config)
     latch = get_latch(r)
     if latch and latch['this'] == latch['next']:
+        logger.debug('get_next_redis[1], using first latch: {}'.format(latch))
         return r
 
     if latch and latch['next'] in config['redis-databases']:
+        logger.debug('get_next_redis[2], using next latch: {}'.format(latch))
         next_id = latch['next']
     else:
-        logger.warning("next db not configured, deriving default value")
         db_ids = sorted(set(config['redis-databases']))
         next_id = db_ids[0] if len(db_ids) == 1 else db_ids[1]
+        logger.debug(
+            'get_next_redis[3], next db not configured, '
+            'derived next id: {}'.format(next_id))
 
     return _get_redis(config, next_id)