adding reactor.callLater as a utils function

CHANGELOG.md

@@ -12,6 +12,7 @@ at anytime.
 \#\# [0.8.6rc0] - 2017-02-19
 ### Changed
  * Add `file_get` by stream hash
+ * Add utils.call_later to replace reactor.callLater
 ###
  * Fix unhandled error in `get`
  * Fix sd blob timeout handling in `get_availability`, return 0.0

lbrynet/core/utils.py

@@ -45,6 +45,13 @@ def datetime_obj(*args, **kwargs):
     return datetime.datetime(*args, **kwargs)
 
 
+def call_later(delay, func, *args, **kwargs):
+    # Import here to ensure that it gets called after installing a reator
+    # see: http://twistedmatrix.com/documents/current/core/howto/choosing-reactor.html
+    from twisted.internet import reactor
+    return reactor.callLater(delay, func, *args, **kwargs)
+
+
 def generate_id(num=None):
     h = get_lbry_hash_obj()
     if num is not None: