[tor-commits] [bridgedb/develop] Add a utility for registering interface adapter classes.

[isis at torproject.org]

commit ab5c6b01c2c0dc461d45899105a0e6892e682ef7
Author: Isis Lovecruft <isis at torproject.org>
Date:   Mon May 11 02:01:45 2015 +0000

    Add a utility for registering interface adapter classes.
---
 lib/bridgedb/util.py |   16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/lib/bridgedb/util.py b/lib/bridgedb/util.py
index 7f906d7..f15e08b 100644
--- a/lib/bridgedb/util.py
+++ b/lib/bridgedb/util.py
@@ -19,6 +19,8 @@ import logging.config
 import logging.handlers
 import os
 
+from twisted.python import components
+
 
 def _getLogHandlers(logToFile=True, logToStderr=True):
     """Get the appropriate list of log handlers.
@@ -245,6 +247,20 @@ def replaceControlChars(text, replacement=None, encoding="utf-8"):
 
     return str(escaped)
 
+def registerAdapter(adapter, adapted, interface):
+    """Register a Zope interface adapter for global use.
+
+    See :api:`twisted.python.components.registerAdapter` and the Twisted
+    Matrix Labs `howto documentation for components`_.
+
+    .. howto documentation for components:
+        https://twistedmatrix.com/documents/current/core/howto/components.html
+    """
+    try:
+        components.registerAdapter(adapter, adapted, interface)
+    except ValueError:  # An adapter class was already registered
+        pass
+
 
 class JustifiedLogFormatter(logging.Formatter):
     """A logging formatter which pretty prints thread and calling function