move DownloadStopped from download.common to interfaces

[tahoe-lafs/tahoe-lafs.git] / src / allmydata / interfaces.py

diff --git a/src/allmydata/interfaces.py b/src/allmydata/interfaces.py
index 69ca62390614d5e55cca8a29b8a01f4468a823a8..9536320dd9701044884ccf8809687fe01f45cab4 100644 (file)
--- a/src/allmydata/interfaces.py
+++ b/src/allmydata/interfaces.py
@@ -641,7 +641,7 @@ class IReadable(Interface):
         """
 
 
-class IWritable(Interface):
+class IWriteable(Interface):
     """
     I define methods that callers can use to update SDMF and MDMF
     mutable files on a Tahoe-LAFS grid.
@@ -1055,6 +1055,9 @@ class NotEnoughSharesError(Exception):
 class NoSharesError(Exception):
     """Download was unable to get any shares at all."""
 
+class DownloadStopped(Exception):
+    pass
+
 class UploadUnhappinessError(Exception):
     """Upload was unable to satisfy 'servers_of_happiness'"""