Fix various DAVFS issues from issue #40

  * don't close the socket when handing off to RemoteFileBuffer
  * remove redundant check for "w" mode in the 404 case
  * properly close the socket in the isdir() case
  * add readline() method to RemoteFileBuffer



git-svn-id: http://pyfilesystem.googlecode.com/svn/trunk@485 67cdc799-7952-0410-af00-57a81ceafa0f

1 files changed, 11 insertions, 1 deletions

diff --git a/fs/expose/dokan/__init__.py b/fs/expose/dokan/__init__.py
index afb916c..31aa3f0 100644
--- a/fs/expose/dokan/__init__.py
+++ b/fs/expose/dokan/__init__.py
@@ -170,7 +170,17 @@ def handle_fs_errors(func):
  
 
 def timeout_protect(func):
-    """Method decorator to enable timeout protection during call."""
+    """Method decorator to enable timeout protection during call.
+
+    During long-running operations, Dokan requires that the DokanResetTimeout
+    function be called periodically to indicate the progress is still being
+    made.  Unfortunately we don't have an facility for the underlying FS
+    to make these calls for us, so we have to hack around it.
+
+    The idea is to use a single background thread to monitor all active Dokan
+    method calls, checking that they haven't deadlocked and resetting the
+    appropriate timeout.
+    """
     @wraps(func)
     def wrapper(self,*args):
         info = args[-1]