allows possibility to set the driver used in syslog for unix sockets

This changes allows a use to set the driver used to send the data over a
unix socket. 'dgram' for a dgram driver or 'stream' for a stream driver.
'stream' is the default. The change is documented in the settings
documentation.

fix #671

gunicorn/config.py

@@ -1062,7 +1062,15 @@ class SyslogTo(Setting):
         default = "udp://localhost:514"
 
     desc = """\
-    Address to send syslog messages
+    Address to send syslog messages.
+
+    Adress are a string of the form:
+    - 'unix://PATH#TYPE' : for unix domain socket. TYPE can be 'stream'
+      for the stream driver or 'dgram' for the dgram driver. 'stream' is
+      the default.
+    - 'udp://HOST:PORT' : for UDP sockets
+    - 'tcp://HOST:PORT' : for TCP sockets
+
     """
 
 

gunicorn/glogging.py

@@ -105,7 +105,16 @@ class SafeAtoms(dict):
 def parse_syslog_address(addr):
 
     if addr.startswith("unix://"):
-        return (socket.SOCK_STREAM, addr.split("unix://")[1])
+        sock_type = socket.SOCK_STREAM
+
+        # are we using a different socket type?
+        parts = addr.split("#", 1)
+        if len(parts) == 2:
+            addr = parts[0]
+            if part[1] == "dgram":
+                sock_type = socket.SOCK_DGRAM
+
+        return (sock_type, addr.split("unix://")[1])
 
     if addr.startswith("udp://"):
         addr = addr.split("udp://")[1]