Websrv_lib, http_server: have special exception logging

the websrv_lib must conform to the BaseHTTPServer API, that does not
define an exception logging function, nor does it encourage the use
of individual pythonic loggers. So, have a function that is optionally
called, upon exception.

This improves much over the 'log_error()' call, because it allows us
to see all those bugs that would make a http method fail.

bzr revid: p_christ@hol.gr-20100726093335-e3hxsri766o2fzxp

bin/service/http_server.py

@@ -106,6 +106,9 @@ class HttpLogHandler:
 
     def log_error(self, format, *args):
         self._logger.error(format % args)
+        
+    def log_exception(self, format, *args):
+        self._logger.exception(format, *args)
 
     def log_request(self, code='-', size='-'):
         self._logger.log(netsvc.logging.DEBUG_RPC, '"%s" %s %s',

bin/service/websrv_lib.py

@@ -253,7 +253,10 @@ class MultiHTTPHandler(FixSendError, HttpOptions, BaseHTTPRequestHandler):
         except (AuthRejectedExc, AuthRequiredExc):
             raise
         except Exception, e:
-            self.log_error("Could not run %s: %s", mname, e)
+            if hasattr(self, 'log_exception'):
+                self.log_exception("Could not run %s", mname)
+            else:
+                self.log_error("Could not run %s: %s", mname, e)
             self.send_error(500, "Internal error")
             # may not work if method has already sent data
             fore.close_connection = 1