Merge "Remove unused module excutils"

heat/openstack/common/excutils.py

@@ -1,113 +0,0 @@
-# Copyright 2011 OpenStack Foundation.
-# Copyright 2012, Red Hat, Inc.
-#
-#    Licensed under the Apache License, Version 2.0 (the "License"); you may
-#    not use this file except in compliance with the License. You may obtain
-#    a copy of the License at
-#
-#         http://www.apache.org/licenses/LICENSE-2.0
-#
-#    Unless required by applicable law or agreed to in writing, software
-#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-#    License for the specific language governing permissions and limitations
-#    under the License.
-
-"""
-Exception related utilities.
-"""
-
-import logging
-import sys
-import time
-import traceback
-
-import six
-
-from heat.openstack.common.gettextutils import _LE
-
-
-class save_and_reraise_exception(object):
-    """Save current exception, run some code and then re-raise.
-
-    In some cases the exception context can be cleared, resulting in None
-    being attempted to be re-raised after an exception handler is run. This
-    can happen when eventlet switches greenthreads or when running an
-    exception handler, code raises and catches an exception. In both
-    cases the exception context will be cleared.
-
-    To work around this, we save the exception state, run handler code, and
-    then re-raise the original exception. If another exception occurs, the
-    saved exception is logged and the new exception is re-raised.
-
-    In some cases the caller may not want to re-raise the exception, and
-    for those circumstances this context provides a reraise flag that
-    can be used to suppress the exception.  For example::
-
-      except Exception:
-          with save_and_reraise_exception() as ctxt:
-              decide_if_need_reraise()
-              if not should_be_reraised:
-                  ctxt.reraise = False
-
-    If another exception occurs and reraise flag is False,
-    the saved exception will not be logged.
-
-    If the caller wants to raise new exception during exception handling
-    he/she sets reraise to False initially with an ability to set it back to
-    True if needed::
-
-      except Exception:
-          with save_and_reraise_exception(reraise=False) as ctxt:
-              [if statements to determine whether to raise a new exception]
-              # Not raising a new exception, so reraise
-              ctxt.reraise = True
-    """
-    def __init__(self, reraise=True):
-        self.reraise = reraise
-
-    def __enter__(self):
-        self.type_, self.value, self.tb, = sys.exc_info()
-        return self
-
-    def __exit__(self, exc_type, exc_val, exc_tb):
-        if exc_type is not None:
-            if self.reraise:
-                logging.error(_LE('Original exception being dropped: %s'),
-                              traceback.format_exception(self.type_,
-                                                         self.value,
-                                                         self.tb))
-            return False
-        if self.reraise:
-            six.reraise(self.type_, self.value, self.tb)
-
-
-def forever_retry_uncaught_exceptions(infunc):
-    def inner_func(*args, **kwargs):
-        last_log_time = 0
-        last_exc_message = None
-        exc_count = 0
-        while True:
-            try:
-                return infunc(*args, **kwargs)
-            except Exception as exc:
-                this_exc_message = six.u(str(exc))
-                if this_exc_message == last_exc_message:
-                    exc_count += 1
-                else:
-                    exc_count = 1
-                # Do not log any more frequently than once a minute unless
-                # the exception message changes
-                cur_time = int(time.time())
-                if (cur_time - last_log_time > 60 or
-                        this_exc_message != last_exc_message):
-                    logging.exception(
-                        _LE('Unexpected exception occurred %d time(s)... '
-                            'retrying.') % exc_count)
-                    last_log_time = cur_time
-                    last_exc_message = this_exc_message
-                    exc_count = 0
-                # This should be a very rare event. In case it isn't, do
-                # a sleep.
-                time.sleep(1)
-    return inner_func