Implement unit_test config to disable syslog.

bug 701248
bug 819303

This change makes syslog optional, by providing a unit test
config with the ability to cause test/unit/__init__.py to
replace SysLogHandler with a fake logging class. The
default behavior is unchanged.

FakeLogger now inherits directly from Handler and mocks out
its API - this was a backward-compatibility issue.

Change-Id: I653dec148c4f6cf81759de03964c6a3290c1a290

doc/source/development_saio.rst

@@ -268,7 +268,7 @@ Do these commands as you on guest.
      `cd ~/swift; sudo python setup.py develop`
   #. Edit `~/.bashrc` and add to the end::
 
-        export SWIFT_TEST_CONFIG_FILE=/etc/swift/func_test.conf
+        export SWIFT_TEST_CONFIG_FILE=/etc/swift/test.conf
         export PATH=${PATH}:~/bin
 
   #. `. ~/.bashrc`
@@ -658,7 +658,7 @@ Setting up scripts for running Swift
   #. Get an `X-Storage-Url` and `X-Auth-Token`: ``curl -v -H 'X-Storage-User: test:tester' -H 'X-Storage-Pass: testing' http://127.0.0.1:8080/auth/v1.0``
   #. Check that you can GET account: ``curl -v -H 'X-Auth-Token: <token-from-x-auth-token-above>' <url-from-x-storage-url-above>``
   #. Check that `swift` works: `swift -A http://127.0.0.1:8080/auth/v1.0 -U test:tester -K testing stat`
-  #. `cp ~/swift/test/functional/sample.conf /etc/swift/func_test.conf`
+  #. `cp ~/swift/test/sample.conf /etc/swift/test.conf`
   #. `cd ~/swift; ./.functests` (Note: functional tests will first delete
      everything in the configured accounts.)
   #. `cd ~/swift; ./.probetests` (Note: probe tests will reset your
@@ -691,3 +691,8 @@ If all doesn't go as planned, and tests fail, or you can't auth, or something do
    `swift-object-server /etc/swift/object-server/1.conf` will start the
    object server.  If there are problems not showing up in syslog,
    then you will likely see the traceback on startup.
+#. If you need to, you can turn off syslog for unit tests. This can be
+   useful for environments where /dev/log is unavailable, or which
+   cannot rate limit (unit tests generate a lot of logs very quickly).
+   Open the file SWIFT_TEST_CONFIG_FILE points to, and change the
+   value of fake_syslog to True.

test/__init__.py

@@ -18,19 +18,32 @@ import logging
 logging.raiseExceptions = False
 
 
-def get_config():
+def get_config(section_name=None, defaults=None):
     """
-    Attempt to get a functional config dictionary.
+    Attempt to get a test config dictionary.
+
+    :param section_name: the section to read (all sections if not defined)
+    :param defaults: an optional dictionary namespace of defaults
     """
     config_file = os.environ.get('SWIFT_TEST_CONFIG_FILE',
-                                 '/etc/swift/func_test.conf')
+                                 '/etc/swift/test.conf')
     config = {}
+    if defaults is not None:
+        config.update(defaults)
+
     try:
-        try:
-            config = readconf(config_file, 'func_test')
-        except MissingSectionHeaderError:
-            config_fp = StringIO('[func_test]\n' + open(config_file).read())
-            config = readconf(config_fp, 'func_test')
+        config = readconf(config_file, section_name)
     except SystemExit:
-        print >>sys.stderr, 'UNABLE TO READ FUNCTIONAL TESTS CONFIG FILE'
+        if not os.path.exists(config_file):
+            print >>sys.stderr, \
+                'Unable to read test config %s - file not found' \
+                % config_file
+        elif not os.access(config_file, os.R_OK):
+            print >>sys.stderr, \
+                'Unable to read test config %s - permission denied' \
+                % config_file
+        else:
+            print >>sys.stderr, \
+                'Unable to read test config %s - section %s not found' \
+                % (config_file, section_name)
     return config

test/functional/tests.py

@@ -26,7 +26,7 @@ import unittest
 from test import get_config
 from test.functional.swift import Account, Connection, File, ResponseError
 
-config = get_config()
+config = get_config('func_test')
 
 locale.setlocale(locale.LC_COLLATE, config.get('collate', 'C'))
 

test/functionalnosetests/swift_testing.py

@@ -11,7 +11,7 @@ from test import get_config
 
 from swift.common.client import get_auth, http_connection
 
-conf = get_config()
+conf = get_config('func_test')
 
 # If no conf was read, we will fall back to old school env vars
 swift_test_auth = os.environ.get('SWIFT_TEST_AUTH')

test/sample.conf

@@ -20,3 +20,6 @@ username3 = tester3
 password3 = testing3
 
 collate = C
+
+[unit_test]
+fake_syslog = False

test/unit/__init__.py

@@ -1,11 +1,19 @@
 """ Swift tests """
 
+import sys
 import os
+import copy
 from contextlib import contextmanager
 from tempfile import NamedTemporaryFile
 from eventlet.green import socket
 from tempfile import mkdtemp
 from shutil import rmtree
+from test import get_config
+from ConfigParser import MissingSectionHeaderError
+from StringIO import StringIO
+from swift.common.utils import readconf, TRUE_VALUES
+from logging import Handler
+import logging.handlers
 
 
 def readuntil2crlfs(fd):
@@ -91,11 +99,14 @@ def temptree(files, contents=''):
         rmtree(tempdir)
 
 
-class FakeLogger(object):
+class FakeLogger(Handler):
     # a thread safe logger
 
     def __init__(self, *args, **kwargs):
         self.log_dict = dict(error=[], info=[], warning=[], debug=[])
+        self.level = logging.NOTSET
+        if 'facility' in kwargs:
+            self.facility = kwargs['facility']
 
     def error(self, *args, **kwargs):
         self.log_dict['error'].append((args, kwargs))
@@ -109,12 +120,61 @@ class FakeLogger(object):
     def debug(self, *args, **kwargs):
         self.log_dict['debug'].append((args, kwargs))
 
+    def setFormatter(self, obj):
+        self.formatter = obj
+
+    def close(self):
+        self.log_dict = dict(error=[], info=[], warning=[], debug=[])
+
+    def set_name(self, name):
+        # don't touch _handlers
+        self._name = name
+
+    def acquire(self):
+        pass
+
+    def release(self):
+        pass
+
+    def createLock(self):
+        pass
+
+    def emit(self, record):
+        pass
+
+    def handle(self, record):
+        pass
+
+    def flush(self):
+        pass
+
+    def handleError(self, record):
+        pass
+
+original_syslog_handler = logging.handlers.SysLogHandler
+
+
+def fake_syslog_handler():
+    for attr in dir(original_syslog_handler):
+        if attr.startswith('LOG'):
+            setattr(FakeLogger, attr,
+                    copy.copy(getattr(logging.handlers.SysLogHandler, attr)))
+    FakeLogger.priority_map = \
+        copy.deepcopy(logging.handlers.SysLogHandler.priority_map)
+
+    logging.handlers.SysLogHandler = FakeLogger
+
+
+if get_config('unit_test').get('fake_syslog', 'False').lower() in TRUE_VALUES:
+    fake_syslog_handler()
+
 
 class MockTrue(object):
     """
     Instances of MockTrue evaluate like True
-    Any attr accessed on an instance of MockTrue will return a MockTrue instance
-    Any method called on an instance of MockTrue will return a MockTrue instance
+    Any attr accessed on an instance of MockTrue will return a MockTrue
+    instance. Any method called on an instance of MockTrue will return
+    a MockTrue instance.
 
     >>> thing = MockTrue()
     >>> thing
@@ -140,11 +200,15 @@ class MockTrue(object):
 
     def __getattribute__(self, *args, **kwargs):
         return self
+
     def __call__(self, *args, **kwargs):
         return self
+
     def __repr__(*args, **kwargs):
         return repr(True)
+
     def __eq__(self, other):
         return other is True
+
     def __ne__(self, other):
         return other is not True