using uwsgi_handler in virtualenv cause some import error

it might not be caused by the handler, but the uwsgi module itself.

LOGGING_CONFIG = {
    'version': 1,
    'formatters': {
        'rawformatter': {
            'class': 'logging.Formatter',
            'format': '%(message)s'
        }
    },
    'handlers': {
        'sls_handler': {
            '()': 'aliyun.log.UwsgiQueuedLogHandler',
            'level': 'INFO',
            'formatter': 'rawformatter',

            # custom args:
            'end_point': settings.DATAENTRY_ENDPOINT,
            'access_key_id': base64.b64decode(settings.DATAENTRY_ACCESS_ID),
            'access_key': base64.b64decode(settings.DATAENTRY_ACCESS_KEY),
            'project': app.config["ALIYUN_LOG_PROJECT"],
            'log_store': app.config["ALIYUN_LOG_LOGSTORE"]
        },
        "file": {
            "level": "DEBUG",
            "class": "logging.handlers.TimedRotatingFileHandler",
            "filename": app.config["LOG_INFO_FILE"],
            "when": "midnight",
            "formatter": "rawformatter",
            "encoding": "utf-8",
        },
        "file_error": {
            "level": "ERROR",
            "class": "logging.handlers.TimedRotatingFileHandler",
            "when": "midnight",
            "filename": app.config["LOG_ERROR_FILE"],
            "formatter": "rawformatter",
            "encoding": "utf-8",
        },
        "console": {
            "level": "NOTSET",
            "class": "logging.StreamHandler",
            "stream": sys.stderr,
            "formatter": "rawformatter"
        }
    },
    'loggers': {
        'sls': {
            'handlers': ['sls_handler', 'file', 'console'],
            'level': 'INFO',
            'propagate': False
        },
        'file': {
            "handlers": ['console', 'file', 'file_error'],
            "level": "DEBUG",
            "propagate": False,
        }
    }
}

Traceback (most recent call last):
  File "/Applications/PyCharm.app/Contents/helpers/pydev/pydevd.py", line 1664, in <module>
    main()
  File "/Applications/PyCharm.app/Contents/helpers/pydev/pydevd.py", line 1658, in main
    globals = debugger.run(setup['file'], None, None, is_module)
  File "/Applications/PyCharm.app/Contents/helpers/pydev/pydevd.py", line 1068, in run
    pydev_imports.execfile(file, globals, locals)  # execute the script
  File "/Users/gelin/antsophon-backend/core/log.py", line 76, in <module>
    logging.config.dictConfig(LOGGING_CONFIG)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/logging/config.py", line 794, in dictConfig
    dictConfigClass(config).configure()
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/logging/config.py", line 576, in configure
    '%r: %s' % (name, e))
ValueError: Unable to configure handler u'sls_handler': No module named uwsgi

Start with the logging.config.dictConfig call in core/log.py and reproduce the traceback in the reported Python 2.7 virtualenv. Check whether the uwsgi import is required by the handler or unavailable in this environment. Done means the cause is identified and the handler either configures successfully in a supported setup or the limitation is clearly documented.