Synthetic transaction monitoring demonstrating using WSGI

wsgi.py

import gettext
import logging.handlers
from logging.handlers import SysLogHandler
import socket


class ContextFilter(logging.Filter):
    hostname = socket.gethostname()

    def filter(self, record):
        record.hostname = ContextFilter.hostname
        return True


# Initialize logging components
syslogHandler = SysLogHandler(address=('logsX.papertrailapp.com', XXXXX))
syslogHandler.addFilter(ContextFilter())
syslogFormat = '%(asctime)s %(hostname)s wsgi.py: [%(levelname)s] (%(funcName)s) %(message)s'
formatter = logging.Formatter(syslogFormat, datefmt='%b %d %H:%M:%S')
syslogHandler.setFormatter(formatter)

logger = logging.getLogger()
logger.addHandler(syslogHandler)
logger.setLevel(logging.DEBUG)

logger.debug('Starting WSGI app')


def application(environ, start_response):
    logger.debug('Handling request. Environment vars: %s', environ)

    # If the locale is not present in the URL, redirect the user
    locale = environ['PATH_INFO'][1:3]
    if not locale:
        newlocale = environ['HTTP_ACCEPT_LANGUAGE'][0:2]
        logger.info('Switching to locale: %s', newlocale)
        start_response('302 Found',
                       [('Location', 'http://localhost:8000/' + newlocale)])
        return [b'1']

    logger.info('Locale: %s', locale)

    try:
        translation = gettext.translation('app', localedir='locale', languages=[locale])
        translation.install()

        output = _('Hello world!')
        status = '200 OK'

        logger.info('Got localization string: %s', output)
        response_headers = [('Content-type', 'text/plain'), ('Content-Length', str(len(output)))]
        start_response(status, response_headers)
        return [bytes(output, 'utf-8')]
    except OSError as e:
        logger.exception('Localization error')