application_wnslib.py

# -*- coding: utf-8 -*-
# ===============================================================================
#
# Authors: Massimiliano Cannata, Milan Antonovic
#
# Copyright (c) 2015 IST-SUPSI (www.supsi.ch/ist)
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
#
# ===============================================================================

from urlparse import parse_qs
from wnslib import resourceFactory
import sys
import traceback
import config
import logging, logging.config, logging.handlers


def executeWns(environ, start_response):

    # Intitializing logging ----------------------------------------------------
    
    '''formatter = logging.Formatter('%(asctime)-6s: %(name)s - %(levelname)s - %(message)s')
    log_filename = path.join(config.errorlog_path,"wns.log")
    handler = logging.handlers.RotatingFileHandler(filename=log_filename, maxBytes = 1024*1024, backupCount = 20)
    handler.setFormatter(formatter)
    logger = logging.getLogger('istsos')
    
    if len(logger.handlers) == 0:
        logger.addHandler(handler)
        
    elif len(logger.handlers) == 1 and type(logger.handlers[0])==type(handler):
        pass
        
    else:
        for h in logger.handlers:
            logger.removeHandler(h)
        logger.addHandler(handler)

    if config.errorlog_level == "INFO":
        logger.setLevel(logging.INFO)
        
    elif config.errorlog_level == "ERROR":
        logger.setLevel(logging.ERROR)
        
    else:
        logger.setLevel(logging.UNSET)'''
        
    wsgi_response = "Hello istWNS"
    wsgi_mime = 'text/plain'
    wsgi_status = '200 OK'

    wnsEnviron = {
        "path": environ['PATH_INFO'][3:],
        "method": str(environ['REQUEST_METHOD']).upper(),
        "pathinfo": environ['PATH_INFO'].strip()[4:].split("/"),
        "wsgi_input": environ['wsgi.input'].read(int(environ["CONTENT_LENGTH"])) if environ.get("CONTENT_LENGTH") else None,
        "url_scheme": environ['wsgi.url_scheme'],
        "http_host": environ['HTTP_HOST'] if environ.get('HTTP_HOST') else None,
        "server_name": environ['SERVER_NAME'],
        "server_port": environ['SERVER_PORT'],
        "script_name": environ['SCRIPT_NAME'] if environ.get('SCRIPT_NAME', '') else None,
        "parameters": parse_qs(environ['QUERY_STRING']) if environ.get('QUERY_STRING') else None,
        "services_path": config.services_path,
    }
    
    if 'HTTP_AUTHORIZATION' in environ:
        wnsEnviron['HTTP_AUTHORIZATION'] = environ['HTTP_AUTHORIZATION']

    try:

        try:
            op = None
            op = resourceFactory.initResource(wnsEnviron)

            try:
                if op.response['success']:

                    method = str(environ['REQUEST_METHOD']).upper()
                    # Data RETRIEVAL
                    if method == "GET":
                        op.executeGet()

                    # Data UPDATE
                    elif method == "POST":
                        op.executePost()

                    # Data INSERT
                    elif method == "PUT":
                        op.executePut()

                    # Data DELETE
                    elif method == "DELETE":
                        op.executeDelete()

                    else:
                        raise Exception("HTTP method %s not supported" % wnsEnviron["method"])

                    '''if 'log' in op.response:
                        logger.info("Executing %s on %s: %s" % (wnsEnviron["method"],
                            environ['PATH_INFO'], str(op.response['log'])))

                    if 'message' in op.response:
                        logger.info("Executing %s on %s: %s" % (wnsEnviron["method"],
                         environ['PATH_INFO'], str(op.response['message'])))'''

            except Exception as exe:
                print >> sys.stderr, traceback.print_exc()
                '''logger.error("Executing %s on %s: %s" % (wnsEnviron["method"],
                                 environ['PATH_INFO'], str(exe)))'''
                op.setException(str(exe))

        except Exception as exe:
            print >> sys.stderr, traceback.print_exc()
            '''logger.error("On initialization %s on %s: %s" % (wnsEnviron["method"],
                                 environ['PATH_INFO'], str(exe)))'''
            from walib import resource
            op = resource.waResource(wnsEnviron)
            op.setException(str(exe))

        try:
            wsgi_response = op.getResponse()
        except Exception as exe:
            print >> sys.stderr, traceback.print_exc()
            '''logger.error("Executing %s on %s: %s" % (wnsEnviron["method"],
                                 environ['PATH_INFO'], str(exe)))'''
            op.setException("Error converting response to json")

        wsgi_mime = "application/json"

    except Exception as e:
        print >> sys.stderr, traceback.print_exc()
        '''logger.error("Executing %s on %s: %s" % (wnsEnviron["method"],
                                 environ['PATH_INFO'], str(e)))'''
        wsgi_response = str(e)
        wsgi_mime = 'text/plain'
        wsgi_status = '400 Bad Request'

    wsgi_headers = [
        ('Content-Type', "%s; charset=utf-8" % wsgi_mime),
        ('Content-Length', str(len(wsgi_response)))
    ]
    start_response(wsgi_status, wsgi_headers)
    return [wsgi_response]