RESTfulisation

[restcoda.git] / rest.wsgi

#!/usr/bin/python
# -*- coding: utf-8 -*-

import sys, traceback

# configuration (codes d'accès à la base MS-SQL)
sys.path.append('/home/thomas/public_html/')
import rest_config

# pour savoir quel objet interroger : Routes
from routes import Mapper
from routes.middleware import RoutesMiddleware
# et analyse de query_string (TODO: etudier parse au lieu de cgi)
from cgi import parse_qs

# pour chercher les données sur MS-SQL
from pymssql import connect

# pour afficher le résultat : jinja
from jinja import Environment, FileSystemLoader
from jinja.filters import stringfilter

# TODO systeme de cache : beaker
# from beaker.middleware import CacheMiddleware

# formats de sortie autorisés, et content-type correspondant
# formats = { 'xml': 'application/xml', 'html': 'text/html', 'txt': 'text/plain', 'json': 'application/json', 'rss': 'application/rss+xml' }
formats = { 'xml': 'application/xml', 'html': 'text/html', 'txt': 'text/plain', 'json': 'text/plain', 'rss': 'application/rss+xml' }

# les routes RESTful (cf http://routes.groovie.org/manual.html#restful-services)
mapper = Mapper()
mapper.resource('demlog','demlog')
mapper.resource('comlog','comlog')
mapper.resource('demdep','demdep')
mapper.resource('comdep','comdep')
mapper.resource('dempub','dempub')
mapper.resource('compub','compub')
# TODO à étudier pour permettre les comarexxx
mapper.resource('comare','comare')
mapper.resource('comsra','comsre')

class objetsql(object):
    """objet de base : dispose d'un accès à MS-SQL (lire les données) et d'un accès à jinja (rendu des données)"""
    def __init__(self, environ):
        self.bd = connect(host=rest_config.host,user=rest_config.user,password=rest_config.password,database=rest_config.database)
	self.cursor = self.bd.cursor()
	self.jinja = Environment(loader=FileSystemLoader('/home/thomas/public_html/'))
	self.environ = environ
        self.outputformat = environ['wsgiorg.routing_args'][1].get('format','xml')

class document(objetsql):
    """objet document CODA (demlog, comlog, demdep... ils ont tous le même format)"""
    def __init__(self, environ, code_document='%', basename_template='document'):
        super(document, self).__init__(environ)
        self.code_document = code_document
        self.basename_template = basename_template

    def index(self):
	self.cursor.execute("select top 30 * from auf_v_acces_demcom where code like '%s' order by date_modif desc" % (self.code_document))
	documents={}
	documents['code'] = self.code_document
	documents_liste=[]
	while 1:
	    document = dict_fetchone(self.cursor)
	    if document == None: break
	    document['code_rest'] = coda2rest(document['code'])
	    documents_liste.append(document)
	documents['documents'] = documents_liste
	template = self.jinja.get_template('%s-index.%s' % (self.basename_template, self.outputformat))
	output = template.render(documents)
	return self.outputformat, output

    def show(self):
        id = int(self.environ['wsgiorg.routing_args'][1]['id'])
        self.cursor.execute("select top 1 * from auf_v_acces_demcom where code like '%s' and numero = %d" % (self.code_document, id))
        document = dict_fetchone(self.cursor)
	if document == None:
	    raise "document inexistant"
	document['code_rest'] = coda2rest(document['code'])
        details = []
        self.cursor.execute("select * from auf_v_acces_dtls_demcom where code like '%s' and numero = %d" % (self.code_document, id))
        while 1:
            detail = dict_fetchone(self.cursor)
            if detail == None: break
            details.append(detail)
        document['details']=details
        template = self.jinja.get_template('%s.%s' % (self.basename_template, self.outputformat))
        output = template.render(document)
	return self.outputformat, output

class demlog(document):
    def __init__(self, environ):
        super(demlog, self).__init__(environ, code_document = 'DEM-LOG-AUF')

class comlog(document):
    def __init__(self, environ):
        super(comlog, self).__init__(environ, code_document = 'COM-LOG-AUF')

class demdep(document):
    def __init__(self, environ):
        super(demdep, self).__init__(environ, code_document = 'DEM-DEP-AUF')

class comdep(document):
    def __init__(self, environ):
        super(comdep, self).__init__(environ, code_document = 'COM-DEP-AUF')

class dempub(document):
    def __init__(self, environ):
        super(dempub, self).__init__(environ, code_document = 'DEM-PUB-AUF')

class compub(document):
    def __init__(self, environ):
        super(compub, self).__init__(environ, code_document = 'COM-PUB-AUF')

# TODO : voir la possibilité d'appel de comsre/sn1.rss
class comsre(document):
    def __init__(self, environ):
        super(comsre, self).__init__(environ, code_document = 'COM-SRE-%')

class comare(document):
    def __init__(self, environ):
        super(comare, self).__init__(environ, code_document = 'COM-ARE-%')


def dispatcher(environ, start_response):
    """sera lancée par mod_wsgi"""
    if environ.has_key('QUERY_STRING'):
        environ['org.auf.filters'] = parse_qs(environ['QUERY_STRING'])
    else:
        environ['org.auf.filters'] = {}
    results = environ['wsgiorg.routing_args'][1]
    try:
        target_class = globals()[results['controller']]
	method_name = results['action']
        method = getattr(target_class,method_name)
        type, output = method(target_class(environ))
	start_response("200 OK", [('Content-type', formats[type])])
        return output.encode('utf-8')
    except:
        start_response("404 NOT FOUND", [('Content-type', 'text/plain')])
        return 'erreur lors du traitement\n%s: %s\n%s' % ( sys.exc_info()[0] , sys.exc_info()[1] , traceback.format_exc())

application = RoutesMiddleware( dispatcher, mapper)


#
# petits utilitaires
#
def dict_fetchone(cursor):
    """Renvoie le resultat d'un fetchone dans un dictionnaire"""
    result = cursor.fetchone()
    if result == None: return None
    result_dict = {}
    for i in range(len(result)):
        if isinstance( result[i], str ):
	    result_dict[cursor.description[i][0]] = result[i].decode('iso-8859-1')
	else:
            result_dict[cursor.description[i][0]] = result[i]
    return result_dict

import re 
p = re.compile('(dem|com)-(...)-auf',re.IGNORECASE)
def coda2rest(value):
    """Traduit un nom CODA en l'objet correspodant, par exemple DEM-LOG-AUF en demlog"""
    m = p.search(value)
    if m == None: return value
    return m.group(1).lower() + m.group(2).lower()