Subversion Repositories SmartDukaan

'''

Created on 14-May-2010

@author: gaurav

'''

from scrapy.spider import BaseSpider

from scrapy.selector import HtmlXPathSelector

from scrapy.http import Request

from demo.items import DemoItem

from scrapy.contrib.spidermiddleware import referer

from scrapy.http.headers import Headers

from scrapy.http.request.form import FormRequest

from scrapy.log import msg

from scrapy.http.response import Response

from datastore.DataCodeAccessor import *

from datastore.DataAccessor import *

from html2text.unescaping import *

class univercell_price(BaseSpider):

    """

    Documentation for class univercell_price

    This spider collects the information for the individual phones

    and store them in table datastore_datadefinition_univercell_items

    """

    def __init__(self):

       """

        Documentation for constructor

        initialize_table is called to make all the tables known in

        the scope of this class.

        Also start url needs to be feeded to the spider through start_urls.append

        Domainname1 is name by which this spider is known outside

        So this will be used as an argument for calling this spider 

        """ 

       initialize_table()

       #UNIVERCELL_DOMAINNAME1 = "univercell1"   

       UNIVERCELL_DOMAINNAME1 = get_code_word("UNIVERCELL_DOMAINNAME1")

       self.domain_name = UNIVERCELL_DOMAINNAME1 

       # get urls from the database and append them in the list for crawling

       da = DataHelper()

       for pitem in da.get_all_univervendors():

            self.start_urls.append(pitem.v_site.strip())

    def start_requests(self):

        """

        Documentation for method start_requests

        To set various properties of the request to be made

        like referer, headers and all.

        @return a list of well formed requests which will be 

        crawled by spider and spider will return the response

        """

        #for each request a referer has to be set

        listreq = []

        #UNIVERCELL_REFERER = "www.google.com/search"

        UNIVERCELL_REFERER = get_code_word("UNIVERCELL_REFERER")

        for url1 in self.start_urls:

            request = Request(url = str(url1), callback=self.parse)

            request.headers.setdefault("Referer", UNIVERCELL_REFERER)

            listreq.append(request)

        return listreq

    def parse(self, response):

        """

        Documentation for method parse

        @param response of individual requests

        Using Xpaths needed information is extracted out of the response

        and added to the database

        Xpath4 = Give us section for individual phone

        Xpath5 = Give us name for individual phone

        Xpath6 = Give us quoted-price for individual phone

        vatplustax = Give us final_price for individual phone on adding with quoted-price

        Removelist = To filer the prices so as to make them integer for eg remove ',' or 'Rs'

        """

        da = DataHelper()

        #UNIVERCELL_VATPLUSTAX = 0

        #removelist is used for converting price to decimal format containing only numbers and '.'

        #UNIVERCELL_REMOVELIST = ["Rs",",","-","/"]

        #list separated by ';'

        UNIVERCELL_REMOVELIST = get_code_word("UNIVERCELL_REMOVELIST")

        UNIVERCELL_REMOVELIST = UNIVERCELL_REMOVELIST.split(';')

        hxs = HtmlXPathSelector(response)

        #UNIVERCELL_XPATH4 = '//td[@class="gray-border"]' 

        UNIVERCELL_XPATH4 = get_code_word("UNIVERCELL_XPATH4")

        sites = hxs.select(UNIVERCELL_XPATH4)

        items = []

        for site in sites:

            item = {}

            #UNIVERCELL_XPATH5 = './/tr[2]/td/a/text()'

            UNIVERCELL_XPATH5 = get_code_word("UNIVERCELL_XPATH5")

            item['title'] = site.select(UNIVERCELL_XPATH5)[0].extract()

            #UNIVERCELL_XPATH6 = './/tr[3]/th/label/text()'

            UNIVERCELL_XPATH6 = get_code_word("UNIVERCELL_XPATH6")

            item['price'] =site.select(UNIVERCELL_XPATH6)[0].extract()

            items.append(item)

        for i in items:

            str1 = str(i['title']).strip()

            amnt = i['price']

            if amnt != '':        

                for r in UNIVERCELL_REMOVELIST: 

                    while amnt.find(r) != -1:

                        amnt = amnt.replace(r, "")

            amnt = amnt.strip() 

            # 4% additional vat is there on the price

            UNIVERCELL_VATPLUSTAX = 4*int(amnt)/100

            pr = int(amnt) + UNIVERCELL_VATPLUSTAX 

            #adding model-name,quotedprice and finalprice

            da.add_new_univerphone(unescape(str1),amnt,pr) 

SPIDER = univercell_price()