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 = str(get_code_word("UNIVERCELL_REMOVELIST"))
        if len(UNIVERCELL_REMOVELIST)>0:
            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()