Subversion Repositories SmartDukaan

'''

Created on 27-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 time import *

from datastore.DataCodeAccessor import *

from datastore.DataAccessor import *

import urllib

from html2text.unescaping import *

class naaptol_price(BaseSpider):

    """

    Documentation for class naaptol_price

    Since the urls collected in the previous spider for naaptol.com

    are redirected to get the data for individual phones.

    Some are of the form "http://www.naaptol.com/features/10417-Fly-E300.html"

    while others are of the form "http://www.naaptol.com/price/10417-Fly-E300.html".

    So to make data extraction symmetric, this spider will accomplish 2 tasks

    First, for the urls conatining 'features' it collects the information for the 

    individual phones and store them in table datastore_datadefinition_naaptol_phones

    for the ones conatining 'prices' in the url, a new url having 'price' repalced  

    with 'features' is framed and stored in the table datastore_datadefinition_morenaaptol_urls.

    """

    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()

       #NAAPTOL_DOMAINNAME1 = "naaptol1"   

       NAAPTOL_DOMAINNAME1 = get_code_word("NAAPTOL_DOMAINNAME1")

       self.domain_name = NAAPTOL_DOMAINNAME1 

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

       da = DataHelper()

       #url = "http://www.naaptol.com/features/10417-Fly-E300.html"

       #self.start_urls.append(url)

       for pitem in da.get_allnaaptolurls():

            self.start_urls.append(pitem.url.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 = []

        #NAAPTOL_REFERER = "http://www.google.com"

        NAAPTOL_REFERER = get_code_word("NAAPTOL_REFERER")

        for url1 in self.start_urls:

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

            request.headers.setdefault("Referer", NAAPTOL_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

        Xpath2 = Give us price-range for individual phone

        Xpath3 = Give us price-range for individual phone, if unable to retrieve from xpath2

        Xpath4 = Give us number of onlinesellers for a particular phone

        Xpath5 = Give us price for a particular phone offered by onlinesellers

        Xpath6 and Xpath7 = Give us name of onlinesellers for a particular phone 

        Xpath8 = Give us number of offlinesellers for a particular phone

        Xpath9 = Give us price for a particular phone offered by offlinesellers

        Xpath10 = Give us name of offlinesellers for a particular phone

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

        chklist2 = contains what needs to be replaced, presently it conatains 'price'

        part = contains 'features'

        """

        # there are two different type of urls one contains feature and other one contains price

        #both have to be processed differently

        msg(response.url)

        site = response.url

        site = unescape(site)

        sp1 = site.rfind("/")

        sp2 = site.rfind("/",0,sp1-1)

        catg = site[sp2+1:sp1]

        da = DataHelper()

        #change price to features and add to urls as both provide the same data but in different formats

        #otherwise crawl the url containing features

        #NAAPTOL_CHKLIST2 = ['price']

        #list separated by ';'

        NAAPTOL_CHKLIST2 = str(get_code_word("NAAPTOL_CHKLIST2"))

        if len(NAAPTOL_CHKLIST2)>0:

            NAAPTOL_CHKLIST2 = NAAPTOL_CHKLIST2.split(';')

        #NAAPTOL_PART = "features"

        NAAPTOL_PART = get_code_word("NAAPTOL_PART")

        #NAAPTOL_REMOVELIST = ["Rs.",","]

        NAAPTOL_REMOVELIST = str(get_code_word("NAAPTOL_REMOVELIST"))

        if len(NAAPTOL_REMOVELIST)>0:

            NAAPTOL_REMOVELIST = NAAPTOL_REMOVELIST.split(';')

        for c in NAAPTOL_CHKLIST2:

            if c == catg:

                site = site.replace(c,NAAPTOL_PART)

                da.add_morenaaptolurl(site)

        if catg == NAAPTOL_PART:    

            #retreiving name from the the url

            name = str(response.url)

            name = unescape(name)

            name_pos = name.rfind("/")

            name = name[name_pos+1:len(name)-5]

            name_pos = name.find("-")

            name = name[name_pos+1:len(name)]

            hxs = HtmlXPathSelector(response)  

            #price and price2 determine range

            #NAAPTOL_XPATH2 = '//table[@class ="ProductDetails"]//td[@class="Price"]/span/text()'

            NAAPTOL_XPATH2 = get_code_word("NAAPTOL_XPATH2")

            prices = hxs.select(NAAPTOL_XPATH2)

            try:

                price1 = prices.extract()[0]

                price1 = price1.strip()

            except:

                price1 = ""

            try:

                price2 = prices.extract()[1]

                price2 = price2.strip()

            except:

                price2 = ""  

            try:

                if price1 == "" and price2 == "":

                    #NAAPTOL_XPATH3 = '//table[@class ="ProductDetails"]//td[@class="Price"]/span/script/text()'

                    NAAPTOL_XPATH3 = get_code_word("NAAPTOL_XPATH3")

                    prices = hxs.select(NAAPTOL_XPATH3)

                    price = str(prices.extract()[0])

                    pos1 = price.find("'")

                    pos2 = price.find("'",pos1+1,len(price))

                    price1 = price[pos1+1:pos2] + "(approx)" 

                    price2 = ""

            except:

                price1 = price2 = ""

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

            if price1 != '':

                for r in NAAPTOL_REMOVELIST: 

                    while price1.find(r) != -1:

                        price1 = price1.replace(r, "")

                price1 = price1.strip()

            if price2 != '':        

                for r in NAAPTOL_REMOVELIST: 

                    while price2.find(r) != -1:

                        price2 = price2.replace(r, "")

                price2 = price2.strip()

            if price1 == "Rates Not Available":

                price1 = price2 = ""

            #range = price1 to price2

            range = price1

            if price2 != "":

                range = str(range) + " to " 

                range = range + str(price2) 

            da.add_new_naaptolphone(name, str(range))

            OnlineSellers_pricelist = []

            OnlineSellers_namelist = []

            try:

                #ct1 holds the count of online sellers

                #NAAPTOL_XPATH4 = '//div[@id="OnlineSellers"]//div[@class="ProductResultHead"]//div[@class="headingstyle"]/text()'

                NAAPTOL_XPATH4 = get_code_word("NAAPTOL_XPATH4")

                ct1 = hxs.select(NAAPTOL_XPATH4)

                ct1 = str(ct1.extract()[0])

                ct1 = ct1.decode("utf-8")

                ct1 = ct1.strip()

                ps1 = ct1.find(" ")

                ct1 = ct1[0:ps1]

                ct1 = int(ct1)

            except:

                ct1 = 0

            ct = ct1

            i = 0

            #NAAPTOL_XPATH5 = '//div[@id="onSellerContents"]//td[@class="price"]'

            NAAPTOL_XPATH5 = get_code_word("NAAPTOL_XPATH5")

            os_info = hxs.select(NAAPTOL_XPATH5)

            while ct > 0:

                os = os_info[i].extract()

                ps1 = os.find(">")

                ps2 = os.find("<",ps1)

                os = os[ps1+1:ps2]

                if os != '':        

                    for r in NAAPTOL_REMOVELIST: 

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

                            os = os.replace(r, "")

                os = urllib.unquote(os)

                try:

                    os = int(os)

                except:

                    #stored in format different than previous one

                    os = os_info[i].extract()

                    ps1 = os.find(">",ps2)

                    ps2 = os.find("<",ps1)

                    os = os[ps1+1:ps2]

                    if os != '':        

                        for r in NAAPTOL_REMOVELIST: 

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

                                os = os.replace(r, "")

                    os = urllib.unquote(os)

                    os = int(os) 

                OnlineSellers_pricelist.append(os)

                #NAAPTOL_XPATH6 = '//div[@id="onSellerContents"]//tr[@class="DottedBorder"]/td/a[@id="storeInfoPop'  

                NAAPTOL_XPATH6 = get_code_word("NAAPTOL_XPATH6")

                #NAAPTOL_XPATH7 = '"]/span/text()'

                NAAPTOL_XPATH7 = get_code_word("NAAPTOL_XPATH7")

                NAAPTOL_XPATH6 = NAAPTOL_XPATH6 + str(i) 

                NAAPTOL_XPATH6 = NAAPTOL_XPATH6 + NAAPTOL_XPATH7 

                path = NAAPTOL_XPATH6

                osname = hxs.select(path)

                osname = osname.extract()[0]

                osname = unescape(osname)

                osname = urllib.unquote(osname)

                OnlineSellers_namelist.append(osname)

                i = i+1

                ct = ct-1

            l = len(OnlineSellers_pricelist)

            i = 0 

            nid = da.get_naaptolphone(name,range).id

            while l > 0:

                da.add_new_ntonlinesp(nid, OnlineSellers_namelist[i], OnlineSellers_pricelist[i])

                i = i+1

                l = l-1

            LocalSellers_pricelist = []   

            LocalSellers_namelist = []

            try:

                #ct1 holds the count of online sellers

                #NAAPTOL_XPATH8 = '//div[@id="LocalStores"]//div[@class="ProductResultHead"]//div[@class="headingstyle"]/text()'

                NAAPTOL_XPATH8 = get_code_word("NAAPTOL_XPATH8")

                ct1 = hxs.select(NAAPTOL_XPATH8)

                ct1 = str(ct1.extract()[0])

                ct1 = ct1.decode("utf-8")

                ct1 = ct1.strip()

                ps1 = ct1.find(" ")

                ct1 = ct1[0:ps1]

                ct1 = int(ct1)

            except:

                ct1 = 0

            ct = ct1

            i = 0

            #NAAPTOL_XPATH9 = '//div[@id="offSellerContents"]//td[@class="price"]'

            NAAPTOL_XPATH9 = get_code_word("NAAPTOL_XPATH9")

            #NAAPTOL_XPATH10 = '//div[@id="offSellerContents"]//span[@class="LocalStoreHeading"]/text()'

            NAAPTOL_XPATH10 = get_code_word("NAAPTOL_XPATH10")

            os_info = hxs.select(NAAPTOL_XPATH9)

            os_names = hxs.select(NAAPTOL_XPATH10)

            while ct > 0:

                os = os_info[i].extract()

                osname = os_names[i].extract() 

                ps1 = os.find(">")

                ps2 = os.find("<",ps1)

                os = os[ps1+1:ps2]

                if os != '':        

                    for r in NAAPTOL_REMOVELIST: 

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

                            os = os.replace(r, "")

                os = urllib.unquote(os)

                osname = urllib.unquote(osname)

                osname = unescape(osname)

                try:

                    os = int(os)

                except:

                    #stored in format different than previous one

                    os = os_info[i].extract()

                    ps1 = os.find(">",ps2)

                    ps2 = os.find("<",ps1)

                    os = os[ps1+1:ps2]

                    if os != '':        

                        for r in NAAPTOL_REMOVELIST: 

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

                                os = os.replace(r, "")

                    os = urllib.unquote(os)

                    os = int(os)        

                LocalSellers_pricelist.append(os)

                LocalSellers_namelist.append(osname)

                i = i+1

                ct = ct-1

            l = len(LocalSellers_pricelist)

            i = 0

            nid = da.get_naaptolphone(name,range).id

            while l > 0:

                da.add_new_ntofflinesp(nid, LocalSellers_namelist[i], LocalSellers_pricelist[i])

                i = i+1

                l = l-1

SPIDER = naaptol_price()