def do_item_lookup(self, group='Images,ItemAttributes,EditorialReview'):
''' Perform an ItemLookup operation. Will raise an exception if asin is None or empty '''
if self.asin == None or len(self.asin) == 0:
raise(AwsSearchException("ASIN must be provided for do_item_lookup"))
''' Create and sign the URL. For the AWS URL we must create the SearchIndex parameter '''
search_params = {}
search_params['IdType'] = 'ASIN'
search_params['ItemId'] = self.asin
search_params['ResponseGroup'] = group
''' And of course need the operation '''
search_params['Operation'] = 'ItemLookup'
aws_url = AwsUrl( 'GET', params = search_params, tag = self.tag, key = self.key, secret = self.secret )
''' Sign the URL '''
url_signed = aws_url.signed_url()
f = urlopen( url_signed )
self.search_result_dom = parse(f)
f.close()
if self.search_result_dom != None:
''' Get what should be the only item and return it '''
items = self.search_result_dom.getElementsByTagName('Item')
if items == None:
return None
else:
for i in items:
''' Better be only one so assume there is. If AWS gets
that broken then what could we do but return the first anyway? '''
return i
else:
return None
def do_search(self):
'''
Perform the search given the provided parameters. The result is returned as
a minidom object but it is probably more useful to use the other methods
such as get_small_image, get_item_asin, get_detail_page_url, etc. than
to work with the raw dom result.
NOTE: The search might "succeed" in the sense that it returns some XML
but that doesn't mean it was truly successful. One should always
call get_errors() to see if there were any errors
'''
''' Create and sign the URL. For the AWS URL we must create the SearchIndex parameter '''
self.search_params['SearchIndex'] = self.search_index
''' And the ResponseGroup
TODO: Should make parameter too but this could be default
'''
self.search_params['ResponseGroup'] ='Images,ItemAttributes'
''' And of course need the operation '''
self.search_params['Operation'] = 'ItemSearch'
aws_url = AwsUrl( 'GET', params = self.search_params, tag = self.tag, key = self.key, secret = self.secret )
''' Sign the URL '''
url_signed = aws_url.signed_url()
if self.verbose:
print 'AWS URL: ', url_signed
f = urlopen( url_signed )
self.search_result_dom = parse(f)
f.close()
''' NOTE: There might be an error in the search. The caller
should check with get_errors
'''
return self.search_result_dom