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#!/usr/bin/env python
# -*- encoding: utf-8 -*-
from urlparse import urlparse, parse_qs
from .third_libs.link_header import parse_link_value
class Method(object):
def __init__(self, method, request, **method_args):
self.method = method
self.request = request
self.args = method_args
self.cache = {}
def cached(func):
def wrapper(self, page=1):
if str(page) in self.cache:
return self.cache[str(page)]
return func(self, page)
return wrapper
def if_needs_lastpage(func):
def wrapper(self, response):
has_link = response.headers.get('link')
has_last_page = hasattr(self, 'last_page')
if not has_last_page and has_link:
return func(self, response)
elif not has_last_page and not has_link:
self.last_page = 1
return wrapper
@if_needs_lastpage
def __set_last_page_from(self, response):
link_parsed = parse_link_value(response.headers['link'])
def get_last(url):
url_rels = link_parsed[url]
return (url_rels.get('rel') == 'last')
url_last = filter(get_last, link_parsed)
query = urlparse(url_last.pop()).query
self.last_page = int(parse_qs(query).get('page').pop())
@cached
def __call__(self, page=1):
all_args = self.args.copy()
all_args.update(page=page)
response = self.method(self.request, **all_args)
self.__set_last_page_from(response)
resource = self.request.resource
self.cache[str(page)] = resource.loads(response.content)
return self.cache[str(page)]
@property
def last(self):
if not hasattr(self, 'last_page'):
self()
return self.last_page
class Page(object):
""" """
def __init__(self, getter, page=1):
""" """
self.getter = getter
self.page = page
def __iter__(self):
return self
def __add__(self, number):
return self.page + number
def __radd__(self, number):
return number + self.page
def __sub__(self, number):
return self.page - number
def __rsub__(self, number):
return number - self.page
def __lt__(self, number):
return self.page < number
def __le__(self, number):
return self.page <= number
def __eq__(self, number):
return self.page == number
def __ne__(self, number):
return self.page != number
def __gt__(self, number):
return self.page > number
def __ge__(self, number):
return self.page >= number
@property
def resources(self):
return getattr(self, '_count', None) or u"~"
def get_content(func):
def wrapper(self):
if not hasattr(self, '_count'):
content = self.getter(self.page)
self._count = len(content)
self.iterable = iter(content)
return func(self)
return wrapper
@get_content
def __next__(self):
try:
return self.iterable.next()
except StopIteration:
self.iterable = iter(self.getter(self.page))
raise StopIteration
def next(self):
return self.__next__()
def __str__(self):
return '<{name}{page} resources={resources}>'.format(
name=self.__class__.__name__,
page=self.page,
resources=self.resources)
def __repr__(self):
return "%s[%d]" % (self.__str__(), id(self))
class Result(object):
""" """
def __init__(self, client, request, **kwargs):
""" """
self.getter = Method(client.get, request, **kwargs)
self.page = Page(self.getter)
def __iter__(self):
return self
def __next__(self):
if self.page <= self.pages:
page_to_return = self.page
self.page = Page(self.getter, page_to_return + 1)
return page_to_return
self.page = Page(self.getter)
raise StopIteration
def next(self):
return self.__next__()
@property
def pages(self):
return self.getter.last
def get_page(self, page):
if page in xrange(1, self.pages + 1):
return Page(self.getter, page)
return None
def iterator(self):
for page in self:
for resource in page:
yield resource
def all(self):
return list(self.iterator())
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