Files
PyGithub/github/PaginatedList.py
T
Steve Kowalik dd31a70659 Silence most ResourceWarnings (#1393)
A few test classes were failing to call tearDown() of the superclass,
which meant the file descriptors of their replydata files were leaking.
Make sure to call it, and switch every other callsite of superclasses by
name to using argument-less super().

Revert an AllTests change that snuck in during release.
2020-02-12 15:05:32 +11:00

258 lines
9.7 KiB
Python

# -*- coding: utf-8 -*-
############################ Copyrights and license ############################
# #
# Copyright 2012 Vincent Jacques <vincent@vincent-jacques.net> #
# Copyright 2012 Zearin <zearin@gonk.net> #
# Copyright 2013 AKFish <akfish@gmail.com> #
# Copyright 2013 Bill Mill <bill.mill@gmail.com> #
# Copyright 2013 Vincent Jacques <vincent@vincent-jacques.net> #
# Copyright 2013 davidbrai <davidbrai@gmail.com> #
# Copyright 2014 Thialfihar <thi@thialfihar.org> #
# Copyright 2014 Vincent Jacques <vincent@vincent-jacques.net> #
# Copyright 2015 Dan Vanderkam <danvdk@gmail.com> #
# Copyright 2015 Eliot Walker <eliot@lyft.com> #
# Copyright 2016 Peter Buckley <dx-pbuckley@users.noreply.github.com> #
# Copyright 2017 Jannis Gebauer <ja.geb@me.com> #
# Copyright 2018 Gilad Shefer <gshefer@redhat.com> #
# Copyright 2018 Joel Koglin <JoelKoglin@gmail.com> #
# Copyright 2018 Wan Liuyang <tsfdye@gmail.com> #
# Copyright 2018 sfdye <tsfdye@gmail.com> #
# #
# This file is part of PyGithub. #
# http://pygithub.readthedocs.io/ #
# #
# PyGithub is free software: you can redistribute it and/or modify it under #
# the terms of the GNU Lesser General Public License as published by the Free #
# Software Foundation, either version 3 of the License, or (at your option) #
# any later version. #
# #
# PyGithub is distributed in the hope that it will be useful, but WITHOUT ANY #
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS #
# FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more #
# details. #
# #
# You should have received a copy of the GNU Lesser General Public License #
# along with PyGithub. If not, see <http://www.gnu.org/licenses/>. #
# #
################################################################################
from urllib.parse import parse_qs
class PaginatedListBase:
def __init__(self):
self.__elements = list()
def __getitem__(self, index):
assert isinstance(index, (int, slice))
if isinstance(index, int):
self.__fetchToIndex(index)
return self.__elements[index]
else:
return self._Slice(self, index)
def __iter__(self):
for element in self.__elements:
yield element
while self._couldGrow():
newElements = self._grow()
for element in newElements:
yield element
def _isBiggerThan(self, index):
return len(self.__elements) > index or self._couldGrow()
def __fetchToIndex(self, index):
while len(self.__elements) <= index and self._couldGrow():
self._grow()
def _grow(self):
newElements = self._fetchNextPage()
self.__elements += newElements
return newElements
class _Slice:
def __init__(self, theList, theSlice):
self.__list = theList
self.__start = theSlice.start or 0
self.__stop = theSlice.stop
self.__step = theSlice.step or 1
def __iter__(self):
index = self.__start
while not self.__finished(index):
if self.__list._isBiggerThan(index):
yield self.__list[index]
index += self.__step
else:
return
def __finished(self, index):
return self.__stop is not None and index >= self.__stop
class PaginatedList(PaginatedListBase):
"""
This class abstracts the `pagination of the API <http://developer.github.com/v3/#pagination>`_.
You can simply enumerate through instances of this class::
for repo in user.get_repos():
print(repo.name)
If you want to know the total number of items in the list::
print(user.get_repos().totalCount)
print(len(user.get_repos()))
You can also index them or take slices::
second_repo = user.get_repos()[1]
first_repos = user.get_repos()[:10]
If you want to iterate in reversed order, just do::
for repo in user.get_repos().reversed:
print(repo.name)
And if you really need it, you can explicitly access a specific page::
some_repos = user.get_repos().get_page(0)
some_other_repos = user.get_repos().get_page(3)
"""
def __init__(
self,
contentClass,
requester,
firstUrl,
firstParams,
headers=None,
list_item="items",
):
super().__init__()
self.__requester = requester
self.__contentClass = contentClass
self.__firstUrl = firstUrl
self.__firstParams = firstParams or ()
self.__nextUrl = firstUrl
self.__nextParams = firstParams or {}
self.__headers = headers
self.__list_item = list_item
if self.__requester.per_page != 30:
self.__nextParams["per_page"] = self.__requester.per_page
self._reversed = False
self.__totalCount = None
@property
def totalCount(self):
if not self.__totalCount:
params = {} if self.__nextParams is None else self.__nextParams.copy()
# set per_page = 1 so the totalCount is just the number of pages
params.update({"per_page": 1})
headers, data = self.__requester.requestJsonAndCheck(
"GET", self.__firstUrl, parameters=params, headers=self.__headers
)
if "link" not in headers:
if data and "total_count" in data:
self.__totalCount = data["total_count"]
elif data:
self.__totalCount = len(data)
else:
self.__totalCount = 0
else:
links = self.__parseLinkHeader(headers)
lastUrl = links.get("last")
self.__totalCount = int(parse_qs(lastUrl)["page"][0])
return self.__totalCount
def _getLastPageUrl(self):
headers, data = self.__requester.requestJsonAndCheck(
"GET", self.__firstUrl, parameters=self.__nextParams, headers=self.__headers
)
links = self.__parseLinkHeader(headers)
lastUrl = links.get("last")
return lastUrl
@property
def reversed(self):
r = PaginatedList(
self.__contentClass,
self.__requester,
self.__firstUrl,
self.__firstParams,
self.__headers,
self.__list_item,
)
r.__reverse()
return r
def __reverse(self):
self._reversed = True
lastUrl = self._getLastPageUrl()
if lastUrl:
self.__nextUrl = lastUrl
def _couldGrow(self):
return self.__nextUrl is not None
def _fetchNextPage(self):
headers, data = self.__requester.requestJsonAndCheck(
"GET", self.__nextUrl, parameters=self.__nextParams, headers=self.__headers
)
data = data if data else []
self.__nextUrl = None
if len(data) > 0:
links = self.__parseLinkHeader(headers)
if self._reversed:
if "prev" in links:
self.__nextUrl = links["prev"]
elif "next" in links:
self.__nextUrl = links["next"]
self.__nextParams = None
if self.__list_item in data:
self.__totalCount = data.get("total_count")
data = data[self.__list_item]
content = [
self.__contentClass(self.__requester, headers, element, completed=False)
for element in data
if element is not None
]
if self._reversed:
return content[::-1]
return content
def __parseLinkHeader(self, headers):
links = {}
if "link" in headers:
linkHeaders = headers["link"].split(", ")
for linkHeader in linkHeaders:
(url, rel) = linkHeader.split("; ")
url = url[1:-1]
rel = rel[5:-1]
links[rel] = url
return links
def get_page(self, page):
params = dict(self.__firstParams)
if page != 0:
params["page"] = page + 1
if self.__requester.per_page != 30:
params["per_page"] = self.__requester.per_page
headers, data = self.__requester.requestJsonAndCheck(
"GET", self.__firstUrl, parameters=params, headers=self.__headers
)
if self.__list_item in data:
self.__totalCount = data.get("total_count")
data = data[self.__list_item]
return [
self.__contentClass(self.__requester, headers, element, completed=False)
for element in data
]