# Copyright (C) 2010 W. Trevor King <wking@drexel.edu>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
# For urllib2 information, see
# urllib2, from urllib2 - The Missing Manual
# http://www.voidspace.org.uk/python/articles/urllib2.shtml
#
# A dictionary of response codes is available in
# httplib.responses
"""
Access bug repository data over HTTP.
"""
import sys
import urllib
import urllib2
import urlparse
import libbe
import libbe.version
import base
from libbe import TESTING
if TESTING == True:
import doctest
import unittest
USER_AGENT = 'BE-HTTP-Storage'
HTTP_OK = 200
HTTP_FOUND = 302
HTTP_TEMP_REDIRECT = 307
HTTP_USER_ERROR = 418
HTTP_VALID = [HTTP_OK, HTTP_FOUND, HTTP_TEMP_REDIRECT, HTTP_USER_ERROR]
class InvalidURL (Exception):
def __init__(self, error=None, url=None, msg=None):
Exception.__init__(self, msg)
self.url = url
self.error = error
self.msg = msg
def __str__(self):
if self.msg == None:
if self.error == None:
return "Unknown URL error: %s" % self.url
return self.error.__str__()
return self.msg
def get_post_url(url, get=True, data_dict=None):
"""
get: use GET if True, otherwise use POST.
data_dict: dict of data to send.
"""
if data_dict == None:
data_dict = {}
if get == True:
if data_dict != {}:
# encode get parameters in the url
param_string = urllib.urlencode(data_dict)
url = "%s?%s" % (url, param_string)
data = None
else:
data = urllib.urlencode(data_dict)
headers = {'User-Agent':USER_AGENT}
req = urllib2.Request(url, data=data, headers=headers)
try:
response = urllib2.urlopen(req)
except urllib2.HTTPError, e:
if hasattr(e, 'reason'):
msg = 'We failed to reach a server.\nURL: %s\nReason: %s' \
% (url, e.reason)
elif hasattr(e, 'code'):
msg = "The server couldn't fulfill the request.\nURL: %s\nError code: %s" \
% (url, e.code)
raise InvalidURL(error=e, url=url, msg=msg)
page = response.read()
final_url = response.geturl()
info = response.info()
response.close()
return (page, final_url, info)
class HTTP (base.VersionedStorage):
"""
This class implements a Storage interface over HTTP, using GET to
retrieve information and POST to set information.
"""
name = 'HTTP'
def __init__(self, *args, **kwargs):
base.VersionedStorage.__init__(self, *args, **kwargs)
def storage_version(self, revision=None):
"""Return the storage format for this backend."""
return libbe.storage.STORAGE_VERSION
def _init(self):
"""Create a new storage repository."""
raise base.NotSupported(
'init', 'Cannot initialize this repository format.')
def _destroy(self):
"""Remove the storage repository."""
raise base.NotSupported(
'destroy', 'Cannot destroy this repository format.')
def _connect(self):
self.check_storage_version()
def _disconnect(self):
pass
def _add(self, id, parent=None, directory=False):
url = urlparse.urljoin(self.repo, 'add')
page,final_url,info = get_post_url(
url, get=False,
data_dict={'id':id, 'parent':parent, 'directory':directory})
def _remove(self, id):
url = urlparse.urljoin(self.repo, 'remove')
page,final_url,info = get_post_url(
url, get=False,
data_dict={'id':id, 'recursive':False})
def _recursive_remove(self, id):
url = urlparse.urljoin(self.repo, 'remove')
page,final_url,info = get_post_url(
url, get=False,
data_dict={'id':id, 'recursive':True})
def _children(self, id=None, revision=None):
url = urlparse.urljoin(self.repo, 'children')
page,final_url,info = get_post_url(
url, get=True,
data_dict={'id':id, 'revision':revision})
return page.strip('\n').splitlines()
def _get(self, id, default=base.InvalidObject, revision=None):
url = urlparse.urljoin(self.repo, '/'.join(['get', id]))
try:
page,final_url,info = get_post_url(
url, get=True,
data_dict={'revision':revision})
except InvalidURL, e:
if not (hasattr(e.error, 'code') and e.error.code in HTTP_VALID):
raise
elif default == base.InvalidObject:
raise base.InvalidID(id)
return default
version = info['X-BE-Version']
if version != libbe.storage.STORAGE_VERSION:
raise base.InvalidStorageVersion(
version, libbe.storage.STORAGE_VERSION)
return page
def _set(self, id, value):
url = urlparse.urljoin(self.repo, '/'.join(['set', id]))
try:
page,final_url,info = get_post_url(
url, get=False,
data_dict={'value':value})
except InvalidURL, e:
if not (hasattr(e.error, 'code') and e.error.code in HTTP_VALID):
raise
if e.error.code == HTTP_USER_ERROR:
raise base.InvalidDirectory(
'Directory %s cannot have data' % id)
raise base.InvalidID(id)
def _commit(self, summary, body=None, allow_empty=False):
url = urlparse.urljoin(self.repo, 'commit')
try:
page,final_url,info = get_post_url(
url, get=False,
data_dict={'summary':summary, 'body':body,
'allow_empty':allow_empty})
except InvalidURL, e:
if not (hasattr(e.error, 'code') and e.error.code in HTTP_VALID):
raise
if e.error.code == HTTP_USER_ERROR:
raise base.EmptyCommit
raise base.InvalidID(id)
return page.rstrip('\n')
def revision_id(self, index=None):
"""
Return the name of the <index>th revision. The choice of
which branch to follow when crossing branches/merges is not
defined. Revision indices start at 1; ID 0 is the blank
repository.
Return None if index==None.
If the specified revision does not exist, raise InvalidRevision.
"""
if index == None:
return None
try:
if int(index) != index:
raise InvalidRevision(index)
except ValueError:
raise InvalidRevision(index)
url = urlparse.urljoin(self.repo, 'revision-id')
try:
page,final_url,info = get_post_url(
url, get=True,
data_dict={'index':index})
except InvalidURL, e:
if not (hasattr(e.error, 'code') and e.error.code in HTTP_VALID):
raise
if e.error.code == HTTP_USER_ERROR:
raise base.InvalidRevision(index)
raise base.InvalidID(id)
return page.rstrip('\n')
def check_storage_version(self):
version = self.storage_version()
if version != libbe.storage.STORAGE_VERSION:
raise base.InvalidStorageVersion(
version, libbe.storage.STORAGE_VERSION)
def storage_version(self, revision=None):
url = urlparse.urljoin(self.repo, 'version')
page,final_url,info = get_post_url(
url, get=True, data_dict={'revision':revision})
return page.rstrip('\n')
if TESTING == True:
class GetPostUrlTestCase (unittest.TestCase):
"""Test cases for get_post_url()"""
def test_get(self):
url = 'http://bugseverywhere.org/be/show/HomePage'
page,final_url,info = get_post_url(url=url)
self.failUnless(final_url == url,
'Redirect?\n Expected: "%s"\n Got: "%s"'
% (url, final_url))
def test_get_redirect(self):
url = 'http://bugseverywhere.org'
expected = 'http://bugseverywhere.org/be/show/HomePage'
page,final_url,info = get_post_url(url=url)
self.failUnless(final_url == expected,
'Redirect?\n Expected: "%s"\n Got: "%s"'
% (expected, final_url))
#make_storage_testcase_subclasses(VersionedStorage, sys.modules[__name__])
unitsuite =unittest.TestLoader().loadTestsFromModule(sys.modules[__name__])
suite = unittest.TestSuite([unitsuite, doctest.DocTestSuite()])
