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+# 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()])
generated by cgit (git 2.34.1) at 2024-11-14 00:16:10 +0000