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# Copyright (C) 2012-2014 Codethink Limited
#
# 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; version 2 of the License.
#
# 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.
import cliapp
import json
import logging
import urllib2
import urlparse
import urllib
class ResolveRefError(cliapp.AppException):
def __init__(self, repo_name, ref):
cliapp.AppException.__init__(
self, 'Failed to resolve ref %s for repo %s' %
(ref, repo_name))
class CatFileError(cliapp.AppException):
def __init__(self, repo_name, ref, filename):
cliapp.AppException.__init__(
self, 'Failed to cat file %s in ref %s of repo %s' %
(filename, ref, repo_name))
class LsTreeError(cliapp.AppException):
def __init__(self, repo_name, ref):
cliapp.AppException.__init__(
self, 'Failed to list tree in ref %s of repo %s' %
(ref, repo_name))
class RemoteRepoCache(object):
def __init__(self, server_url, resolver):
self.server_url = server_url
self._resolver = resolver
def resolve_ref(self, repo_name, ref):
repo_url = self._resolver.pull_url(repo_name)
try:
return self._resolve_ref_for_repo_url(repo_url, ref)
except urllib2.URLError, e:
logging.error('Caught exception: %s' % str(e))
raise ResolveRefError(repo_name, ref)
def resolve_ref_batch(self, references):
if len(references) == 0:
return
request = []
for repo_name, ref in references:
repo_url = self._resolver.pull_url(repo_name)
request.append(
dict(repo=repo_url, ref=ref))
result = self._make_request(
'sha1s', json_post_data=json.dumps(request))
return json.loads(result)
def cat_file(self, repo_name, ref, filename):
repo_url = self._resolver.pull_url(repo_name)
try:
return self._cat_file_for_repo_url(repo_url, ref, filename)
except BaseException, e:
logging.error('Caught exception: %s' % str(e))
raise CatFileError(repo_name, ref, filename)
def ls_tree(self, repo_name, ref):
repo_url = self._resolver.pull_url(repo_name)
try:
info = json.loads(self._ls_tree_for_repo_url(repo_url, ref))
return info['tree'].keys()
except BaseException, e:
logging.error('Caught exception: %s' % str(e))
raise LsTreeError(repo_name, ref)
def cat_file_multiple(self, triplets):
if len(triplets) == 0:
return
request = []
for repo_name, ref, filename in triplets:
repo_url = self._resolver.pull_url(repo_name)
request.append(
dict(repo=repo_url, ref=ref, filename=filename))
result = self._make_request(
'files', json_post_data=json.dumps(request))
return json.loads(result)
def _resolve_ref_for_repo_url(self, repo_url, ref): # pragma: no cover
data = self._make_request(
'sha1s?repo=%s&ref=%s' % self._quote_strings(repo_url, ref))
info = json.loads(data)
return info['sha1'], info['tree']
def _cat_file_for_repo_url(self, repo_url, ref,
filename): # pragma: no cover
return self._make_request(
'files?repo=%s&ref=%s&filename=%s'
% self._quote_strings(repo_url, ref, filename))
def _ls_tree_for_repo_url(self, repo_url, ref): # pragma: no cover
return self._make_request(
'trees?repo=%s&ref=%s' % self._quote_strings(repo_url, ref))
def _quote_strings(self, *args): # pragma: no cover
return tuple(urllib.quote(string) for string in args)
def _make_request(self, path, json_post_data=None): # pragma: no cover
server_url = self.server_url
if not server_url.endswith('/'):
server_url += '/'
url = urlparse.urljoin(server_url, '/1.0/%s' % path)
if json_post_data is None:
headers = {}
else:
headers = {'Content-type': 'application/json'}
request = urllib2.Request(url, data=json_post_data, headers=headers)
handle = urllib2.urlopen(request)
return handle.read()
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