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# Copyright (C) 2012-2015 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, see <http://www.gnu.org/licenses/>.
import cliapp
import logging
import urllib
import urllib2
import urlparse
class HeadRequest(urllib2.Request): # pragma: no cover
def get_method(self):
return 'HEAD'
class GetError(cliapp.AppException):
def __init__(self, cache, artifact):
cliapp.AppException.__init__(
self, 'Failed to get the artifact %s '
'from the artifact cache %s' %
(artifact.basename(), cache))
class GetArtifactMetadataError(GetError):
def __init__(self, cache, artifact, name):
cliapp.AppException.__init__(
self, 'Failed to get metadata %s for the artifact %s '
'from the artifact cache %s' %
(name, artifact.basename(), cache))
class GetSourceMetadataError(GetError):
def __init__(self, cache, source, cache_key, name):
cliapp.AppException.__init__(
self, 'Failed to get metadata %s for source %s '
'and cache key %s from the artifact cache %s' %
(name, source, cache_key, cache))
class RemoteArtifactCache(object):
def __init__(self, server_url):
self.server_url = server_url
self.name = urlparse.urlparse(server_url).hostname
try:
self.method = self._get_method()
except urllib2.URLError:
self.method = 'tarball'
except Exception as e: # pragma: no cover
logging.debug('Failed to determine cache method: %s' % e)
raise cliapp.AppException('Failed to determine method used by '
'remote cache.')
if self.method == 'ostree': # pragma: no cover
self.ostree_url = 'http://%s:%s/' % (self.name,
self._get_ostree_info())
def has(self, artifact):
return self._has_file(artifact.basename())
def has_artifact_metadata(self, artifact, name):
return self._has_file(artifact.metadata_basename(name))
def has_source_metadata(self, source, cachekey, name):
filename = '%s.%s' % (cachekey, name)
return self._has_file(filename)
def get(self, artifact, log=logging.error):
try:
return self._get_file(artifact.basename())
except urllib2.URLError as e:
log(str(e))
raise GetError(self, artifact)
def get_artifact_metadata(self, artifact, name, log=logging.error):
try:
return self._get_file(artifact.metadata_basename(name))
except urllib2.URLError as e:
log(str(e))
raise GetArtifactMetadataError(self, artifact, name)
def get_source_metadata(self, source, cachekey, name):
filename = '%s.%s' % (cachekey, name)
try:
return self._get_file(filename)
except urllib2.URLError:
raise GetSourceMetadataError(self, source, cachekey, name)
def _has_file(self, filename): # pragma: no cover
url = self._request_url(filename)
logging.debug('RemoteArtifactCache._has_file: url=%s' % url)
request = HeadRequest(url)
try:
urllib2.urlopen(request)
return True
except (urllib2.HTTPError, urllib2.URLError):
return False
def _get_file(self, filename): # pragma: no cover
url = self._request_url(filename)
logging.debug('RemoteArtifactCache._get_file: url=%s' % url)
return urllib2.urlopen(url)
def _request_url(self, filename): # pragma: no cover
server_url = self.server_url
if not server_url.endswith('/'):
server_url += '/'
return urlparse.urljoin(
server_url, '/1.0/artifacts?filename=%s' %
urllib.quote(filename))
def _get_method(self): # pragma: no cover
logging.debug('Getting cache method of %s' % self.server_url)
request_url = urlparse.urljoin(self.server_url, '/1.0/method')
req = urllib2.urlopen(request_url)
return req.read()
def _get_ostree_info(self): # pragma: no cover
logging.debug('Getting OSTree repo info.')
request_url = urlparse.urljoin(self.server_url, '/1.0/ostreeinfo')
logging.debug('sending %s' % request_url)
req = urllib2.urlopen(request_url)
return req.read()
def __str__(self): # pragma: no cover
return self.server_url
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