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##############################################################################
#
# Copyright (c) 2010, 2011, 2012 ViFiB SARL and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
import ast
import json
import platform
import shutil
import traceback
try:
try:
from slapos.libnetworkcache import NetworkcacheClient, UploadError, \
DirectoryNotFound
except ImportError:
LIBNETWORKCACHE_ENABLED = False
else:
LIBNETWORKCACHE_ENABLED = True
except:
print 'There was problem while trying to import slapos.libnetworkcache:'\
'\n%s' % traceback.format_exc()
LIBNETWORKCACHE_ENABLED = False
print 'Networkcache forced to be disabled.'
def fallback_call(function):
"""Decorator which disallow to have any problem while calling method"""
def wrapper(self, *args, **kwd):
"""
Log the call, and the result of the call
"""
try:
return function(self, *args, **kwd)
except: # indeed, *any* exception is swallowed
print 'There was problem while calling method %r:\n%s' % (
function.__name__, traceback.format_exc())
return False
wrapper.__doc__ = function.__doc__
return wrapper
def debianize(os):
# keep only the major release number in case of debian
distname, version, id_ = os
if distname == 'debian' and '.' in version:
version = version.split('.')[0]
return distname, version, id_
def os_matches(os1, os2):
return debianize(os1) == debianize(os2)
@fallback_call
def download_network_cached(cache_url, dir_url, software_url, software_root,
key, path, logger, signature_certificate_list,
download_from_binary_cache_url_blacklist=None):
"""Downloads from a network cache provider
return True if download succeeded.
"""
if not LIBNETWORKCACHE_ENABLED:
return False
if not(cache_url and dir_url and software_url and software_root):
return False
for url in download_from_binary_cache_url_blacklist:
if software_url.startswith(url):
return False
# In order to call nc nicely.
if len(signature_certificate_list) == 0:
signature_certificate_list = None
try:
nc = NetworkcacheClient(cache_url, dir_url,
signature_certificate_list=signature_certificate_list)
except TypeError:
logger.warning('Incompatible version of networkcache, not using it.')
return False
logger.info('Downloading %s binary from network cache.' % software_url)
try:
file_descriptor = None
json_entry_list = nc.select_generic(key)
for entry in json_entry_list:
json_information, _ = entry
try:
tags = json.loads(json_information)
if tags.get('machine') != platform.machine():
continue
if not os_matches(ast.literal_eval(tags.get('os')),
platform.linux_distribution()):
continue
if tags.get('software_url') != software_url:
continue
if tags.get('software_root') != software_root:
continue
sha512 = tags.get('sha512')
file_descriptor = nc.download(sha512)
break
except Exception:
continue
if file_descriptor is not None:
f = open(path, 'w+b')
try:
shutil.copyfileobj(file_descriptor, f)
finally:
f.close()
file_descriptor.close()
return True
except (IOError, DirectoryNotFound), e:
logger.info('Failed to download from network cache %s: %s' % \
(software_url, str(e)))
return False
@fallback_call
def upload_network_cached(software_root, software_url, cached_key,
cache_url, dir_url, path, logger, signature_private_key_file,
shacache_cert_file, shacache_key_file, shadir_cert_file, shadir_key_file):
"""Upload file to a network cache server"""
if not LIBNETWORKCACHE_ENABLED:
return False
if not (software_root and software_url and cached_key \
and cache_url and dir_url):
return False
logger.info('Uploading %s binary into network cache.' % software_url)
# YXU: "file" and "urlmd5" should be removed when server side is ready
kw = dict(
file="file",
urlmd5="urlmd5",
software_url=software_url,
software_root=software_root,
machine=platform.machine(),
os=str(platform.linux_distribution())
)
f = open(path, 'r')
# convert '' into None in order to call nc nicely
if not signature_private_key_file:
signature_private_key_file = None
if not shacache_cert_file:
shacache_cert_file = None
if not shacache_key_file:
shacache_key_file = None
if not shadir_cert_file:
shadir_cert_file = None
if not shadir_key_file:
shadir_key_file = None
try:
nc = NetworkcacheClient(cache_url, dir_url,
signature_private_key_file=signature_private_key_file,
shacache_cert_file=shacache_cert_file,
shacache_key_file=shacache_key_file,
shadir_cert_file=shadir_cert_file,
shadir_key_file=shadir_key_file)
except TypeError:
logger.warning('Incompatible version of networkcache, not using it.')
return False
try:
return nc.upload_generic(f, cached_key, **kw)
except (IOError, UploadError), e:
logger.info('Fail to upload file. %s' % (str(e)))
return False
finally:
f.close()
return True