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Diffstat (limited to 'ufo/gluster/swift/common/utils.py')
| -rw-r--r-- | ufo/gluster/swift/common/utils.py | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/ufo/gluster/swift/common/utils.py b/ufo/gluster/swift/common/utils.py index 56376f8eed5..d35abe5825b 100644 --- a/ufo/gluster/swift/common/utils.py +++ b/ufo/gluster/swift/common/utils.py @@ -17,6 +17,7 @@ import logging import os import errno import xattr +import random from hashlib import md5 import cPickle as pickle from ConfigParser import ConfigParser, NoSectionError, NoOptionError @@ -455,3 +456,33 @@ def create_container_metadata(cont_path, memcache=None): def create_account_metadata(acc_path, memcache=None): metadata = get_account_metadata(acc_path, memcache) return restore_metadata(acc_path, metadata) + +def write_pickle(obj, dest, tmp=None, pickle_protocol=0): + """ + Ensure that a pickle file gets written to disk. The file is first written + to a tmp file location in the destination directory path, ensured it is + synced to disk, then moved to its final destination name. + + This version takes advantage of Gluster's dot-prefix-dot-suffix naming + where the a file named ".thefile.name.9a7aasv" is hashed to the same + Gluster node as "thefile.name". This ensures the renaming of a temp file + once written does not move it to another Gluster node. + + :param obj: python object to be pickled + :param dest: path of final destination file + :param tmp: path to tmp to use, defaults to None (ignored) + :param pickle_protocol: protocol to pickle the obj with, defaults to 0 + """ + dirname = os.path.dirname(dest) + basename = os.path.basename(dest) + tmpname = '.' + basename + '.' + md5(basename + str(random.random())).hexdigest() + tmppath = os.path.join(dirname, tmpname) + with open(tmppath, 'wb') as fo: + pickle.dump(obj, fo, pickle_protocol) + fo.flush() + os.fsync(fo) + os.rename(tmppath, dest) + +# Over-ride Swift's utils.write_pickle with ours +import swift.common.utils +swift.common.utils.write_pickle = write_pickle |