def test_do_fstat_err(self):
try:
fs.do_fstat(1000)
except GlusterFileSystemOSError:
pass
else:
self.fail("Expected GlusterFileSystemOSError")
def test_do_fstat_err(self):
try:
fs.do_fstat(1000)
except GlusterFileSystemOSError:
pass
else:
self.fail("Expected GlusterFileSystemOSError")
def get_object_metadata(obj_path_or_fd):
"""
Return metadata of object.
"""
if isinstance(obj_path_or_fd, int):
# We are given a file descriptor, so this is an invocation from the
# DiskFile.open() method.
stats = do_fstat(obj_path_or_fd)
else:
# We are given a path to the object when the DiskDir.list_objects_iter
# method invokes us.
stats = do_stat(obj_path_or_fd)
if not stats:
metadata = {}
else:
is_dir = stat.S_ISDIR(stats.st_mode)
metadata = {
X_TYPE: OBJECT,
X_TIMESTAMP: normalize_timestamp(stats.st_ctime),
X_CONTENT_TYPE: DIR_TYPE if is_dir else FILE_TYPE,
X_OBJECT_TYPE: DIR_NON_OBJECT if is_dir else FILE,
X_CONTENT_LENGTH: 0 if is_dir else stats.st_size,
X_ETAG: md5().hexdigest() if is_dir else _get_etag(obj_path_or_fd)}
return metadata
def _adjust_metadata(fd, metadata):
# Fix up the metadata to ensure it has a proper value for the
# Content-Type metadata, as well as an X_TYPE and X_OBJECT_TYPE
# metadata values.
content_type = metadata.get(X_CONTENT_TYPE, '')
if not content_type:
# FIXME: How can this be that our caller supplied us with metadata
# that has a content type that evaluates to False?
#
# FIXME: If the file exists, we would already know it is a
# directory. So why are we assuming it is a file object?
metadata[X_CONTENT_TYPE] = FILE_TYPE
metadata[X_OBJECT_TYPE] = FILE
else:
if content_type.lower() == DIR_TYPE:
metadata[X_OBJECT_TYPE] = DIR_OBJECT
else:
metadata[X_OBJECT_TYPE] = FILE
# stat.st_mtime does not change after last write(). We set this to later
# detect if the object was changed from filesystem interface (non Swift)
statinfo = do_fstat(fd)
if stat.S_ISREG(statinfo.st_mode):
metadata[X_MTIME] = normalize_timestamp(statinfo.st_mtime)
metadata[X_TYPE] = OBJECT
return metadata
def _adjust_metadata(fd, metadata):
# Fix up the metadata to ensure it has a proper value for the
# Content-Type metadata, as well as an X_TYPE and X_OBJECT_TYPE
# metadata values.
content_type = metadata.get(X_CONTENT_TYPE, '')
if not content_type:
# FIXME: How can this be that our caller supplied us with metadata
# that has a content type that evaluates to False?
#
# FIXME: If the file exists, we would already know it is a
# directory. So why are we assuming it is a file object?
metadata[X_CONTENT_TYPE] = FILE_TYPE
metadata[X_OBJECT_TYPE] = FILE
else:
if content_type.lower() == DIR_TYPE:
metadata[X_OBJECT_TYPE] = DIR_OBJECT
else:
metadata[X_OBJECT_TYPE] = FILE
# stat.st_mtime does not change after last write(). We set this to later
# detect if the object was changed from filesystem interface (non Swift)
statinfo = do_fstat(fd)
if stat.S_ISREG(statinfo.st_mode):
metadata[X_MTIME] = normalize_timestamp(statinfo.st_mtime)
metadata[X_TYPE] = OBJECT
return metadata
def get_object_metadata(obj_path_or_fd, stats=None):
"""
Return metadata of object.
"""
if not stats:
if isinstance(obj_path_or_fd, int):
# We are given a file descriptor, so this is an invocation from the
# DiskFile.open() method.
stats = do_fstat(obj_path_or_fd)
else:
# We are given a path to the object when the
# DiskDir.list_objects_iter method invokes us.
stats = do_stat(obj_path_or_fd)
if not stats:
metadata = {}
else:
is_dir = stat.S_ISDIR(stats.st_mode)
metadata = {
X_TYPE: OBJECT,
X_TIMESTAMP: normalize_timestamp(stats.st_ctime),
X_CONTENT_TYPE: DIR_TYPE if is_dir else FILE_TYPE,
X_OBJECT_TYPE: DIR_NON_OBJECT if is_dir else FILE,
X_CONTENT_LENGTH: 0 if is_dir else stats.st_size,
X_MTIME: 0 if is_dir else normalize_timestamp(stats.st_mtime),
X_ETAG: md5().hexdigest() if is_dir else _get_etag(obj_path_or_fd)
}
return metadata
def test_do_fstat(self):
tmpdir = mkdtemp()
try:
fd, tmpfile = mkstemp(dir=tmpdir)
buf1 = os.stat(tmpfile)
buf2 = fs.do_fstat(fd)
assert buf1 == buf2
finally:
os.close(fd)
os.remove(tmpfile)
os.rmdir(tmpdir)
def test_do_fstat(self):
tmpdir = mkdtemp()
try:
fd, tmpfile = mkstemp(dir=tmpdir)
buf1 = os.stat(tmpfile)
buf2 = fs.do_fstat(fd)
assert buf1 == buf2
finally:
os.close(fd)
os.remove(tmpfile)
os.rmdir(tmpdir)
def open(self):
"""
Open the object.
This implementation opens the data file representing the object, reads
the associated metadata in the extended attributes, additionally
combining metadata from fast-POST `.meta` files.
.. note::
An implementation is allowed to raise any of the following
exceptions, but is only required to raise `DiskFileNotExist` when
the object representation does not exist.
:raises DiskFileNotExist: if the object does not exist
:raises DiskFileExpired: if the object has expired
:returns: itself for use as a context manager
"""
# Writes are always performed to a temporary file
try:
fd = do_open(self._data_file, os.O_RDONLY | O_CLOEXEC)
except SwiftOnFileSystemOSError as err:
if err.errno in (errno.ENOENT, errno.ENOTDIR):
# If the file does exist, or some part of the path does not
# exist, raise the expected DiskFileNotExist
raise DiskFileNotExist
raise
else:
stats = do_fstat(fd)
if not stats:
return
self._is_dir = stat.S_ISDIR(stats.st_mode)
obj_size = stats.st_size
self._metadata = read_metadata(fd)
if not validate_object(self._metadata):
create_object_metadata(fd)
self._metadata = read_metadata(fd)
assert self._metadata is not None
self._filter_metadata()
if self._is_dir:
do_close(fd)
obj_size = 0
self._fd = -1
else:
if self._is_object_expired(self._metadata):
raise DiskFileExpired(metadata=self._metadata)
self._fd = fd
self._obj_size = obj_size
return self
def open(self):
"""
Open the object.
This implementation opens the data file representing the object, reads
the associated metadata in the extended attributes, additionally
combining metadata from fast-POST `.meta` files.
.. note::
An implementation is allowed to raise any of the following
exceptions, but is only required to raise `DiskFileNotExist` when
the object representation does not exist.
:raises DiskFileNotExist: if the object does not exist
:raises DiskFileExpired: if the object has expired
:returns: itself for use as a context manager
"""
# Writes are always performed to a temporary file
try:
fd = do_open(self._data_file, os.O_RDONLY | O_CLOEXEC)
except GlusterFileSystemOSError as err:
if err.errno in (errno.ENOENT, errno.ENOTDIR):
# If the file does exist, or some part of the path does not
# exist, raise the expected DiskFileNotExist
raise DiskFileNotExist
raise
else:
stats = do_fstat(fd)
if not stats:
return
self._is_dir = stat.S_ISDIR(stats.st_mode)
obj_size = stats.st_size
self._metadata = read_metadata(fd)
if not validate_object(self._metadata):
create_object_metadata(fd)
self._metadata = read_metadata(fd)
assert self._metadata is not None
self._filter_metadata()
if self._is_dir:
do_close(fd)
obj_size = 0
self._fd = -1
else:
if self._is_object_expired(self._metadata):
raise DiskFileExpired(metadata=self._metadata)
self._fd = fd
self._obj_size = obj_size
return self
def _finalize_put(self, metadata):
# Write out metadata before fsync() to ensure it is also forced to
# disk.
write_metadata(self._fd, metadata)
# We call fsync() before calling drop_cache() to lower the
# amount of redundant work the drop cache code will perform on
# the pages (now that after fsync the pages will be all
# clean).
do_fsync(self._fd)
# From the Department of the Redundancy Department, make sure
# we call drop_cache() after fsync() to avoid redundant work
# (pages all clean).
do_fadvise64(self._fd, self._last_sync, self._upload_size)
# At this point we know that the object's full directory path
# exists, so we can just rename it directly without using Swift's
# swift.common.utils.renamer(), which makes the directory path and
# adds extra stat() calls.
df = self._disk_file
attempts = 1
while True:
try:
do_rename(self._tmppath, df._data_file)
except OSError as err:
if err.errno in (errno.ENOENT, errno.EIO) \
and attempts < MAX_RENAME_ATTEMPTS:
# FIXME: Why either of these two error conditions is
# happening is unknown at this point. This might be a
# FUSE issue of some sort or a possible race
# condition. So let's sleep on it, and double check
# the environment after a good nap.
_random_sleep()
# Tease out why this error occurred. The man page for
# rename reads:
# "The link named by tmppath does not exist; or, a
# directory component in data_file does not exist;
# or, tmppath or data_file is an empty string."
assert len(self._tmppath) > 0 and len(df._data_file) > 0
tpstats = do_stat(self._tmppath)
tfstats = do_fstat(self._fd)
assert tfstats
if not tpstats or tfstats.st_ino != tpstats.st_ino:
# Temporary file name conflict
raise DiskFileError(
'DiskFile.put(): temporary file, %s, was'
' already renamed (targeted for %s)' % (
self._tmppath, df._data_file))
else:
# Data file target name now has a bad path!
dfstats = do_stat(df._put_datadir)
if not dfstats:
raise DiskFileError(
'DiskFile.put(): path to object, %s, no'
' longer exists (targeted for %s)' % (
df._put_datadir, df._data_file))
else:
is_dir = stat.S_ISDIR(dfstats.st_mode)
if not is_dir:
raise DiskFileError(
'DiskFile.put(): path to object, %s,'
' no longer a directory (targeted for'
' %s)' % (self._put_datadir,
df._data_file))
else:
# Let's retry since everything looks okay
logging.warn(
"DiskFile.put(): rename('%s','%s')"
" initially failed (%s) but a"
" stat('%s') following that succeeded:"
" %r" % (
self._tmppath, df._data_file, str(err),
df._put_datadir, dfstats))
attempts += 1
continue
else:
raise SwiftOnFileSystemOSError(
err.errno, "%s, rename('%s', '%s')" % (
err.strerror, self._tmppath, df._data_file))
else:
# Success!
break
# Close here so the calling context does not have to perform this
# in a thread.
self.close()
def open(self):
"""
Open the object.
This implementation opens the data file representing the object, reads
the associated metadata in the extended attributes, additionally
combining metadata from fast-POST `.meta` files.
.. note::
An implementation is allowed to raise any of the following
exceptions, but is only required to raise `DiskFileNotExist` when
the object representation does not exist.
:raises DiskFileNotExist: if the object does not exist
:raises DiskFileExpired: if the object has expired
:returns: itself for use as a context manager
"""
# Writes are always performed to a temporary file
try:
self._fd = do_open(self._data_file, os.O_RDONLY | O_CLOEXEC)
except SwiftOnFileSystemOSError as err:
if err.errno in (errno.ENOENT, errno.ENOTDIR):
# If the file does exist, or some part of the path does not
# exist, raise the expected DiskFileNotExist
raise DiskFileNotExist
raise
try:
self._stat = do_fstat(self._fd)
self._is_dir = stat.S_ISDIR(self._stat.st_mode)
obj_size = self._stat.st_size
self._metadata = read_metadata(self._fd)
if not validate_object(self._metadata, self._stat):
create_object_metadata(self._fd)
self._metadata = read_metadata(self._fd)
assert self._metadata is not None
self._filter_metadata()
if self._is_dir:
do_close(self._fd)
obj_size = 0
self._fd = -1
else:
if self._is_object_expired(self._metadata):
raise DiskFileExpired(metadata=self._metadata)
self._obj_size = obj_size
except (OSError, IOError, DiskFileExpired) as err:
# Something went wrong. Context manager will not call
# __exit__. So we close the fd manually here.
self._close_fd()
if hasattr(err, 'errno') and err.errno == errno.ENOENT:
# Handle races: ENOENT can be raised by read_metadata()
# call in GlusterFS if file gets deleted by another
# client after do_open() succeeds
logging.warn("open(%s) succeeded but one of the subsequent "
"syscalls failed with ENOENT. Raising "
"DiskFileNotExist." % (self._data_file))
raise DiskFileNotExist
else:
# Re-raise the original exception after fd has been closed
raise
return self
def _finalize_put(self, metadata):
# Write out metadata before fsync() to ensure it is also forced to
# disk.
write_metadata(self._fd, metadata)
# We call fsync() before calling drop_cache() to lower the
# amount of redundant work the drop cache code will perform on
# the pages (now that after fsync the pages will be all
# clean).
do_fsync(self._fd)
# From the Department of the Redundancy Department, make sure
# we call drop_cache() after fsync() to avoid redundant work
# (pages all clean).
do_fadvise64(self._fd, self._last_sync, self._upload_size)
# At this point we know that the object's full directory path
# exists, so we can just rename it directly without using Swift's
# swift.common.utils.renamer(), which makes the directory path and
# adds extra stat() calls.
df = self._disk_file
attempts = 1
while True:
try:
do_rename(self._tmppath, df._data_file)
except OSError as err:
if err.errno in (errno.ENOENT, errno.EIO) \
and attempts < MAX_RENAME_ATTEMPTS:
# FIXME: Why either of these two error conditions is
# happening is unknown at this point. This might be a
# FUSE issue of some sort or a possible race
# condition. So let's sleep on it, and double check
# the environment after a good nap.
_random_sleep()
# Tease out why this error occurred. The man page for
# rename reads:
# "The link named by tmppath does not exist; or, a
# directory component in data_file does not exist;
# or, tmppath or data_file is an empty string."
assert len(self._tmppath) > 0 and len(df._data_file) > 0
tpstats = do_stat(self._tmppath)
tfstats = do_fstat(self._fd)
assert tfstats
if not tpstats or tfstats.st_ino != tpstats.st_ino:
# Temporary file name conflict
raise DiskFileError(
'DiskFile.put(): temporary file, %s, was'
' already renamed (targeted for %s)' %
(self._tmppath, df._data_file))
else:
# Data file target name now has a bad path!
dfstats = do_stat(df._put_datadir)
if not dfstats:
raise DiskFileError(
'DiskFile.put(): path to object, %s, no'
' longer exists (targeted for %s)' %
(df._put_datadir, df._data_file))
else:
is_dir = stat.S_ISDIR(dfstats.st_mode)
if not is_dir:
raise DiskFileError(
'DiskFile.put(): path to object, %s,'
' no longer a directory (targeted for'
' %s)' %
(self._put_datadir, df._data_file))
else:
# Let's retry since everything looks okay
logging.warn(
"DiskFile.put(): rename('%s','%s')"
" initially failed (%s) but a"
" stat('%s') following that succeeded:"
" %r" %
(self._tmppath, df._data_file, str(err),
df._put_datadir, dfstats))
attempts += 1
continue
else:
raise SwiftOnFileSystemOSError(
err.errno, "%s, rename('%s', '%s')" %
(err.strerror, self._tmppath, df._data_file))
else:
# Success!
break
# Close here so the calling context does not have to perform this
# in a thread.
self.close()
def open(self):
"""
Open the object.
This implementation opens the data file representing the object, reads
the associated metadata in the extended attributes, additionally
combining metadata from fast-POST `.meta` files.
.. note::
An implementation is allowed to raise any of the following
exceptions, but is only required to raise `DiskFileNotExist` when
the object representation does not exist.
:raises DiskFileNotExist: if the object does not exist
:raises DiskFileExpired: if the object has expired
:returns: itself for use as a context manager
"""
# Writes are always performed to a temporary file
try:
self._fd = do_open(self._data_file, os.O_RDONLY | O_CLOEXEC)
except SwiftOnFileSystemOSError as err:
if err.errno in (errno.ENOENT, errno.ENOTDIR):
# If the file does exist, or some part of the path does not
# exist, raise the expected DiskFileNotExist
raise DiskFileNotExist
raise
try:
self._stat = do_fstat(self._fd)
self._is_dir = stat.S_ISDIR(self._stat.st_mode)
obj_size = self._stat.st_size
self._metadata = read_metadata(self._fd)
if not validate_object(self._metadata, self._stat):
self._metadata = create_object_metadata(self._fd, self._stat,
self._metadata)
assert self._metadata is not None
self._filter_metadata()
if self._is_dir:
do_close(self._fd)
obj_size = 0
self._fd = -1
else:
if self._is_object_expired(self._metadata):
raise DiskFileExpired(metadata=self._metadata)
self._obj_size = obj_size
except (OSError, IOError, DiskFileExpired) as err:
# Something went wrong. Context manager will not call
# __exit__. So we close the fd manually here.
self._close_fd()
if hasattr(err, 'errno') and err.errno == errno.ENOENT:
# Handle races: ENOENT can be raised by read_metadata()
# call in GlusterFS if file gets deleted by another
# client after do_open() succeeds
logging.warn("open(%s) succeeded but one of the subsequent "
"syscalls failed with ENOENT. Raising "
"DiskFileNotExist." % (self._data_file))
raise DiskFileNotExist
else:
# Re-raise the original exception after fd has been closed
raise
return self
