def findfile(filename, sgroup, db=None):
"""
findfile(filename, sgroup, db=None) -> StorageGroup object
Will search through all matching storage groups, searching for file.
Returns matching storage group upon success.
"""
db = DBCache(db)
for sg in db.getStorageGroup(groupname=sgroup):
# search given group
if sg.local:
if os.access(sg.dirname + filename, os.F_OK):
return sg
for sg in db.getStorageGroup():
# not found, search all other groups
if sg.local:
if os.access(sg.dirname + filename, os.F_OK):
return sg
return None
def findfile(filename, sgroup, db=None):
"""
findfile(filename, sgroup, db=None) -> StorageGroup object
Will search through all matching storage groups, searching for file.
Returns matching storage group upon success.
"""
db = DBCache(db)
for sg in db.getStorageGroup(groupname=sgroup):
# search given group
if sg.local:
if os.access(sg.dirname+filename, os.F_OK):
return sg
for sg in db.getStorageGroup():
# not found, search all other groups
if sg.local:
if os.access(sg.dirname+filename, os.F_OK):
return sg
return None
def ftopen(file, mode, forceremote=False, nooverwrite=False, db=None, \
chanid=None, starttime=None, download=False):
"""
ftopen(file, mode, forceremote=False, nooverwrite=False, db=None)
-> FileTransfer object
-> file object
Method will attempt to open file locally, falling back to remote access
over mythprotocol if necessary.
'forceremote' will force a FileTransfer object if possible.
'file' takes a standard MythURI:
myth://<group>@<host>:<port>/<path>
'mode' takes a 'r' or 'w'
'nooverwrite' will refuse to open a file writable,
if a local file is found.
"""
db = DBCache(db)
log = MythLog('Python File Transfer', db=db)
reuri = re.compile(\
'myth://((?P<group>.*)@)?(?P<host>[\[\]a-zA-Z0-9_\-\.]*)(:[0-9]*)?/(?P<file>.*)')
reip = re.compile('(?:\d{1,3}\.){3}\d{1,3}')
if mode not in ('r', 'w'):
raise TypeError("File I/O must be of type 'r' or 'w'")
if chanid and starttime:
protoopen = lambda host, file, storagegroup: \
RecordFileTransfer(host, file, storagegroup,\
mode, chanid, starttime, db)
elif download:
protoopen = lambda host, lfile, storagegroup: \
DownloadFileTransfer(host, lfile, storagegroup, \
mode, file, db)
else:
protoopen = lambda host, file, storagegroup: \
FileTransfer(host, file, storagegroup, mode, db)
# process URI (myth://<group>@<host>[:<port>]/<path/to/file>)
match = reuri.match(file)
if match is None:
raise MythError('Invalid FileTransfer input string: ' + file)
host = match.group('host')
filename = match.group('file')
sgroup = match.group('group')
if sgroup is None:
sgroup = 'Default'
# get full system name
host = host.strip('[]')
if reip.match(host) or check_ipv6(host):
host = db._gethostfromaddr(host)
# user forced to remote access
if forceremote:
if (mode == 'w') and (filename.find('/') != -1):
raise MythFileError(MythError.FILE_FAILED_WRITE, file,
'attempting remote write outside base path')
if nooverwrite and FileOps(host, db=db).fileExists(filename, sgroup):
raise MythFileError(MythError.FILE_FAILED_WRITE, file,
'refusing to overwrite existing file')
return protoopen(host, filename, sgroup)
if mode == 'w':
# check for pre-existing file
path = FileOps(host, db=db).fileExists(filename, sgroup)
sgs = list(db.getStorageGroup(groupname=sgroup))
if path is not None:
if nooverwrite:
raise MythFileError(MythError.FILE_FAILED_WRITE, file,
'refusing to overwrite existing file')
for sg in sgs:
if sg.dirname in path:
if sg.local:
return open(sg.dirname + filename, mode)
else:
return protoopen(host, filename, sgroup)
# prefer local storage for new files
for i, v in reversed(list(enumerate(sgs))):
if not v.local:
sgs.pop(i)
else:
st = os.statvfs(v.dirname)
v.free = st[0] * st[3]
if len(sgs) > 0:
# choose path with most free space
sg = sorted(sgs, key=lambda sg: sg.free, reverse=True)[0]
# create folder if it does not exist
if filename.find('/') != -1:
path = sg.dirname + filename.rsplit('/', 1)[0]
if not os.access(path, os.F_OK):
os.makedirs(path)
log(log.FILE, log.INFO, 'Opening local file (w)',
sg.dirname + filename)
return open(sg.dirname + filename, mode)
# fallback to remote write
else:
if filename.find('/') != -1:
raise MythFileError(
MythError.FILE_FAILED_WRITE, file,
'attempting remote write outside base path')
return protoopen(host, filename, sgroup)
else:
# search for file in local directories
sg = findfile(filename, sgroup, db)
if sg is not None:
# file found, open local
log(log.FILE, log.INFO, 'Opening local file (r)',
sg.dirname + filename)
return open(sg.dirname + filename, mode)
else:
# file not found, open remote
return protoopen(host, filename, sgroup)
def ftopen(file, mode, forceremote=False, nooverwrite=False, db=None, \
chanid=None, starttime=None, download=False):
"""
ftopen(file, mode, forceremote=False, nooverwrite=False, db=None)
-> FileTransfer object
-> file object
Method will attempt to open file locally, falling back to remote access
over mythprotocol if necessary.
'forceremote' will force a FileTransfer object if possible.
'file' takes a standard MythURI:
myth://<group>@<host>:<port>/<path>
'mode' takes a 'r' or 'w'
'nooverwrite' will refuse to open a file writable,
if a local file is found.
"""
db = DBCache(db)
log = MythLog('Python File Transfer', db=db)
reuri = re.compile(\
'myth://((?P<group>.*)@)?(?P<host>[\[\]a-zA-Z0-9_\-\.]*)(:[0-9]*)?/(?P<file>.*)')
reip = re.compile('(?:\d{1,3}\.){3}\d{1,3}')
if mode not in ('r','w'):
raise TypeError("File I/O must be of type 'r' or 'w'")
if chanid and starttime:
protoopen = lambda host, file, storagegroup: \
RecordFileTransfer(host, file, storagegroup,\
mode, chanid, starttime, db)
elif download:
protoopen = lambda host, lfile, storagegroup: \
DownloadFileTransfer(host, lfile, storagegroup, \
mode, file, db)
else:
protoopen = lambda host, file, storagegroup: \
FileTransfer(host, file, storagegroup, mode, db)
# process URI (myth://<group>@<host>[:<port>]/<path/to/file>)
match = None
try:
match = reuri.match(file)
except:
pass
if match:
host = match.group('host')
filename = match.group('file')
sgroup = match.group('group')
if sgroup is None:
sgroup = 'Default'
elif len(file) == 3:
host, sgroup, filename = file
else:
raise MythError('Invalid FileTransfer input string: '+file)
# get full system name
host = host.strip('[]')
if reip.match(host) or check_ipv6(host):
host = db._gethostfromaddr(host)
# user forced to remote access
if forceremote:
if (mode == 'w') and (filename.find('/') != -1):
raise MythFileError(MythError.FILE_FAILED_WRITE, file,
'attempting remote write outside base path')
if nooverwrite and FileOps(host, db=db).fileExists(filename, sgroup):
raise MythFileError(MythError.FILE_FAILED_WRITE, file,
'refusing to overwrite existing file')
return protoopen(host, filename, sgroup)
if mode == 'w':
# check for pre-existing file
path = FileOps(host, db=db).fileExists(filename, sgroup)
sgs = list(db.getStorageGroup(groupname=sgroup))
if path is not None:
if nooverwrite:
raise MythFileError(MythError.FILE_FAILED_WRITE, file,
'refusing to overwrite existing file')
for sg in sgs:
if sg.dirname in path:
if sg.local:
return open(sg.dirname+filename, mode)
else:
return protoopen(host, filename, sgroup)
# prefer local storage for new files
for i,v in reversed(list(enumerate(sgs))):
if not v.local:
sgs.pop(i)
else:
st = os.statvfs(v.dirname)
v.free = st[0]*st[3]
if len(sgs) > 0:
# choose path with most free space
sg = sorted(sgs, key=lambda sg: sg.free, reverse=True)[0]
# create folder if it does not exist
if filename.find('/') != -1:
path = sg.dirname+filename.rsplit('/',1)[0]
if not os.access(path, os.F_OK):
os.makedirs(path)
log(log.FILE, log.INFO, 'Opening local file (w)',
sg.dirname+filename)
return open(sg.dirname+filename, mode)
# fallback to remote write
else:
if filename.find('/') != -1:
raise MythFileError(MythError.FILE_FAILED_WRITE, file,
'attempting remote write outside base path')
return protoopen(host, filename, sgroup)
else:
# search for file in local directories
sg = findfile(filename, sgroup, db)
if sg is not None:
# file found, open local
log(log.FILE, log.INFO, 'Opening local file (r)',
sg.dirname+filename)
return open(sg.dirname+filename, mode)
else:
# file not found, open remote
return protoopen(host, filename, sgroup)
