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#! /usr/bin/env python
import os
from imc.auth import Auth
import imc.async
from imc.proxy import Proxy
from collections import Counter
class BlobClient:
def __init__(self, proxy, auth, idendesc, link, serverlink,
location, cachetable, BlobHandle):
self._proxy = proxy
self._auth = auth
self._idendesc = idendesc
self._link = link
self._server = serverlink
self._is_connected = False
self._location = location
self._cachetable = cachetable
self.BlobHandle = BlobHandle
self._opencounts = Counter()
self._containers = dict()
self._deltags = set()
self.connect_server()
self._proxy.register_call('blobclient/', 'get_update',
self.get_update)
def __del__(self):
self._proxy.unregister_call('blobclient/', 'get_update')
def _server_call(self, func, *args):
server = self._server + 'blobserver/'
with Auth.change_current_iden(self._idendesc):
for i in range(5):
sta, ret = self._proxy.call(server, func, 10000,
self._link, *args)
if sta or (not sta and ret == 'Enoexist'):
break
return (sta, ret)
def _client_call(self, otherclient, func, *args):
otherclient += 'blobclient/'
with TOJAuth.change_current_iden(self._idendesc):
for i in range(5):
sta, ret = self._proxy.call(otherclient, func, 10000,
self._link, *args)
if sta or (not sta and ret == 'Enoexist'):
break
return (sta, ret)
def connect_server(self, serverlink=None):
if serverlink:
self._server = serverlink
sta, ret = self._server_call('connect_client',
self._cachetable.get_blob_list())
if sta:
if ret:
self._is_connected = True
else:
pass
else:
pass
if self._is_connected:
# TODO:
pass
def open_container(self, container, method):
sta, ret = self._server_call('open_container', container, method)
if not sta:
# TODO:
# pend operation when client can't imc call server
return None
if ret:
self._containers[container] = method
return True
else:
return False
def close_container(self, container):
sta, ret = self._server_call('close_container', container)
if not sta:
# TODO:
# pend operation when client can't imc call server
return None
if ret:
del self._containers[container]
return True
else:
return False
# TODO:
# periodically call this function to clean old data and do something else
# ex: send pending operation
def sync(self):
for blobname_rev in self._deltags:
self.del_real_blob(blobname_rev)
# for container in self._containers:
# if self._containers[container] == 'ALWAYS':
# for blob in self._cachetable.get_blob_list(container):
# self.update(blob)
@imc.async.caller
def get_update(self, blobname, info, filekey=None):
if info is None:
self.del_blob(blobname)
elif filekey is not None:
rev = info['rev']
if self.recv_blob(filekey, blobname, rev).wait() == 'Success':
self.update_blob(blobname, info)
sta, ret = self._server_call('recv_update_result',
blobname, "Success", rev)
if not sta:
# TODO:
pass
else:
self.update_blob(blobname, info)
return self._link
def update(self, blobname):
cacherev = self._cachetable.get_blob_info(blobname, 'rev')
if cacherev == None:
cacherev = 0
sta, ret = self._server_call('check_blob', blobname, cacherev)
if not sta:
# TODO:
# pend operation when client can't imc call server
return None
if ret is None:
return True
elif not ret:
self._cachetable.del_blob(blobname)
if cacherev:
self.del_real_blob(''.join([blobname, '_', str(cacherev)]))
return None
else:
info = ret['info']
rev = info['rev']
for i in range(4):
rst = self.recv_blob(ret['filekey'], blobname, rev).wait()
sta, ret = self._server_call('recv_update_result', blobname,
rst, rev, True)
if not sta:
pass
# TODO:
if 'Success' == ret:
self.update_blob(blobname, info)
return True
return False
def commit(self, commit_info, force_flag, blobhandle):
filekey = None
if not commit_info['deltag'] and commit_info['written']:
result = self.send_blob(blobhandle._tmpfile)
filekey = result.filekey
sta, ret = self._server_call('recv_commit', commit_info,
force_flag, filekey)
if not sta:
# TODO:
# pend operation when client can't imc call server
return False
# TODO:
# if commit success , copy tmpfile to location
# TODO:
# opencounts ?
def send_blob(self, blobpath, otherclient=None):
if otherclient is None:
return self._proxy.sendfile(self._server, blobpath)
else:
return self._proxy.sendfile(otherclient, blobpath)
def recv_blob(self, filekey, blobname, rev):
blobpath = os.path.join(self._location, blobname + '_' + str(rev))
return self._proxy.recvfile(filekey, blobpath)
def update_blob(self, blobname, info):
rev = self._cachetable.get_blob_info(blobname, 'rev')
blobname_rev = ''.join([blobname, '_', str(rev)])
self.del_real_blob(blobname_rev)
self._cachetable.update_blob(blobname, info)
def del_blob(self, blobname):
rev = self._cachetable.get_blob_info(blobname, 'rev')
blobname_rev = ''.join([blobname, '_', str(rev)])
self._cachetable.del_blob(blobname)
self.del_real_blob(blobname_rev)
def del_real_blob(self, blobname_rev):
if self._opencounts[blobname_rev] == 0:
path = os.path.join(self._location, blobname_rev)
self.BlobHandle.del_blob(path)
else:
self._deltags.add(blobname_rev)
def open(self, container, blobname, flag):
if container not in self._containers:
raise Exception("this container isn't open")
blob = container + '_' + blobname
is_existent = self.update(blob)
if is_existent is None:
if (not flag & self.BlobHandle.WRITE or
not flag & self.BlobHandle.CREATE):
raise Exception("the blob doesn't exist, so you must "
"add a create flag")
elif not is_existent:
pass
try:
info = self._cachetable.get_blob_info(blob)
if info is None:
info = {'container': container,
'rev': 0,
'metadata': '',
'size': None,
'commit_time': None}
handle = self.BlobHandle(blob, info, flag, self)
except:
raise
else:
blob += '_' + str(handle.get_rev())
self._opencounts[blob] += 1
return handle
def close(self, blobhandle):
blob = ''.join([blobhandle._name, '_',
str(blobhandle.get_rev())])
self._opencounts[blob] -= 1
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