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#! /usr/bin/env python
import os
import uuid
from collections import Counter
from imc.auth import Auth
import imc.async
from imc.proxy import Proxy
class BlobServer:
def __init__(self, proxy, auth, idendesc, link,
location, blobtable, BlobHandle):
self._proxy = proxy
self._auth = auth
self._idendesc = idendesc
self._link = link
self._location = location
self._blobtable = blobtable
self.BlobHandle = BlobHandle
self._clients = set()
self._opencounts = Counter()
self._deltags = set()
self._containers = dict.fromkeys(self._blobtable.get_container_list(),
dict())
self._proxy.register_call('blobserver/', 'connect_client',
self.connect_client)
self._proxy.register_call('blobserver/', 'open_container',
self.open_container)
self._proxy.register_call('blobserver/', 'close_container',
self.close_container)
self._proxy.register_call('blobserver/', 'check_blob',
self.check_blob)
self._proxy.register_call('blobserver/', 'recv_commit',
self.recv_commit)
self.clean()
##################debug code##########################
print('blobserver: init')
self.show_status()
def show_status(self):
print('blobserver: containers =>\n', self._containers)
print('blobserver: blobs =>\n', self._blobtable.get_blob_list())
######################################################
def __del__(self):
self._proxy.unregister_call('blobserver/', 'connect_client')
self._proxy.unregister_call('blobserver/', 'open_container')
self._proxy.unregister_call('blobserver/', 'close_container')
self._proxy.unregister_call('blobserver/', 'check_blob')
self._proxy.unregister_call('blobserver/', 'recv_commit')
def _client_call(self, client, func, *args, timeout=10000):
client += 'blobclient/'
with Auth.change_current_iden(self._idendesc):
sta, ret = self._proxy.call(client, func, timeout, *args)
if not sta:
self.disconnect_client(client)
return (sta, ret)
def _client_call_async(self, client, func, callback,
*args, timeout=10000):
client += 'blobclient/'
with Auth.change_current_iden(self._idendesc):
self._proxy.call_async(client, func, timeout, callback, *args)
@imc.async.caller
def connect_client(self, client):
if client not in self._clients:
self._clients.add(client)
def disconnect_client(self, client):
try:
self._clients.remove(client)
except KeyError:
print("client", client, "doesn't exist")
def create_container(self, container):
if container not in self._containers:
self._blobtable.create_container(container)
self._containers[container] = dict()
def del_container(self, container):
try:
self._blobtable.del_container(container)
del self._containers[container]
except:
raise
@imc.async.caller
def open_container(self, client, container, method):
try:
self._containers[container][client] = method
except KeyError:
return False
else:
return True
@imc.async.caller
def close_container(self, client, container):
try:
self._containers[container].pop(client)
except KeyError:
return False
else:
return True
def clean(self):
del_list = list(self._deltags)
for rev in del_list:
self.del_real_blob(rev)
del_list = []
for blob, rev in (self._blobtable.get_blob_list().items()):
if not self.blob_exists(rev):
del_list.append(blob)
for container, name in del_list:
self.del_blob(container, name)
@imc.async.caller
def check_blob(self, client, container, name, cacherev, cachesha1):
info = self._blobtable.get_blob_info(container, name)
if info is None:
return ('no_exist', None)
elif cacherev != info['rev']:
if cachesha1 != info['sha1']:
result = self.send_blob(container, name, client)
return (result.filekey, info)
else:
return (None, info)
else:
return ('up_to_date', None)
def get_update_list(self, container):
clients = set()
for client, method in (self._containers[container].items()):
if method == "ACTIVE":
clients.add(client)
return clients
def send_update(self, client, container, name):
def recv_result(result):
nonlocal client
nonlocal container
nonlocal name
sta, ret = result
# TODO:
# limit retry
if not sta:
# self._client_call_async(client, 'get_update',
# recv_result, container, name)
self.disconnect_client(client)
self._containers[container].pop(client)
self._client_call_async(client, 'get_update',
recv_result, container, name)
@imc.async.caller
def recv_commit(self, client, commit_info, force_flag):
clientinfo = commit_info['info']
container = clientinfo['container']
name = clientinfo['name']
info = self._blobtable.get_blob_info(container, name)
if info is None:
if not commit_info['createtag']:
##################debug code##########################
print("blob doesn't exist, please add createtag")
##################debug code##########################
return False
elif info['rev'] != clientinfo['rev'] and not force_flag:
##################debug code##########################
print("revision conflict")
##################debug code##########################
return False
if commit_info['deltag']:
clientinfo['rev'] = None
self.del_blob(container, name)
return clientinfo
else:
clientinfo['rev'] = str(uuid.uuid4())
if not info or info['sha1'] != clientinfo['sha1']:
filekey = self.request_blob(client, commit_info['target'])
if (filekey == 'Efailtosend' or
filekey == 'Edisconnected'):
return False
else:
filekey = None
if filekey:
status = self.recv_blob(filekey, clientinfo['rev'])
result = status.wait()
else:
if info:
result = self.copy_blob(info['rev'], clientinfo['rev'])
else:
result = False
if result:
if clientinfo['rev']:
self.update_blob(clientinfo)
if info:
self.del_real_blob(info['rev'])
clients = self.get_update_list(container)
clients.discard(client)
for cli in clients:
self.send_update(cli, container, name)
return clientinfo
else:
return False
# @imc.async.caller
# def get_request(self, client, container, name):
# result = self.send_blob(client, container, name)
# if result:
# return result.filekey
# else:
# return None
def request_blob(self, client, target):
sta, ret = self._client_call(client, 'get_request', target)
if not sta:
return 'Edisconnected'
else:
return ret
def send_blob(self, container, name, client):
rev = self._blobtable.get_blob_info(container, name, 'rev')
if not rev:
return False
else:
def send_finish(result):
nonlocal rev
if self._opencounts[rev] > 0:
self._opencounts[rev] -= 1
blobpath = os.path.join(self._location, rev)
try:
ret = self._proxy.sendfile(client, blobpath)
except ConnectionError:
return False
else:
self._opencounts[rev] += 1
ret.wait_async(send_finish)
return ret
def recv_blob(self, filekey, filename):
blobpath = os.path.join(self._location, filename)
return self._proxy.recvfile(filekey, blobpath)
def update_blob(self, info):
self._blobtable.update_blob(info)
def del_blob(self, container, name):
rev = self._blobtable.get_blob_info(container, name, 'rev')
self._blobtable.del_blob(container, name)
if rev:
self.del_real_blob(rev)
def del_real_blob(self, rev):
self._deltags.add(rev)
if self._opencounts[rev] == 0:
self._deltags.remove(rev)
path = os.path.join(self._location, rev)
self.BlobHandle.del_blob(path)
def copy_blob(self, rev, newrev):
path = os.path.join(self._location, rev)
newpath = os.path.join(self._location, newrev)
return self.BlobHandle.copy_file(path, newpath)
def vertify_blob(self, rev, sha1):
blobpath = os.path.join(self._location, rev)
return self.BlobHandle._sha1(blobpath) == sha1
def blob_exists(self, rev):
return self.BlobHandle.file_exists(os.path.join(self._location, rev))
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