def init_app(self):
super(TaskProxy, self).init_app()
logging.setup("task dispatch proxy.")
LOG.info("task dispatch proxy run.")
self._init_zk()
self._build_listen()
self.app_service = AppService()
class TaskProxy(QApplication):
name = 'task proxy'
version = 'v2.0'
def init_app(self):
super(TaskProxy, self).init_app()
logging.setup("task dispatch proxy.")
LOG.info("task dispatch proxy run.")
self._init_zk()
self._build_listen()
self.app_service = AppService()
def run(self):
# part 1
self.run_status = False
@self.zk.ChildrenWatch(self.root)
def children_changes(children):
LOG.warn("....watch root(%s)'s childen changed: %r"
% (self.root, children))
master = min(children)
LOG.info("....current master is : %s" % master)
path = "%s/%s" % (self.root, master)
info = self.zk.get(path)
master_val = info[0]
LOG.info("....get master(%s) node value is : %s"
% (master, master_val))
native_ip = self._get_local_ip()
if master_val == native_ip:
LOG.info("....node(%s) is master, so runing."
% (master))
self.run_status = True
else:
LOG.warn("....node(%s) is not master, so wait."
% (native_ip))
self.run_status = False
# part 2
rlist = [self.fd] # wait until ready for reading
wlist = [] # wait until ready for writing
timeout = 10 # select timeout
cs_pool = {} # manage each client socket's data
cs_mapping = {} # mapping cs => (ip, port)
while True:
if not self.run_status:
time.sleep(1)
continue
rs, ws, es = select.select(rlist, wlist, rlist, timeout)
if not (rs or ws or es):
continue # no clients connect to server
# readable - current handle readable socket.
for s in rs:
if s is self.fd:
# current socket is listen socket, so accept.
cs, (rhost, rport) = s.accept()
LOG.info("....adding node(%s, %s) to the ring."
% (rhost, rport))
cs.setblocking(False)
rlist.append(cs)
cs_mapping[cs] = (rhost, rport)
cs_pool[cs] = Queue.Queue() # for the cs create data pool
else:
# current socket is client socket, so receive.
try:
peer_info = s.getpeername()
except:
self._handle_failed(s, rlist, wlist, cs_pool)
rhost, rport = cs_mapping.get(s)
if cs_mapping.get(s): del cs_mapping[s]
LOG.info("....removing node(%s, %s) from the ring."
% (rhost, rport))
continue
head_data = self._recvmsg(s, HEADER_BYTES)
if not head_data:
self._handle_failed(s, rlist, wlist, cs_pool)
rhost, rport = cs_mapping.get(s)
if cs_mapping.get(s): del cs_mapping[s]
LOG.info("....removing node(%s, %s) from the ring."
% (rhost, rport))
continue
head_msg = struct.unpack("!II", head_data)
command_id = head_msg[0]
if command_id == HEARTBEAT:
#print "recv heartbeat from node(%s)" % str(peer_info)
ack_msg = struct.pack("!II", ACK_HEART, 0)
cs_pool[s].put(ack_msg)
elif command_id == NORMALMSG:
#print "recv task info from node(%s)" % str(peer_info)
live_instancs = [
cs_mapping.get(cs) for cs, queue in cs_pool.items()
]
LOG.info("....ring have spider instances:( %s )."
% live_instancs)
task_sock_mapping = self._get_task_sock_mapping(
cs_pool
)
self._fill_task_data_to_cspool(
task_sock_mapping, cs_pool, s
)
# add the cs to writeable set for write response
if s not in ws:
ws.append(s)
# writeable - current handle writeable socket
for s in ws:
try:
s.getpeername()
except:
self._handle_failed(s, rlist, wlist, cs_pool)
rhost, rport = cs_mapping.get(s)
if cs_mapping.get(s): del cs_mapping[s]
LOG.info("....removing node(%s, %s) from the ring."
% (rhost, rport))
continue
try:
msg = cs_pool[s].get_nowait()
except Queue.Empty:
if s in wlist: wlist.remove(s)
continue
ret = self._sendmsg(s, msg)
if not ret:
self._handle_failed(s, rlist, wlist, cs_pool)
rhost, rport = cs_mapping.get(s)
if cs_mapping.get(s): del cs_mapping[s]
LOG.info("....removing node(%s, %s) from the ring."
% (rhost, rport))
continue
# exceptable - current handle exceptional socket
for s in es:
self._handle_failed(s, rlist, wlist, cs_pool)
rhost, rport = cs_mapping.get(s)
if cs_mapping.get(s): del cs_mapping[s]
LOG.info("....removing node(%s, %s) from the ring."
% (rhost, rport))
def _handle_failed(self, s, rlist, wlist, cs_pool):
self._close(s)
if s in rlist:
rlist.remove(s)
if s in wlist:
wlist.remove(s)
if s in cs_pool:
del cs_pool[s]
def _close(self, cs):
try:
cs.close()
except:
pass
def _get_task_data(self):
app_infos = self.app_service.fetch_apps()
for info in app_infos:
app_id = info.get("app_id")
app_name = info.get("app_name")
urls = self.app_service.fetch_urls(app_id)
computes = self.app_service.fetch_computes(app_id)
task_info = {}
task_info["group"] = app_name
task_info["urls"] = urls
task_info["computes"] = computes
yield task_info
def _get_task_sock_mapping(self, cs_pool):
""" 将现有任务与链接的client socket进行关联
"""
# 分配任务
task_list = list(self._get_task_data())
if not task_list:
LOG.warn("pull task list is failed......")
return
task_length = len(task_list)
worker_nums = len(cs_pool)
threshold = task_length / worker_nums
task_infos = [(lambda i: task_list[i*threshold:task_length]
if (i+1) == worker_nums
else task_list[i*threshold: (i+1)*threshold])(i)
for i in xrange(worker_nums)]
# 任务关联：
task_sock_mapping = {}
task_index = 0
for sock, ret in cs_pool.items():
task_sock_mapping[sock] = task_infos[task_index]
task_index += 1
return task_sock_mapping
def _fill_task_data_to_cspool(self, task_sock_mapping, cs_pool, cs):
""" 根据对应的client socket取出相应的数据
"""
task_data = task_sock_mapping.get(cs)
task_msg = json.dumps(task_data)
msglen = len(task_msg)
package_len = HEADER_BYTES + msglen
head_msg = struct.pack("!II", ACK_NORMAL, package_len)
body_fmt = "!%ds" % msglen
body_msg = struct.pack(body_fmt, task_msg)
ack_msg = head_msg + body_msg
cs_pool[cs].put(ack_msg)
def _build_listen(self):
proxy_host = self._get_local_ip()
proxy_port = CONF.PROXY.proxy_port
self.fd = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.fd.setblocking(False)
self.fd.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
self.fd.bind((proxy_host, proxy_port))
self.fd.listen(10)
LOG.info("listen socket running on (%s, %s)."
% (proxy_host, proxy_port))
def _get_local_ip(self):
host_name = socket.gethostname()
fqdn = socket.getfqdn(host_name)
ip = socket.gethostbyname(fqdn)
return ip
def _sendmsg(self, cs, msg):
def wrap(cs):
totalsent = 0
msglen = len(msg)
if 0 == msglen: return False
while totalsent < msglen:
sent = cs.send(msg[totalsent:])
if 0 == sent:
return False
totalsent += sent
return True
return self._retry(wrap, cs, 'send')
def _recvmsg(self, cs, msglen):
def wrap(cs):
chunks = []
bytes_recd = 0
while bytes_recd < msglen:
chunk = cs.recv(min(msglen - bytes_recd, 2048))
if '' == chunk:
return chunk
bytes_recd += len(chunk)
chunks.append(chunk)
return ''.join(chunks)
return self._retry(wrap, cs, 'recv')
def _retry(self, func, cs, flag):
"""No need to retry, because client is disconnect.
"""
result = None
try:
result = func(cs)
except Exception as _ex:
LOG.error("carray out (%s) is failed: %s" % (flag, str(_ex)))
return result
def _init_zk(self):
self.root = CONF.ZK.zk_root
try:
self.zk = KazooClient(hosts=CONF.ZK.zk_hosts)
self.zk.start(timeout=15)
except Exception as _ex:
LOG.error("connect to zk is timeout, err: %s" % str(_ex))
return
sub_node = '%s/dispatcher' % self.root
self.zk.create(sub_node,
self._get_local_ip(),
ephemeral=True,
sequence=True,
makepath=True
)