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# -*- coding: utf-8 -*-
"""
Tracking support similar to twitter finagle-thrift.
Note: When using tracking, every client should have a corresponding
server processor.
"""
from __future__ import absolute_import
import os.path
import time
from ...thrift import TClient, TApplicationException, TMessageType, \
TProcessor, TType
from ...parser import load
track_method = "__thriftpy_tracing_method_name__v2"
track_thrift = load(os.path.join(os.path.dirname(__file__), "tracking.thrift"))
__all__ = ["TTrackedClient", "TTrackedProcessor", "TrackerBase",
"ConsoleTracker"]
class RequestInfo(object):
def __init__(self, request_id, api, seq, client, server, status, start,
end, annotation, meta):
"""Used to store call info.
:request_id: used to identity a request
:api: api name
:seq: sequence number
:client: client name
:server: server name
:status: request status
:start: start timestamp
:end: end timestamp
:annotation: application-level key-value datas
"""
self.request_id = request_id
self.api = api
self.seq = seq
self.client = client
self.server = server
self.status = status
self.start = start
self.end = end
self.annotation = annotation
self.meta = meta
class TTrackedClient(TClient):
def __init__(self, tracker_handler, *args, **kwargs):
super(TTrackedClient, self).__init__(*args, **kwargs)
self.tracker = tracker_handler
self._upgraded = False
try:
self._negotiation()
self._upgraded = True
except TApplicationException as e:
if e.type != TApplicationException.UNKNOWN_METHOD:
raise
def _negotiation(self):
self._oprot.write_message_begin(track_method, TMessageType.CALL,
self._seqid)
args = track_thrift.UpgradeArgs()
self.tracker.init_handshake_info(args)
args.write(self._oprot)
self._oprot.write_message_end()
self._oprot.trans.flush()
api, msg_type, seqid = self._iprot.read_message_begin()
if msg_type == TMessageType.EXCEPTION:
x = TApplicationException()
x.read(self._iprot)
self._iprot.read_message_end()
raise x
else:
result = track_thrift.UpgradeReply()
result.read(self._iprot)
self._iprot.read_message_end()
def _send(self, _api, **kwargs):
if self._upgraded:
self._header = track_thrift.RequestHeader()
self.tracker.gen_header(self._header)
self._header.write(self._oprot)
self.send_start = int(time.time() * 1000)
super(TTrackedClient, self)._send(_api, **kwargs)
def _req(self, _api, *args, **kwargs):
if not self._upgraded:
return super(TTrackedClient, self)._req(_api, *args, **kwargs)
exception = None
status = False
try:
res = super(TTrackedClient, self)._req(_api, *args, **kwargs)
status = True
return res
except BaseException as e:
exception = e
raise
finally:
header_info = RequestInfo(
request_id=self._header.request_id,
seq=self._header.seq,
client=self.tracker.client,
server=self.tracker.server,
api=_api,
status=status,
start=self.send_start,
end=int(time.time() * 1000),
annotation=self.tracker.annotation,
meta=self._header.meta,
)
self.tracker.record(header_info, exception)
class TTrackedProcessor(TProcessor):
def __init__(self, tracker_handler, *args, **kwargs):
super(TTrackedProcessor, self).__init__(*args, **kwargs)
self.tracker = tracker_handler
self._upgraded = False
def process(self, iprot, oprot):
if not self._upgraded:
res = self._try_upgrade(iprot)
else:
request_header = track_thrift.RequestHeader()
request_header.read(iprot)
self.tracker.handle(request_header)
res = super(TTrackedProcessor, self).process_in(iprot)
self._do_process(iprot, oprot, *res)
def _try_upgrade(self, iprot):
api, msg_type, seqid = iprot.read_message_begin()
if msg_type == TMessageType.CALL and api == track_method:
self._upgraded = True
args = track_thrift.UpgradeArgs()
args.read(iprot)
self.tracker.handle_handshake_info(args)
result = track_thrift.UpgradeReply()
result.oneway = False
def call():
pass
iprot.read_message_end()
else:
result, call = self._process_in(api, iprot)
return api, seqid, result, call
def _process_in(self, api, iprot):
if api not in self._service.thrift_services:
iprot.skip(TType.STRUCT)
iprot.read_message_end()
return TApplicationException(
TApplicationException.UNKNOWN_METHOD), None
args = getattr(self._service, api + "_args")()
args.read(iprot)
iprot.read_message_end()
result = getattr(self._service, api + "_result")()
# convert kwargs to args
api_args = [args.thrift_spec[k][1]
for k in sorted(args.thrift_spec)]
def call():
return getattr(self._handler, api)(
*(args.__dict__[k] for k in api_args)
)
return result, call
def _do_process(self, iprot, oprot, api, seqid, result, call):
if isinstance(result, TApplicationException):
return self.send_exception(oprot, api, result, seqid)
try:
result.success = call()
except Exception as e:
# raise if api don't have throws
self.handle_exception(e, result)
if not result.oneway:
self.send_result(oprot, api, result, seqid)
from .tracker import TrackerBase, ConsoleTracker # noqa
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