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# Copyright (c) 2016 Uber Technologies, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import logging
import tornado.web
import opentracing
from opentracing.scope_managers.tornado import TornadoScopeManager
import tornado.ioloop
import tornado.httpclient
from tornado.web import asynchronous
from jaeger_client import Tracer, ConstSampler
from jaeger_client.reporter import NullReporter
import crossdock.server.constants as constants
import crossdock.server.serializer as serializer
from crossdock.server.endtoend import EndToEndHandler
from opentracing_instrumentation import http_client, http_server, get_current_span, request_context
from opentracing_instrumentation.client_hooks import tornado_http
import opentracing.ext.tags as ext_tags
from crossdock.thrift_gen.tracetest.ttypes import ObservedSpan, TraceResponse, Transport, \
JoinTraceRequest
from tchannel import TChannel, thrift
from crossdock.server.thriftrw_serializer import trace_response_to_thriftrw, \
join_trace_request_to_thriftrw
DefaultClientPortHTTP = 8080
DefaultServerPortHTTP = 8081
DefaultServerPortTChannel = 8082
tracer = Tracer(
service_name='python',
reporter=NullReporter(),
sampler=ConstSampler(decision=True),
scope_manager=TornadoScopeManager())
opentracing.set_global_tracer(tracer)
idl_path = 'idl/thrift/crossdock/tracetest.thrift'
thrift_services = {}
def get_thrift_service(service_name):
if service_name in thrift_services:
return thrift_services[service_name]
thrift_service = thrift.load(path=idl_path, service=service_name)
thrift_services[service_name] = thrift_service
return thrift_service
def serve():
"""main entry point"""
logging.getLogger().setLevel(logging.DEBUG)
logging.info('Python Tornado Crossdock Server Running ...')
server = Server(DefaultServerPortTChannel)
endtoend_handler = EndToEndHandler()
app = make_app(server, endtoend_handler)
app.listen(DefaultClientPortHTTP)
app.listen(DefaultServerPortHTTP)
server.tchannel.listen()
tornado.ioloop.IOLoop.current().start()
# Tornado Stuff
class MainHandler(tornado.web.RequestHandler):
def initialize(self, server=None, method=None):
self.server = server
self.method = method
@asynchronous
def get(self):
if self.server and self.method:
self.method(self.server, self.request, self)
else:
self.finish()
@asynchronous
def post(self):
if self.server and self.method:
self.method(self.server, self.request, self)
else:
self.finish()
def head(self):
pass
def make_app(server, endtoend_handler):
return tornado.web.Application(
[
(r'/', MainHandler),
(r'/start_trace', MainHandler, (dict(server=server, method=Server.start_trace))),
(r'/join_trace', MainHandler, (dict(server=server, method=Server.join_trace))),
(r'/create_traces', MainHandler, (dict(server=endtoend_handler,
method=EndToEndHandler.generate_traces))),
], debug=True, autoreload=False)
# HTTP Tracing Stuff
class UnknownTransportException(Exception):
pass
def get_observed_span(span):
return ObservedSpan(
traceId='%x' % span.trace_id,
sampled=span.is_sampled(),
baggage=span.get_baggage_item(constants.baggage_key)
)
class Server(object):
def __init__(self, port):
self.tracer = opentracing.global_tracer()
self.tchannel = self.make_tchannel(port)
def make_tchannel(self, port):
tchannel = TChannel('python', hostport='localhost:%d' % port, trace=True)
service = get_thrift_service(service_name='python')
@tchannel.thrift.register(service.TracedService, method='joinTrace')
@tornado.gen.coroutine
def join_trace(request):
join_trace_request = request.body.request or None
logging.info('TChannel join_trace request: %s', join_trace_request)
response = yield self.prepare_response(get_current_span(),
join_trace_request.downstream)
logging.info('TChannel join_trace response: %s', response)
raise tornado.gen.Return(trace_response_to_thriftrw(service, response))
return tchannel
@tornado.gen.coroutine
def start_trace(self, request, response_writer):
start_trace_req = serializer.start_trace_request_from_json(request.body)
logging.info('HTTP start_trace request: %s', start_trace_req)
def update_span(span):
span.set_baggage_item(constants.baggage_key, start_trace_req.baggage)
span.set_tag(ext_tags.SAMPLING_PRIORITY, start_trace_req.sampled)
response = yield self.prepare_response(self.get_span(request, update_span),
start_trace_req.downstream)
logging.info('HTTP start_trace response: %s', response)
response_writer.write(serializer.traced_service_object_to_json(response))
response_writer.finish()
@tornado.gen.coroutine
def join_trace(self, request, response_writer):
join_trace_request = serializer.join_trace_request_from_json(request.body)
logging.info('HTTP join_trace request: %s', join_trace_request)
response = yield self.prepare_response(self.get_span(request, None),
join_trace_request.downstream)
logging.info('HTTP join_trace response: %s', response)
response_writer.write(serializer.traced_service_object_to_json(response))
response_writer.finish()
def get_span(self, http_request, update_span_func):
span = http_server.before_request(http_server.TornadoRequestWrapper(request=http_request),
self.tracer)
if update_span_func:
update_span_func(span)
return span
@tornado.gen.coroutine
def prepare_response(self, span, downstream):
observed_span = get_observed_span(span)
trace_response = TraceResponse(span=observed_span, notImplementedError='')
if downstream:
with request_context.span_in_stack_context(span):
future = self.call_downstream(span, downstream)
downstream_trace_resp = yield future
trace_response.downstream = downstream_trace_resp
raise tornado.gen.Return(trace_response)
@tornado.gen.coroutine
def call_downstream(self, span, downstream):
if downstream.transport == Transport.HTTP:
downstream_trace_resp = yield self.call_downstream_http(span, downstream)
elif downstream.transport == Transport.TCHANNEL:
downstream_trace_resp = yield self.call_downstream_tchannel(downstream)
else:
raise UnknownTransportException('%s' % downstream.transport)
raise tornado.gen.Return(downstream_trace_resp)
@tornado.gen.coroutine
def call_downstream_http(self, span, downstream):
url = 'http://%s:%s/join_trace' % (downstream.host, downstream.port)
body = serializer.join_trace_request_to_json(downstream.downstream, downstream.serverRole)
req = tornado.httpclient.HTTPRequest(url=url, method='POST',
headers={'Content-Type': 'application/json'},
body=body)
http_client.before_http_request(tornado_http.TornadoRequestWrapper(request=req),
lambda: span)
client = tornado.httpclient.AsyncHTTPClient()
http_result = yield client.fetch(req)
raise tornado.gen.Return(serializer.traceresponse_from_json(http_result.body))
@tornado.gen.coroutine
def call_downstream_tchannel(self, downstream):
downstream_service = get_thrift_service(downstream.serviceName)
jtr = JoinTraceRequest(downstream.serverRole, downstream.downstream)
jtr = join_trace_request_to_thriftrw(downstream_service, jtr)
hostport = '%s:%s' % (downstream.host, downstream.port)
thrift_result = yield self.tchannel.thrift(downstream_service.TracedService.joinTrace(jtr),
hostport=hostport)
raise tornado.gen.Return(thrift_result.body)
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