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# Copyright (c) 2016-2018 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.
from threadloop import ThreadLoop
import tornado
import tornado.httpclient
from tornado.concurrent import Future
from tornado.httputil import url_concat
from .TUDPTransport import TUDPTransport
from thrift.transport.TTransport import TBufferedTransport
class LocalAgentHTTP(object):
DEFAULT_TIMEOUT = 15
def __init__(self, host, port):
self.agent_http_host = host
self.agent_http_port = int(port)
def _request(self, path, timeout=DEFAULT_TIMEOUT, args=None):
http_client = tornado.httpclient.AsyncHTTPClient(
defaults=dict(request_timeout=timeout))
url = 'http://%s:%d/%s' % (self.agent_http_host, self.agent_http_port, path)
if args:
url = url_concat(url, args)
return http_client.fetch(url)
def request_sampling_strategy(self, service_name, timeout=DEFAULT_TIMEOUT):
return self._request('sampling', timeout=timeout, args={'service': service_name})
def request_throttling_credits(self,
service_name,
client_id,
operations,
timeout=DEFAULT_TIMEOUT):
return self._request('credits', timeout=timeout, args=[
('service', service_name),
('uuid', client_id),
] + [('operations', op) for op in operations])
class LocalAgentSender(TBufferedTransport):
"""
LocalAgentSender implements everything necessary to communicate with
local jaeger-agent. This class is designed to work in tornado and
non-tornado environments. If in torndado, pass in the ioloop, if not
then LocalAgentSender will create one for itself.
NOTE: LocalAgentSender derives from TBufferedTransport. This will buffer
up all written data until flush() is called. Flush gets called at the
end of the batch span submission call.
"""
def __init__(self, host, sampling_port, reporting_port, io_loop=None, throttling_port=None):
# IOLoop
self._thread_loop = None
self.io_loop = io_loop or self._create_new_thread_loop()
# HTTP sampling
self.local_agent_http = LocalAgentHTTP(host, sampling_port)
# HTTP throttling
if throttling_port:
self.throttling_http = LocalAgentHTTP(host, throttling_port)
# UDP reporting - this will only get written to after our flush() call.
# We are buffering things up because we are a TBufferedTransport.
udp = TUDPTransport(host, reporting_port)
TBufferedTransport.__init__(self, udp)
def _create_new_thread_loop(self):
"""
Create a daemonized thread that will run Tornado IOLoop.
:return: the IOLoop backed by the new thread.
"""
self._thread_loop = ThreadLoop()
if not self._thread_loop.is_ready():
self._thread_loop.start()
return self._thread_loop._io_loop
def readFrame(self):
"""Empty read frame that is never ready"""
return Future()
# Pass-through for HTTP sampling strategies request.
def request_sampling_strategy(self, *args, **kwargs):
return self.local_agent_http.request_sampling_strategy(*args, **kwargs)
# Pass-through for HTTP throttling credit request.
def request_throttling_credits(self, *args, **kwargs):
return self.throttling_http.request_throttling_credits(*args, **kwargs)
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