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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.
import tornado.web
import logging
import json
import os
from jaeger_client.local_agent_net import LocalAgentSender
from jaeger_client.config import (
Config,
DEFAULT_SAMPLING_PORT,
DEFAULT_REPORTING_PORT,
)
from jaeger_client.constants import (
SAMPLER_TYPE_CONST,
SAMPLER_TYPE_REMOTE,
)
from jaeger_client.sampler import RemoteControlledSampler, ConstSampler
from jaeger_client.reporter import Reporter
from jaeger_client.throttler import RemoteThrottler
from jaeger_client.tracer import Tracer
config = {
'service_name': 'crossdock-python',
'enabled': True,
'sampler': {
'type': 'probabilistic',
'param': 1,
},
'reporter_flush_interval': 1,
'sampling_refresh_interval': 5,
}
class EndToEndHandler(object):
"""
Handler that creates traces from a http request.
json: {
"type": "remote"
"operation": "operationName",
"count": 2,
"tags": {
"key": "value"
}
}
Given the above json payload, the handler will use a tracer with the RemoteControlledSampler
to create 2 traces for the "operationName" operation with the tags: {"key":"value"}. These
traces are reported to the agent with the hostname "test_driver".
"""
def __init__(self):
cfg = Config(config)
init_sampler = cfg.sampler
channel = self.local_agent_sender
reporter = Reporter(channel=channel,
flush_interval=cfg.reporter_flush_interval)
remote_sampler = RemoteControlledSampler(
channel=channel,
service_name=cfg.service_name,
sampling_refresh_interval=cfg.sampling_refresh_interval,
init_sampler=init_sampler)
throttler = RemoteThrottler(channel, cfg.service_name)
remote_tracer = Tracer(
service_name=cfg.service_name,
reporter=reporter,
sampler=remote_sampler,
throttler=throttler)
const_tracer = Tracer(
service_name=cfg.service_name,
reporter=reporter,
sampler=ConstSampler(decision=True),
throttler=throttler
)
self._tracers = {
SAMPLER_TYPE_CONST: const_tracer,
SAMPLER_TYPE_REMOTE: remote_tracer
}
@property
def tracers(self):
return self._tracers
@tracers.setter
def tracers(self, tracers):
self._tracers = tracers
@property
def local_agent_sender(self):
host, port = _determine_host_port()
return LocalAgentSender(
host=host,
sampling_port=DEFAULT_SAMPLING_PORT,
reporting_port=port,
throttling_port=DEFAULT_SAMPLING_PORT,
)
@tornado.gen.coroutine
def generate_traces(self, request, response_writer):
if isinstance(request.body, (bytes, bytearray)):
request.body = request.body.decode('utf-8')
req = json.loads(request.body)
sampler_type = req.get('type', 'remote')
tracer = self.tracers[sampler_type]
for _ in range(req.get('count', 0)):
span = tracer.start_span(req['operation'])
for k, v in req.get('tags', {}).items():
span.set_tag(k, v)
span.finish()
response_writer.finish()
def _determine_host_port():
host_port = os.environ.get('AGENT_HOST_PORT', None)
if host_port:
host, port = _parse_host_port(host_port,
'jaeger-agent',
DEFAULT_REPORTING_PORT)
else:
host, port = 'jaeger-agent', DEFAULT_REPORTING_PORT
return host, port
def _parse_host_port(host_port, default_host, default_port):
try:
host, port_str = host_port.split(':')
port = int(port_str)
return host, port
except ValueError:
logging.getLogger().error(
'Invalid host port (%s), using default host port (%s:%d)',
host_port, default_host, default_port)
return default_host, default_port
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