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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 json
import logging
from crossdock.thrift_gen.tracetest.ttypes import JoinTraceRequest, StartTraceRequest, \
Downstream, Transport, TraceResponse, ObservedSpan
#
# Serializers for the downstream calls
#
def set_downstream_object_values(downstream_object, json_obj):
return set_traced_service_object_values(downstream_object, json_obj, downstream_from_struct)
def join_trace_request_from_json(json_request):
if isinstance(json_request, (bytes, bytearray)):
json_request = json_request.decode('utf-8')
request = JoinTraceRequest()
set_downstream_object_values(request, json.loads(json_request))
return request
def start_trace_request_from_json(json_request):
if isinstance(json_request, (bytes, bytearray)):
json_request = json_request.decode('utf-8')
request = StartTraceRequest()
set_downstream_object_values(request, json.loads(json_request))
return request
def downstream_from_struct(json_obj):
downstream = Downstream()
set_downstream_object_values(downstream, json_obj)
return downstream
def join_trace_request_to_json(downstream, server_role):
req = {}
if downstream is not None:
req['downstream'] = traced_service_object_to_json(downstream)
if server_role is not None:
req['serverRole'] = str(server_role)
return json.dumps(req)
#
# Serializers for the upstream responses
#
def set_upstream_object_values(obj, json_obj):
return set_traced_service_object_values(obj, json_obj, traceresponse_from_struct)
def observed_span_from_struct(json_obj):
os = ObservedSpan()
set_upstream_object_values(os, json_obj)
return os
def traceresponse_from_struct(json_obj):
tr = TraceResponse()
set_upstream_object_values(tr, json_obj)
return tr
def traceresponse_from_json(json_str):
try:
if isinstance(json_str, (bytes, bytearray)):
json_str = json_str.decode('utf-8')
return traceresponse_from_struct(json.loads(json_str))
except: # noqa: E722
logging.exception('Failed to parse JSON')
raise
# Generic
def class_keys(obj):
return [a for a in dir(obj) if not a.startswith('__') and not
callable(getattr(obj, a)) and not
a == 'type_spec']
def traced_service_object_to_json(obj):
json_response = {}
for k in class_keys(obj):
if k == 'downstream':
if obj.downstream is not None:
json_response['downstream'] = traced_service_object_to_json(obj.downstream)
elif k == 'transport':
if obj.transport is not None:
json_response['transport'] = Transport._VALUES_TO_NAMES[obj.transport]
elif k == 'span':
if obj.span is not None:
json_response['span'] = traced_service_object_to_json(obj.span)
else:
json_response[k] = getattr(obj, k)
return json_response
def set_traced_service_object_values(obj, values, downstream_func):
for k in values.keys():
if hasattr(obj, k):
if k == 'downstream':
if values[k] is not None:
obj.downstream = downstream_func(values[k])
elif k == 'transport':
if values[k] is not None:
obj.transport = Transport._NAMES_TO_VALUES[values[k]]
elif k == 'span':
if values[k] is not None:
obj.span = observed_span_from_struct(values[k])
else:
setattr(obj, k, values[k])
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