103 lines
3.5 KiB
Python
103 lines
3.5 KiB
Python
import os
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from moto.xray import xray_backends
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import aws_xray_sdk.core
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from aws_xray_sdk.core.context import Context as AWSContext
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from aws_xray_sdk.core.emitters.udp_emitter import UDPEmitter
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class MockEmitter(UDPEmitter):
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"""
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Replaces the code that sends UDP to local X-Ray daemon
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"""
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def __init__(self, daemon_address="127.0.0.1:2000"):
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address = os.getenv(
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"AWS_XRAY_DAEMON_ADDRESS_YEAH_NOT_TODAY_MATE", daemon_address
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)
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self._ip, self._port = self._parse_address(address)
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def _xray_backend(self, region):
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return xray_backends[region]
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def send_entity(self, entity):
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# Hack to get region
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# region = entity.subsegments[0].aws['region']
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# xray = self._xray_backend(region)
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# TODO store X-Ray data, pretty sure X-Ray needs refactor for this
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pass
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def _send_data(self, data):
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raise RuntimeError("Should not be running this")
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class MockXrayClient:
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"""
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Mocks the X-Ray sdk by pwning its evil singleton with our methods
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The X-Ray SDK has normally been imported and `patched()` called long before we start mocking.
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This means the Context() will be very unhappy if an env var isnt present, so we set that, save
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the old context, then supply our new context.
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We also patch the Emitter by subclassing the UDPEmitter class replacing its methods and pushing
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that itno the recorder instance.
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"""
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def __call__(self, f=None):
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if not f:
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return self
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def wrapped_f(*args, **kwargs):
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self.start()
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try:
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f(*args, **kwargs)
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finally:
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self.stop()
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return wrapped_f
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def start(self):
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print("Starting X-Ray Patch")
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self.old_xray_context_var = os.environ.get("AWS_XRAY_CONTEXT_MISSING")
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os.environ["AWS_XRAY_CONTEXT_MISSING"] = "LOG_ERROR"
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self.old_xray_context = aws_xray_sdk.core.xray_recorder._context
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self.old_xray_emitter = aws_xray_sdk.core.xray_recorder._emitter
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aws_xray_sdk.core.xray_recorder._context = AWSContext()
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aws_xray_sdk.core.xray_recorder._emitter = MockEmitter()
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def stop(self):
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if self.old_xray_context_var is None:
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del os.environ["AWS_XRAY_CONTEXT_MISSING"]
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else:
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os.environ["AWS_XRAY_CONTEXT_MISSING"] = self.old_xray_context_var
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aws_xray_sdk.core.xray_recorder._emitter = self.old_xray_emitter
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aws_xray_sdk.core.xray_recorder._context = self.old_xray_context
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def __enter__(self):
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self.start()
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return self
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def __exit__(self, *args):
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self.stop()
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class XRaySegment(object):
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"""
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XRay is request oriented, when a request comes in, normally middleware like django (or automatically in lambda) will mark
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the start of a segment, this stay open during the lifetime of the request. During that time subsegments may be generated
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by calling other SDK aware services or using some boto functions. Once the request is finished, middleware will also stop
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the segment, thus causing it to be emitted via UDP.
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During testing we're going to have to control the start and end of a segment via context managers.
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"""
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def __enter__(self):
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aws_xray_sdk.core.xray_recorder.begin_segment(
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name="moto_mock", traceid=None, parent_id=None, sampling=1
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)
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return self
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def __exit__(self, exc_type, exc_val, exc_tb):
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aws_xray_sdk.core.xray_recorder.end_segment()
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