Source code for opencensus.trace.logging_exporter
# Copyright 2017, OpenCensus Authors
#
# 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
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# http://www.apache.org/licenses/LICENSE-2.0
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# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
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"""Export the spans data to python logging."""
import logging
from opencensus.common.transports import sync
from opencensus.trace import base_exporter
from opencensus.trace import span_data
[docs]class LoggingExporter(base_exporter.Exporter):
"""A exporter to export the spans data to python logging. Also can use
handlers like CloudLoggingHandler to log to Stackdriver Logging API.
:type handler: :class:`logging.handler`
:param handler: the handler to attach to the global handler
:type transport: :class:`type`
:param transport: Class for creating new transport objects. It should
extend from the base_exporter :class:`.Transport` type
and implement :meth:`.Transport.export`. Defaults to
:class:`.SyncTransport`. The other option is
:class:`.AsyncTransport`.
Example:
.. code-block:: python
import google.cloud.logging
from google.cloud.logging.handlers import CloudLoggingHandler
from opencensus.trace import logging_exporter
client = google.cloud.logging.Client()
cloud_handler = CloudLoggingHandler(client)
exporter = logging_exporter.LoggingExporter(handler=cloud_handler)
exporter.export(your_spans_list)
Or initialize a context tracer with the logging exporter, then the traces
will be exported to logging when finished.
"""
def __init__(self, handler=None, transport=sync.SyncTransport):
self.logger = logging.getLogger()
if handler is None:
handler = logging.StreamHandler()
self.handler = handler
self.logger.addHandler(handler)
self.logger.setLevel(logging.INFO)
self.transport = transport(self)
[docs] def emit(self, span_datas):
"""
:type span_datas: list of :class:
`~opencensus.trace.span_data.SpanData`
:param list of opencensus.trace.span_data.SpanData span_datas:
SpanData tuples to emit
"""
# convert to the legacy trace json for easier refactoring
# TODO: refactor this to use the span data directly
legacy_trace_json = span_data.format_legacy_trace_json(span_datas)
self.logger.info(legacy_trace_json)
[docs] def export(self, span_datas):
"""
:type span_datas: list of :class:
`~opencensus.trace.span_data.SpanData`
:param list of opencensus.trace.span_data.SpanData span_datas:
SpanData tuples to export
"""
self.transport.export(span_datas)