Trace exporter for Datadog (#793)

Author: nbutton23

README.rst

@@ -226,12 +226,14 @@ Trace Exporter
 --------------
 
 -  `Azure`_
+-  `Datadog`_
 -  `Jaeger`_
 -  `OCAgent`_
 -  `Stackdriver`_
 -  `Zipkin`_
 
 .. _Azure: https://github.com/census-instrumentation/opencensus-python/tree/master/contrib/opencensus-ext-azure
+.. _Datadog: https://github.com/census-instrumentation/opencensus-python/tree/master/contrib/opencensus-ext-datadog
 .. _Django: https://github.com/census-instrumentation/opencensus-python/tree/master/contrib/opencensus-ext-django
 .. _Flask: https://github.com/census-instrumentation/opencensus-python/tree/master/contrib/opencensus-ext-flask
 .. _gevent: https://github.com/census-instrumentation/opencensus-python/tree/master/contrib/opencensus-ext-gevent

contrib/opencensus-ext-datadog/CHANGELOG.md

@@ -0,0 +1,4 @@
+# Changelog
+
+## Unreleased
+- Initial version.

contrib/opencensus-ext-datadog/examples/datadog.py

@@ -0,0 +1,23 @@
+from flask import Flask
+
+from opencensus.ext.flask.flask_middleware import FlaskMiddleware
+from opencensus.trace.samplers import AlwaysOnSampler
+from traces import DatadogTraceExporter
+from traces import Options
+
+app = Flask(__name__)
+middleware = FlaskMiddleware(app,
+                             blacklist_paths=['/healthz'],
+                             sampler=AlwaysOnSampler(),
+                             exporter=DatadogTraceExporter(
+                                 Options(service='python-export-test',
+                                         global_tags={"stack": "example"})))
+
+
+@app.route('/')
+def hello():
+    return 'Hello World!'
+
+
+if __name__ == '__main__':
+    app.run(host='0.0.0.0', port=8080, threaded=True)

contrib/opencensus-ext-datadog/opencensus/__init__.py

@@ -0,0 +1 @@
+__path__ = __import__('pkgutil').extend_path(__path__, __name__)

contrib/opencensus-ext-datadog/opencensus/ext/__init__.py

@@ -0,0 +1 @@
+__path__ = __import__('pkgutil').extend_path(__path__, __name__)

contrib/opencensus-ext-datadog/opencensus/ext/datadog/__init__.py

@@ -0,0 +1 @@
+__path__ = __import__('pkgutil').extend_path(__path__, __name__)