OT Collector trace exporter (#405)

Based on the OpenCensus agent exporter.

Fixes #343

Co-authored-by: Chris Kleinknecht <[email protected]>

tox.ini

@@ -2,7 +2,6 @@
 skipsdist = True
 skip_missing_interpreters = True
 envlist =
-
     ; Environments are organized by individual package, allowing
     ; for specifying supported Python versions per package.
     ; opentelemetry-api
@@ -44,7 +43,10 @@ envlist =
     ; opentelemetry-ext-mysql
     py3{4,5,6,7,8}-test-ext-mysql
     pypy3-test-ext-mysql
-
+    ; opentelemetry-ext-otcollector
+    py3{4,5,6,7,8}-test-ext-otcollector
+    ; ext-otcollector intentionally excluded from pypy3
+
     ; opentelemetry-ext-prometheus
     py3{4,5,6,7,8}-test-ext-prometheus
     pypy3-test-ext-prometheus
@@ -103,6 +105,7 @@ changedir =
   test-ext-jaeger: ext/opentelemetry-ext-jaeger/tests
   test-ext-dbapi: ext/opentelemetry-ext-dbapi/tests
   test-ext-mysql: ext/opentelemetry-ext-mysql/tests
+  test-ext-otcollector: ext/opentelemetry-ext-otcollector/tests
   test-ext-prometheus: ext/opentelemetry-ext-prometheus/tests
   test-ext-pymongo: ext/opentelemetry-ext-pymongo/tests
   test-ext-psycopg2: ext/opentelemetry-ext-psycopg2/tests
@@ -140,6 +143,8 @@ commands_pre =
   dbapi: pip install {toxinidir}/ext/opentelemetry-ext-dbapi
   mysql: pip install {toxinidir}/ext/opentelemetry-ext-dbapi
   mysql: pip install {toxinidir}/ext/opentelemetry-ext-mysql
+  otcollector: pip install {toxinidir}/opentelemetry-sdk
+  otcollector: pip install {toxinidir}/ext/opentelemetry-ext-otcollector
   prometheus: pip install {toxinidir}/opentelemetry-sdk
   prometheus: pip install {toxinidir}/ext/opentelemetry-ext-prometheus
   pymongo: pip install {toxinidir}/ext/opentelemetry-ext-pymongo
@@ -243,4 +248,4 @@ commands =
   pytest {posargs}
 
 commands_post =
-  docker-compose down
+  docker-compose down