Add travis CI along with some bug fixes (#56)

* Add travis CI

* fix a broken test on travis server

* Fix pynamodb tests

* add dummpy tox env vars

* Fixed a pynamodb patcher encoding bug under python3.4 and 3.5

Author: haotianw465

.travis.yml

@@ -0,0 +1,13 @@
+language: python
+
+python:
+  - "2.7"
+  - "3.4"
+  - "3.5"
+  - "3.6"
+
+install:
+  - pip install tox
+
+script:
+  - tox -e $(echo py$TRAVIS_PYTHON_VERSION | tr -d .)

README.md

@@ -1,3 +1,5 @@
+[![Build Status](https://travis-ci.org/aws/aws-xray-sdk-python.svg?branch=master)](https://travis-ci.org/aws/aws-xray-sdk-python)
+
 # AWS X-Ray SDK for Python
 
 ![Screenshot of the AWS X-Ray console](/images/example_servicemap.png?raw=true)

aws_xray_sdk/core/recorder.py

@@ -393,8 +393,7 @@ def record_subsegment(self, wrapped, instance, args, kwargs, name,
                         stack=stack,
                     )
                 elif exception:
-                    if subsegment:
-                        subsegment.add_exception(exception, stack)
+                    subsegment.add_exception(exception, stack)
 
                 self.end_subsegment(end_time)
 

aws_xray_sdk/ext/pynamodb/patch.py

@@ -56,8 +56,8 @@ def pynamodb_meta_processor(wrapped, instance, args, kwargs, return_value,
 
     subsegment.put_http_meta(http.STATUS, return_value.status_code)
 
-    _extract_whitelisted_params(subsegment.name, operation_name,
-                                aws_meta, [None, json.loads(args[0].body)],
+    _extract_whitelisted_params(subsegment.name, operation_name, aws_meta,
+                                [None, json.loads(args[0].body.decode('utf-8'))],
                                 None, return_value.json())
 
     subsegment.set_aws(aws_meta)

tests/ext/pynamodb/test_pynamodb.py

@@ -1,5 +1,8 @@
-import botocore.session
 import pytest
+
+import botocore.session
+from botocore import UNSIGNED
+from botocore.client import Config
 from botocore.exceptions import ClientError
 from pynamodb.attributes import UnicodeAttribute
 from pynamodb.models import Model
@@ -61,7 +64,8 @@ def test_only_dynamodb_calls_are_traced():
     PynamoDB call.
     """
     session = botocore.session.get_session()
-    s3 = session.create_client('s3', region_name='us-west-2')
+    s3 = session.create_client('s3', region_name='us-west-2',
+                               config=Config(signature_version=UNSIGNED))
     try:
         s3.get_bucket_location(Bucket='mybucket')
     except ClientError:

tox.ini

@@ -31,6 +31,8 @@ commands =
 
 setenv =
     DJANGO_SETTINGS_MODULE = tests.ext.django.app.settings
+    AWS_SECRET_ACCESS_KEY = fake_key
+    AWS_ACCESS_KEY_ID=fake_id
 
 [testenv:py35-aiohttp3]
 deps =