Add CI for Python 2.7, 3.4, 3.5, 3.6 (#86)

only manylinux builds are running all variants for now.

Also fix python 2

builder.json

@@ -25,7 +25,29 @@
             "variables": {
                 "openssl_include": "=/opt/openssl/include",
                 "openssl_lib": "=/opt/openssl/lib"
-            }
+            },
+            "post_build_steps": [
+                ["echo", "------ Python 3.6 ------"],
+                ["/opt/python/cp36-cp36m/bin/python", "setup.py", "--verbose", "build_ext", "--include-dirs{openssl_include}", "--library-dirs{openssl_lib}", "install"],
+                ["/opt/python/cp36-cp36m/bin/python", "-m", "unittest", "discover", "--verbose"],
+                ["/opt/python/cp37-cp37m/bin/python", "aws-c-http/integration-testing/http_client_test.py", "/opt/python/cp36-cp36m/bin/python", "elasticurl.py"],
+                ["echo", "------ Python 3.5 ------"],
+                ["/opt/python/cp35-cp35m/bin/python", "setup.py", "--verbose", "build_ext", "--include-dirs{openssl_include}", "--library-dirs{openssl_lib}", "install"],
+                ["/opt/python/cp35-cp35m/bin/python", "-m", "unittest", "discover", "--verbose"],
+                ["/opt/python/cp37-cp37m/bin/python", "aws-c-http/integration-testing/http_client_test.py", "/opt/python/cp35-cp35m/bin/python", "elasticurl.py"],
+                ["echo", "------ Python 3.4 ------"],
+                ["/opt/python/cp34-cp34m/bin/python", "setup.py", "--verbose", "build_ext", "--include-dirs{openssl_include}", "--library-dirs{openssl_lib}", "install"],
+                ["/opt/python/cp34-cp34m/bin/python", "-m", "unittest", "discover", "--verbose"],
+                ["/opt/python/cp37-cp37m/bin/python", "aws-c-http/integration-testing/http_client_test.py", "/opt/python/cp34-cp34m/bin/python", "elasticurl.py"],
+                ["echo", "------ Python 2.7 narrow-unicode ------"],
+                ["/opt/python/cp27-cp27m/bin/python", "setup.py", "--verbose", "build_ext", "--include-dirs{openssl_include}", "--library-dirs{openssl_lib}", "install"],
+                ["/opt/python/cp27-cp27m/bin/python", "-m", "unittest", "discover", "--verbose"],
+                ["/opt/python/cp37-cp37m/bin/python", "aws-c-http/integration-testing/http_client_test.py", "/opt/python/cp27-cp27m/bin/python", "elasticurl.py"],
+                ["echo", "------ Python 2.7 wide-unicode ------"],
+                ["/opt/python/cp27-cp27mu/bin/python", "setup.py", "--verbose", "build_ext", "--include-dirs{openssl_include}", "--library-dirs{openssl_lib}", "install"],
+                ["/opt/python/cp27-cp27mu/bin/python", "-m", "unittest", "discover", "--verbose"],
+                ["/opt/python/cp37-cp37m/bin/python", "aws-c-http/integration-testing/http_client_test.py", "/opt/python/cp27-cp27mu/bin/python", "elasticurl.py"]
+            ]
         }
     },
     "targets": {

elasticurl.py

@@ -10,10 +10,11 @@
 # on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 # express or implied. See the License for the specific language governing
 # permissions and limitations under the License.
+from __future__ import print_function
 import argparse
 import sys
 import os
-from io import BytesIO
+from io import BytesIO, open  # Python2's built-in open() doesn't return a stream
 from awscrt import io, http
 try:
     from urllib.parse import urlparse

setup.py

@@ -11,6 +11,7 @@
 # express or implied. See the License for the specific language governing
 # permissions and limitations under the License.
 
+from __future__ import print_function
 import distutils.ccompiler
 import glob
 import os

test/__init__.py

@@ -11,8 +11,10 @@
 # express or implied. See the License for the specific language governing
 # permissions and limitations under the License.
 
+from __future__ import print_function
 from awscrt import NativeResource
 import gc
+import inspect
 import sys
 import types
 import unittest
@@ -44,16 +46,24 @@ def tearDown(self):
                 # - the rest are what's causing this leak.
                 refcount = sys.getrefcount(i) - 2
 
-                # The act of iterating a WeakSet creates a reference. Don't show that.
-                referrers = gc.get_referrers(i)
-                for r in referrers:
-                    if isinstance(r, types.FrameType) and '_weakrefset.py' in str(r):
-                        referrers.remove(r)
-                        break
+                # Gather list of referrers, but don't show those created by the act of iterating the WeakSet
+                referrers = []
+                for r in gc.get_referrers(i):
+                    if isinstance(r, types.FrameType):
+                        frameinfo = inspect.getframeinfo(r)
+                        our_fault = (frameinfo.filename.endswith('_weakrefset.py') or
+                                     frameinfo.filename.endswith('test/__init__.py'))
+                        if our_fault:
+                            continue
+
+                    referrers.append(r)
 
                 print('  sys.getrefcount():', refcount)
                 print('  gc.referrers():', len(referrers))
                 for r in referrers:
-                    print('  -', r)
+                    if isinstance(r, types.FrameType):
+                        print('  -', inspect.getframeinfo(r))
+                    else:
+                        print('  -', r)
 
         self.assertEqual(0, len(NativeResource._living))

test/test_http_client.py

@@ -15,6 +15,7 @@
 from awscrt.http import HttpClientConnection, HttpClientStream, HttpHeaders, HttpRequest
 from awscrt.io import TlsContextOptions, ClientTlsContext, TlsConnectionOptions
 from concurrent.futures import Future
+from io import open  # Python2's built-in open() doesn't return a stream
 import ssl
 from test import NativeResourceTest
 import threading