Cleanup after drop of support for Python < 3.7 (#387)

* Remove unused config for Travis CI

* Remove classifiers for unsupported Python versions

* Add `python_requires` and remove unused dependencies

* Use Python 3 style `super()` calls

* Use “new style” classes

Stop inheriting from object explicitly

* Remove compatibility code for Python < 3.7

* Remove unnecessary future imports

* Remove `string_types` from compat module

Author: michael-k

.travis.yml

@@ -1,13 +1,8 @@
+from .async_recorder import AsyncAWSXRayRecorder
+from .patcher import patch, patch_all
 from .recorder import AWSXRayRecorder
-from .patcher import patch_all, patch
-from .utils.compat import PY35
 
-
-if not PY35:
-    xray_recorder = AWSXRayRecorder()
-else:
-    from .async_recorder import AsyncAWSXRayRecorder
-    xray_recorder = AsyncAWSXRayRecorder()
+xray_recorder = AsyncAWSXRayRecorder()
 
 __all__ = [
     'patch',

aws_xray_sdk/core/__init__.py

@@ -1,11 +1,8 @@
 import asyncio
-import sys
 import copy
 
 from .context import Context as _Context
 
-_GTE_PY37 = sys.version_info.major == 3 and sys.version_info.minor >= 7
-
 
 class AsyncContext(_Context):
     """
@@ -16,7 +13,7 @@ class AsyncContext(_Context):
     Also overrides clear_trace_entities
     """
     def __init__(self, *args, loop=None, use_task_factory=True, **kwargs):
-        super(AsyncContext, self).__init__(*args, **kwargs)
+        super().__init__(*args, **kwargs)
 
         self._loop = loop
         if loop is None:
@@ -35,7 +32,7 @@ def clear_trace_entities(self):
             self._local.clear()
 
 
-class TaskLocalStorage(object):
+class TaskLocalStorage:
     """
     Simple task local storage
     """
@@ -51,10 +48,7 @@ def __setattr__(self, name, value):
 
         else:
             # Set task local attributes
-            if _GTE_PY37:
-                task = asyncio.current_task(loop=self._loop)
-            else:
-                task = asyncio.Task.current_task(loop=self._loop)
+            task = asyncio.current_task(loop=self._loop)
             if task is None:
                 return None
 
@@ -68,10 +62,7 @@ def __getattribute__(self, item):
             # Return references to local objects
             return object.__getattribute__(self, item)
 
-        if _GTE_PY37:
-            task = asyncio.current_task(loop=self._loop)
-        else:
-            task = asyncio.Task.current_task(loop=self._loop)
+        task = asyncio.current_task(loop=self._loop)
         if task is None:
             return None
 
@@ -82,10 +73,7 @@ def __getattribute__(self, item):
 
     def clear(self):
         # If were in a task, clear the context dictionary
-        if _GTE_PY37:
-            task = asyncio.current_task(loop=self._loop)
-        else:
-            task = asyncio.Task.current_task(loop=self._loop)
+        task = asyncio.current_task(loop=self._loop)
         if task is not None and hasattr(task, 'context'):
             task.context.clear()
 
@@ -104,10 +92,7 @@ def task_factory(loop, coro):
         del task._source_traceback[-1]  # flake8: noqa
 
     # Share context with new task if possible
-    if _GTE_PY37:
-        current_task = asyncio.current_task(loop=loop)
-    else:
-        current_task = asyncio.Task.current_task(loop=loop)
+    current_task = asyncio.current_task(loop=loop)
     if current_task is not None and hasattr(current_task, 'context'):
         if current_task.context.get('entities'):
             # NOTE: (enowell) Because the `AWSXRayRecorder`'s `Context` decides

aws_xray_sdk/core/async_context.py

@@ -14,7 +14,7 @@
 CXT_MISSING_STRATEGY_KEY = 'AWS_XRAY_CONTEXT_MISSING'
 
 
-class Context(object):
+class Context:
     """
     The context storage class to store trace entities(segments/subsegments).
     The default implementation uses threadlocal to store these entities.

aws_xray_sdk/core/context.py

@@ -6,7 +6,7 @@
 DEFAULT_ADDRESS = '127.0.0.1:2000'
 
 
-class DaemonConfig(object):
+class DaemonConfig:
     """The class that stores X-Ray daemon configuration about
     the ip address and port for UDP and TCP port. It gets the address
     string from ``AWS_TRACING_DAEMON_ADDRESS`` and then from recorder's

aws_xray_sdk/core/daemon_config.py

@@ -12,7 +12,7 @@
 DEFAULT_DAEMON_ADDRESS = '127.0.0.1:2000'
 
 
-class UDPEmitter(object):
+class UDPEmitter:
     """
     The default emitter the X-Ray recorder uses to send segments/subsegments
     to the X-Ray daemon over UDP using a non-blocking socket. If there is an

aws_xray_sdk/core/emitters/udp_emitter.py

@@ -1,7 +1,7 @@
 from ..utils.search_pattern import wildcard_match
 
 
-class DefaultDynamicNaming(object):
+class DefaultDynamicNaming:
     """
     Decides what name to use on a segment generated from an incoming request.
     By default it takes the host name and compares it to a pre-defined pattern.

aws_xray_sdk/core/models/default_dynamic_naming.py

@@ -18,9 +18,9 @@ class DummySegment(Segment):
     def __init__(self, name='dummy'):
         no_op_id = os.getenv('AWS_XRAY_NOOP_ID')
         if no_op_id and no_op_id.lower() == 'false':
-            super(DummySegment, self).__init__(name=name, traceid=TraceId().to_id())
+            super().__init__(name=name, traceid=TraceId().to_id())
         else:
-            super(DummySegment, self).__init__(name=name, traceid=NoOpTraceId().to_id(), entityid='0000000000000000')
+            super().__init__(name=name, traceid=NoOpTraceId().to_id(), entityid='0000000000000000')
         self.sampled = False
 
     def set_aws(self, aws_meta):
@@ -87,7 +87,7 @@ class DummySubsegment(Subsegment):
     """
 
     def __init__(self, segment, name='dummy'):
-        super(DummySubsegment, self).__init__(name, 'dummy', segment)
+        super().__init__(name, 'dummy', segment)
         no_op_id = os.getenv('AWS_XRAY_NOOP_ID')
         if no_op_id and no_op_id.lower() == 'false':
             super(Subsegment, self).__init__(name)

aws_xray_sdk/core/models/dummy_entities.py

@@ -6,7 +6,7 @@
 
 import json
 
-from ..utils.compat import annotation_value_types, string_types
+from ..utils.compat import annotation_value_types
 from ..utils.conversion import metadata_to_dict
 from .throwable import Throwable
 from . import http
@@ -21,7 +21,7 @@
 ORIGIN_TRACE_HEADER_ATTR_KEY = '_origin_trace_header'
 
 
-class Entity(object):
+class Entity:
     """
     The parent class for segment/subsegment. It holds common properties
     and methods on segment and subsegment.
@@ -113,7 +113,7 @@ def put_http_meta(self, key, value):
             return
 
         if key == http.STATUS:
-            if isinstance(value, string_types):
+            if isinstance(value, str):
                 value = int(value)
             self.apply_status_code(value)
 
@@ -139,7 +139,7 @@ def put_annotation(self, key, value):
         """
         self._check_ended()
 
-        if not isinstance(key, string_types):
+        if not isinstance(key, str):
             log.warning("ignoring non string type annotation key with type %s.", type(key))
             return
 
@@ -165,7 +165,7 @@ def put_metadata(self, key, value, namespace='default'):
         """
         self._check_ended()
 
-        if not isinstance(namespace, string_types):
+        if not isinstance(namespace, str):
             log.warning("ignoring non string type metadata namespace")
             return
 
@@ -271,7 +271,7 @@ def serialize(self):
     def to_dict(self):
         """
         Convert Entity(Segment/Subsegment) object to dict
-        with required properties that have non-empty values. 
+        with required properties that have non-empty values.
         """
         entity_dict = {}
 

aws_xray_sdk/core/models/entity.py

@@ -22,7 +22,7 @@ def __init__(self, name, entityid, traceid, sampled):
             sampled=sampled,
         )
 
-        super(FacadeSegment, self).__init__(
+        super().__init__(
             name=name,
             entityid=entityid,
             traceid=traceid,

aws_xray_sdk/core/models/facade_segment.py

@@ -63,7 +63,7 @@ def __init__(self, name, entityid=None, traceid=None,
         if not name:
             raise SegmentNameMissingException("Segment name is required.")
 
-        super(Segment, self).__init__(name)
+        super().__init__(name)
 
         if not traceid:
             traceid = TraceId().to_id()
@@ -85,7 +85,7 @@ def add_subsegment(self, subsegment):
         Add input subsegment as a child subsegment and increment
         reference counter and total subsegments counter.
         """
-        super(Segment, self).add_subsegment(subsegment)
+        super().add_subsegment(subsegment)
         self.increment()
 
     def increment(self):
@@ -127,15 +127,15 @@ def remove_subsegment(self, subsegment):
         """
         Remove the reference of input subsegment.
         """
-        super(Segment, self).remove_subsegment(subsegment)
+        super().remove_subsegment(subsegment)
         self.decrement_subsegments_size()
 
     def set_user(self, user):
         """
         set user of a segment. One segment can only have one user.
         User is indexed and can be later queried.
         """
-        super(Segment, self)._check_ended()
+        super()._check_ended()
         self.user = user
 
     def set_service(self, service_info):
@@ -160,7 +160,7 @@ def to_dict(self):
         Convert Segment object to dict with required properties
         that have non-empty values. 
         """ 
-        segment_dict = super(Segment, self).to_dict()
+        segment_dict = super().to_dict()
 
         del segment_dict['ref_counter']
         del segment_dict['_subsegments_counter']

aws_xray_sdk/core/models/segment.py

@@ -95,7 +95,7 @@ def __init__(self, name, namespace, segment):
             support `aws`, `remote` and `local`.
         :param Segment segment: The parent segment
         """
-        super(Subsegment, self).__init__(name)
+        super().__init__(name)
 
         if not segment:
             raise SegmentNotFoundException("A parent segment is required for creating subsegments.")
@@ -114,7 +114,7 @@ def add_subsegment(self, subsegment):
         reference counter and total subsegments counter of the
         parent segment.
         """
-        super(Subsegment, self).add_subsegment(subsegment)
+        super().add_subsegment(subsegment)
         self.parent_segment.increment()
 
     def remove_subsegment(self, subsegment):
@@ -124,7 +124,7 @@ def remove_subsegment(self, subsegment):
 
         :param Subsegment: subsegment to remove.
         """
-        super(Subsegment, self).remove_subsegment(subsegment)
+        super().remove_subsegment(subsegment)
         self.parent_segment.decrement_subsegments_size()
 
     def close(self, end_time=None):
@@ -136,7 +136,7 @@ def close(self, end_time=None):
         :param int end_time: Epoch in seconds. If not specified
             current time will be used.
         """
-        super(Subsegment, self).close(end_time)
+        super().close(end_time)
         self.parent_segment.decrement_ref_counter()
 
     def set_sql(self, sql):
@@ -154,7 +154,7 @@ def to_dict(self):
         Convert Subsegment object to dict with required properties
         that have non-empty values. 
         """    
-        subsegment_dict = super(Subsegment, self).to_dict()
+        subsegment_dict = super().to_dict()
 
         del subsegment_dict['parent_segment']
 

aws_xray_sdk/core/models/subsegment.py

@@ -3,12 +3,10 @@
 import binascii
 import logging
 
-from ..utils.compat import string_types
-
 log = logging.getLogger(__name__)
 
 
-class Throwable(object):
+class Throwable:
     """
     An object recording exception infomation under trace entity
     `cause` section. The information includes the stack trace,
@@ -31,7 +29,7 @@ def __init__(self, exception, stack, remote=False):
             message = None
 
         # do not record non-string exception message
-        if isinstance(message, string_types):
+        if isinstance(message, str):
             self.message = message
 
         self.type = type(exception).__name__

aws_xray_sdk/core/models/throwable.py

@@ -10,7 +10,7 @@
 HEADER_DELIMITER = ";"
 
 
-class TraceHeader(object):
+class TraceHeader:
     """
     The sampling decision and trace ID are added to HTTP requests in
     tracing headers named ``X-Amzn-Trace-Id``. The first X-Ray-integrated

aws_xray_sdk/core/models/trace_header.py

@@ -8,7 +8,7 @@
 import wrapt
 
 from aws_xray_sdk import global_sdk_config
-from .utils.compat import PY2, is_classmethod, is_instance_method
+from .utils.compat import is_classmethod, is_instance_method
 
 log = logging.getLogger(__name__)
 
@@ -55,17 +55,14 @@ def patch_all(double_patch=False):
 
 def _is_valid_import(module):
     module = module.replace('.', '/')
-    if PY2:
-        return bool(pkgutil.get_loader(module))
-    else:
-        realpath = os.path.realpath(module)
-        is_module = os.path.isdir(realpath) and (
-            os.path.isfile('{}/__init__.py'.format(module)) or os.path.isfile('{}/__init__.pyc'.format(module))
-        )
-        is_file = not is_module and (
-                os.path.isfile('{}.py'.format(module)) or os.path.isfile('{}.pyc'.format(module))
-        )
-        return is_module or is_file
+    realpath = os.path.realpath(module)
+    is_module = os.path.isdir(realpath) and (
+        os.path.isfile('{}/__init__.py'.format(module)) or os.path.isfile('{}/__init__.pyc'.format(module))
+    )
+    is_file = not is_module and (
+            os.path.isfile('{}.py'.format(module)) or os.path.isfile('{}.pyc'.format(module))
+    )
+    return is_module or is_file
 
 
 def patch(modules_to_patch, raise_errors=True, ignore_module_patterns=None):