Added the option to ignore missing segments (aws#338)

* Add `IGNORE_ERROR` option for `AWS_XRAY_CONTEXT_MISSING`

Author: stijndehaes

CHANGELOG.rst

@@ -2,6 +2,10 @@
 CHANGELOG
 =========
 
+Unreleased
+==========
+* improvement: Added support for IGNORE_ERROR option when context is missing. `PR338 <https://github.com/aws/aws-xray-sdk-python/pull/338>`_.
+
 2.9.0
 ==========
 * bugfix: Change logging behavior to avoid overflow. `PR302 <https://github.com/aws/aws-xray-sdk-python/pull/302>`_.

aws_xray_sdk/core/context.py

@@ -10,7 +10,7 @@
 log = logging.getLogger(__name__)
 
 MISSING_SEGMENT_MSG = 'cannot find the current segment/subsegment, please make sure you have a segment open'
-SUPPORTED_CONTEXT_MISSING = ('RUNTIME_ERROR', 'LOG_ERROR')
+SUPPORTED_CONTEXT_MISSING = ('RUNTIME_ERROR', 'LOG_ERROR', 'IGNORE_ERROR')
 CXT_MISSING_STRATEGY_KEY = 'AWS_XRAY_CONTEXT_MISSING'
 
 
@@ -121,7 +121,7 @@ def handle_context_missing(self):
         """
         if self.context_missing == 'RUNTIME_ERROR':
             raise SegmentNotFoundException(MISSING_SEGMENT_MSG)
-        else:
+        elif self.context_missing == 'LOG_ERROR':
             log.error(MISSING_SEGMENT_MSG)
 
     def _is_subsegment(self, entity):

aws_xray_sdk/core/recorder.py

@@ -112,6 +112,7 @@ def configure(self, sampling=None, plugins=None,
             RUNTIME_ERROR means the recorder will raise an exception.
             LOG_ERROR means the recorder will only log the error and
             do nothing.
+            IGNORE_ERROR means the recorder will do nothing
         :param str daemon_address: The X-Ray daemon address where the recorder
             sends data to.
         :param str service: default segment name if creating a segment without

docs/configurations.rst

@@ -92,6 +92,7 @@ Supported strategies are:
 
 * RUNTIME_ERROR: throw an SegmentNotFoundException
 * LOG_ERROR: log an error and continue
+* IGNORE_ERROR: do nothing
 
 Segment Dynamic Naming
 ----------------------

tests/ext/aiohttp/test_client.py

@@ -1,8 +1,11 @@
+import logging
+
 import pytest
 from aiohttp import ClientSession
 
 from aws_xray_sdk.core import xray_recorder
 from aws_xray_sdk.core.async_context import AsyncContext
+from aws_xray_sdk.core.context import MISSING_SEGMENT_MSG
 from aws_xray_sdk.core.exceptions.exceptions import SegmentNotFoundException
 from aws_xray_sdk.ext.util import strip_url, get_hostname
 from aws_xray_sdk.ext.aiohttp.client import aws_xray_trace_config
@@ -144,7 +147,8 @@ async def test_no_segment_raise(loop, recorder):
                 pass
 
 
-async def test_no_segment_not_raise(loop, recorder):
+async def test_no_segment_log_error(loop, recorder, caplog):
+    caplog.set_level(logging.ERROR)
     xray_recorder.configure(context_missing='LOG_ERROR')
     trace_config = aws_xray_trace_config()
     status_code = 200
@@ -155,3 +159,19 @@ async def test_no_segment_not_raise(loop, recorder):
 
     # Just check that the request was done correctly
     assert status_received == status_code
+    assert MISSING_SEGMENT_MSG in [rec.message for rec in caplog.records]
+
+
+async def test_no_segment_ignore_error(loop, recorder, caplog):
+    caplog.set_level(logging.ERROR)
+    xray_recorder.configure(context_missing='IGNORE_ERROR')
+    trace_config = aws_xray_trace_config()
+    status_code = 200
+    url = 'http://{}/status/{}?foo=bar'.format(BASE_URL, status_code)
+    async with ClientSession(loop=loop, trace_configs=[trace_config]) as session:
+        async with session.get(url) as resp:
+            status_received = resp.status
+
+    # Just check that the request was done correctly
+    assert status_received == status_code
+    assert MISSING_SEGMENT_MSG not in [rec.message for rec in caplog.records]