[7.x] Tolerate RecursionError not being defined in Python<3.5

Co-authored-by: Seth Michael Larson <seth.larson@elastic.co>

elasticsearch/_async/http_aiohttp.py

@@ -22,7 +22,7 @@
 
 import urllib3  # type: ignore
 
-from ..compat import urlencode
+from ..compat import reraise_exceptions, urlencode
 from ..connection.base import Connection
 from ..exceptions import (
     ConnectionError,
@@ -304,7 +304,7 @@ async def perform_request(
                 duration = self.loop.time() - start
 
         # We want to reraise a cancellation or recursion error.
-        except (asyncio.CancelledError, RecursionError):
+        except reraise_exceptions:
             raise
         except Exception as e:
             self.log_request_fail(

elasticsearch/compat.py

@@ -58,8 +58,22 @@ def to_bytes(x, encoding="ascii"):
     from collections import Mapping
 
 
+try:
+    reraise_exceptions = (RecursionError,)
+except NameError:
+    reraise_exceptions = ()
+
+try:
+    import asyncio
+
+    reraise_exceptions += (asyncio.CancelledError,)
+except (ImportError, AttributeError):
+    pass
+
+
 __all__ = [
     "string_types",
+    "reraise_exceptions",
     "quote_plus",
     "quote",
     "urlencode",

elasticsearch/compat.pyi

@@ -16,13 +16,14 @@
 #  under the License.
 
 import sys
-from typing import Callable, Tuple, Union
+from typing import Callable, Tuple, Type, Union
 
 PY2: bool
 string_types: Tuple[type, ...]
 
 to_str: Callable[[Union[str, bytes]], str]
 to_bytes: Callable[[Union[str, bytes]], bytes]
+reraise_exceptions: Tuple[Type[Exception], ...]
 
 if sys.version_info[0] == 2:
     from itertools import imap as map

elasticsearch/connection/http_requests.py

@@ -18,7 +18,7 @@
 import time
 import warnings
 
-from ..compat import string_types, urlencode
+from ..compat import reraise_exceptions, string_types, urlencode
 from ..exceptions import (
     ConnectionError,
     ConnectionTimeout,
@@ -166,7 +166,7 @@ def perform_request(
             response = self.session.send(prepared_request, **send_kwargs)
             duration = time.time() - start
             raw_data = response.content.decode("utf-8", "surrogatepass")
-        except RecursionError:
+        except reraise_exceptions:
             raise
         except Exception as e:
             self.log_request_fail(

elasticsearch/connection/http_urllib3.py

@@ -24,7 +24,7 @@
 from urllib3.exceptions import SSLError as UrllibSSLError  # type: ignore
 from urllib3.util.retry import Retry  # type: ignore
 
-from ..compat import urlencode
+from ..compat import reraise_exceptions, urlencode
 from ..exceptions import (
     ConnectionError,
     ConnectionTimeout,
@@ -253,7 +253,7 @@ def perform_request(
             )
             duration = time.time() - start
             raw_data = response.data.decode("utf-8", "surrogatepass")
-        except RecursionError:
+        except reraise_exceptions:
             raise
         except Exception as e:
             self.log_request_fail(

test_elasticsearch/test_async/test_connection.py

@@ -29,6 +29,8 @@
 from multidict import CIMultiDict
 
 from elasticsearch import AIOHttpConnection, __versionstr__
+from elasticsearch.compat import reraise_exceptions
+from elasticsearch.exceptions import ConnectionError
 
 pytestmark = pytest.mark.asyncio
 
@@ -318,6 +320,20 @@ async def test_surrogatepass_into_bytes(self):
         status, headers, data = await con.perform_request("GET", "/")
         assert u"你好\uda6a" == data
 
+    @pytest.mark.parametrize("exception_cls", reraise_exceptions)
+    async def test_recursion_error_reraised(self, exception_cls):
+        conn = AIOHttpConnection()
+
+        def request_raise(*_, **__):
+            raise exception_cls("Wasn't modified!")
+
+        await conn._create_aiohttp_session()
+        conn.session.request = request_raise
+
+        with pytest.raises(exception_cls) as e:
+            await conn.perform_request("GET", "/")
+        assert str(e.value) == "Wasn't modified!"
+
 
 class TestConnectionHttpbin:
     """Tests the HTTP connection implementations against a live server E2E"""
@@ -389,3 +405,8 @@ async def test_aiohttp_connection(self):
             "Header2": "value2",
             "User-Agent": user_agent,
         }
+
+    async def test_aiohttp_connection_error(self):
+        conn = AIOHttpConnection("not.a.host.name")
+        with pytest.raises(ConnectionError):
+            await conn.perform_request("GET", "/")

test_elasticsearch/test_connection.py

@@ -32,13 +32,15 @@
 from urllib3._collections import HTTPHeaderDict
 
 from elasticsearch import __versionstr__
+from elasticsearch.compat import reraise_exceptions
 from elasticsearch.connection import (
     Connection,
     RequestsHttpConnection,
     Urllib3HttpConnection,
 )
 from elasticsearch.exceptions import (
     ConflictError,
+    ConnectionError,
     NotFoundError,
     RequestError,
     TransportError,
@@ -466,6 +468,21 @@ def test_surrogatepass_into_bytes(self):
         status, headers, data = con.perform_request("GET", "/")
         self.assertEqual(u"你好\uda6a", data)
 
+    @pytest.mark.skipif(
+        not reraise_exceptions, reason="RecursionError isn't defined in Python <3.5"
+    )
+    def test_recursion_error_reraised(self):
+        conn = Urllib3HttpConnection()
+
+        def urlopen_raise(*_, **__):
+            raise RecursionError("Wasn't modified!")
+
+        conn.pool.urlopen = urlopen_raise
+
+        with pytest.raises(RecursionError) as e:
+            conn.perform_request("GET", "/")
+        assert str(e.value) == "Wasn't modified!"
+
 
 class TestRequestsConnection(TestCase):
     def _get_mock_connection(
@@ -868,6 +885,21 @@ def test_surrogatepass_into_bytes(self):
         status, headers, data = con.perform_request("GET", "/")
         self.assertEqual(u"你好\uda6a", data)
 
+    @pytest.mark.skipif(
+        not reraise_exceptions, reason="RecursionError isn't defined in Python <3.5"
+    )
+    def test_recursion_error_reraised(self):
+        conn = RequestsHttpConnection()
+
+        def send_raise(*_, **__):
+            raise RecursionError("Wasn't modified!")
+
+        conn.session.send = send_raise
+
+        with pytest.raises(RecursionError) as e:
+            conn.perform_request("GET", "/")
+        assert str(e.value) == "Wasn't modified!"
+
 
 class TestConnectionHttpbin:
     """Tests the HTTP connection implementations against a live server E2E"""
@@ -942,6 +974,11 @@ def test_urllib3_connection(self):
             "User-Agent": user_agent,
         }
 
+    def test_urllib3_connection_error(self):
+        conn = Urllib3HttpConnection("not.a.host.name")
+        with pytest.raises(ConnectionError):
+            conn.perform_request("GET", "/")
+
     def test_requests_connection(self):
         # Defaults
         conn = RequestsHttpConnection("httpbin.org", port=443, use_ssl=True)
@@ -1003,3 +1040,8 @@ def test_requests_connection(self):
             "Header2": "value2",
             "User-Agent": user_agent,
         }
+
+    def test_requests_connection_error(self):
+        conn = RequestsHttpConnection("not.a.host.name")
+        with pytest.raises(ConnectionError):
+            conn.perform_request("GET", "/")