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models.py
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import functools
import inspect
import itertools
import os
import re
import unittest
from types import FunctionType
from typing import Any, Callable, Dict, Optional, Set, TypeVar
from unittest.mock import patch
import boto3
import botocore
import responses
from botocore.config import Config
from botocore.handlers import BUILTIN_HANDLERS
from moto import settings
from .base_backend import BackendDict
from .botocore_stubber import BotocoreStubber
from .custom_responses_mock import (
get_response_mock,
CallbackResponse,
not_implemented_callback,
reset_responses_mock,
)
DEFAULT_ACCOUNT_ID = "123456789012"
CALLABLE_RETURN = TypeVar("CALLABLE_RETURN")
class BaseMockAWS:
nested_count = 0
mocks_active = False
def __init__(self, backends: BackendDict):
from moto.instance_metadata import instance_metadata_backends
from moto.moto_api._internal.models import moto_api_backend
self.backends = backends
self.backends_for_urls = []
default_account_id = DEFAULT_ACCOUNT_ID
default_backends = [
instance_metadata_backends[default_account_id]["global"],
moto_api_backend,
]
backend_default_account = self.backends[default_account_id]
if "us-east-1" in backend_default_account:
# We only need to know the URL for a single region - they will be the same everywhere
self.backends_for_urls.append(backend_default_account["us-east-1"])
elif "global" in backend_default_account:
# If us-east-1 is not available, it's probably a global service
self.backends_for_urls.append(backend_default_account["global"])
self.backends_for_urls.extend(default_backends)
self.FAKE_KEYS = {
"AWS_ACCESS_KEY_ID": "foobar_key",
"AWS_SECRET_ACCESS_KEY": "foobar_secret",
}
self.ORIG_KEYS: Dict[str, Optional[str]] = {}
self.default_session_mock = patch("boto3.DEFAULT_SESSION", None)
if self.__class__.nested_count == 0:
self.reset() # type: ignore[attr-defined]
def __call__(self, func: Callable[..., Any], reset: bool = True) -> Any:
if inspect.isclass(func):
return self.decorate_class(func)
return self.decorate_callable(func, reset)
def __enter__(self) -> "BaseMockAWS":
self.start()
return self
def __exit__(self, *args: Any) -> None:
self.stop()
def start(self, reset: bool = True) -> None:
if not self.__class__.mocks_active:
self.default_session_mock.start()
self.mock_env_variables()
self.__class__.mocks_active = True
self.__class__.nested_count += 1
if reset:
for backend in self.backends.values():
backend.reset()
self.enable_patching(reset) # type: ignore[attr-defined]
def stop(self) -> None:
self.__class__.nested_count -= 1
if self.__class__.nested_count < 0:
raise RuntimeError("Called stop() before start().")
if self.__class__.nested_count == 0:
if self.__class__.mocks_active:
try:
self.default_session_mock.stop()
except RuntimeError:
# We only need to check for this exception in Python 3.6 and 3.7
# https://bugs.python.org/issue36366
pass
self.unmock_env_variables()
self.__class__.mocks_active = False
self.disable_patching() # type: ignore[attr-defined]
def decorate_callable(
self, func: Callable[..., CALLABLE_RETURN], reset: bool
) -> Callable[..., CALLABLE_RETURN]:
def wrapper(*args: Any, **kwargs: Any) -> CALLABLE_RETURN:
self.start(reset=reset)
try:
result = func(*args, **kwargs)
finally:
self.stop()
return result
functools.update_wrapper(wrapper, func)
wrapper.__wrapped__ = func # type: ignore[attr-defined]
return wrapper
def decorate_class(self, klass: type) -> object:
direct_methods = get_direct_methods_of(klass)
defined_classes = set(
x for x, y in klass.__dict__.items() if inspect.isclass(y)
)
# Get a list of all userdefined superclasses
superclasses = [
c for c in klass.__mro__ if c not in [unittest.TestCase, object]
]
# Get a list of all userdefined methods
supermethods = list(
itertools.chain(*[get_direct_methods_of(c) for c in superclasses])
)
# Check whether the user has overridden the setUp-method
has_setup_method = (
("setUp" in supermethods and unittest.TestCase in klass.__mro__)
or "setup" in supermethods
or "setup_method" in supermethods
)
for attr in itertools.chain(direct_methods, defined_classes):
if attr.startswith("_"):
continue
attr_value = getattr(klass, attr)
if not hasattr(attr_value, "__call__"):
continue
if not hasattr(attr_value, "__name__"):
continue
# Check if this is a classmethod. If so, skip patching
if inspect.ismethod(attr_value) and attr_value.__self__ is klass:
continue
# Check if this is a staticmethod. If so, skip patching
for cls in inspect.getmro(klass):
if attr_value.__name__ not in cls.__dict__:
continue
bound_attr_value = cls.__dict__[attr_value.__name__]
if not isinstance(bound_attr_value, staticmethod):
break
else:
# It is a staticmethod, skip patching
continue
try:
# Special case for UnitTests-class
is_test_method = attr.startswith(unittest.TestLoader.testMethodPrefix)
should_reset = False
if attr in ["setUp", "setup_method"]:
should_reset = True
elif not has_setup_method and is_test_method:
should_reset = True
else:
# Method is unrelated to the test setup
# Method is a test, but was already reset while executing the setUp-method
pass
setattr(klass, attr, self(attr_value, reset=should_reset))
except TypeError:
# Sometimes we can't set this for built-in types
continue
return klass
def mock_env_variables(self) -> None:
# "Mock" the AWS credentials as they can't be mocked in Botocore currently
# self.env_variables_mocks = mock.patch.dict(os.environ, FAKE_KEYS)
# self.env_variables_mocks.start()
for k, v in self.FAKE_KEYS.items():
self.ORIG_KEYS[k] = os.environ.get(k, None)
os.environ[k] = v
def unmock_env_variables(self) -> None:
# This doesn't work in Python2 - for some reason, unmocking clears the entire os.environ dict
# Obviously bad user experience, and also breaks pytest - as it uses PYTEST_CURRENT_TEST as an env var
# self.env_variables_mocks.stop()
for k, v in self.ORIG_KEYS.items():
if v:
os.environ[k] = v
else:
del os.environ[k]
def get_direct_methods_of(klass: object) -> Set[str]:
return set(
x
for x, y in klass.__dict__.items()
if isinstance(y, (FunctionType, classmethod, staticmethod))
)
RESPONSES_METHODS = [
responses.GET,
responses.DELETE,
responses.HEAD,
responses.OPTIONS,
responses.PATCH,
responses.POST,
responses.PUT,
]
botocore_mock = responses.RequestsMock(
assert_all_requests_are_fired=False,
target="botocore.vendored.requests.adapters.HTTPAdapter.send",
)
responses_mock = get_response_mock()
BOTOCORE_HTTP_METHODS = ["GET", "DELETE", "HEAD", "OPTIONS", "PATCH", "POST", "PUT"]
botocore_stubber = BotocoreStubber()
BUILTIN_HANDLERS.append(("before-send", botocore_stubber))
def patch_client(client: botocore.client.BaseClient) -> None:
"""
Explicitly patch a boto3-client
"""
"""
Adding the botocore_stubber to the BUILTIN_HANDLERS, as above, will mock everything as long as the import ordering is correct
- user: start mock_service decorator
- system: imports core.model
- system: adds the stubber to the BUILTIN_HANDLERS
- user: create a boto3 client - which will use the BUILTIN_HANDLERS
But, if for whatever reason the imports are wrong and the client is created first, it doesn't know about our stub yet
This method can be used to tell a client that it needs to be mocked, and append the botocore_stubber after creation
:param client:
:return:
"""
if isinstance(client, botocore.client.BaseClient):
client.meta.events.register("before-send", botocore_stubber)
else:
raise Exception(f"Argument {client} should be of type boto3.client")
def patch_resource(resource: Any) -> None:
"""
Explicitly patch a boto3-resource
"""
if hasattr(resource, "meta") and isinstance(
resource.meta, boto3.resources.factory.ResourceMeta
):
patch_client(resource.meta.client)
else:
raise Exception(f"Argument {resource} should be of type boto3.resource")
class BotocoreEventMockAWS(BaseMockAWS):
def reset(self) -> None:
botocore_stubber.reset()
reset_responses_mock(responses_mock)
def enable_patching(
self, reset: bool = True # pylint: disable=unused-argument
) -> None:
# Circumvent circular imports
from .utils import convert_flask_to_responses_response
botocore_stubber.enabled = True
for method in BOTOCORE_HTTP_METHODS:
for backend in self.backends_for_urls:
for key, value in backend.urls.items():
pattern = re.compile(key)
botocore_stubber.register_response(method, pattern, value)
if not hasattr(responses_mock, "_patcher") or not hasattr(
responses_mock._patcher, "target"
):
responses_mock.start()
for method in RESPONSES_METHODS:
# for backend in default_backends.values():
for backend in self.backends_for_urls:
for key, value in backend.urls.items():
responses_mock.add(
CallbackResponse(
method=method,
url=re.compile(key),
callback=convert_flask_to_responses_response(value),
)
)
responses_mock.add(
CallbackResponse(
method=method,
url=re.compile(r"https?://.+\.amazonaws.com/.*"),
callback=not_implemented_callback,
)
)
botocore_mock.add(
CallbackResponse(
method=method,
url=re.compile(r"https?://.+\.amazonaws.com/.*"),
callback=not_implemented_callback,
)
)
def disable_patching(self) -> None:
botocore_stubber.enabled = False
self.reset()
try:
responses_mock.stop()
except RuntimeError:
pass
MockAWS = BotocoreEventMockAWS
class ServerModeMockAWS(BaseMockAWS):
RESET_IN_PROGRESS = False
def __init__(self, *args: Any, **kwargs: Any):
self.test_server_mode_endpoint = settings.test_server_mode_endpoint()
super().__init__(*args, **kwargs)
def reset(self) -> None:
call_reset_api = os.environ.get("MOTO_CALL_RESET_API")
if not call_reset_api or call_reset_api.lower() != "false":
if not ServerModeMockAWS.RESET_IN_PROGRESS:
ServerModeMockAWS.RESET_IN_PROGRESS = True
import requests
requests.post(f"{self.test_server_mode_endpoint}/moto-api/reset")
ServerModeMockAWS.RESET_IN_PROGRESS = False
def enable_patching(self, reset: bool = True) -> None:
if self.__class__.nested_count == 1 and reset:
# Just started
self.reset()
from boto3 import client as real_boto3_client, resource as real_boto3_resource
def fake_boto3_client(*args: Any, **kwargs: Any) -> botocore.client.BaseClient:
region = self._get_region(*args, **kwargs)
if region:
if "config" in kwargs:
kwargs["config"].__dict__["user_agent_extra"] += " region/" + region
else:
config = Config(user_agent_extra="region/" + region)
kwargs["config"] = config
if "endpoint_url" not in kwargs:
kwargs["endpoint_url"] = self.test_server_mode_endpoint
return real_boto3_client(*args, **kwargs)
def fake_boto3_resource(*args: Any, **kwargs: Any) -> Any:
if "endpoint_url" not in kwargs:
kwargs["endpoint_url"] = self.test_server_mode_endpoint
return real_boto3_resource(*args, **kwargs)
self._client_patcher = patch("boto3.client", fake_boto3_client)
self._resource_patcher = patch("boto3.resource", fake_boto3_resource)
self._client_patcher.start()
self._resource_patcher.start()
def _get_region(self, *args: Any, **kwargs: Any) -> Optional[str]:
if "region_name" in kwargs:
return kwargs["region_name"]
if type(args) == tuple and len(args) == 2:
_, region = args
return region
return None
def disable_patching(self) -> None:
if self._client_patcher:
self._client_patcher.stop()
self._resource_patcher.stop()
class base_decorator:
mock_backend = MockAWS
def __init__(self, backends: BackendDict):
self.backends = backends
def __call__(self, func: Optional[Callable[..., Any]] = None) -> BaseMockAWS:
if settings.TEST_SERVER_MODE:
mocked_backend: BaseMockAWS = ServerModeMockAWS(self.backends)
else:
mocked_backend = self.mock_backend(self.backends)
if func:
return mocked_backend(func)
else:
return mocked_backend