ref: remove python-memcache (#63375)

we're now using the pymemcache backend everywhere!
<!-- Describe your PR here. -->

requirements-base.txt

@@ -47,8 +47,6 @@ PyJWT>=2.4.0
 pydantic>=1.10.9
 python-dateutil>=2.8.2
 pymemcache
-# TODO: once pymemcache is validated, remove python-memcached
-python-memcached>=1.59
 python-u2flib-server>=5.0.0
 fido2>=0.9.2
 python3-saml>=1.15.0

requirements-dev-frozen.txt

@@ -149,7 +149,6 @@ pytest-rerunfailures==11.0
 pytest-sentry==0.1.11
 pytest-xdist==3.0.2
 python-dateutil==2.8.2
-python-memcached==1.59
 python-rapidjson==1.8
 python-u2flib-server==5.0.0
 python-utils==3.3.3

requirements-frozen.txt

@@ -97,7 +97,6 @@ pyjwt==2.4.0
 pymemcache==4.0.0
 pyparsing==3.0.9
 python-dateutil==2.8.2
-python-memcached==1.59
 python-rapidjson==1.8
 python-u2flib-server==5.0.0
 python-utils==3.3.3

self-hosted/sentry.conf.py

@@ -115,7 +115,7 @@
     memcached_port = env("SENTRY_MEMCACHED_PORT") or "11211"
     CACHES = {
         "default": {
-            "BACKEND": "sentry.utils.memcached.MemcachedCache",
+            "BACKEND": "django.core.cache.backends.memcached.PyMemcacheCache",
             "LOCATION": [memcached + ":" + memcached_port],
             "TIMEOUT": 3600,
         }

src/sentry/data/config/sentry.conf.py.default

@@ -46,7 +46,7 @@ DEBUG = %(debug_flag)s
 #
 # CACHES = {
 #     'default': {
-#         'BACKEND': 'sentry.utils.memcached.MemcachedCache',
+#         'BACKEND': 'django.core.cache.backends.memcached.PyMemcacheCache',
 #         'LOCATION': ['127.0.0.1:11211'],
 #     }
 # }

src/sentry/services/http.py

@@ -48,17 +48,13 @@ def __init__(
         port: int | None = None,
         debug: bool = False,
         workers: int | None = None,
-        validate: bool = True,
         extra_options: dict[str, Any] | None = None,
     ) -> None:
         from django.conf import settings
 
         from sentry import options as sentry_options
         from sentry.logging import LoggingFormat
 
-        if validate:
-            self.validate_settings()
-
         host = host or settings.SENTRY_WEB_HOST
         port = port or settings.SENTRY_WEB_PORT
 
@@ -146,13 +142,6 @@ def __init__(
         self.options = options
         self.debug = debug
 
-    def validate_settings(self) -> None:
-        from django.conf import settings as django_settings
-
-        from sentry.utils.settings import validate_settings
-
-        validate_settings(django_settings)
-
     def prepare_environment(self, env: MutableMapping[str, str] | None = None) -> None:
         from django.conf import settings
 

src/sentry/utils/settings.py

@@ -1,49 +1,3 @@
-from sentry.utils.imports import import_string
-
-PACKAGES = {
-    "django.db.backends.postgresql_psycopg2": "psycopg2.extensions",
-    "sentry.db.postgres": "psycopg2.extensions",
-    "sentry.utils.memcached.MemcachedCache": "memcache",
-    "django.core.cache.backends.memcached.PyLibMCCache": "pylibmc",
-}
-
-
-def validate_settings(settings):
-    for key, engine_key, engine_type in [
-        ("DATABASES", "ENGINE", "database engine"),
-        ("CACHES", "BACKEND", "caching backend"),
-    ]:
-
-        value = getattr(settings, key, {})
-        for alias in value:
-            engine = value[alias][engine_key]
-            if engine not in PACKAGES:
-                continue
-            validate_dependency(settings, engine_type, engine, PACKAGES[engine])
-
-
-def validate_dependency(settings, dependency_type, dependency, package):
-    try:
-        import_string(package)
-    except ImportError as e:
-        msg = ConfigurationError.get_error_message(f"{dependency_type} {dependency}", package)
-        raise ConfigurationError(msg).with_traceback(e.__traceback__)
-
-
-class ConfigurationError(ValueError):
-    """
-    This error is thrown whenever a sentry configuration is wrong, or requires a third-party library
-    that's not installed properly or can't be found.
-    """
-
-    @classmethod
-    def get_error_message(cls, dependency, package):
-        return (
-            """Python could not find %(package)s in your current environment (required by %(dependency)s). If you have it installed, maybe you are using the wrong python binary to run sentry?"""
-            % {"dependency": dependency, "package": package}
-        )
-
-
 def is_self_hosted() -> bool:
     # Backcompat for rename to support old consumers, particularly single-tenant.
     from django.conf import settings