refactor(remove): schema cache load delay config

Remove internal schema cache load and relationship load sleep settings plus
the delay wrappers they enabled. Drop IO tests that depended on the removed
settings.

src/PostgREST/Config.hs

@@ -119,8 +119,6 @@ data AppConfig = AppConfig
   , configRoleSettings             :: RoleSettings
   , configRoleIsoLvl               :: RoleIsolationLvl
   , configInternalSCQuerySleep     :: Maybe Int32
-  , configInternalSCLoadSleep      :: Maybe Int32
-  , configInternalSCRelLoadSleep   :: Maybe Int32
   }
 
 data LogLevel = LogCrit | LogError | LogWarn | LogInfo | LogDebug
@@ -304,8 +302,6 @@ parser optPath env dbSettings roleSettings roleIsolationLvl =
     <*> pure roleSettings
     <*> pure roleIsolationLvl
     <*> optInt "internal-schema-cache-query-sleep"
-    <*> optInt "internal-schema-cache-load-sleep"
-    <*> optInt "internal-schema-cache-relationship-load-sleep"
   where
     parseAppSettings :: C.Key -> C.Parser C.Config [(Text, Text)]
     parseAppSettings key = addFromEnv . fmap (fmap coerceText) <$> C.subassocs key C.value

src/PostgREST/SchemaCache.hs

@@ -67,10 +67,9 @@ import PostgREST.SchemaCache.Table           (Column (..), ColumnMap,
 
 import qualified PostgREST.MediaType as MediaType
 
-import           Control.Arrow    ((&&&))
-import qualified Data.FuzzySet    as Fuzzy
+import           Control.Arrow ((&&&))
+import qualified Data.FuzzySet as Fuzzy
 import           Protolude
-import           System.IO.Unsafe (unsafePerformIO)
 
 type TablesFuzzyIndex = HM.HashMap Schema Fuzzy.FuzzySet
 
@@ -167,11 +166,9 @@ querySchemaCache conf@AppConfig{..} = do
   let tabsWViewsPks = addViewPrimaryKeys tabs keyDeps
       rels          = addInverseRels $ addM2MRels tabsWViewsPks $ addViewM2OAndO2ORels keyDeps m2oRels
 
-  -- Add delay in loading schema cache when internal-schema-cache-load-sleep config is set
-  return $ delayEval configInternalSCLoadSleep $ removeInternal schemas $ SchemaCache {
+  return $ removeInternal schemas $ SchemaCache {
       dbTables = tabsWViewsPks
-    -- Add delay in loading relationships when internal-schema-cache-relationship-load-sleep config is set
-    , dbRelationships = delayEval configInternalSCRelLoadSleep $ getOverrideRelationshipsMap rels cRels
+    , dbRelationships = getOverrideRelationshipsMap rels cRels
     , dbRoutines = funcs
     , dbRepresentations = reps
     , dbMediaHandlers = HM.union mHdlers initialMediaHandlers -- the custom handlers will override the initial ones
@@ -185,7 +182,6 @@ querySchemaCache conf@AppConfig{..} = do
   where
     schemas = toList configDbSchemas
     prepared = configDbPreparedStatements
-    delayEval confDelay result = maybe result (unsafePerformIO . (($> result) . (threadDelay . (1000 *) . fromIntegral))) confDelay
 
 -- | overrides detected relationships with the computed relationships and gets the RelationshipsMap
 getOverrideRelationshipsMap :: [Relationship] -> [Relationship] -> RelationshipsMap

test/io/test_io.py

@@ -1201,31 +1201,6 @@ def test_schema_cache_query_sleep_logs(defaultenv):
         assert 1000 < observed_ms < 2000
 
 
-def test_schema_cache_load_sleep_logs(defaultenv):
-    """Schema cache load sleep should be reflected in the logged load duration."""
-
-    env = {
-        **defaultenv,
-        "PGRST_INTERNAL_SCHEMA_CACHE_LOAD_SLEEP": "1000",
-    }
-    log_pattern = re.compile(r"Schema cache loaded in ([\d.]+) milliseconds")
-
-    with run(env=env, wait_max_seconds=3, no_startup_stdout=False) as postgrest:
-        observed_ms = None
-        collected = []
-
-        lines = postgrest.read_stdout(nlines=10)
-        collected.extend(lines)
-        for line in lines:
-            match = log_pattern.search(line)
-            if match:
-                observed_ms = float(match.group(1))
-                break
-
-        assert observed_ms is not None
-        assert 1000 < observed_ms < 2000
-
-
 @pytest.mark.parametrize("dburi_type", ["no_params", "no_params_qmark", "with_params"])
 def test_get_pgrst_version_with_uri_connection_string(dburi_type, dburi, defaultenv):
     "The fallback_application_name should be added to the db-uri if it has a URI format"
@@ -1807,54 +1782,6 @@ def test_db_pre_config_with_pg_reserved_words(defaultenv):
         )
 
 
-def test_requests_with_resource_embedding_wait_for_schema_cache_reload(defaultenv):
-    "requests that use the schema cache with resource embedding wait long for the schema cache to reload"
-
-    env = {
-        **defaultenv,
-        "PGRST_DB_POOL": "2",
-        "PGRST_INTERNAL_SCHEMA_CACHE_RELATIONSHIP_LOAD_SLEEP": "5100",
-    }
-
-    with run(env=env, wait_max_seconds=30) as postgrest:
-        # reload the schema cache
-        response = postgrest.session.get("/rpc/notify_pgrst")
-        assert response.status_code == 204
-
-        postgrest.wait_until_scache_starts_loading()
-
-        response = postgrest.session.get("/directors?select=id,name,films(title)")
-        assert response.status_code == 200
-
-        assert response.elapsed.total_seconds() > 5
-
-
-def test_requests_without_resource_embedding_wait_for_schema_cache_reload(defaultenv):
-    "requests that use the schema cache without resource embedding wait less for the schema cache to reload"
-
-    env = {
-        **defaultenv,
-        "PGRST_DB_POOL": "2",
-        "PGRST_INTERNAL_SCHEMA_CACHE_LOAD_SLEEP": "1100",
-        "PGRST_INTERNAL_SCHEMA_CACHE_RELATIONSHIP_LOAD_SLEEP": "5000",
-    }
-
-    with run(env=env, wait_max_seconds=30) as postgrest:
-        # reload the schema cache
-        response = postgrest.session.get("/rpc/notify_pgrst")
-        assert response.status_code == 204
-
-        postgrest.wait_until_scache_starts_loading()
-
-        response = postgrest.session.get("/films")
-        assert response.status_code == 200
-
-        assert (
-            response.elapsed.total_seconds() > 1
-            and response.elapsed.total_seconds() < 5
-        )
-
-
 def test_server_timing_transaction_duration(defaultenv, metapostgrest):
     "server-timing transaction duration should be accurate"
 

test/observability/ObsHelper.hs

@@ -114,8 +114,6 @@ baseCfg = let secret = encodeUtf8 "reallyreallyreallyreallyverysafe" in
   , configRoleSettings              = mempty
   , configRoleIsoLvl                = mempty
   , configInternalSCQuerySleep      = Nothing
-  , configInternalSCLoadSleep       = Nothing
-  , configInternalSCRelLoadSleep    = Nothing
   , configServerTimingEnabled       = True
   }
 

test/spec/SpecHelper.hs

@@ -157,8 +157,6 @@ baseCfg = let secret = encodeUtf8 "reallyreallyreallyreallyverysafe" in
   , configRoleSettings              = mempty
   , configRoleIsoLvl                = mempty
   , configInternalSCQuerySleep      = Nothing
-  , configInternalSCLoadSleep       = Nothing
-  , configInternalSCRelLoadSleep    = Nothing
   , configServerTimingEnabled       = True
   }