transaction-scoped settings are now shown clearly in the postgres logs

CHANGELOG.md

@@ -23,6 +23,9 @@ This project adheres to [Semantic Versioning](http://semver.org/).
  - #1070, Fix HTTP status responses for upserts - @taimoorzaeem
    + `PUT` returns `201` instead of `200` when rows are inserted
    + `POST` with `Prefer: resolution=merge-duplicates` returns `200` instead of `201` when no rows are inserted
+ - #3019, Transaction-Scoped Settings are now shown clearly in the Postgres logs - @laurenceisla
+   + Shows `set_config('pgrst.setting_name', $1)` instead of `setconfig($1, $2)`
+   + Does not apply to role settings and `app.settings.*`
 
 ### Changed
 

src/PostgREST/Query.hs

@@ -47,8 +47,9 @@ import PostgREST.Plan                    (CallReadPlan (..),
 import PostgREST.Plan.MutatePlan         (MutatePlan (..))
 import PostgREST.Query.SqlFragment       (escapeIdentList, fromQi,
                                           intercalateSnippet,
-                                          setConfigLocal,
-                                          setConfigLocalJson)
+                                          setConfigWithConstantName,
+                                          setConfigWithConstantNameJSON,
+                                          setConfigWithDynamicName)
 import PostgREST.Query.Statements        (ResultSet (..))
 import PostgREST.SchemaCache             (SchemaCache (..))
 import PostgREST.SchemaCache.Identifiers (QualifiedIdentifier (..),
@@ -239,17 +240,17 @@ setPgLocals AppConfig{..} claims role roleSettings req = lift $
     ("select " <> intercalateSnippet ", " (searchPathSql : roleSql ++ roleSettingsSql ++ claimsSql ++ [methodSql, pathSql] ++ headersSql ++ cookiesSql ++ appSettingsSql))
     HD.noResult configDbPreparedStatements
   where
-    methodSql = setConfigLocal ("request.method", iMethod req)
-    pathSql = setConfigLocal ("request.path", iPath req)
-    headersSql = setConfigLocalJson "request.headers" (iHeaders req)
-    cookiesSql = setConfigLocalJson "request.cookies" (iCookies req)
-    claimsSql = [setConfigLocal ("request.jwt.claims", LBS.toStrict $ JSON.encode claims)]
-    roleSql = [setConfigLocal ("role", role)]
-    roleSettingsSql = setConfigLocal <$> roleSettings
-    appSettingsSql = setConfigLocal <$> (join bimap toUtf8 <$> configAppSettings)
+    methodSql = setConfigWithConstantName ("request.method", iMethod req)
+    pathSql = setConfigWithConstantName ("request.path", iPath req)
+    headersSql = setConfigWithConstantNameJSON "request.headers" (iHeaders req)
+    cookiesSql = setConfigWithConstantNameJSON "request.cookies" (iCookies req)
+    claimsSql = [setConfigWithConstantName ("request.jwt.claims", LBS.toStrict $ JSON.encode claims)]
+    roleSql = [setConfigWithConstantName ("role", role)]
+    roleSettingsSql = setConfigWithDynamicName <$> roleSettings
+    appSettingsSql = setConfigWithDynamicName <$> (join bimap toUtf8 <$> configAppSettings)
     searchPathSql =
       let schemas = escapeIdentList (iSchema req : configDbExtraSearchPath) in
-      setConfigLocal ("search_path", schemas)
+      setConfigWithConstantName ("search_path", schemas)
 
 -- | Runs the pre-request function.
 runPreReq :: AppConfig -> DbHandler ()

src/PostgREST/Query/SqlFragment.hs

@@ -33,8 +33,9 @@ module PostgREST.Query.SqlFragment
   , unknownEncoder
   , intercalateSnippet
   , explainF
-  , setConfigLocal
-  , setConfigLocalJson
+  , setConfigWithConstantName
+  , setConfigWithDynamicName
+  , setConfigWithConstantNameJSON
   , escapeIdent
   , escapeIdentList
   ) where
@@ -484,14 +485,23 @@ explainF fmt opts snip =
     fmtPlanFmt PlanJSON = "FORMAT JSON"
 
 -- | Do a pg set_config(setting, value, true) call. This is equivalent to a SET LOCAL.
-setConfigLocal :: (ByteString, ByteString) -> SQL.Snippet
+setConfigLocal :: (SQL.Snippet, ByteString) -> SQL.Snippet
 setConfigLocal (k, v) =
-  "set_config(" <> unknownEncoder k <> ", " <> unknownEncoder v <> ", true)"
+  "set_config(" <> k <> ", " <> unknownEncoder v <> ", true)"
+
+-- | For when the settings are hardcoded and not parameterized
+setConfigWithConstantName :: (SQL.Snippet, ByteString) -> SQL.Snippet
+setConfigWithConstantName (k, v) = setConfigLocal ("'" <> k <> "'", v)
+
+-- | For when the settings need to be parameterized
+setConfigWithDynamicName :: (ByteString, ByteString) -> SQL.Snippet
+setConfigWithDynamicName (k, v) =
+  setConfigLocal (unknownEncoder k, v)
 
 -- | Starting from PostgreSQL v14, some characters are not allowed for config names (mostly affecting headers with "-").
 -- | A JSON format string is used to avoid this problem. See https://github.com/PostgREST/postgrest/issues/1857
-setConfigLocalJson :: ByteString -> [(ByteString, ByteString)] -> [SQL.Snippet]
-setConfigLocalJson prefix keyVals = [setConfigLocal (prefix, gucJsonVal keyVals)]
+setConfigWithConstantNameJSON :: SQL.Snippet -> [(ByteString, ByteString)] -> [SQL.Snippet]
+setConfigWithConstantNameJSON prefix keyVals = [setConfigWithConstantName (prefix, gucJsonVal keyVals)]
   where
     gucJsonVal :: [(ByteString, ByteString)] -> ByteString
     gucJsonVal = LBS.toStrict . JSON.encode . HM.fromList . arrayByteStringToText