feat: dump config through Admin API

CHANGELOG.md

@@ -8,6 +8,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 ### Added
 
  - #2887, Add Preference `max-affected` to limit affected resources - @taimoorzaeem
+ - #3171, Add an ability to dump config via admin API - @skywriter
 
 ### Fixed
 

src/PostgREST/Admin.hs

@@ -11,6 +11,8 @@ import qualified Network.Wai.Handler.Warp  as Warp
 
 import Control.Monad.Extra (whenJust)
 
+import qualified Data.ByteString.Lazy as LBS
+
 import Network.Socket
 import Network.Socket.ByteString
 
@@ -18,6 +20,7 @@ import PostgREST.AppState (AppState)
 import PostgREST.Config   (AppConfig (..))
 
 import qualified PostgREST.AppState as AppState
+import qualified PostgREST.Config   as Config
 
 import Protolude
 import Protolude.Partial (fromJust)
@@ -45,6 +48,9 @@ admin appState appConfig req respond  = do
       respond $ Wai.responseLBS (if isMainAppReachable && isConnectionUp && isSchemaCacheLoaded then HTTP.status200 else HTTP.status503) [] mempty
     ["live"] ->
       respond $ Wai.responseLBS (if isMainAppReachable then HTTP.status200 else HTTP.status503) [] mempty
+    ["config"] -> do
+      config <- AppState.getConfig appState
+      respond $ Wai.responseLBS HTTP.status200 [] (LBS.fromStrict $ encodeUtf8 $ Config.toText config)
     _ ->
       respond $ Wai.responseLBS HTTP.status404 [] mempty
 

test/io/test_io.py

@@ -632,6 +632,16 @@ def test_change_statement_timeout_held_connection(defaultenv, metapostgrest):
             t.join()
 
 
+def test_admin_config(defaultenv):
+    "Should get a success response from the admin server containing current configuration"
+
+    with run(env=defaultenv) as postgrest:
+        response = postgrest.admin.get("/config")
+        print(response.text)
+        assert response.status_code == 200
+        assert "admin-server-port" in response.text
+
+
 def test_admin_ready_w_channel(defaultenv):
     "Should get a success response from the admin server ready endpoint when the LISTEN channel is enabled"