In-memory _schemas database tracking schemas of attached tables, closes #1150

tests/test_plugins.py

@@ -293,7 +293,7 @@ def test_hook_extra_body_script(app_client, path, expected_extra_body_script):
 
 def test_hook_asgi_wrapper(app_client):
     response = app_client.get("/fixtures")
-    assert "fixtures" == response.headers["x-databases"]
+    assert "_schemas, fixtures" == response.headers["x-databases"]
 
 
 def test_hook_extra_template_vars(restore_working_directory):

tests/test_schemas.py

@@ -0,0 +1,68 @@
+from .fixtures import app_client
+import pytest
+
+
+def test_schemas_only_available_to_root(app_client):
+    cookie = app_client.actor_cookie({"id": "root"})
+    assert app_client.get("/_schemas").status == 403
+    assert app_client.get("/_schemas", cookies={"ds_actor": cookie}).status == 200
+
+
+def test_schemas_databases(app_client):
+    cookie = app_client.actor_cookie({"id": "root"})
+    databases = app_client.get(
+        "/_schemas/databases.json?_shape=array", cookies={"ds_actor": cookie}
+    ).json
+    assert len(databases) == 2
+    assert databases[0]["database_name"] == "_schemas"
+    assert databases[1]["database_name"] == "fixtures"
+
+
+def test_schemas_tables(app_client):
+    cookie = app_client.actor_cookie({"id": "root"})
+    tables = app_client.get(
+        "/_schemas/tables.json?_shape=array", cookies={"ds_actor": cookie}
+    ).json
+    assert len(tables) > 5
+    table = tables[0]
+    assert set(table.keys()) == {"rootpage", "table_name", "database_name", "sql"}
+
+
+def test_schemas_indexes(app_client):
+    cookie = app_client.actor_cookie({"id": "root"})
+    indexes = app_client.get(
+        "/_schemas/indexes.json?_shape=array", cookies={"ds_actor": cookie}
+    ).json
+    assert len(indexes) > 5
+    index = indexes[0]
+    assert set(index.keys()) == {
+        "partial",
+        "name",
+        "table_name",
+        "unique",
+        "seq",
+        "database_name",
+        "origin",
+    }
+
+
+def test_schemas_foreign_keys(app_client):
+    cookie = app_client.actor_cookie({"id": "root"})
+    foreign_keys = app_client.get(
+        "/_schemas/foreign_keys.json?_shape=array", cookies={"ds_actor": cookie}
+    ).json
+    assert len(foreign_keys) > 5
+    foreign_key = foreign_keys[0]
+    assert set(foreign_key.keys()) == {
+        "table",
+        "seq",
+        "on_update",
+        "on_delete",
+        "to",
+        "rowid",
+        "id",
+        "match",
+        "database_name",
+        "table_name",
+        "from",
+    }