Allow multiple schemas to be exposed in one instance (#1450)

The schema to use can be selected through the headers `Accept-Profile` for GET/HEAD and `Content-Profile` for POST/PATCH/PUT/DELETE.

This is based on the https://www.w3.org/TR/dx-prof-conneg/ttps://www.w3.org/TR/dx-prof-conneg/ spec.

Also increase all memory tests by 1M(otherwise CI fails).

Co-authored-by: Mahmoud Kassem <MKassem@gk-software.com>
Co-authored-by: Mahmoud Kassem <mahmoud_k@mail.com>

test/fixtures/data.sql

@@ -572,3 +572,12 @@ INSERT INTO activities(id, schedule_id, camera_id) VALUES(2, 3, 'CAM-123');
 
 TRUNCATE TABLE unit_workdays CASCADE;
 INSERT INTO unit_workdays VALUES(1, '2019-12-02', 1, 1, 2, 3);
+
+TRUNCATE TABLE v1.parents CASCADE;
+INSERT INTO v1.parents VALUES(1, 'parent v1-1'), (2, 'parent v1-2');
+
+TRUNCATE TABLE v2.parents CASCADE;
+INSERT INTO v2.parents VALUES(3, 'parent v2-3'), (4, 'parent v2-4');
+
+TRUNCATE TABLE v2.another_table CASCADE;
+INSERT INTO v2.another_table VALUES(5, 'value 5'), (6, 'value 6');

test/fixtures/database.sql

@@ -1,3 +1,3 @@
 set client_min_messages to warning;
-DROP SCHEMA IF EXISTS test, private, postgrest, jwt, public, تست, extensions CASCADE;
+DROP SCHEMA IF EXISTS test, private, postgrest, jwt, public, تست, extensions, v1, v2 CASCADE;
 DROP TYPE IF EXISTS jwt_token CASCADE;

test/fixtures/privileges.sql

@@ -6,6 +6,8 @@ GRANT USAGE ON SCHEMA
     , public
     , "تست"
     , extensions
+    , v1
+    , v2
 TO postgrest_test_anonymous;
 
 -- Schema test objects
@@ -122,6 +124,11 @@ GRANT ALL ON TABLE
     , unit_workdays
     , stuff
     , loc_test
+    , v1.parents
+    , v2.parents
+    , v2.another_table
+    , v1.childs
+    , v2.childs
 TO postgrest_test_anonymous;
 
 GRANT INSERT ON TABLE insertonly TO postgrest_test_anonymous;
@@ -131,6 +138,8 @@ GRANT USAGE ON SEQUENCE
     , items_id_seq
     , callcounter_count
     , leak_id_seq
+    , v1.childs_id_seq
+    , v2.childs_id_seq
 TO postgrest_test_anonymous;
 
 -- Privileges for non anonymous users

test/fixtures/schema.sql

@@ -18,6 +18,8 @@ CREATE SCHEMA private;
 CREATE SCHEMA test;
 CREATE SCHEMA تست;
 CREATE SCHEMA extensions;
+CREATE SCHEMA v1;
+CREATE SCHEMA v2;
 
 --
 -- Name: plpgsql; Type: EXTENSION; Schema: -; Owner: -
@@ -1693,3 +1695,45 @@ create table loc_test (
   id int primary key
 , c text
 );
+
+-- tables to test multi schema access in one instance
+create table v1.parents (
+  id    int primary key
+, name text
+);
+
+create table v1.childs (
+  id       serial primary key
+, name    text
+, parent_id int
+, constraint parent foreign key(parent_id)
+  references v1.parents(id)
+);
+
+create function v1.get_parents_below(id int)
+returns setof v1.parents as $$
+  select * from v1.parents where id < $1;
+$$ language sql;
+
+create table v2.parents (
+  id    int primary key
+, name text
+);
+
+create table v2.childs (
+  id    serial primary key
+, name text
+, parent_id int
+, constraint parent foreign key(parent_id)
+  references v2.parents(id)
+);
+
+create table v2.another_table (
+  id            int primary key
+, another_value text
+);
+
+create function v2.get_parents_below(id int)
+returns setof v2.parents as $$
+  select * from v2.parents where id < $1;
+$$ language sql;