schema: add "_vcollation" sysview

Add "_vcollation" sysview to read it from net.box. This
sysview is always readable, except when a user doesn't have
"public" role.

Needed for #3941

@TarantoolBot document
Title: box.space._vcollation

_vcollation is a system space that represents a virtual view.
The structure of its tuples is identical to that of _collation.
Tuples of this sysview is always readable, except when the user
doesn't have "public" role.

src/box/lua/space.cc

@@ -603,6 +603,8 @@ box_lua_space_init(struct lua_State *L)
 	lua_setfield(L, -2, "FUNC_ID");
 	lua_pushnumber(L, BOX_COLLATION_ID);
 	lua_setfield(L, -2, "COLLATION_ID");
+	lua_pushnumber(L, BOX_VCOLLATION_ID);
+	lua_setfield(L, -2, "VCOLLATION_ID");
 	lua_pushnumber(L, BOX_VFUNC_ID);
 	lua_setfield(L, -2, "VFUNC_ID");
 	lua_pushnumber(L, BOX_PRIV_ID);

src/box/lua/upgrade.lua

@@ -813,9 +813,17 @@ local function upgrade_ck_constraint_to_2_2_1()
     end
 end
 
+local function create_vcollation_space()
+    local _collation = box.space._collation
+    local format = _collation:format()
+    create_sysview(box.schema.COLLATION_ID, box.schema.VCOLLATION_ID)
+    box.space[box.schema.VCOLLATION_ID]:format(format)
+end
+
 local function upgrade_to_2_2_1()
     upgrade_sequence_to_2_2_1()
     upgrade_ck_constraint_to_2_2_1()
+    create_vcollation_space()
 end
 
 --------------------------------------------------------------------------------

src/box/schema_def.h

@@ -72,6 +72,8 @@ enum {
 	BOX_SCHEMA_ID = 272,
 	/** Space id of _collation. */
 	BOX_COLLATION_ID = 276,
+	/** Space id of _vcollation. */
+	BOX_VCOLLATION_ID = 277,
 	/** Space id of _space. */
 	BOX_SPACE_ID = 280,
 	/** Space id of _vspace view. */

src/box/sysview.c

@@ -402,6 +402,14 @@ vsequence_filter(struct space *source, struct tuple *tuple)
 	       ((PRIV_WRDA | PRIV_X) & effective);
 }
 
+static bool
+vcollation_filter(struct space *source, struct tuple *tuple)
+{
+	(void) source;
+	(void) tuple;
+	return true;
+}
+
 static struct index *
 sysview_space_create_index(struct space *space, struct index_def *def)
 {
@@ -448,6 +456,11 @@ sysview_space_create_index(struct space *space, struct index_def *def)
 		source_index_id = def->iid;
 		filter = vsequence_filter;
 		break;
+	case BOX_VCOLLATION_ID:
+		source_space_id = BOX_COLLATION_ID;
+		source_index_id = def->iid;
+		filter = vcollation_filter;
+		break;
 	default:
 		diag_set(ClientError, ER_MODIFY_INDEX,
 			 def->name, space_name(space),

test/app-tap/tarantoolctl.test.lua

@@ -405,8 +405,8 @@ do
             check_ctlcat_xlog(test_i, dir, "--from=3 --to=6 --format=json --show-system --replica 1", "\n", 3)
             check_ctlcat_xlog(test_i, dir, "--from=3 --to=6 --format=json --show-system --replica 1 --replica 2", "\n", 3)
             check_ctlcat_xlog(test_i, dir, "--from=3 --to=6 --format=json --show-system --replica 2", "\n", 0)
-            check_ctlcat_snap(test_i, dir, "--space=280", "---\n", 22)
-            check_ctlcat_snap(test_i, dir, "--space=288", "---\n", 48)
+            check_ctlcat_snap(test_i, dir, "--space=280", "---\n", 23)
+            check_ctlcat_snap(test_i, dir, "--space=288", "---\n", 50)
         end)
     end)
 

test/box-py/bootstrap.result

@@ -21,6 +21,10 @@ box.space._space:select{}
         'name': 'name', 'type': 'string'}, {'name': 'owner', 'type': 'unsigned'},
       {'name': 'type', 'type': 'string'}, {'name': 'locale', 'type': 'string'}, {
         'name': 'opts', 'type': 'map'}]]
+  - [277, 1, '_vcollation', 'sysview', 0, {}, [{'name': 'id', 'type': 'unsigned'},
+      {'name': 'name', 'type': 'string'}, {'name': 'owner', 'type': 'unsigned'}, {
+        'name': 'type', 'type': 'string'}, {'name': 'locale', 'type': 'string'}, {
+        'name': 'opts', 'type': 'map'}]]
   - [280, 1, '_space', 'memtx', 0, {}, [{'name': 'id', 'type': 'unsigned'}, {'name': 'owner',
         'type': 'unsigned'}, {'name': 'name', 'type': 'string'}, {'name': 'engine',
         'type': 'string'}, {'name': 'field_count', 'type': 'unsigned'}, {'name': 'flags',
@@ -88,6 +92,8 @@ box.space._index:select{}
 - - [272, 0, 'primary', 'tree', {'unique': true}, [[0, 'string']]]
   - [276, 0, 'primary', 'tree', {'unique': true}, [[0, 'unsigned']]]
   - [276, 1, 'name', 'tree', {'unique': true}, [[1, 'string']]]
+  - [277, 0, 'primary', 'tree', {'unique': true}, [[0, 'unsigned']]]
+  - [277, 1, 'name', 'tree', {'unique': true}, [[1, 'string']]]
   - [280, 0, 'primary', 'tree', {'unique': true}, [[0, 'unsigned']]]
   - [280, 1, 'owner', 'tree', {'unique': false}, [[1, 'unsigned']]]
   - [280, 2, 'name', 'tree', {'unique': true}, [[2, 'string']]]
@@ -155,6 +161,7 @@ box.space._priv:select{}
   - [1, 1, 'universe', 0, 4294967295]
   - [1, 2, 'function', 1, 4]
   - [1, 2, 'space', 276, 2]
+  - [1, 2, 'space', 277, 1]
   - [1, 2, 'space', 281, 1]
   - [1, 2, 'space', 286, 1]
   - [1, 2, 'space', 289, 1]

test/box/access_misc.result

@@ -761,6 +761,10 @@ box.space._space:select()
         'name': 'name', 'type': 'string'}, {'name': 'owner', 'type': 'unsigned'},
       {'name': 'type', 'type': 'string'}, {'name': 'locale', 'type': 'string'}, {
         'name': 'opts', 'type': 'map'}]]
+  - [277, 1, '_vcollation', 'sysview', 0, {}, [{'name': 'id', 'type': 'unsigned'},
+      {'name': 'name', 'type': 'string'}, {'name': 'owner', 'type': 'unsigned'}, {
+        'name': 'type', 'type': 'string'}, {'name': 'locale', 'type': 'string'}, {
+        'name': 'opts', 'type': 'map'}]]
   - [280, 1, '_space', 'memtx', 0, {}, [{'name': 'id', 'type': 'unsigned'}, {'name': 'owner',
         'type': 'unsigned'}, {'name': 'name', 'type': 'string'}, {'name': 'engine',
         'type': 'string'}, {'name': 'field_count', 'type': 'unsigned'}, {'name': 'flags',

test/box/access_sysview.result

@@ -74,6 +74,10 @@ session.su('guest')
 ---
 - true
 ...
+#box.space._vspace.index[2]:select('_vcollation') ~= 0
+---
+- true
+...
 #box.space._vindex:select(box.space._vspace.id) > 0
 ---
 - true
@@ -94,6 +98,10 @@ session.su('guest')
 ---
 - true
 ...
+#box.space._vindex:select(box.space._vcollation.id) > 0
+---
+- true
+...
 box.session.su('admin')
 ---
 ...
@@ -127,6 +135,10 @@ box.session.su('guest')
 ---
 - error: Read access to space '_vsequence' is denied for user 'guest'
 ...
+#box.space._vcollation:select{}
+---
+- error: Read access to space '_vcollation' is denied for user 'guest'
+...
 box.session.su('admin')
 ---
 ...
@@ -138,11 +150,15 @@ box.session.su('guest')
 ...
 #box.space._vspace:select{}
 ---
-- 8
+- 9
 ...
 #box.space._vindex:select{}
 ---
-- 20
+- 22
+...
+#box.space._vcollation:select{}
+---
+- 277
 ...
 box.session.su('admin')
 ---
@@ -230,24 +246,28 @@ box.session.su('guest')
 ...
 #box.space._vspace:select{}
 ---
-- 23
+- 24
 ...
 #box.space._vindex:select{}
 ---
-- 49
+- 51
 ...
 #box.space._vuser:select{}
 ---
 - 5
 ...
 #box.space._vpriv:select{}
 ---
-- 15
+- 16
 ...
 #box.space._vfunc:select{}
 ---
 - 1
 ...
+#box.space._vcollation:select{}
+---
+- 277
+...
 box.session.su('admin')
 ---
 ...
@@ -262,15 +282,15 @@ box.session.su('guest')
 ...
 #box.space._vindex:select{}
 ---
-- 49
+- 51
 ...
 #box.space._vuser:select{}
 ---
 - 5
 ...
 #box.space._vpriv:select{}
 ---
-- 15
+- 16
 ...
 #box.space._vfunc:select{}
 ---
@@ -280,6 +300,10 @@ box.session.su('guest')
 ---
 - 0
 ...
+#box.space._vcollation:select{}
+---
+- 277
+...
 box.session.su('admin')
 ---
 ...
@@ -631,6 +655,60 @@ seq:drop()
 ---
 ...
 --
+-- _vcollation
+--
+box.session.su('admin')
+---
+...
+box.internal.collation.create('test', 'ICU', 'ru-RU')
+---
+...
+-- Only admin can create collation.
+coll_cnt = #box.space._collation:select{}
+---
+...
+box.schema.user.grant("guest", "read, write, alter, execute", "space", "_collation")
+---
+...
+box.session.su("guest")
+---
+...
+box.internal.collation.create('guest0', 'ICU', 'ru-RU')
+---
+- error: Create access to collation 'guest0' is denied for user 'guest'
+...
+box.space._vcollation:select{0}
+---
+- - [0, 'none', 1, 'BINARY', '', {}]
+...
+#box.space._vcollation:select{} == coll_cnt
+---
+- true
+...
+box.session.su('admin')
+---
+...
+-- _vcollation is readable anyway.
+box.schema.user.revoke("guest", "read", "space", "_collation")
+---
+...
+box.session.su("guest")
+---
+...
+#box.space._vcollation:select{}
+---
+- 278
+...
+session.su('admin')
+---
+...
+box.internal.collation.drop('test')
+---
+...
+box.internal.collation.drop('guest0')
+---
+...
+--
 -- view:alter() tests
 --
 box.space._vspace.index[1]:alter({parts = { 2, 'string' }})

test/box/access_sysview.test.lua

@@ -31,12 +31,14 @@ session.su('guest')
 #box.space._vspace.index[2]:select('_vuser') ~= 0
 #box.space._vspace.index[2]:select('_vfunc') ~= 0
 #box.space._vspace.index[2]:select('_vpriv') ~= 0
+#box.space._vspace.index[2]:select('_vcollation') ~= 0
 
 #box.space._vindex:select(box.space._vspace.id) > 0
 #box.space._vindex:select(box.space._vindex.id) > 0
 #box.space._vindex:select(box.space._vuser.id) > 0
 #box.space._vindex:select(box.space._vfunc.id) > 0
 #box.space._vindex:select(box.space._vpriv.id) > 0
+#box.space._vindex:select(box.space._vcollation.id) > 0
 
 box.session.su('admin')
 box.schema.user.revoke('guest', 'public')
@@ -48,13 +50,15 @@ box.session.su('guest')
 #box.space._vpriv:select{}
 #box.space._vfunc:select{}
 #box.space._vsequence:select{}
+#box.space._vcollation:select{}
 
 box.session.su('admin')
 box.schema.user.grant('guest', 'public')
 box.session.su('guest')
 
 #box.space._vspace:select{}
 #box.space._vindex:select{}
+#box.space._vcollation:select{}
 
 box.session.su('admin')
 s = box.schema.space.create('test')
@@ -96,6 +100,7 @@ box.session.su('guest')
 #box.space._vuser:select{}
 #box.space._vpriv:select{}
 #box.space._vfunc:select{}
+#box.space._vcollation:select{}
 
 box.session.su('admin')
 box.schema.user.revoke('guest', 'read', 'universe')
@@ -107,6 +112,7 @@ box.session.su('guest')
 #box.space._vpriv:select{}
 #box.space._vfunc:select{}
 #box.space._vsequence:select{}
+#box.space._vcollation:select{}
 
 box.session.su('admin')
 box.schema.user.revoke('guest', 'write', 'universe')
@@ -264,6 +270,30 @@ box.session.su("guest")
 session.su('admin')
 seq:drop()
 
+--
+-- _vcollation
+--
+
+box.session.su('admin')
+box.internal.collation.create('test', 'ICU', 'ru-RU')
+
+-- Only admin can create collation.
+coll_cnt = #box.space._collation:select{}
+box.schema.user.grant("guest", "read, write, alter, execute", "space", "_collation")
+box.session.su("guest")
+box.internal.collation.create('guest0', 'ICU', 'ru-RU')
+box.space._vcollation:select{0}
+#box.space._vcollation:select{} == coll_cnt
+box.session.su('admin')
+
+-- _vcollation is readable anyway.
+box.schema.user.revoke("guest", "read", "space", "_collation")
+box.session.su("guest")
+#box.space._vcollation:select{}
+session.su('admin')
+box.internal.collation.drop('test')
+box.internal.collation.drop('guest0')
+
 --
 -- view:alter() tests
 --

test/box/alter.result

@@ -169,6 +169,8 @@ _index:select{}
 - - [272, 0, 'primary', 'tree', {'unique': true}, [[0, 'string']]]
   - [276, 0, 'primary', 'tree', {'unique': true}, [[0, 'unsigned']]]
   - [276, 1, 'name', 'tree', {'unique': true}, [[1, 'string']]]
+  - [277, 0, 'primary', 'tree', {'unique': true}, [[0, 'unsigned']]]
+  - [277, 1, 'name', 'tree', {'unique': true}, [[1, 'string']]]
   - [280, 0, 'primary', 'tree', {'unique': true}, [[0, 'unsigned']]]
   - [280, 1, 'owner', 'tree', {'unique': false}, [[1, 'unsigned']]]
   - [280, 2, 'name', 'tree', {'unique': true}, [[2, 'string']]]

test/wal_off/alter.result

@@ -28,7 +28,7 @@ end;
 ...
 #spaces;
 ---
-- 65504
+- 65503
 ...
 -- cleanup
 for k, v in pairs(spaces) do