Merge pull request ceph#45810 from zenomri/wip-rgw-lua-bucketname

rgw: support bucket name in lua pre request execution

Author: yuvalif

doc/radosgw/lua-scripting.rst

@@ -140,27 +140,27 @@ Request Fields
 +----------------------------------------------------+----------+--------------------------------------------------------------+----------+-----------+----------+
 | ``Request.SwiftAccountName``                       | string   | swift account name                                           | no       | no        | yes      |
 +----------------------------------------------------+----------+--------------------------------------------------------------+----------+-----------+----------+
-| ``Request.Bucket``                                 | table    | info on the bucket                                           | no       | no        | yes      |
+| ``Request.Bucket``                                 | table    | info on the bucket                                           | no       | no        | no       |
 +----------------------------------------------------+----------+--------------------------------------------------------------+----------+-----------+----------+
-| ``Request.Bucket.Tenant``                          | string   | tenant of the bucket                                         | no       | no        | no       |
+| ``Request.Bucket.Tenant``                          | string   | tenant of the bucket                                         | no       | no        | yes      |
 +----------------------------------------------------+----------+--------------------------------------------------------------+----------+-----------+----------+
 | ``Request.Bucket.Name``                            | string   | bucket name                                                  | no       | no        | no       |
 +----------------------------------------------------+----------+--------------------------------------------------------------+----------+-----------+----------+
-| ``Request.Bucket.Marker``                          | string   | bucket marker (initial id)                                   | no       | no        | no       |
+| ``Request.Bucket.Marker``                          | string   | bucket marker (initial id)                                   | no       | no        | yes      |
 +----------------------------------------------------+----------+--------------------------------------------------------------+----------+-----------+----------+
-| ``Request.Bucket.Id``                              | string   | bucket id                                                    | no       | no        | no       |
+| ``Request.Bucket.Id``                              | string   | bucket id                                                    | no       | no        | yes      |
 +----------------------------------------------------+----------+--------------------------------------------------------------+----------+-----------+----------+
-| ``Request.Bucket.Count``                           | integer  | number of objects in the bucket                              | no       | no        | no       |
+| ``Request.Bucket.Count``                           | integer  | number of objects in the bucket                              | no       | no        | yes      |
 +----------------------------------------------------+----------+--------------------------------------------------------------+----------+-----------+----------+
-| ``Request.Bucket.Size``                            | integer  | total size of objects in the bucket                          | no       | no        | no       |
+| ``Request.Bucket.Size``                            | integer  | total size of objects in the bucket                          | no       | no        | yes      |
 +----------------------------------------------------+----------+--------------------------------------------------------------+----------+-----------+----------+
-| ``Request.Bucket.ZoneGroupId``                     | string   | zone group of the bucket                                     | no       | no        | no       |
+| ``Request.Bucket.ZoneGroupId``                     | string   | zone group of the bucket                                     | no       | no        | yes      |
 +----------------------------------------------------+----------+--------------------------------------------------------------+----------+-----------+----------+
-| ``Request.Bucket.CreationTime``                    | time     | creation time of the bucket                                  | no       | no        | no       |
+| ``Request.Bucket.CreationTime``                    | time     | creation time of the bucket                                  | no       | no        | yes      |
 +----------------------------------------------------+----------+--------------------------------------------------------------+----------+-----------+----------+
-| ``Request.Bucket.MTime``                           | time     | modification time of the bucket                              | no       | no        | no       |
+| ``Request.Bucket.MTime``                           | time     | modification time of the bucket                              | no       | no        | yes      |
 +----------------------------------------------------+----------+--------------------------------------------------------------+----------+-----------+----------+
-| ``Request.Bucket.Quota``                           | table    | bucket quota                                                 | no       | no        | no       |
+| ``Request.Bucket.Quota``                           | table    | bucket quota                                                 | no       | no        | yes      |
 +----------------------------------------------------+----------+--------------------------------------------------------------+----------+-----------+----------+
 | ``Request.Bucket.Quota.MaxSize``                   | integer  | bucket quota max size                                        | no       | no        | no       |
 +----------------------------------------------------+----------+--------------------------------------------------------------+----------+-----------+----------+
@@ -170,13 +170,13 @@ Request Fields
 +----------------------------------------------------+----------+--------------------------------------------------------------+----------+-----------+----------+
 | ``Request.Bucket.Quota.Rounded``                   | boolean  | bucket quota is rounded to 4K                                | no       | no        | no       |
 +----------------------------------------------------+----------+--------------------------------------------------------------+----------+-----------+----------+
-| ``Request.Bucket.PlacementRule``                   | table    | bucket placement rule                                        | no       | no        | no       |
+| ``Request.Bucket.PlacementRule``                   | table    | bucket placement rule                                        | no       | no        | yes      |
 +----------------------------------------------------+----------+--------------------------------------------------------------+----------+-----------+----------+
 | ``Request.Bucket.PlacementRule.Name``              | string   | bucket placement rule name                                   | no       | no        | no       |
 +----------------------------------------------------+----------+--------------------------------------------------------------+----------+-----------+----------+
 | ``Request.Bucket.PlacementRule.StorageClass``      | string   | bucket placement rule storage class                          | no       | no        | no       |
 +----------------------------------------------------+----------+--------------------------------------------------------------+----------+-----------+----------+
-| ``Request.Bucket.User``                            | table    | bucket owner                                                 | no       | no        | no       |
+| ``Request.Bucket.User``                            | table    | bucket owner                                                 | no       | no        | yes      |
 +----------------------------------------------------+----------+--------------------------------------------------------------+----------+-----------+----------+
 | ``Request.Bucket.User.Tenant``                     | string   | bucket owner tenant                                          | no       | no        | no       |
 +----------------------------------------------------+----------+--------------------------------------------------------------+----------+-----------+----------+

src/rgw/rgw_lua_request.cc

@@ -170,14 +170,19 @@ struct BucketMetaTable : public EmptyMetaTable {
   static std::string TableName() {return "Bucket";}
   static std::string Name() {return TableName() + "Meta";}
 
-  using Type = rgw::sal::Bucket;
-
   static int IndexClosure(lua_State* L) {
-    const auto bucket = reinterpret_cast<Type*>(lua_touserdata(L, lua_upvalueindex(1)));
+    const auto s = reinterpret_cast<req_state*>(lua_touserdata(L, lua_upvalueindex(1)));
+    const auto bucket = s->bucket.get();
 
     const char* index = luaL_checkstring(L, 2);
 
-    if (strcasecmp(index, "Tenant") == 0) {
+    if (rgw::sal::Bucket::empty(bucket)) {
+      if (strcasecmp(index, "Name") == 0) {
+        pushstring(L, s->init_state.url_bucket);
+      } else {
+        lua_pushnil(L);
+      }
+    } else if (strcasecmp(index, "Tenant") == 0) {
       pushstring(L, bucket->get_tenant());
     } else if (strcasecmp(index, "Name") == 0) {
       pushstring(L, bucket->get_name());
@@ -731,7 +736,7 @@ struct RequestMetaTable : public EmptyMetaTable {
         lua_pushnil(L);
       }
     } else if (strcasecmp(index, "Bucket") == 0) {
-      create_metatable<BucketMetaTable>(L, false, s->bucket);
+      create_metatable<BucketMetaTable>(L, false, s);
     } else if (strcasecmp(index, "Object") == 0) {
       create_metatable<ObjectMetaTable>(L, false, s->object);
     } else if (strcasecmp(index, "CopyFrom") == 0) {