Add stats item for Upload Part Copy

Author: Shunichi Shinohara

src/riak_cs_stats.erl

@@ -77,11 +77,12 @@ duration_metrics() ->
          [object_acl, get],
          [object_acl, put],
 
-         [multipart, post],          % Initiate
-         [multipart_upload, put],    % Upload Part (Copy)
-         [multipart_upload, post],   % Complete
-         [multipart_upload, delete], % Abort
-         [multipart_upload, get],    % List Parts
+         [multipart, post],            % Initiate
+         [multipart_upload, put],      % Upload Part
+         [multipart_upload, put_copy], % Upload Part (Copy)
+         [multipart_upload, post],     % Complete
+         [multipart_upload, delete],   % Abort
+         [multipart_upload, get],      % List Parts
 
          [velvet, create_user],
          [velvet, update_user],

src/riak_cs_wm_object_upload_part.erl

@@ -239,7 +239,8 @@ validate_copy_header(RD, #context{response_module=ResponseMod,
                         ResponseMod:api_error(no_copy_source_key, RD, Ctx);
                     {ok, SrcManifest} ->
                         {Start,End} = riak_cs_copy_object:copy_range(RD, SrcManifest),
-                        validate_part_size(RD, Ctx,
+                        validate_part_size(RD,
+                                           Ctx#context{stats_key=[multipart_upload, put_copy]},
                                            End - Start + 1,
                                            SrcManifest, ReadRcPid)
                 end