davisp commented on a change in pull request #2666: soft-deletion for database
URL: https://github.com/apache/couchdb/pull/2666#discussion_r401804248
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File path: src/fabric/src/fabric2_fdb.erl
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@@ -365,6 +364,65 @@ exists(#{name := DbName} = Db) when is_binary(DbName) ->
end.
+undelete(#{} = Db0, TgtDbName, TimeStamp) ->
+ #{
+ name := DbName,
+ tx := Tx,
+ layer_prefix := LayerPrefix
+ } = ensure_current(Db0, false),
+ DbKey = erlfdb_tuple:pack({?ALL_DBS, TgtDbName}, LayerPrefix),
+ case erlfdb:wait(erlfdb:get(Tx, DbKey)) of
+ Bin when is_binary(Bin) ->
+ file_exists;
+ not_found ->
+ DeletedDbTupleKey = {
+ ?DELETED_DBS,
+ DbName,
+ TimeStamp
+ },
+ DeleteDbKey = erlfdb_tuple:pack(DeletedDbTupleKey, LayerPrefix),
+ case erlfdb:wait(erlfdb:get(Tx, DeleteDbKey)) of
+ not_found ->
+ erlang:error({not_found});
+ DbPrefix ->
+ erlfdb:set(Tx, DbKey, DbPrefix),
+ erlfdb:clear(Tx, DeleteDbKey),
+ bump_db_version(#{
+ tx => Tx,
+ db_prefix => DbPrefix
+ }),
+ ok
+ end
+ end.
+
+
+remove_deleted_db(#{} = Db0, TimeStamp) ->
+ #{
+ name := DbName,
+ tx := Tx,
+ layer_prefix := LayerPrefix
+ } = ensure_current(Db0, false),
+
+ DeletedDbTupleKey = {
+ ?DELETED_DBS,
+ DbName,
+ TimeStamp
+ },
+ DeletedDbKey = erlfdb_tuple:pack(DeletedDbTupleKey, LayerPrefix),
+ case erlfdb:wait(erlfdb:get(Tx, DeletedDbKey)) of
+ not_found ->
+ erlang:error({not_found});
Review comment:
Whatever we pick in undelete should be mirrored in this function as well.
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