box.space._func

box.space._func

_func is a system space with function tuples made by box.schema.func.create().

Tuples in this space contain the following fields:

• the numeric function id, a number,
• the function name,
• flag,
• a language name (optional): ‘LUA’ (default) or ‘C’.

The _func space does not include the function’s body. You continue to create Lua functions in the usual way, by saying function function_name () ... end, without adding anything in the _func space. The _func space only exists for storing function tuples so that their names can be used within grant/revoke functions.

You can:

• Create a _func tuple with box.schema.func.create(),
• Drop a _func tuple with box.schema.func.drop(),
• Check whether a _func tuple exists with box.schema.func.exists().

Example:

In the following example, we create a function named ‘f7’, put it into Tarantool’s _func space and grant ‘execute’ privilege for this function to ‘guest’ user.

tarantool> function f7()
         >  box.session.uid()
         > end
---
...
tarantool> box.schema.func.create('f7')
---
...
tarantool> box.schema.user.grant('guest', 'execute', 'function', 'f7')
---
...
tarantool> box.schema.user.revoke('guest', 'execute', 'function', 'f7')
---
...