CREATE OR REPLACE FUNCTION text_equals(text, text)
RETURNS boolean AS $$
BEGIN RAISE NOTICE 'Comparing two texts'; RETURN $1 = $2;
END;
$$ LANGUAGE plpgsql;
2. If a function has Raise notice but extracting current user inside notice, although its output purely depends on its input arguments eg.
CREATE OR REPLACE FUNCTION text_equals(text, text)
RETURNS boolean AS $$
BEGIN RAISE NOTICE 'Current user: %', current_user; RETURN $1 = $2;
END;
$$ LANGUAGE plpgsql;
On security definer part I am confused with the below example
set role postgres;
CREATE OR REPLACE FUNCTION outer_function()
RETURNS TEXT AS $$
DECLARE
user_text TEXT;
BEGIN
SELECT 'OuterFunction() -> Current user is ' || current_user INTO user_text;
user_text := user_text || ' | ' || inner_function();
RETURN user_text;
END;
$$ LANGUAGE plpgsql VOLATILE SECURITY DEFINER;
create role test;
create role alex;
grant create on schema public to test;
set role test;
CREATE OR REPLACE FUNCTION inner_function()
RETURNS TEXT AS $$
DECLARE
current_user_text TEXT;
BEGIN
current_user_text := 'InnerFunction() -> Current user is ' || current_user;
RETURN current_user_text;
END;
$$ LANGUAGE plpgsql VOLATILE SECURITY INVOKER;
set role alex;
select outer_function();
outer_function
-------------------------------------------------------------------------------------------
OuterFunction() -> Current user is postgres | InnerFunction() -> Current user is postgres
Shouldn't it be "InnerFunction() -> Current user is alex" instead of postgres as alex called the security invoker function
I tried reading docs but couldn't get any satisfactory answers, it will be helpful if someone helped me out here
Thanks,
Ayush Vatsa
SDE AWS