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create or replace function pgq.current_event_table(x_queue_name text)
returns text as $$
-- ----------------------------------------------------------------------
-- Function: pgq.current_event_table(1)
--
-- Return active event table for particular queue.
-- Event can be added to it without going via functions,
-- e.g. by COPY.
--
-- If queue is disabled and GUC session_replication_role <> 'replica'
-- then raises exception.
--
-- or expressed in a different way - an even table of a disabled queue
-- is returned only on replica
--
-- Note:
-- The result is valid only during current transaction.
--
-- Permissions:
-- Actual insertion requires superuser access.
--
-- Parameters:
-- x_queue_name - Queue name.
-- ----------------------------------------------------------------------
declare
res text;
disabled boolean;
begin
select queue_data_pfx || '_' || queue_cur_table::text,
queue_disable_insert
into res, disabled
from pgq.queue where queue_name = x_queue_name;
if not found then
raise exception 'Event queue not found';
end if;
if disabled then
if current_setting('session_replication_role') <> 'replica' then
raise exception 'Writing to queue disabled';
end if;
end if;
return res;
end;
$$ language plpgsql; -- no perms needed
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