/usr/share/postgresql/9.4/extension/londiste--3.1.1--3.2.sql is in postgresql-9.4-pgq3 3.2-2.
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-- upgrade schema
create or replace function londiste.upgrade_schema()
returns int4 as $$
-- updates table structure if necessary
declare
pgversion int;
cnt int4 = 0;
begin
show server_version_num into pgversion;
-- table_info: check (dropped_ddl is null or merge_state in ('in-copy', 'catching-up'))
perform 1 from information_schema.check_constraints
where constraint_schema = 'londiste'
and constraint_name = 'table_info_check'
and position('in-copy' in check_clause) > 0
and position('catching' in check_clause) = 0;
if found then
alter table londiste.table_info drop constraint table_info_check;
alter table londiste.table_info add constraint table_info_check
check (dropped_ddl is null or merge_state in ('in-copy', 'catching-up'));
cnt := cnt + 1;
end if;
-- table_info.dest_table
perform 1 from information_schema.columns
where table_schema = 'londiste'
and table_name = 'table_info'
and column_name = 'dest_table';
if not found then
alter table londiste.table_info add column dest_table text;
end if;
-- table_info: change trigger timing
if pgversion >= 90100 then
perform 1 from information_schema.triggers
where event_object_schema = 'londiste'
and event_object_table = 'table_info'
and trigger_name = 'table_info_trigger_sync'
and action_timing = 'AFTER';
else
perform 1 from information_schema.triggers
where event_object_schema = 'londiste'
and event_object_table = 'table_info'
and trigger_name = 'table_info_trigger_sync'
and condition_timing = 'AFTER';
end if;
if found then
drop trigger table_info_trigger_sync on londiste.table_info;
create trigger table_info_trigger_sync before delete on londiste.table_info
for each row execute procedure londiste.table_info_trigger();
end if;
-- applied_execute.dest_table
perform 1 from information_schema.columns
where table_schema = 'londiste'
and table_name = 'applied_execute'
and column_name = 'execute_attrs';
if not found then
alter table londiste.applied_execute add column execute_attrs text;
end if;
-- applied_execute: drop queue_name from primary key
perform 1 from pg_catalog.pg_indexes
where schemaname = 'londiste'
and tablename = 'applied_execute'
and indexname = 'applied_execute_pkey'
and indexdef like '%queue_name%';
if found then
alter table londiste.applied_execute
drop constraint applied_execute_pkey;
alter table londiste.applied_execute
add constraint applied_execute_pkey
primary key (execute_file);
end if;
-- applied_execute: drop fkey to pgq_node
perform 1 from information_schema.table_constraints
where constraint_schema = 'londiste'
and table_schema = 'londiste'
and table_name = 'applied_execute'
and constraint_type = 'FOREIGN KEY'
and constraint_name = 'applied_execute_queue_name_fkey';
if found then
alter table londiste.applied_execute
drop constraint applied_execute_queue_name_fkey;
end if;
-- create roles
perform 1 from pg_catalog.pg_roles where rolname = 'londiste_writer';
if not found then
create role londiste_writer in role pgq_admin;
cnt := cnt + 1;
end if;
perform 1 from pg_catalog.pg_roles where rolname = 'londiste_reader';
if not found then
create role londiste_reader in role pgq_reader;
cnt := cnt + 1;
end if;
return cnt;
end;
$$ language plpgsql;
select londiste.upgrade_schema();
-- Group: Information
create or replace function londiste.get_seq_list(
in i_queue_name text,
out seq_name text,
out last_value int8,
out local boolean)
returns setof record as $$
-- ----------------------------------------------------------------------
-- Function: londiste.get_seq_list(1)
--
-- Returns registered seqs on this Londiste node.
--
-- Result fiels:
-- seq_name - fully qualified name of sequence
-- last_value - last globally published value
-- local - is locally registered
-- ----------------------------------------------------------------------
declare
rec record;
begin
for seq_name, last_value, local in
select s.seq_name, s.last_value, s.local from londiste.seq_info s
where s.queue_name = i_queue_name
order by s.nr, s.seq_name
loop
return next;
end loop;
return;
end;
$$ language plpgsql strict;
drop function if exists londiste.get_table_list(text);
create or replace function londiste.get_table_list(
in i_queue_name text,
out table_name text,
out local boolean,
out merge_state text,
out custom_snapshot text,
out table_attrs text,
out dropped_ddl text,
out copy_role text,
out copy_pos int4,
out dest_table text)
returns setof record as $$
-- ----------------------------------------------------------------------
-- Function: londiste.get_table_list(1)
--
-- Return info about registered tables.
--
-- Parameters:
-- i_queue_name - cascaded queue name
--
-- Returns:
-- table_name - fully-quelified table name
-- local - does events needs to be applied to local table
-- merge_state - show phase of initial copy
-- custom_snapshot - remote snapshot of COPY transaction
-- table_attrs - urlencoded dict of table attributes
-- dropped_ddl - partition combining: temp place to put DDL
-- copy_role - partition combining: how to handle copy
-- copy_pos - position in parallel copy working order
--
-- copy_role = lead:
-- on copy start, drop indexes and store in dropped_ddl
-- on copy finish change state to catching-up, then wait until copy_role turns to NULL
-- catching-up: if dropped_ddl not NULL, restore them
-- copy_role = wait-copy:
-- on copy start wait, until role changes (to wait-replay)
-- copy_role = wait-replay:
-- on copy finish, tag as 'catching-up'
-- wait until copy_role is NULL, then proceed
-- ----------------------------------------------------------------------
begin
for table_name, local, merge_state, custom_snapshot, table_attrs,
dropped_ddl, dest_table
in
select t.table_name, t.local, t.merge_state, t.custom_snapshot, t.table_attrs,
t.dropped_ddl, t.dest_table
from londiste.table_info t
where t.queue_name = i_queue_name
order by t.nr, t.table_name
loop
copy_role := null;
copy_pos := 0;
if merge_state in ('in-copy', 'catching-up') then
select f.copy_role, f.copy_pos
from londiste._coordinate_copy(i_queue_name, table_name) f
into copy_role, copy_pos;
end if;
return next;
end loop;
return;
end;
$$ language plpgsql strict stable;
create or replace function londiste._coordinate_copy(
in i_queue_name text, in i_table_name text,
out copy_role text, out copy_pos int4)
as $$
-- if the table is in middle of copy from multiple partitions,
-- the copy processes need coordination.
declare
q_part1 text;
q_part_ddl text;
n_parts int4;
n_done int4;
_table_name text;
n_combined_queue text;
merge_state text;
dest_table text;
dropped_ddl text;
begin
copy_pos := 0;
copy_role := null;
select t.merge_state, t.dest_table, t.dropped_ddl,
min(case when t2.local then t2.queue_name else null end) as _queue1,
min(case when t2.local and t2.dropped_ddl is not null then t2.queue_name else null end) as _queue1ddl,
count(case when t2.local then t2.table_name else null end) as _total,
count(case when t2.local then nullif(t2.merge_state, 'in-copy') else null end) as _done,
min(n.combined_queue) as _combined_queue,
count(nullif(t2.queue_name < i_queue_name and t.merge_state = 'in-copy' and t2.merge_state = 'in-copy', false)) as _copy_pos
from londiste.table_info t
join pgq_node.node_info n on (n.queue_name = t.queue_name)
left join pgq_node.node_info n2 on (n2.combined_queue = n.combined_queue or
(n2.combined_queue is null and n.combined_queue is null))
left join londiste.table_info t2 on
(coalesce(t2.dest_table, t2.table_name) = coalesce(t.dest_table, t.table_name) and
t2.queue_name = n2.queue_name and
(t2.merge_state is null or t2.merge_state != 'ok'))
where t.queue_name = i_queue_name and t.table_name = i_table_name
group by t.nr, t.table_name, t.local, t.merge_state, t.custom_snapshot, t.table_attrs, t.dropped_ddl, t.dest_table
into merge_state, dest_table, dropped_ddl, q_part1, q_part_ddl, n_parts, n_done, n_combined_queue, copy_pos;
-- q_part1, q_part_ddl, n_parts, n_done, n_combined_queue, copy_pos, dest_table
-- be more robust against late joiners
q_part1 := coalesce(q_part_ddl, q_part1);
-- turn the logic off if no merge is happening
if n_parts = 1 then
q_part1 := null;
end if;
if q_part1 is not null then
if i_queue_name = q_part1 then
-- lead
if merge_state = 'in-copy' then
if dropped_ddl is null and n_done > 0 then
-- seems late addition, let it copy with indexes
copy_role := 'wait-replay';
elsif n_done < n_parts then
-- show copy_role only if need to drop ddl or already did drop ddl
copy_role := 'lead';
end if;
-- make sure it cannot be made to wait
copy_pos := 0;
end if;
if merge_state = 'catching-up' and dropped_ddl is not null then
-- show copy_role only if need to wait for others
if n_done < n_parts then
copy_role := 'wait-replay';
end if;
end if;
else
-- follow
if merge_state = 'in-copy' then
if q_part_ddl is not null then
-- can copy, wait in replay until lead has applied ddl
copy_role := 'wait-replay';
elsif n_done > 0 then
-- ddl is not dropped, others are active, copy without touching ddl
copy_role := 'wait-replay';
else
-- wait for lead to drop ddl
copy_role := 'wait-copy';
end if;
elsif merge_state = 'catching-up' then
-- show copy_role only if need to wait for lead
if q_part_ddl is not null then
copy_role := 'wait-replay';
end if;
end if;
end if;
end if;
return;
end;
$$ language plpgsql strict stable;
create or replace function londiste.local_show_missing(
in i_queue_name text,
out obj_kind text, out obj_name text)
returns setof record as $$
-- ----------------------------------------------------------------------
-- Function: londiste.local_show_missing(1)
--
-- Return info about missing tables. On root show tables
-- not registered on set, on branch/leaf show tables
-- in set but not registered locally.
-- ----------------------------------------------------------------------
begin
if pgq_node.is_root_node(i_queue_name) then
for obj_kind, obj_name in
select r.relkind, n.nspname || '.' || r.relname
from pg_catalog.pg_class r, pg_catalog.pg_namespace n
where n.oid = r.relnamespace
and r.relkind in ('r', 'S')
and n.nspname not in ('pgq', 'pgq_ext', 'pgq_node', 'londiste', 'pg_catalog', 'information_schema')
and n.nspname !~ '^pg_(toast|temp)'
and not exists (select 1 from londiste.table_info
where queue_name = i_queue_name and local
and coalesce(dest_table, table_name) = (n.nspname || '.' || r.relname))
order by 1, 2
loop
return next;
end loop;
else
for obj_kind, obj_name in
select 'S', s.seq_name from londiste.seq_info s
where s.queue_name = i_queue_name
and not s.local
union all
select 'r', t.table_name from londiste.table_info t
where t.queue_name = i_queue_name
and not t.local
order by 1, 2
loop
return next;
end loop;
end if;
return;
end;
$$ language plpgsql strict stable;
-- Group: Local object registration (setup tool)
create or replace function londiste.local_add_seq(
in i_queue_name text, in i_seq_name text,
out ret_code int4, out ret_note text)
as $$
-- ----------------------------------------------------------------------
-- Function: londiste.local_add_seq(2)
--
-- Register sequence.
--
-- Parameters:
-- i_queue_name - cascaded queue name
-- i_seq_name - seq name
--
-- Returns:
-- 200 - OK
-- 400 - Not found
-- ----------------------------------------------------------------------
declare
fq_seq_name text;
lastval int8;
seq record;
begin
fq_seq_name := londiste.make_fqname(i_seq_name);
perform 1 from pg_class
where oid = londiste.find_seq_oid(fq_seq_name);
if not found then
select 400, 'Sequence not found: ' || fq_seq_name into ret_code, ret_note;
return;
end if;
if pgq_node.is_root_node(i_queue_name) then
select local, last_value into seq
from londiste.seq_info
where queue_name = i_queue_name
and seq_name = fq_seq_name
for update;
if found and seq.local then
select 201, 'Sequence already added: ' || fq_seq_name
into ret_code, ret_note;
return;
end if;
if not seq.local then
update londiste.seq_info set local = true
where queue_name = i_queue_name and seq_name = fq_seq_name;
else
insert into londiste.seq_info (queue_name, seq_name, local, last_value)
values (i_queue_name, fq_seq_name, true, 0);
end if;
perform * from londiste.root_check_seqs(i_queue_name);
else
select local, last_value into seq
from londiste.seq_info
where queue_name = i_queue_name
and seq_name = fq_seq_name
for update;
if not found then
select 404, 'Unknown sequence: ' || fq_seq_name
into ret_code, ret_note;
return;
end if;
if seq.local then
select 201, 'Sequence already added: ' || fq_seq_name
into ret_code, ret_note;
return;
end if;
update londiste.seq_info set local = true
where queue_name = i_queue_name and seq_name = fq_seq_name;
perform pgq.seq_setval(fq_seq_name, seq.last_value);
end if;
select 200, 'Sequence added: ' || fq_seq_name into ret_code, ret_note;
return;
end;
$$ language plpgsql;
create or replace function londiste.create_trigger(
in i_queue_name text,
in i_table_name text,
in i_trg_args text[],
in i_dest_table text,
in i_node_type text,
out ret_code int4,
out ret_note text,
out trigger_name text)
as $$
------------------------------------------------------------------------
-- Function: londiste.create_trigger(5)
--
-- Create or replace londiste trigger(s)
--
-- Parameters:
-- i_queue_name - queue name
-- i_table_name - table name
-- i_trg_args - args to trigger
-- i_dest_table - actual name of destination table (NULL if same as src)
-- i_node_type - l3 node type
--
-- Trigger args:
-- See documentation for pgq triggers.
--
-- Trigger creation flags (default: AIUDL):
-- I - ON INSERT
-- U - ON UPDATE
-- D - ON DELETE
-- Q - use pgq.sqltriga() as trigger function
-- L - use pgq.logutriga() as trigger function
-- B - BEFORE
-- A - AFTER
-- S - SKIP
--
-- Returns:
-- 200 - Ok
-- 201 - Trigger not created
-- 405 - Multiple SKIP triggers
--
------------------------------------------------------------------------
declare
trigger_name text;
lg_func text;
lg_pos text;
lg_event text;
lg_args text[];
_old_tgargs bytea;
_new_tgargs bytea;
trunctrg_name text;
pgversion int;
sql text;
arg text;
i integer;
_extra_args text[] := '{}';
-- skip trigger
_skip_prefix text := 'zzz_';
_skip_trg_count integer;
_skip_trg_name text;
-- given tgflags array
_tgflags char[];
-- ordinary argument array
_args text[];
-- array with all valid tgflags values
_valid_flags char[] := array['B','A','Q','L','I','U','D','S'];
-- argument flags
_skip boolean := false;
_no_triggers boolean := false;
_got_extra1 boolean := false;
begin
-- parse trigger args
if array_lower(i_trg_args, 1) is not null then
for i in array_lower(i_trg_args, 1) .. array_upper(i_trg_args, 1) loop
arg := i_trg_args[i];
if arg like 'tgflags=%' then
-- special flag handling
arg := upper(substr(arg, 9));
for j in array_lower(_valid_flags, 1) .. array_upper(_valid_flags, 1) loop
if position(_valid_flags[j] in arg) > 0 then
_tgflags := array_append(_tgflags, _valid_flags[j]);
end if;
end loop;
elsif arg = 'no_triggers' then
_no_triggers := true;
elsif lower(arg) = 'skip' then
_skip := true;
elsif arg = 'virtual_table' then
_no_triggers := true; -- do not create triggers
elsif arg not in ('expect_sync', 'skip_truncate', 'merge_all', 'no_merge') then -- ignore add-table args
if arg like 'ev_extra1=%' then
_got_extra1 := true;
end if;
-- ordinary arg
_args = array_append(_args, quote_literal(arg));
end if;
end loop;
end if;
if i_dest_table <> i_table_name and not _got_extra1 then
-- if renamed table, enforce trigger to put
-- global table name into extra1
arg := 'ev_extra1=' || quote_literal(i_table_name);
_args := array_append(_args, quote_literal(arg));
end if;
trigger_name := '_londiste_' || i_queue_name;
lg_func := 'pgq.logutriga';
lg_event := '';
lg_args := array[quote_literal(i_queue_name)];
lg_pos := 'after';
if array_lower(_args, 1) is not null then
lg_args := lg_args || _args;
end if;
if 'B' = any(_tgflags) then
lg_pos := 'before';
end if;
if 'A' = any(_tgflags) then
lg_pos := 'after';
end if;
if 'Q' = any(_tgflags) then
lg_func := 'pgq.sqltriga';
end if;
if 'L' = any(_tgflags) then
lg_func := 'pgq.logutriga';
end if;
if 'I' = any(_tgflags) then
lg_event := lg_event || ' or insert';
end if;
if 'U' = any(_tgflags) then
lg_event := lg_event || ' or update';
end if;
if 'D' = any(_tgflags) then
lg_event := lg_event || ' or delete';
end if;
if 'S' = any(_tgflags) then
_skip := true;
end if;
if i_node_type = 'leaf' then
-- on weird leafs the trigger funcs may not exist
perform 1 from pg_proc p join pg_namespace n on (n.oid = p.pronamespace)
where n.nspname = 'pgq' and p.proname in ('logutriga', 'sqltriga');
if not found then
select 201, 'Trigger not created' into ret_code, ret_note;
return;
end if;
-- on regular leaf, install deny trigger
_extra_args := array_append(_extra_args, quote_literal('deny'));
end if;
if _skip or lg_pos = 'after' then
-- get count and name of existing skip triggers
select count(*), min(t.tgname)
into _skip_trg_count, _skip_trg_name
from pg_catalog.pg_trigger t
where t.tgrelid = londiste.find_table_oid(i_dest_table)
and position(E'\\000SKIP\\000'::bytea in tgargs) > 0;
end if;
-- make sure new trigger won't be effectively inactive
if lg_pos = 'after' and _skip_trg_count > 0 then
select 403, 'AFTER trigger cannot work with SKIP trigger(s)'
into ret_code, ret_note;
return;
end if;
-- if skip param given, rename previous skip triggers and prefix current
if _skip then
-- if no previous skip triggers, prefix name and add SKIP to args
if _skip_trg_count = 0 then
trigger_name := _skip_prefix || trigger_name;
lg_args := array_append(lg_args, quote_literal('SKIP'));
-- if one previous skip trigger, check it's prefix and
-- do not use SKIP on current trigger
elsif _skip_trg_count = 1 then
-- if not prefixed then rename
if position(_skip_prefix in _skip_trg_name) != 1 then
sql := 'alter trigger ' || _skip_trg_name
|| ' on ' || londiste.quote_fqname(i_dest_table)
|| ' rename to ' || _skip_prefix || _skip_trg_name;
execute sql;
end if;
else
select 405, 'Multiple SKIP triggers'
into ret_code, ret_note;
return;
end if;
end if;
-- create Ins/Upd/Del trigger if it does not exists already
select t.tgargs
from pg_catalog.pg_trigger t
where t.tgrelid = londiste.find_table_oid(i_dest_table)
and t.tgname = trigger_name
into _old_tgargs;
if found then
_new_tgargs := decode(lg_args[1], 'escape');
for i in 2 .. array_upper(lg_args, 1) loop
_new_tgargs := _new_tgargs || E'\\000'::bytea || decode(lg_args[i], 'escape');
end loop;
if _old_tgargs is distinct from _new_tgargs then
sql := 'drop trigger if exists ' || quote_ident(trigger_name)
|| ' on ' || londiste.quote_fqname(i_dest_table);
execute sql;
end if;
end if;
if not found or _old_tgargs is distinct from _new_tgargs then
if _no_triggers then
select 201, 'Trigger not created'
into ret_code, ret_note;
return;
end if;
-- finalize event
lg_event := substr(lg_event, 4); -- remove ' or '
if lg_event = '' then
lg_event := 'insert or update or delete';
end if;
-- create trigger
lg_args := lg_args || _extra_args;
sql := 'create trigger ' || quote_ident(trigger_name)
|| ' ' || lg_pos || ' ' || lg_event
|| ' on ' || londiste.quote_fqname(i_dest_table)
|| ' for each row execute procedure '
|| lg_func || '(' || array_to_string(lg_args, ', ') || ')';
execute sql;
end if;
-- create truncate trigger if it does not exists already
show server_version_num into pgversion;
if pgversion >= 80400 then
trunctrg_name := '_londiste_' || i_queue_name || '_truncate';
perform 1 from pg_catalog.pg_trigger
where tgrelid = londiste.find_table_oid(i_dest_table)
and tgname = trunctrg_name;
if not found then
_extra_args := quote_literal(i_queue_name) || _extra_args;
sql := 'create trigger ' || quote_ident(trunctrg_name)
|| ' after truncate on ' || londiste.quote_fqname(i_dest_table)
|| ' for each statement execute procedure pgq.sqltriga('
|| array_to_string(_extra_args, ', ') || ')';
execute sql;
end if;
end if;
select 200, 'OK'
into ret_code, ret_note;
return;
end;
$$ language plpgsql;
create or replace function londiste.local_add_table(
in i_queue_name text,
in i_table_name text,
in i_trg_args text[],
in i_table_attrs text,
in i_dest_table text,
out ret_code int4,
out ret_note text)
as $$
-- ----------------------------------------------------------------------
-- Function: londiste.local_add_table(5)
--
-- Register table on Londiste node, with customizable trigger args.
--
-- Parameters:
-- i_queue_name - queue name
-- i_table_name - table name
-- i_trg_args - args to trigger, or magic parameters.
-- i_table_attrs - args to python handler
-- i_dest_table - actual name of destination table (NULL if same)
--
-- Trigger args:
-- See documentation for pgq triggers.
--
-- Magic parameters:
-- no_triggers - skip trigger creation
-- skip_truncate - set 'skip_truncate' table attribute
-- expect_sync - set table state to 'ok'
-- tgflags=X - trigger creation flags
-- merge_all - merge table from all sources. required for
-- multi-source table
-- no_merge - do not merge tables from different sources
-- skip - create skip trigger. same as S flag
-- virtual_table - skips structure check and trigger creation
--
-- Trigger creation flags (default: AIUDL):
-- I - ON INSERT
-- U - ON UPDATE
-- D - ON DELETE
-- Q - use pgq.sqltriga() as trigger function
-- L - use pgq.logutriga() as trigger function
-- B - BEFORE
-- A - AFTER
-- S - SKIP
--
-- Example:
-- > londiste.local_add_table('q', 'tbl', array['tgflags=BI', 'SKIP', 'pkey=col1,col2'])
--
-- Returns:
-- 200 - Ok
-- 301 - Warning, trigger exists that will fire before londiste one
-- 400 - No such set
-- 410 - Table already exists but with different table_attrs
------------------------------------------------------------------------
declare
col_types text;
fq_table_name text;
new_state text;
pgversion int;
logtrg_previous text;
trigger_name text;
tbl record;
i integer;
j integer;
arg text;
_node record;
_tbloid oid;
_combined_queue text;
_combined_table text;
_table_attrs text := i_table_attrs;
-- check local tables from all sources
_queue_name text;
_local boolean;
-- argument flags
_expect_sync boolean := false;
_merge_all boolean := false;
_no_merge boolean := false;
_virtual_table boolean := false;
_dest_table text;
_table_name2 text;
_desc text;
begin
-------- i_trg_args ARGUMENTS PARSING (TODO: use different input param for passing extra options that have nothing to do with trigger)
if array_lower(i_trg_args, 1) is not null then
for i in array_lower(i_trg_args, 1) .. array_upper(i_trg_args, 1) loop
arg := i_trg_args[i];
if arg = 'expect_sync' then
_expect_sync := true;
elsif arg = 'skip_truncate' then
_table_attrs := coalesce(_table_attrs || '&skip_truncate=1', 'skip_truncate=1');
elsif arg = 'merge_all' then
_merge_all = true;
elsif arg = 'no_merge' then
_no_merge = true;
elsif arg = 'virtual_table' then
_virtual_table := true;
_expect_sync := true; -- do not copy
end if;
end loop;
end if;
if _merge_all and _no_merge then
select 405, 'Cannot use merge-all and no-merge together'
into ret_code, ret_note;
return;
end if;
fq_table_name := londiste.make_fqname(i_table_name);
_dest_table := londiste.make_fqname(coalesce(i_dest_table, i_table_name));
if _dest_table = fq_table_name then
_desc := fq_table_name;
else
_desc := fq_table_name || '(' || _dest_table || ')';
end if;
-------- TABLE STRUCTURE CHECK
if not _virtual_table then
_tbloid := londiste.find_table_oid(_dest_table);
if _tbloid is null then
select 404, 'Table does not exist: ' || _desc into ret_code, ret_note;
return;
end if;
col_types := londiste.find_column_types(_dest_table);
if position('k' in col_types) < 1 then
-- allow missing primary key in case of combined table where
-- pkey was removed by londiste
perform 1 from londiste.table_info t,
pgq_node.node_info n_this,
pgq_node.node_info n_other
where n_this.queue_name = i_queue_name
and n_other.combined_queue = n_this.combined_queue
and n_other.queue_name <> n_this.queue_name
and t.queue_name = n_other.queue_name
and coalesce(t.dest_table, t.table_name) = _dest_table
and t.dropped_ddl is not null;
if not found then
select 400, 'Primary key missing on table: ' || _desc into ret_code, ret_note;
return;
end if;
end if;
end if;
-------- TABLE REGISTRATION LOGIC
select * from pgq_node.get_node_info(i_queue_name) into _node;
if not found or _node.ret_code >= 400 then
select 400, 'No such set: ' || i_queue_name into ret_code, ret_note;
return;
end if;
select merge_state, local, table_attrs into tbl
from londiste.table_info
where queue_name = i_queue_name and table_name = fq_table_name;
if not found then
-- add to set on root
if _node.node_type = 'root' then
select f.ret_code, f.ret_note into ret_code, ret_note
from londiste.global_add_table(i_queue_name, i_table_name) f;
if ret_code <> 200 then
return;
end if;
else
select 404, 'Table not available on queue: ' || _desc
into ret_code, ret_note;
return;
end if;
-- reload info
select merge_state, local, table_attrs into tbl
from londiste.table_info
where queue_name = i_queue_name and table_name = fq_table_name;
end if;
if tbl.local then
if tbl.table_attrs is distinct from _table_attrs then
select 410, 'Table ' || _desc || ' already added, but with different args: ' || coalesce(tbl.table_attrs, '') into ret_code, ret_note;
else
select 200, 'Table already added: ' || _desc into ret_code, ret_note;
end if;
return;
end if;
if _node.node_type = 'root' then
new_state := 'ok';
perform londiste.root_notify_change(i_queue_name, 'londiste.add-table', fq_table_name);
elsif _node.node_type = 'leaf' and _node.combined_type = 'branch' then
new_state := 'ok';
elsif _expect_sync then
new_state := 'ok';
else
new_state := NULL;
end if;
update londiste.table_info
set local = true,
merge_state = new_state,
table_attrs = coalesce(_table_attrs, table_attrs),
dest_table = nullif(_dest_table, fq_table_name)
where queue_name = i_queue_name and table_name = fq_table_name;
if not found then
raise exception 'lost table: %', fq_table_name;
end if;
-- merge all table sources on leaf
if _node.node_type = 'leaf' and not _no_merge then
for _queue_name, _table_name2, _local in
select t2.queue_name, t2.table_name, t2.local
from londiste.table_info t
join pgq_node.node_info n on (n.queue_name = t.queue_name)
left join pgq_node.node_info n2 on (n2.combined_queue = n.combined_queue or
(n2.combined_queue is null and n.combined_queue is null))
left join londiste.table_info t2
on (t2.queue_name = n2.queue_name and
coalesce(t2.dest_table, t2.table_name) = coalesce(t.dest_table, t.table_name))
where t.queue_name = i_queue_name
and t.table_name = fq_table_name
and t2.queue_name != i_queue_name -- skip self
loop
-- if table from some other source is already marked as local,
-- raise error
if _local and coalesce(new_state, 'x') <> 'ok' then
select 405, 'Found local table '|| _desc
|| ' in queue ' || _queue_name
|| ', use remove-table first to remove all previous '
|| 'table subscriptions'
into ret_code, ret_note;
return;
end if;
-- when table comes from multiple sources, merge_all switch is
-- required
if not _merge_all and coalesce(new_state, 'x') <> 'ok' then
select 405, 'Found multiple sources for table '|| _desc
|| ', use merge-all or no-merge to continue'
into ret_code, ret_note;
return;
end if;
update londiste.table_info
set local = true,
merge_state = new_state,
table_attrs = coalesce(_table_attrs, table_attrs)
where queue_name = _queue_name and table_name = _table_name2;
if not found then
raise exception 'lost table: % on queue %', _table_name2, _queue_name;
end if;
end loop;
-- if this node has combined_queue, add table there too
-- note: we need to keep both table_name/dest_table values
select n2.queue_name, t.table_name
from pgq_node.node_info n1
join pgq_node.node_info n2
on (n2.queue_name = n1.combined_queue)
left join londiste.table_info t
on (t.queue_name = n2.queue_name and t.table_name = fq_table_name and t.local)
where n1.queue_name = i_queue_name and n2.node_type = 'root'
into _combined_queue, _combined_table;
if found and _combined_table is null then
select f.ret_code, f.ret_note
from londiste.local_add_table(_combined_queue, fq_table_name, i_trg_args, _table_attrs, _dest_table) f
into ret_code, ret_note;
if ret_code >= 300 then
return;
end if;
end if;
end if;
-- create trigger
select f.ret_code, f.ret_note, f.trigger_name
from londiste.create_trigger(i_queue_name, fq_table_name, i_trg_args, _dest_table, _node.node_type) f
into ret_code, ret_note, trigger_name;
if ret_code > 299 then
ret_note := 'Trigger creation failed for table ' || _desc || ': ' || ret_note;
return;
elsif ret_code = 201 then
select 200, 'Table added with no triggers: ' || _desc
into ret_code, ret_note;
return;
end if;
-- Check that no trigger exists on the target table that will get fired
-- before londiste one (this could have londiste replicate data out-of-order)
--
-- Don't report all the trigger names, 8.3 does not have array_accum available.
show server_version_num into pgversion;
if pgversion >= 90000 then
select tg.tgname into logtrg_previous
from pg_class r join pg_trigger tg on (tg.tgrelid = r.oid)
where r.oid = londiste.find_table_oid(_dest_table)
and not tg.tgisinternal
and tg.tgname < trigger_name::name
-- per-row AFTER trigger
and (tg.tgtype & 3) = 1 -- bits: 0:ROW, 1:BEFORE
-- current londiste
and not londiste.is_replica_func(tg.tgfoid)
-- old londiste
and substring(tg.tgname from 1 for 10) != '_londiste_'
and substring(tg.tgname from char_length(tg.tgname) - 6) != '_logger'
order by 1 limit 1;
else
select tg.tgname into logtrg_previous
from pg_class r join pg_trigger tg on (tg.tgrelid = r.oid)
where r.oid = londiste.find_table_oid(_dest_table)
and not tg.tgisconstraint
and tg.tgname < trigger_name::name
-- per-row AFTER trigger
and (tg.tgtype & 3) = 1 -- bits: 0:ROW, 1:BEFORE
-- current londiste
and not londiste.is_replica_func(tg.tgfoid)
-- old londiste
and substring(tg.tgname from 1 for 10) != '_londiste_'
and substring(tg.tgname from char_length(tg.tgname) - 6) != '_logger'
order by 1 limit 1;
end if;
if logtrg_previous is not null then
select 301,
'Table added: ' || _desc
|| ', but londiste trigger is not first: '
|| logtrg_previous
into ret_code, ret_note;
return;
end if;
select 200, 'Table added: ' || _desc into ret_code, ret_note;
return;
end;
$$ language plpgsql;
create or replace function londiste.local_add_table(
in i_queue_name text,
in i_table_name text,
in i_trg_args text[],
in i_table_attrs text,
out ret_code int4,
out ret_note text)
as $$
-- ----------------------------------------------------------------------
-- Function: londiste.local_add_table(4)
--
-- Register table on Londiste node.
-- ----------------------------------------------------------------------
begin
select f.ret_code, f.ret_note into ret_code, ret_note
from londiste.local_add_table(i_queue_name, i_table_name, i_trg_args, i_table_attrs, null) f;
return;
end;
$$ language plpgsql;
create or replace function londiste.local_add_table(
in i_queue_name text,
in i_table_name text,
in i_trg_args text[],
out ret_code int4,
out ret_note text)
as $$
-- ----------------------------------------------------------------------
-- Function: londiste.local_add_table(3)
--
-- Register table on Londiste node.
-- ----------------------------------------------------------------------
begin
select f.ret_code, f.ret_note into ret_code, ret_note
from londiste.local_add_table(i_queue_name, i_table_name, i_trg_args, null) f;
return;
end;
$$ language plpgsql;
create or replace function londiste.local_add_table(
in i_queue_name text,
in i_table_name text,
out ret_code int4,
out ret_note text)
as $$
-- ----------------------------------------------------------------------
-- Function: londiste.local_add_table(2)
--
-- Register table on Londiste node.
-- ----------------------------------------------------------------------
begin
select f.ret_code, f.ret_note into ret_code, ret_note
from londiste.local_add_table(i_queue_name, i_table_name, null) f;
return;
end;
$$ language plpgsql strict;
create or replace function londiste.local_change_handler(
in i_queue_name text,
in i_table_name text,
in i_trg_args text[],
in i_table_attrs text,
out ret_code int4,
out ret_note text)
as $$
----------------------------------------------------------------------------------------------------
-- Function: londiste.local_change_handler(4)
--
-- Change handler and rebuild trigger if needed
--
-- Parameters:
-- i_queue_name - set name
-- i_table_name - table name
-- i_trg_args - args to trigger
-- i_table_attrs - args to python handler
--
-- Returns:
-- 200 - OK
-- 400 - No such set
-- 404 - Table not found
--
----------------------------------------------------------------------------------------------------
declare
_dest_table text;
_desc text;
_node record;
begin
-- get node info
select * from pgq_node.get_node_info(i_queue_name) into _node;
if not found or _node.ret_code >= 400 then
select 400, 'No such set: ' || i_queue_name into ret_code, ret_note;
return;
end if;
-- update table_attrs with new handler info
select f.ret_code, f.ret_note
from londiste.local_set_table_attrs(i_queue_name, i_table_name, i_table_attrs) f
into ret_code, ret_note;
if ret_code <> 200 then
return;
end if;
-- get destination table name for use in trigger creation
select coalesce(ti.dest_table, i_table_name)
from londiste.table_info ti
where queue_name = i_queue_name
and table_name = i_table_name
and local
into _dest_table;
-- replace the trigger if needed
select f.ret_code, f.ret_note
from londiste.create_trigger(i_queue_name, i_table_name, i_trg_args, _dest_table, _node.node_type) f
into ret_code, ret_note;
if _dest_table = i_table_name then
_desc := i_table_name;
else
_desc := i_table_name || '(' || _dest_table || ')';
end if;
if ret_code > 299 then
ret_note := 'Trigger creation failed for table ' || _desc || ': ' || ret_note;
return;
elsif ret_code = 201 then
select 200, 'Table handler updated with no triggers: ' || _desc
into ret_code, ret_note;
return;
end if;
select 200, 'Handler changed for table: ' || _desc
into ret_code, ret_note;
return;
end;
$$ language plpgsql;
create or replace function londiste.local_remove_seq(
in i_queue_name text, in i_seq_name text,
out ret_code int4, out ret_note text)
as $$
-- ----------------------------------------------------------------------
-- Function: londiste.local_remove_seq(2)
--
-- Remove sequence.
--
-- Parameters:
-- i_queue_name - set name
-- i_seq_name - sequence name
--
-- Returns:
-- 200 - OK
-- 404 - Sequence not found
-- ----------------------------------------------------------------------
declare
fqname text;
begin
fqname := londiste.make_fqname(i_seq_name);
if pgq_node.is_root_node(i_queue_name) then
select f.ret_code, f.ret_note
into ret_code, ret_note
from londiste.global_remove_seq(i_queue_name, fqname) f;
return;
end if;
update londiste.seq_info
set local = false
where queue_name = i_queue_name
and seq_name = fqname
and local;
if not found then
select 404, 'Sequence not found: '||fqname into ret_code, ret_note;
return;
end if;
select 200, 'Sequence removed: '||fqname into ret_code, ret_note;
return;
end;
$$ language plpgsql strict;
create or replace function londiste.local_remove_table(
in i_queue_name text, in i_table_name text,
out ret_code int4, out ret_note text)
as $$
-- ----------------------------------------------------------------------
-- Function: londiste.local_remove_table(2)
--
-- Remove table.
--
-- Parameters:
-- i_queue_name - set name
-- i_table_name - table name
--
-- Returns:
-- 200 - OK
-- 404 - Table not found
-- ----------------------------------------------------------------------
declare
fq_table_name text;
qtbl text;
seqname text;
tbl record;
tbl_oid oid;
pgver integer;
begin
fq_table_name := londiste.make_fqname(i_table_name);
qtbl := londiste.quote_fqname(fq_table_name);
tbl_oid := londiste.find_table_oid(i_table_name);
show server_version_num into pgver;
select local, dropped_ddl, merge_state into tbl
from londiste.table_info
where queue_name = i_queue_name
and table_name = fq_table_name
for update;
if not found then
select 400, 'Table not found: ' || fq_table_name into ret_code, ret_note;
return;
end if;
if tbl.local then
perform londiste.drop_table_triggers(i_queue_name, fq_table_name);
-- restore dropped ddl
if tbl.dropped_ddl is not null then
-- table is not synced, drop data to make restore faster
if pgver >= 80400 then
execute 'TRUNCATE ONLY ' || qtbl;
else
execute 'TRUNCATE ' || qtbl;
end if;
execute tbl.dropped_ddl;
end if;
-- reset data
update londiste.table_info
set local = false,
custom_snapshot = null,
table_attrs = null,
dropped_ddl = null,
merge_state = null,
dest_table = null
where queue_name = i_queue_name
and table_name = fq_table_name;
-- drop dependent sequence
for seqname in
select n.nspname || '.' || s.relname
from pg_catalog.pg_class s,
pg_catalog.pg_namespace n,
pg_catalog.pg_attribute a
where a.attrelid = tbl_oid
and a.atthasdef
and a.atttypid::regtype::text in ('integer', 'bigint')
and s.oid = pg_get_serial_sequence(qtbl, a.attname)::regclass::oid
and n.oid = s.relnamespace
loop
perform londiste.local_remove_seq(i_queue_name, seqname);
end loop;
else
if not pgq_node.is_root_node(i_queue_name) then
select 400, 'Table not registered locally: ' || fq_table_name into ret_code, ret_note;
return;
end if;
end if;
if pgq_node.is_root_node(i_queue_name) then
perform londiste.global_remove_table(i_queue_name, fq_table_name);
perform londiste.root_notify_change(i_queue_name, 'londiste.remove-table', fq_table_name);
end if;
select 200, 'Table removed: ' || fq_table_name into ret_code, ret_note;
return;
end;
$$ language plpgsql strict;
-- Group: Global object registrations (internal)
create or replace function londiste.global_add_table(
in i_queue_name text,
in i_table_name text,
out ret_code int4,
out ret_note text)
as $$
-- ----------------------------------------------------------------------
-- Function: londiste.global_add_table(2)
--
-- Register table on Londiste set.
--
-- This means its available from root, events for it appear
-- in queue and nodes can attach to it.
--
-- Called by:
-- on root - londiste.local_add_table()
-- elsewhere - londiste consumer when receives new table event
--
-- Returns:
-- 200 - Ok
-- 400 - No such set
-- ----------------------------------------------------------------------
declare
fq_table_name text;
_cqueue text;
begin
fq_table_name := londiste.make_fqname(i_table_name);
select combined_queue into _cqueue
from pgq_node.node_info
where queue_name = i_queue_name
for update;
if not found then
select 400, 'No such queue: ' || i_queue_name into ret_code, ret_note;
return;
end if;
perform 1 from londiste.table_info where queue_name = i_queue_name and table_name = fq_table_name;
if found then
select 200, 'Table already added: ' || fq_table_name into ret_code, ret_note;
return;
end if;
insert into londiste.table_info (queue_name, table_name)
values (i_queue_name, fq_table_name);
select 200, 'Table added: ' || i_table_name
into ret_code, ret_note;
-- let the combined node know about it too
if _cqueue is not null then
perform londiste.global_add_table(_cqueue, i_table_name);
end if;
return;
exception
-- seems the row was added from parallel connection (setup vs. replay)
when unique_violation then
select 200, 'Table already added: ' || i_table_name
into ret_code, ret_note;
return;
end;
$$ language plpgsql strict;
create or replace function londiste.global_remove_table(
in i_queue_name text, in i_table_name text,
out ret_code int4, out ret_note text)
as $$
-- ----------------------------------------------------------------------
-- Function: londiste.global_remove_table(2)
--
-- Removes tables registration in set.
--
-- Means that nodes cannot attach to this table anymore.
--
-- Called by:
-- - On root by londiste.local_remove_table()
-- - Elsewhere by consumer receiving table remove event
--
-- Returns:
-- 200 - OK
-- 400 - not found
-- ----------------------------------------------------------------------
declare
fq_table_name text;
begin
fq_table_name := londiste.make_fqname(i_table_name);
if not pgq_node.is_root_node(i_queue_name) then
perform londiste.local_remove_table(i_queue_name, fq_table_name);
end if;
delete from londiste.table_info
where queue_name = i_queue_name
and table_name = fq_table_name;
if not found then
select 400, 'Table not found: ' || fq_table_name
into ret_code, ret_note;
return;
end if;
select 200, 'Table removed: ' || i_table_name
into ret_code, ret_note;
return;
end;
$$ language plpgsql strict;
create or replace function londiste.global_update_seq(
in i_queue_name text, in i_seq_name text, in i_value int8,
out ret_code int4, out ret_note text)
as $$
-- ----------------------------------------------------------------------
-- Function: londiste.global_update_seq(3)
--
-- Update seq.
--
-- Parameters:
-- i_queue_name - set name
-- i_seq_name - seq name
-- i_value - new published value
--
-- Returns:
-- 200 - OK
-- ----------------------------------------------------------------------
declare
n record;
fqname text;
seq record;
begin
select node_type, node_name into n
from pgq_node.node_info
where queue_name = i_queue_name;
if not found then
select 404, 'Set not found: ' || i_queue_name into ret_code, ret_note;
return;
end if;
if n.node_type = 'root' then
select 402, 'Must not run on root node' into ret_code, ret_note;
return;
end if;
fqname := londiste.make_fqname(i_seq_name);
select last_value, local from londiste.seq_info
into seq
where queue_name = i_queue_name and seq_name = fqname
for update;
if not found then
insert into londiste.seq_info
(queue_name, seq_name, last_value)
values (i_queue_name, fqname, i_value);
else
update londiste.seq_info
set last_value = i_value
where queue_name = i_queue_name and seq_name = fqname;
if seq.local then
perform pgq.seq_setval(fqname, i_value);
end if;
end if;
select 200, 'Sequence updated' into ret_code, ret_note;
return;
end;
$$ language plpgsql;
create or replace function londiste.global_remove_seq(
in i_queue_name text, in i_seq_name text,
out ret_code int4, out ret_note text)
as $$
-- ----------------------------------------------------------------------
-- Function: londiste.global_remove_seq(2)
--
-- Removes sequence registration in set.
--
-- Called by:
-- - On root by londiste.local_remove_seq()
-- - Elsewhere by consumer receiving seq remove event
--
-- Returns:
-- 200 - OK
-- 400 - not found
-- ----------------------------------------------------------------------
declare
fq_name text;
begin
fq_name := londiste.make_fqname(i_seq_name);
delete from londiste.seq_info
where queue_name = i_queue_name
and seq_name = fq_name;
if not found then
select 400, 'Sequence not found: '||fq_name into ret_code, ret_note;
return;
end if;
if pgq_node.is_root_node(i_queue_name) then
perform londiste.root_notify_change(i_queue_name, 'londiste.remove-seq', fq_name);
end if;
select 200, 'Sequence removed: '||fq_name into ret_code, ret_note;
return;
end;
$$ language plpgsql strict;
-- Group: FKey handling
create or replace function londiste.get_table_pending_fkeys(i_table_name text)
returns setof londiste.pending_fkeys as $$
-- ----------------------------------------------------------------------
-- Function: londiste.get_table_pending_fkeys(1)
--
-- Return dropped fkeys for table.
--
-- Parameters:
-- i_table_name - fqname
--
-- Returns:
-- desc
-- ----------------------------------------------------------------------
declare
fkeys record;
begin
for fkeys in
select *
from londiste.pending_fkeys
where from_table = i_table_name or to_table = i_table_name
order by 1,2,3
loop
return next fkeys;
end loop;
return;
end;
$$ language plpgsql strict stable;
create or replace function londiste.get_valid_pending_fkeys(i_queue_name text)
returns setof londiste.pending_fkeys as $$
-- ----------------------------------------------------------------------
-- Function: londiste.get_valid_pending_fkeys(1)
--
-- Returns dropped fkeys where both sides are in sync now.
--
-- Parameters:
-- i_queue_name - cascaded queue name
--
-- Returns:
-- desc
-- ----------------------------------------------------------------------
declare
fkeys record;
begin
for fkeys in
select pf.*
from londiste.pending_fkeys pf
order by 1, 2, 3
loop
perform 1
from londiste.table_info st_from
where coalesce(st_from.dest_table, st_from.table_name) = fkeys.from_table
and st_from.merge_state = 'ok'
and st_from.custom_snapshot is null
and st_from.queue_name = i_queue_name;
if not found then
continue;
end if;
perform 1
from londiste.table_info st_to
where coalesce(st_to.dest_table, st_to.table_name) = fkeys.to_table
and st_to.merge_state = 'ok'
and st_to.custom_snapshot is null
and st_to.queue_name = i_queue_name;
if not found then
continue;
end if;
return next fkeys;
end loop;
return;
end;
$$ language plpgsql strict stable;
create or replace function londiste.drop_table_fkey(i_from_table text, i_fkey_name text)
returns integer as $$
-- ----------------------------------------------------------------------
-- Function: londiste.drop_table_fkey(2)
--
-- Drop one fkey, save in pending table.
-- ----------------------------------------------------------------------
declare
fkey record;
begin
select * into fkey
from londiste.find_table_fkeys(i_from_table)
where fkey_name = i_fkey_name and from_table = i_from_table;
if not found then
return 0;
end if;
insert into londiste.pending_fkeys values (fkey.from_table, fkey.to_table, i_fkey_name, fkey.fkey_def);
execute 'alter table only ' || londiste.quote_fqname(fkey.from_table)
|| ' drop constraint ' || quote_ident(i_fkey_name);
return 1;
end;
$$ language plpgsql strict;
create or replace function londiste.restore_table_fkey(i_from_table text, i_fkey_name text)
returns integer as $$
-- ----------------------------------------------------------------------
-- Function: londiste.restore_table_fkey(2)
--
-- Restore dropped fkey.
--
-- Parameters:
-- i_from_table - source table
-- i_fkey_name - fkey name
--
-- Returns:
-- nothing
-- ----------------------------------------------------------------------
declare
fkey record;
begin
select * into fkey
from londiste.pending_fkeys
where fkey_name = i_fkey_name and from_table = i_from_table;
if not found then
return 0;
end if;
execute fkey.fkey_def;
delete from londiste.pending_fkeys where fkey_name = fkey.fkey_name;
return 1;
end;
$$ language plpgsql strict;
-- Group: Execute handling
create or replace function londiste.execute_start(
in i_queue_name text,
in i_file_name text,
in i_sql text,
in i_expect_root boolean,
in i_attrs text,
out ret_code int4,
out ret_note text)
as $$
-- ----------------------------------------------------------------------
-- Function: londiste.execute_start(5)
--
-- Start execution of DDL. Should be called at the
-- start of the transaction that does the SQL execution.
--
-- Called-by:
-- Londiste setup tool on root, replay on branches/leafs.
--
-- Parameters:
-- i_queue_name - cascaded queue name
-- i_file_name - Unique ID for SQL
-- i_sql - Actual script (informative, not used here)
-- i_expect_root - Is this on root? Setup tool sets this to avoid
-- execution on branches.
-- i_attrs - urlencoded dict of extra attributes.
-- The value will be put into ev_extra2
-- field of outgoing event.
--
-- Returns:
-- 200 - Proceed.
-- 201 - Already applied
-- 401 - Not root.
-- 404 - No such queue
-- ----------------------------------------------------------------------
declare
is_root boolean;
begin
is_root := pgq_node.is_root_node(i_queue_name);
if i_expect_root then
if not is_root then
select 401, 'Node is not root node: ' || i_queue_name
into ret_code, ret_note;
return;
end if;
end if;
perform 1 from londiste.applied_execute
where execute_file = i_file_name;
if found then
select 201, 'EXECUTE: "' || i_file_name || '" already applied, skipping'
into ret_code, ret_note;
return;
end if;
-- this also lock against potetial parallel execute
insert into londiste.applied_execute (queue_name, execute_file, execute_sql, execute_attrs)
values (i_queue_name, i_file_name, i_sql, i_attrs);
select 200, 'Executing: ' || i_file_name into ret_code, ret_note;
return;
end;
$$ language plpgsql;
create or replace function londiste.execute_start(
in i_queue_name text,
in i_file_name text,
in i_sql text,
in i_expect_root boolean,
out ret_code int4,
out ret_note text)
as $$
-- ----------------------------------------------------------------------
-- Function: londiste.execute_start(4)
--
-- Start execution of DDL. Should be called at the
-- start of the transaction that does the SQL execution.
--
-- Called-by:
-- Londiste setup tool on root, replay on branches/leafs.
--
-- Parameters:
-- i_queue_name - cascaded queue name
-- i_file_name - Unique ID for SQL
-- i_sql - Actual script (informative, not used here)
-- i_expect_root - Is this on root? Setup tool sets this to avoid
-- execution on branches.
--
-- Returns:
-- 200 - Proceed.
-- 301 - Already applied
-- 401 - Not root.
-- 404 - No such queue
-- ----------------------------------------------------------------------
begin
select f.ret_code, f.ret_note
from londiste.execute_start(i_queue_name, i_file_name, i_sql, i_expect_root, null) f
into ret_code, ret_note;
return;
end;
$$ language plpgsql;
create or replace function londiste.execute_finish(
in i_queue_name text,
in i_file_name text,
out ret_code int4,
out ret_note text)
as $$
-- ----------------------------------------------------------------------
-- Function: londiste.execute_finish(2)
--
-- Finish execution of DDL. Should be called at the
-- end of the transaction that does the SQL execution.
--
-- Called-by:
-- Londiste setup tool on root, replay on branches/leafs.
--
-- Returns:
-- 200 - Proceed.
-- 404 - Current entry not found, execute_start() was not called?
-- ----------------------------------------------------------------------
declare
is_root boolean;
sql text;
attrs text;
begin
is_root := pgq_node.is_root_node(i_queue_name);
select execute_sql, execute_attrs
into sql, attrs
from londiste.applied_execute
where execute_file = i_file_name;
if not found then
select 404, 'execute_file called without execute_start'
into ret_code, ret_note;
return;
end if;
if is_root then
perform pgq.insert_event(i_queue_name, 'EXECUTE', sql, i_file_name, attrs, null, null);
end if;
select 200, 'Execute finished: ' || i_file_name into ret_code, ret_note;
return;
end;
$$ language plpgsql strict;
-- Group: Internal functions
create or replace function londiste.root_check_seqs(
in i_queue_name text, in i_buffer int8,
out ret_code int4, out ret_note text)
as $$
-- ----------------------------------------------------------------------
-- Function: londiste.root_check_seqs(1)
--
-- Check sequences, and publish values if needed.
--
-- Parameters:
-- i_queue_name - set name
-- i_buffer - safety room
--
-- Returns:
-- 200 - OK
-- 402 - Not a root node
-- 404 - Queue not found
-- ----------------------------------------------------------------------
declare
n record;
seq record;
real_value int8;
pub_value int8;
real_buffer int8;
begin
if i_buffer is null or i_buffer < 10 then
real_buffer := 10000;
else
real_buffer := i_buffer;
end if;
select node_type, node_name into n
from pgq_node.node_info
where queue_name = i_queue_name
for update;
if not found then
select 404, 'Queue not found: ' || i_queue_name into ret_code, ret_note;
return;
end if;
if n.node_type <> 'root' then
select 402, 'Not a root node' into ret_code, ret_note;
return;
end if;
for seq in
select seq_name, last_value,
londiste.quote_fqname(seq_name) as fqname
from londiste.seq_info
where queue_name = i_queue_name
and local
order by nr
loop
execute 'select last_value from ' || seq.fqname into real_value;
if real_value + real_buffer >= seq.last_value then
pub_value := real_value + real_buffer * 3;
perform pgq.insert_event(i_queue_name, 'londiste.update-seq',
pub_value::text, seq.seq_name, null, null, null);
update londiste.seq_info set last_value = pub_value
where queue_name = i_queue_name
and seq_name = seq.seq_name;
end if;
end loop;
select 100, 'Sequences updated' into ret_code, ret_note;
return;
end;
$$ language plpgsql;
create or replace function londiste.root_check_seqs(
in i_queue_name text,
out ret_code int4, out ret_note text)
as $$
begin
select f.ret_code, f.ret_note
into ret_code, ret_note
from londiste.root_check_seqs(i_queue_name, 10000) f;
return;
end;
$$ language plpgsql;
create or replace function londiste.root_notify_change(i_queue_name text, i_ev_type text, i_ev_data text)
returns integer as $$
-- ----------------------------------------------------------------------
-- Function: londiste.root_notify_change(3)
--
-- Send event about change in root downstream.
-- ----------------------------------------------------------------------
declare
que text;
ntype text;
begin
if not coalesce(pgq_node.is_root_node(i_queue_name), false) then
raise exception 'only root node can send events';
end if;
perform pgq.insert_event(i_queue_name, i_ev_type, i_ev_data);
return 1;
end;
$$ language plpgsql;
create or replace function londiste.local_set_table_state(
in i_queue_name text,
in i_table_name text,
in i_snapshot text,
in i_merge_state text,
out ret_code int4,
out ret_note text)
as $$
-- ----------------------------------------------------------------------
-- Function: londiste.local_set_table_state(4)
--
-- Change table state.
--
-- Parameters:
-- i_queue_name - cascaded queue name
-- i_table - table name
-- i_snapshot - optional remote snapshot info
-- i_merge_state - merge state
-- ----------------------------------------------------------------------
declare
_tbl text;
begin
_tbl = londiste.make_fqname(i_table_name);
update londiste.table_info
set custom_snapshot = i_snapshot,
merge_state = i_merge_state
where queue_name = i_queue_name
and table_name = _tbl
and local;
if not found then
select 404, 'No such table: ' || _tbl
into ret_code, ret_note;
return;
end if;
select 200, 'Table ' || _tbl || ' state set to '
|| coalesce(quote_literal(i_merge_state), 'NULL')
into ret_code, ret_note;
return;
end;
$$ language plpgsql;
create or replace function londiste.local_set_table_attrs(
in i_queue_name text,
in i_table_name text,
in i_table_attrs text,
out ret_code int4,
out ret_note text)
as $$
-- ----------------------------------------------------------------------
-- Function: londiste.local_set_table_attrs(3)
--
-- Store urlencoded table attributes.
--
-- Parameters:
-- i_queue_name - cascaded queue name
-- i_table - table name
-- i_table_attrs - urlencoded attributes
-- ----------------------------------------------------------------------
begin
update londiste.table_info
set table_attrs = i_table_attrs
where queue_name = i_queue_name
and table_name = i_table_name
and local;
if found then
select 200, i_table_name || ': Table attributes stored'
into ret_code, ret_note;
else
select 404, 'no such local table: ' || i_table_name
into ret_code, ret_note;
end if;
return;
end;
$$ language plpgsql;
create or replace function londiste.local_set_table_struct(
in i_queue_name text,
in i_table_name text,
in i_dropped_ddl text,
out ret_code int4,
out ret_note text)
as $$
-- ----------------------------------------------------------------------
-- Function: londiste.local_set_table_struct(3)
--
-- Store dropped table struct temporarily.
--
-- Parameters:
-- i_queue_name - cascaded queue name
-- i_table - table name
-- i_dropped_ddl - merge state
-- ----------------------------------------------------------------------
begin
update londiste.table_info
set dropped_ddl = i_dropped_ddl
where queue_name = i_queue_name
and table_name = i_table_name
and local;
if found then
select 200, 'Table struct stored'
into ret_code, ret_note;
else
select 404, 'no such local table: '||i_table_name
into ret_code, ret_note;
end if;
return;
end;
$$ language plpgsql;
create or replace function londiste.periodic_maintenance()
returns integer as $$
-- ----------------------------------------------------------------------
-- Function: londiste.periodic_maintenance(0)
--
-- Clean random stuff.
-- ----------------------------------------------------------------------
begin
-- clean old EXECUTE entries
delete from londiste.applied_execute
where execute_time < now() - '3 months'::interval;
return 0;
end;
$$ language plpgsql; -- need admin access
-- Group: Utility functions
create or replace function londiste.find_column_types(tbl text)
returns text as $$
-- ----------------------------------------------------------------------
-- Function: londiste.find_column_types(1)
--
-- Returns columnt type string for logtriga().
--
-- Parameters:
-- tbl - fqname
--
-- Returns:
-- String of 'kv'.
-- ----------------------------------------------------------------------
declare
res text;
col record;
tbl_oid oid;
begin
tbl_oid := londiste.find_table_oid(tbl);
res := '';
for col in
SELECT CASE WHEN k.attname IS NOT NULL THEN 'k' ELSE 'v' END AS type
FROM pg_attribute a LEFT JOIN (
SELECT k.attname FROM pg_index i, pg_attribute k
WHERE i.indrelid = tbl_oid AND k.attrelid = i.indexrelid
AND i.indisprimary AND k.attnum > 0 AND NOT k.attisdropped
) k ON (k.attname = a.attname)
WHERE a.attrelid = tbl_oid AND a.attnum > 0 AND NOT a.attisdropped
ORDER BY a.attnum
loop
res := res || col.type;
end loop;
return res;
end;
$$ language plpgsql strict stable;
create or replace function londiste.find_table_fkeys(i_table_name text)
returns setof londiste.pending_fkeys as $$
-- ----------------------------------------------------------------------
-- Function: londiste.find_table_fkeys(1)
--
-- Return all active fkeys.
--
-- Parameters:
-- i_table_name - fqname
--
-- Returns:
-- from_table - fqname
-- to_table - fqname
-- fkey_name - name
-- fkey_def - full def
-- ----------------------------------------------------------------------
declare
fkey record;
tbl_oid oid;
begin
select londiste.find_table_oid(i_table_name) into tbl_oid;
for fkey in
select n1.nspname || '.' || t1.relname as from_table, n2.nspname || '.' || t2.relname as to_table,
conname::text as fkey_name,
'alter table only ' || quote_ident(n1.nspname) || '.' || quote_ident(t1.relname)
|| ' add constraint ' || quote_ident(conname::text) || ' ' || pg_get_constraintdef(c.oid)
as fkey_def
from pg_constraint c, pg_namespace n1, pg_class t1, pg_namespace n2, pg_class t2
where c.contype = 'f' and (c.conrelid = tbl_oid or c.confrelid = tbl_oid)
and t1.oid = c.conrelid and n1.oid = t1.relnamespace
and t2.oid = c.confrelid and n2.oid = t2.relnamespace
order by 1,2,3
loop
return next fkey;
end loop;
return;
end;
$$ language plpgsql strict stable;
drop function if exists londiste.find_seq_oid(text);
drop function if exists londiste.find_table_oid(text);
drop function if exists londiste.find_rel_oid(text, text);
create or replace function londiste.find_rel_oid(i_fqname text, i_kind text)
returns oid as $$
-- ----------------------------------------------------------------------
-- Function: londiste.find_rel_oid(2)
--
-- Find pg_class row oid.
--
-- Parameters:
-- i_fqname - fq object name
-- i_kind - relkind value
--
-- Returns:
-- oid or exception of not found
-- ----------------------------------------------------------------------
declare
res oid;
pos integer;
schema text;
name text;
begin
pos := position('.' in i_fqname);
if pos > 0 then
schema := substring(i_fqname for pos - 1);
name := substring(i_fqname from pos + 1);
else
schema := 'public';
name := i_fqname;
end if;
select c.oid into res
from pg_namespace n, pg_class c
where c.relnamespace = n.oid
and c.relkind = i_kind
and n.nspname = schema and c.relname = name;
if not found then
res := NULL;
end if;
return res;
end;
$$ language plpgsql strict stable;
create or replace function londiste.find_table_oid(tbl text)
returns oid as $$
-- ----------------------------------------------------------------------
-- Function: londiste.find_table_oid(1)
--
-- Find table oid based on fqname.
--
-- Parameters:
-- tbl - fqname
--
-- Returns:
-- oid
-- ----------------------------------------------------------------------
begin
return londiste.find_rel_oid(tbl, 'r');
end;
$$ language plpgsql strict stable;
create or replace function londiste.find_seq_oid(seq text)
returns oid as $$
-- ----------------------------------------------------------------------
-- Function: londiste.find_seq_oid(1)
--
-- Find sequence oid based on fqname.
--
-- Parameters:
-- seq - fqname
--
-- Returns:
-- oid
-- ----------------------------------------------------------------------
begin
return londiste.find_rel_oid(seq, 'S');
end;
$$ language plpgsql strict stable;
create or replace function londiste.quote_fqname(i_name text)
returns text as $$
-- ----------------------------------------------------------------------
-- Function: londiste.quote_fqname(1)
--
-- Quete fully-qualified object name for SQL.
--
-- First dot is taken as schema separator.
--
-- If schema is missing, 'public' is assumed.
--
-- Parameters:
-- i_name - fully qualified object name.
--
-- Returns:
-- Quoted name.
-- ----------------------------------------------------------------------
declare
res text;
pos integer;
s text;
n text;
begin
pos := position('.' in i_name);
if pos > 0 then
s := substring(i_name for pos - 1);
n := substring(i_name from pos + 1);
else
s := 'public';
n := i_name;
end if;
return quote_ident(s) || '.' || quote_ident(n);
end;
$$ language plpgsql strict immutable;
create or replace function londiste.make_fqname(i_name text)
returns text as $$
-- ----------------------------------------------------------------------
-- Function: londiste.make_fqname(1)
--
-- Make name to schema-qualified one.
--
-- First dot is taken as schema separator.
--
-- If schema is missing, 'public' is assumed.
--
-- Parameters:
-- i_name - object name.
--
-- Returns:
-- Schema qualified name.
-- ----------------------------------------------------------------------
begin
if position('.' in i_name) > 0 then
return i_name;
else
return 'public.' || i_name;
end if;
end;
$$ language plpgsql strict immutable;
create or replace function londiste.split_fqname(
in i_fqname text,
out schema_part text,
out name_part text)
as $$
-- ----------------------------------------------------------------------
-- Function: londiste.split_fqname(1)
--
-- Split fqname to schema and name parts.
--
-- First dot is taken as schema separator.
--
-- If schema is missing, 'public' is assumed.
--
-- Parameters:
-- i_fqname - object name.
-- ----------------------------------------------------------------------
declare
dot integer;
begin
dot = position('.' in i_fqname);
if dot > 0 then
schema_part = substring(i_fqname for dot - 1);
name_part = substring(i_fqname from dot + 1);
else
schema_part = 'public';
name_part = i_fqname;
end if;
return;
end;
$$ language plpgsql strict immutable;
create or replace function londiste.table_info_trigger()
returns trigger as $$
-- ----------------------------------------------------------------------
-- Function: londiste.table_info_trigger(0)
--
-- Trigger on londiste.table_info. Cleans triggers from tables
-- when table is removed from londiste.table_info.
-- ----------------------------------------------------------------------
begin
if TG_OP = 'DELETE' then
perform londiste.drop_table_triggers(OLD.queue_name, OLD.table_name);
end if;
return OLD;
end;
$$ language plpgsql;
create or replace function londiste.drop_table_triggers(
in i_queue_name text, in i_table_name text)
returns void as $$
-- ----------------------------------------------------------------------
-- Function: londiste.drop_table_triggers(2)
--
-- Remove Londiste triggers from table.
--
-- Parameters:
-- i_queue_name - set name
-- i_table_name - table name
--
-- Returns:
-- 200 - OK
-- 404 - Table not found
-- ----------------------------------------------------------------------
declare
logtrg_name text;
b_queue_name bytea;
_dest_table text;
begin
select coalesce(dest_table, table_name)
from londiste.table_info t
where t.queue_name = i_queue_name
and t.table_name = i_table_name
into _dest_table;
if not found then
return;
end if;
-- skip if no triggers found on that table
perform 1 from pg_catalog.pg_trigger where tgrelid = londiste.find_table_oid(_dest_table);
if not found then
return;
end if;
-- cast to bytea
b_queue_name := decode(replace(i_queue_name, E'\\', E'\\\\'), 'escape');
-- drop all replication triggers that target our queue.
-- by checking trigger func and queue name there is not
-- dependency on naming standard or side-storage.
for logtrg_name in
select tgname from pg_catalog.pg_trigger
where tgrelid = londiste.find_table_oid(_dest_table)
and londiste.is_replica_func(tgfoid)
and octet_length(tgargs) > 0
and substring(tgargs for (position(E'\\000'::bytea in tgargs) - 1)) = b_queue_name
loop
execute 'drop trigger ' || quote_ident(logtrg_name)
|| ' on ' || londiste.quote_fqname(_dest_table);
end loop;
end;
$$ language plpgsql strict;
create or replace function londiste.is_replica_func(func_oid oid)
returns boolean as $$
-- ----------------------------------------------------------------------
-- Function: londiste.is_replica_func(1)
--
-- Returns true if function is a PgQ-based replication functions.
-- This also means it takes queue name as first argument.
-- ----------------------------------------------------------------------
select count(1) > 0
from pg_proc f join pg_namespace n on (n.oid = f.pronamespace)
where f.oid = $1 and n.nspname = 'pgq' and f.proname in ('sqltriga', 'logutriga');
$$ language sql strict stable;
create or replace function londiste.version()
returns text as $$
-- ----------------------------------------------------------------------
-- Function: londiste.version(0)
--
-- Returns version string for londiste. ATM it is based on SkyTools
-- version and only bumped when database code changes.
-- ----------------------------------------------------------------------
begin
return '3.2';
end;
$$ language plpgsql;
-- Group: Utility functions for handlers
create or replace function londiste.create_partition(
i_table text,
i_part text,
i_pkeys text,
i_part_field text,
i_part_time timestamptz,
i_part_period text
) returns int as $$
------------------------------------------------------------------------
-- Function: londiste.create_partition
--
-- Creates inherited child table if it does not exist by copying parent table's structure.
-- Locks londiste.table_info table to avoid parallel creation of any partitions.
--
-- Elements that are copied over by "LIKE x INCLUDING ALL":
-- * Defaults
-- * Constraints
-- * Indexes
-- * Storage options (9.0+)
-- * Comments (9.0+)
--
-- Elements that are copied over manually because LIKE ALL does not support them:
-- * Grants
-- * Triggers
-- * Rules
--
-- Parameters:
-- i_table - name of parent table
-- i_part - name of partition table to create
-- i_pkeys - primary key fields (comma separated, used to create constraint).
-- i_part_field - field used to partition table (when not partitioned by field, value is NULL)
-- i_part_time - partition time
-- i_part_period - period of partitioned data, current possible values are 'hour', 'day', 'month' and 'year'
--
-- Example:
-- select londiste.create_partition('aggregate.user_call_monthly', 'aggregate.user_call_monthly_2010_01', 'key_user', 'period_start', '2010-01-10 11:00'::timestamptz, 'month');
--
------------------------------------------------------------------------
declare
chk_start text;
chk_end text;
part_start timestamptz;
part_end timestamptz;
parent_schema text;
parent_name text;
parent_oid oid;
part_schema text;
part_name text;
owner name;
pos int4;
fq_table text;
fq_part text;
q_grantee text;
g record;
r record;
tg record;
sql text;
pgver integer;
r_oldtbl text;
r_extra text;
r_sql text;
begin
if i_table is null or i_part is null then
raise exception 'need table and part';
end if;
-- load postgres version (XYYZZ).
show server_version_num into pgver;
-- parent table schema and name + quoted name
pos := position('.' in i_table);
if pos > 0 then
parent_schema := substring(i_table for pos - 1);
parent_name := substring(i_table from pos + 1);
else
parent_schema := 'public';
parent_name := i_table;
end if;
fq_table := quote_ident(parent_schema) || '.' || quote_ident(parent_name);
-- part table schema and name + quoted name
pos := position('.' in i_part);
if pos > 0 then
part_schema := substring(i_part for pos - 1);
part_name := substring(i_part from pos + 1);
else
part_schema := 'public';
part_name := i_part;
end if;
fq_part := quote_ident(part_schema) || '.' || quote_ident(part_name);
-- allow only single creation at a time, without affecting DML operations
-- (changed from locking parent table to avoid deadlocks from concurrent workers)
execute 'lock table londiste.table_info in share update exclusive mode';
parent_oid := fq_table::regclass::oid;
-- check if part table exists
perform 1 from pg_class t, pg_namespace s
where t.relnamespace = s.oid
and s.nspname = part_schema
and t.relname = part_name;
if found then
return 0;
end if;
-- need to use 'like' to get indexes
sql := 'create table ' || fq_part || ' (like ' || fq_table;
if pgver >= 90000 then
sql := sql || ' including all';
else
sql := sql || ' including indexes including constraints including defaults';
end if;
sql := sql || ') inherits (' || fq_table || ')';
execute sql;
-- find out parent table owner
select o.rolname into owner
from pg_class t, pg_namespace s, pg_roles o
where t.relnamespace = s.oid
and s.nspname = parent_schema
and t.relname = parent_name
and t.relowner = o.oid;
-- set proper part table ownership
if owner != user then
sql = 'alter table ' || fq_part || ' owner to ' || quote_ident(owner);
execute sql;
end if;
-- extra check constraint
if i_part_field != '' then
part_start := date_trunc(i_part_period, i_part_time);
part_end := part_start + ('1 ' || i_part_period)::interval;
chk_start := quote_literal(to_char(part_start, 'YYYY-MM-DD HH24:MI:SS'));
chk_end := quote_literal(to_char(part_end, 'YYYY-MM-DD HH24:MI:SS'));
sql := 'alter table '|| fq_part || ' add check ('
|| quote_ident(i_part_field) || ' >= ' || chk_start || ' and '
|| quote_ident(i_part_field) || ' < ' || chk_end || ')';
execute sql;
end if;
-- load grants from parent table
for g in
select grantor, grantee, privilege_type, is_grantable
from information_schema.table_privileges
where table_schema = parent_schema
and table_name = parent_name
loop
if g.grantee = 'PUBLIC' then
q_grantee = 'public';
else
q_grantee := quote_ident(g.grantee);
end if;
sql := 'grant ' || g.privilege_type || ' on ' || fq_part || ' to ' || q_grantee;
if g.is_grantable = 'YES' then
sql := sql || ' with grant option';
end if;
execute sql;
end loop;
-- generate triggers info query
sql := 'SELECT tgname, tgenabled,'
|| ' pg_catalog.pg_get_triggerdef(oid) as tgdef'
|| ' FROM pg_catalog.pg_trigger '
|| ' WHERE tgrelid = ' || parent_oid::text
|| ' AND ';
if pgver >= 90000 then
sql := sql || ' NOT tgisinternal';
else
sql := sql || ' NOT tgisconstraint';
end if;
-- copy triggers
for tg in execute sql
loop
sql := regexp_replace(tg.tgdef, E' ON ([[:alnum:]_.]+|"([^"]|"")+")+ ', ' ON ' || fq_part || ' ');
if sql = tg.tgdef then
raise exception 'Failed to reconstruct the trigger: %', sql;
end if;
execute sql;
if tg.tgenabled = 'O' then
-- standard mode
r_extra := NULL;
elsif tg.tgenabled = 'D' then
r_extra := ' DISABLE TRIGGER ';
elsif tg.tgenabled = 'A' then
r_extra := ' ENABLE ALWAYS TRIGGER ';
elsif tg.tgenabled = 'R' then
r_extra := ' ENABLE REPLICA TRIGGER ';
else
raise exception 'Unknown trigger mode: %', tg.tgenabled;
end if;
if r_extra is not null then
sql := 'ALTER TABLE ' || fq_part || r_extra || quote_ident(tg.tgname);
execute sql;
end if;
end loop;
-- copy rules
for r in
select rw.rulename, rw.ev_enabled, pg_catalog.pg_get_ruledef(rw.oid) as definition
from pg_catalog.pg_rewrite rw
where rw.ev_class = parent_oid
and rw.rulename <> '_RETURN'::name
loop
-- try to skip rule name
r_extra := 'CREATE RULE ' || quote_ident(r.rulename) || ' AS';
r_sql := substr(r.definition, 1, char_length(r_extra));
if r_sql = r_extra then
r_sql := substr(r.definition, char_length(r_extra));
else
raise exception 'failed to match rule name';
end if;
-- no clue what name was used in defn, so find it from sql
r_oldtbl := substring(r_sql from ' TO (([[:alnum:]_.]+|"([^"]+|"")+")+)[[:space:]]');
if char_length(r_oldtbl) > 0 then
sql := replace(r.definition, r_oldtbl, fq_part);
else
raise exception 'failed to find original table name';
end if;
execute sql;
-- rule flags
r_extra := NULL;
if r.ev_enabled = 'R' then
r_extra = ' ENABLE REPLICA RULE ';
elsif r.ev_enabled = 'A' then
r_extra = ' ENABLE ALWAYS RULE ';
elsif r.ev_enabled = 'D' then
r_extra = ' DISABLE RULE ';
elsif r.ev_enabled <> 'O' then
raise exception 'unknown rule option: %', r.ev_enabled;
end if;
if r_extra is not null then
sql := 'ALTER TABLE ' || fq_part || r_extra
|| quote_ident(r.rulename);
execute sql;
end if;
end loop;
return 1;
end;
$$ language plpgsql;
create or replace function londiste.drop_obsolete_partitions
(
in i_parent_table text,
in i_retention_period interval,
in i_partition_period text
)
returns setof text
as $$
-------------------------------------------------------------------------------
-- Function: londiste.drop_obsolete_partitions(3)
--
-- Drop obsolete partitions of partition-by-date parent table.
--
-- Parameters:
-- i_parent_table Master table from which partitions are inherited
-- i_retention_period How long to keep partitions around
-- i_partition_period One of: year, month, day, hour
--
-- Returns:
-- Names of partitions dropped
-------------------------------------------------------------------------------
declare
_schema text not null := lower (split_part (i_parent_table, '.', 1));
_table text not null := lower (split_part (i_parent_table, '.', 2));
_part text;
_expr text;
_dfmt text;
begin
if i_partition_period in ('year', 'yearly') then
_expr := '_[0-9]{4}';
_dfmt := '_YYYY';
elsif i_partition_period in ('month', 'monthly') then
_expr := '_[0-9]{4}_[0-9]{2}';
_dfmt := '_YYYY_MM';
elsif i_partition_period in ('day', 'daily') then
_expr := '_[0-9]{4}_[0-9]{2}_[0-9]{2}';
_dfmt := '_YYYY_MM_DD';
elsif i_partition_period in ('hour', 'hourly') then
_expr := '_[0-9]{4}_[0-9]{2}_[0-9]{2}_[0-9]{2}';
_dfmt := '_YYYY_MM_DD_HH24';
else
raise exception 'not supported i_partition_period: %', i_partition_period;
end if;
if length (_table) = 0 then
_table := _schema;
_schema := 'public';
end if;
for _part in
select quote_ident (t.schemaname) ||'.'|| quote_ident (t.tablename)
from pg_catalog.pg_tables t
where t.schemaname = _schema
and t.tablename ~ ('^'|| _table || _expr ||'$')
and t.tablename < _table || to_char (now() - i_retention_period, _dfmt)
order by 1
loop
execute 'drop table '|| _part;
return next _part;
end loop;
end;
$$ language plpgsql;
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