199 lines
8.0 KiB
PL/PgSQL
199 lines
8.0 KiB
PL/PgSQL
---------------------------
|
|
-- FDW MANAGEMENT FUNCTIONS
|
|
--
|
|
-- All the FDW settings are read from the `cdb_conf.fdws` entry json file.
|
|
---------------------------
|
|
|
|
CREATE OR REPLACE FUNCTION cartodb._CDB_Setup_FDW(fdw_name text, config json)
|
|
RETURNS void
|
|
AS $$
|
|
DECLARE
|
|
row record;
|
|
option record;
|
|
org_role text;
|
|
BEGIN
|
|
-- This function tries to be as idempotent as possible, by not creating anything more than once
|
|
-- (not even using IF NOT EXIST to avoid throwing warnings)
|
|
IF NOT EXISTS ( SELECT * FROM pg_extension WHERE extname = 'postgres_fdw') THEN
|
|
CREATE EXTENSION postgres_fdw;
|
|
END IF;
|
|
-- Create FDW first if it does not exist
|
|
IF NOT EXISTS ( SELECT * FROM pg_foreign_server WHERE srvname = fdw_name)
|
|
THEN
|
|
EXECUTE FORMAT('CREATE SERVER %I FOREIGN DATA WRAPPER postgres_fdw', fdw_name);
|
|
END IF;
|
|
|
|
-- Set FDW settings
|
|
FOR row IN SELECT p.key, p.value from lateral json_each_text(config->'server') p
|
|
LOOP
|
|
IF NOT EXISTS (WITH a AS (select split_part(unnest(srvoptions), '=', 1) as options from pg_foreign_server where srvname=fdw_name) SELECT * from a where options = row.key)
|
|
THEN
|
|
EXECUTE FORMAT('ALTER SERVER %I OPTIONS (ADD %I %L)', fdw_name, row.key, row.value);
|
|
ELSE
|
|
EXECUTE FORMAT('ALTER SERVER %I OPTIONS (SET %I %L)', fdw_name, row.key, row.value);
|
|
END IF;
|
|
END LOOP;
|
|
|
|
-- Create user mappings
|
|
FOR row IN SELECT p.key, p.value from lateral json_each(config->'users') p LOOP
|
|
-- Check if entry on pg_user_mappings exists
|
|
|
|
IF NOT EXISTS ( SELECT * FROM pg_user_mappings WHERE srvname = fdw_name AND usename = row.key ) THEN
|
|
EXECUTE FORMAT ('CREATE USER MAPPING FOR %I SERVER %I', row.key, fdw_name);
|
|
END IF;
|
|
|
|
-- Update user mapping settings
|
|
FOR option IN SELECT o.key, o.value from lateral json_each_text(row.value) o LOOP
|
|
IF NOT EXISTS (WITH a AS (select split_part(unnest(umoptions), '=', 1) as options from pg_user_mappings WHERE srvname = fdw_name AND usename = row.key) SELECT * from a where options = option.key) THEN
|
|
EXECUTE FORMAT('ALTER USER MAPPING FOR %I SERVER %I OPTIONS (ADD %I %L)', row.key, fdw_name, option.key, option.value);
|
|
ELSE
|
|
EXECUTE FORMAT('ALTER USER MAPPING FOR %I SERVER %I OPTIONS (SET %I %L)', row.key, fdw_name, option.key, option.value);
|
|
END IF;
|
|
END LOOP;
|
|
END LOOP;
|
|
|
|
-- Create schema if it does not exist.
|
|
IF NOT EXISTS ( SELECT * from pg_namespace WHERE nspname=fdw_name) THEN
|
|
EXECUTE FORMAT ('CREATE SCHEMA %I', fdw_name);
|
|
END IF;
|
|
|
|
-- Give the organization role usage permisions over the schema
|
|
SELECT cartodb.CDB_Organization_Member_Group_Role_Member_Name() INTO org_role;
|
|
EXECUTE FORMAT ('GRANT USAGE ON SCHEMA %I TO %I', fdw_name, org_role);
|
|
|
|
-- Bring here the remote cdb_tablemetadata
|
|
IF NOT EXISTS ( SELECT * FROM PG_CLASS WHERE relnamespace = (SELECT oid FROM pg_namespace WHERE nspname=fdw_name) and relname='cdb_tablemetadata') THEN
|
|
EXECUTE FORMAT ('CREATE FOREIGN TABLE %I.cdb_tablemetadata (tabname regclass, updated_at timestamp with time zone) SERVER %I OPTIONS (table_name ''cdb_tablemetadata'', schema_name ''public'', updatable ''false'')', fdw_name, fdw_name);
|
|
END IF;
|
|
EXECUTE FORMAT ('GRANT SELECT ON %I.cdb_tablemetadata TO %I', fdw_name, org_role);
|
|
|
|
END
|
|
$$
|
|
LANGUAGE PLPGSQL;
|
|
|
|
CREATE OR REPLACE FUNCTION cartodb._CDB_Setup_FDWS()
|
|
RETURNS VOID AS
|
|
$$
|
|
DECLARE
|
|
row record;
|
|
BEGIN
|
|
FOR row IN SELECT p.key, p.value from lateral json_each(cartodb.CDB_Conf_GetConf('fdws')) p LOOP
|
|
EXECUTE 'SELECT cartodb._CDB_Setup_FDW($1, $2)' USING row.key, row.value;
|
|
END LOOP;
|
|
END
|
|
$$
|
|
LANGUAGE PLPGSQL;
|
|
|
|
|
|
CREATE OR REPLACE FUNCTION cartodb._CDB_Setup_FDW(fdw_name text)
|
|
RETURNS void AS
|
|
$BODY$
|
|
DECLARE
|
|
config json;
|
|
BEGIN
|
|
SELECT p.value FROM LATERAL json_each(cartodb.CDB_Conf_GetConf('fdws')) p WHERE p.key = fdw_name INTO config;
|
|
EXECUTE 'SELECT cartodb._CDB_Setup_FDW($1, $2)' USING fdw_name, config;
|
|
END
|
|
$BODY$
|
|
LANGUAGE plpgsql VOLATILE;
|
|
|
|
CREATE OR REPLACE FUNCTION cartodb.CDB_Add_Remote_Table(source text, table_name text)
|
|
RETURNS void AS
|
|
$$
|
|
BEGIN
|
|
PERFORM cartodb._CDB_Setup_FDW(source);
|
|
EXECUTE FORMAT ('IMPORT FOREIGN SCHEMA %I LIMIT TO (%I) FROM SERVER %I INTO %I;', source, table_name, source, source);
|
|
--- Grant SELECT to publicuser
|
|
EXECUTE FORMAT ('GRANT SELECT ON %I.%I TO publicuser;', source, table_name);
|
|
END
|
|
$$
|
|
LANGUAGE plpgsql;
|
|
|
|
CREATE OR REPLACE FUNCTION cartodb.CDB_Get_Foreign_Updated_At(foreign_table regclass)
|
|
RETURNS timestamp with time zone AS
|
|
$$
|
|
DECLARE
|
|
remote_table_name text;
|
|
fdw_schema_name text;
|
|
time timestamp with time zone;
|
|
BEGIN
|
|
-- This will turn a local foreign table (referenced as regclass) to its fully qualified text remote table reference.
|
|
WITH a AS (SELECT ftoptions FROM pg_foreign_table WHERE ftrelid=foreign_table LIMIT 1),
|
|
b as (SELECT (pg_options_to_table(ftoptions)).* FROM a)
|
|
SELECT FORMAT('%I.%I', (SELECT option_value FROM b WHERE option_name='schema_name'), (SELECT option_value FROM b WHERE option_name='table_name'))
|
|
INTO remote_table_name;
|
|
|
|
-- We assume that the remote cdb_tablemetadata is called cdb_tablemetadata and is on the same schema as the queried table.
|
|
SELECT nspname FROM pg_class c, pg_namespace n WHERE c.oid=foreign_table AND c.relnamespace = n.oid INTO fdw_schema_name;
|
|
EXECUTE FORMAT('SELECT updated_at FROM %I.cdb_tablemetadata WHERE tabname::text=%L ORDER BY updated_at DESC LIMIT 1', fdw_schema_name, remote_table_name) INTO time;
|
|
RETURN time;
|
|
END
|
|
$$
|
|
LANGUAGE plpgsql;
|
|
|
|
|
|
-- Return a set of (dbname, schema_name, table_name, updated_at)
|
|
-- It is aware of foreign tables
|
|
-- It assumes the local (schema_name, table_name) map to the remote ones with the same name
|
|
CREATE OR REPLACE FUNCTION cartodb.CDB_QueryTables_Updated_At(query text)
|
|
RETURNS TABLE(dbname text, schema_name text, table_name text, updated_at timestamptz)
|
|
AS $$
|
|
WITH query_tables AS (
|
|
SELECT unnest(CDB_QueryTablesText(query)) schema_table_name
|
|
), query_tables_oid AS (
|
|
SELECT schema_table_name, schema_table_name::regclass::oid AS reloid
|
|
FROM query_tables
|
|
),
|
|
fqtn AS (
|
|
SELECT
|
|
(CASE WHEN c.relkind = 'f' THEN cartodb._cdb_dbname_of_foreign_table(query_tables_oid.reloid)
|
|
ELSE current_database()
|
|
END)::text AS dbname,
|
|
n.nspname::text schema_name,
|
|
c.relname::text table_name,
|
|
c.relkind,
|
|
query_tables_oid.reloid
|
|
FROM query_tables_oid, pg_catalog.pg_class c
|
|
LEFT JOIN pg_catalog.pg_namespace n ON c.relnamespace = n.oid
|
|
WHERE c.oid = query_tables_oid.reloid
|
|
)
|
|
SELECT fqtn.dbname, fqtn.schema_name, fqtn.table_name,
|
|
(CASE WHEN relkind = 'f' THEN cartodb.CDB_Get_Foreign_Updated_At(reloid)
|
|
ELSE (SELECT md.updated_at FROM cartodb.CDB_TableMetadata md WHERE md.tabname = reloid)
|
|
END) AS updated_at
|
|
FROM fqtn;
|
|
$$ LANGUAGE SQL;
|
|
|
|
|
|
CREATE OR REPLACE FUNCTION cartodb._cdb_dbname_of_foreign_table(reloid oid)
|
|
RETURNS TEXT AS $$
|
|
SELECT option_value FROM pg_options_to_table((
|
|
|
|
SELECT fs.srvoptions
|
|
FROM pg_foreign_table ft
|
|
LEFT JOIN pg_foreign_server fs ON ft.ftserver = fs.oid
|
|
WHERE ft.ftrelid = reloid
|
|
|
|
)) WHERE option_name='dbname';
|
|
$$ LANGUAGE SQL;
|
|
|
|
|
|
-- Return the last updated time of a set of tables
|
|
-- It is aware of foreign tables
|
|
-- It assumes the local (schema_name, table_name) map to the remote ones with the same name
|
|
CREATE OR REPLACE FUNCTION cartodb.CDB_Last_Updated_Time(tables text[])
|
|
RETURNS timestamptz AS $$
|
|
WITH t AS (
|
|
SELECT unnest(tables) AS schema_table_name
|
|
), t_oid AS (
|
|
SELECT (t.schema_table_name)::regclass::oid as reloid FROM t
|
|
), t_updated_at AS (
|
|
SELECT
|
|
(CASE WHEN relkind = 'f' THEN cartodb.CDB_Get_Foreign_Updated_At(reloid)
|
|
ELSE (SELECT md.updated_at FROM cartodb.CDB_TableMetadata md WHERE md.tabname = reloid)
|
|
END) AS updated_at
|
|
FROM t_oid
|
|
LEFT JOIN pg_catalog.pg_class c ON c.oid = reloid
|
|
) SELECT max(updated_at) FROM t_updated_at;
|
|
$$ LANGUAGE SQL;
|