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216 lines
9.2 KiB
216 lines
9.2 KiB
---------------------------
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-- FDW MANAGEMENT FUNCTIONS
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--
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-- All the FDW settings are read from the `cdb_conf.fdws` entry json file.
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---------------------------
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CREATE OR REPLACE FUNCTION @extschema@._CDB_Setup_FDW(fdw_name text, config json)
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RETURNS void
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AS $$
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DECLARE
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row record;
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option record;
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org_role text;
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BEGIN
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-- This function tries to be as idempotent as possible, by not creating anything more than once
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-- (not even using IF NOT EXIST to avoid throwing warnings)
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IF NOT EXISTS ( SELECT * FROM pg_extension WHERE extname = 'postgres_fdw') THEN
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CREATE EXTENSION postgres_fdw;
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END IF;
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-- Create FDW first if it does not exist
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IF NOT EXISTS ( SELECT * FROM pg_foreign_server WHERE srvname = fdw_name)
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THEN
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EXECUTE FORMAT('CREATE SERVER %I FOREIGN DATA WRAPPER postgres_fdw', fdw_name);
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END IF;
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-- Set FDW settings
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FOR row IN SELECT p.key, p.value from lateral json_each_text(config->'server') p
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LOOP
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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)
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THEN
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EXECUTE FORMAT('ALTER SERVER %I OPTIONS (ADD %I %L)', fdw_name, row.key, row.value);
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ELSE
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EXECUTE FORMAT('ALTER SERVER %I OPTIONS (SET %I %L)', fdw_name, row.key, row.value);
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END IF;
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END LOOP;
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-- Create user mappings
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FOR row IN SELECT p.key, p.value from lateral json_each(config->'users') p LOOP
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-- Check if entry on pg_user_mappings exists
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IF NOT EXISTS ( SELECT * FROM pg_user_mappings WHERE srvname = fdw_name AND usename = row.key ) THEN
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EXECUTE FORMAT ('CREATE USER MAPPING FOR %I SERVER %I', row.key, fdw_name);
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END IF;
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-- Update user mapping settings
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FOR option IN SELECT o.key, o.value from lateral json_each_text(row.value) o LOOP
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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
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EXECUTE FORMAT('ALTER USER MAPPING FOR %I SERVER %I OPTIONS (ADD %I %L)', row.key, fdw_name, option.key, option.value);
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ELSE
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EXECUTE FORMAT('ALTER USER MAPPING FOR %I SERVER %I OPTIONS (SET %I %L)', row.key, fdw_name, option.key, option.value);
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END IF;
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END LOOP;
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END LOOP;
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-- Create schema if it does not exist.
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IF NOT EXISTS ( SELECT * from pg_namespace WHERE nspname=fdw_name) THEN
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EXECUTE FORMAT ('CREATE SCHEMA %I', fdw_name);
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END IF;
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-- Give the organization role usage permisions over the schema
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SELECT @extschema@.CDB_Organization_Member_Group_Role_Member_Name() INTO org_role;
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EXECUTE FORMAT ('GRANT USAGE ON SCHEMA %I TO %I', fdw_name, org_role);
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-- Bring here the remote cdb_tablemetadata
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IF NOT EXISTS ( SELECT * FROM PG_CLASS WHERE relnamespace = (SELECT oid FROM pg_namespace WHERE nspname=fdw_name) and relname='cdb_tablemetadata') THEN
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EXECUTE FORMAT ('CREATE FOREIGN TABLE %I.cdb_tablemetadata (tabname text, updated_at timestamp with time zone) SERVER %I OPTIONS (table_name ''cdb_tablemetadata_text'', schema_name ''@extschema@'', updatable ''false'')', fdw_name, fdw_name);
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END IF;
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EXECUTE FORMAT ('GRANT SELECT ON %I.cdb_tablemetadata TO %I', fdw_name, org_role);
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END
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$$
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LANGUAGE PLPGSQL VOLATILE PARALLEL UNSAFE;
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CREATE OR REPLACE FUNCTION @extschema@._CDB_Setup_FDWS()
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RETURNS VOID AS
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$$
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DECLARE
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row record;
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BEGIN
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FOR row IN SELECT p.key, p.value from lateral json_each(@extschema@.CDB_Conf_GetConf('fdws')) p LOOP
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EXECUTE 'SELECT @extschema@._CDB_Setup_FDW($1, $2)' USING row.key, row.value;
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END LOOP;
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END
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$$
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LANGUAGE PLPGSQL VOLATILE PARALLEL UNSAFE;
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CREATE OR REPLACE FUNCTION @extschema@._CDB_Setup_FDW(fdw_name text)
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RETURNS void AS
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$BODY$
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DECLARE
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config json;
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BEGIN
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SELECT p.value FROM LATERAL json_each(@extschema@.CDB_Conf_GetConf('fdws')) p WHERE p.key = fdw_name INTO config;
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EXECUTE 'SELECT @extschema@._CDB_Setup_FDW($1, $2)' USING fdw_name, config;
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END
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$BODY$
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LANGUAGE plpgsql VOLATILE PARALLEL UNSAFE;
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CREATE OR REPLACE FUNCTION @extschema@.CDB_Add_Remote_Table(source text, table_name text)
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RETURNS void AS
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$$
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BEGIN
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PERFORM @extschema@._CDB_Setup_FDW(source);
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EXECUTE FORMAT ('IMPORT FOREIGN SCHEMA %I LIMIT TO (%I) FROM SERVER %I INTO %I;', source, table_name, source, source);
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--- Grant SELECT to publicuser
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EXECUTE FORMAT ('GRANT SELECT ON %I.%I TO publicuser;', source, table_name);
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END
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$$
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LANGUAGE plpgsql VOLATILE PARALLEL UNSAFE;
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CREATE OR REPLACE FUNCTION @extschema@.CDB_Get_Foreign_Updated_At(foreign_table regclass)
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RETURNS timestamp with time zone AS
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$$
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DECLARE
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remote_table_name text;
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fdw_schema_name text;
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time timestamp with time zone;
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BEGIN
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-- This will turn a local foreign table (referenced as regclass) to its fully qualified text remote table reference.
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WITH a AS (SELECT ftoptions FROM pg_foreign_table WHERE ftrelid=foreign_table LIMIT 1),
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b as (SELECT (pg_options_to_table(ftoptions)).* FROM a)
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SELECT FORMAT('%I.%I', (SELECT option_value FROM b WHERE option_name='schema_name'), (SELECT option_value FROM b WHERE option_name='table_name'))
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INTO remote_table_name;
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-- We assume that the remote cdb_tablemetadata is called cdb_tablemetadata and is on the same schema as the queried table.
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SELECT nspname FROM pg_class c, pg_namespace n WHERE c.oid=foreign_table AND c.relnamespace = n.oid INTO fdw_schema_name;
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BEGIN
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EXECUTE FORMAT('SELECT updated_at FROM %I.cdb_tablemetadata WHERE tabname=%L ORDER BY updated_at DESC LIMIT 1', fdw_schema_name, remote_table_name) INTO time;
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EXCEPTION
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WHEN undefined_table THEN
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-- If you add a GET STACKED DIAGNOSTICS text_var = RETURNED_SQLSTATE
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-- you get a code 42P01 which corresponds to undefined_table
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RAISE NOTICE 'CDB_Get_Foreign_Updated_At: could not find %.cdb_tablemetadata while checking % updated_at, returning NULL timestamp', fdw_schema_name, foreign_table;
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END;
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RETURN time;
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END
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$$
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LANGUAGE plpgsql VOLATILE PARALLEL UNSAFE;
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CREATE OR REPLACE FUNCTION @extschema@._cdb_dbname_of_foreign_table(reloid oid)
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RETURNS TEXT AS $$
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SELECT option_value FROM pg_options_to_table((
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SELECT fs.srvoptions
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FROM pg_foreign_table ft
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LEFT JOIN pg_foreign_server fs ON ft.ftserver = fs.oid
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WHERE ft.ftrelid = reloid
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)) WHERE option_name='dbname';
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$$ LANGUAGE SQL VOLATILE PARALLEL UNSAFE;
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-- Return a set of (dbname, schema_name, table_name, updated_at)
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-- It is aware of foreign tables
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-- It assumes the local (schema_name, table_name) map to the remote ones with the same name
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-- Note: dbname is never quoted whereas schema and table names are when needed.
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CREATE OR REPLACE FUNCTION @extschema@.CDB_QueryTables_Updated_At(query text)
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RETURNS TABLE(dbname text, schema_name text, table_name text, updated_at timestamptz)
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AS $$
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WITH query_tables AS (
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SELECT unnest(@extschema@.CDB_QueryTablesText(query)) schema_table_name
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), query_tables_oid AS (
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SELECT schema_table_name, schema_table_name::regclass::oid AS reloid
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FROM query_tables
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),
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fqtn AS (
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SELECT
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(CASE WHEN c.relkind = 'f' THEN @extschema@._cdb_dbname_of_foreign_table(query_tables_oid.reloid)
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ELSE current_database()
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END)::text AS dbname,
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quote_ident(n.nspname::text) schema_name,
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quote_ident(c.relname::text) table_name,
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c.relkind,
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query_tables_oid.reloid
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FROM query_tables_oid, pg_catalog.pg_class c
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LEFT JOIN pg_catalog.pg_namespace n ON c.relnamespace = n.oid
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WHERE c.oid = query_tables_oid.reloid
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)
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SELECT fqtn.dbname, fqtn.schema_name, fqtn.table_name,
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(CASE WHEN relkind = 'f' THEN @extschema@.CDB_Get_Foreign_Updated_At(reloid)
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ELSE (SELECT md.updated_at FROM @extschema@.CDB_TableMetadata md WHERE md.tabname = reloid)
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END) AS updated_at
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FROM fqtn;
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$$ LANGUAGE SQL VOLATILE PARALLEL UNSAFE;
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-- Return the last updated time of a set of tables
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-- It is aware of foreign tables
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-- It assumes the local (schema_name, table_name) map to the remote ones with the same name
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CREATE OR REPLACE FUNCTION @extschema@.CDB_Last_Updated_Time(tables text[])
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RETURNS timestamptz AS $$
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WITH t AS (
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SELECT unnest(tables) AS schema_table_name
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), t_oid AS (
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SELECT (t.schema_table_name)::regclass::oid as reloid FROM t
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), t_updated_at AS (
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SELECT
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(CASE WHEN relkind = 'f' THEN @extschema@.CDB_Get_Foreign_Updated_At(reloid)
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ELSE (SELECT md.updated_at FROM @extschema@.CDB_TableMetadata md WHERE md.tabname = reloid)
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END) AS updated_at
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FROM t_oid
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LEFT JOIN pg_catalog.pg_class c ON c.oid = reloid
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) SELECT max(updated_at) FROM t_updated_at;
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$$ LANGUAGE SQL VOLATILE PARALLEL UNSAFE;
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--------------------------------------------------------------------------------
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-- Deprecated
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--------------------------------------------------------------------------------
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DROP FUNCTION IF EXISTS @extschema@.__CDB_User_FDW_Object_Names(name);
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DROP FUNCTION IF EXISTS @extschema@._CDB_SetUp_User_PG_FDW_Server(name, json);
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DROP FUNCTION IF EXISTS @extschema@._CDB_Drop_User_PG_FDW_Server(name, boolean);
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DROP FUNCTION IF EXISTS @extschema@.CDB_SetUp_User_PG_FDW_Table(name, name, name);
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