/usr/share/postgresql/9.5/extension/mimeo--0.12.0--0.12.1.sql is in postgresql-9.5-mimeo 1.4.1-1.
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-- Simplified exception blocks and made some error messages clearer in refresh functions.
-- Added some simple exception block pgTAP tests.
/*
* Refresh based on DML (Insert, Update, Delete)
*/
CREATE OR REPLACE FUNCTION refresh_dml(p_destination text, p_limit int default NULL, p_repull boolean DEFAULT false, p_debug boolean DEFAULT false) RETURNS void
LANGUAGE plpgsql SECURITY DEFINER
AS $$
DECLARE
v_adv_lock boolean;
v_batch_limit_reached boolean := false;
v_cols_n_types text;
v_cols text;
v_condition text;
v_control text;
v_dblink int;
v_dblink_name text;
v_dblink_schema text;
v_delete_sql text;
v_dest_table text;
v_exec_status text;
v_fetch_sql text;
v_field text;
v_filter text[];
v_insert_sql text;
v_job_id int;
v_jobmon_schema text;
v_job_name text;
v_limit int;
v_link_exists boolean;
v_old_search_path text;
v_pk_counter int;
v_pk_name_csv text;
v_pk_name_type_csv text := '';
v_pk_name text[];
v_pk_type text[];
v_pk_where text := '';
v_remote_f_sql text;
v_remote_q_sql text;
v_rowcount bigint := 0;
v_source_table text;
v_step_id int;
v_tmp_table text;
v_total bigint := 0;
v_trigger_delete text;
v_trigger_update text;
v_truncate_remote_q text;
v_with_update text;
BEGIN
IF p_debug IS DISTINCT FROM true THEN
PERFORM set_config( 'client_min_messages', 'warning', true );
END IF;
v_job_name := 'Refresh DML: '||p_destination;
v_dblink_name := 'mimeo_dml_refresh_'||p_destination;
SELECT nspname INTO v_dblink_schema FROM pg_namespace n, pg_extension e WHERE e.extname = 'dblink' AND e.extnamespace = n.oid;
SELECT nspname INTO v_jobmon_schema FROM pg_namespace n, pg_extension e WHERE e.extname = 'pg_jobmon' AND e.extnamespace = n.oid;
-- Set custom search path to allow easier calls to other functions, especially job logging
SELECT current_setting('search_path') INTO v_old_search_path;
EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||','||v_dblink_schema||',public'',''false'')';
-- Take advisory lock to prevent multiple calls to function overlapping
v_adv_lock := pg_try_advisory_lock(hashtext('refresh_dml'), hashtext(v_job_name));
IF v_adv_lock = 'false' THEN
v_job_id := add_job(v_job_name);
v_step_id := add_step(v_job_id,'Obtaining advisory lock for job: '||v_job_name);
PERFORM gdb(p_debug,'Obtaining advisory lock FAILED for job: '||v_job_name);
PERFORM update_step(v_step_id, 'WARNING','Found concurrent job. Exiting gracefully');
PERFORM fail_job(v_job_id, 2);
EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
RETURN;
END IF;
SELECT source_table
, dest_table
, 'tmp_'||replace(dest_table,'.','_')
, dblink
, control
, pk_name
, pk_type
, filter
, condition
, batch_limit
FROM refresh_config_dml
WHERE dest_table = p_destination INTO
v_source_table
, v_dest_table
, v_tmp_table
, v_dblink
, v_control
, v_pk_name
, v_pk_type
, v_filter
, v_condition
, v_limit;
IF NOT FOUND THEN
RAISE EXCEPTION 'No configuration found for %',v_job_name;
END IF;
v_job_id := add_job(v_job_name);
PERFORM gdb(p_debug,'Job ID: '||v_job_id::text);
v_step_id := add_step(v_job_id,'Sanity check primary/unique key values');
IF v_pk_name IS NULL OR v_pk_type IS NULL THEN
RAISE EXCEPTION 'Primary key fields in refresh_config_dml must be defined';
END IF;
-- determine column list, column type list
IF v_filter IS NULL THEN
SELECT array_to_string(array_agg(attname),','), array_to_string(array_agg(attname||' '||format_type(atttypid, atttypmod)::text),',')
INTO v_cols, v_cols_n_types
FROM pg_attribute WHERE attrelid = p_destination::regclass AND attnum > 0 AND attisdropped is false;
ELSE
-- ensure all primary key columns are included in any column filters
FOREACH v_field IN ARRAY v_pk_name LOOP
IF v_field = ANY(v_filter) THEN
CONTINUE;
ELSE
RAISE EXCEPTION 'Filter list did not contain all columns that compose primary/unique key for %',v_job_name;
END IF;
END LOOP;
SELECT array_to_string(array_agg(attname),','), array_to_string(array_agg(attname||' '||format_type(atttypid, atttypmod)::text),',')
INTO v_cols, v_cols_n_types
FROM pg_attribute WHERE attrelid = p_destination::regclass AND ARRAY[attname::text] <@ v_filter AND attnum > 0 AND attisdropped is false;
END IF;
IF p_limit IS NOT NULL THEN
v_limit := p_limit;
END IF;
v_pk_name_csv := array_to_string(v_pk_name, ',');
v_pk_counter := 1;
WHILE v_pk_counter <= array_length(v_pk_name,1) LOOP
IF v_pk_counter > 1 THEN
v_pk_name_type_csv := v_pk_name_type_csv || ', ';
v_pk_where := v_pk_where ||' AND ';
END IF;
v_pk_name_type_csv := v_pk_name_type_csv ||v_pk_name[v_pk_counter]||' '||v_pk_type[v_pk_counter];
v_pk_where := v_pk_where || ' a.'||v_pk_name[v_pk_counter]||' = b.'||v_pk_name[v_pk_counter];
v_pk_counter := v_pk_counter + 1;
END LOOP;
PERFORM update_step(v_step_id, 'OK','Done');
PERFORM dblink_connect(v_dblink_name, auth(v_dblink));
-- update remote entries
v_step_id := add_step(v_job_id,'Updating remote trigger table');
v_with_update := 'WITH a AS (SELECT '||v_pk_name_csv||' FROM '|| v_control ||' ORDER BY '||v_pk_name_csv||' LIMIT '|| COALESCE(v_limit::text, 'ALL') ||') UPDATE '||v_control||' b SET processed = true FROM a WHERE '||v_pk_where;
v_trigger_update := 'SELECT dblink_exec('||quote_literal(v_dblink_name)||','|| quote_literal(v_with_update)||')';
PERFORM gdb(p_debug,v_trigger_update);
EXECUTE v_trigger_update INTO v_exec_status;
PERFORM update_step(v_step_id, 'OK','Result was '||v_exec_status);
IF p_repull THEN
-- Do truncate of remote queue table here before full data pull is actually started to ensure all new changes are recorded
PERFORM update_step(v_step_id, 'OK','Request to repull ALL data from source. This could take a while...');
PERFORM gdb(p_debug, 'Request to repull ALL data from source. This could take a while...');
v_truncate_remote_q := 'SELECT dblink_exec('||quote_literal(v_dblink_name)||','||quote_literal('TRUNCATE TABLE '||v_control)||')';
EXECUTE v_truncate_remote_q;
v_step_id := add_step(v_job_id,'Truncating local table');
PERFORM gdb(p_debug,'Truncating local table');
EXECUTE 'TRUNCATE '||v_dest_table;
PERFORM update_step(v_step_id, 'OK','Done');
-- Define cursor query
v_remote_f_sql := 'SELECT '||v_cols||' FROM '||v_source_table;
IF v_condition IS NOT NULL THEN
v_remote_f_sql := v_remote_f_sql || ' ' || v_condition;
END IF;
ELSE
EXECUTE 'CREATE TEMP TABLE '||v_tmp_table||'_queue ('||v_pk_name_type_csv||', PRIMARY KEY ('||v_pk_name_csv||'))';
-- Copy queue locally for use in removing updated/deleted rows
v_remote_q_sql := 'SELECT DISTINCT '||v_pk_name_csv||' FROM '||v_control||' WHERE processed = true';
PERFORM dblink_open(v_dblink_name, 'mimeo_cursor', v_remote_q_sql);
v_step_id := add_step(v_job_id, 'Creating local queue temp table');
v_rowcount := 0;
LOOP
v_fetch_sql := 'INSERT INTO '||v_tmp_table||'_queue ('||v_pk_name_csv||')
SELECT '||v_pk_name_csv||' FROM dblink_fetch('||quote_literal(v_dblink_name)||', ''mimeo_cursor'', 50000) AS ('||v_pk_name_type_csv||')';
EXECUTE v_fetch_sql;
GET DIAGNOSTICS v_rowcount = ROW_COUNT;
EXIT WHEN v_rowcount = 0;
v_total := v_total + coalesce(v_rowcount, 0);
PERFORM gdb(p_debug,'Fetching rows in batches: '||v_total||' done so far.');
PERFORM update_step(v_step_id, 'PENDING', 'Fetching rows in batches: '||v_total||' done so far.');
END LOOP;
PERFORM dblink_close(v_dblink_name, 'mimeo_cursor');
EXECUTE 'CREATE INDEX ON '||v_tmp_table||'_queue ('||v_pk_name_csv||')';
EXECUTE 'ANALYZE '||v_tmp_table||'_queue';
PERFORM update_step(v_step_id, 'OK','Number of rows inserted: '||v_total);
PERFORM gdb(p_debug,'Temp queue table row count '||v_total::text);
v_step_id := add_step(v_job_id,'Deleting records from local table');
v_delete_sql := 'DELETE FROM '||v_dest_table||' a USING '||v_tmp_table||'_queue b WHERE '|| v_pk_where;
PERFORM gdb(p_debug,v_delete_sql);
EXECUTE v_delete_sql;
GET DIAGNOSTICS v_rowcount = ROW_COUNT;
PERFORM gdb(p_debug,'Rows removed from local table before applying changes: '||v_rowcount::text);
PERFORM update_step(v_step_id, 'OK','Removed '||v_rowcount||' records');
-- Define cursor query
v_remote_f_sql := 'SELECT '||v_cols||' FROM '||v_source_table||' JOIN ('||v_remote_q_sql||') x USING ('||v_pk_name_csv||')';
IF v_condition IS NOT NULL THEN
v_remote_f_sql := v_remote_f_sql || ' ' || v_condition;
END IF;
END IF;
-- insert records to local table. Have to do temp table in case destination table is partitioned (returns 0 when inserting to parent)
PERFORM dblink_open(v_dblink_name, 'mimeo_cursor', v_remote_f_sql);
v_step_id := add_step(v_job_id, 'Inserting new records into local table');
EXECUTE 'CREATE TEMP TABLE '||v_tmp_table||'_full ('||v_cols_n_types||')';
v_rowcount := 0;
v_total := 0;
LOOP
v_fetch_sql := 'INSERT INTO '||v_tmp_table||'_full ('||v_cols||')
SELECT '||v_cols||' FROM dblink_fetch('||quote_literal(v_dblink_name)||', ''mimeo_cursor'', 50000) AS ('||v_cols_n_types||')';
EXECUTE v_fetch_sql;
GET DIAGNOSTICS v_rowcount = ROW_COUNT;
v_total := v_total + coalesce(v_rowcount, 0);
EXECUTE 'INSERT INTO '||v_dest_table||' ('||v_cols||') SELECT '||v_cols||' FROM '||v_tmp_table||'_full';
EXECUTE 'TRUNCATE '||v_tmp_table||'_full';
EXIT WHEN v_rowcount = 0;
PERFORM gdb(p_debug,'Fetching rows in batches: '||v_total||' done so far.');
PERFORM update_step(v_step_id, 'PENDING', 'Fetching rows in batches: '||v_total||' done so far.');
END LOOP;
PERFORM dblink_close(v_dblink_name, 'mimeo_cursor');
PERFORM update_step(v_step_id, 'OK','Number of rows inserted: '||v_total);
IF p_repull = false AND v_total > (v_limit * .75) THEN
v_step_id := add_step(v_job_id, 'Row count warning');
PERFORM update_step(v_step_id, 'WARNING','Row count fetched ('||v_total||') greater than 75% of batch limit ('||v_limit||'). Recommend increasing batch limit if possible.');
v_batch_limit_reached := true;
END IF;
-- clean out rows from txn table
v_step_id := add_step(v_job_id,'Cleaning out rows from txn table');
v_trigger_delete := 'SELECT dblink_exec('||quote_literal(v_dblink_name)||','||quote_literal('DELETE FROM '||v_control||' WHERE processed = true')||')';
PERFORM gdb(p_debug,v_trigger_delete);
EXECUTE v_trigger_delete INTO v_exec_status;
PERFORM update_step(v_step_id, 'OK','Result was '||v_exec_status);
-- update activity status
v_step_id := add_step(v_job_id,'Updating last_run in config table');
UPDATE refresh_config_dml SET last_run = CURRENT_TIMESTAMP WHERE dest_table = p_destination;
PERFORM update_step(v_step_id, 'OK','Last run was '||CURRENT_TIMESTAMP);
EXECUTE 'DROP TABLE IF EXISTS '||v_tmp_table||'_full';
EXECUTE 'DROP TABLE IF EXISTS '||v_tmp_table||'_queue';
PERFORM dblink_disconnect(v_dblink_name);
IF v_batch_limit_reached = false THEN
PERFORM close_job(v_job_id);
ELSE
-- Set final job status to level 2 (WARNING) to bring notice that the batch limit was reached and may need adjusting.
-- Preventive warning to keep replication from falling behind.
PERFORM fail_job(v_job_id, 2);
END IF;
-- Ensure old search path is reset for the current session
EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
PERFORM pg_advisory_unlock(hashtext('refresh_dml'), hashtext(v_job_name));
EXCEPTION
WHEN QUERY_CANCELED THEN
EXECUTE 'SELECT '||v_dblink_schema||'.dblink_get_connections() @> ARRAY['||quote_literal(v_dblink_name)||']' INTO v_link_exists;
IF v_link_exists THEN
EXECUTE 'SELECT '||v_dblink_schema||'.dblink_disconnect('||quote_literal(v_dblink_name)||')';
END IF;
PERFORM pg_advisory_unlock(hashtext('refresh_dml'), hashtext(v_job_name));
RAISE EXCEPTION '%', SQLERRM;
WHEN OTHERS THEN
IF v_job_id IS NULL THEN
EXECUTE 'SELECT '||v_jobmon_schema||'.add_job(''Refresh DML: '||p_destination||''')' INTO v_job_id;
EXECUTE 'SELECT '||v_jobmon_schema||'.add_step('||v_job_id||', ''EXCEPTION before job logging started'')' INTO v_step_id;
END IF;
IF v_step_id IS NULL THEN
EXECUTE 'SELECT '||v_jobmon_schema||'.add_step('||v_job_id||', ''EXCEPTION before first step logged'')' INTO v_step_id;
END IF;
EXECUTE 'SELECT '||v_dblink_schema||'.dblink_get_connections() @> ARRAY['||quote_literal(v_dblink_name)||']' INTO v_link_exists;
IF v_link_exists THEN
EXECUTE 'SELECT '||v_dblink_schema||'.dblink_disconnect('||quote_literal(v_dblink_name)||')';
END IF;
EXECUTE 'SELECT '||v_jobmon_schema||'.update_step('||v_step_id||', ''CRITICAL'', ''ERROR: '||coalesce(SQLERRM,'unknown')||''')';
EXECUTE 'SELECT '||v_jobmon_schema||'.fail_job('||v_job_id||')';
PERFORM pg_advisory_unlock(hashtext('refresh_dml'), hashtext(v_job_name));
RAISE EXCEPTION '%', SQLERRM;
END
$$;
/*
* Refresh insert only table based on timestamp control field
*/
CREATE OR REPLACE FUNCTION refresh_inserter(p_destination text, p_limit integer DEFAULT NULL, p_repull boolean DEFAULT false, p_repull_start text DEFAULT NULL, p_repull_end text DEFAULT NULL, p_debug boolean DEFAULT false) RETURNS void
LANGUAGE plpgsql SECURITY DEFINER
AS $$
DECLARE
v_adv_lock boolean;
v_batch_limit_reached int := 0;
v_boundary timestamptz;
v_cols_n_types text;
v_cols text;
v_condition text;
v_control text;
v_create_sql text;
v_dblink int;
v_dblink_name text;
v_dblink_schema text;
v_delete_sql text;
v_dest_table text;
v_dst_active boolean;
v_dst_check boolean;
v_dst_start int;
v_dst_end int;
v_fetch_sql text;
v_filter text[];
v_full_refresh boolean := false;
v_insert_sql text;
v_job_id int;
v_jobmon_schema text;
v_job_name text;
v_last_fetched timestamptz;
v_last_value timestamptz;
v_limit int;
v_link_exists boolean;
v_now timestamptz := now();
v_old_search_path text;
v_remote_sql text;
v_rowcount bigint := 0;
v_source_table text;
v_step_id int;
v_tmp_table text;
v_total bigint := 0;
BEGIN
IF p_debug IS DISTINCT FROM true THEN
PERFORM set_config( 'client_min_messages', 'warning', true );
END IF;
v_job_name := 'Refresh Inserter: '||p_destination;
v_dblink_name := 'mimeo_inserter_refresh_'||p_destination;
SELECT nspname INTO v_dblink_schema FROM pg_namespace n, pg_extension e WHERE e.extname = 'dblink' AND e.extnamespace = n.oid;
SELECT nspname INTO v_jobmon_schema FROM pg_namespace n, pg_extension e WHERE e.extname = 'pg_jobmon' AND e.extnamespace = n.oid;
-- Set custom search path to allow easier calls to other functions, especially job logging
SELECT current_setting('search_path') INTO v_old_search_path;
EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||','||v_dblink_schema||',public'',''false'')';
-- Take advisory lock to prevent multiple calls to function overlapping
v_adv_lock := pg_try_advisory_lock(hashtext('refresh_inserter'), hashtext(v_job_name));
IF v_adv_lock = 'false' THEN
v_job_id := add_job(v_job_name);
v_step_id := add_step(v_job_id,'Obtaining advisory lock for job: '||v_job_name);
PERFORM gdb(p_debug,'Obtaining advisory lock FAILED for job: '||v_job_name);
PERFORM update_step(v_step_id, 'WARNING','Found concurrent job. Exiting gracefully');
PERFORM fail_job(v_job_id, 2);
EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
RETURN;
END IF;
v_job_id := add_job(v_job_name);
PERFORM gdb(p_debug,'Job ID: '||v_job_id::text);
SELECT source_table
, dest_table
, 'tmp_'||replace(dest_table,'.','_')
, dblink
, control
, last_value
, now() - boundary::interval
, filter
, condition
, dst_active
, dst_start
, dst_end
, batch_limit
FROM refresh_config_inserter WHERE dest_table = p_destination
INTO v_source_table
, v_dest_table
, v_tmp_table
, v_dblink
, v_control
, v_last_value
, v_boundary
, v_filter
, v_condition
, v_dst_active
, v_dst_start
, v_dst_end
, v_limit;
IF NOT FOUND THEN
RAISE EXCEPTION 'No configuration found for %',v_job_name;
END IF;
-- Do not allow this function to run during DST time change if config option is true. Otherwise will miss data from source
IF v_dst_active THEN
v_dst_check := @extschema@.dst_change(v_now);
IF v_dst_check THEN
IF to_number(to_char(v_now, 'HH24MM'), '0000') > v_dst_start AND to_number(to_char(v_now, 'HH24MM'), '0000') < v_dst_end THEN
v_step_id := add_step( v_job_id, 'DST Check');
PERFORM update_step(v_step_id, 'OK', 'Job CANCELLED - Does not run during DST time change');
PERFORM close_job(v_job_id);
PERFORM gdb(p_debug, 'Cannot run during DST time change');
UPDATE refresh_config_inserter SET last_run = CURRENT_TIMESTAMP WHERE dest_table = p_destination;
EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
PERFORM pg_advisory_unlock(hashtext('refresh_inserter'), hashtext(v_job_name));
RETURN;
END IF;
END IF;
END IF;
v_step_id := add_step(v_job_id,'Building SQL');
IF v_filter IS NULL THEN
SELECT array_to_string(array_agg(attname),','), array_to_string(array_agg(attname||' '||format_type(atttypid, atttypmod)::text),',')
INTO v_cols, v_cols_n_types
FROM pg_attribute WHERE attrelid = p_destination::regclass AND attnum > 0 AND attisdropped is false;
ELSE
SELECT array_to_string(array_agg(attname),','), array_to_string(array_agg(attname||' '||format_type(atttypid, atttypmod)::text),',')
INTO v_cols, v_cols_n_types
FROM pg_attribute WHERE attrelid = p_destination::regclass AND ARRAY[attname::text] <@ v_filter AND attnum > 0 AND attisdropped is false;
END IF;
PERFORM dblink_connect(v_dblink_name, auth(v_dblink));
IF p_limit IS NOT NULL THEN
v_limit := p_limit;
END IF;
IF p_repull THEN
-- Repull ALL data if no start and end values set
IF p_repull_start IS NULL AND p_repull_end IS NULL THEN
PERFORM update_step(v_step_id, 'OK','Request to repull ALL data from source. This could take a while...');
EXECUTE 'TRUNCATE '||v_dest_table;
v_remote_sql := 'SELECT '||v_cols||' FROM '||v_source_table;
IF v_condition IS NOT NULL THEN
v_remote_sql := v_remote_sql || ' ' || v_condition;
END IF;
ELSE
PERFORM update_step(v_step_id, 'OK','Request to repull data from '||COALESCE(p_repull_start, '-infinity')||' to '||COALESCE(p_repull_end, 'infinity'));
PERFORM gdb(p_debug,'Request to repull data from '||COALESCE(p_repull_start, '-infinity')||' to '||COALESCE(p_repull_end, 'infinity'));
v_remote_sql := 'SELECT '||v_cols||' FROM '||v_source_table;
IF v_condition IS NOT NULL THEN
v_remote_sql := v_remote_sql || ' ' || v_condition || ' AND ';
ELSE
v_remote_sql := v_remote_sql || ' WHERE ';
END IF;
v_remote_sql := v_remote_sql ||v_control||' > '||quote_literal(COALESCE(p_repull_start, '-infinity'))||' AND '
||v_control||' < '||quote_literal(COALESCE(p_repull_end, 'infinity'));
-- Delete the old local data
v_delete_sql := 'DELETE FROM '||v_dest_table||' WHERE '||v_control||' > '||quote_literal(COALESCE(p_repull_start, '-infinity'))||' AND '
||v_control||' < '||quote_literal(COALESCE(p_repull_end, 'infinity'));
v_step_id := add_step(v_job_id, 'Deleting current, local data');
PERFORM gdb(p_debug,'Deleting current, local data: '||v_delete_sql);
EXECUTE v_delete_sql;
GET DIAGNOSTICS v_rowcount = ROW_COUNT;
PERFORM update_step(v_step_id, 'OK', v_rowcount || 'rows removed');
END IF;
ELSE
-- does < for upper boundary to keep missing data from happening on rare edge case where a newly inserted row outside the transaction batch
-- has the exact same timestamp as the previous batch's max timestamp
v_remote_sql := 'SELECT '||v_cols||' FROM '||v_source_table;
IF v_condition IS NOT NULL THEN
v_remote_sql := v_remote_sql || ' ' || v_condition || ' AND ';
ELSE
v_remote_sql := v_remote_sql || ' WHERE ';
END IF;
v_remote_sql := v_remote_sql ||v_control||' > '||quote_literal(v_last_value)||' AND '||v_control||' < '||quote_literal(v_boundary)||' ORDER BY '||v_control||' ASC LIMIT '|| COALESCE(v_limit::text, 'ALL');
PERFORM update_step(v_step_id, 'OK','Grabbing rows from '||v_last_value::text||' to '||v_boundary::text);
PERFORM gdb(p_debug,'Grabbing rows from '||v_last_value::text||' to '||v_boundary::text);
END IF;
EXECUTE 'CREATE TEMP TABLE '||v_tmp_table||' ('||v_cols_n_types||')';
PERFORM gdb(p_debug,v_remote_sql);
PERFORM dblink_open(v_dblink_name, 'mimeo_cursor', v_remote_sql);
v_step_id := add_step(v_job_id, 'Inserting new records into local table');
v_rowcount := 0;
v_total := 0;
LOOP
v_fetch_sql := 'INSERT INTO '||v_tmp_table||'('||v_cols||')
SELECT '||v_cols||' FROM dblink_fetch('||quote_literal(v_dblink_name)||', ''mimeo_cursor'', 50000) AS ('||v_cols_n_types||')';
EXECUTE v_fetch_sql;
GET DIAGNOSTICS v_rowcount = ROW_COUNT;
v_total := v_total + coalesce(v_rowcount, 0);
EXECUTE 'SELECT max('||v_control||') FROM '||v_tmp_table INTO v_last_fetched;
IF v_limit IS NULL THEN -- insert into the real table in batches if no limit to avoid excessively large temp tables
EXECUTE 'INSERT INTO '||v_dest_table||' ('||v_cols||') SELECT '||v_cols||' FROM '||v_tmp_table;
EXECUTE 'TRUNCATE '||v_tmp_table;
END IF;
EXIT WHEN v_rowcount = 0;
PERFORM gdb(p_debug,'Fetching rows in batches: '||v_total||' done so far. Last fetched: '||v_last_fetched);
PERFORM update_step(v_step_id, 'PENDING', 'Fetching rows in batches: '||v_total||' done so far. Last fetched: '||v_last_fetched);
END LOOP;
PERFORM dblink_close(v_dblink_name, 'mimeo_cursor');
PERFORM update_step(v_step_id, 'OK','Rows fetched: '||v_total);
IF v_limit IS NULL THEN
-- nothing else to do
ELSE
-- When using batch limits, entire batch must be pulled to temp table before inserting to real table to catch edge cases
v_step_id := add_step(v_job_id,'Checking for batch limit issues');
PERFORM gdb(p_debug, 'Checking for batch limit issues');
-- Not recommended that the batch actually equal the limit set if possible. Handle all edge cases to keep data consistent
IF v_total >= v_limit THEN
PERFORM update_step(v_step_id, 'WARNING','Row count fetched equal to or greater than limit set: '||v_limit||'. Recommend increasing batch limit if possible.');
PERFORM gdb(p_debug, 'Row count fetched equal to or greater than limit set: '||v_limit||'. Recommend increasing batch limit if possible.');
EXECUTE 'SELECT max('||v_control||') FROM '||v_tmp_table INTO v_last_value;
v_step_id := add_step(v_job_id, 'Removing high boundary rows from this batch to avoid missing data');
EXECUTE 'DELETE FROM '||v_tmp_table||' WHERE '||v_control||' = '||quote_literal(v_last_value);
GET DIAGNOSTICS v_rowcount = ROW_COUNT;
PERFORM update_step(v_step_id, 'OK', 'Removed '||v_rowcount||' rows. Batch now contains '||v_limit - v_rowcount||' records');
PERFORM gdb(p_debug, 'Removed '||v_rowcount||' rows from batch. Batch table now contains '||v_limit - v_rowcount||' records');
v_batch_limit_reached = 2;
v_total := v_total - v_rowcount;
IF (v_limit - v_rowcount) < 1 THEN
v_step_id := add_step(v_job_id, 'Reached inconsistent state');
PERFORM update_step(v_step_id, 'CRITICAL', 'Batch contained max rows ('||v_limit||') or greater and all contained the same timestamp value. Unable to guarentee rows will ever be replicated consistently. Increase row limit parameter to allow a consistent batch.');
PERFORM gdb(p_debug, 'Batch contained max rows desired ('||v_limit||') or greaer and all contained the same timestamp value. Unable to guarentee rows will be replicated consistently. Increase row limit parameter to allow a consistent batch.');
v_batch_limit_reached = 3;
END IF;
ELSE
PERFORM update_step(v_step_id, 'OK','No issues found');
PERFORM gdb(p_debug, 'No issues found');
END IF;
IF v_batch_limit_reached <> 3 THEN
v_step_id := add_step(v_job_id,'Inserting new records into local table');
EXECUTE 'INSERT INTO '||v_dest_table||' ('||v_cols||') SELECT '||v_cols||' FROM '||v_tmp_table;
PERFORM update_step(v_step_id, 'OK','Inserted '||v_total||' records');
PERFORM gdb(p_debug, 'Inserted '||v_total||' records');
END IF;
END IF; -- end v_limit IF
IF v_batch_limit_reached <> 3 THEN
v_step_id := add_step(v_job_id, 'Setting next lower boundary');
EXECUTE 'SELECT max('||v_control||') FROM '|| v_dest_table INTO v_last_value;
UPDATE refresh_config_inserter set last_value = coalesce(v_last_value, CURRENT_TIMESTAMP), last_run = CURRENT_TIMESTAMP WHERE dest_table = p_destination;
PERFORM update_step(v_step_id, 'OK','Lower boundary value is: '|| coalesce(v_last_value, CURRENT_TIMESTAMP));
PERFORM gdb(p_debug, 'Lower boundary value is: '||coalesce(v_last_value, CURRENT_TIMESTAMP));
END IF;
EXECUTE 'DROP TABLE IF EXISTS ' || v_tmp_table;
PERFORM dblink_disconnect(v_dblink_name);
IF v_batch_limit_reached = 0 THEN
PERFORM close_job(v_job_id);
ELSIF v_batch_limit_reached = 2 THEN
-- Set final job status to level 2 (WARNING) to bring notice that the batch limit was reached and may need adjusting.
-- Preventive warning to keep replication from falling behind.
PERFORM fail_job(v_job_id, 2);
ELSIF v_batch_limit_reached = 3 THEN
-- Really bad. Critical alert!
PERFORM fail_job(v_job_id);
END IF;
-- Ensure old search path is reset for the current session
EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
PERFORM pg_advisory_unlock(hashtext('refresh_inserter'), hashtext(v_job_name));
EXCEPTION
WHEN QUERY_CANCELED THEN
EXECUTE 'SELECT '||v_dblink_schema||'.dblink_get_connections() @> ARRAY['||quote_literal(v_dblink_name)||']' INTO v_link_exists;
IF v_link_exists THEN
EXECUTE 'SELECT '||v_dblink_schema||'.dblink_disconnect('||quote_literal(v_dblink_name)||')';
END IF;
PERFORM pg_advisory_unlock(hashtext('refresh_inserter'), hashtext(v_job_name));
RAISE EXCEPTION '%', SQLERRM;
WHEN OTHERS THEN
IF v_job_id IS NULL THEN
EXECUTE 'SELECT '||v_jobmon_schema||'.add_job(''Refresh Inserter: '||p_destination||''')' INTO v_job_id;
EXECUTE 'SELECT '||v_jobmon_schema||'.add_step('||v_job_id||', ''EXCEPTION before job logging started'')' INTO v_step_id;
END IF;
IF v_step_id IS NULL THEN
EXECUTE 'SELECT '||v_jobmon_schema||'.add_step('||v_job_id||', ''EXCEPTION before first step logged'')' INTO v_step_id;
END IF;
EXECUTE 'SELECT '||v_dblink_schema||'.dblink_get_connections() @> ARRAY['||quote_literal(v_dblink_name)||']' INTO v_link_exists;
IF v_link_exists THEN
EXECUTE 'SELECT '||v_dblink_schema||'.dblink_disconnect('||quote_literal(v_dblink_name)||')';
END IF;
EXECUTE 'SELECT '||v_jobmon_schema||'.update_step('||v_step_id||', ''CRITICAL'', ''ERROR: '||COALESCE(SQLERRM,'unknown')||''')';
EXECUTE 'SELECT '||v_jobmon_schema||'.fail_job('||v_job_id||')';
PERFORM pg_advisory_unlock(hashtext('refresh_inserter'), hashtext(v_job_name));
RAISE EXCEPTION '%', SQLERRM;
END
$$;
/*
* Refresh based on DML (Insert, Update, Delete), but logs all deletes on the destination table
* Destination table requires extra column: mimeo_source_deleted timestamptz
*/
CREATE OR REPLACE FUNCTION refresh_logdel(p_destination text, p_limit int DEFAULT NULL, p_repull boolean DEFAULT false, p_debug boolean DEFAULT false) RETURNS void
LANGUAGE plpgsql SECURITY DEFINER
AS $$
DECLARE
v_adv_lock boolean;
v_batch_limit_reached boolean := false;
v_cols_n_types text;
v_cols text;
v_condition text;
v_control text;
v_dblink int;
v_dblink_name text;
v_dblink_schema text;
v_delete_d_sql text;
v_delete_f_sql text;
v_dest_table text;
v_exec_status text;
v_fetch_sql text;
v_field text;
v_filter text[];
v_insert_deleted_sql text;
v_insert_sql text;
v_job_id int;
v_jobmon_schema text;
v_job_name text;
v_limit int;
v_link_exists boolean;
v_old_search_path text;
v_pk_counter int;
v_pk_name text[];
v_pk_name_csv text;
v_pk_name_type_csv text := '';
v_pk_type text[];
v_pk_where text := '';
v_remote_d_sql text;
v_remote_f_sql text;
v_remote_q_sql text;
v_rowcount bigint := 0;
v_source_table text;
v_step_id int;
v_tmp_table text;
v_total bigint := 0;
v_trigger_delete text;
v_trigger_update text;
v_truncate_remote_q text;
v_with_update text;
BEGIN
IF p_debug IS DISTINCT FROM true THEN
PERFORM set_config( 'client_min_messages', 'warning', true );
END IF;
v_job_name := 'Refresh Log Del: '||p_destination;
v_dblink_name := 'mimeo_logdel_refresh_'||p_destination;
SELECT nspname INTO v_dblink_schema FROM pg_namespace n, pg_extension e WHERE e.extname = 'dblink' AND e.extnamespace = n.oid;
SELECT nspname INTO v_jobmon_schema FROM pg_namespace n, pg_extension e WHERE e.extname = 'pg_jobmon' AND e.extnamespace = n.oid;
-- Set custom search path to allow easier calls to other functions, especially job logging
SELECT current_setting('search_path') INTO v_old_search_path;
EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||','||v_dblink_schema||',public'',''false'')';
-- Take advisory lock to prevent multiple calls to function overlapping
v_adv_lock := pg_try_advisory_lock(hashtext('refresh_logdel'), hashtext(v_job_name));
IF v_adv_lock = 'false' THEN
v_job_id := add_job(v_job_name);
v_step_id := add_step(v_job_id,'Obtaining advisory lock for job: '||v_job_name);
PERFORM gdb(p_debug,'Obtaining advisory lock FAILED for job: '||v_job_name);
PERFORM update_step(v_step_id, 'WARNING','Found concurrent job. Exiting gracefully');
PERFORM fail_job(v_job_id, 2);
EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
RETURN;
END IF;
SELECT source_table
, dest_table
, 'tmp_'||replace(dest_table,'.','_')
, dblink
, control
, pk_name
, pk_type
, filter
, condition
, batch_limit
FROM refresh_config_logdel
WHERE dest_table = p_destination INTO
v_source_table
, v_dest_table
, v_tmp_table
, v_dblink
, v_control
, v_pk_name
, v_pk_type
, v_filter
, v_condition
, v_limit;
IF NOT FOUND THEN
RAISE EXCEPTION 'No configuration found for %',v_job_name;
END IF;
v_job_id := add_job(v_job_name);
PERFORM gdb(p_debug,'Job ID: '||v_job_id::text);
v_step_id := add_step(v_job_id,'Sanity check primary/unique key values');
IF v_pk_name IS NULL OR v_pk_type IS NULL THEN
RAISE EXCEPTION 'Primary key fields in refresh_config_logdel must be defined';
END IF;
-- determine column list, column type list
IF v_filter IS NULL THEN
SELECT array_to_string(array_agg(attname),','), array_to_string(array_agg(attname||' '||format_type(atttypid, atttypmod)::text),',')
INTO v_cols, v_cols_n_types
FROM pg_attribute WHERE attnum > 0 AND attisdropped is false AND attrelid = p_destination::regclass AND attname != 'mimeo_source_deleted';
ELSE
-- ensure all primary key columns are included in any column filters
FOREACH v_field IN ARRAY v_pk_name LOOP
IF v_field = ANY(v_filter) THEN
CONTINUE;
ELSE
RAISE EXCEPTION 'Filter list did not contain all columns that compose primary key for %',v_job_name;
END IF;
END LOOP;
SELECT array_to_string(array_agg(attname),','), array_to_string(array_agg(attname||' '||format_type(atttypid, atttypmod)::text),',')
INTO v_cols, v_cols_n_types
FROM pg_attribute WHERE attrelid = p_destination::regclass AND ARRAY[attname::text] <@ v_filter AND attnum > 0 AND attisdropped is false AND attname != 'mimeo_source_deleted' ;
END IF;
IF p_limit IS NOT NULL THEN
v_limit := p_limit;
END IF;
v_pk_name_csv := array_to_string(v_pk_name,',');
v_pk_counter := 1;
WHILE v_pk_counter <= array_length(v_pk_name,1) LOOP
IF v_pk_counter > 1 THEN
v_pk_name_type_csv := v_pk_name_type_csv || ', ';
v_pk_where := v_pk_where ||' AND ';
END IF;
v_pk_name_type_csv := v_pk_name_type_csv ||v_pk_name[v_pk_counter]||' '||v_pk_type[v_pk_counter];
v_pk_where := v_pk_where || ' a.'||v_pk_name[v_pk_counter]||' = b.'||v_pk_name[v_pk_counter];
v_pk_counter := v_pk_counter + 1;
END LOOP;
PERFORM update_step(v_step_id, 'OK','Done');
PERFORM dblink_connect(v_dblink_name, auth(v_dblink));
-- update remote entries
v_step_id := add_step(v_job_id,'Updating remote trigger table');
v_with_update := 'WITH a AS (SELECT '||v_pk_name_csv||' FROM '|| v_control ||' ORDER BY '||v_pk_name_csv||' LIMIT '|| COALESCE(v_limit::text, 'ALL') ||') UPDATE '||v_control||' b SET processed = true FROM a WHERE '|| v_pk_where;
v_trigger_update := 'SELECT dblink_exec('||quote_literal(v_dblink_name)||','|| quote_literal(v_with_update)||')';
PERFORM gdb(p_debug,v_trigger_update);
EXECUTE v_trigger_update INTO v_exec_status;
PERFORM update_step(v_step_id, 'OK','Result was '||v_exec_status);
-- create temp table for recording deleted rows
EXECUTE 'CREATE TEMP TABLE '||v_tmp_table||'_deleted ('||v_cols_n_types||', mimeo_source_deleted timestamptz)';
v_remote_d_sql := 'SELECT '||v_cols||', mimeo_source_deleted FROM '||v_control||' WHERE processed = true and mimeo_source_deleted IS NOT NULL';
PERFORM dblink_open(v_dblink_name, 'mimeo_cursor', v_remote_d_sql);
v_step_id := add_step(v_job_id, 'Creating local queue temp table for deleted rows on source');
v_rowcount := 0;
v_total := 0;
LOOP
v_fetch_sql := 'INSERT INTO '||v_tmp_table||'_deleted ('||v_cols||', mimeo_source_deleted)
SELECT '||v_cols||', mimeo_source_deleted FROM dblink_fetch('||quote_literal(v_dblink_name)||', ''mimeo_cursor'', 50000) AS ('||v_cols_n_types||', mimeo_source_deleted timestamptz)';
EXECUTE v_fetch_sql;
GET DIAGNOSTICS v_rowcount = ROW_COUNT;
EXIT WHEN v_rowcount = 0;
v_total := v_total + coalesce(v_rowcount, 0);
PERFORM gdb(p_debug,'Fetching rows in batches: '||v_total||' done so far.');
PERFORM update_step(v_step_id, 'PENDING', 'Fetching rows in batches: '||v_total||' done so far.');
END LOOP;
PERFORM dblink_close(v_dblink_name, 'mimeo_cursor');
EXECUTE 'CREATE INDEX ON '||v_tmp_table||'_deleted ('||v_pk_name_csv||')';
EXECUTE 'ANALYZE '||v_tmp_table||'_deleted';
PERFORM update_step(v_step_id, 'OK','Number of rows inserted: '||v_total);
PERFORM gdb(p_debug,'Temp deleted queue table row count '||v_total::text);
IF p_repull THEN
-- Do delete instead of truncate like refresh_dml to avoid missing rows between the above deleted queue fetch and here.
PERFORM update_step(v_step_id, 'OK','Request to repull ALL data from source. This could take a while...');
PERFORM gdb(p_debug, 'Request to repull ALL data from source. This could take a while...');
v_truncate_remote_q := 'SELECT dblink_exec('||quote_literal(v_dblink_name)||','||quote_literal('DELETE FROM '||v_control||' WHERE processed = true')||')';
PERFORM gdb(p_debug, v_truncate_remote_q);
EXECUTE v_truncate_remote_q;
v_step_id := add_step(v_job_id,'Removing local, undeleted rows');
PERFORM gdb(p_debug,'Removing local, undeleted rows');
EXECUTE 'DELETE FROM '||v_dest_table||' WHERE mimeo_source_deleted IS NULL';
PERFORM update_step(v_step_id, 'OK','Done');
-- Define cursor query
v_remote_f_sql := 'SELECT '||v_cols||' FROM '||v_source_table;
IF v_condition IS NOT NULL THEN
v_remote_f_sql := v_remote_f_sql || ' ' || v_condition;
END IF;
ELSE
-- Do normal stuff here
EXECUTE 'CREATE TEMP TABLE '||v_tmp_table||'_queue ('||v_pk_name_type_csv||')';
v_remote_q_sql := 'SELECT DISTINCT '||v_pk_name_csv||' FROM '||v_control||' WHERE processed = true and mimeo_source_deleted IS NULL';
PERFORM dblink_open(v_dblink_name, 'mimeo_cursor', v_remote_q_sql);
v_step_id := add_step(v_job_id, 'Creating local queue temp table for inserts/updates');
v_rowcount := 0;
LOOP
v_fetch_sql := 'INSERT INTO '||v_tmp_table||'_queue ('||v_pk_name_csv||')
SELECT '||v_pk_name_csv||' FROM dblink_fetch('||quote_literal(v_dblink_name)||', ''mimeo_cursor'', 50000) AS ('||v_pk_name_type_csv||')';
EXECUTE v_fetch_sql;
GET DIAGNOSTICS v_rowcount = ROW_COUNT;
EXIT WHEN v_rowcount = 0;
v_total := v_total + coalesce(v_rowcount, 0);
PERFORM gdb(p_debug,'Fetching rows in batches: '||v_total||' done so far.');
PERFORM update_step(v_step_id, 'PENDING', 'Fetching rows in batches: '||v_total||' done so far.');
END LOOP;
PERFORM dblink_close(v_dblink_name, 'mimeo_cursor');
EXECUTE 'CREATE INDEX ON '||v_tmp_table||'_queue ('||v_pk_name_csv||')';
EXECUTE 'ANALYZE '||v_tmp_table||'_queue';
PERFORM update_step(v_step_id, 'OK','Number of rows inserted: '||v_total);
PERFORM gdb(p_debug,'Temp inserts/updates queue table row count '||v_total::text);
-- remove records from local table (inserts/updates)
v_step_id := add_step(v_job_id,'Removing insert/update records from local table');
v_delete_f_sql := 'DELETE FROM '||v_dest_table||' a USING '||v_tmp_table||'_queue b WHERE '|| v_pk_where;
PERFORM gdb(p_debug,v_delete_f_sql);
EXECUTE v_delete_f_sql;
GET DIAGNOSTICS v_rowcount = ROW_COUNT;
PERFORM gdb(p_debug,'Insert/Update rows removed from local table before applying changes: '||v_rowcount::text);
PERFORM update_step(v_step_id, 'OK','Removed '||v_rowcount||' records');
-- remove records from local table (deleted rows)
v_step_id := add_step(v_job_id,'Removing deleted records from local table');
v_delete_d_sql := 'DELETE FROM '||v_dest_table||' a USING '||v_tmp_table||'_deleted b WHERE '|| v_pk_where;
PERFORM gdb(p_debug,v_delete_d_sql);
EXECUTE v_delete_d_sql;
GET DIAGNOSTICS v_rowcount = ROW_COUNT;
PERFORM gdb(p_debug,'Deleted rows removed from local table before applying changes: '||v_rowcount::text);
PERFORM update_step(v_step_id, 'OK','Removed '||v_rowcount||' records');
-- Remote full query for normal replication
v_remote_f_sql := 'SELECT '||v_cols||' FROM '||v_source_table||' JOIN ('||v_remote_q_sql||') x USING ('||v_pk_name_csv||')';
IF v_condition IS NOT NULL THEN
v_remote_f_sql := v_remote_f_sql || ' ' || v_condition;
END IF;
END IF;
-- insert records to local table (inserts/updates). Have to do temp table in case destination table is partitioned (returns 0 when inserting to parent)
PERFORM dblink_open(v_dblink_name, 'mimeo_cursor', v_remote_f_sql);
v_step_id := add_step(v_job_id, 'Inserting new/updated records into local table');
EXECUTE 'CREATE TEMP TABLE '||v_tmp_table||'_full ('||v_cols_n_types||')';
v_rowcount := 0;
v_total := 0;
LOOP
v_fetch_sql := 'INSERT INTO '||v_tmp_table||'_full ('||v_cols||')
SELECT '||v_cols||' FROM dblink_fetch('||quote_literal(v_dblink_name)||', ''mimeo_cursor'', 50000) AS ('||v_cols_n_types||')';
EXECUTE v_fetch_sql;
GET DIAGNOSTICS v_rowcount = ROW_COUNT;
v_total := v_total + coalesce(v_rowcount, 0);
EXECUTE 'INSERT INTO '||v_dest_table||' ('||v_cols||') SELECT '||v_cols||' FROM '||v_tmp_table||'_full';
EXECUTE 'TRUNCATE '||v_tmp_table||'_full';
EXIT WHEN v_rowcount = 0;
PERFORM gdb(p_debug,'Fetching rows in batches: '||v_total||' done so far.');
PERFORM update_step(v_step_id, 'PENDING', 'Fetching rows in batches: '||v_total||' done so far.');
END LOOP;
PERFORM dblink_close(v_dblink_name, 'mimeo_cursor');
PERFORM update_step(v_step_id, 'OK','New/updated rows inserted: '||v_total);
-- insert records to local table (deleted rows to be kept)
v_step_id := add_step(v_job_id,'Inserting deleted records into local table');
v_insert_deleted_sql := 'INSERT INTO '||v_dest_table||'('||v_cols||', mimeo_source_deleted) SELECT '||v_cols||', mimeo_source_deleted FROM '||v_tmp_table||'_deleted';
PERFORM gdb(p_debug,v_insert_deleted_sql);
EXECUTE v_insert_deleted_sql;
GET DIAGNOSTICS v_rowcount = ROW_COUNT;
PERFORM gdb(p_debug,'Deleted rows inserted: '||v_rowcount::text);
PERFORM update_step(v_step_id, 'OK','Inserted '||v_rowcount||' records');
IF (v_total + v_rowcount) > (v_limit * .75) THEN
v_step_id := add_step(v_job_id, 'Row count warning');
PERFORM update_step(v_step_id, 'WARNING','Row count fetched ('||v_total||') greater than 75% of batch limit ('||v_limit||'). Recommend increasing batch limit if possible.');
v_batch_limit_reached := true;
END IF;
-- clean out rows from txn table
v_step_id := add_step(v_job_id,'Cleaning out rows from txn table');
v_trigger_delete := 'SELECT dblink_exec('||quote_literal(v_dblink_name)||','||quote_literal('DELETE FROM '||v_control||' WHERE processed = true')||')';
PERFORM gdb(p_debug,v_trigger_delete);
EXECUTE v_trigger_delete INTO v_exec_status;
PERFORM update_step(v_step_id, 'OK','Result was '||v_exec_status);
-- update activity status
v_step_id := add_step(v_job_id,'Updating last_run in config table');
UPDATE refresh_config_logdel SET last_run = CURRENT_TIMESTAMP WHERE dest_table = p_destination;
PERFORM update_step(v_step_id, 'OK','Last Value was '||current_timestamp);
PERFORM dblink_disconnect(v_dblink_name);
EXECUTE 'DROP TABLE IF EXISTS '||v_tmp_table||'_full';
EXECUTE 'DROP TABLE IF EXISTS '||v_tmp_table||'_queue';
EXECUTE 'DROP TABLE IF EXISTS '||v_tmp_table||'_deleted';
IF v_batch_limit_reached = false THEN
PERFORM close_job(v_job_id);
ELSE
-- Set final job status to level 2 (WARNING) to bring notice that the batch limit was reached and may need adjusting.
-- Preventive warning to keep replication from falling behind.
PERFORM fail_job(v_job_id, 2);
END IF;
-- Ensure old search path is reset for the current session
EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
PERFORM pg_advisory_unlock(hashtext('refresh_logdel'), hashtext(v_job_name));
EXCEPTION
WHEN QUERY_CANCELED THEN
EXECUTE 'SELECT '||v_dblink_schema||'.dblink_get_connections() @> ARRAY['||quote_literal(v_dblink_name)||']' INTO v_link_exists;
IF v_link_exists THEN
EXECUTE 'SELECT '||v_dblink_schema||'.dblink_disconnect('||quote_literal(v_dblink_name)||')';
END IF;
PERFORM pg_advisory_unlock(hashtext('refresh_logdel'), hashtext(v_job_name));
RAISE EXCEPTION '%', SQLERRM;
WHEN OTHERS THEN
IF v_job_id IS NULL THEN
EXECUTE 'SELECT '||v_jobmon_schema||'.add_job(''Refresh Log Del: '||p_destination||''')' INTO v_job_id;
EXECUTE 'SELECT '||v_jobmon_schema||'.add_step('||v_job_id||', ''EXCEPTION before job logging started'')' INTO v_step_id;
END IF;
IF v_step_id IS NULL THEN
EXECUTE 'SELECT '||v_jobmon_schema||'.add_step('||v_job_id||', ''EXCEPTION before first step logged'')' INTO v_step_id;
END IF;
EXECUTE 'SELECT '||v_dblink_schema||'.dblink_get_connections() @> ARRAY['||quote_literal(v_dblink_name)||']' INTO v_link_exists;
IF v_link_exists THEN
EXECUTE 'SELECT '||v_dblink_schema||'.dblink_disconnect('||quote_literal(v_dblink_name)||')';
END IF;
EXECUTE 'SELECT '||v_jobmon_schema||'.update_step('||v_step_id||', ''CRITICAL'', ''ERROR: '||coalesce(SQLERRM,'unknown')||''')';
EXECUTE 'SELECT '||v_jobmon_schema||'.fail_job('||v_job_id||')';
PERFORM pg_advisory_unlock(hashtext('refresh_logdel'), hashtext(v_job_name));
RAISE EXCEPTION '%', SQLERRM;
END
$$;
/*
* Snap refresh to repull all table data
*/
CREATE OR REPLACE FUNCTION refresh_snap(p_destination text, p_index boolean DEFAULT true, p_debug boolean DEFAULT false, p_pulldata boolean DEFAULT true) RETURNS void
LANGUAGE plpgsql SECURITY DEFINER
AS $$
DECLARE
v_adv_lock boolean;
v_cols_n_types text[];
v_cols text[];
v_condition text;
v_create_sql text;
v_dblink int;
v_dblink_name text;
v_dblink_schema text;
v_dest_table text;
v_exists int;
v_fetch_sql text;
v_filter text[];
v_insert_sql text;
v_job_id int;
v_jobmon_schema text;
v_job_name text;
v_lcols_array text[];
v_link_exists boolean;
v_local_sql text;
v_l text;
v_match boolean = true;
v_old_grant record;
v_old_owner text;
v_old_search_path text;
v_old_snap text;
v_old_snap_table text;
v_parts record;
v_post_script text[];
v_refresh_snap text;
v_remote_index_sql text;
v_remote_sql text;
v_row record;
v_rowcount bigint;
v_r text;
v_snap text;
v_source_table text;
v_step_id int;
v_table_exists boolean;
v_total bigint := 0;
v_tup_del bigint;
v_tup_ins bigint;
v_tup_upd bigint;
v_tup_del_new bigint;
v_tup_ins_new bigint;
v_tup_upd_new bigint;
v_view_definition text;
BEGIN
IF p_debug IS DISTINCT FROM true THEN
PERFORM set_config( 'client_min_messages', 'notice', true );
END IF;
v_job_name := 'Refresh Snap: '||p_destination;
v_dblink_name := 'mimeo_snap_refresh_'||p_destination;
SELECT nspname INTO v_dblink_schema FROM pg_namespace n, pg_extension e WHERE e.extname = 'dblink' AND e.extnamespace = n.oid;
SELECT nspname INTO v_jobmon_schema FROM pg_namespace n, pg_extension e WHERE e.extname = 'pg_jobmon' AND e.extnamespace = n.oid;
-- Set custom search path to allow easier calls to other functions, especially job logging
SELECT current_setting('search_path') INTO v_old_search_path;
EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||','||v_dblink_schema||',public'',''false'')';
-- Take advisory lock to prevent multiple calls to function overlapping and causing possible deadlock
v_adv_lock := pg_try_advisory_lock(hashtext('refresh_snap'), hashtext(v_job_name));
IF v_adv_lock = 'false' THEN
v_job_id := add_job(v_job_name);
v_step_id := add_step(v_job_id,'Obtaining advisory lock for job: '||v_job_name);
PERFORM gdb(p_debug,'Obtaining advisory lock FAILED for job: '||v_job_name);
PERFORM update_step(v_step_id, 'WARNING','Found concurrent job. Exiting gracefully');
PERFORM fail_job(v_job_id, 2);
EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
RETURN;
END IF;
v_job_id := add_job(v_job_name);
PERFORM gdb(p_debug,'Job ID: '||v_job_id::text);
v_step_id := add_step(v_job_id,'Grabbing Mapping, Building SQL');
SELECT source_table
, dest_table
, dblink
, filter
, condition
, n_tup_ins
, n_tup_upd
, n_tup_del
, post_script
INTO v_source_table
, v_dest_table
, v_dblink
, v_filter
, v_condition
, v_tup_ins
, v_tup_upd
, v_tup_del
, v_post_script
FROM refresh_config_snap
WHERE dest_table = p_destination;
IF NOT FOUND THEN
RAISE EXCEPTION 'No configuration found for %',v_job_name;
END IF;
-- checking for current view
SELECT definition INTO v_view_definition FROM pg_views where
((schemaname || '.') || viewname)=v_dest_table;
PERFORM dblink_connect(v_dblink_name, @extschema@.auth(v_dblink));
PERFORM update_step(v_step_id, 'OK','Done');
v_step_id := add_step(v_job_id,'Truncate non-active snap table');
v_exists := strpos(v_view_definition, 'snap1');
IF v_exists > 0 THEN
v_snap := 'snap2';
v_old_snap := 'snap1';
ELSE
v_snap := 'snap1';
v_old_snap := 'snap2';
END IF;
v_refresh_snap := v_dest_table||'_'||v_snap;
v_old_snap_table := v_dest_table||'_'||v_old_snap;
PERFORM gdb(p_debug,'v_refresh_snap: '||v_refresh_snap::text);
-- Create snap table if it doesn't exist
PERFORM gdb(p_debug, 'Getting table columns and creating destination table if it doesn''t exist');
SELECT p_table_exists, p_cols, p_cols_n_types FROM manage_dest_table(v_dest_table, v_snap, p_debug) INTO v_table_exists, v_cols, v_cols_n_types;
IF v_table_exists THEN
/* Check local column definitions against remote and recreate table if different. Allows automatic recreation of
snap tables if columns change (add, drop type change) */
v_local_sql := 'SELECT array_agg(attname||'' ''||format_type(atttypid, atttypmod)::text) as cols_n_types FROM pg_attribute WHERE attnum > 0 AND attisdropped is false AND attrelid = ' || quote_literal(v_refresh_snap) || '::regclass';
PERFORM gdb(p_debug, v_local_sql);
EXECUTE v_local_sql INTO v_lcols_array;
-- Check to see if there's a change in the column structure on the remote
FOREACH v_r IN ARRAY v_cols_n_types LOOP
v_match := false;
FOREACH v_l IN ARRAY v_lcols_array LOOP
IF v_r = v_l THEN
v_match := true;
EXIT;
END IF;
END LOOP;
END LOOP;
IF v_match = false THEN
-- Grab old table & view privileges. They are applied later after the view is recreated/swapped
CREATE TEMP TABLE mimeo_snapshot_grants_tmp (statement text);
FOR v_old_grant IN
SELECT table_schema ||'.'|| table_name AS tablename
, array_agg(privilege_type::text) AS types
, grantee
FROM information_schema.table_privileges
WHERE table_schema ||'.'|| table_name IN (v_refresh_snap, v_dest_table)
GROUP BY grantee, table_schema, table_name
LOOP
INSERT INTO mimeo_snapshot_grants_tmp VALUES (
'GRANT '||array_to_string(v_old_grant.types, ',')||' ON '||v_old_grant.tablename||' TO '||v_old_grant.grantee
);
END LOOP;
SELECT viewowner INTO v_old_owner FROM pg_views WHERE schemaname ||'.'|| viewname = v_dest_table;
EXECUTE 'DROP TABLE ' || v_refresh_snap;
EXECUTE 'DROP VIEW ' || v_dest_table;
PERFORM manage_dest_table(v_dest_table, v_snap, p_debug);
v_step_id := add_step(v_job_id,'Source table structure changed.');
PERFORM update_step(v_step_id, 'OK','Tables and view dropped and recreated. Please double-check snap table attributes (permissions, indexes, etc');
PERFORM gdb(p_debug,'Source table structure changed. Tables and view dropped and recreated. Please double-check snap table attributes (permissions, indexes, etc)');
END IF;
-- truncate non-active snap table
EXECUTE 'TRUNCATE TABLE ' || v_refresh_snap;
PERFORM update_step(v_step_id, 'OK','Done');
END IF;
-- Only check the remote data if there have been no column changes and snap table actually exists.
-- Otherwise maker functions won't work if source is empty & view switch won't happen properly.
IF v_table_exists AND v_match THEN
v_remote_sql := 'SELECT n_tup_ins, n_tup_upd, n_tup_del FROM pg_catalog.pg_stat_all_tables WHERE relid::regclass = '||quote_literal(v_source_table)||'::regclass';
v_remote_sql := 'SELECT n_tup_ins, n_tup_upd, n_tup_del FROM dblink('||quote_literal(v_dblink_name)||', ' || quote_literal(v_remote_sql) || ') t (n_tup_ins bigint, n_tup_upd bigint, n_tup_del bigint)';
perform gdb(p_debug,'v_remote_sql: '||v_remote_sql);
EXECUTE v_remote_sql INTO v_tup_ins_new, v_tup_upd_new, v_tup_del_new;
IF v_tup_ins_new = v_tup_ins AND v_tup_upd_new = v_tup_upd AND v_tup_del_new = v_tup_del THEN
PERFORM gdb(p_debug,'Remote table has not had any writes. Skipping data pull');
PERFORM update_step(v_step_id, 'OK', 'Remote table has not had any writes. Skipping data pull');
UPDATE refresh_config_snap SET last_run = CURRENT_TIMESTAMP WHERE dest_table = p_destination;
PERFORM dblink_disconnect(v_dblink_name);
PERFORM close_job(v_job_id);
EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
PERFORM pg_advisory_unlock(hashtext('refresh_snap'), hashtext(v_job_name));
RETURN;
END IF;
END IF;
v_remote_sql := 'SELECT '|| array_to_string(v_cols, ',') ||' FROM '||v_source_table;
-- Used by p_pulldata parameter in maker function
IF p_pulldata = false THEN
v_remote_sql := v_remote_sql || ' LIMIT 0';
ELSIF v_condition IS NOT NULL THEN
v_remote_sql := v_remote_sql || ' ' || v_condition;
END IF;
v_step_id := add_step(v_job_id,'Inserting records into local table');
PERFORM dblink_open(v_dblink_name, 'mimeo_cursor', v_remote_sql);
v_rowcount := 0;
LOOP
v_fetch_sql := 'INSERT INTO '|| v_refresh_snap ||' ('|| array_to_string(v_cols, ',') ||')
SELECT '||array_to_string(v_cols, ',')||' FROM dblink_fetch('||quote_literal(v_dblink_name)||', ''mimeo_cursor'', 50000) AS ('||array_to_string(v_cols_n_types, ',')||')';
EXECUTE v_fetch_sql;
GET DIAGNOSTICS v_rowcount = ROW_COUNT;
EXIT WHEN v_rowcount = 0;
v_total := v_total + coalesce(v_rowcount, 0);
PERFORM gdb(p_debug,'Fetching rows in batches: '||v_total||' done so far.');
PERFORM update_step(v_step_id, 'PENDING', 'Fetching rows in batches: '||v_total||' done so far.');
END LOOP;
PERFORM dblink_close(v_dblink_name, 'mimeo_cursor');
PERFORM update_step(v_step_id, 'OK','Inserted '||v_total||' rows');
-- Create indexes if new table was created
IF (v_table_exists = false OR v_match = 'f') AND p_index = true THEN
PERFORM gdb(p_debug, 'Creating indexes');
PERFORM create_index(v_dest_table, v_snap, p_debug);
END IF;
EXECUTE 'ANALYZE ' ||v_refresh_snap;
-- swap view
v_step_id := add_step(v_job_id,'Swap view to '||v_refresh_snap);
PERFORM gdb(p_debug,'Swapping view to '||v_refresh_snap);
EXECUTE 'CREATE OR REPLACE VIEW '||v_dest_table||' AS SELECT * FROM '||v_refresh_snap;
PERFORM update_step(v_step_id, 'OK','View Swapped');
IF v_match = false THEN
-- Actually apply the original privileges if the table was recreated
FOR v_old_grant IN SELECT statement FROM mimeo_snapshot_grants_tmp
LOOP
EXECUTE v_old_grant.statement;
END LOOP;
DROP TABLE IF EXISTS mimeo_snapshot_grants_tmp;
EXECUTE 'ALTER VIEW '||v_dest_table||' OWNER TO '||v_old_owner;
EXECUTE 'ALTER TABLE '||v_refresh_snap||' OWNER TO '||v_old_owner;
-- Run any special sql to fix anything that was done to destination tables (extra indexes, etc)
IF v_post_script IS NOT NULL THEN
v_step_id := add_step(v_job_id,'Applying post_script sql commands due to schema change');
PERFORM @extschema@.post_script(v_dest_table);
PERFORM update_step(v_step_id, 'OK','Done');
END IF;
END IF;
SELECT
CASE
WHEN count(1) > 0 THEN true
ELSE false
END
INTO v_table_exists FROM pg_tables WHERE schemaname ||'.'|| tablename = v_old_snap_table;
IF v_table_exists THEN
v_step_id := add_step(v_job_id,'Truncating old snap table');
EXECUTE 'TRUNCATE TABLE '||v_old_snap_table;
PERFORM update_step(v_step_id, 'OK','Done');
END IF;
v_step_id := add_step(v_job_id,'Updating last_run & tuple change values');
UPDATE refresh_config_snap SET
last_run = CURRENT_TIMESTAMP
, n_tup_ins = v_tup_ins_new
, n_tup_upd = v_tup_upd_new
, n_tup_del = v_tup_del_new
WHERE dest_table = p_destination;
PERFORM update_step(v_step_id, 'OK','Done');
PERFORM dblink_disconnect(v_dblink_name);
PERFORM close_job(v_job_id);
-- Ensure old search path is reset for the current session
EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
PERFORM pg_advisory_unlock(hashtext('refresh_snap'), hashtext(v_job_name));
EXCEPTION
WHEN QUERY_CANCELED THEN
EXECUTE 'SELECT '||v_dblink_schema||'.dblink_get_connections() @> ARRAY['||quote_literal(v_dblink_name)||']' INTO v_link_exists;
IF v_link_exists THEN
EXECUTE 'SELECT '||v_dblink_schema||'.dblink_disconnect('||quote_literal(v_dblink_name)||')';
END IF;
PERFORM pg_advisory_unlock(hashtext('refresh_snap'), hashtext(v_job_name));
RAISE EXCEPTION '%', SQLERRM;
WHEN OTHERS THEN
IF v_job_id IS NULL THEN
EXECUTE 'SELECT '||v_jobmon_schema||'.add_job(''Refresh Snap: '||p_destination||''')' INTO v_job_id;
EXECUTE 'SELECT '||v_jobmon_schema||'.add_step('||v_job_id||', ''EXCEPTION before job logging started'')' INTO v_step_id;
END IF;
IF v_step_id IS NULL THEN
EXECUTE 'SELECT '||v_jobmon_schema||'.add_step('||v_job_id||', ''EXCEPTION before first step logged'')' INTO v_step_id;
END IF;
EXECUTE 'SELECT '||v_dblink_schema||'.dblink_get_connections() @> ARRAY['||quote_literal(v_dblink_name)||']' INTO v_link_exists;
IF v_link_exists THEN
EXECUTE 'SELECT '||v_dblink_schema||'.dblink_disconnect('||quote_literal(v_dblink_name)||')';
END IF;
EXECUTE 'SELECT '||v_jobmon_schema||'.update_step('||v_step_id||', ''CRITICAL'', ''ERROR: '||COALESCE(SQLERRM,'unknown')||''')';
EXECUTE 'SELECT '||v_jobmon_schema||'.fail_job('||v_job_id||')';
PERFORM pg_advisory_unlock(hashtext('refresh_snap'), hashtext(v_job_name));
RAISE EXCEPTION '%', SQLERRM;
END
$$;
/*
* Refresh insert/update only table based on timestamp control field
*/
CREATE OR REPLACE FUNCTION refresh_updater(p_destination text, p_limit integer DEFAULT NULL, p_repull boolean DEFAULT false, p_repull_start text DEFAULT NULL, p_repull_end text DEFAULT NULL, p_debug boolean DEFAULT false) RETURNS void
LANGUAGE plpgsql SECURITY DEFINER
AS $$
DECLARE
v_adv_lock boolean;
v_batch_limit_reached int := 0;
v_boundary_sql text;
v_boundary timestamptz;
v_cols_n_types text;
v_cols text;
v_condition text;
v_control text;
v_create_sql text;
v_dblink int;
v_dblink_name text;
v_dblink_schema text;
v_delete_sql text;
v_dest_table text;
v_dst_active boolean;
v_dst_check boolean;
v_dst_start int;
v_dst_end int;
v_fetch_sql text;
v_field text;
v_filter text[];
v_full_refresh boolean := false;
v_insert_sql text;
v_job_id int;
v_jobmon_schema text;
v_job_name text;
v_last_fetched timestamptz;
v_last_value timestamptz;
v_limit int;
v_link_exists boolean;
v_now timestamptz := now();
v_old_search_path text;
v_pk_counter int := 1;
v_pk_name text[];
v_remote_boundry_sql text;
v_remote_boundry timestamptz;
v_remote_sql text;
v_rowcount bigint := 0;
v_source_table text;
v_step_id int;
v_tmp_table text;
v_total bigint := 0;
BEGIN
IF p_debug IS DISTINCT FROM true THEN
PERFORM set_config( 'client_min_messages', 'warning', true );
END IF;
v_job_name := 'Refresh Updater: '||p_destination;
v_dblink_name := 'mimeo_updater_refresh_'||p_destination;
SELECT nspname INTO v_dblink_schema FROM pg_namespace n, pg_extension e WHERE e.extname = 'dblink' AND e.extnamespace = n.oid;
SELECT nspname INTO v_jobmon_schema FROM pg_namespace n, pg_extension e WHERE e.extname = 'pg_jobmon' AND e.extnamespace = n.oid;
-- Set custom search path to allow easier calls to other functions, especially job logging
SELECT current_setting('search_path') INTO v_old_search_path;
EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||','||v_dblink_schema||',public'',''false'')';
-- Take advisory lock to prevent multiple calls to function overlapping
v_adv_lock := pg_try_advisory_lock(hashtext('refresh_updater'), hashtext(v_job_name));
IF v_adv_lock = 'false' THEN
v_job_id := add_job(v_job_name);
v_step_id := add_step(v_job_id,'Obtaining advisory lock for job: '||v_job_name);
PERFORM gdb(p_debug,'Obtaining advisory lock FAILED for job: '||v_job_name);
PERFORM update_step(v_step_id, 'WARNING','Found concurrent job. Exiting gracefully');
PERFORM fail_job(v_job_id, 2);
EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
RETURN;
END IF;
v_job_id := add_job(v_job_name);
PERFORM gdb(p_debug,'Job ID: '||v_job_id::text);
SELECT source_table
, dest_table
, 'tmp_'||replace(dest_table,'.','_')
, dblink
, control
, last_value
, now() - boundary::interval
, pk_name
, filter
, condition
, dst_active
, dst_start
, dst_end
, batch_limit
FROM refresh_config_updater
WHERE dest_table = p_destination INTO
v_source_table
, v_dest_table
, v_tmp_table
, v_dblink
, v_control
, v_last_value
, v_boundary
, v_pk_name
, v_filter
, v_condition
, v_dst_active
, v_dst_start
, v_dst_end
, v_limit;
IF NOT FOUND THEN
RAISE EXCEPTION 'No configuration found for %',v_job_name;
END IF;
-- Do not allow this function to run during DST time change if config option is true. Otherwise will miss data from source
IF v_dst_active THEN
v_dst_check := @extschema@.dst_change(v_now);
IF v_dst_check THEN
IF to_number(to_char(v_now, 'HH24MM'), '0000') > v_dst_start AND to_number(to_char(v_now, 'HH24MM'), '0000') < v_dst_end THEN
v_step_id := add_step( v_job_id, 'DST Check');
PERFORM update_step(v_step_id, 'OK', 'Job CANCELLED - Does not run during DST time change');
UPDATE refresh_config_updater SET last_run = CURRENT_TIMESTAMP WHERE dest_table = p_destination;
PERFORM close_job(v_job_id);
PERFORM gdb(p_debug, 'Cannot run during DST time change');
EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
PERFORM pg_advisory_unlock(hashtext('refresh_updater'), hashtext(v_job_name));
RETURN;
END IF;
END IF;
END IF;
v_step_id := add_step(v_job_id,'Building SQL');
-- determine column list, column type list
IF v_filter IS NULL THEN
SELECT array_to_string(array_agg(attname),','), array_to_string(array_agg(attname||' '||format_type(atttypid, atttypmod)::text),',')
INTO v_cols, v_cols_n_types
FROM pg_attribute WHERE attrelid = p_destination::regclass AND attnum > 0 AND attisdropped is false;
ELSE
-- ensure all primary key columns are included in any column filters
FOREACH v_field IN ARRAY v_pk_name LOOP
IF v_field = ANY(v_filter) THEN
CONTINUE;
ELSE
RAISE EXCEPTION 'Filter list did not contain all columns that compose primary/unique key for %',v_job_name;
END IF;
END LOOP;
SELECT array_to_string(array_agg(attname),','), array_to_string(array_agg(attname||' '||format_type(atttypid, atttypmod)::text),',')
INTO v_cols, v_cols_n_types
FROM pg_attribute WHERE attrelid = p_destination::regclass AND ARRAY[attname::text] <@ v_filter AND attnum > 0 AND attisdropped is false;
END IF;
PERFORM dblink_connect(v_dblink_name, auth(v_dblink));
IF p_limit IS NOT NULL THEN
v_limit := p_limit;
END IF;
-- Repull old data instead of normal new data pull
IF p_repull THEN
-- Repull ALL data if no start and end values set
IF p_repull_start IS NULL AND p_repull_end IS NULL THEN
PERFORM update_step(v_step_id, 'OK','Request to repull ALL data from source. This could take a while...');
EXECUTE 'TRUNCATE '||v_dest_table;
v_remote_sql := 'SELECT '||v_cols||' FROM '||v_source_table;
IF v_condition IS NOT NULL THEN
v_remote_sql := v_remote_sql || ' ' || v_condition;
END IF;
ELSE
PERFORM update_step(v_step_id, 'OK','Request to repull data from '||p_repull_start||' to '||p_repull_end);
PERFORM gdb(p_debug,'Request to repull data from '||p_repull_start||' to '||p_repull_end);
v_remote_sql := 'SELECT '||v_cols||' FROM '||v_source_table;
IF v_condition IS NOT NULL THEN
v_remote_sql := v_remote_sql || ' ' || v_condition || ' AND ';
ELSE
v_remote_sql := v_remote_sql || ' WHERE ';
END IF;
v_remote_sql := v_remote_sql ||v_control||' > '||quote_literal(COALESCE(p_repull_start, '-infinity'))||' AND '
||v_control||' < '||quote_literal(COALESCE(p_repull_end, 'infinity'));
EXECUTE 'DELETE FROM '||v_dest_table||' WHERE '||v_control||' > '||quote_literal(COALESCE(p_repull_start, '-infinity'))||' AND '
||v_control||' < '||quote_literal(COALESCE(p_repull_end, 'infinity'));
END IF;
ELSE
-- does < for upper boundary to keep missing data from happening on rare edge case where a newly inserted row outside the transaction batch
-- has the exact same timestamp as the previous batch's max timestamp
v_remote_sql := 'SELECT '||v_cols||' FROM '||v_source_table;
IF v_condition IS NOT NULL THEN
v_remote_sql := v_remote_sql || ' ' || v_condition || ' AND ';
ELSE
v_remote_sql := v_remote_sql || ' WHERE ';
END IF;
v_remote_sql := v_remote_sql ||v_control||' > '||quote_literal(v_last_value)||' AND '||v_control||' < '||quote_literal(v_boundary)||' ORDER BY '||v_control||' ASC LIMIT '|| COALESCE(v_limit::text, 'ALL');
v_delete_sql := 'DELETE FROM '||v_dest_table||' USING '||v_tmp_table||' t WHERE ';
WHILE v_pk_counter <= array_length(v_pk_name,1) LOOP
IF v_pk_counter > 1 THEN
v_delete_sql := v_delete_sql ||' AND ';
END IF;
v_delete_sql := v_delete_sql ||v_dest_table||'.'||v_pk_name[v_pk_counter]||' = t.'||v_pk_name[v_pk_counter];
v_pk_counter := v_pk_counter + 1;
END LOOP;
PERFORM update_step(v_step_id, 'OK','Grabbing rows from '||v_last_value::text||' to '||v_boundary::text);
PERFORM gdb(p_debug,'Grabbing rows from '||v_last_value::text||' to '||v_boundary::text);
END IF;
v_insert_sql := 'INSERT INTO '||v_dest_table||' ('||v_cols||') SELECT '||v_cols||' FROM '||v_tmp_table;
PERFORM gdb(p_debug,v_remote_sql);
PERFORM dblink_open(v_dblink_name, 'mimeo_cursor', v_remote_sql);
v_step_id := add_step(v_job_id, 'Inserting new/updated records into local table');
v_rowcount := 0;
EXECUTE 'CREATE TEMP TABLE '||v_tmp_table||' ('||v_cols_n_types||')';
LOOP
v_fetch_sql := 'INSERT INTO '||v_tmp_table||'('||v_cols||')
SELECT '||v_cols||' FROM dblink_fetch('||quote_literal(v_dblink_name)||', ''mimeo_cursor'', 50000) AS ('||v_cols_n_types||')';
EXECUTE v_fetch_sql;
GET DIAGNOSTICS v_rowcount = ROW_COUNT;
v_total := v_total + coalesce(v_rowcount, 0);
EXECUTE 'SELECT max('||v_control||') FROM '||v_tmp_table INTO v_last_fetched;
IF v_limit IS NULL THEN -- insert into the real table in batches if no limit to avoid excessively large temp tables
IF p_repull IS FALSE THEN -- Delete any rows that exist in the current temp table batch. repull delete is done above.
EXECUTE v_delete_sql;
END IF;
EXECUTE v_insert_sql;
EXECUTE 'TRUNCATE '||v_tmp_table;
END IF;
EXIT WHEN v_rowcount = 0;
PERFORM gdb(p_debug,'Fetching rows in batches: '||v_total||' done so far. Last fetched: '||v_last_fetched);
PERFORM update_step(v_step_id, 'PENDING', 'Fetching rows in batches: '||v_total||' done so far. Last fetched: '||v_last_fetched);
END LOOP;
PERFORM dblink_close(v_dblink_name, 'mimeo_cursor');
PERFORM update_step(v_step_id, 'OK','Rows fetched: '||v_total);
IF v_limit IS NULL THEN
-- nothing else to do
ELSE
-- When using batch limits, entire batch must be pulled to temp table before inserting to real table to catch edge cases
v_step_id := add_step(v_job_id,'Checking for batch limit issues');
-- Not recommended that the batch actually equal the limit set if possible.
IF v_total >= v_limit THEN
PERFORM update_step(v_step_id, 'WARNING','Row count fetched equal to or greater than limit set: '||v_limit||'. Recommend increasing batch limit if possible.');
PERFORM gdb(p_debug, 'Row count fetched equal to or greater than limit set: '||v_limit||'. Recommend increasing batch limit if possible.');
EXECUTE 'SELECT max('||v_control||') FROM '||v_tmp_table INTO v_last_value;
v_step_id := add_step(v_job_id, 'Removing high boundary rows from this batch to avoid missing data');
EXECUTE 'DELETE FROM '||v_tmp_table||' WHERE '||v_control||' = '||quote_literal(v_last_value);
GET DIAGNOSTICS v_rowcount = ROW_COUNT;
PERFORM update_step(v_step_id, 'OK', 'Removed '||v_rowcount||' rows. Batch now contains '||v_limit - v_rowcount||' records');
PERFORM gdb(p_debug, 'Removed '||v_rowcount||' rows from batch. Batch table now contains '||v_limit - v_rowcount||' records');
v_batch_limit_reached := 2;
IF (v_limit - v_rowcount) < 1 THEN
v_step_id := add_step(v_job_id, 'Reached inconsistent state');
PERFORM update_step(v_step_id, 'CRITICAL', 'Batch contained max rows ('||v_limit||') or greater and all contained the same timestamp value. Unable to guarentee rows will ever be replicated consistently. Increase row limit parameter to allow a consistent batch.');
PERFORM gdb(p_debug, 'Batch contained max rows ('||v_limit||') or greater and all contained the same timestamp value. Unable to guarentee rows will be replicated consistently. Increase row limit parameter to allow a consistent batch.');
v_batch_limit_reached := 3;
END IF;
ELSE
PERFORM update_step(v_step_id, 'OK','No issues found');
PERFORM gdb(p_debug, 'No issues found');
END IF;
IF v_batch_limit_reached <> 3 THEN
EXECUTE 'CREATE INDEX ON '||v_tmp_table||' ('||array_to_string(v_pk_name, ',')||')'; -- incase of large batch limit
EXECUTE 'ANALYZE '||v_tmp_table;
v_step_id := add_step(v_job_id,'Deleting records marked for update in local table');
perform gdb(p_debug,v_delete_sql);
execute v_delete_sql;
GET DIAGNOSTICS v_rowcount = ROW_COUNT;
PERFORM update_step(v_step_id, 'OK','Deleted '||v_rowcount||' records');
v_step_id := add_step(v_job_id,'Inserting new records into local table');
perform gdb(p_debug,v_insert_sql);
EXECUTE v_insert_sql;
GET DIAGNOSTICS v_rowcount = ROW_COUNT;
PERFORM update_step(v_step_id, 'OK','Inserted '||v_rowcount||' records');
END IF;
END IF; -- end v_limit IF
IF v_batch_limit_reached <> 3 THEN
v_step_id := add_step(v_job_id, 'Setting next lower boundary');
EXECUTE 'SELECT max('||v_control||') FROM '|| v_dest_table INTO v_last_value;
UPDATE refresh_config_updater set last_value = coalesce(v_last_value, CURRENT_TIMESTAMP), last_run = CURRENT_TIMESTAMP WHERE dest_table = p_destination;
PERFORM update_step(v_step_id, 'OK','Lower boundary value is: '||coalesce(v_last_value, CURRENT_TIMESTAMP));
PERFORM gdb(p_debug, 'Lower boundary value is: '||coalesce(v_last_value, CURRENT_TIMESTAMP));
END IF;
EXECUTE 'DROP TABLE IF EXISTS '||v_tmp_table;
PERFORM dblink_disconnect(v_dblink_name);
IF v_batch_limit_reached = 0 THEN
PERFORM close_job(v_job_id);
ELSIF v_batch_limit_reached = 2 THEN
-- Set final job status to level 2 (WARNING) to bring notice that the batch limit was reached and may need adjusting.
-- Preventive warning to keep replication from falling behind.
PERFORM fail_job(v_job_id, 2);
ELSIF v_batch_limit_reached = 3 THEN
-- Really bad. Critical alert!
PERFORM fail_job(v_job_id);
END IF;
-- Ensure old search path is reset for the current session
EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
PERFORM pg_advisory_unlock(hashtext('refresh_updater'), hashtext(v_job_name));
EXCEPTION
WHEN QUERY_CANCELED THEN
EXECUTE 'SELECT '||v_dblink_schema||'.dblink_get_connections() @> ARRAY['||quote_literal(v_dblink_name)||']' INTO v_link_exists;
IF v_link_exists THEN
EXECUTE 'SELECT '||v_dblink_schema||'.dblink_disconnect('||quote_literal(v_dblink_name)||')';
END IF;
PERFORM pg_advisory_unlock(hashtext('refresh_updater'), hashtext(v_job_name));
RAISE EXCEPTION '%', SQLERRM;
WHEN OTHERS THEN
EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||','||v_dblink_schema||''',''false'')';
IF v_job_id IS NULL THEN
EXECUTE 'SELECT '||v_jobmon_schema||'.add_job(''Refresh Updater: '||p_destination||''')' INTO v_job_id;
EXECUTE 'SELECT '||v_jobmon_schema||'.add_step('||v_job_id||', ''EXCEPTION before job logging started'')' INTO v_step_id;
END IF;
IF v_step_id IS NULL THEN
EXECUTE 'SELECT '||v_jobmon_schema||'.add_step('||v_job_id||', ''EXCEPTION before first step logged'')' INTO v_step_id;
END IF;
EXECUTE 'SELECT '||v_dblink_schema||'.dblink_get_connections() @> ARRAY['||quote_literal(v_dblink_name)||']' INTO v_link_exists;
IF v_link_exists THEN
EXECUTE 'SELECT '||v_dblink_schema||'.dblink_disconnect('||quote_literal(v_dblink_name)||')';
END IF;
EXECUTE 'SELECT '||v_jobmon_schema||'.update_step('||v_step_id||', ''CRITICAL'', ''ERROR: '||COALESCE(SQLERRM,'unknown')||''')';
EXECUTE 'SELECT '||v_jobmon_schema||'.fail_job('||v_job_id||')';
PERFORM pg_advisory_unlock(hashtext('refresh_updater'), hashtext(v_job_name));
RAISE EXCEPTION '%', SQLERRM;
END
$$;
/*
* Plain table refresh function.
*/
CREATE OR REPLACE FUNCTION refresh_table(p_destination text, p_truncate_cascade boolean DEFAULT NULL, p_debug boolean DEFAULT false) RETURNS void
LANGUAGE plpgsql
AS $$
DECLARE
v_adv_lock boolean;
v_cols text[];
v_cols_n_types text[];
v_condition text;
v_dblink int;
v_dblink_name text;
v_dblink_schema text;
v_dest_table text;
v_fetch_sql text;
v_filter text;
v_link_exists boolean;
v_old_search_path text;
v_post_script text[];
v_remote_sql text;
v_rowcount bigint := 0;
v_seq text;
v_seq_max bigint;
v_sequences text[];
v_source_table text;
v_total bigint := 0;
v_truncate_cascade boolean;
v_truncate_sql text;
BEGIN
SELECT nspname INTO v_dblink_schema FROM pg_namespace n, pg_extension e WHERE e.extname = 'dblink' AND e.extnamespace = n.oid;
v_dblink_name := 'mimeo_table_refresh_'||p_destination;
SELECT current_setting('search_path') INTO v_old_search_path;
EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_dblink_schema||',public'',''false'')';
v_adv_lock := pg_try_advisory_lock(hashtext('refresh_table'), hashtext(p_destination));
IF v_adv_lock = 'false' THEN
RAISE NOTICE 'Found concurrent job. Exiting gracefully';
EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
RETURN;
END IF;
SELECT source_table
, dest_table
, dblink
, filter
, condition
, sequences
, truncate_cascade
INTO v_source_table
, v_dest_table
, v_dblink
, v_filter
, v_condition
, v_sequences
, v_truncate_cascade
FROM refresh_config_table
WHERE dest_table = p_destination;
IF NOT FOUND THEN
RAISE EXCEPTION 'No configuration found for Refresh Table: %',p_destination;
END IF;
IF p_truncate_cascade IS NOT NULL THEN
v_truncate_cascade := p_truncate_cascade;
END IF;
v_truncate_sql := 'TRUNCATE TABLE '||v_dest_table;
IF v_truncate_cascade THEN
v_truncate_sql := v_truncate_sql || ' CASCADE';
RAISE NOTICE 'WARNING! If this table had foreign keys, you have just truncated all referencing tables as well!';
END IF;
EXECUTE v_truncate_sql;
PERFORM dblink_connect(v_dblink_name, @extschema@.auth(v_dblink));
v_remote_sql := 'SELECT array_agg(attname) as cols, array_agg(attname||'' ''||format_type(atttypid, atttypmod)::text) as cols_n_types FROM pg_attribute WHERE attrelid = '||quote_literal(v_source_table)||'::regclass AND attnum > 0 AND attisdropped is false';
IF v_filter IS NOT NULL THEN
v_remote_sql := v_remote_sql || ' AND ARRAY[attname::text] <@ '||quote_literal(v_filter);
END IF;
v_remote_sql := 'SELECT cols, cols_n_types FROM dblink('||quote_literal(v_dblink_name)||', ' || quote_literal(v_remote_sql) || ') t (cols text[], cols_n_types text[])';
EXECUTE v_remote_sql INTO v_cols, v_cols_n_types;
v_remote_sql := 'SELECT '|| array_to_string(v_cols, ',') ||' FROM '||v_source_table;
IF v_condition IS NOT NULL THEN
v_remote_sql := v_remote_sql || ' ' || v_condition;
END IF;
PERFORM dblink_open(v_dblink_name, 'mimeo_cursor', v_remote_sql);
v_rowcount := 0;
LOOP
v_fetch_sql := 'INSERT INTO '|| v_dest_table ||' ('|| array_to_string(v_cols, ',') ||')
SELECT '||array_to_string(v_cols, ',')||' FROM dblink_fetch('||quote_literal(v_dblink_name)||', ''mimeo_cursor'', 50000) AS ('||array_to_string(v_cols_n_types, ',')||')';
EXECUTE v_fetch_sql;
GET DIAGNOSTICS v_rowcount = ROW_COUNT;
EXIT WHEN v_rowcount = 0;
v_total := v_total + coalesce(v_rowcount, 0);
PERFORM gdb(p_debug,'Fetching rows in batches: '||v_total||' done so far.');
END LOOP;
PERFORM dblink_close(v_dblink_name, 'mimeo_cursor');
PERFORM dblink_disconnect(v_dblink_name);
-- Reset any sequences given in the parameter to their new value.
-- Checks all tables that use the given sequence to ensure it's the max for the entire database.
IF v_sequences IS NOT NULL THEN
FOREACH v_seq IN ARRAY v_sequences LOOP
SELECT sequence_max_value(c.oid) INTO v_seq_max FROM pg_class c JOIN pg_namespace n ON c.relnamespace = n.oid WHERE n.nspname ||'.'|| c.relname = v_seq;
IF v_seq_max IS NOT NULL THEN
PERFORM setval(v_seq, v_seq_max);
END IF;
END LOOP;
END IF;
UPDATE refresh_config_table set last_run = CURRENT_TIMESTAMP WHERE dest_table = v_dest_table;
PERFORM pg_advisory_unlock(hashtext('refresh_table'), hashtext(p_destination));
EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
EXCEPTION
WHEN QUERY_CANCELED OR OTHERS THEN
EXECUTE 'SELECT '||v_dblink_schema||'.dblink_get_connections() @> ARRAY['||quote_literal(v_dblink_name)||']' INTO v_link_exists;
IF v_link_exists THEN
EXECUTE 'SELECT '||v_dblink_schema||'.dblink_disconnect('||quote_literal(v_dblink_name)||')';
END IF;
PERFORM pg_advisory_unlock(hashtext('refresh_table'), hashtext(p_destination));
RAISE EXCEPTION '%', SQLERRM;
END
$$;
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