wal_utils: Add more error checks for parsing

wal_utils/expected/parse_wal_history.out

@@ -25,4 +25,26 @@ SELECT parse_wal_history(data) FROM history_data;
  (7,0/189BEB38,0/249BEB38)
 (6 rows)
+-- Sanity checks with some failures
+-- Timeline number is not an integer.
+TRUNCATE history_data;
+INSERT INTO history_data VALUES ('not_integer_tli 0/249BEB38 string');
+SELECT parse_wal_history(data) FROM history_data;
+ERROR:  syntax error in history file: not_integer_tli 0/249BEB38 string
+HINT:  Expected a numeric timeline ID.
+-- Not three fields
+TRUNCATE history_data;
+INSERT INTO history_data VALUES ('1 not_lsn');
+SELECT parse_wal_history(data) FROM history_data;
+ERROR:  syntax error in history file: 1 not_lsn
+HINT:  Expected a write-ahead log switchpoint location.
+-- Timelines need to be increasing
+TRUNCATE history_data;
+INSERT INTO history_data VALUES (
+'2       0/117BEB70      no recovery target specified
+1       0/09D4F390      no recovery target specified
+');
+SELECT parse_wal_history(data) FROM history_data;
+ERROR:  invalid data in history file: 1       0/09D4F390      no recovery target specified
+HINT:  Timeline IDs must be in increasing sequence.
 DROP TABLE history_data;

wal_utils/sql/parse_wal_history.sql

@@ -17,4 +17,22 @@ INSERT INTO history_data VALUES (
 7       0/249BEB38      no recovery target specified
 ');
 SELECT parse_wal_history(data) FROM history_data;
+
+-- Sanity checks with some failures
+-- Timeline number is not an integer.
+TRUNCATE history_data;
+INSERT INTO history_data VALUES ('not_integer_tli 0/249BEB38 string');
+SELECT parse_wal_history(data) FROM history_data;
+-- Not three fields
+TRUNCATE history_data;
+INSERT INTO history_data VALUES ('1 not_lsn');
+SELECT parse_wal_history(data) FROM history_data;
+-- Timelines need to be increasing
+TRUNCATE history_data;
+INSERT INTO history_data VALUES (
+'2       0/117BEB70      no recovery target specified
+1       0/09D4F390      no recovery target specified
+');
+SELECT parse_wal_history(data) FROM history_data;
+
 DROP TABLE history_data;