injection_points: Add injection_points_list()

This function can be used to retrieve the information about all the
injection points attached to a cluster, providing coverage for
InjectionPointList() introduced in 7b2eb72b1b8c.

The original proposal turned around a system function, but that would
not be backpatchable to stable branches.  It was also a bit weird to
have a system function that fails depending on if the build allows
injection points or not.

Reviewed-by: Aleksander Alekseev <aleksander@timescale.com>
Reviewed-by: Rahila Syed <rahilasyed90@gmail.com>
Discussion: https://postgr.es/m/Z_xYkA21KyLEHvWR@paquier.xyz

1 files changed, 7 insertions, 0 deletions

diff --git a/src/test/modules/injection_points/sql/injection_points.sql b/src/test/modules/injection_points/sql/injection_points.sql
index d9748331c77..874421e9c11 100644
--- a/src/test/modules/injection_points/sql/injection_points.sql
+++ b/src/test/modules/injection_points/sql/injection_points.sql
@@ -18,6 +18,9 @@ SELECT injection_points_attach('TestInjectionError', 'error');
 SELECT injection_points_attach('TestInjectionLog', 'notice');
 SELECT injection_points_attach('TestInjectionLog2', 'notice');
 
+SELECT point_name, library, function FROM injection_points_list()
+  ORDER BY point_name COLLATE "C";
+
 SELECT injection_points_run('TestInjectionBooh'); -- nothing
 SELECT injection_points_run('TestInjectionLog2'); -- notice
 SELECT injection_points_run('TestInjectionLog2', NULL); -- notice
@@ -85,5 +88,9 @@ SELECT injection_points_detach('TestConditionError');
 SELECT injection_points_attach('TestConditionLocal1', 'error');
 SELECT injection_points_detach('TestConditionLocal1');
 
+-- No points should be left around.
+SELECT point_name, library, function FROM injection_points_list()
+  ORDER BY point_name COLLATE "C";
+
 DROP EXTENSION injection_points;
 DROP FUNCTION wait_pid;