From 45b110edb2b4fd39c56f433c5c0a7f93cd29d4da Mon Sep 17 00:00:00 2001
From: Nic Eigel <nic@eigel.ch>
Date: Tue, 16 Jan 2024 22:37:07 +0100
Subject: progress on auditor helpers

---
 src/auditordb/plugin_auditordb_postgres.c | 66 +++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)

(limited to 'src/auditordb/plugin_auditordb_postgres.c')

diff --git a/src/auditordb/plugin_auditordb_postgres.c b/src/auditordb/plugin_auditordb_postgres.c
index dc66990ba..2366eb69f 100644
--- a/src/auditordb/plugin_auditordb_postgres.c
+++ b/src/auditordb/plugin_auditordb_postgres.c
@@ -165,6 +165,69 @@ postgres_create_tables (void *cls)
 }
 
 
+/**
+ * Register callback to be invoked on events of type @a es.
+ *
+ * @param cls database context to use
+ * @param es specification of the event to listen for
+ * @param timeout how long to wait for the event
+ * @param cb function to call when the event happens, possibly
+ *         mulrewardle times (until cancel is invoked)
+ * @param cb_cls closure for @a cb
+ * @return handle useful to cancel the listener
+ */
+static struct GNUNET_DB_EventHandler *
+postgres_event_listen (void *cls,
+                       const struct GNUNET_DB_EventHeaderP *es,
+                       struct GNUNET_TIME_Relative timeout,
+                       GNUNET_DB_EventCallback cb,
+                       void *cb_cls)
+{
+  struct PostgresClosure *pg = cls;
+
+  return GNUNET_PQ_event_listen (pg->conn,
+                                 es,
+                                 timeout,
+                                 cb,
+                                 cb_cls);
+}
+
+
+/**
+ * Stop notifications.
+ *
+ * @param eh handle to unregister.
+ */
+static void
+postgres_event_listen_cancel (struct GNUNET_DB_EventHandler *eh)
+{
+  GNUNET_PQ_event_listen_cancel (eh);
+}
+
+
+/**
+ * Notify all that listen on @a es of an event.
+ *
+ * @param cls database context to use
+ * @param es specification of the event to generate
+ * @param extra additional event data provided
+ * @param extra_size number of bytes in @a extra
+ */
+static void
+postgres_event_notify (void *cls,
+                       const struct GNUNET_DB_EventHeaderP *es,
+                       const void *extra,
+                       size_t extra_size)
+{
+  struct PostgresClosure *pg = cls;
+
+  return GNUNET_PQ_event_notify (pg->conn,
+                                 es,
+                                 extra,
+                                 extra_size);
+}
+
+
 /**
  * Connect to the db if the connection does not exist yet.
  *
@@ -399,6 +462,9 @@ libtaler_plugin_auditordb_postgres_init (void *cls)
   plugin->preflight = &postgres_preflight;
   plugin->drop_tables = &postgres_drop_tables;
   plugin->create_tables = &postgres_create_tables;
+  plugin->event_listen = &postgres_event_listen;
+  plugin->event_listen_cancel = &postgres_event_listen_cancel;
+  plugin->event_notify = &postgres_event_notify;
   plugin->start = &postgres_start;
   plugin->commit = &postgres_commit;
   plugin->rollback = &postgres_rollback;
-- 
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