v6-0001-Add-custom-PQsetNoticeReceiver-handlers-for-repli.patch
text/x-patch
Filename: v6-0001-Add-custom-PQsetNoticeReceiver-handlers-for-repli.patch
Type: text/x-patch
Part: 1
Patch
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Format: format-patch
Series: patch v6-0001
Subject: Add custom PQsetNoticeReceiver handlers for replication connection
| File | + | − |
|---|---|---|
| src/backend/replication/libpqwalreceiver/libpqwalreceiver.c | 3 | 0 |
| src/include/libpq/libpq-be-fe-helpers.h | 31 | 0 |
From 65061ce7de2ba20386a3d28a81c6ae0db005e9da Mon Sep 17 00:00:00 2001
From: Vignesh C <vignesh21@gmail.com>
Date: Wed, 16 Jul 2025 15:26:12 +0530
Subject: [PATCH v6 1/3] Add custom PQsetNoticeReceiver handlers for
replication connection
This patch introduces a custom notice receiver for replication
connections. The notice receiver captures messages and routes
them through ereport(), making them visible in local logs with
a prefix making it easy for diagnosis.
---
.../libpqwalreceiver/libpqwalreceiver.c | 3 ++
src/include/libpq/libpq-be-fe-helpers.h | 31 +++++++++++++++++++
2 files changed, 34 insertions(+)
diff --git a/src/backend/replication/libpqwalreceiver/libpqwalreceiver.c b/src/backend/replication/libpqwalreceiver/libpqwalreceiver.c
index f7b5d093681..886d99951dd 100644
--- a/src/backend/replication/libpqwalreceiver/libpqwalreceiver.c
+++ b/src/backend/replication/libpqwalreceiver/libpqwalreceiver.c
@@ -232,6 +232,9 @@ libpqrcv_connect(const char *conninfo, bool replication, bool logical,
errhint("Target server's authentication method must be changed, or set password_required=false in the subscription parameters.")));
}
+ PQsetNoticeReceiver(conn->streamConn, libpqsrv_notice_receiver,
+ "received message via replication");
+
/*
* Set always-secure search path for the cases where the connection is
* used to run SQL queries, so malicious users can't get control.
diff --git a/src/include/libpq/libpq-be-fe-helpers.h b/src/include/libpq/libpq-be-fe-helpers.h
index 16205b824fa..a697d6a0f2c 100644
--- a/src/include/libpq/libpq-be-fe-helpers.h
+++ b/src/include/libpq/libpq-be-fe-helpers.h
@@ -52,6 +52,7 @@ static inline void libpqsrv_connect_prepare(void);
static inline void libpqsrv_connect_internal(PGconn *conn, uint32 wait_event_info);
static inline PGresult *libpqsrv_get_result_last(PGconn *conn, uint32 wait_event_info);
static inline PGresult *libpqsrv_get_result(PGconn *conn, uint32 wait_event_info);
+static inline void libpqsrv_notice_receiver(void *arg, const PGresult *res);
/*
@@ -454,4 +455,34 @@ exit: ;
return error;
}
+/*
+ * libpqsrv_notice_receiver
+ *
+ * Custom notice receiver for libpq connections.
+ *
+ * This function is intended to be set via PQsetNoticeReceiver() so that
+ * NOTICE, WARNING, and similar messages from the connection are reported via
+ * ereport(), instead of being printed to stderr.
+ */
+static inline void
+libpqsrv_notice_receiver(void *arg, const PGresult *res)
+{
+ char *message;
+ int len;
+ char *prefix = (char *) arg;
+
+ /*
+ * Trim the trailing newline from the message text returned from
+ * PQresultErrorMessage(), as it always includes one, to produce cleaner
+ * log output.
+ */
+ message = PQresultErrorMessage(res);
+ len = strlen(message);
+ if (len > 0 && message[len - 1] == '\n')
+ len--;
+
+ ereport(LOG,
+ errmsg_internal("%s: %.*s", _(prefix), len, message));
+}
+
#endif /* LIBPQ_BE_FE_HELPERS_H */
--
2.43.0