discover: Maintain a backlog of status updates

Add status updates to a persistent list in the discover_server struct,
and send each client the backlog on connect. This avoids clients missing
useful messages from early init. Clients will only show this in the
backlog screen to avoid flooding the client's status line.

Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/lib/pb-protocol/pb-protocol.c b/lib/pb-protocol/pb-protocol.c
index 8bc8820..65a1e93 100644
--- a/lib/pb-protocol/pb-protocol.c
+++ b/lib/pb-protocol/pb-protocol.c
@@ -217,8 +217,9 @@ int pb_protocol_boot_len(const struct boot_command *boot)
 
 int pb_protocol_boot_status_len(const struct status *status)
 {
-	return  4 +
+	return  4 +	/* type */
 		4 + optional_strlen(status->message) +
+		4 +	/* backlog */
 		4;
 }
 
@@ -410,6 +411,9 @@ int pb_protocol_serialise_boot_status(const struct status *status,
 
 	pos += pb_protocol_serialise_string(pos, status->message);
 
+	*(bool *)pos = __cpu_to_be32(status->backlog);
+	pos += sizeof(bool);
+
 	assert(pos <= buf + buf_len);
 	(void)buf_len;
 
@@ -847,6 +851,10 @@ int pb_protocol_deserialise_boot_status(struct status *status,
 	if (read_string(status, &pos, &len, &status->message))
 		goto out;
 
+	/* backlog */
+	status->backlog = *(bool *)pos;
+	pos += sizeof(status->backlog);
+
 	rc = 0;
 
 out: