MT#61822 add metric for cache size

Change-Id: I775839f6482b24fce216e32c1589d7eb91174c72

daemon/media_player.c

@@ -1186,6 +1186,7 @@ static bool media_player_play_start(struct media_player *mp, const rtp_payload_t
 }
 
 static void media_player_media_file_free(struct media_player_media_file *fo) {
+	RTPE_GAUGE_ADD(media_cache, -1 * (ssize_t) fo->blob.len);
 	g_free(fo->blob.s);
 }
 
@@ -1212,6 +1213,7 @@ static struct media_player_media_file *media_player_media_file_new(str blob) {
 			media_player_media_file_free);
 	fo->blob = blob;
 	fo->blob.dup = call_ref; // string is allocated by reference on `fo`
+	RTPE_GAUGE_ADD(media_cache, blob.len);
 	fo->ts = time(NULL);
 	return fo;
 }

daemon/statistics.c

@@ -337,6 +337,8 @@ stats_metric_q *statistics_gather_metrics(struct interface_sampled_rate_stats *i
 	METRIC("sessionstotal", "Total sessions", UINT64F, UINT64F, cur_sessions);
 	METRIC("transcodedmedia", "Transcoded media", UINT64F, UINT64F, atomic64_get_na(&rtpe_stats_gauge.transcoded_media));
 	PROM("transcoded_media", "gauge");
+	METRIC("mediacache", "Media cache size", UINT64F, UINT64F, atomic64_get_na(&rtpe_stats_gauge.media_cache));
+	PROM("media_cache", "gauge");
 
 	METRIC("packetrate_user", "Packets per second (userspace)", UINT64F, UINT64F,
 			atomic64_get_na(&rtpe_stats_rate.packets_user));

include/gauge_stats_fields.inc

@@ -7,3 +7,4 @@ F(mixed_sessions)
 F(userspace_streams)
 F(kernel_only_streams)
 F(kernel_user_streams)
+F(media_cache)

t/test-stats.c

@@ -340,6 +340,10 @@ int main(void) {
 			"transcodedmedia\n"
 			"0\n"
 			"0\n"
+			"Media cache size\n"
+			"mediacache\n"
+			"0\n"
+			"0\n"
 			"Packets per second (userspace)\n"
 			"packetrate_user\n"
 			"0\n"
@@ -1468,6 +1472,10 @@ int main(void) {
 			"transcodedmedia\n"
 			"0\n"
 			"0\n"
+			"Media cache size\n"
+			"mediacache\n"
+			"0\n"
+			"0\n"
 			"Packets per second (userspace)\n"
 			"packetrate_user\n"
 			"0\n"
@@ -2593,6 +2601,10 @@ int main(void) {
 			"transcodedmedia\n"
 			"0\n"
 			"0\n"
+			"Media cache size\n"
+			"mediacache\n"
+			"0\n"
+			"0\n"
 			"Packets per second (userspace)\n"
 			"packetrate_user\n"
 			"0\n"
@@ -3737,6 +3749,10 @@ int main(void) {
 			"transcodedmedia\n"
 			"0\n"
 			"0\n"
+			"Media cache size\n"
+			"mediacache\n"
+			"0\n"
+			"0\n"
 			"Packets per second (userspace)\n"
 			"packetrate_user\n"
 			"0\n"
@@ -4870,6 +4886,10 @@ int main(void) {
 			"transcodedmedia\n"
 			"0\n"
 			"0\n"
+			"Media cache size\n"
+			"mediacache\n"
+			"0\n"
+			"0\n"
 			"Packets per second (userspace)\n"
 			"packetrate_user\n"
 			"0\n"
@@ -5998,6 +6018,10 @@ int main(void) {
 			"transcodedmedia\n"
 			"0\n"
 			"0\n"
+			"Media cache size\n"
+			"mediacache\n"
+			"0\n"
+			"0\n"
 			"Packets per second (userspace)\n"
 			"packetrate_user\n"
 			"0\n"
@@ -7128,6 +7152,10 @@ int main(void) {
 			"transcodedmedia\n"
 			"0\n"
 			"0\n"
+			"Media cache size\n"
+			"mediacache\n"
+			"0\n"
+			"0\n"
 			"Packets per second (userspace)\n"
 			"packetrate_user\n"
 			"0\n"