Define stream pressure negotiation and timestamp metric snapshots

src/stream/stream_wire.h

@@ -4,22 +4,28 @@
 #define STREAM_WIRE_H
 
 #include "stream_proto.h"
+#include "stream_metrics.h"
 
-#define STREAM_WIRE_VERSION 1
+#define STREAM_WIRE_VERSION 2
 #define STREAM_WIRE_HEADER 52
 #define STREAM_PATH_MAX 32
 #define STREAM_END_SIZE 106
-#define STREAM_INFO_SIZE 29 /* actual:8, first:8, last:8, n:1, r:1, block_size:2, path_count:1 */
+#define STREAM_METRIC_WIRE_SIZE 49
+#define STREAM_INFO_METRIC_OFF 36
+#define STREAM_INFO_PATH_OFF (STREAM_INFO_METRIC_OFF + STREAM_METRIC_WIRE_SIZE)
+#define STREAM_INFO_SIZE (STREAM_INFO_PATH_OFF + 1) /* probe:8, границы/FEC:28, метрики:49, count:1 */
+#define STREAM_OVERLOAD_MAX 64
+#define STREAM_OVERLOAD_HEADER 18
 
 enum stream_command {
     STREAM_CMD_INFO_REQ = 1, STREAM_CMD_INFO_RESP, STREAM_CMD_SUBSCRIBE, STREAM_CMD_ACCEPT,
     STREAM_CMD_REJECT, STREAM_CMD_RENEW, STREAM_CMD_UNSUBSCRIBE, STREAM_CMD_CLOSED,
-    STREAM_CMD_DATA, STREAM_CMD_GAP, STREAM_CMD_END, STREAM_CMD_REVERSE_REQ
+    STREAM_CMD_DATA, STREAM_CMD_GAP, STREAM_CMD_END, STREAM_CMD_REVERSE_REQ, STREAM_CMD_OVERLOAD, STREAM_CMD_OVERLOAD_SELECT
 };
 enum stream_reject {
     STREAM_REASON_STOPPED = 1, STREAM_REASON_POSITION, STREAM_REASON_EXPIRED, STREAM_REASON_STALE,
     STREAM_REASON_CONFLICT, STREAM_REASON_LIMIT, STREAM_REASON_LOOP, STREAM_REASON_TRANSPORT,
-    STREAM_REASON_LEASE, STREAM_REASON_MEMBER, STREAM_REASON_PROTOCOL
+    STREAM_REASON_LEASE, STREAM_REASON_MEMBER, STREAM_REASON_PROTOCOL, STREAM_REASON_OVERLOAD
 };
 struct stream_path { uint64_t nodes[STREAM_PATH_MAX]; uint8_t count; };
 struct stream_message {
@@ -37,6 +43,8 @@ void stream_wire_header(uint8_t *wire, const struct stream_message *message);
 int stream_path_validate(const struct stream_path *path, uint64_t source, uint64_t sender, uint64_t forbidden);
 int stream_path_parse(const uint8_t *wire, size_t length, struct stream_path *path, size_t *used);
 size_t stream_path_write(uint8_t *wire, const struct stream_path *path);
+void stream_metric_write(uint8_t *wire, const struct stream_metric_snapshot *snapshot, int valid);
+int stream_metric_read(const uint8_t *wire, struct stream_metric_snapshot *snapshot, int *valid);
 int stream_end_sign(const struct stream_descriptor *descriptor, uint64_t last, const uint8_t key[32], uint8_t wire[STREAM_END_SIZE]);
 int stream_end_verify(const struct stream_descriptor *descriptor, const uint8_t key[32], const uint8_t *wire, size_t length,
                       uint64_t *last);