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#ifndef LIGHTNING_LIGHTNINGD_GOSSIP_BROADCAST_H
#define LIGHTNING_LIGHTNINGD_GOSSIP_BROADCAST_H
#include "config.h"
#include <ccan/intmap/intmap.h>
#include <ccan/list/list.h>
#include <ccan/short_types/short_types.h>
#include <ccan/tal/tal.h>
/* Common functionality to implement staggered broadcasts with replacement. */
struct queued_message {
int type;
/* Unique tag specifying the msg origin */
void *tag;
/* Serialized payload */
u8 *payload;
};
struct broadcast_state {
u32 next_index;
UINTMAP(struct queued_message *) broadcasts;
};
struct broadcast_state *new_broadcast_state(tal_t *ctx);
/* Queue a new message to be broadcast and replace any outdated
* broadcast. Replacement is done by comparing the `type` and the
* `tag`, if both match the old message is dropped from the queue. The
* new message is added to the top of the broadcast queue. Returns
* true if a previous entry with the same tag has been evicted. */
bool queue_broadcast(struct broadcast_state *bstate,
const int type,
const u8 *tag,
const u8 *payload);
/* Replace a queued message with @index, if it matches the type and
* tag for the new message. The new message will be queued with the
* next highest index. @index is updated to hold the index of the
* newly queued message*/
bool replace_broadcast(struct broadcast_state *bstate,
u64 *index,
const int type,
const u8 *tag,
const u8 *payload);
struct queued_message *next_broadcast_message(struct broadcast_state *bstate, u64 last_index);
#endif /* LIGHTNING_LIGHTNINGD_GOSSIP_BROADCAST_H */