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nostrdb: add ability to register a subscription callback

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Since Damus iOS is not an immediate-mode UI like android, we would
rather not poll for results. Instead we need a way to register a
callback function that is called when we get new subscription results.

This is also useful on the android side, allowing us to request a new
frame to draw when we have new results, instead of drawing every second.

Signed-off-by: William Casarin <jb55@jb55.com>
This commit is contained in:
William Casarin
2024-04-04 21:22:35 +01:00
committed by Daniel D’Aquino
parent 30c9bc7db7
commit a562be009d
2 changed files with 34 additions and 3 deletions
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6
nostrdb/src/nostrdb.h
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@@ -64,6 +64,9 @@ struct ndb_keypair {
// function pointer for controlling what to do after we parse an id
typedef enum ndb_idres (*ndb_id_fn)(void *, const char *);
// callback function for when we receive new subscription results
typedef void (*ndb_sub_fn)(void *, uint64_t subid);
// id callback + closure data
struct ndb_id_cb {
ndb_id_fn fn;
@@ -256,6 +259,8 @@ struct ndb_config {
size_t mapsize;
void *filter_context;
ndb_ingest_filter_fn ingest_filter;
void *sub_cb_ctx;
ndb_sub_fn sub_cb;
};
struct ndb_text_search_config {
@@ -430,6 +435,7 @@ void ndb_config_set_ingest_threads(struct ndb_config *config, int threads);
void ndb_config_set_flags(struct ndb_config *config, int flags);
void ndb_config_set_mapsize(struct ndb_config *config, size_t mapsize);
void ndb_config_set_ingest_filter(struct ndb_config *config, ndb_ingest_filter_fn fn, void *);
void ndb_config_set_subscription_callback(struct ndb_config *config, ndb_sub_fn fn, void *ctx);
// HELPERS
int ndb_calculate_id(struct ndb_note *note, unsigned char *buf, int buflen);