Function RM_Scan

app/redis-6.2.6/src/module.c:7682–7696

Scan API that allows a module to scan all the keys and value in * the selected db. * * Callback for scan implementation. * * void scan_callback(RedisModuleCtx *ctx, RedisModuleString *keyname, * RedisModuleKey *key, void *privdata); * * - `ctx`: the redis module context provided to for the scan. * - `keyname`: owned by the caller and need to be retained if used

 * memory, so it may make sense to just operate on the current key when
 * possible during the iteration, given that this is safe. */
int RM_Scan(RedisModuleCtx *ctx, RedisModuleScanCursor *cursor, RedisModuleScanCB fn, void *privdata) {
    if (cursor->done) {
        errno = ENOENT;
        return 0;
    }
    int ret = 1;
    ScanCBData data = { ctx, privdata, fn };
    cursor->cursor = dictScan(ctx->client->db->dict, cursor->cursor, moduleScanCallback, NULL, &data);
    if (cursor->cursor == 0) {
        cursor->done = 1;
        ret = 0;
    }
    errno = 0;
    return ret;
}

typedef void (*RedisModuleScanKeyCB)(RedisModuleKey *key, RedisModuleString *field, RedisModuleString *value, void *privdata);
typedef struct {