Function RM_KeyAtPos

app/redis-6.2.6/src/module.c:772–785

When a module command is called in order to obtain the position of * keys, since it was flagged as "getkeys-api" during the registration, * the command implementation checks for this special call using the * RedisModule_IsKeysPositionRequest() API and uses this function in * order to report keys, like in the following example: * * if (RedisModule_IsKeysPositionRequest(ctx)) { *

 *  keys are at fixed positions. This interface is only used for commands
 *  with a more complex structure. */
void RM_KeyAtPos(RedisModuleCtx *ctx, int pos) {
    if (!(ctx->flags & REDISMODULE_CTX_KEYS_POS_REQUEST) || !ctx->keys_result) return;
    if (pos <= 0) return;

    getKeysResult *res = ctx->keys_result;

    /* Check overflow */
    if (res->numkeys == res->size) {
        int newsize = res->size + (res->size > 8192 ? 8192 : res->size);
        getKeysPrepareResult(res, newsize);
    }

    res->keys[res->numkeys++] = pos;
}

/* Helper for RM_CreateCommand(). Turns a string representing command
 * flags into the command flags used by the Redis core.