zulip/static/js/local_message.js

45 lines
1.4 KiB
JavaScript
Raw Normal View History

import {all_messages_data} from "./all_messages_data";
import * as blueslip from "./blueslip";
import {page_params} from "./page_params";
function truncate_precision(float) {
return Number.parseFloat(float.toFixed(3));
}
export const get_next_id_float = (function () {
const already_used = new Set();
return function () {
const local_id_increment = 0.01;
let latest = page_params.max_message_id;
if (all_messages_data.last() !== undefined) {
latest = all_messages_data.last().id;
}
latest = Math.max(0, latest);
const local_id_float = truncate_precision(latest + local_id_increment);
if (already_used.has(local_id_float)) {
// If our id is already used, it is probably an edge case like we had
// to abort a very recent message.
blueslip.warn("We don't reuse ids for local echo.");
return undefined;
}
if (local_id_float % 1 > local_id_increment * 5) {
blueslip.warn("Turning off local echo for this message to let host catch up");
return undefined;
}
if (local_id_float % 1 === 0) {
// The logic to stop at 0.05 should prevent us from ever wrapping around
// to the next integer.
blueslip.error("Programming error");
return undefined;
}
already_used.add(local_id_float);
return local_id_float;
};
})();