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