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fb4d8fe | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 | import type { Bot } from "grammy";
import { buildTelegramThreadParams } from "./bot/helpers.js";
const TELEGRAM_DRAFT_MAX_CHARS = 4096;
const DEFAULT_THROTTLE_MS = 300;
export type TelegramDraftStream = {
update: (text: string) => void;
flush: () => Promise<void>;
stop: () => void;
};
export function createTelegramDraftStream(params: {
api: Bot["api"];
chatId: number;
draftId: number;
maxChars?: number;
messageThreadId?: number;
throttleMs?: number;
log?: (message: string) => void;
warn?: (message: string) => void;
}): TelegramDraftStream {
const maxChars = Math.min(params.maxChars ?? TELEGRAM_DRAFT_MAX_CHARS, TELEGRAM_DRAFT_MAX_CHARS);
const throttleMs = Math.max(50, params.throttleMs ?? DEFAULT_THROTTLE_MS);
const rawDraftId = Number.isFinite(params.draftId) ? Math.trunc(params.draftId) : 1;
const draftId = rawDraftId === 0 ? 1 : Math.abs(rawDraftId);
const chatId = params.chatId;
const threadParams = buildTelegramThreadParams(params.messageThreadId);
let lastSentText = "";
let lastSentAt = 0;
let pendingText = "";
let inFlight = false;
let timer: ReturnType<typeof setTimeout> | undefined;
let stopped = false;
const sendDraft = async (text: string) => {
if (stopped) {
return;
}
const trimmed = text.trimEnd();
if (!trimmed) {
return;
}
if (trimmed.length > maxChars) {
// Drafts are capped at 4096 chars. Stop streaming once we exceed the cap
// so we don't keep sending failing updates or a truncated preview.
stopped = true;
params.warn?.(`telegram draft stream stopped (draft length ${trimmed.length} > ${maxChars})`);
return;
}
if (trimmed === lastSentText) {
return;
}
lastSentText = trimmed;
lastSentAt = Date.now();
try {
await params.api.sendMessageDraft(chatId, draftId, trimmed, threadParams);
} catch (err) {
stopped = true;
params.warn?.(
`telegram draft stream failed: ${err instanceof Error ? err.message : String(err)}`,
);
}
};
const flush = async () => {
if (timer) {
clearTimeout(timer);
timer = undefined;
}
if (inFlight) {
schedule();
return;
}
const text = pendingText;
const trimmed = text.trim();
if (!trimmed) {
if (pendingText === text) {
pendingText = "";
}
if (pendingText) {
schedule();
}
return;
}
pendingText = "";
inFlight = true;
try {
await sendDraft(text);
} finally {
inFlight = false;
}
if (pendingText) {
schedule();
}
};
const schedule = () => {
if (timer) {
return;
}
const delay = Math.max(0, throttleMs - (Date.now() - lastSentAt));
timer = setTimeout(() => {
void flush();
}, delay);
};
const update = (text: string) => {
if (stopped) {
return;
}
pendingText = text;
if (inFlight) {
schedule();
return;
}
if (!timer && Date.now() - lastSentAt >= throttleMs) {
void flush();
return;
}
schedule();
};
const stop = () => {
stopped = true;
pendingText = "";
if (timer) {
clearTimeout(timer);
timer = undefined;
}
};
params.log?.(
`telegram draft stream ready (draftId=${draftId}, maxChars=${maxChars}, throttleMs=${throttleMs})`,
);
return { update, flush, stop };
}
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