60 lines
2.1 KiB
JavaScript
60 lines
2.1 KiB
JavaScript
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/**
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* Repeatedly sending a message to target tab until the response is detected good.
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* @param {object} tab the table where to send the message
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* @param {object} req the request data.
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* @param {function} cond success condition function, r:any=>boolean
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* @param {number} interval retry interval, default: 500ms.
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* @param {number} limit retry limit, default: 0, no limit.
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* @param {string} log messages logged to console.
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* @return {Promise} a promise of the response.
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*/
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function sendMessage(tab, req, log, cond, interval, limit = 0) {
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interval = interval || 500;
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limit = limit && !isNaN(limit) ? limit : 0;
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count = 0;
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return new Promise((resolve, reject) => {
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loop();
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async function loop() {
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// console.log("request for", req.action);
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let tabAvailable = await getTabByID(tab.id);
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if (!tabAvailable) {
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reject("Task interrupted due to the target tab is closed.");
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return;
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}
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if (limit && count >= limit) {
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reject(`sendMessage loop limit ${limit} reached.`);
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return;
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}
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count++;
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chrome.tabs.sendMessage(tab.id, req, r => {
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// check error but do nothing.
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// do not interrupt promise chains even if error, or the task always fail when:
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// a tab is newly created, and the content scripts won't have time to initialize
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chrome.runtime.lastError;
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let flag = !cond || cond(r);
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if (log) console.log(log, flag ? '(OK)' : '(failed)');
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if (flag) {
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resolve(r);
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} else {
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setTimeout(() => {
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loop();
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}, interval);
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}
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});
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}
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});
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}
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chrome.runtime.onMessage.addListener(function (message, sender, sendResponse) {
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if (!message.action || !message.action.startsWith(EXT_NAME)) {
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return;
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}
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sendResponse("Calling from user pages is not allowed.");
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return;
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});
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