56 lines
1.3 KiB
JavaScript
56 lines
1.3 KiB
JavaScript
'use strict';
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const API = (() => {
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const preparing = promisify(chrome.runtime.getBackgroundPage.bind(chrome.runtime))()
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.catch(() => null);
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const runtimeSendMessage = promisify(chrome.runtime.sendMessage.bind(chrome.runtime));
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return new Proxy(() => {}, {
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get: (target, name) =>
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(...args) => invokeBG(name, args),
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});
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function sendMessage(msg) {
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return runtimeSendMessage(msg)
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.then(result => {
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if (result.__ERROR__) {
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throw new Error(result.__ERROR__);
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}
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return result;
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});
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}
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function promisify(fn) {
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return (...args) =>
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new Promise((resolve, reject) => {
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fn(...args, (...result) => {
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if (chrome.runtime.lastError) {
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reject(chrome.runtime.lastError);
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return;
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}
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resolve(
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result.length === 0 ? undefined :
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result.length === 1 ? result[1] : result
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);
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});
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});
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}
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function invokeBG(name, args) {
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return preparing.then(BG => {
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if (!BG) {
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return sendMessage({
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method: 'invokeAPI',
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name,
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args
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});
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}
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// FIXME: why deep-copying input/output?
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if (BG !== window) {
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args = BG.deepCopy(args);
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}
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return BG.API_METHODS[name](...args)
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.then(BG.deepCopy);
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});
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}
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})();
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