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background.js
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background.js
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//HACK: some way to reload module?
var jspy;
var DEBUG = false;
var waiting_callback;
function initModule(callback) {
if (DEBUG) console.log('JsPy init');
if (jspy) {
jspy.parentNode.removeChild(jspy);
}
jspy = document.createElement('embed');
jspy.src = '/jspy/jspy.nmf';
jspy.type = 'application/x-nacl';
document.body.appendChild(jspy);
waiting_callback = function() { console.error('Should never be called'); };
jspy.addEventListener('load', function() { initModuleMessageHandler(callback); });
}
function initModuleMessageHandler(initCallback) {
if (DEBUG) console.log('JsPy Module loaded');
waiting_callback = null;
jspy.addEventListener('message', messageHandler);
initCallback();
}
function messageHandler(e) {
if (DEBUG) console.log('From JsPy:', e.data);
if (!waiting_callback) {
console.error('No waiting callback');
} else {
waiting_callback(e.data);
waiting_callback = null;
}
}
function handleContentScriptMessage(msg, sender, sendResponse) {
if (DEBUG) console.log('To JsPy:', msg);
if (msg === 'init') {
initModule(sendResponse);
return;
}
if (waiting_callback) {
sendResponse('stderr:JSPY error: outstanding callback');
return;
}
waiting_callback = sendResponse;
jspy.postMessage(msg);
}
chrome.extension.onRequest.addListener(handleContentScriptMessage);