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connections.js
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connections.js
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/**
* @author Abtin Khodadadi <[email protected]>
*/
function convert_text_to_map(text, conversion_func){
if (text == "" || text == null) {return null;}
var obj = JSON.parse(text, conversion_func);
return obj;
}
function save_map_in_cache(rm, id_str){
var json_str = JSON.stringify(rm);
var today = new Date();
var d = "CACHED_DATE_"+id_str;
chrome.storage.local.set({[id_str]: json_str, [d]: today.toString()}, function() {
// Notify that we saved.
console.log(id_str + ' was saved in cache at ' + today);
});
}
function fetch_xml_and_parse(url, parse_DOM_func, main_func){
qr = new XMLHttpRequest();
qr.onreadystatechange=function(){
if (this.readyState == 4 && this.status == 200) {
var xmlDOM = this.responseXML;
var xml_map_list = parse_DOM_func(xmlDOM);
save_map_in_cache(xml_map_list, make_id_str_from(url));
main_func(xml_map_list);
}
}
qr.open('get', url);
qr.send();
};
function make_id_str_from(url){return url.slice(-8);}
function load_cache_begin(url, validate_cache_func, conversion_func, parse_DOM_func, main_func){
var xml_map_list;
var date;
id_str = make_id_str_from(url);
var d = "CACHED_DATE_"+id_str;
chrome.storage.local.get([id_str, d], function(result){
console.log(result)
xml_map_list = convert_text_to_map(result[id_str], conversion_func);
date = new Date(result[d]);
valid = validate_cache_func(date, xml_map_list);
if (!valid){
fetch_xml_and_parse(url, parse_DOM_func, main_func);
}
else{
main_func(xml_map_list);
}
});
}