gistfile1.txt

    async function fetchMarketJSON(forceFetch = false) {
        let sendReq = (typeof GM.xmlHttpRequest === 'function')? GM.xmlHttpRequest : GM_xmlhttpRequest;

        if (typeof sendReq !== 'function') {
            console.error("fetchMarketJSON GM.xmlHttpRequest null function");
            isUsingLocalMarketJson = true;
            const jsonStr = MARKET_JSON_LOCAL_BACKUP;
            const jsonObj = JSON.parse(jsonStr);
            if (jsonObj && jsonObj.time && jsonObj.market) {
                jsonObj.market.Coin.ask = 1;
                jsonObj.market.Coin.bid = 1;
                console.log(jsonObj);
                localStorage.setItem("MWITools_marketAPI_timestamp", Date.now());
                localStorage.setItem("MWITools_marketAPI_json", JSON.stringify(jsonObj));
                return jsonObj;
            }
        }

        if (
            !forceFetch &&
            localStorage.getItem("MWITools_marketAPI_timestamp") &&
            Date.now() - localStorage.getItem("MWITools_marketAPI_timestamp") < 900000
        ) {
            return JSON.parse(localStorage.getItem("MWITools_marketAPI_json"));
        }

        console.log("fetchMarketJSON fetch github start");
        let jsonStr = null;
        jsonStr = await new Promise((resolve, reject) => {
            sendReq({
                url: MARKET_API_URL,
                method: "GET",
                synchronous: true,
                timeout: 5000,
                onload: async (response) => {
                    if (response.status == 200) {
                        console.log("fetchMarketJSON fetch github success 200");
                        resolve(response.responseText);
                    } else {
                        console.error("fetchMarketJSON fetch github onload with HTTP status failure " + response.status);
                        resolve(null);
                    }
                },
                onabort: () => {
                    console.error("fetchMarketJSON fetch github onabort");
                    resolve(null);
                },
                onerror: () => {
                    console.error("fetchMarketJSON fetch github onerror");
                    resolve(null);
                },
                ontimeout: () => {
                    console.error("fetchMarketJSON fetch github ontimeout");
                    resolve(null);
                },
            });
        });

        if (jsonStr === null && settingsMap.tryBackupApiUrl.isTrue) {
            console.log("fetchMarketJSON fetch backup start");
            jsonStr = await new Promise((resolve, reject) => {
                sendReq({
                    url: MARKET_API_URL_BACKUP,
                    method: "GET",
                    synchronous: true,
                    timeout: 5000,
                    onload: async (response) => {
                        if (response.status == 200) {
                            console.log("fetchMarketJSON fetch backup success 200");
                            resolve(response.responseText);
                        } else {
                            console.error("fetchMarketJSON fetch backup onload with HTTP status failure " + response.status);
                            resolve(null);
                        }
                    },
                    onabort: () => {
                        console.error("fetchMarketJSON fetch backup onabort");
                        resolve(null);
                    },
                    onerror: () => {
                        console.error("fetchMarketJSON fetch backup onerror");
                        resolve(null);
                    },
                    ontimeout: () => {
                        console.error("fetchMarketJSON fetch backup ontimeout");
                        resolve(null);
                    },
                });
            });
        }

        if (!jsonStr) {
            console.error("fetchMarketJSON network error, using local version");
            isUsingLocalMarketJson = true;
            jsonStr = MARKET_JSON_LOCAL_BACKUP;
        } else {
            isUsingLocalMarketJson = false;
        }

        const jsonObj = JSON.parse(jsonStr);
        if (jsonObj && jsonObj.time && jsonObj.market) {
            jsonObj.market.Coin.ask = 1;
            jsonObj.market.Coin.bid = 1;
            console.log(jsonObj);
            localStorage.setItem("MWITools_marketAPI_timestamp", Date.now());
            localStorage.setItem("MWITools_marketAPI_json", JSON.stringify(jsonObj));
            return jsonObj;
        }
        console.error("MWITools: fetchMarketJSON JSON.parse error");
        localStorage.setItem("MWITools_marketAPI_timestamp", 0);
        localStorage.setItem("MWITools_marketAPI_json", "");
        return null;
    }