async function GET()

in webui/js/source/base-http-extensions.js [79:131]

• 49 lines of code
• 14 McCabe index (conditional complexity)

async function GET(url, callback, state) {
    console.log("Fetching JSON resource at %s".format(url));
    let pkey = "GET-%s-%s".format(callback, url);
    let res;
    let res_json;
    state = state || {};
    state.url = url;
    if (state && state.cached === true && async_cache[url]) {
        console.log("Fetching %s from cache".format(url));
        res_json = async_cache[url];
    } else {
        try {
            console.log("putting %s in escrow...".format(url));
            async_escrow[pkey] = new Date(); // Log start of request in escrow dict
            const rv = await fetch(url, {
                credentials: 'same-origin'
            }); // Wait for resource...

            // Since this is an async request, the request may have been canceled
            // by the time we get a response. Only do callback if not.
            if (async_escrow[pkey] !== undefined) {
                res = rv;
            }
        } catch (e) {
            delete async_escrow[pkey]; // move out of escrow if failed
            console.log("The URL %s could not be fetched: %s".format(url, e));
            modal("An error occured", "An error occured while trying to fetch %s:\n%s".format(url, e), "error");
        }
    }
    if (res !== undefined || res_json !== undefined) {
        // We expect a 2xx return code (usually 200 or 201), snap otherwise
        if ((res_json) || (res.status >= 200 && res.status < 300)) {
            console.log("Successfully fetched %s".format(url))
            let js;
            if (res_json) {
                js = res_json;
            } else {
                js = await res.json();
                delete async_escrow[pkey]; // move out of escrow when fetched
                async_cache[url] = js;
            }
            if (callback) {
                callback(state, js);
            } else {
                console.log("No callback function was registered for %s, ignoring result.".format(url));
            }
        } else {
            console.log("URL %s returned HTTP code %u, snapping!".format(url, res.status));
            delete async_escrow[pkey]; // move out of escrow when fetched
            async_snap(res);
        }
    }
}