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const doFetch = async (req) => {
let res, jsonRes;
try {
res = await fetch(req);
jsonRes = await res.json();
} catch (e) {
if (e instanceof SyntaxError)
e = new Error(`status ${res.status}, empty (or invalid) response body`);
console.error(`api call ${req.method} ${req.url}: unexpected error:`, e);
throw e;
}
if (jsonRes.error) {
console.error(
`api call ${req.method} ${req.url}: application error:`,
res.status,
jsonRes.error,
);
throw jsonRes.error;
}
return jsonRes;
}
// may throw
const solvePow = async () => {
const res = await call('GET', '/api/pow/challenge');
const worker = new Worker('/assets/solvePow.js');
const p = new Promise((resolve, reject) => {
worker.postMessage({seedHex: res.seed, target: res.target});
worker.onmessage = resolve;
});
const powSol = (await p).data;
worker.terminate();
return {seed: res.seed, solution: powSol};
}
const call = async (method, route, opts = {}) => {
const { body = {}, requiresPow = false } = opts;
const reqOpts = { method };
if (requiresPow) {
const {seed, solution} = await solvePow();
body.powSeed = seed;
body.powSolution = solution;
}
if (Object.keys(body).length > 0) {
const form = new FormData();
for (const key in body) form.append(key, body[key]);
reqOpts.body = form;
}
const req = new Request(route, reqOpts);
return doFetch(req);
}
export {
call,
}
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