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import { FetchError, ErrorCode } from "./exceptions.js";
/**
* @param {Response} response
* @returns
*/
export const getText = (response) => response.text();
/**
* This is a fetch wrapper that handles any non 200 responses and throws a
* FetchError with the right ErrorCode. This is useful because our FetchError
* will automatically create an alert banner.
*
* @param {string} url - URL to fetch
* @param {Request} [options] - options to pass to fetch
* @returns {Promise<Response>}
*/
export async function robustFetch(url, options) {
let response;
// Note: We need to wrap fetch into a try/catch block because fetch
// throws a TypeError if the URL is invalid such as http://blah.blah
try {
response = await fetch(url, options);
} catch (err) {
const error = err;
let errMsg;
if (url.startsWith("http")) {
errMsg =
`Fetching from URL ${url} failed with error ` +
`'${error.message}'. Are your filename and path correct?`;
} else {
errMsg = `Polyscript: Access to local files
(using [[fetch]] configurations in <py-config>)
is not available when directly opening a HTML file;
you must use a webserver to serve the additional files.
See <a style="text-decoration: underline;" href="https://github.com/pyscript/pyscript/issues/257#issuecomment-1119595062">this reference</a>
on starting a simple webserver with Python.
`;
}
throw new FetchError(ErrorCode.FETCH_ERROR, errMsg);
}
// Note that response.ok is true for 200-299 responses
if (!response.ok) {
const errorMsg = `Fetching from URL ${url} failed with error ${response.status} (${response.statusText}). Are your filename and path correct?`;
switch (response.status) {
case 404:
throw new FetchError(ErrorCode.FETCH_NOT_FOUND_ERROR, errorMsg);
case 401:
throw new FetchError(
ErrorCode.FETCH_UNAUTHORIZED_ERROR,
errorMsg,
);
case 403:
throw new FetchError(ErrorCode.FETCH_FORBIDDEN_ERROR, errorMsg);
case 500:
throw new FetchError(ErrorCode.FETCH_SERVER_ERROR, errorMsg);
case 503:
throw new FetchError(
ErrorCode.FETCH_UNAVAILABLE_ERROR,
errorMsg,
);
default:
throw new FetchError(ErrorCode.FETCH_ERROR, errorMsg);
}
}
return response;
}
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