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export class AjaxError extends Error {
constructor(status, statusText) {
let message = `${status}: ${statusText}`
super(message);
this.name = this.constructor.name;
this.message = message;
this.status = status;
this.statusText = statusText;
Error.captureStackTrace(this, this.constructor.name)
}
}
function applyOptions(xhr, options) {
options.headers = options.headers || [];
for (let header in options.headers) {
xhr.setRequestHeader(header, options.headers[header]);
}
}
function createHandler(xhr, success, fail) {
return () => {
if (xhr.readyState !== XMLHttpRequest.DONE) {
return;
}
if (xhr.status === 200) {
success(xhr.response);
} else {
fail(xhr.status, xhr.statusText);
}
};
}
function request(method, url, body, options) {
options = options || {};
return new Promise((resolve, reject) => {
let xhr = new XMLHttpRequest();
xhr.onreadystatechange = createHandler(
xhr,
(res) => {
resolve(res);
},
(status, statusText) => {
reject(new AjaxError(status, statusText));
});
xhr.open(method, url, true);
applyOptions(xhr, options);
xhr.onerror = function() {
reject(new AjaxError(-1, 'Network error'));
};
xhr.send(body);
});
}
export async function get(url, options) {
return request('GET', url, null, options);
}
export async function post(url, body, options) {
return request('POST', url, body, options);
}
export async function del(url, body, options) {
return request('DELETE', url, body, options);
}
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