50 lines
1.7 KiB
JavaScript
50 lines
1.7 KiB
JavaScript
function createProgressiveLiveSnapshot({fetchSnapshot}) {
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let value = null;
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let flight = null;
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const hasIdentity = snapshot => {
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const user = snapshot?.context?.user || {};
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return Boolean(String(user.login || '').trim());
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};
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const requireUsable = (snapshot, options) => {
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if (!options?.requireIdentity || hasIdentity(snapshot)) return snapshot;
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if (value === snapshot) value = null;
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throw new Error('Authenticated account identity is unavailable.');
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};
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const acquire = (options = {}) => {
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if (value) return Promise.resolve().then(() => requireUsable(value, options));
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if (flight) return flight.then(snapshot => requireUsable(snapshot, options));
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flight = Promise.resolve().then(() => fetchSnapshot()).then(snapshot => {
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value = snapshot;
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flight = null;
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return snapshot;
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}, error => {
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flight = null;
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throw error;
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});
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return flight.then(snapshot => requireUsable(snapshot, options));
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};
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return {
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acquire,
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snapshot:() => value,
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pending:() => flight,
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identity() {
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const user = value?.context?.user || {};
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const login = String(user.login || '').trim();
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return {login, accountKey:login && user.id ? String(user.id) + ':' + login : login};
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},
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};
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}
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if (typeof window !== 'undefined') {
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window.stackchainProgressiveLiveSnapshot = createProgressiveLiveSnapshot({
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fetchSnapshot:async () => {
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const response = await fetch('api/v1/live', {headers:{Accept:'application/json'}});
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if (!response.ok) throw new Error('HTTP ' + response.status);
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return response.json();
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},
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});
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}
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if (typeof module !== 'undefined' && module.exports) module.exports = createProgressiveLiveSnapshot;
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