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const STORE_URL =
'/connection-allowlist/tentative/resources/key-value-store.py';
// URL with this query is exempted from connection allowlist.
const IGNORE_ALLOWLIST = 'ignore-allowlist=true';
// Reads the value specified by `key` from the key-value store on the server.
async function readValueFromServer(key) {
const serverUrl = `${STORE_URL}?${IGNORE_ALLOWLIST}&key=${key}`;
const response = await fetch(serverUrl);
if (!response.ok)
throw new Error('An error happened in the server');
const value = await response.text();
// The value is not stored in the server.
if (value === '')
return {status: false};
return {status: true, value: value};
}
// Convenience wrapper around the above getter that will wait until a value is
// available on the server.
async function nextValueFromServer(key) {
// Resolve the key if it is a Promise.
key = await key;
while (true) {
// Fetches the test result from the server.
const {status, value} = await readValueFromServer(key);
if (!status) {
// The test result has not been stored yet. Retry after a while.
await new Promise(resolve => step_timeout(resolve, 100));
continue;
}
return value;
}
}