@splitsoftware/splitio-commons
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Split JavaScript SDK common components
65 lines (64 loc) • 3.3 kB
JavaScript
import { FLAG_SPEC_VERSION } from '../../../utils/constants';
import { base } from '../../../utils/settingsValidation';
import { LOG_PREFIX_SYNC_SPLITS } from '../../../logger/constants';
var PROXY_CHECK_INTERVAL_MILLIS_CS = 60 * 60 * 1000; // 1 hour in Client Side
var PROXY_CHECK_INTERVAL_MILLIS_SS = 24 * PROXY_CHECK_INTERVAL_MILLIS_CS; // 24 hours in Server Side
function sdkEndpointOverridden(settings) {
return settings.urls.sdk !== base.urls.sdk;
}
/**
* Factory of SplitChanges fetcher.
* SplitChanges fetcher is a wrapper around `splitChanges` API service that parses the response and handle errors.
*/
// @TODO breaking: drop support for Split Proxy below v5.10.0 and simplify the implementation
export function splitChangesFetcherFactory(fetchSplitChanges, settings, storage) {
var log = settings.log;
var PROXY_CHECK_INTERVAL_MILLIS = settings.core.key !== undefined ? PROXY_CHECK_INTERVAL_MILLIS_CS : PROXY_CHECK_INTERVAL_MILLIS_SS;
var lastProxyCheckTimestamp;
return function splitChangesFetcher(since, noCache, till, rbSince,
// Optional decorator for `fetchSplitChanges` promise, such as timeout or time tracker
decorator) {
// Recheck proxy
if (lastProxyCheckTimestamp && (Date.now() - lastProxyCheckTimestamp) > PROXY_CHECK_INTERVAL_MILLIS) {
settings.sync.flagSpecVersion = FLAG_SPEC_VERSION;
}
var splitsPromise = fetchSplitChanges(since, noCache, till, settings.sync.flagSpecVersion === FLAG_SPEC_VERSION ? rbSince : undefined)
.catch(function (err) {
// Handle proxy error with spec 1.3
if ((!err.statusCode || err.statusCode === 400) && sdkEndpointOverridden(settings) && settings.sync.flagSpecVersion === FLAG_SPEC_VERSION) {
log.error(LOG_PREFIX_SYNC_SPLITS + 'Proxy error detected. Retrying with spec 1.2. If you are using Split Proxy, please upgrade to latest version');
lastProxyCheckTimestamp = Date.now();
settings.sync.flagSpecVersion = '1.2'; // fallback to 1.2 spec
return fetchSplitChanges(since, noCache, till); // retry request without rbSince
}
throw err;
});
if (decorator)
splitsPromise = decorator(splitsPromise);
return splitsPromise
.then(function (resp) { return resp.json(); })
.then(function (data) {
// Using flag spec version 1.2 or below
if (data.splits) {
return {
ff: {
d: data.splits,
s: data.since,
t: data.till
}
};
}
// Proxy recovery
if (lastProxyCheckTimestamp) {
log.info(LOG_PREFIX_SYNC_SPLITS + 'Proxy error recovered');
lastProxyCheckTimestamp = undefined;
return splitChangesFetcher(-1, undefined, undefined, -1)
.then(function (splitChangesResponse) {
return Promise.all([storage.splits.clear(), storage.rbSegments.clear()])
.then(function () { return splitChangesResponse; });
});
}
return data;
});
};
}