mirror of
https://github.com/element-hq/element-web.git
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65 lines
2.2 KiB
JavaScript
65 lines
2.2 KiB
JavaScript
/*
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Copyright 2018 New Vector Ltd
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import SdkConfig from './SdkConfig';
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function hashCode(str) {
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let hash = 0;
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let i;
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let chr;
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if (str.length === 0) {
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return hash;
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}
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for (i = 0; i < str.length; i++) {
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chr = str.charCodeAt(i);
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hash = ((hash << 5) - hash) + chr;
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hash |= 0;
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}
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return Math.abs(hash);
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}
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export function phasedRollOutExpiredForUser(username, feature, now, rollOutConfig = SdkConfig.get().phasedRollOut) {
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if (!rollOutConfig) {
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console.log(`no phased rollout configuration, so enabling ${feature}`);
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return true;
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}
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const featureConfig = rollOutConfig[feature];
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if (!featureConfig) {
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console.log(`${feature} doesn't have phased rollout configured, so enabling`);
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return true;
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}
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if (!Number.isFinite(featureConfig.offset) || !Number.isFinite(featureConfig.period)) {
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console.error(`phased rollout of ${feature} is misconfigured, ` +
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`offset and/or period are not numbers, so disabling`, featureConfig);
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return false;
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}
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const hash = hashCode(username);
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//ms -> min, enable users at minute granularity
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const bucketRatio = 1000 * 60;
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const bucketCount = featureConfig.period / bucketRatio;
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const userBucket = hash % bucketCount;
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const userMs = userBucket * bucketRatio;
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const enableAt = featureConfig.offset + userMs;
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const result = now >= enableAt;
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const bucketStr = `(bucket ${userBucket}/${bucketCount})`;
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if (result) {
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console.log(`${feature} enabled for ${username} ${bucketStr}`);
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} else {
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console.log(`${feature} will be enabled for ${username} in ${Math.ceil((enableAt - now)/1000)}s ${bucketStr}`);
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}
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return result;
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}
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