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143
src/main/java/io/supertokens/webserver/RequestStats.java
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| /* | ||
| * Copyright (c) 2023, VRAI Labs and/or its affiliates. All rights reserved. | ||
| * | ||
| * This software is licensed under the Apache License, Version 2.0 (the | ||
| * "License") as published by the Apache Software Foundation. | ||
| * | ||
| * You may not use this file except in compliance with the License. You may | ||
| * obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT | ||
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the | ||
| * License for the specific language governing permissions and limitations | ||
| * under the License. | ||
| */ | ||
|
|
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| package io.supertokens.webserver; | ||
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| import com.google.gson.JsonArray; | ||
| import com.google.gson.JsonObject; | ||
| import com.google.gson.JsonPrimitive; | ||
| import io.supertokens.Main; | ||
| import io.supertokens.ResourceDistributor; | ||
| import io.supertokens.multitenancy.Multitenancy; | ||
| import io.supertokens.pluginInterface.multitenancy.AppIdentifier; | ||
| import io.supertokens.pluginInterface.multitenancy.exceptions.TenantOrAppNotFoundException; | ||
|
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| public class RequestStats extends ResourceDistributor.SingletonResource { | ||
| public static final String RESOURCE_KEY = "io.supertokens.webserver.RequestStats"; | ||
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| private final int MAX_MINUTES = 24 * 60; | ||
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| private long currentMinute; // current minute since epoch | ||
| private final int[] currentMinuteRequestCounts; // array of 60 items representing number of requests at each second in the current minute | ||
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| // The 2 arrays below contains stats for a day for every minute | ||
| // the array is stored in such a way that array[currentMinute % MAX_MINUTES] contains the stats for a day ago | ||
| // until array[(currentMinute - 1) % MAX_MINUTES] which contains the stats for the last minute, circling around | ||
| // from end of array to the beginning | ||
| // for e.g. if currentMinute % MAX_MINUTES = 250, | ||
| // then array[250] contains stats for now - 1440 minutes | ||
| // array[251] contains stats for now - 1439 minutes | ||
| // ... | ||
| // array[1439] contains stats for now - 1191 minutes | ||
| // array[0] contains stats for now - 1190 minutes | ||
| // array[1] contains stats for now - 1189 minutes | ||
| // ... | ||
| // array[249] contains stats for now - 1 minute | ||
| private final double[] averageRequestsPerSecond; | ||
| private final int[] peakRequestsPerSecond; | ||
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| private RequestStats() { | ||
| currentMinute = System.currentTimeMillis() / 60000; | ||
| currentMinuteRequestCounts = new int[60]; | ||
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| averageRequestsPerSecond = new double[MAX_MINUTES]; | ||
| peakRequestsPerSecond = new int[MAX_MINUTES]; | ||
| for (int i = 0; i < MAX_MINUTES; i++) { | ||
| averageRequestsPerSecond[i] = -1; | ||
| peakRequestsPerSecond[i] = -1; | ||
| } | ||
| } | ||
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| private void checkAndUpdateMinute(long currentSecond) { | ||
| if (currentSecond / 60 == currentMinute) { | ||
| return; // stats update not required | ||
| } | ||
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| int sum = 0; | ||
| int max = 0; | ||
| for (int i = 0; i < 60; i++) { | ||
| sum += currentMinuteRequestCounts[i]; | ||
| max = Math.max(max, currentMinuteRequestCounts[i]); | ||
| } | ||
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| averageRequestsPerSecond[(int) (currentMinute % MAX_MINUTES)] = sum / 60.0; | ||
| peakRequestsPerSecond[(int) (currentMinute % MAX_MINUTES)] = max; | ||
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| // fill zeros for passed minutes | ||
| for (long i = currentMinute + 1; i < currentSecond / 60; i++) { | ||
| averageRequestsPerSecond[(int) (i % MAX_MINUTES)] = 0; | ||
| peakRequestsPerSecond[(int) (i % MAX_MINUTES)] = 0; | ||
| } | ||
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| currentMinute = currentSecond / 60; | ||
| for (int i = 0; i < 60; i++) { | ||
| currentMinuteRequestCounts[i] = 0; | ||
| } | ||
| } | ||
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| private void updateCounts(long currentSecond) { | ||
| currentMinuteRequestCounts[(int) (currentSecond % 60)]++; | ||
| } | ||
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| public static RequestStats getInstance(Main main, AppIdentifier appIdentifier) throws TenantOrAppNotFoundException { | ||
| try { | ||
| return (RequestStats) main.getResourceDistributor() | ||
| .getResource(appIdentifier.getAsPublicTenantIdentifier(), RESOURCE_KEY); | ||
| } catch (TenantOrAppNotFoundException e) { | ||
| // appIdentifier parameter is coming from the API request and hence we need to check if the app exists | ||
| // before creating a resource for it, otherwise someone could fill up memory by making requests for apps | ||
| // that don't exist. | ||
| // The other resources are created during init or while refreshing tenants from the db, so we don't need | ||
| // this kind of pattern for those resources. | ||
| if (Multitenancy.getTenantInfo(main, appIdentifier.getAsPublicTenantIdentifier()) == null) { | ||
| throw e; | ||
| } | ||
| return (RequestStats) main.getResourceDistributor() | ||
| .setResource(appIdentifier.getAsPublicTenantIdentifier(), RESOURCE_KEY, new RequestStats()); | ||
| } | ||
| } | ||
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| public void updateRequestStats() { | ||
| this.updateRequestStats(true); | ||
| } | ||
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| synchronized private void updateRequestStats(boolean updateCounts) { | ||
| long now = System.currentTimeMillis() / 1000; | ||
| this.checkAndUpdateMinute(now); | ||
| if (updateCounts) { this.updateCounts(now); } | ||
| } | ||
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| public JsonObject getStats() { | ||
| this.updateRequestStats(false); | ||
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| JsonArray avgRps = new JsonArray(); | ||
| JsonArray peakRps = new JsonArray(); | ||
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| long atMinute = System.currentTimeMillis() / 60000; | ||
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| int offset = (int) (atMinute % MAX_MINUTES); | ||
| for (int i = 0; i < MAX_MINUTES; i++) { | ||
| avgRps.add(new JsonPrimitive(this.averageRequestsPerSecond[(i + offset) % MAX_MINUTES])); | ||
| peakRps.add(new JsonPrimitive(this.peakRequestsPerSecond[(i + offset) % MAX_MINUTES])); | ||
| } | ||
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| JsonObject result = new JsonObject(); | ||
| result.addProperty("atMinute", atMinute); | ||
| result.add("averageRequestsPerSecond", avgRps); | ||
| result.add("peakRequestsPerSecond", peakRps); | ||
| return result; | ||
| } | ||
| } |
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