Show total stats if not under high load

src/config.ts

@@ -78,7 +78,8 @@ addDefaults(config, {
         idleTimeoutMillis: 10000,
         maxTries: 3,
         maxActiveRequests: 0,
-        timeout: 60000
+        timeout: 60000,
+        highLoadThreshold: 10
     },
     postgresReadOnly: {
         enabled: false,

src/databases/IDatabase.ts

@@ -7,6 +7,8 @@ export interface IDatabase {
     init(): Promise<void>;
 
     prepare(type: QueryType, query: string, params?: any[], options?: QueryOption): Promise<any | any[] | void>;
+
+    highLoad(): boolean;
 }
 
 export type QueryType = "get" | "all" | "run";

src/databases/Mysql.ts

@@ -32,4 +32,8 @@ export class Mysql implements IDatabase {
         }
     }
 
+    highLoad() {
+        return false;
+    }
+
 }

src/databases/Postgres.ts

@@ -235,4 +235,8 @@ export class Postgres implements IDatabase {
 
         return result;
     }
+
+    highLoad() {
+        return this.activePostgresRequests > this.config.postgres.highLoadThreshold;
+    }
 }

src/databases/Sqlite.ts

@@ -95,6 +95,10 @@ export class Sqlite implements IDatabase {
     private static processUpgradeQuery(query: string): string {
         return query.replace(/^.*--!sqlite-ignore/gm, "");
     }
+
+    highLoad() {
+        return false;
+    }
 }
 
 export interface SqliteConfig {

src/routes/getTotalStats.ts

@@ -12,13 +12,26 @@ let firefoxUsersCache = 0;
 let apiUsersCache = 0;
 let lastUserCountCheck = 0;
 
+interface DBStatsData {
+    userCount: number,
+    viewCount: number,
+    totalSubmissions: number,
+    minutesSaved: number
+}
+
+let lastFetch: DBStatsData = {
+    userCount: 0,
+    viewCount: 0,
+    totalSubmissions: 0,
+    minutesSaved: 0
+};
+
 updateExtensionUsers();
 
 export async function getTotalStats(req: Request, res: Response): Promise<void> {
-    const userCountQuery = `(SELECT COUNT(*) FROM (SELECT DISTINCT "userID" from "sponsorTimes") t) "userCount",`;
 
-    const row = await db.prepare("get", `SELECT ${req.query.countContributingUsers ? userCountQuery : ""} COUNT(*) as "totalSubmissions",
-        SUM("views") as "viewCount", SUM(("endTime" - "startTime") / 60 * "views") as "minutesSaved" FROM "sponsorTimes" WHERE "shadowHidden" != 1 AND "votes" >= 0 AND "actionType" != 'chapter'`, []);
+    const row = await getStats(!!req.query.countContributingUsers);
+    lastFetch = row;
 
     if (row !== undefined) {
         const extensionUsers = chromeUsersCache + firefoxUsersCache;
@@ -43,6 +56,18 @@ export async function getTotalStats(req: Request, res: Response): Promise<void>
     }
 }
 
+function getStats(countContributingUsers: boolean): Promise<DBStatsData> {
+    if (db.highLoad()) {
+        return Promise.resolve(lastFetch);
+    } else {
+        const userCountQuery = `(SELECT COUNT(*) FROM (SELECT DISTINCT "userID" from "sponsorTimes") t) "userCount",`;
+
+        return db.prepare("get", `SELECT ${countContributingUsers ? userCountQuery : ""} COUNT(*) as "totalSubmissions",
+            SUM("views") as "viewCount", SUM(("endTime" - "startTime") / 60 * "views") as "minutesSaved" FROM "sponsorTimes" WHERE "shadowHidden" != 1 AND "votes" >= 0 AND "actionType" != 'chapter'`, []);
+    }
+}
+
+
 function updateExtensionUsers() {
     if (config.userCounterURL) {
         axios.get(`${config.userCounterURL}/api/v1/userCount`)
@@ -68,7 +93,7 @@ function updateExtensionUsers() {
                     const userDownloadsStartIndex = body.indexOf(matchingString);
                     if (userDownloadsStartIndex >= 0) {
                         const closingQuoteIndex = body.indexOf('"', userDownloadsStartIndex + matchingStringLen);
-                        const userDownloadsStr = body.substr(userDownloadsStartIndex + matchingStringLen, closingQuoteIndex - userDownloadsStartIndex).replace(",","").replace(".","");
+                        const userDownloadsStr = body.substr(userDownloadsStartIndex + matchingStringLen, closingQuoteIndex - userDownloadsStartIndex).replace(",", "").replace(".", "");
                         chromeUsersCache = parseInt(userDownloadsStr);
                     }
                     else {

src/types/config.model.ts

@@ -25,6 +25,7 @@ export interface CustomPostgresConfig extends PoolConfig {
 export interface CustomWritePostgresConfig extends CustomPostgresConfig {
     maxActiveRequests: number;
     timeout: number;
+    highLoadThreshold: number;
 }
 
 export interface CustomPostgresReadOnlyConfig extends CustomPostgresConfig {