feat: rewrite frontpage code with direct db queries

src/backend/database/pg-wrapper.js

@@ -302,41 +302,11 @@ export async function pgInitializeHistories() {
   }
 }
 
-async function pgInitializeFrontpage() {
-  let buildFrontpage = () =>
-    `CREATE TABLE latest.frontpage (
-	  id serial primary key,
-    frontpage_sliced jsonb,
-    frontpage_full jsonb
-	);`;
-  let YOLO = false;
-  if (YOLO) {
-    console.log("Create frontpage table and its index");
-
-    await runPgCommand({
-      command: dropTable("latest", "frontpage"),
-      pool: readWritePool,
-    });
-
-    await runPgCommand({
-      command: buildFrontpage(),
-      pool: readWritePool,
-    });
-
-    console.log("");
-  } else {
-    console.log(
-      "pgInitializeFrontpage: This command is dangerous, set YOLO to true in the code to invoke it"
-    );
-  }
-}
-
 export async function pgInitialize() {
   await pgInitializeScaffolding();
   await pgInitializeLatest();
   await pgInitializeHistories();
   await pgInitializeDashboards();
-  await pgInitializeFrontpage();
 }
 
 // Read

src/backend/frontpage.ts

@@ -2,20 +2,23 @@ import { pgRead, readWritePool } from './database/pg-wrapper';
 
 export async function getFrontpageRaw() {
   const client = await readWritePool.connect();
-  const res = await client.query(
+  const res = await client.query(`
-    "SELECT frontpage_sliced FROM latest.frontpage ORDER BY id DESC LIMIT 1"
+    SELECT * FROM latest.combined
-  );
+    WHERE
+      (qualityindicators->>'stars')::int >= 3
+      AND description != ''
+      AND JSON_ARRAY_LENGTH(options) > 0
+    ORDER BY RANDOM() LIMIT 50
+  `);
   if (!res.rows.length) return [];
   return res.rows[0].frontpage_sliced;
 }
 
 export async function getFrontpageFullRaw() {
-  const client = await readWritePool.connect();
+  return await pgRead({
-  const res = await client.query(
+    schema: "latest",
-    "SELECT frontpage_full FROM latest.frontpage ORDER BY id DESC LIMIT 1"
+    tableName: "combined",
-  );
+  });
-  if (!res.rows.length) return [];
-  return res.rows[0].frontpage_full;
 }
 
 export async function getFrontpage() {
@@ -33,57 +36,3 @@ export async function getFrontpage() {
     return frontPageForecastsCompatibleWithFuse;
   }
 }
-
-// Helpers
-let shuffle = (array) => {
-  // https://stackoverflow.com/questions/2450954/how-to-randomize-shuffle-a-javascript-array
-  let currentIndex = array.length,
-    randomIndex;
-
-  // While there remain elements to shuffle...
-  while (currentIndex != 0) {
-    // Pick a remaining element...
-    randomIndex = Math.floor(Math.random() * currentIndex);
-    currentIndex--;
-
-    // And swap it with the current element.
-    [array[currentIndex], array[randomIndex]] = [
-      array[randomIndex],
-      array[currentIndex],
-    ];
-  }
-
-  return array;
-};
-
-// Main
-export async function downloadFrontpage() {
-  let init = Date.now();
-
-  const frontpageFull = await pgRead({
-    schema: "latest",
-    tableName: "combined",
-  });
-
-  let frontpageFiltered = frontpageFull.filter(
-    (forecast) =>
-      forecast.qualityindicators &&
-      forecast.qualityindicators.stars >= 3 &&
-      forecast.options &&
-      forecast.options.length > 0 &&
-      forecast.description != ""
-  );
-  let frontpageSliced = shuffle(frontpageFiltered).slice(0, 50);
-
-  const client = await readWritePool.connect();
-  await client.query(
-    "INSERT INTO latest.frontpage(frontpage_full, frontpage_sliced) VALUES($1, $2)",
-    [JSON.stringify(frontpageFull), JSON.stringify(frontpageSliced)]
-  );
-
-  let end = Date.now();
-  let difference = end - init;
-  console.log(
-    `Took ${difference / 1000} seconds, or ${difference / (1000 * 60)} minutes.`
-  );
-}

src/pages/api/cron/update-frontpage.ts

@@ -1,16 +0,0 @@
-import { NextApiRequest, NextApiResponse } from 'next/types';
-
-import { downloadFrontpage } from '../../../backend/frontpage';
-
-export default async function handler(
-  req: NextApiRequest,
-  res: NextApiResponse
-) {
-  // TODO - check auth token
-  if (req.method !== "POST") {
-    res.status(400).send("Expected POST method");
-    return;
-  }
-  await downloadFrontpage();
-  res.status(200).send("Updated");
-}