Add /api/allWakaValues

Just a little experiment to see this working in prod! I don't have permission to actually use this data yet, or a UI for it, just mostly want to see it hooked up to the Sheets API correctly and check the prod cache behavior.

api/allWakaValues.js

@@ -0,0 +1,58 @@
+const beeline = require("honeycomb-beeline")({
+  writeKey: process.env["HONEYCOMB_WRITE_KEY"],
+  dataset:
+    process.env["NODE_ENV"] === "production"
+      ? "Dress to Impress (2020)"
+      : "Dress to Impress (2020, dev)",
+  serviceName: "impress-2020-gql-server",
+});
+
+import fetch from "node-fetch";
+
+async function handle(req, res) {
+  let itemValues;
+  try {
+    itemValues = await loadWakaValues();
+  } catch (e) {
+    console.error(e);
+    res.setHeader("Content-Type", "text/plain");
+    res.status(500).send("Error loading Waka data from Google Sheets API");
+    return;
+  }
+
+  // Cache for 1 minute, and immediately serve stale data for a day after.
+  // This should keep it fast and responsive, and stay well within our API key
+  // limits. (This will cause the client to send more requests than necessary,
+  // but the CDN cache should generally respond quickly with a small 304 Not
+  // Modified, unless the data really did change.)
+  res.setHeader(
+    "Cache-Control",
+    "public, max-age=3600, stale-while-revalidate=86400"
+  );
+  return res.send(itemValues);
+}
+
+async function loadWakaValues() {
+  const wakaJson = await fetch(
+    `https://sheets.googleapis.com/v4/spreadsheets/` +
+      `1DRMrniTSZP0sgZK6OAFFYqpmbT6xY_Ve_i480zghOX0/values/NC%20Values` +
+      `?fields=values&key=${encodeURIComponent(process.env["GOOGLE_API_KEY"])}`
+  ).then((res) => res.json());
+
+  // Get the rows from the JSON response - skipping the first-row headers.
+  const rows = wakaJson.values.slice(1);
+
+  // Reformat the rows as a map from item name to value. We offer the item data
+  // as an object with a single field `value` for extensibility, but we omit
+  // the spreadsheet columns that we don't use on DTI, like Notes.
+  const itemValues = {};
+  for (const [itemName, value] of rows) {
+    itemValues[itemName] = { value };
+  }
+
+  return itemValues;
+}
+
+export default async (req, res) => {
+  beeline.withTrace({ name: "allWakaValues" }, () => handle(req, res));
+};