style(wind): adopt automatically discovered runtime formatting

server/providers/wind.js

@@ -3,14 +3,33 @@ import { fetchIfsWind } from './wind/ifs.js';
 import { decodeWindGribMessage } from './wind/decode.js';
 
 /** Serve bounded, single-flight, per-model forecast snapshots from fixed providers. */
-export function windProxy({ fetchImpl = fetch, now = () => Date.now(), decodeImpl = decodeWindGribMessage, targetDx = 1, ttlMs = 3600_000, timeoutMs = 40_000, models = { gfs: fetchGfsWind, ifs: fetchIfsWind } } = {}) {
+export function windProxy({
+  fetchImpl = fetch,
+  now = () => Date.now(),
+  decodeImpl = decodeWindGribMessage,
+  targetDx = 1,
+  ttlMs = 3600_000,
+  timeoutMs = 40_000,
+  models = { gfs: fetchGfsWind, ifs: fetchIfsWind },
+} = {}) {
   const caches = new Map();
   const loadings = new Map();
   const grids = new Map();
   const attempts = new Map();
-  const unavailable = (model) => ({ manifest: { model, schemaVersion: 1, unavailable: true, stale: true, reason: 'Wind upstream unavailable' } });
+  const unavailable = (model) => ({
+    manifest: {
+      model,
+      schemaVersion: 1,
+      unavailable: true,
+      stale: true,
+      reason: 'Wind upstream unavailable',
+    },
+  });
   const sendJson = (res, value, status = 200) => {
-    res.writeHead(status, { 'Content-Type': 'application/json', 'Cache-Control': 'no-store' });
+    res.writeHead(status, {
+      'Content-Type': 'application/json',
+      'Cache-Control': 'no-store',
+    });
     res.end(JSON.stringify(value));
   };
   function refresh(model) {
@@ -21,15 +40,36 @@ export function windProxy({ fetchImpl = fetch, now = () => Date.now(), decodeImp
     operation.promise = (async () => {
       const timer = setTimeout(() => controller.abort(), timeoutMs);
       try {
-        const value = await models[model]({ fetchImpl, now, decodeImpl, targetDx, signal: controller.signal });
+        const value = await models[model]({
+          fetchImpl,
+          now,
+          decodeImpl,
+          targetDx,
+          signal: controller.signal,
+        });
         controller.signal.throwIfAborted();
         const { grid, cycle } = value;
-        if (!grid.u.every(Number.isFinite) || !grid.v.every(Number.isFinite)) throw new Error('Invalid wind grid');
+        if (!grid.u.every(Number.isFinite) || !grid.v.every(Number.isFinite))
+          throw new Error('Invalid wind grid');
         const id = `${model}-${cycle.date}-${cycle.hour}-f${cycle.forecastHour || 0}-${targetDx}`;
         const manifest = {
-          schemaVersion: 1, model, cycle, fetchedAt: now(), level: value.level, units: value.units,
-          grid: { nx: grid.nx, ny: grid.ny, lo1: grid.lo1, la1: grid.la1, dx: grid.dx, dy: grid.dy },
-          stale: false, unavailable: false, reason: null,
+          schemaVersion: 1,
+          model,
+          cycle,
+          fetchedAt: now(),
+          level: value.level,
+          units: value.units,
+          grid: {
+            nx: grid.nx,
+            ny: grid.ny,
+            lo1: grid.lo1,
+            la1: grid.la1,
+            dx: grid.dx,
+            dy: grid.dy,
+          },
+          stale: false,
+          unavailable: false,
+          reason: null,
           gridUrl: `/api/wind/grid/${id}.bin?model=${model}`,
         };
         const state = { id, grid, manifest, fetchedAt: now() };
@@ -47,7 +87,11 @@ export function windProxy({ fetchImpl = fetch, now = () => Date.now(), decodeImp
         }
         const old = caches.get(model);
         if (old) {
-          old.manifest = { ...old.manifest, stale: true, reason: 'Wind upstream unavailable' };
+          old.manifest = {
+            ...old.manifest,
+            stale: true,
+            reason: 'Wind upstream unavailable',
+          };
           return old;
         }
         return unavailable(model);
@@ -62,38 +106,71 @@ export function windProxy({ fetchImpl = fetch, now = () => Date.now(), decodeImp
   const handler = async (req, res) => {
     const url = new URL(req.url, 'http://localhost');
     const model = url.searchParams.get('model') || 'gfs';
-    if (req.method !== 'GET') return sendJson(res, { error: 'method_not_allowed' }, 405);
-    if (!['gfs', 'ifs'].includes(model) || !Object.hasOwn(models, model)) return sendJson(res, { error: 'unknown_model' }, 400);
+    if (req.method !== 'GET')
+      return sendJson(res, { error: 'method_not_allowed' }, 405);
+    if (!['gfs', 'ifs'].includes(model) || !Object.hasOwn(models, model))
+      return sendJson(res, { error: 'unknown_model' }, 400);
     if (url.pathname.startsWith('/grid/')) {
       const id = url.pathname.slice(6).replace(/\.bin$/, '');
-      const state = url.pathname === `/grid/${id}.bin` && grids.get(model)?.get(id);
+      const state =
+        url.pathname === `/grid/${id}.bin` && grids.get(model)?.get(id);
       if (!state) return sendJson(res, { error: 'unknown_grid' }, 404);
-      const bytes = Buffer.concat([Buffer.from(state.grid.u.buffer, state.grid.u.byteOffset, state.grid.u.byteLength), Buffer.from(state.grid.v.buffer, state.grid.v.byteOffset, state.grid.v.byteLength)]);
-      res.writeHead(200, { 'Content-Type': 'application/octet-stream', 'Cache-Control': 'public, max-age=3600, immutable' });
+      const bytes = Buffer.concat([
+        Buffer.from(
+          state.grid.u.buffer,
+          state.grid.u.byteOffset,
+          state.grid.u.byteLength,
+        ),
+        Buffer.from(
+          state.grid.v.buffer,
+          state.grid.v.byteOffset,
+          state.grid.v.byteLength,
+        ),
+      ]);
+      res.writeHead(200, {
+        'Content-Type': 'application/octet-stream',
+        'Cache-Control': 'public, max-age=3600, immutable',
+      });
       return res.end(bytes);
     }
-    if (!['/', '/manifest', '/status'].includes(url.pathname)) return sendJson(res, { error: 'not_found' }, 404);
+    if (!['/', '/manifest', '/status'].includes(url.pathname))
+      return sendJson(res, { error: 'not_found' }, 404);
     let state = caches.get(model);
     if (!state || now() - state.fetchedAt >= ttlMs) {
       let operation = loadings.get(model);
-      if (!operation && now() - (attempts.get(model) ?? -Infinity) >= 60_000) operation = refresh(model);
+      if (!operation && now() - (attempts.get(model) ?? -Infinity) >= 60_000)
+        operation = refresh(model);
       if (operation) {
         let disconnected = false;
         operation.waiters += 1;
-        const close = () => { disconnected = true; if (--operation.waiters === 0) operation.controller.abort(); };
+        const close = () => {
+          disconnected = true;
+          if (--operation.waiters === 0) operation.controller.abort();
+        };
         res.once?.('close', close);
-        try { state = await operation.promise; }
-        finally { res.removeListener?.('close', close); if (!disconnected) operation.waiters -= 1; }
+        try {
+          state = await operation.promise;
+        } finally {
+          res.removeListener?.('close', close);
+          if (!disconnected) operation.waiters -= 1;
+        }
         if (disconnected) return;
       }
     }
     const manifest = state?.manifest || unavailable(model).manifest;
-    if (url.pathname === '/status') { const { gridUrl, ...status } = manifest; return sendJson(res, status); }
+    if (url.pathname === '/status') {
+      const { gridUrl, ...status } = manifest;
+      return sendJson(res, status);
+    }
     return sendJson(res, manifest);
   };
   return {
     name: 'wind',
-    configureServer({ middlewares }) { middlewares.use('/api/wind', handler); },
-    configurePreviewServer({ middlewares }) { middlewares.use('/api/wind', handler); },
+    configureServer({ middlewares }) {
+      middlewares.use('/api/wind', handler);
+    },
+    configurePreviewServer({ middlewares }) {
+      middlewares.use('/api/wind', handler);
+    },
   };
 }