chore: extract duplicated font listing

Signed-off-by: Martin d'Allens <martin.dallens@liberty-rider.com>

package.json

@@ -14,7 +14,7 @@
     "lint:eslint:fix": "eslint --fix \"{,!(node_modules|dist|static|public)/**/}*.{js,ts,cjs,mjs}\" --ignore-path .gitignore",
     "lint:prettier": "prettier --check \"{,!(node_modules|dist|static|public)/**/}*.{js,ts,cjs,mjs,json}\" --ignore-path .gitignore",
     "lint:prettier:fix": "prettier --write \"{,!(node_modules|dist|static|public)/**/}*.{js,ts,cjs,mjs,json}\" --ignore-path .gitignore",
-    "docker": "docker build -f Dockerfile . && docker run --rm -i -p 8080:8080 $(docker build -q .)",
+    "docker": "docker build . && docker run --rm -i -p 8080:8080 $(docker build -q .)",
     "prepare": "node -e \"if (process.env.NODE_ENV !== 'production'){ process.exit(1) } \" || husky install"
   },
   "dependencies": {

src/serve_font.js

@@ -1,10 +1,8 @@
 'use strict';
 
 import express from 'express';
-import fs from 'node:fs';
-import path from 'path';
 
-import { getFontsPbf } from './utils.js';
+import { getFontsPbf, listFonts } from './utils.js';
 
 export const serve_font = (options, allowedFonts) => {
   const app = express().disable('x-powered-by');
@@ -14,29 +12,6 @@ export const serve_font = (options, allowedFonts) => {
   const fontPath = options.paths.fonts;
 
   const existingFonts = {};
-  const fontListingPromise = new Promise((resolve, reject) => {
-    fs.readdir(options.paths.fonts, (err, files) => {
-      if (err) {
-        reject(err);
-        return;
-      }
-      for (const file of files) {
-        fs.stat(path.join(fontPath, file), (err, stats) => {
-          if (err) {
-            reject(err);
-            return;
-          }
-          if (
-            stats.isDirectory() &&
-            fs.existsSync(path.join(fontPath, file, '0-255.pbf'))
-          ) {
-            existingFonts[path.basename(file)] = true;
-          }
-        });
-      }
-      resolve();
-    });
-  });
 
   app.get('/fonts/:fontstack/:range([\\d]+-[\\d]+).pbf', (req, res, next) => {
     const fontstack = decodeURI(req.params.fontstack);
@@ -65,5 +40,8 @@ export const serve_font = (options, allowedFonts) => {
     );
   });
 
-  return fontListingPromise.then(() => app);
+  return listFonts(options.paths.fonts).then((fonts) => {
+    Object.assign(existingFonts, fonts);
+    return app;
+  });
 };

src/serve_rendered.js

@@ -20,6 +20,7 @@ import proj4 from 'proj4';
 import axios from 'axios';
 import {
   getFontsPbf,
+  listFonts,
   getTileUrls,
   isValidHttpUrl,
   fixTileJSONCenter,
@@ -613,27 +614,6 @@ let maxScaleFactor = 2;
 
 export const serve_rendered = {
   init: (options, repo) => {
-    const fontListingPromise = new Promise((resolve, reject) => {
-      fs.readdir(options.paths.fonts, (err, files) => {
-        if (err) {
-          reject(err);
-          return;
-        }
-        for (const file of files) {
-          fs.stat(path.join(options.paths.fonts, file), (err, stats) => {
-            if (err) {
-              reject(err);
-              return;
-            }
-            if (stats.isDirectory()) {
-              existingFonts[path.basename(file)] = true;
-            }
-          });
-        }
-        resolve();
-      });
-    });
-
     maxScaleFactor = Math.min(Math.floor(options.maxScaleFactor || 3), 9);
     let scalePattern = '';
     for (let i = 2; i <= maxScaleFactor; i++) {
@@ -1215,7 +1195,10 @@ export const serve_rendered = {
       return res.send(info);
     });
 
-    return Promise.all([fontListingPromise]).then(() => app);
+    return listFonts(options.paths.fonts).then((fonts) => {
+      Object.assign(existingFonts, fonts);
+      return app;
+    });
   },
   add: async (options, repo, params, id, publicUrl, dataResolver) => {
     const map = {
@@ -1618,7 +1601,7 @@ export const serve_rendered = {
       }
     });
 
-    return Promise.all([renderersReadyPromise]);
+    return renderersReadyPromise;
   },
   remove: (repo, id) => {
     const item = repo[id];

src/utils.js

@@ -163,6 +163,35 @@ export const getFontsPbf = (
   return Promise.all(queue).then((values) => glyphCompose.combine(values));
 };
 
+export const listFonts = async (fontPath) => {
+  const existingFonts = {};
+  const fontListingPromise = new Promise((resolve, reject) => {
+    fs.readdir(fontPath, (err, files) => {
+      if (err) {
+        reject(err);
+        return;
+      }
+      for (const file of files) {
+        fs.stat(path.join(fontPath, file), (err, stats) => {
+          if (err) {
+            reject(err);
+            return;
+          }
+          if (
+            stats.isDirectory() &&
+            fs.existsSync(path.join(fontPath, file, '0-255.pbf'))
+          ) {
+            existingFonts[path.basename(file)] = true;
+          }
+        });
+      }
+      resolve();
+    });
+  });
+  await fontListingPromise;
+  return existingFonts;
+};
+
 export const isValidHttpUrl = (string) => {
   let url;