refactor: separate map feature queries and source records

src/services/application.js

@@ -1,3 +1,5 @@
+import { createOverpassFeatureSource } from '../sources/overpassFeatures.js';
+import { FEATURE_SOURCE_METHODS } from '../sources/featureSource.js';
 import { createSourceSlot } from '../sources/sourceSlot.js';
 import { createApplicationRequestServices } from './requests.js';
 
@@ -15,6 +17,11 @@ const slots = Object.fromEntries(
     createSourceSlot(defaults[name], methods, `${name} service`),
   ]),
 );
+slots.features = createSourceSlot(
+  createOverpassFeatureSource({ boundarySource: slots.boundaries.source }),
+  FEATURE_SOURCE_METHODS,
+  'features service',
+);
 export const applicationServices = Object.freeze(
   Object.fromEntries(
     Object.entries(slots).map(([name, slot]) => [name, slot.source]),

src/services/requests.js

@@ -1,3 +1,4 @@
+import { createOverpassFeatureSource } from '../sources/overpassFeatures.js';
 /** Parse bounded retry information from a service response. */
 function retryAfterMs(value) {
   if (value == null || String(value).trim() === '') return null;
@@ -13,6 +14,7 @@ export function createApplicationRequestServices({
   fetchImpl = (...args) => fetch(...args),
   signal: lifetime,
   endpoints = {},
+  features,
 } = {}) {
   const urls = {
     boundaries: '/api/overpass',
@@ -62,7 +64,7 @@ export function createApplicationRequestServices({
       throw new Error(`${label} unavailable (${response.status})`);
     return response.data;
   }
-  return {
+  const services = {
     boundaries: {
       async query(query, { signal } = {}) {
         const response = await request(urls.boundaries, {
@@ -125,4 +127,11 @@ export function createApplicationRequestServices({
       },
     },
   };
+  services.features =
+    features ??
+    createOverpassFeatureSource({
+      boundarySource: services.boundaries,
+      signal: lifetime,
+    });
+  return services;
 }