WIP Add server side script to cache node positions (#21)

package.json

@@ -25,6 +25,7 @@
     "stream": "0.0.2",
     "timers": "^0.1.1",
     "timers-browserify": "^2.0.12",
+    "ts-node": "^10.9.1",
     "typescript": "^5.2.2",
     "xml2js": "^0.6.2"
   },
@@ -60,6 +61,7 @@
   },
   "homepage": "",
   "devDependencies": {
+    "@types/mapbox-gl": "^2.7.14",
     "@types/xml2js": "^0.4.12"
   }
 }

src/api/osm.ts

@@ -3,7 +3,9 @@ import { parseStringPromise } from 'xml2js';
 import { Way } from '../types';
 import { tagListToRecord } from '../utils/utils';
 
-export async function getOsmNodePosition(osmNode: string | number): Promise<{ lat: number, lon: number, tags: Record<string, string> }> {
+
+export async function getOsmNodePosition(osmNode: number): Promise<{ lat: number, lon: number, osmNodeID: number, tags: Record<string, string> }> {
+  try {
   const response: string = await (await fetch(`https://api.openstreetmap.org/api/0.6/node/${osmNode}`)).text();
   const osmApiResult = await parseStringPromise(response);
 
@@ -21,7 +23,12 @@ export async function getOsmNodePosition(osmNode: string | number): Promise<{ la
     tags[tag.$.k] = tag.$.v;
   });
 
-  return { lat, lon, tags };
+  return { lat, lon, tags, osmNodeID: osmNode };
+}catch(e) {
+  console.log(`Error fetching OSM node ${osmNode}: ${e}`);
+  throw e;
+
+}
 }
 
 export async function fetchOsmWaysForNode(nodeId: string | number): Promise<Way[]> {

src/types.ts

@@ -155,3 +155,15 @@ export interface SQLIntersectionWithId extends SQLIntersection {
   /** Unique serial id of intersection measurement */
   id: string; // Using string for uuid
 }
+
+
+/** A basic cache for the https://api.openstreetmap.org/api/0.6/node/... endpoint */
+export type OSMNodePositionCache = Record<number, OSMNodePosition>;
+
+/** Info returned from the OSM API */
+interface OSMNodePosition {
+  lat: number,
+  lon: number
+  /** OSM tags for the given node */
+  tags: Record<string, string>;
+}

tsconfig.json

@@ -1,11 +1,16 @@
 {
+  "ts-node": {
+    // these options are overrides used only by ts-node
+    // same as the --compilerOptions flag and the TS_NODE_COMPILER_OPTIONS environment variable
+    "compilerOptions": {
+      "module": "commonjs",
+      "esModuleInterop": true,
+      "typeRoots": ["./node_modules/@types"]
+    }
+  },
   "compilerOptions": {
     "target": "es6",
-    "lib": [
-      "dom",
-      "dom.iterable",
-      "esnext"
-    ],
+    "lib": ["dom", "dom.iterable", "esnext"],
     "allowJs": true,
     "skipLibCheck": true,
     "esModuleInterop": true,
@@ -19,7 +24,5 @@
     "noEmit": true,
     "jsx": "react"
   },
-  "include": [
-    "src"
-  ]
+  "include": ["src"]
 }