feat: Add origins route

Author: grant

README.md

@@ -8,7 +8,7 @@ The demo shows calling Google Maps Platform APIs from Google Cloud Functions.
 
 - Cloud Functions (Node 10)
   - [Function Framework](https://github.com/GoogleCloudPlatform/functions-framework-nodejs) for local development.
-- [Node.js Client for Google Maps Services](https://github.com/googlemaps/google-maps-services-js)
+- Google Maps Services ([Node.js Client](https://github.com/googlemaps/google-maps-services-js))
   - Place Details API
   - Places Photos API
   - Call Routes API

index.ts

@@ -1,16 +1,18 @@
 import {Request, Response} from 'express';
 
-import route1 from './src/route1';
-import route2 from './src/route2';
+import directions from './src/directions';
+import origins from './src/origins';
 
 /**
  * Entry point into the Functions Framework.
  * @see https://github.com/GoogleCloudPlatform/functions-framework-nodejs
  */
 exports.function = (req: Request, res: Response) => {
   const paths = {
-    '/foo': route1,
-    '/bar': route2,
+    '/directions': directions,
+    '/origins': origins,
+    // Default route (at the end)
+    '/': () => res.send(Object.keys(paths)),
   };
   // Find the first route that matches
   for (const [path, route] of Object.entries(paths)) {

src/route1.ts renamed to src/directions.ts

@@ -0,0 +1,48 @@
+import {Request, Response} from 'express';
+
+/**
+ * Returns an array of lat/lng origin locations.
+ * Simulates origin requests from many locations.
+ */
+export default (req: Request, res: Response) => {
+  // Validate query parameter.
+  const origin = req.query.origin;
+  if (!origin) {
+    return res.send({
+      error: 'Error: `origin` query parameter required. Example: /origins?origin=1',
+    });
+  }
+
+  // Select a random place around the origin.
+  const getDotAroundOrigin = () => {
+    const place0 = { lat: 37.621491, lng: -122.378912 }; // SFO
+    const place1 = { lat: 37.826837, lng: -122.498978 }; // Marin
+    const place2 = { lat: 37.769548, lng: -122.486010 }; // GG Park
+    const place3 = { lat: 37.795455, lng: -122.393306 }; // Ferry Building
+    const place4 = { lat: 37.808171, lng: -122.270019 }; // Fox Theatres
+    const place5 = { lat: 37.750565, lng: -122.203004 }; // Oracle Arena
+    const place6 = { lat: 37.715740, lng: -122.219267 }; // OAK
+    const place7 = { lat: 37.521822, lng: -121.924796 }; // Old Mission Park
+    const place8 = { lat: 37.368574, lng: -121.927630 }; // SJC
+    const place9 = { lat: 37.422051, lng: -122.084025 }; // Googleplex
+    const places = [place0, place1, place2, place3, place4, place5, place6, place7, place8, place9];
+    const place = places[+origin];
+
+    // Validate place
+    if (!place) return res.send('Error: Invalid `origin` query parameter. Example: /origins?origin=1');
+
+    // Randomize the dot's location a bit
+    const RANDOMNESS = 0.025;
+    place.lat += ((Math.random() - 0.5) * RANDOMNESS);
+    place.lng += ((Math.random() - 0.5) * RANDOMNESS);
+    return place;
+  };
+
+  // Select N dots
+  const N = 10;
+  const dots = [];
+  for (let i = 0; i < N; ++i) {
+    dots[i] = getDotAroundOrigin();
+  }
+  res.send(dots);
+};