Add very simple example server

README.md

@@ -27,6 +27,10 @@ However other platforms will fall back to a source compile: see [Source Build](#
 
 # Usage
 
+See the `example/server.js` and `test/osrm.test.js` for examples of using OSRM through this Node.js API.
+
+# Setup
+
 The `node-osrm` module consumes data processed by OSRM core.
 
 This repository contains a Makefile that does this automatically:

example/server.js

@@ -0,0 +1,36 @@
+var express = require('express');
+var osrm = require('../');
+
+var app = express();
+var use_shared_memory = true;
+var opts = new osrm.Options('test/data/berlin.ini', use_shared_memory);
+var engine = new osrm.Engine(opts);
+
+// Accepts a query like:
+// http://localhost:8888?start=52.519930,13.438640&end=52.513191,13.415852
+app.get('/', function(req, res) {
+    if (!req.query.start || !req.query.end) {
+        return res.json({"error":"invalid start and end query"});
+    }
+    var coordinates = [];
+    var start = req.query.start.split(',')
+    coordinates.push([+start[0],+start[1]]);
+    var end = req.query.end.split(',')
+    coordinates.push([+end[0],+end[1]]);
+    var query = new osrm.Query({
+        coordinates: coordinates,
+        alternateRoute: req.query.alternatives !== 'false'
+    });
+    engine.run(query, function(err, result) {
+        if (err) return res.json({"error":err.message});
+        try {
+            return res.json(JSON.parse(result));
+        } catch (err) {
+            return res.send(result);
+        }
+    });
+});
+
+console.log('Listening on port: ' + 8888);
+app.listen(8888);
+