[node] switch to NodeRequest member fn callback

For (hopefully) better performance than creating a new v8::Context to
wrap each callback while still avoiding leaking memory with v8::FunctionTemplate.

Adds a JavaScript shim in front of module.exports.Map to wrap the
req.respond API internally and preserve the public callback-passing
API, while still exporting the correct prototype.

1 files changed, 31 insertions, 0 deletions

diff --git a/platform/node/index.js b/platform/node/index.js
new file mode 100644
index 0000000000..8c59023847
--- /dev/null
+++ b/platform/node/index.js
@@ -0,0 +1,31 @@
+"use strict";
+
+// Shim to wrap req.respond while preserving callback-passing API
+
+var mbgl = require('../../lib/mapbox-gl-native.node');
+var constructor = mbgl.Map.prototype.constructor;
+
+var Map = function(options) {
+    if (!(options instanceof Object)) {
+        throw TypeError("Requires an options object as first argument");
+    }
+
+    if (!options.hasOwnProperty('request') || !(options.request instanceof Function)) {
+        throw TypeError("Options object must have a 'request' method");
+    }
+
+    var request = options.request;
+
+    return new constructor(Object.assign(options, {
+        request: function(req) {
+            request(req, function() {
+                req.respond.apply(req, arguments);
+            });
+        }
+    }));
+};
+
+Map.prototype = mbgl.Map.prototype;
+Map.prototype.constructor = Map;
+
+module.exports = Object.assign(mbgl, { Map: Map });