Added blackbox plugin

Press 'r' in the cockpit to start/stop recording of
the mission data. Each recording has its own folder
and contains the raw navdata json and a formatted
motion stream in a csv file.

More data will be added (e.g.logging of events & commands)

Closes #7

plugins/blackbox/index.js

@@ -0,0 +1,83 @@
+var fs = require('fs');
+var path = require('path');
+var df = require('dateformat');
+
+var client
+  , io
+  , config
+  , navStream
+  , motionStream
+  , recording = false
+  ;
+
+function blackbox(name, deps) {
+
+    client = deps.client;
+    io = deps.io;
+    config = deps.config;
+
+    deps.io.sockets.on('connection', function (socket) {
+        socket.on('/blackbox/start', function (cmd) {
+            _start();
+        });
+        socket.on('/blackbox/stop', function (cmd) {
+            _stop();
+        });
+    });
+
+    deps.client.on('navdata', function(data) {
+        _record(data);
+    });
+
+};
+
+function _start() {
+   if (recording) return;
+   console.log("Start recording navigation data");
+   if (config && config.blackbox && config.blackbox.path) {
+       var root = config.blackbox.path;
+   } else {
+       var root = ".";
+   }
+   var folder = df(new Date(), "yyyy-mm-dd_hh-MM-ss");
+   fs.mkdir(path.join(root, folder), function() {
+      navStream = fs.createWriteStream(path.join(root, folder, 'navdata.txt'));
+      motionStream = fs.createWriteStream(path.join(root, folder, 'motion.txt')); 
+      motionStream.write("seq,pitch,roll,yaw,xVelocity,yVelocity,zVelocity,altitude\n", function() {
+          recording = true;
+          io.sockets.emit('/message', "Blackbox started recording NavData.");
+      });
+    });
+}
+
+function _stop() {
+    if (!recording) return;
+    console.log("Stopped recording navigation data");
+    recording = false;
+    navStream.end();
+    motionStream.end();
+    io.sockets.emit('/message', "Blackbox stopped recording NavData.");
+}
+
+function _record(data) {
+    if (!recording) return;
+
+    navStream.write(JSON.stringify(data) + "\n");
+    
+    var seq   = data.sequenceNumber
+      , pitch = data.demo.rotation.pitch
+      , roll  = data.demo.rotation.roll
+      , yaw   = data.demo.rotation.yaw
+      , vx    = data.demo.velocity.x
+      , vy    = data.demo.velocity.y
+      , vz    = data.demo.velocity.z
+      , z     = data.demo.altitude
+      ;
+
+    motionStream.write(seq + "," + pitch + "," + roll + "," + yaw + "," + vx + "," + vy + "," + vz + "," + z + "\n");
+}
+
+function _writeHeader(stream, cb) {
+}
+
+module.exports = blackbox;

plugins/blackbox/public/js/blackbox.js

@@ -0,0 +1,42 @@
+(function(window, document) {
+        'use strict';
+
+        /*
+         * Constructuor
+         */
+        var Blackbox = function Blackbox(cockpit) {
+                console.log("Loading Blackbox plugin.");
+                this.cockpit = cockpit;
+                this.recording = false;
+
+                // Register the various event handlers
+                this.listen();
+        };
+
+        /*
+         * Register keyboard event listener
+         */
+        Blackbox.prototype.listen = function listen() {
+                var self = this;
+                $(document).keydown(function(ev) {
+                        self.keyDown(ev);
+                });
+        };
+
+        /*
+         * Process onkeydown. 
+         */
+        Blackbox.prototype.keyDown = function keyDown(ev) {
+                if ([ev.keyCode] != 82) {
+                        return;
+                } 
+                ev.preventDefault();
+
+                this.recording = !this.recording;
+                var cmd = this.recording ? "stop" : "start";
+                this.cockpit.socket.emit("/blackbox/" + cmd, {});
+        };
+
+        window.Cockpit.plugins.push(Blackbox);
+
+}(window, document));