invadersapp | Space invaders in an app

We start off with spinning out a separate goroutine to run the web app, then displaying a static HTML page from the webview. See how creating the webview is just a single line of code! If you compare this with Electron, this is pretty awesome. Electron has quite a bit more features of course, but for something simple and straightforward, you just can't beat this. The web app is simple and straightforward. I didn't use anything fancy, it's just your typical Go web app with 3 handlers. It also serves out html and other assets through a directory named public. The start handler starts the game, the frame handler returns the frame and the key handler receives the keyboard events. The start handler starts generating frames in a separate goroutine, then calls the invaders.html template, passing it the frame rate. The captureKeys handler receives keyboard events from the webview and takes action accordingly. If the game ended, you can restart or quit the game. Otherwise all keyboard events are placed into the events channel. At every interval, the webview will call getFrame for the frame. The frame is a image data URI with the base64 encoded image. This is then passed on to the <img> tag in the HTML template (which we'll see later). Notice that we set the Cache-Control header to no-cache. This is a workaround for MSHTML (in Windows specifically) because otherwise the image frame will cached and the game will be stuck at the first frame.