public void Start(Book.Book book, CollectionSettings collectionSettings, Color backColor)
{
if (_wifiAdvertiser != null)
{
Stop();
}
// This listens for a BloomReader to request a book.
// It requires a firewall hole allowing Bloom to receive messages on _portToListen.
// We initialize it before starting the Advertiser to avoid any chance of a race condition
// where a BloomReader manages to request an advertised book before we start the listener.
_wifiListener = new BloomReaderUDPListener();
_wifiListener.NewMessageReceived += (sender, args) =>
{
var json = Encoding.UTF8.GetString(args.Data);
try
{
dynamic settings = JsonConvert.DeserializeObject(json);
// The property names used here must match the ones in BloomReader, doInBackground method of SendMessage,
// a private class of NewBookListenerService.
var androidIpAddress = (string)settings.deviceAddress;
var androidName = (string)settings.deviceName;
// This prevents the device (or other devices) from queuing up requests while we're busy with this one.
// In effect, the Android is only allowed to request a retry after we've given up this try at sending.
// Of course, there are async effects from network latency. But if we do get another request while
// handling this one, we will ignore it, since StartSendBook checks for a transfer in progress.
_wifiAdvertiser.Paused = true;
StartSendBookOverWiFi(book, androidIpAddress, androidName, backColor);
// Returns immediately. But we don't resume advertisements until the async send completes.
}
// If there's something wrong with the JSON (maybe an obsolete or newer version of reader?)
// just ignore the request.
catch (Exception ex) when(ex is JsonReaderException || ex is JsonSerializationException)
{
_progress.Error(id: "BadBookRequest",
message: "Got a book request we could not process. Possibly the device is running an incompatible version of BloomReader?");
//this is too technical/hard to translate
_progress.ErrorWithoutLocalizing($" Request contains {json}; trying to interpret as JSON we got {ex.Message}");
}
};
var pathHtmlFile = book.GetPathHtmlFile();
_wifiAdvertiser = new WiFiAdvertiser(_progress)
{
BookTitle = BookStorage.SanitizeNameForFileSystem(book.Title), // must be the exact same name as the file we will send if requested
TitleLanguage = collectionSettings.Language1Iso639Code,
BookVersion = Book.Book.MakeVersionCode(File.ReadAllText(pathHtmlFile), pathHtmlFile)
};
AndroidView.CheckBookLayout(book, _progress);
_wifiAdvertiser.Start();
_progress.Message(id: "WifiInstructions1",
message: "On the Android, run Bloom Reader, open the menu and choose 'Receive Books from computer'.");
_progress.Message(id: "WifiInstructions2",
message: "You can do this on as many devices as you like. Make sure each device is connected to the same network as this computer.");
}
