/// <summary>
/// Interpret a server's handshake, either requesting a package
/// of strings or completing the handshake.
///
/// Uncached flow: <code>
/// Client | Server
/// | <-------------- Hash | <- you are here on client
/// | Need Strings ------> |
/// | <----------- Strings |
/// | Dont Need Strings -> |
/// </code>
///
/// Cached flow: <code>
/// Client | Server
/// | <-------------- Hash | <- you are here on client
/// | Dont Need Strings -> |
/// </code>
///
/// Verification failure flow: <code>
/// Client | Server
/// | <-------------- Hash | <- you are here on client
/// | Need Strings ------> |
/// | <----------- Strings |
/// + Hash Failed |
/// | Need Strings ------> |
/// | <----------- Strings |
/// | Dont Need Strings -> |
/// </code>
///
/// NOTE: Verification failure flow is currently not implemented.
/// </summary>
/// <exception cref="InvalidOperationException">Mapped strings are locked.</exception>
/// <seealso cref="NetworkInitialize"/>
private void HandleServerHandshake(MsgMapStrServerHandshake msgMapStr)
{
DebugTools.Assert(_net.IsClient);
_serverHash = msgMapStr.Hash;
var hashStr = ConvertToBase64Url(msgMapStr.Hash !);
LogSzr.Debug($"Received server handshake with hash {hashStr}.");
var fileName = CacheForHash(hashStr);
if (!File.Exists(fileName))
{
LogSzr.Debug($"No string cache for {hashStr}.");
var handshake = _net.CreateNetMessage <MsgMapStrClientHandshake>();
LogSzr.Debug("Asking server to send mapped strings.");
handshake.NeedsStrings = true;
msgMapStr.MsgChannel.SendMessage(handshake);
}
else
{
LogSzr.Debug($"We had a cached string map that matches {hashStr}.");
using var file = File.OpenRead(fileName);
var added = _dict.LoadFromPackage(file, out _);
_stringMapHash = msgMapStr.Hash !;
LogSzr.Debug($"Read {added} strings from cache {hashStr}.");
LogSzr.Debug($"Locked in at {_dict.StringCount} mapped strings.");
// ok we're good now
var channel = msgMapStr.MsgChannel;
OnClientCompleteHandshake(_net, channel);
}
}
private void HandleServerHandshake(MsgMapStrServerHandshake message)
{
ClientHandshakeComplete?.Invoke();
}