private async Task <AdventureState> RestoreAdventureState(Adventure adventure, Session session)
{
AdventureState state = null;
// attempt to deserialize the player information
if (session.New)
{
LogInfo("new session started");
}
else if (!session.Attributes.TryGetValue(SESSION_STATE_KEY, out object playerStateValue) || !(playerStateValue is JObject playerState))
{
LogWarn($"unable to find player state in session (type: {playerStateValue?.GetType().Name})\n" + JsonConvert.SerializeObject(session));
}
else
{
state = playerState.ToObject <AdventureState>();
// validate the adventure still has a matching place for the player
if (!adventure.Places.ContainsKey(state.CurrentPlaceId))
{
LogWarn($"unable to find matching place for restored player in session (value: '{state.CurrentPlaceId}')\n" + JsonConvert.SerializeObject(session));
// reset player
state.Reset(Adventure.StartPlaceId);
}
}
// create new player if no player was restored
if (state == null)
{
LogInfo("new player session started");
state = new AdventureState(Adventure.StartPlaceId);
}
return(state);
}
private async Task <AdventureState> RestoreAdventureState(Adventure adventure, Session session)
{
var recordId = UserIdToSessionRecordKey(session.User.UserId);
AdventureState state = null;
if (session.New)
{
// check if the adventure state can be restored from the player table
if (_adventurePlayerTable != null)
{
// check if a session can be restored from the database
var record = await _dynamoClient.GetItemAsync(_adventurePlayerTable, new Dictionary <string, AttributeValue> {
["PlayerId"] = new AttributeValue {
S = recordId
}
});
if (record.IsItemSet)
{
state = JsonConvert.DeserializeObject <AdventureState>(record.Item["State"].S);
LogInfo($"restored state from player table\n{record.Item["State"].S}");
// check if the place the player was in still exists or if the player had reached an end state
if (!adventure.Places.TryGetValue(state.CurrentPlaceId, out AdventurePlace place))
{
LogWarn($"unable to find matching place for restored state from player table (value: '{state.CurrentPlaceId}')");
// reset player
state.Reset(Adventure.StartPlaceId);
}
else if (place.Finished)
{
LogInfo("restored player had reached end place");
// reset player
state.Reset(Adventure.StartPlaceId);
}
else if (state.CurrentPlaceId == Adventure.StartPlaceId)
{
// reset player
state.Reset(Adventure.StartPlaceId);
}
}
else
{
LogInfo("no previous state found in player table");
}
}
}
else
{
// attempt to deserialize the player information
if (!session.Attributes.TryGetValue(SESSION_STATE_KEY, out object playerStateValue) || !(playerStateValue is JObject playerState))
{
LogWarn($"unable to find player state in session (type: {playerStateValue?.GetType().Name})\n" + JsonConvert.SerializeObject(session));
}
else
{
state = playerState.ToObject <AdventureState>();
// validate the adventure still has a matching place for the player
if (!adventure.Places.ContainsKey(state.CurrentPlaceId))
{
LogWarn($"unable to find matching place for restored player in session (value: '{state.CurrentPlaceId}')\n" + JsonConvert.SerializeObject(session));
// reset player
state.Reset(Adventure.StartPlaceId);
}
}
}
// create new player if no player was restored
if (state == null)
{
LogInfo("new player session started");
state = new AdventureState(recordId, Adventure.StartPlaceId);
}
return(state);
// local functions
string UserIdToSessionRecordKey(string userId)
{
var md5 = System.Security.Cryptography.MD5.Create().ComputeHash(Encoding.UTF8.GetBytes(userId));
return($"resume-{new Guid(md5):N}");
}
}