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 StoreAdventureState(AdventureState state)
{
if (_adventurePlayerTable != null)
{
var jsonState = JsonConvert.SerializeObject(state, Formatting.None);
LogInfo($"storing state in player table\n{jsonState}");
await _dynamoClient.PutItemAsync(_adventurePlayerTable, new Dictionary <string, AttributeValue> {
["PlayerId"] = new AttributeValue {
S = state.RecordId
},
["State"] = new AttributeValue {
S = jsonState
},
["Expire"] = new AttributeValue {
N = ToEpoch(DateTime.UtcNow.AddDays(30)).ToString()
}
});
}
// local functions
uint ToEpoch(DateTime date)
{
return((uint)date.ToUniversalTime().Subtract(new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc)).TotalSeconds);
}
}
//--- Class Methods ---
public static void Main(string[] args)
{
var app = new CommandLineApplication {
Name = "AdventureBot.Cli",
FullName = "AdventureBot Command Line Interface",
Description = "Choose-Your-Adventure CLI"
};
app.HelpOption();
var filenameArg = app.Argument("<FILENAME>", "path to adventure file");
app.OnExecute(() => {
if (filenameArg.Value == null)
{
Console.WriteLine(app.GetHelpText());
return;
}
if (!File.Exists(filenameArg.Value))
{
app.ShowRootCommandFullNameAndVersion();
Console.WriteLine("ERROR: could not find file");
return;
}
// initialize the adventure from the adventure file
Adventure adventure;
try {
adventure = Adventure.LoadFrom(filenameArg.Value);
} catch (AdventureException e) {
Console.WriteLine($"ERROR: {e.Message}");
return;
} catch (Exception e) {
Console.WriteLine($"ERROR: unable to load file");
Console.WriteLine(e);
return;
}
// invoke adventure
var state = new AdventureState("cli", Adventure.StartPlaceId);
var engine = new AdventureEngine(adventure, state);
AdventureLoop(engine);
});
app.Execute(args);
}
public Adventure()
{
AdventureState = AdventureState.CREATION;
}
private async Task StoreAdventureState(AdventureState state)
{
}
private async Task <AdventureState> RestoreAdventureState(Adventure adventure, Session session)
{
var recordId = UserIdToSessionRecordKey(session.User.UserId);
AdventureState state = null;
if (session.New)
{
// check if the adventure state can be restored from the player table
if (_adventurePlayerTable != null)
{
// check if a session can be restored from the database
var record = await _dynamoClient.GetItemAsync(_adventurePlayerTable, new Dictionary <string, AttributeValue> {
["PlayerId"] = new AttributeValue {
S = recordId
}
});
if (record.IsItemSet)
{
state = JsonConvert.DeserializeObject <AdventureState>(record.Item["State"].S);
LogInfo($"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}");
}
}
