/// <summary>
/// Runs dialog system in the context of an ITurnContext.
/// </summary>
/// <param name="context">turn context.</param>
/// <param name="state">stored state.</param>
/// <param name="cancellationToken">cancelation token.</param>
/// <returns>result of the running the logic against the activity.</returns>
public async Task <DialogManagerResult> OnTurnAsync(ITurnContext context, PersistedState state = null, CancellationToken cancellationToken = default(CancellationToken))
{
var saveState = false;
var keys = GetKeys(context);
var storage = context.TurnState.Get <IStorage>();
if (state == null)
{
if (storage == null)
{
throw new Exception("DialogManager: unable to load the bots state.Bot.storage not assigned.");
}
state = await LoadStateAsync(storage, keys).ConfigureAwait(false);
saveState = true;
}
// Clone state to preserve original state
var newState = ObjectPath.Clone(state);
// Check for expired conversation
var now = DateTime.UtcNow;
if (this.ExpireAfter.HasValue && newState.ConversationState.ContainsKey(LASTACCESS))
{
var lastAccess = DateTime.Parse(newState.ConversationState[LASTACCESS] as string);
if ((DateTime.UtcNow - lastAccess) >= TimeSpan.FromMilliseconds((double)this.ExpireAfter))
{
// Clear conversation state
state.ConversationState = new Dictionary <string, object>();
state.ConversationState[ETAG] = newState.ConversationState[ETAG];
}
}
newState.ConversationState[LASTACCESS] = DateTime.UtcNow.ToString("u");
// Ensure dialog stack populated
DialogState dialogState;
if (!newState.ConversationState.ContainsKey(DIALOGS))
{
dialogState = new DialogState();
newState.ConversationState[DIALOGS] = dialogState;
}
else
{
dialogState = (DialogState)newState.ConversationState[DIALOGS];
}
var namedScopes = MemoryScope.GetScopesMemory(context);
namedScopes[ScopePath.USER] = newState.UserState;
namedScopes[ScopePath.CONVERSATION] = newState.ConversationState;
namedScopes[ScopePath.TURN] = new Dictionary <string, object>(StringComparer.InvariantCultureIgnoreCase);
// Create DialogContext
var dc = new DialogContext(
this.dialogSet,
context,
dialogState);
DialogTurnResult turnResult = null;
if (dc.ActiveDialog == null)
{
// start root dialog
turnResult = await dc.BeginDialogAsync(this.rootDialogId, cancellationToken : cancellationToken).ConfigureAwait(false);
}
else
{
// Continue execution
// - This will apply any queued up interruptions and execute the current/next step(s).
turnResult = await dc.ContinueDialogAsync(cancellationToken : cancellationToken).ConfigureAwait(false);
if (turnResult.Status == DialogTurnStatus.Empty)
{
// restart root dialog
turnResult = await dc.BeginDialogAsync(this.rootDialogId, cancellationToken : cancellationToken).ConfigureAwait(false);
}
}
// send trace of memory
await dc.Context.SendActivityAsync((Activity)Activity.CreateTraceActivity("BotState", "https://www.botframework.com/schemas/botState", dc.State.GetMemorySnapshot(), "Bot State")).ConfigureAwait(false);
// Save state if loaded from storage
if (saveState)
{
await DialogManager.SaveStateAsync(storage, keys : keys, newState : newState, oldState : state, eTag : "*").ConfigureAwait(false);
return(new DialogManagerResult()
{
TurnResult = turnResult
});
}
else
{
return(new DialogManagerResult()
{
TurnResult = turnResult, NewState = newState
});
}
}