public async Task Add(
[Help("channel", "The guild channel of this server.")] ITextChannel textChannel,
[Help("linkChannelId", "The ID of the channel from the other server that you wish to link to the selected 'channel'.", "example: 334120131626621412")] ulong linkChannelId,
[Help("date", "The optional date-time for the first post to synchronise.", "example: \"2020-01-01 10:00 AM\"")] DateTime?fromDate = null)
{
if (!Permissions.IsBotOwner(Context))
{
await Context.ApplyResultReaction(CommandResult.FailedUserPermission).ConfigureAwait(false);
return;
}
var linkChannel = _discordClient.GetChannel(linkChannelId) as ITextChannel;
if (textChannel == null || linkChannel == null)
{
await Context.ApplyResultReaction(CommandResult.FailedBotPermission).ConfigureAwait(false);
return;
}
var link = await LinkUtility.TryAddLinkAsync(LinkType.Discord, textChannel, linkChannel.Id.ToString(), fromDate).ConfigureAwait(false);
Log.Debug($"Added link {link.Id}: {linkChannelId} -> {textChannel.Id}");
await Context.ApplyResultReaction(link == null?CommandResult.Failed : CommandResult.Success).ConfigureAwait(false);
}
static DiscordLinkUtility()
{
LastUpdate = new ConcurrentDictionary <int, DateTime>();
_reconnecting = false;
_initialLogin = true;
_discordClient = new DiscordClientEx(new DiscordSocketConfig()
{
MessageCacheSize = Ditto.Settings.Cache.AmountOfCachedMessages,
LogLevel = LogSeverity.Warning,
ConnectionTimeout = (int)(Ditto.Settings.Timeout * 60),
HandlerTimeout = (int)(Ditto.Settings.Timeout * 60),
DefaultRetryMode = RetryMode.AlwaysRetry,
});
var loginAction = new Func <Task>(async() =>
{
// Cancel out when already reconnecting
if (_reconnecting)
{
return;
}
if (!_initialLogin)
{
Log.Info("Reconnecting discord slave user...");
}
// Attempt to continuously reconnect.
_reconnecting = true;
_connected = false;
int retryAttempt = 0;
while (true)
{
try
{
await _discordClient.LoginAsync(0, Ditto.Settings.Credentials.UserSlaveToken, true);
await _discordClient.StartAsync().ConfigureAwait(false);
_reconnecting = false;
break;
}
catch
{
if (_initialLogin)
{
_initialLogin = false;
Log.Error("Slave user could not connect at first login, will not retry further.");
break;
}
else
{
_initialLogin = false;
Log.Warn($"Slave user could not connect ({++retryAttempt})");
await Task.Delay(500).ConfigureAwait(false);
}
}
}
});
_discordClient.Connected += () =>
{
_connected = true;
Log.Info("Slave user connected!");
return(Task.CompletedTask);
};
_discordClient.Disconnected += (ex) =>
{
if (!_initialLogin)
{
Log.Warn($"Slave user has been disconnected.");
Task.Run(() => loginAction());
}
else
{
_initialLogin = false;
_reconnecting = false;
Log.Error("Slave user could not connect at first login, will not retry further.");
return(_discordClient.StopAsync());
}
return(Task.CompletedTask);
};
_discordClient.LoggedOut += () =>
{
if (!_initialLogin)
{
Log.Warn($"Slave user got logged out.");
Task.Run(() => loginAction());
}
return(Task.CompletedTask);
};
Task.Run(async() =>
{
await loginAction().ConfigureAwait(false);
});
LinkUtility.TryAddHandler(LinkType.Discord, async(link, channel, cancellationToken) =>
{
var messageIds = new List <string>();
// Only pull discord channel feeds every 2 minutes for each individual channel.
var lastUpdateTime = LastUpdate.GetOrAdd(link.Id, DateTime.MinValue);
if (!_connected || (DateTime.UtcNow - lastUpdateTime).TotalSeconds < 120)
{
return(messageIds);
}
if (link != null)
{
if (ulong.TryParse(link.Value, out ulong linkChannelId))
{
if (_discordClient.GetChannel(linkChannelId) is ITextChannel linkChannel)
{
// Retrieve the latest messages in bulk from the targeted channel.
var messages = new List <IMessage>();
ulong lastMessageId = ulong.MaxValue;
while (true)
{
if (cancellationToken.IsCancellationRequested)
{
return(messageIds);
}
var messagesChunk = Enumerable.Empty <IMessage>();
if (lastMessageId != ulong.MaxValue)
{
messagesChunk = (await linkChannel.GetMessagesAsync(lastMessageId, Direction.Before, 100, CacheMode.AllowDownload).ToListAsync().ConfigureAwait(false))
.SelectMany(m => m)
.Where(m => m.CreatedAt.UtcDateTime > link.Date)
.Where(m => null == link.Links.FirstOrDefault(l => l.Identity == m.Id.ToString()));
}
else
{
messagesChunk = (await linkChannel.GetMessagesAsync(100, CacheMode.AllowDownload).ToListAsync().ConfigureAwait(false))
.SelectMany(m => m)
.Where(m => m.CreatedAt.UtcDateTime > link.Date)
.Where(m => null == link.Links.FirstOrDefault(l => l.Identity == m.Id.ToString()));
}
messages.AddRange(messagesChunk);
lastMessageId = messagesChunk.LastOrDefault()?.Id ?? ulong.MaxValue;
// Cancel when message count is less than the maximum.
if (messagesChunk.Count() < 100)
{
break;
}
}
// Update link date-time.
var lastMessageDate = DateTime.MinValue;
var funcUpdateLinkDate = new Func <Task>(async() =>
{
if (lastMessageDate > link.Date)
{
link.Date = lastMessageDate;
await Ditto.Database.WriteAsync(uow =>
{
uow.Links.Update(link);
}).ConfigureAwait(false);
await Task.Delay(10).ConfigureAwait(false);
}
});
// Attempt to post the messages in sync with the created date.
try
{
var guildUsers = new List <IGuildUser>();
foreach (var message in messages.OrderBy(m => m.CreatedAt))
{
int retryCount = 0;
while (retryCount < 10)
{
// Cancel out where needed
if (cancellationToken.IsCancellationRequested)
{
await funcUpdateLinkDate().ConfigureAwait(false);
return(messageIds);
}
// Attempt to send the message.
try
{
var authorGuildUser = guildUsers.FirstOrDefault(x => x.Id == message.Author.Id);
if (authorGuildUser == null)
{
try
{
authorGuildUser = await linkChannel.Guild.GetUserAsync(message.Author.Id).ConfigureAwait(false);
if (authorGuildUser != null)
{
guildUsers.Add(authorGuildUser);
}
}
catch { }
}
var dateUtc = message.CreatedAt.UtcDateTime;
var embedBuilder = new EmbedBuilder().WithAuthor(new EmbedAuthorBuilder()
.WithIconUrl(message.Author.GetAvatarUrl())
.WithName(authorGuildUser?.Nickname ?? message.Author?.Username)
)
//.WithTitle(message.Channel.Name)
.WithDescription(message.Content)
.WithFooter($"{dateUtc:dddd, MMMM} {dateUtc.Day.Ordinal()} {dateUtc:yyyy} at {dateUtc:HH:mm} UTC")
.WithDiscordLinkColour(channel.Guild)
;
if (message.Attachments.Count > 0)
{
embedBuilder.WithImageUrl(message.Attachments.FirstOrDefault().Url);
}
var postedMessage = await channel.SendMessageAsync(embed: embedBuilder.Build(), options: new RequestOptions()
{
RetryMode = RetryMode.AlwaysFail
}).ConfigureAwait(false);
if (postedMessage != null)
{
// Do not add the message to the messageIds, we do not use the link_items database for this.
//messageIds.Add(message.Id.ToString());
lastMessageDate = message.CreatedAt.UtcDateTime;
}
// OK, cancel out.
break;
}
catch (Exception ex)
{
// Update the link date just in case.
await funcUpdateLinkDate().ConfigureAwait(false);
// Cancel out where needed
if (cancellationToken.IsCancellationRequested)
{
return(messageIds);
}
// Attempt to retry sending the message
if (!await LinkUtility.SendRetryLinkMessageAsync(link.Type, retryCount++, ex is Discord.Net.RateLimitedException ? null : ex))
{
return(messageIds);
}
}
}
}
}
finally
{
// Update the link date time.
await funcUpdateLinkDate().ConfigureAwait(false);
}
}
}
}
LastUpdate.TryUpdate(link.Id, DateTime.UtcNow, lastUpdateTime);
return(messageIds);
});
}