public async Task Run([TimerTrigger("0 */5 * * * *", RunOnStartup = true)] TimerInfo timerInfo)
{
logger.LogInformation("Starting");
using var client = new ImapClient();
logger.LogDebug("Connecting to {HostName}:{Port}", options.HostName, options.Port);
await client.ConnectAsync(options.HostName, options.Port);
logger.LogDebug("Authenticating {UserName}", options.UserName);
await client.AuthenticateAsync(options.UserName, options.Password);
logger.LogInformation("Connected");
var inbox = client.Inbox;
await inbox.OpenAsync(FolderAccess.ReadOnly);
var state = await stateProvider.Read();
if (state.HighestModSeq >= inbox.HighestModSeq)
{
logger.LogInformation("Mailbox is unchanged");
return;
}
var historyQuery = state.HighestModSeq == 0
? SearchQuery.DeliveredAfter(DateTime.UtcNow.Subtract(options.MaximumMessageAge))
: SearchQuery.ChangedSince(state.HighestModSeq);
foreach (var processor in processors)
{
logger.LogInformation("Processing {0}", processor.Description);
var query = SearchQuery.And(historyQuery, processor.Query);
var ids = await inbox.SearchAsync(query);
foreach (var id in ids)
{
var message = await inbox.GetMessageAsync(id);
if (state.KnownMessageIds.Contains(message.MessageId))
{
logger.LogDebug("Skipping known message id {MessageId}", message.MessageId);
continue;
}
var isProcessed = await processor.Process(message);
if (isProcessed)
{
logger.LogDebug("Adding message id {MessageId} to known message IDs", message.MessageId);
state.KnownMessageIds.Add(message.MessageId);
}
}
}
state.HighestModSeq = inbox.HighestModSeq;
client.Disconnect(true);
await stateProvider.Write(state);
}