private async Task PollAsync(CancellationToken cancellationToken)
{
var translatorName = typeof(TTranslator).FullName;
using (var context = _scope.ServiceProvider.GetRequiredService <SIOTranslatorDbContext>())
{
_translatorState = context.TranslatorStates.FirstOrDefault(ps => ps.Name == translatorName);
if (_translatorState == null)
{
_translatorState = new TranslatorState
{
Name = translatorName,
CreatedDate = DateTimeOffset.UtcNow,
Position = 0
};
context.TranslatorStates.Add(_translatorState);
await context.SaveChangesAsync();
}
while (!cancellationToken.IsCancellationRequested)
{
try
{
await context.Entry(_translatorState).ReloadAsync();
var page = await _eventStore.TryGetEventsAsync(_translatorState.Position);
foreach (var @event in page.Events)
{
await _translator.HandleAsync(@event);
}
if (_translatorState.Position == page.Offset)
{
await Task.Delay(500);
}
else
{
_translatorState.Position = page.Offset;
_translatorState.LastModifiedDate = DateTimeOffset.UtcNow;
await context.SaveChangesAsync();
}
}
catch (Exception ex)
{
_logger.LogCritical(ex, $"Projection '{typeof(TTranslator).Name}' failed at postion '{_translatorState.Position}' due to an unexpected error. See exception details for more information.");
break;
}
}
}
}
private static void TranslateHTMLLineToTXTLine(string line, out string[] outputLines)
{
var outputList = new List <string>();
string tag = "";
string outputStr = "";
TranslatorState translatorState = TranslatorState.Neutral;
foreach (var character in line)
{
switch (translatorState)
{
case TranslatorState.Neutral:
{
if (character == '<')
{
tag = "";
translatorState = TranslatorState.ReadingTag;
}
else if (character == '&')
{
translatorState = TranslatorState.ReadingHTMLSymbol;
}
else
{
outputStr += character;
}
break;
}
case TranslatorState.ReadingHTMLSymbol:
{
if (character == ';')
{
translatorState = TranslatorState.Neutral;
}
break;
}
case TranslatorState.ReadingTag:
{
if (character == ' ' && tag == "img")
{
tag = "";
if (!string.IsNullOrEmpty(outputStr))
{
outputList.Add(outputStr);
outputStr = "";
}
translatorState = TranslatorState.ExpectImagePath;
}
else if (character == '>')
{
translatorState = TranslatorState.Neutral;
}
else
{
tag += character;
}
break;
}
case TranslatorState.ExpectImagePath:
{
if (character == '"')
{
translatorState = TranslatorState.ReadingImagePath;
}
else if (character == '>')
{
translatorState = TranslatorState.Neutral;
}
break;
}
case TranslatorState.ReadingImagePath:
{
if (character == '"')
{
if (!string.IsNullOrEmpty(outputStr))
{
outputList.Add($"<{outputStr}>");
outputStr = "";
}
translatorState = TranslatorState.ReadingTag;
}
else
{
outputStr += character;
}
break;
}
default:
Debug.Fail("This case doesn't exist yet.");
break;
}
}
outputList.Add(outputStr);
outputLines = outputList.ToArray();
}