/// <summary>
/// Creates a log entry, actually a log info instance, fill the properties of that log info, and then passes it to the associated logger provider.
/// <para>WARNING: It's easier to use the ILogger extension methods than this method, since it requires a lot of parameters, so calling it could be a very complicated action.</para>
/// </summary>
void ILogger.Log <TState>(LogLevel logLevel, EventId eventId, TState state, Exception exception, Func <TState, Exception, string> formatter)
{
if ((this as ILogger).IsEnabled(logLevel))
{
LogEntry entry = new LogEntry
{
Category = Category,
Level = logLevel,
// well, the passed default formatter function does not takes the exception into account
// SEE: https://github.com/aspnet/Extensions/blob/master/src/Logging/Logging.Abstractions/src/LoggerExtensions.cs
Text = exception?.Message ?? state.ToString(), // formatter(state, exception)
Exception = exception,
EventId = eventId,
State = state
};
// well, you never know what it really is
if (state is string s)
{
entry.StateText = s;
}
// in case we have to do with a message template, lets get the keys and values (for Structured Logging providers)
// SEE: https://docs.microsoft.com/en-us/aspnet/core/fundamentals/logging#log-message-template
// SEE: https://softwareengineering.stackexchange.com/questions/312197/benefits-of-structured-logging-vs-basic-logging
else if (state is IEnumerable <KeyValuePair <string, object> > stateProps)
{
entry.StateProperties = stateProps.ToDictionary(x => x.Key, x => x.Value);
}
// gather info about scope(s), if any
if (Provider.ScopeProvider is not null)
{
Provider.ScopeProvider.ForEachScope((value, loggingProps) =>
{
entry.Scopes ??= new List <LogScopeInfo>();
LogScopeInfo Scope = new LogScopeInfo();
entry.Scopes.Add(Scope);
if (value is string s)
{
Scope.Text = s;
}
else if (value is IEnumerable <KeyValuePair <string, object> > props)
{
Scope.Properties = props.ToDictionary(x => x.Key, x => x.Value);
}
}, state);
}
Provider.WriteLog(entry);
}
}
/// <summary> Формирование строки из элемента лога и запись в файл </summary>
private void WriteLogFile()
{
if (!_queue.TryDequeue(out LogEntry log))
{
return;
}
var sb = new StringBuilder();
sb.Append(Pad(log.TimeStampUtc.ToLocalTime().ToString("yyyy-MM-dd HH:mm:ss.ff"), _lengths["Time"]));
sb.Append(Pad(log.HostName, _lengths["Host"]));
sb.Append(Pad(log.UserName, _lengths["User"]));
sb.Append(Pad(log.Level.ToString(), _lengths["Level"]));
sb.Append(Pad(log.EventId.ToString(), _lengths["EventId"]));
sb.Append(Pad(log.Category, _lengths["Category"]));
string s = string.Empty;
if (log.Scopes != null && log.Scopes.Count > 0)
{
LogScopeInfo scopeInfo = log.Scopes.Last();
if (!string.IsNullOrWhiteSpace(scopeInfo.Text))
{
s = scopeInfo.Text;
}
}
sb.Append(Pad(s, _lengths["Scope"]));
string text = log.Text;
//Пример сохранения свойств
//if (log.StateProperties != null && log.StateProperties.Count > 0)
//{
// text = text + " Properties = " + JsonConvert.SerializeObject(log.StateProperties);
//}
if (!string.IsNullOrWhiteSpace(text))
{
sb.Append(text.Replace("\r\n", " ").Replace("\r", " ").Replace("\n", " "));
}
sb.AppendLine();
WriteLine(sb.ToString());
}
