public void Log <TState>(LogLevel logLevel, EventId eventId, TState state, Exception exception, Func <TState, Exception, string> formatter)
{
// We don't support any other type of state.
IEnumerable <KeyValuePair <string, object> > properties = state as IEnumerable <KeyValuePair <string, object> >;
string formattedMessage = formatter?.Invoke(state, exception);
if (string.IsNullOrEmpty(formattedMessage) || properties == null || !IsEnabled(logLevel) || IsFromTraceWriter(properties))
{
return;
}
IDictionary <string, object> scopeProperties = DictionaryLoggerScope.GetMergedStateDictionary();
if (!scopeProperties.TryGetValue(ScriptConstants.LoggerFunctionNameKey, out string functionName))
{
// We have nowhere to write the file if we don't know the function name
return;
}
// this function name starts with "Functions.", but file paths do not include this
string functionsPrefix = "Functions.";
if (functionName.StartsWith(functionsPrefix))
{
functionName = functionName.Substring(functionsPrefix.Length);
}
TraceWriter traceWriter = _writerCache.GetOrAdd(functionName, (n) => CreateFileTraceWriter(n, _config));
TraceLevel traceLevel = GetTraceLevel(logLevel);
TraceEvent traceEvent = new TraceEvent(traceLevel, formattedMessage, _categoryName, exception);
traceWriter.Trace(traceEvent);
}
private static string GetFunctionName()
{
IDictionary <string, object> scopeProperties = DictionaryLoggerScope.GetMergedStateDictionary();
if (!scopeProperties.TryGetValue(ScriptConstants.LoggerFunctionNameKey, out string functionName))
{
return(null);
}
// this function name starts with "Functions.", but file paths do not include this
string functionsPrefix = "Functions.";
if (functionName.StartsWith(functionsPrefix))
{
functionName = functionName.Substring(functionsPrefix.Length);
}
return(functionName);
}