public void Log()

in src/WebJobs.Script.WebHost/Diagnostics/AzureMonitorDiagnosticLogger.cs [61:137]
64 lines of code
12 McCabe index (conditional complexity)

        public void Log<TState>(LogLevel logLevel, EventId eventId, TState state, Exception exception, Func<TState, Exception, string> formatter)
        {
            if (!IsEnabled(logLevel))
            {
                return;
            }

            // Make sure we have something to log
            string formattedMessage = formatter?.Invoke(state, exception);
            if (string.IsNullOrEmpty(formattedMessage) && exception == null)
            {
                return;
            }

            (string exceptionType, string exceptionMessage, string exceptionDetails) = exception.GetExceptionDetails();
            if (exception != null)
            {
                formattedMessage = Sanitizer.Sanitize(formattedMessage);
            }

            // enumerate all the state values once, capturing the values we'll use below
            // last one wins
            string stateFunctionName = null;
            if (state is IEnumerable<KeyValuePair<string, object>> stateProps)
            {
                foreach (var kvp in stateProps)
                {
                    if (Utility.IsFunctionName(kvp))
                    {
                        stateFunctionName = kvp.Value?.ToString();
                    }
                }
            }

            var scopeProps = _scopeProvider.GetScopeDictionaryOrNull();
            string functionName = stateFunctionName;
            if (string.IsNullOrEmpty(functionName))
            {
                if (Utility.TryGetFunctionName(scopeProps, out string scopeFunctionName))
                {
                    functionName = scopeFunctionName;
                }
            }

            // Build up a JSON string for the Azure Monitor 'properties' bag
            StringWriter sw = new StringWriter();
            using (JsonTextWriter writer = new JsonTextWriter(sw) { Formatting = Formatting.None })
            {
                writer.WriteStartObject();
                WritePropertyIfNotNull(writer, "appName", _appServiceOptions.AppName);
                WritePropertyIfNotNull(writer, "roleInstance", _roleInstance);
                WritePropertyIfNotNull(writer, "message", formattedMessage);
                WritePropertyIfNotNull(writer, "category", _category);
                WritePropertyIfNotNull(writer, "hostVersion", _hostVersion);
                WritePropertyIfNotNull(writer, "functionInvocationId", Utility.GetValueFromScope(scopeProps, ScopeKeys.FunctionInvocationId));
                WritePropertyIfNotNull(writer, "functionName", functionName);
                WritePropertyIfNotNull(writer, "hostInstanceId", _hostInstanceId);
                WritePropertyIfNotNull(writer, "activityId", Utility.GetValueFromScope(scopeProps, ScriptConstants.LogPropertyActivityIdKey));
                WritePropertyIfNotNull(writer, "level", logLevel.ToString());
                WritePropertyIfNotNull(writer, "levelId", (int)logLevel);
                WritePropertyIfNotNull(writer, "processId", _processId);
                WritePropertyIfNotNull(writer, nameof(exceptionDetails), exceptionDetails);
                WritePropertyIfNotNull(writer, nameof(exceptionMessage), exceptionMessage);
                WritePropertyIfNotNull(writer, nameof(exceptionType), exceptionType);

                // Only write the event if it's relevant
                if (eventId.Id != 0 || !string.IsNullOrEmpty(eventId.Name))
                {
                    WriteProperty(writer, "eventId", eventId.Id);
                    WriteProperty(writer, "eventName", eventId.Name);
                }

                writer.WriteEndObject();
            }

            _eventGenerator.LogAzureMonitorDiagnosticLogEvent(logLevel, _hostNameProvider.Value, AzureMonitorOperationName, AzureMonitorCategoryName, _regionName, sw.ToString());
        }