aspnetcore/test/Microsoft.AspNet.Authentication.Test/OpenIdConnect/InMemoryLogger.cs

// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.

using System;
using System.Collections.Generic;
using System.Diagnostics;
using Microsoft.Extensions.Logging;

namespace Microsoft.AspNet.Authentication.Tests.OpenIdConnect
{
    public class InMemoryLogger : ILogger, IDisposable
    {
        LogLevel _logLevel = 0;

        public InMemoryLogger(LogLevel logLevel = LogLevel.Debug)
        {
            _logLevel = logLevel;
        }

        List<LogEntry> _logEntries = new List<LogEntry>();

        public IDisposable BeginScopeImpl(object state)
        {
            return this;
        }

        public void Dispose()
        {
        }

        public bool IsEnabled(LogLevel logLevel)
        {
            return (logLevel >= _logLevel);
        }

        public void Log(LogLevel logLevel, int eventId, object state, Exception exception, Func<object, Exception, string> formatter)
        {
            if (IsEnabled(logLevel))
            {                
                var logEntry =
                    new LogEntry
                    {
                        EventId = eventId,
                        Exception = exception,
                        Formatter = formatter,
                        Level = logLevel,
                        State = state,
                    };

                _logEntries.Add(logEntry);
                Debug.WriteLine(logEntry.ToString());
            }
        }

        public List<LogEntry> Logs { get { return _logEntries; } }
    }
}