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#region Copyright notice and license
// Copyright 2015 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#endregion
using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using Grpc.Core.Utils;
namespace Grpc.Core.Logging
{
/// <summary>Logger that logs to an arbitrary <c>System.IO.TextWriter</c>.</summary>
public class TextWriterLogger : ILogger
{
// Format similar enough to C core log format except nanosecond precision is not supported.
const string DateTimeFormatString = "MMdd HH:mm:ss.ffffff";
readonly Func<TextWriter> textWriterProvider;
readonly Type forType;
readonly string forTypeString;
/// <summary>
/// Creates a console logger not associated to any specific type and writes to given <c>System.IO.TextWriter</c>.
/// User is responsible for providing an instance of TextWriter that is thread-safe.
/// </summary>
public TextWriterLogger(TextWriter textWriter) : this(() => textWriter)
{
GrpcPreconditions.CheckNotNull(textWriter);
}
/// <summary>
/// Creates a console logger not associated to any specific type and writes to a <c>System.IO.TextWriter</c> obtained from given provider.
/// User is responsible for providing an instance of TextWriter that is thread-safe.
/// </summary>
public TextWriterLogger(Func<TextWriter> textWriterProvider) : this(textWriterProvider, null)
{
}
/// <summary>Creates a console logger that logs messsage specific for given type.</summary>
protected TextWriterLogger(Func<TextWriter> textWriterProvider, Type forType)
{
this.textWriterProvider = GrpcPreconditions.CheckNotNull(textWriterProvider);
this.forType = forType;
if (forType != null)
{
var namespaceStr = forType.Namespace ?? "";
if (namespaceStr.Length > 0)
{
namespaceStr += ".";
}
this.forTypeString = namespaceStr + forType.Name + " ";
}
else
{
this.forTypeString = "";
}
}
/// <summary>
/// Returns a logger associated with the specified type.
/// </summary>
public virtual ILogger ForType<T>()
{
if (typeof(T) == forType)
{
return this;
}
return new TextWriterLogger(this.textWriterProvider, typeof(T));
}
/// <summary>Logs a message with severity Debug.</summary>
public void Debug(string message)
{
Log("D", message);
}
/// <summary>Logs a formatted message with severity Debug.</summary>
public void Debug(string format, params object[] formatArgs)
{
Debug(string.Format(format, formatArgs));
}
/// <summary>Logs a message with severity Info.</summary>
public void Info(string message)
{
Log("I", message);
}
/// <summary>Logs a formatted message with severity Info.</summary>
public void Info(string format, params object[] formatArgs)
{
Info(string.Format(format, formatArgs));
}
/// <summary>Logs a message with severity Warning.</summary>
public void Warning(string message)
{
Log("W", message);
}
/// <summary>Logs a formatted message with severity Warning.</summary>
public void Warning(string format, params object[] formatArgs)
{
Warning(string.Format(format, formatArgs));
}
/// <summary>Logs a message and an associated exception with severity Warning.</summary>
public void Warning(Exception exception, string message)
{
Warning(message + " " + exception);
}
/// <summary>Logs a message with severity Error.</summary>
public void Error(string message)
{
Log("E", message);
}
/// <summary>Logs a formatted message with severity Error.</summary>
public void Error(string format, params object[] formatArgs)
{
Error(string.Format(format, formatArgs));
}
/// <summary>Logs a message and an associated exception with severity Error.</summary>
public void Error(Exception exception, string message)
{
Error(message + " " + exception);
}
/// <summary>Gets the type associated with this logger.</summary>
protected Type AssociatedType
{
get { return forType; }
}
private void Log(string severityString, string message)
{
textWriterProvider().WriteLine("{0}{1} {2}{3}",
severityString,
DateTime.Now.ToString(DateTimeFormatString, CultureInfo.InvariantCulture),
forTypeString,
message);
}
}
}
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