Add Microsoft.Extensions.Logging provider. Fixes #418

Author: bgrainger

MySqlConnector.sln

@@ -1,6 +1,6 @@
 Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio 15
-VisualStudioVersion = 15.0.27004.2010
+VisualStudioVersion = 15.0.27130.2010
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "MySqlConnector", "src\MySqlConnector\MySqlConnector.csproj", "{F82378AF-274E-4FBA-8E45-27126D607B85}"
 EndProject
@@ -14,6 +14,8 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Conformance.Tests", "tests\
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "MySqlConnector.Logging.log4net", "src\MySqlConnector.Logging.log4net\MySqlConnector.Logging.log4net.csproj", "{A15647B8-FA3F-4536-BF4E-4F93F2FBFC75}"
 EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "MySqlConnector.Logging.Microsoft.Extensions.Logging", "src\MySqlConnector.Logging.Microsoft.Extensions.Logging\MySqlConnector.Logging.Microsoft.Extensions.Logging.csproj", "{6A3F1732-F874-463E-9BB8-21690E7B8ED0}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -44,6 +46,10 @@ Global
 		{A15647B8-FA3F-4536-BF4E-4F93F2FBFC75}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{A15647B8-FA3F-4536-BF4E-4F93F2FBFC75}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{A15647B8-FA3F-4536-BF4E-4F93F2FBFC75}.Release|Any CPU.Build.0 = Release|Any CPU
+		{6A3F1732-F874-463E-9BB8-21690E7B8ED0}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{6A3F1732-F874-463E-9BB8-21690E7B8ED0}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{6A3F1732-F874-463E-9BB8-21690E7B8ED0}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{6A3F1732-F874-463E-9BB8-21690E7B8ED0}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

appveyor.yml

@@ -13,6 +13,7 @@ after_test:
 - cmd: |-
     dotnet pack src\MySqlConnector\MySqlConnector.csproj -c Release -p:SourceLinkCreate=true -p:SourceLinkTest=true
     dotnet pack src\MySqlConnector.Logging.log4net\MySqlConnector.Logging.log4net.csproj -c Release -p:SourceLinkCreate=true -p:SourceLinkTest=true
+    dotnet pack src\MySqlConnector.Logging.Microsoft.Extensions.Logging\MySqlConnector.Logging.Microsoft.Extensions.Logging.csproj -c Release -p:SourceLinkCreate=true -p:SourceLinkTest=true
 notifications:
 - provider: Slack
   incoming_webhook:

src/MySqlConnector.Logging.Microsoft.Extensions.Logging/MicrosoftExtensionsLoggingLoggerProvider.cs

@@ -0,0 +1,56 @@
+using System;
+using System.Globalization;
+using Microsoft.Extensions.Logging;
+
+namespace MySqlConnector.Logging
+{
+	public sealed class MicrosoftExtensionsLoggingLoggerProvider : IMySqlConnectorLoggerProvider
+	{
+		public MicrosoftExtensionsLoggingLoggerProvider(ILoggerFactory loggerFactory) => m_loggerFactory = loggerFactory;
+
+		public IMySqlConnectorLogger CreateLogger(string name) => new MicrosoftExtensionsLoggingLogger(m_loggerFactory.CreateLogger(name));
+
+		private class MicrosoftExtensionsLoggingLogger : IMySqlConnectorLogger
+		{
+			public MicrosoftExtensionsLoggingLogger(ILogger logger) => m_logger = logger;
+
+			public bool IsEnabled(MySqlConnectorLogLevel level) => m_logger.IsEnabled(GetLevel(level));
+
+			public void Log(MySqlConnectorLogLevel level, string message, object[] args = null, Exception exception = null)
+			{
+				if (args == null || args.Length == 0)
+					m_logger.Log(GetLevel(level), 0, message, exception, s_getMessage);
+				else
+					m_logger.Log(GetLevel(level), 0, (message, args), exception, s_messageFormatter);
+			}
+
+			private static LogLevel GetLevel(MySqlConnectorLogLevel level)
+			{
+				switch (level)
+				{
+				case MySqlConnectorLogLevel.Trace:
+					return LogLevel.Trace;
+				case MySqlConnectorLogLevel.Debug:
+					return LogLevel.Debug;
+				case MySqlConnectorLogLevel.Info:
+					return LogLevel.Information;
+				case MySqlConnectorLogLevel.Warn:
+					return LogLevel.Warning;
+				case MySqlConnectorLogLevel.Error:
+					return LogLevel.Error;
+				case MySqlConnectorLogLevel.Fatal:
+					return LogLevel.Critical;
+				default:
+					throw new ArgumentOutOfRangeException(nameof(level), level, "Invalid value for 'level'.");
+				}
+			}
+
+			static readonly Func<string, Exception, string> s_getMessage = (s, e) => s;
+			static readonly Func<(string Message, object[] Args), Exception, string> s_messageFormatter = (s, e) => string.Format(CultureInfo.InvariantCulture, s.Message, s.Args);
+
+			readonly ILogger m_logger;
+		}
+
+		readonly ILoggerFactory m_loggerFactory;
+	}
+}

src/MySqlConnector.Logging.Microsoft.Extensions.Logging/MySqlConnector.Logging.Microsoft.Extensions.Logging.csproj

@@ -0,0 +1,20 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFrameworks>netstandard2.0</TargetFrameworks>
+    <Title>MySqlConnector Logging Adapter for Microsoft.Extensions.Logging</Title>
+    <Description>Writes MySqlConnector logging output to Microsoft.Extensions.Logging with one line of code.</Description>
+    <Copyright>Copyright 2017 Bradley Grainger</Copyright>
+    <Authors>Bradley Grainger</Authors>
+    <PackageTags>mysql;mysqlconnector;async;ado.net;database;netcore;logging</PackageTags>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.Logging" Version="2.0.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\MySqlConnector\MySqlConnector.csproj" />
+  </ItemGroup>
+
+</Project>