Logging: Add ClearOldLogfiles to remove logfiles older than x, Add ModuleName to create subloggers with separate logfiles

2021-05-17 14:34:41 +02:00
parent f50fbe7099
commit 9e7c840579
4 changed files with 188 additions and 53 deletions
--- a/Modules.Logging/LogConfig.vb
+++ b/Modules.Logging/LogConfig.vb
@@ -71,9 +71,9 @@ Public Class LogConfig
    Private Const MAX_ARCHIVE_FILES_DEBUG_DETAIL As Integer = 0
    Private Const ARCHIVE_EVERY As FileArchivePeriod = FileArchivePeriod.Day

-    Private Const FILE_NAME_FORMAT_DEFAULT As String = "${shortdate}-${var:product}${var:suffix}.log"
-    Private Const FILE_NAME_FORMAT_DEBUG As String = "${shortdate}-${var:product}${var:suffix}-Debug.log"
-    Private Const FILE_NAME_FORMAT_ERROR As String = "${shortdate}-${var:product}${var:suffix}-Error.log"
+    Private Const FILE_NAME_FORMAT_DEFAULT As String = "${shortdate}-${var:product}${var:suffix}${event-properties:item=ModuleName}.log"
+    Private Const FILE_NAME_FORMAT_DEBUG As String = "${shortdate}-${var:product}${var:suffix}${event-properties:item=ModuleName}-Debug.log"
+    Private Const FILE_NAME_FORMAT_ERROR As String = "${shortdate}-${var:product}${var:suffix}${event-properties:item=ModuleName}-Error.log"

    Private Const TARGET_DEFAULT As String = "defaultTarget"
    Private Const TARGET_ERROR_EX As String = "errorExceptionTarget"
@@ -93,11 +93,14 @@ Public Class LogConfig
    Private Const FILE_NAME_ACCESS_TEST = "accessTest.txt"
    Private Const FOLDER_NAME_LOG = "Log"

-    Private ReadOnly failSafePath As String = Path.GetTempPath()
-    Private ReadOnly basePath As String = failSafePath
+    Private Const FILE_KEEP_RANGE As Integer = 90
+
+    Private ReadOnly _failSafePath As String = Path.GetTempPath()
+    Private ReadOnly _basePath As String = _failSafePath
+
+    Private _config As LoggingConfiguration
+    Private _isDebug As Boolean = False

-    Private config As LoggingConfiguration
-    Private isDebug As Boolean = False
 #End Region
 #Region "Public Properties"
    Public Enum PathType As Integer
@@ -131,11 +134,10 @@ Public Class LogConfig
    ''' <returns>True, if debug log will be written. False otherwise.</returns>
    Public Property Debug As Boolean
        Get
-            Return isDebug
+            Return _isDebug
        End Get
        Set(isDebug As Boolean)
-            Me.isDebug = isDebug
-            'GetLogger().Debug("=> Debug is now {0}", isDebug)
+            _isDebug = isDebug
            ReloadConfig(isDebug)
        End Set
    End Property
@@ -147,19 +149,27 @@ Public Class LogConfig
    ''' <returns>A list of log messages</returns>
    Public ReadOnly Property Logs As List(Of String)
        Get
-            Dim oTarget = config.FindTargetByName(Of MemoryTarget)(TARGET_MEMORY)
+            Dim oTarget = _config.FindTargetByName(Of MemoryTarget)(TARGET_MEMORY)
            Return oTarget?.Logs.ToList()
        End Get
    End Property

    Public ReadOnly Property NLogConfig As LoggingConfiguration
        Get
-            Return config
+            Return _config
        End Get
    End Property

 #End Region

+    ''' <summary>
+    ''' Initializes a new LogConfig object with the options supplied as a LogOptions object
+    ''' </summary>
+    ''' <param name="Options"></param>
+    Public Sub New(Options As LogOptions)
+        MyClass.New(Options.LogPath, Options.CustomLogPath, Options.Suffix, Options.CompanyName, Options.ProductName, Options.FileKeepInterval)
+    End Sub
+
    ''' <summary>
    ''' Initializes a new LogConfig object with a logpath and optinally a filename-suffix.
    ''' </summary>
@@ -168,11 +178,13 @@ Public Class LogConfig
    ''' <param name="Suffix">If set to anything other than Nothing, extends the logfile name with this suffix.</param>
    ''' <param name="CompanyName">CompanyName is used to construct log-path in when LogPath is set to PathType:AppData</param>
    ''' <param name="ProductName">ProductName is used to construct log-path in when LogPath is set to PathType:AppData</param>
+    ''' <param name="FileKeepRangeInDays">Amount of days where files are kept and not deleted.</param>
    Public Sub New(LogPath As PathType,
                  Optional CustomLogPath As String = Nothing,
                  Optional Suffix As String = Nothing,
                  Optional CompanyName As String = Nothing,
-                  Optional ProductName As String = Nothing)
+                  Optional ProductName As String = Nothing,
+                  Optional FileKeepRangeInDays As Integer = FILE_KEEP_RANGE)

        If LogPath = PathType.AppData And (ProductName Is Nothing Or CompanyName Is Nothing) Then
            Throw New ArgumentException("Modules.Logging: PathType is AppData and either CompanyName or ProductName was not supplied!")
@@ -184,26 +196,26 @@ Public Class LogConfig

        If LogPath = PathType.AppData Then
            Dim appDataDir = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData)
-            basePath = Path.Combine(appDataDir, CompanyName, ProductName, FOLDER_NAME_LOG)
+            _basePath = Path.Combine(appDataDir, CompanyName, ProductName, FOLDER_NAME_LOG)
        ElseIf LogPath = PathType.Temp Then
-            basePath = failSafePath
+            _basePath = _failSafePath
        Else 'Custom Path
-            basePath = CustomLogPath
+            _basePath = CustomLogPath
        End If

        ' If directory does not exist, try to create it!
-        If Not Directory.Exists(basePath) Then
+        If Not Directory.Exists(_basePath) Then
            Try
-                Directory.CreateDirectory(basePath)
+                Directory.CreateDirectory(_basePath)
            Catch ex As Exception
                ' If creation fails, use failSafe path
-                basePath = failSafePath
+                _basePath = _failSafePath
            End Try
        End If

        ' Try to create a file in `basePath` to check write permissions
        Try
-            Dim fileAccessPath = Path.Combine(basePath, FILE_NAME_ACCESS_TEST)
+            Dim fileAccessPath = Path.Combine(_basePath, FILE_NAME_ACCESS_TEST)
            Using fs As FileStream = File.Create(fileAccessPath)
                fs.WriteByte(0)
            End Using
@@ -211,7 +223,7 @@ Public Class LogConfig
            File.Delete(fileAccessPath)
        Catch ex As Exception
            ' If creation fails, use failSafe path
-            basePath = failSafePath
+            _basePath = _failSafePath
        End Try

        ' Set the suffix to the given string if it exists
@@ -228,30 +240,69 @@ Public Class LogConfig
        End If

        ' Create config object and initalize it
-        config = GetConfig(oProductName, logFileSuffix)
+        _config = GetConfig(oProductName, logFileSuffix)

        ' Save config
        LogFactory = New LogFactory With {
-            .Configuration = config
+            .Configuration = _config
        }

        ' Save log paths for files/directory
-        LogDirectory = basePath
+        LogDirectory = _basePath
        LogFile = GetCurrentLogFilePath()
+
+        ' Clear old Logfiles as defined in `FileKeepInterval`
+        ClearOldLogfiles(FileKeepRangeInDays)
    End Sub

-    Private Sub CheckMyApplication()
-        Dim oAssembly = Assembly.GetEntryAssembly()
-        Dim oMyApp = Nothing
-        For Each oType As Type In oAssembly.DefinedTypes
-            If oType.Name = "MyApplication" Then
-                oMyApp = oType
-                Exit For
+    ''' <summary>
+    ''' Clears old LogFiles from the configured logpath for compliance with the GDPR
+    ''' </summary>
+    ''' <param name="FileKeepRange">Days in which logfiles should be kept. All files older than `Now - FileKeepInterval` will be deleted.</param>
+    ''' <returns>True, if files were deleted as expected or no files were deleted. Otherwise false.</returns>
+    Private Function ClearOldLogfiles(FileKeepRange As Integer) As Boolean
+        Dim oClassName As String = GetClassFullName()
+        Dim oLogger As Logger = GetLogger(oClassName)
+
+        Try
+            Dim oContinueOnError = True
+            Dim oUnableToDeleteCounter = 0
+            Dim oDirectory As New DirectoryInfo(LogDirectory)
+            Dim oDateLimit As Date = Date.Now.AddDays(-FileKeepRange)
+            Dim oFiles As List(Of FileInfo) = oDirectory.
+                EnumerateFiles().
+                Where(Function(oFileInfo As FileInfo) oFileInfo.Extension = ".log" And oFileInfo.LastWriteTime < oDateLimit).
+                ToList()
+
+            If oFiles.Count = 0 Then
+                oLogger.Info("No logfiles were marked for deletion in the range [last {0} days].", FileKeepRange)
+                Return True
            End If
-        Next

-        oMyApp.GetType().GetProperty("")
-    End Sub
+            oLogger.Info("Deleting [{0}] old logfiles that are marked for deletion in the range [last {1} days].", oFiles.Count, FileKeepRange)
+
+            For Each oFile As FileInfo In oFiles
+                Try
+                    oFile.Delete()
+                Catch ex As Exception
+                    oUnableToDeleteCounter += 1
+                    oLogger.Warn("File {0} could not be deleted!")
+                End Try
+            Next
+
+            If oUnableToDeleteCounter > 0 Then
+                oLogger.Info("Delete old logfiles partially. {0} files could not be deleted.", oUnableToDeleteCounter)
+            Else
+                oLogger.Info("Deleted [{0}] old logfiles.", oFiles.Count)
+            End If
+
+            Return True
+        Catch ex As Exception
+            oLogger.Error(ex)
+
+            Return False
+        End Try
+    End Function

    ''' <summary>
    ''' Returns the Logger for the calling class
@@ -260,7 +311,25 @@ Public Class LogConfig
    <DebuggerStepThrough()>
    Public Function GetLogger() As Logger
        Dim oClassName As String = GetClassFullName()
-        Return LogFactory.GetLogger(Of Logger)(oClassName)
+        Return GetLogger(oClassName, String.Empty)
+    End Function
+
+    ''' <summary>
+    ''' Returns the Logger for the specified classname
+    ''' </summary>
+    ''' <returns>An object of Logging.Logger</returns>
+    <DebuggerStepThrough()>
+    Public Function GetLogger(ClassName As String) As Logger
+        Return GetLogger(ClassName, String.Empty)
+    End Function
+
+    ''' <summary>
+    ''' Returns the Logger for the specified module
+    ''' </summary>
+    ''' <returns>An object of Logging.Logger</returns>
+    Public Function GetLoggerWithModule(ModuleName As String) As Logger
+        Dim oClassName As String = GetClassFullName()
+        Return GetLogger(oClassName, ModuleName)
    End Function

    ''' <summary>
@@ -269,15 +338,17 @@ Public Class LogConfig
    ''' <param name="ClassName">The name of the class the logger belongs to</param>
    ''' <returns>An object of Logging.Logger</returns>
    <DebuggerStepThrough()>
-    Public Function GetLogger(ClassName As String) As Logger
-        Return LogFactory.GetLogger(Of Logger)(ClassName)
+    Public Function GetLogger(ClassName As String, ModuleName As String) As Logger
+        Dim oLogger = LogFactory.GetLogger(Of Logger)(ClassName)
+        oLogger.ModuleName = ModuleName
+        Return oLogger
    End Function

    ''' <summary>
    ''' Clears the internal log
    ''' </summary>
    Public Sub ClearLogs()
-        Dim oTarget = config.FindTargetByName(Of MemoryTarget)(TARGET_MEMORY)
+        Dim oTarget = _config.FindTargetByName(Of MemoryTarget)(TARGET_MEMORY)
        oTarget?.Logs.Clear()
    End Sub

@@ -336,21 +407,21 @@ Public Class LogConfig
    ''' <param name="logFileSuffix">The chosen suffix</param>
    ''' <returns>A NLog.LoggingConfiguration object</returns>
    Private Function GetConfig(productName As String, logFileSuffix As String) As LoggingConfiguration
-        config = New LoggingConfiguration()
-        config.Variables("product") = productName
-        config.Variables("suffix") = logFileSuffix
+        _config = New LoggingConfiguration()
+        _config.Variables("product") = productName
+        _config.Variables("suffix") = logFileSuffix

        ' Add default targets
-        config.AddTarget(TARGET_ERROR_EX, GetErrorExceptionLogTarget(basePath))
-        config.AddTarget(TARGET_ERROR, GetErrorLogTarget(basePath))
-        config.AddTarget(TARGET_DEFAULT, GetDefaultLogTarget(basePath))
-        config.AddTarget(TARGET_DEBUG, GetDebugLogTarget(basePath))
-        config.AddTarget(TARGET_MEMORY, GetMemoryDebugTarget())
+        _config.AddTarget(TARGET_ERROR_EX, GetErrorExceptionLogTarget(_basePath))
+        _config.AddTarget(TARGET_ERROR, GetErrorLogTarget(_basePath))
+        _config.AddTarget(TARGET_DEFAULT, GetDefaultLogTarget(_basePath))
+        _config.AddTarget(TARGET_DEBUG, GetDebugLogTarget(_basePath))
+        _config.AddTarget(TARGET_MEMORY, GetMemoryDebugTarget())

        ' Add default rules
-        AddDefaultRules(config)
+        AddDefaultRules(_config)

-        Return config
+        Return _config
    End Function

    ''' <summary>
@@ -371,7 +442,7 @@ Public Class LogConfig
    ''' <returns>Full path of the current default log file</returns>
    Private Function GetCurrentLogFilePath()
        Dim logEventInfo As New LogEventInfo() With {.TimeStamp = Date.Now}
-        Dim target As FileTarget = config.FindTargetByName(TARGET_DEFAULT)
+        Dim target As FileTarget = _config.FindTargetByName(TARGET_DEFAULT)
        Dim fileName As String = target.FileName.Render(logEventInfo)

        Return fileName
@@ -383,15 +454,15 @@ Public Class LogConfig
    ''' <param name="Debug">Adds the Debug rule if true.</param>
    Private Sub ReloadConfig(Optional Debug As Boolean = False)
        ' Clear Logging Rules
-        config.LoggingRules.Clear()
+        _config.LoggingRules.Clear()

        ' Add default rules
-        AddDefaultRules(config)
+        AddDefaultRules(_config)

        ' Add debug rule, if configured
        If Debug Then
-            config.AddRuleForAllLevels(TARGET_DEBUG)
-            config.AddRuleForAllLevels(TARGET_MEMORY)
+            _config.AddRuleForAllLevels(TARGET_DEBUG)
+            _config.AddRuleForAllLevels(TARGET_MEMORY)
        End If

        ' Reload all running loggers