From a88ce6495185e7e63c5c1362c7e3f8660b89333d Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Thu, 5 Mar 2020 23:27:41 +0800
Subject: Migrate avatar service. TODO: Migrate database.

---
 Timeline/Entities/UserAvatarEntity.cs              |   7 +-
 .../Resources/Services/DataManager.Designer.cs     |  72 ++++++++++++
 Timeline/Resources/Services/DataManager.resx       | 123 +++++++++++++++++++++
 Timeline/Services/DataManager.cs                   |   2 +-
 Timeline/Services/UserAvatarService.cs             |  43 +++----
 Timeline/Timeline.csproj                           |   9 ++
 6 files changed, 230 insertions(+), 26 deletions(-)
 create mode 100644 Timeline/Resources/Services/DataManager.Designer.cs
 create mode 100644 Timeline/Resources/Services/DataManager.resx

diff --git a/Timeline/Entities/UserAvatarEntity.cs b/Timeline/Entities/UserAvatarEntity.cs
index be094a77..3c2720f7 100644
--- a/Timeline/Entities/UserAvatarEntity.cs
+++ b/Timeline/Entities/UserAvatarEntity.cs
@@ -11,15 +11,12 @@ namespace Timeline.Entities
         [Column("id"), Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)]
         public long Id { get; set; }
 
-        [Column("data")]
-        public byte[]? Data { get; set; }
+        [Column("data_tag")]
+        public string? DataTag { get; set; }
 
         [Column("type")]
         public string? Type { get; set; }
 
-        [Column("etag")]
-        public string? ETag { get; set; }
-
         [Column("last_modified"), Required]
         public DateTime LastModified { get; set; }
 
diff --git a/Timeline/Resources/Services/DataManager.Designer.cs b/Timeline/Resources/Services/DataManager.Designer.cs
new file mode 100644
index 00000000..0872059a
--- /dev/null
+++ b/Timeline/Resources/Services/DataManager.Designer.cs
@@ -0,0 +1,72 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//     Runtime Version:4.0.30319.42000
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+namespace Timeline.Resources.Services {
+    using System;
+    
+    
+    /// <summary>
+    ///   A strongly-typed resource class, for looking up localized strings, etc.
+    /// </summary>
+    // This class was auto-generated by the StronglyTypedResourceBuilder
+    // class via a tool like ResGen or Visual Studio.
+    // To add or remove a member, edit your .ResX file then rerun ResGen
+    // with the /str option, or rebuild your VS project.
+    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("System.Resources.Tools.StronglyTypedResourceBuilder", "16.0.0.0")]
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+    [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+    internal class DataManager {
+        
+        private static global::System.Resources.ResourceManager resourceMan;
+        
+        private static global::System.Globalization.CultureInfo resourceCulture;
+        
+        [global::System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
+        internal DataManager() {
+        }
+        
+        /// <summary>
+        ///   Returns the cached ResourceManager instance used by this class.
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static global::System.Resources.ResourceManager ResourceManager {
+            get {
+                if (object.ReferenceEquals(resourceMan, null)) {
+                    global::System.Resources.ResourceManager temp = new global::System.Resources.ResourceManager("Timeline.Resources.Services.DataManager", typeof(DataManager).Assembly);
+                    resourceMan = temp;
+                }
+                return resourceMan;
+            }
+        }
+        
+        /// <summary>
+        ///   Overrides the current thread's CurrentUICulture property for all
+        ///   resource lookups using this strongly typed resource class.
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static global::System.Globalization.CultureInfo Culture {
+            get {
+                return resourceCulture;
+            }
+            set {
+                resourceCulture = value;
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to Entry with given tag does not exist..
+        /// </summary>
+        internal static string ExceptionEntryNotExist {
+            get {
+                return ResourceManager.GetString("ExceptionEntryNotExist", resourceCulture);
+            }
+        }
+    }
+}
diff --git a/Timeline/Resources/Services/DataManager.resx b/Timeline/Resources/Services/DataManager.resx
new file mode 100644
index 00000000..688e0e96
--- /dev/null
+++ b/Timeline/Resources/Services/DataManager.resx
@@ -0,0 +1,123 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <data name="ExceptionEntryNotExist" xml:space="preserve">
+    <value>Entry with given tag does not exist.</value>
+  </data>
+</root>
\ No newline at end of file
diff --git a/Timeline/Services/DataManager.cs b/Timeline/Services/DataManager.cs
index 66aa6f81..d6b8b6a4 100644
--- a/Timeline/Services/DataManager.cs
+++ b/Timeline/Services/DataManager.cs
@@ -115,7 +115,7 @@ namespace Timeline.Services
             var entity = await _database.Data.Where(d => d.Tag == tag).Select(d => new { d.Data }).SingleOrDefaultAsync();
 
             if (entity == null)
-                throw new InvalidOperationException("Entry with given tag does not exist.");
+                throw new InvalidOperationException(Resources.Services.DataManager.ExceptionEntryNotExist);
 
             return entity.Data;
         }
diff --git a/Timeline/Services/UserAvatarService.cs b/Timeline/Services/UserAvatarService.cs
index 39b408e6..5a07da96 100644
--- a/Timeline/Services/UserAvatarService.cs
+++ b/Timeline/Services/UserAvatarService.cs
@@ -164,7 +164,7 @@ namespace Timeline.Services
         private readonly IDefaultUserAvatarProvider _defaultUserAvatarProvider;
         private readonly IUserAvatarValidator _avatarValidator;
 
-        private readonly IETagGenerator _eTagGenerator;
+        private readonly IDataManager _dataManager;
 
         private readonly IClock _clock;
 
@@ -173,20 +173,20 @@ namespace Timeline.Services
             DatabaseContext database,
             IDefaultUserAvatarProvider defaultUserAvatarProvider,
             IUserAvatarValidator avatarValidator,
-            IETagGenerator eTagGenerator,
+            IDataManager dataManager,
             IClock clock)
         {
             _logger = logger;
             _database = database;
             _defaultUserAvatarProvider = defaultUserAvatarProvider;
             _avatarValidator = avatarValidator;
-            _eTagGenerator = eTagGenerator;
+            _dataManager = dataManager;
             _clock = clock;
         }
 
         public async Task<string> GetAvatarETag(long id)
         {
-            var eTag = (await _database.UserAvatars.Where(a => a.UserId == id).Select(a => new { a.ETag }).SingleOrDefaultAsync())?.ETag;
+            var eTag = (await _database.UserAvatars.Where(a => a.UserId == id).Select(a => new { a.DataTag }).SingleOrDefaultAsync())?.DataTag;
             if (eTag == null)
                 return await _defaultUserAvatarProvider.GetDefaultAvatarETag();
             else
@@ -195,25 +195,27 @@ namespace Timeline.Services
 
         public async Task<AvatarInfo> GetAvatar(long id)
         {
-            var avatarEntity = await _database.UserAvatars.Where(a => a.UserId == id).Select(a => new { a.Type, a.Data, a.LastModified }).SingleOrDefaultAsync();
+            var avatarEntity = await _database.UserAvatars.Where(a => a.UserId == id).Select(a => new { a.Type, a.DataTag, a.LastModified }).SingleOrDefaultAsync();
 
             if (avatarEntity != null)
             {
-                if (!LanguageHelper.AreSame(avatarEntity.Data == null, avatarEntity.Type == null))
+                if (!LanguageHelper.AreSame(avatarEntity.DataTag == null, avatarEntity.Type == null))
                 {
                     var message = Resources.Services.UserAvatarService.ExceptionDatabaseCorruptedDataAndTypeNotSame;
                     _logger.LogCritical(message);
                     throw new DatabaseCorruptedException(message);
                 }
 
-                if (avatarEntity.Data != null)
+
+                if (avatarEntity.DataTag != null)
                 {
+                    var data = await _dataManager.GetEntry(avatarEntity.DataTag);
                     return new AvatarInfo
                     {
                         Avatar = new Avatar
                         {
                             Type = avatarEntity.Type!,
-                            Data = avatarEntity.Data
+                            Data = data
                         },
                         LastModified = avatarEntity.LastModified
                     };
@@ -239,15 +241,15 @@ namespace Timeline.Services
 
             if (avatar == null)
             {
-                if (avatarEntity == null || avatarEntity.Data == null)
+                if (avatarEntity == null || avatarEntity.DataTag == null)
                 {
                     return;
                 }
                 else
                 {
-                    avatarEntity.Data = null;
+                    await _dataManager.FreeEntry(avatarEntity.DataTag);
+                    avatarEntity.DataTag = null;
                     avatarEntity.Type = null;
-                    avatarEntity.ETag = null;
                     avatarEntity.LastModified = _clock.GetCurrentTime();
                     await _database.SaveChangesAsync();
                     _logger.LogInformation(Resources.Services.UserAvatarService.LogUpdateEntity);
@@ -256,24 +258,26 @@ namespace Timeline.Services
             else
             {
                 await _avatarValidator.Validate(avatar);
+                var oldTag = avatarEntity?.DataTag;
                 var create = avatarEntity == null;
-                if (create)
+                if (avatarEntity == null)
                 {
                     avatarEntity = new UserAvatarEntity();
+                    _database.UserAvatars.Add(avatarEntity);
                 }
-                avatarEntity!.Type = avatar.Type;
-                avatarEntity.Data = avatar.Data;
-                avatarEntity.ETag = await _eTagGenerator.Generate(avatar.Data);
+                var tag = await _dataManager.RetainEntry(avatar.Data);
+                avatarEntity.DataTag = tag;
+                avatarEntity.Type = avatar.Type;
                 avatarEntity.LastModified = _clock.GetCurrentTime();
                 avatarEntity.UserId = id;
-                if (create)
-                {
-                    _database.UserAvatars.Add(avatarEntity);
-                }
                 await _database.SaveChangesAsync();
                 _logger.LogInformation(create ?
                     Resources.Services.UserAvatarService.LogCreateEntity
                     : Resources.Services.UserAvatarService.LogUpdateEntity);
+                if (oldTag != null)
+                {
+                    await _dataManager.FreeEntry(oldTag);
+                }
             }
         }
     }
@@ -282,7 +286,6 @@ namespace Timeline.Services
     {
         public static void AddUserAvatarService(this IServiceCollection services)
         {
-            services.TryAddTransient<IETagGenerator, ETagGenerator>();
             services.AddScoped<IUserAvatarService, UserAvatarService>();
             services.AddSingleton<IDefaultUserAvatarProvider, DefaultUserAvatarProvider>();
             services.AddTransient<IUserAvatarValidator, UserAvatarValidator>();
diff --git a/Timeline/Timeline.csproj b/Timeline/Timeline.csproj
index 2dcc3c9f..72bc1572 100644
--- a/Timeline/Timeline.csproj
+++ b/Timeline/Timeline.csproj
@@ -97,6 +97,11 @@
             <AutoGen>True</AutoGen>
             <DependentUpon>Validator.resx</DependentUpon>
         </Compile>
+        <Compile Update="Resources\Services\DataManager.Designer.cs">
+          <DesignTime>True</DesignTime>
+          <AutoGen>True</AutoGen>
+          <DependentUpon>DataManager.resx</DependentUpon>
+        </Compile>
         <Compile Update="Resources\Services\Exception.Designer.cs">
             <DesignTime>True</DesignTime>
             <AutoGen>True</AutoGen>
@@ -174,6 +179,10 @@
             <Generator>ResXFileCodeGenerator</Generator>
             <LastGenOutput>Validator.Designer.cs</LastGenOutput>
         </EmbeddedResource>
+        <EmbeddedResource Update="Resources\Services\DataManager.resx">
+          <Generator>ResXFileCodeGenerator</Generator>
+          <LastGenOutput>DataManager.Designer.cs</LastGenOutput>
+        </EmbeddedResource>
         <EmbeddedResource Update="Resources\Services\Exception.resx">
             <Generator>ResXFileCodeGenerator</Generator>
             <LastGenOutput>Exception.Designer.cs</LastGenOutput>
-- 
cgit v1.2.3