perf(blog): cache users

OliverBooth/Controllers/Blog/RssController.cs

@@ -1,32 +1,39 @@
-using System.Diagnostics.CodeAnalysis;
-using System.Xml.Serialization;
+using System.Xml.Serialization;
+using Microsoft.AspNetCore.Mvc;
 using OliverBooth.Data.Blog;
 using OliverBooth.Data.Blog.Rss;
 using OliverBooth.Services;
 
-namespace OliverBooth.Middleware;
+namespace OliverBooth.Controllers.Blog;
 
-internal sealed class RssMiddleware
+[ApiController]
+[Route("blog/feed")]
+public class RssController : Controller
 {
     private readonly IBlogPostService _blogPostService;
 
-    public RssMiddleware(RequestDelegate _, IBlogPostService blogPostService)
+    /// <summary>
+    ///     Initializes a new instance of the <see cref="RssController" /> class.
+    /// </summary>
+    /// <param name="blogPostService">The <see cref="IBlogPostService" />.</param>
+    public RssController(IBlogPostService blogPostService)
     {
         _blogPostService = blogPostService;
     }
 
-    [SuppressMessage("Performance", "CA1822:Mark members as static", Justification = "Middleware")]
-    public async Task Invoke(HttpContext context)
+    [HttpGet]
+    [Produces("application/rss+xml")]
+    public IActionResult OnGet()
     {
-        context.Response.ContentType = "application/rss+xml";
+        Response.ContentType = "application/rss+xml";
 
-        var baseUrl = $"https://{context.Request.Host}/blog";
+        var baseUrl = $"https://{Request.Host}/blog";
         var blogItems = new List<BlogItem>();
 
         foreach (IBlogPost post in _blogPostService.GetAllBlogPosts())
         {
             var url = $"{baseUrl}/{post.Published:yyyy/MM/dd}/{post.Slug}";
-            string excerpt = _blogPostService.RenderExcerpt(post, out _);
+            string excerpt = _blogPostService.RenderPost(post);
             var description = $"{excerpt}<p><a href=\"{url}\">Read more...</a></p>";
 
             var item = new BlogItem
@@ -36,7 +43,7 @@ internal sealed class RssMiddleware
                 Comments = $"{url}#disqus_thread",
                 Creator = post.Author.DisplayName,
                 PubDate = post.Published.ToString("R"),
-                Guid = $"{baseUrl}?pid={post.Id}",
+                Guid = post.WordPressId.HasValue ? $"{baseUrl}?p={post.WordPressId.Value}" : $"{baseUrl}?pid={post.Id}",
                 Description = description
             };
             blogItems.Add(item);
@@ -68,7 +75,9 @@ internal sealed class RssMiddleware
         xmlNamespaces.Add("sy", "http://purl.org/rss/1.0/modules/syndication/");
         xmlNamespaces.Add("slash", "http://purl.org/rss/1.0/modules/slash/");
 
-        await using var writer = new StreamWriter(context.Response.BodyWriter.AsStream());
+        using var writer = new StreamWriter(Response.BodyWriter.AsStream());
         serializer.Serialize(writer, rss, xmlNamespaces);
+
+        return Ok();
     }
 }

OliverBooth/Data/Blog/BlogContext.cs

@@ -25,12 +25,6 @@ internal sealed class BlogContext : DbContext
     /// <value>The collection of blog posts.</value>
     public DbSet<BlogPost> BlogPosts { get; private set; } = null!;
 
-    /// <summary>
-    ///     Gets the collection of templates in the database.
-    /// </summary>
-    /// <value>The collection of templates.</value>
-    public DbSet<Template> Templates { get; private set; } = null!;
-
     /// <summary>
     ///     Gets the collection of users in the database.
     /// </summary>
@@ -49,7 +43,6 @@ internal sealed class BlogContext : DbContext
     protected override void OnModelCreating(ModelBuilder modelBuilder)
     {
         modelBuilder.ApplyConfiguration(new BlogPostConfiguration());
-        modelBuilder.ApplyConfiguration(new TemplateConfiguration());
         modelBuilder.ApplyConfiguration(new UserConfiguration());
     }
 }

OliverBooth/Data/Blog/BlogPost.cs

@@ -37,6 +37,9 @@ internal sealed class BlogPost : IBlogPost
     /// <inheritdoc />
     public DateTimeOffset? Updated { get; internal set; }
 
+    /// <inheritdoc />
+    public int? WordPressId { get; set; }
+
     /// <summary>
     ///     Gets or sets the ID of the author of this blog post.
     /// </summary>
@@ -61,12 +64,6 @@ internal sealed class BlogPost : IBlogPost
     /// <value>The Disqus URL path.</value>
     internal string? DisqusPath { get; set; }
 
-    /// <summary>
-    ///     Gets or sets the WordPress ID of this blog post.
-    /// </summary>
-    /// <value>The WordPress ID of this blog post.</value>
-    internal int? WordPressId { get; set; }
-
     /// <summary>
     ///     Gets the Disqus domain for the blog post.
     /// </summary>

OliverBooth/Data/Blog/Configuration/TemplateConfiguration.cs

@@ -1,19 +0,0 @@
-using Microsoft.EntityFrameworkCore;
-using Microsoft.EntityFrameworkCore.Metadata.Builders;
-
-namespace OliverBooth.Data.Blog.Configuration;
-
-/// <summary>
-///     Represents the configuration for the <see cref="Template" /> entity.
-/// </summary>
-internal sealed class TemplateConfiguration : IEntityTypeConfiguration<Template>
-{
-    public void Configure(EntityTypeBuilder<Template> builder)
-    {
-        builder.ToTable("Template");
-        builder.HasKey(e => e.Name);
-
-        builder.Property(e => e.Name).IsRequired();
-        builder.Property(e => e.FormatString).IsRequired();
-    }
-}

OliverBooth/Data/Blog/IBlogPost.cs

@@ -69,6 +69,14 @@ public interface IBlogPost
     /// <value>The update date and time, or <see langword="null" /> if the post has not been updated.</value>
     DateTimeOffset? Updated { get; }
 
+    /// <summary>
+    ///     Gets the WordPress ID of the post.
+    /// </summary>
+    /// <value>
+    ///     The WordPress ID of the post, or <see langword="null" /> if the post was not imported from WordPress.
+    /// </value>
+    int? WordPressId { get; }
+
     /// <summary>
     ///     Gets the Disqus identifier for the post.
     /// </summary>

OliverBooth/Data/Blog/Template.cs

@@ -1,74 +0,0 @@
-namespace OliverBooth.Data.Blog;
-
-/// <summary>
-///     Represents a MediaWiki-style template.
-/// </summary>
-public sealed class Template : ITemplate, IEquatable<Template>
-{
-    /// <inheritdoc />
-    public string FormatString { get; internal set; } = string.Empty;
-
-    /// <inheritdoc />
-    public string Name { get; private set; } = string.Empty;
-
-    /// <summary>
-    ///     Returns a value indicating whether two instances of <see cref="Template" /> are equal.
-    /// </summary>
-    /// <param name="left">The first instance of <see cref="Template" /> to compare.</param>
-    /// <param name="right">The second instance of <see cref="Template" /> to compare.</param>
-    /// <returns>
-    ///     <see langword="true" /> if <paramref name="left" /> and <paramref name="right" /> are equal; otherwise,
-    ///     <see langword="false" />.
-    /// </returns>
-    public static bool operator ==(Template? left, Template? right) => Equals(left, right);
-
-    /// <summary>
-    ///     Returns a value indicating whether two instances of <see cref="Template" /> are not equal.
-    /// </summary>
-    /// <param name="left">The first instance of <see cref="Template" /> to compare.</param>
-    /// <param name="right">The second instance of <see cref="Template" /> to compare.</param>
-    /// <returns>
-    ///     <see langword="true" /> if <paramref name="left" /> and <paramref name="right" /> are not equal; otherwise,
-    ///     <see langword="false" />.
-    /// </returns>
-    public static bool operator !=(Template? left, Template? right) => !(left == right);
-
-    /// <summary>
-    ///     Returns a value indicating whether this instance of <see cref="Template" /> is equal to another
-    ///     instance.
-    /// </summary>
-    /// <param name="other">An instance to compare with this instance.</param>
-    /// <returns>
-    ///     <see langword="true" /> if <paramref name="other" /> is equal to this instance; otherwise,
-    ///     <see langword="false" />.
-    /// </returns>
-    public bool Equals(Template? other)
-    {
-        if (ReferenceEquals(null, other)) return false;
-        if (ReferenceEquals(this, other)) return true;
-        return Name == other.Name;
-    }
-
-    /// <summary>
-    ///     Returns a value indicating whether this instance is equal to a specified object.
-    /// </summary>
-    /// <param name="obj">An object to compare with this instance.</param>
-    /// <returns>
-    ///     <see langword="true" /> if <paramref name="obj" /> is an instance of <see cref="Template" /> and
-    ///     equals the value of this instance; otherwise, <see langword="false" />.
-    /// </returns>
-    public override bool Equals(object? obj)
-    {
-        return ReferenceEquals(this, obj) || obj is Template other && Equals(other);
-    }
-
-    /// <summary>
-    ///     Gets the hash code for this instance.
-    /// </summary>
-    /// <returns>The hash code.</returns>
-    public override int GetHashCode()
-    {
-        // ReSharper disable once NonReadonlyMemberInGetHashCode
-        return Name.GetHashCode();
-    }
-}

OliverBooth/Markdown/Template/TemplateRenderer.cs

@@ -23,6 +23,6 @@ internal sealed class TemplateRenderer : HtmlObjectRenderer<TemplateInline>
     /// <inheritdoc />
     protected override void Write(HtmlRenderer renderer, TemplateInline template)
     {
-        renderer.Write(_templateService.RenderTemplate(template));
+        renderer.Write(_templateService.RenderGlobalTemplate(template));
     }
 }

OliverBooth/Middleware/RssEndpointExtensions.cs

@@ -1,13 +0,0 @@
-namespace OliverBooth.Middleware;
-
-internal static class RssEndpointExtensions
-{
-    public static IEndpointConventionBuilder MapRssFeed(this IEndpointRouteBuilder endpoints, string pattern)
-    {
-        RequestDelegate pipeline = endpoints.CreateApplicationBuilder()
-            .UseMiddleware<RssMiddleware>()
-            .Build();
-
-        return endpoints.Map(pattern, pipeline).WithDisplayName("RSS Feed");
-    }
-}

OliverBooth/Services/BlogUserService.cs

@@ -1,3 +1,4 @@
+using System.Collections.Concurrent;
 using System.Diagnostics.CodeAnalysis;
 using Microsoft.EntityFrameworkCore;
 using OliverBooth.Data.Blog;
@@ -10,6 +11,7 @@ namespace OliverBooth.Services;
 internal sealed class BlogUserService : IBlogUserService
 {
     private readonly IDbContextFactory<BlogContext> _dbContextFactory;
+    private readonly ConcurrentDictionary<Guid, IUser> _userCache = new();
 
     /// <summary>
     ///     Initializes a new instance of the <see cref="BlogUserService" /> class.
@@ -25,8 +27,12 @@ internal sealed class BlogUserService : IBlogUserService
     /// <inheritdoc />
     public bool TryGetUser(Guid id, [NotNullWhen(true)] out IUser? user)
     {
+        if (_userCache.TryGetValue(id, out user)) return true;
+
         using BlogContext context = _dbContextFactory.CreateDbContext();
         user = context.Users.Find(id);
+
+        if (user is not null) _userCache.TryAdd(id, user);
         return user is not null;
     }
 }

OliverBooth/Services/ITemplateService.cs

@@ -1,3 +1,4 @@
+using OliverBooth.Data;
 using OliverBooth.Markdown.Template;
 
 namespace OliverBooth.Services;
@@ -8,12 +9,23 @@ namespace OliverBooth.Services;
 public interface ITemplateService
 {
     /// <summary>
-    ///     Renders the specified template with the specified arguments.
+    ///     Renders the specified global template with the specified arguments.
     /// </summary>
-    /// <param name="templateInline">The template to render.</param>
-    /// <returns>The rendered template.</returns>
+    /// <param name="templateInline">The global template to render.</param>
+    /// <returns>The rendered global template.</returns>
     /// <exception cref="ArgumentNullException">
     ///     <paramref name="templateInline" /> is <see langword="null" />.
     /// </exception>
-    string RenderTemplate(TemplateInline templateInline);
+    string RenderGlobalTemplate(TemplateInline templateInline);
+
+    /// <summary>
+    ///     Renders the specified global template with the specified arguments.
+    /// </summary>
+    /// <param name="templateInline">The global template to render.</param>
+    /// <param name="template">The database template object.</param>
+    /// <returns>The rendered global template.</returns>
+    /// <exception cref="ArgumentNullException">
+    ///     <paramref name="templateInline" /> is <see langword="null" />.
+    /// </exception>
+    string RenderTemplate(TemplateInline templateInline, ITemplate? template);
 }

OliverBooth/Services/TemplateService.cs

@@ -1,6 +1,7 @@
 using System.Buffers.Binary;
 using Microsoft.EntityFrameworkCore;
-using OliverBooth.Data.Blog;
+using OliverBooth.Data;
+using OliverBooth.Data.Web;
 using OliverBooth.Formatting;
 using OliverBooth.Markdown.Template;
 using SmartFormat;
@@ -14,15 +15,16 @@ namespace OliverBooth.Services;
 internal sealed class TemplateService : ITemplateService
 {
     private static readonly Random Random = new();
-    private readonly IDbContextFactory<BlogContext> _webContextFactory;
+    private readonly IDbContextFactory<WebContext> _webContextFactory;
     private readonly SmartFormatter _formatter;
 
     /// <summary>
     ///     Initializes a new instance of the <see cref="TemplateService" /> class.
     /// </summary>
     /// <param name="serviceProvider">The <see cref="IServiceProvider" />.</param>
-    /// <param name="webContextFactory">The <see cref="BlogContext" /> factory.</param>
-    public TemplateService(IServiceProvider serviceProvider, IDbContextFactory<BlogContext> webContextFactory)
+    /// <param name="webContextFactory">The <see cref="WebContext" /> factory.</param>
+    public TemplateService(IServiceProvider serviceProvider,
+        IDbContextFactory<WebContext> webContextFactory)
     {
         _formatter = Smart.CreateDefaultSmartFormat();
         _formatter.AddExtensions(new DefaultSource());
@@ -34,15 +36,21 @@ internal sealed class TemplateService : ITemplateService
     }
 
     /// <inheritdoc />
-    public string RenderTemplate(TemplateInline templateInline)
+    public string RenderGlobalTemplate(TemplateInline templateInline)
     {
         if (templateInline is null) throw new ArgumentNullException(nameof(templateInline));
 
-        using BlogContext webContext = _webContextFactory.CreateDbContext();
-        Template? template = webContext.Templates.Find(templateInline.Name);
+        using WebContext context = _webContextFactory.CreateDbContext();
+        Template? template = context.Templates.Find(templateInline.Name);
+        return RenderTemplate(templateInline, template);
+    }
+
+    /// <inheritdoc />
+    public string RenderTemplate(TemplateInline inline, ITemplate? template)
+    {
         if (template is null)
         {
-            return $"{{{{{templateInline.Name}}}}}";
+            return $"{{{{{inline.Name}}}}}";
         }
 
         Span<byte> randomBytes = stackalloc byte[20];
@@ -50,9 +58,9 @@ internal sealed class TemplateService : ITemplateService
 
         var formatted = new
         {
-            templateInline.ArgumentList,
-            templateInline.ArgumentString,
-            templateInline.Params,
+            inline.ArgumentList,
+            inline.ArgumentString,
+            inline.Params,
             RandomInt = BinaryPrimitives.ReadInt32LittleEndian(randomBytes[..4]),
             RandomGuid = new Guid(randomBytes[4..]).ToString("N"),
         };
@@ -63,7 +71,7 @@ internal sealed class TemplateService : ITemplateService
         }
         catch
         {
-            return $"{{{{{templateInline.Name}|{templateInline.ArgumentString}}}}}";
+            return $"{{{{{inline.Name}|{inline.ArgumentString}}}}}";
         }
     }
 }