113 lines
3.3 KiB
C#
113 lines
3.3 KiB
C#
using System.Diagnostics;
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using Markdig;
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using Microsoft.Extensions.Logging;
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using YaeBlog.Core.Exceptions;
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using YaeBlog.Core.Models;
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using YamlDotNet.Core;
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using YamlDotNet.Serialization;
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namespace YaeBlog.Core.Services;
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public class RendererService(ILogger<RendererService> logger,
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EssayScanService essayScanService,
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MarkdownPipeline markdownPipeline,
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IDeserializer yamlDeserializer,
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EssayContentService essayContentService)
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{
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private readonly Stopwatch _stopwatch = new();
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public async Task RenderAsync()
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{
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_stopwatch.Start();
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logger.LogInformation("Render essays start.");
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List<BlogContent> contents = await essayScanService.ScanAsync();
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List<BlogEssay> essays = [];
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await Task.Run(() =>
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{
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foreach (BlogContent content in contents)
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{
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MarkdownMetadata? metadata = TryParseMetadata(content);
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BlogEssay essay = new()
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{
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Title = metadata?.Title ?? content.FileName,
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FileName = content.FileName,
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PublishTime = metadata?.Date ?? DateTime.Now,
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HtmlContent = content.FileContent
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};
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if (metadata?.Tags is not null)
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{
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essay.Tags.AddRange(metadata.Tags);
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}
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essays.Add(essay);
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}
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});
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Parallel.ForEach(essays, essay =>
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{
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BlogEssay newEssay = new()
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{
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Title = essay.Title,
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FileName = essay.FileName,
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PublishTime = essay.PublishTime,
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HtmlContent = Markdown.ToHtml(essay.HtmlContent, markdownPipeline)
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};
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newEssay.Tags.AddRange(essay.Tags);
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if (!essayContentService.TryAdd(newEssay.FileName, newEssay))
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{
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throw new BlogFileException(
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$"There are two essays with the same name: '{newEssay.FileName}'.");
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}
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logger.LogDebug("Render markdown file {}.", newEssay);
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});
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_stopwatch.Stop();
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logger.LogInformation("Render finished, consuming {} s.",
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_stopwatch.Elapsed.ToString("s\\.fff"));
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}
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private MarkdownMetadata? TryParseMetadata(BlogContent content)
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{
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string fileContent = content.FileContent.Trim();
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if (!fileContent.StartsWith("---"))
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{
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return null;
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}
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// 移除起始的---
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fileContent = fileContent[3..];
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int lastPos = fileContent.IndexOf("---", StringComparison.Ordinal);
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if (lastPos is -1 or 0)
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{
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return null;
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}
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string yamlContent = fileContent[..lastPos];
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// 返回去掉元数据之后的文本
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lastPos += 3;
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content.FileContent = fileContent[lastPos..];
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try
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{
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MarkdownMetadata metadata =
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yamlDeserializer.Deserialize<MarkdownMetadata>(yamlContent);
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logger.LogDebug("Title: {}, Publish Date: {}.",
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metadata.Title, metadata.Date);
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return metadata;
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}
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catch (YamlException e)
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{
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logger.LogWarning("Failed to parse '{}' metadata: {}", yamlContent, e);
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return null;
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}
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}
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}
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