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rework news downloading

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This commit is contained in:
Luke Pulverenti
2014-01-18 23:25:01 -05:00
parent 18a9720857
commit d2cae40128
8 changed files with 182 additions and 92 deletions
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108
MediaBrowser.Server.Implementations/News/NewsService.cs
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@@ -1,38 +1,46 @@
using MediaBrowser.Common.Configuration;
using MediaBrowser.Common.IO;
using MediaBrowser.Common.Net;
using MediaBrowser.Controller.News;
using MediaBrowser.Model.News;
using MediaBrowser.Model.Querying;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using System.Xml;
using MediaBrowser.Model.Serialization;
namespace MediaBrowser.Server.Implementations.News
{
public class NewsService : INewsService
{
private readonly IApplicationPaths _appPaths;
private readonly IFileSystem _fileSystem;
private readonly IHttpClient _httpClient;
private readonly IJsonSerializer _json;
public NewsService(IApplicationPaths appPaths, IFileSystem fileSystem, IHttpClient httpClient)
public NewsService(IApplicationPaths appPaths, IJsonSerializer json)
{
_appPaths = appPaths;
_fileSystem = fileSystem;
_httpClient = httpClient;
_json = json;
}
public async Task<QueryResult<NewsItem>> GetProductNews(NewsQuery query)
public QueryResult<NewsItem> GetProductNews(NewsQuery query)
{
var path = Path.Combine(_appPaths.CachePath, "news.xml");
try
{
return GetProductNewsInternal(query);
}
catch (FileNotFoundException)
{
// No biggie
return new QueryResult<NewsItem>
{
Items = new NewsItem[] { }
};
}
}
await EnsureNewsFile(path).ConfigureAwait(false);
private QueryResult<NewsItem> GetProductNewsInternal(NewsQuery query)
{
var path = Path.Combine(_appPaths.CachePath, "news.json");
var items = GetNewsItems(path);
var items = GetNewsItems(path).OrderByDescending(i => i.Date);
var itemsArray = items.ToArray();
var count = itemsArray.Length;
@@ -56,77 +64,7 @@ namespace MediaBrowser.Server.Implementations.News
private IEnumerable<NewsItem> GetNewsItems(string path)
{
var xmlDoc = new XmlDocument();
xmlDoc.Load(path);
return ParseRssItems(xmlDoc);
}
private IEnumerable<NewsItem> ParseRssItems(XmlDocument xmlDoc)
{
var nodes = xmlDoc.SelectNodes("rss/channel/item");
if (nodes == null)
{
yield return null;
}
foreach (XmlNode node in nodes)
{
var newsItem = new NewsItem();
newsItem.Title = ParseDocElements(node, "title");
newsItem.Description = ParseDocElements(node, "description");
newsItem.Link = ParseDocElements(node, "link");
var date = ParseDocElements(node, "pubDate");
DateTime parsedDate;
if (DateTime.TryParse(date, out parsedDate))
{
newsItem.Date = parsedDate;
}
yield return newsItem;
}
}
private string ParseDocElements(XmlNode parent, string xPath)
{
var node = parent.SelectSingleNode(xPath);
return node != null ? node.InnerText : "Unresolvable";
}
/// <summary>
/// Ensures the news file.
/// </summary>
/// <param name="path">The path.</param>
/// <returns>Task.</returns>
private async Task EnsureNewsFile(string path)
{
var info = _fileSystem.GetFileSystemInfo(path);
if (!info.Exists || (DateTime.UtcNow - _fileSystem.GetLastWriteTimeUtc(info)).TotalHours > 12)
{
var requestOptions = new HttpRequestOptions
{
Url = "http://mediabrowser3.com/community/index.php?/blog/rss/1-media-browser-developers-blog",
Progress = new Progress<double>()
};
using (var stream = await _httpClient.Get(requestOptions).ConfigureAwait(false))
{
using (var fileStream = _fileSystem.GetFileStream(path, FileMode.Create, FileAccess.Write, FileShare.Read, true))
{
await stream.CopyToAsync(fileStream).ConfigureAwait(false);
}
}
}
return _json.DeserializeFromFile<List<NewsItem>>(path);
}
}
}