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NewsJobProvider.cs
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NewsJobProvider.cs
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using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
using HonzaBotner.Scheduler.Contract;
using HonzaBotner.Services.Contract;
using HonzaBotner.Services.Contract.Dto;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
namespace HonzaBotner.Discord.Services.Jobs;
// Run every 30 minutes
[Cron("0 */30 * * * *")]
public class NewsJobProvider : IJob
{
private const int RunOffset = -3;
public string Name { get; } = "news-publisher";
private readonly ILogger<NewsJobProvider> _logger;
private readonly INewsConfigService _configService;
private readonly IServiceProvider _serviceProvider;
private static readonly ConcurrentDictionary<string, Type> s_typesCache = new();
public NewsJobProvider(ILogger<NewsJobProvider> logger, INewsConfigService configService,
IServiceProvider serviceProvider)
{
_logger = logger;
_configService = configService;
_serviceProvider = serviceProvider;
}
public async Task ExecuteAsync(CancellationToken cancellationToken)
{
_logger.LogInformation("Starting news fetching");
IList<NewsConfig> sources = await _configService.ListConfigsAsync();
using IServiceScope scope = _serviceProvider.CreateAsyncScope();
foreach (NewsConfig newsSource in sources)
{
INewsService newsService =
scope.ServiceProvider.GetRequiredService(GetType(newsSource.NewsProvider.ToType())) as INewsService
?? throw new InvalidCastException("Type must be INewsService");
IPublisherService publisherService =
scope.ServiceProvider.GetRequiredService(GetType(newsSource.Publisher.ToType())) as IPublisherService
?? throw new InvalidCastException("Type must be IPublisherService");
DateTime now = DateTime.Now.AddMinutes(RunOffset);
IAsyncEnumerable<News> news = newsService.FetchDataAsync(newsSource.Source, newsSource.LastFetched);
await foreach (News item in news.WithCancellation(cancellationToken))
{
await publisherService.Publish(item, newsSource.Channels);
}
await _configService.UpdateFetchDateAsync(newsSource.Id, now);
}
}
private static Type GetType(string typeName)
{
if (s_typesCache.TryGetValue(typeName, out Type? type))
{
return type;
}
type = Type.GetType(typeName) ??
throw new ArgumentOutOfRangeException(nameof(typeName), $"Invalid type: {typeName}");
return s_typesCache[typeName] = type;
}
}