/// <summary>
/// Initializes <see cref="RssMixxxer"/>'s background maintenance.
/// </summary>
public void ForMyNeeds()
{
lock (_syncRoot)
{
if (_isRunning)
{
_log.Warn("Failed attempt to start mixing feeds - another instance is already running.");
return;
}
_backgroundOperation = new BackgroundOperation(() =>
{
var config = _configProvider.ProvideConfig();
var sourceFeeds = config.SourceFeeds;
_log.Debug("Synchronizing {0} feeds", sourceFeeds.Length);
process_feeds(sourceFeeds);
}, TimeSpan.FromSeconds(_configProvider.ProvideConfig().SyncInterval_Seconds));
_backgroundOperation.Start();
_isRunning = true;
}
}
public FeedComposer(ILocalFeedsProvider localFeedsProvider, IFeedMixer feedMixer, IFeedAggregatorConfigProvider configProvider)
{
_localFeedsProvider = localFeedsProvider;
_feedMixer = feedMixer;
_config = configProvider.ProvideConfig();
}
public RemoteContentResponse ReadRemoteSource(LocalFeedInfo feedInfo)
{
_log.Debug("Trying to read remote source '{0}' (etag: {1}, last fetch: {2})", feedInfo.Url, feedInfo.Etag, feedInfo.LastFetch);
try
{
if (feedInfo.LastFetch.HasValue && _configProvider.ProvideConfig().PrefetchHeadRequest)
{
var head_request = _httpRequestFactory.CreateRequest(feedInfo.Url);
head_request.Method = "HEAD";
using (var head_response = (HttpWebResponse)head_request.GetResponseEx())
{
DateTime last_modified = head_response.LastModified.ToUniversalTime();
DateTime last_fetch = feedInfo.LastFetch.Value.ToUniversalTime();
if (last_modified < last_fetch)
{
_log.Debug("HEAD request indicates that there is no new content available (last_modified={0}, last_fetch={1}), returning NotModified.", last_modified, last_fetch);
return(RemoteContentResponse.NotModified(head_response.StatusCode));
}
}
}
var get_request = _httpRequestFactory.CreateRequest(feedInfo.Url);
if (feedInfo.LastFetch != null)
{
get_request.IfModifiedSince = feedInfo.LastFetch.Value;
}
if (string.IsNullOrWhiteSpace(feedInfo.Etag) == false)
{
get_request.Headers[HttpRequestHeader.IfNoneMatch] = feedInfo.Etag;
}
using (var response = (HttpWebResponse)get_request.GetResponseEx())
{
if (response.StatusCode == HttpStatusCode.OK)
{
string etag = response.Headers[HttpResponseHeader.ETag];
Stream responseStream = response.GetResponseStream();
using (var streamReader = new StreamReader(responseStream))
{
string responseText = streamReader.ReadToEnd();
responseText = _contentPreProcessor.PreProcess(responseText);
using (var stringReader = new StringReader(responseText))
{
using (var reader = XmlReader.Create(stringReader))
{
var feed = SyndicationFeed.Load(reader);
_log.Info("Returning new content for remote source '{0}' with {1} items", feedInfo.Url, feed.Items.Count());
return(new RemoteContentResponse(true, etag, feed, response.StatusCode));
}
}
}
}
else
{
string message = string.Format("No new content for remote source '{0}', response status is {1}", feedInfo.Url, response.StatusCode);
if (response.StatusCode == HttpStatusCode.NotModified)
{
_log.Debug(message);
}
else
{
_log.Warn(message);
}
return(RemoteContentResponse.NotModified(response.StatusCode));
}
}
}
catch (Exception exc)
{
_log.ErrorException(string.Format("Failed to read remote source '{0}'", feedInfo.Url), exc);
throw new CannotReachRemoteSourceException(feedInfo.Url, exc);
}
}
