/// <summary>
/// Enumerate revisions from the page.
/// </summary>
/// <remarks>Redirect resolution is disabled in this operation.</remarks>
public static IAsyncEnumerable <Revision> EnumRevisionsAsync(RevisionGenerator generator, PageQueryOptions options)
{
Debug.Assert(generator != null);
Debug.Assert(generator.Page != null);
Debug.Assert((options & PageQueryOptions.ResolveRedirects) != PageQueryOptions.ResolveRedirects);
var site = generator.Site;
var pa = GetPageFetchingParams(options);
foreach (var p in generator.GetGeneratorParams())
{
pa[p.Key] = p.Value;
}
var serializer = Utility.CreateWikiJsonSerializer();
serializer.Converters.Add(new DelegateCreationConverter <Revision>(t => new Revision(generator.Page)));
var resultCounter = 0;
return(new PagedQueryAsyncEnumerable(site, pa)
.SelectMany(jresult =>
{
var jpage = jresult["pages"].Values().First();
var revisions = (JArray)jpage?["revisions"];
if (revisions != null)
{
resultCounter += revisions.Count;
site.Logger?.Trace(site, $"Loaded {resultCounter} revisions of {generator.Page}.");
var result = revisions.ToObject <IList <Revision> >(serializer);
return result.ToAsyncEnumerable();
}
return AsyncEnumerable.Empty <Revision>();
}));
}
/// <summary>
/// Enumerates revisions of the page, descending in tim.
/// </summary>
/// <param name="pagingSize">Maximum items returned per request. <c>null</c> for maximum allowed count.</param>
/// <param name="options">Options for revision listing. Note <see cref="PageQueryOptions.ResolveRedirects"/> will raise exception.</param>
/// <exception cref="ArgumentOutOfRangeException"><paramref name="pagingSize"/> is non-positive.</exception>
/// <remarks>To gain full control of revision enumeration, you can use <see cref="RevisionGenerator" />.</remarks>
public IAsyncEnumerable <Revision> EnumRevisionsAsync(int?pagingSize, PageQueryOptions options)
{
if (pagingSize <= 0)
{
throw new ArgumentOutOfRangeException(nameof(pagingSize));
}
var gen = new RevisionGenerator(this)
{
PagingSize = pagingSize
};
return(gen.EnumRevisionsAsync(options));
}
public async Task WpTestEnumRevisionsTest3()
{
var site = await WpTest2SiteAsync;
// 5,100 revisions in total
var page = new WikiPage(site, "Page:Edit_page_for_chrome");
var t1 = new DateTime(2014, 10, 20, 10, 0, 0, DateTimeKind.Utc);
var t2 = new DateTime(2014, 10, 22, 10, 0, 0, DateTimeKind.Utc);
var gen = new RevisionGenerator(page)
{
TimeAscending = true,
StartTime = t1,
EndTime = t2,
};
var revisions = await gen.EnumRevisionsAsync().ToList();
Assert.True(revisions.SequenceEqual(revisions.OrderBy(r => r.TimeStamp)));
Assert.True(revisions.First().TimeStamp >= t1);
Assert.True(revisions.Last().TimeStamp <= t2);
// This holds on 2016-12-09
Assert.Equal(32, revisions.Count);
ShallowTrace(revisions);
}
