public async Task <int> GetPackageCountAsync(CancellationToken token)
{
string queryString = string.Format(_searchUriFormat, 0, _pageSize);
Uri queryUri = new Uri(queryString);
using (HttpClient client = new HttpClient())
using (HttpResponseMessage response = await client.GetAsync(queryUri, token).ConfigureAwait(false))
{
response.EnsureSuccessStatusCode();
string responseText = await response.Content.ReadAsStringAsync(token).ConfigureAwait(false);
NuGetPackageSearchResult resultsForPage = NuGetPackageSearchResult.FromJObject(JObject.Parse(responseText));
return(resultsForPage.TotalHits);
}
}
//property names are explained here: https://docs.microsoft.com/en-us/nuget/api/search-query-service-resource
internal static NuGetPackageSearchResult FromJObject(JObject entry)
{
NuGetPackageSearchResult searchResult = new NuGetPackageSearchResult();
searchResult.TotalHits = entry.ToInt32("totalHits");
var dataArray = entry.Get <JArray>("data");
if (dataArray != null)
{
foreach (JToken data in dataArray)
{
JObject?dataObj = data as JObject;
if (dataObj != null)
{
searchResult.Data.Add(NuGetPackageSourceInfo.FromJObject(dataObj));
}
}
}
return(searchResult);
}
public async IAsyncEnumerable <ITemplatePackageInfo> GetCandidatePacksAsync([EnumeratorCancellation] CancellationToken token)
{
int skip = 0;
bool done = false;
int packCount = 0;
int totalPackCount = 0;
int pageSize = _pageSize;
do
{
//NuGet search API limit is 3000, so try to get all the packages exceeding the limit.
if (skip + pageSize > 3000)
{
//get all the packages up to 3000
pageSize = skip + pageSize - 3000;
}
if (skip >= 3000)
{
//try to get all remaining packages
skip = 3000;
pageSize = totalPackCount - 3000;
//pageSize limit is 1000
//therefore max amount of packages that can be retrieved is 4000.
if (pageSize > 1000)
{
pageSize = 1000;
}
}
string queryString = string.Format(_searchUriFormat, skip, pageSize);
Uri queryUri = new Uri(queryString);
using (HttpClient client = new HttpClient())
using (HttpResponseMessage response = await client.GetAsync(queryUri, token).ConfigureAwait(false))
{
if (response.IsSuccessStatusCode)
{
string responseText = await response.Content.ReadAsStringAsync(token).ConfigureAwait(false);
NuGetPackageSearchResult resultsForPage = NuGetPackageSearchResult.FromJObject(JObject.Parse(responseText));
totalPackCount = resultsForPage.TotalHits;
if (resultsForPage.Data.Count > 0)
{
skip += pageSize;
packCount += resultsForPage.Data.Count;
foreach (NuGetPackageSourceInfo sourceInfo in resultsForPage.Data)
{
yield return(sourceInfo);
}
}
//4000 is NuGet limit, stop after 4000 is processed.
if (totalPackCount == packCount || totalPackCount > 4000 && packCount == 4000)
{
if (totalPackCount > 4000)
{
Console.WriteLine($"Warning: {totalPackCount} packages were found, but only first 4000 packages can be retrieved. Other packages will be skipped.");
}
done = true;
}
else if (skip > 3000 || skip >= totalPackCount)
{
Console.WriteLine($"Failed to get all search results from NuGet: expected {totalPackCount}, retrieved: {packCount}.");
throw new Exception("Failed to get search results from NuGet search API.");
}
}
else
{
Console.WriteLine($"Unexpected response from NuGet: code {response.StatusCode}, details: {response.ToString()}.");
throw new Exception("Failed to get search results from NuGet search API.");
}
}
}while (!done && !_runOnlyOnePage);
}