https://twitter.com/EgorBo/status/1565328134043344896 challenge

performance_improvements_in_net_7.cs

// https://twitter.com/EgorBo/status/1565328134043344896

using System.Collections.Concurrent;
using System.Diagnostics;
using System.Net.Http.Json;
using System.Text.Json.Serialization;
using System.Text.RegularExpressions;

var sw = Stopwatch.StartNew();

string file = await new HttpClient().GetStringAsync(
    "https://devblogs.microsoft.com/dotnet/performance_improvements_in_net_7/");

MatchCollection pullRequestUrls =
    Regex.Matches(file, @"https:\/\/github.com\/(?<owner>[a-zA-Z-]+)\/(?<repo>[a-zA-Z-]+)\/pull\/(?<pull>[0-9]+)");

int total = pullRequestUrls.Count;
int counter = 0;

ConcurrentBag<string> authors = new();

var PullRequests = pullRequestUrls
    .Select(m => new PullRequest(m.Value, m.Groups["owner"].Value, m.Groups["repo"].Value, m.Groups["pull"].Value))
    .Distinct();

HttpClient githubClient = GetClient();

await Parallel.ForEachAsync(PullRequests.AsParallel(),
    new ParallelOptions { MaxDegreeOfParallelism = 8 },
    async (pullRequest, cancellationToken) =>
    {
        try
        {
            Pull? pull = await githubClient.GetFromJsonAsync<Pull>(
                requestUri: $"/repos/{pullRequest.Owner}/{pullRequest.Repo}/pulls/{pullRequest.PullNumber}",
                cancellationToken: cancellationToken);
            if (pull is null) return;

            Interlocked.Increment(ref counter);
            Console.WriteLine($"\x1b[36m{counter}/{total}\u001b[0m: {pull.Title} by \u001b[32m{pull.User.Login}\u001b[0m");
            authors.Add(pull.User.Login);
        }
        catch (HttpRequestException)
        {
            Console.WriteLine($"Failed to load: {pullRequest.ToString()}");
        }
    });

var pad = authors.Select(a => a.Length).Max() + 1;
foreach (var author in authors.GroupBy(g => g).OrderByDescending(g => g.Count()))
{
    Console.WriteLine($"\u001b[32m{author.Key.PadRight(pad)}\u001b[0m -- {author.Count()}");
}

sw.Stop();
Console.WriteLine($"Elapsed time \u001b[33m{sw.Elapsed.TotalSeconds}\u001b[0m seconds.");

static HttpClient GetClient()
{
    HttpClient githubClient = new HttpClient()
    {
        BaseAddress = new Uri(@"https://api.github.com"),
    };
    githubClient.DefaultRequestHeaders.Accept.Add(new("application/vnd.github.v3+json"));
    githubClient.DefaultRequestHeaders.Authorization = new("token", Environment.GetEnvironmentVariable("GITHUB_TOKEN"));
    githubClient.DefaultRequestHeaders.UserAgent.ParseAdd("testapp");
    return githubClient;
}

record PullRequest(
    string Uri,
    string Owner,
    string Repo,
    string PullNumber);

record Pull(
    [property: JsonPropertyName("title")] string Title,
    [property: JsonPropertyName("user")] User User);

record User(
    [property: JsonPropertyName("login")] string Login);