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using System;
using System.Collections.Concurrent;
using System.Linq;
using System.Threading;
using System.Timers;
using BirdsiteLive.Twitter.Models;
namespace BirdsiteLive.Statistics.Domain
{
public interface ITwitterStatisticsHandler
{
void CalledUserApi();
void CalledTweetApi();
void CalledTimelineApi();
ApiStatistics GetStatistics();
}
//Rate limits: https://developer.twitter.com/en/docs/twitter-api/v1/rate-limits
public class TwitterStatisticsHandler : ITwitterStatisticsHandler
{
private static int _userCalls;
private static int _tweetCalls;
private static int _timelineCalls;
private static ConcurrentDictionary<DateTime, ApiStatisticsSnapshot> _snapshots = new ConcurrentDictionary<DateTime, ApiStatisticsSnapshot>();
private static System.Timers.Timer _resetTimer;
#region Ctor
public TwitterStatisticsHandler()
{
if (_resetTimer == null)
{
_resetTimer = new System.Timers.Timer();
_resetTimer.Elapsed += OnTimeResetEvent;
_resetTimer.Interval = 15 * 60 * 1000; // 15"
_resetTimer.Enabled = true;
}
}
#endregion
private void OnTimeResetEvent(object sender, ElapsedEventArgs e)
{
// Add snapshot
var snapshot = new ApiStatisticsSnapshot(_userCalls, _tweetCalls, _timelineCalls);
bool success;
do
{
success = _snapshots.TryAdd(snapshot.SnapshotDate, snapshot);
} while (!success);
// Reset
Interlocked.Exchange(ref _userCalls, 0);
Interlocked.Exchange(ref _tweetCalls, 0);
Interlocked.Exchange(ref _timelineCalls, 0);
// Clean up
var now = DateTime.UtcNow;
var oldSnapshots = _snapshots.Keys.Where(x => (now - x).TotalHours > 24).ToList();
foreach (var old in oldSnapshots) _snapshots.TryRemove(old, out var data);
}
public void CalledUserApi() //GET users/show - 900/15mins
{
Interlocked.Increment(ref _userCalls);
}
public void CalledTweetApi() //GET statuses/lookup - 300/15mins
{
Interlocked.Increment(ref _tweetCalls);
}
public void CalledTimelineApi() // GET statuses/user_timeline - 1500/15 mins
{
Interlocked.Increment(ref _timelineCalls);
}
public ApiStatistics GetStatistics()
{
var snapshots = _snapshots.Values.ToList();
var userCalls = snapshots.Select(x => x.UserCalls).ToList();
var tweetCalls = snapshots.Select(x => x.TweetCalls).ToList();
var timelineCalls = snapshots.Select(x => x.TimelineCalls).ToList();
return new ApiStatistics
{
UserCallsCountMin = userCalls.Any() ? userCalls.Min() : 0,
UserCallsCountAvg = userCalls.Any() ? (int)userCalls.Average() : 0,
UserCallsCountMax = userCalls.Any() ? userCalls.Max() : 0,
UserCallsMax = 300,
TweetCallsCountMin = tweetCalls.Any() ? tweetCalls.Min() : 0,
TweetCallsCountAvg = tweetCalls.Any() ? (int)tweetCalls.Average() : 0,
TweetCallsCountMax = tweetCalls.Any() ? tweetCalls.Max() : 0,
TweetCallsMax = 300,
TimelineCallsCountMin = timelineCalls.Any() ? timelineCalls.Min() : 0,
TimelineCallsCountAvg = timelineCalls.Any() ? (int)timelineCalls.Average() : 0,
TimelineCallsCountMax = timelineCalls.Any() ? timelineCalls.Max() : 0,
TimelineCallsMax = 1000
};
}
}
internal class ApiStatisticsSnapshot
{
#region Ctor
public ApiStatisticsSnapshot(int userCalls, int tweetCalls, int timelineCalls)
{
UserCalls = userCalls;
TweetCalls = tweetCalls;
TimelineCalls = timelineCalls;
SnapshotDate = DateTime.UtcNow;
}
#endregion
public DateTime SnapshotDate { get; }
public int UserCalls { get; set; }
public int TweetCalls { get; set; }
public int TimelineCalls { get; set; }
}
}