Saga.cs
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using Pole.Core.Serialization;
using Pole.Core.Utils.Abstraction;
using Pole.Sagas.Client.Abstraction;
using Pole.Sagas.Core;
using Pole.Sagas.Core.Abstraction;
using Pole.Sagas.Core.Exceptions;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
namespace Pole.Sagas.Client
{
public class Saga : ISaga
{
private List<ActivityWapper> activities = new List<ActivityWapper>();
private IServiceProvider serviceProvider;
private IEventSender eventSender;
private ISnowflakeIdGenerator snowflakeIdGenerator;
private IActivityFinder activityFinder;
private PoleSagasOption poleSagasOption;
private int CurrentMaxOrder
{
get { return activities.Count; }
}
/// <summary>
/// 如果 等于 -1 说明已经在执行补偿操作,此时这个值已经没有意义
/// </summary>
private int currentExecuteOrder = 0;
/// <summary>
/// 如果 等于 -1 说明已经还未执行补偿操作,此时这个值没有意义
/// </summary>
private int currentCompensateOrder = -1;
private ISerializer serializer;
public string Id { get; }
internal Saga(ISnowflakeIdGenerator snowflakeIdGenerator, IServiceProvider serviceProvider, IEventSender eventSender, PoleSagasOption poleSagasOption, ISerializer serializer, IActivityFinder activityFinder)
{
this.snowflakeIdGenerator = snowflakeIdGenerator;
this.serviceProvider = serviceProvider;
this.eventSender = eventSender;
this.poleSagasOption = poleSagasOption;
this.serializer = serializer;
this.activityFinder = activityFinder;
Id = snowflakeIdGenerator.NextId();
}
internal Saga(ISnowflakeIdGenerator snowflakeIdGenerator, IServiceProvider serviceProvider, IEventSender eventSender, PoleSagasOption poleSagasOption, ISerializer serializer, IActivityFinder activityFinder, string id)
{
this.snowflakeIdGenerator = snowflakeIdGenerator;
this.serviceProvider = serviceProvider;
this.eventSender = eventSender;
this.poleSagasOption = poleSagasOption;
this.serializer = serializer;
this.activityFinder = activityFinder;
Id = id;
this.currentExecuteOrder = -1;
}
public void AddActivity(string activityName, object data, int timeOutSeconds = 2)
{
var targetActivityType = activityFinder.FindType(activityName);
var activityInterface = targetActivityType.GetInterfaces().FirstOrDefault();
if (!activityInterface.IsGenericType)
{
throw new ActivityImplementIrregularException(activityName);
}
var dataType = activityInterface.GetGenericArguments()[0];
ActivityWapper activityWapper = new ActivityWapper
{
Name = activityName,
ActivityDataType = dataType,
ActivityStatus = ActivityStatus.NotStarted,
ActivityType = targetActivityType,
DataObj = data,
Order = CurrentMaxOrder,
ServiceProvider = serviceProvider,
TimeOutSeconds = 2,
};
activities.Add(activityWapper);
}
internal void AddActivity(string activityName, string activityStatus, object data, int order, int timeOutSeconds = 2)
{
var targetActivityType = activityFinder.FindType(activityName);
var activityInterface = targetActivityType.GetInterfaces().FirstOrDefault();
if (!activityInterface.IsGenericType)
{
throw new ActivityNotFoundWhenCompensateRetryException(activityName);
}
var dataType = activityInterface.GetGenericArguments()[0];
ActivityWapper activityWapper = new ActivityWapper
{
Name = activityName,
ActivityDataType = dataType,
ActivityStatus = (ActivityStatus)Enum.Parse(typeof(ActivityStatus), activityStatus),
ActivityType = targetActivityType,
DataObj = data,
Order = order,
ServiceProvider = serviceProvider,
TimeOutSeconds = 2,
};
activities.Add(activityWapper);
}
public async Task<SagaResult> GetResult()
{
await eventSender.SagaStarted(Id, poleSagasOption.ServiceName, DateTime.UtcNow);
var executeActivity = GetNextExecuteActivity();
if (executeActivity == null)
{
var expiresAt = DateTime.UtcNow.AddSeconds(poleSagasOption.CompeletedSagaExpiredAfterSeconds);
await eventSender.SagaEnded(Id, expiresAt);
return SagaResult.SuccessResult;
}
var result = await RecursiveExecuteActivity(executeActivity);
return result;
}
/// <summary>
/// if true should ended this sagas ,if false do nothing continue retry
/// </summary>
/// <returns></returns>
internal async Task<bool> CompensateWhenRetry()
{
this.currentCompensateOrder = CurrentMaxOrder + 1;
var compensateActivity = GetNextCompensateActivity();
if (compensateActivity == null)
{
return true;
}
await RecursiveCompensateActivity(compensateActivity);
if (activities.Any(m => m.ActivityStatus != ActivityStatus.Compensated|| m.ActivityStatus != ActivityStatus.CompensateAborted))
{
return false;
}
return true;
}
private ActivityWapper GetNextExecuteActivity()
{
if (currentExecuteOrder == CurrentMaxOrder)
{
return null;
}
currentExecuteOrder++;
return activities[currentExecuteOrder - 1];
}
private ActivityWapper GetNextCompensateActivity()
{
currentCompensateOrder--;
if (currentCompensateOrder == 0)
{
return null;
}
return activities[currentCompensateOrder - 1];
}
private async Task RecursiveCompensateActivity(ActivityWapper activityWapper)
{
var activityId = activityWapper.Id;
if (activityWapper.ActivityStatus == ActivityStatus.ExecutingOvertime)
{
activityWapper.OvertimeCompensateTimes++;
}
else
{
activityWapper.CompensateTimes++;
}
try
{
await activityWapper.InvokeCompensate();
if (activityWapper.ActivityStatus == ActivityStatus.ExecutingOvertime)
{
// 超时 补偿次数已到
var isCompensated = activityWapper.CompensateTimes == poleSagasOption.MaxOvertimeCompensateTimes;
await eventSender.ActivityOvertimeCompensated(activityId, isCompensated);
}
else
{
await eventSender.ActivityCompensated(activityId);
}
var compensateActivity = GetNextCompensateActivity();
if (compensateActivity == null)
{
return;
}
await RecursiveCompensateActivity(compensateActivity);
}
catch (Exception exception)
{
// todo: 超时操作 如果出错可能 减少 补偿次数 这里 先不做处理
if (activityWapper.CompensateTimes == poleSagasOption.MaxCompensateTimes)
{
// 此时 结束 saga 并且设置状态 为 Error
await eventSender.ActivityCompensateAborted(activityId, Id, exception.InnerException != null ? exception.InnerException.Message + exception.StackTrace : exception.Message + exception.StackTrace);
}
else
{
await eventSender.ActivityCompensateAborted(activityId, string.Empty, exception.InnerException != null ? exception.InnerException.Message + exception.StackTrace : exception.Message + exception.StackTrace);
}
}
}
private async Task<ActivityExecuteResult> RecursiveExecuteActivity(ActivityWapper activityWapper)
{
var activityId = snowflakeIdGenerator.NextId();
activityWapper.Id = activityId;
activityWapper.CancellationTokenSource = new System.Threading.CancellationTokenSource(2 * 1000);
try
{
var bytesContent = serializer.SerializeToUtf8Bytes(activityWapper.DataObj, activityWapper.ActivityDataType);
await eventSender.ActivityExecuting(activityId, activityWapper.Name, Id, bytesContent, activityWapper.Order, DateTime.UtcNow);
var result = await activityWapper.InvokeExecute();
if (!result.IsSuccess)
{
await eventSender.ActivityRevoked(activityId);
await CompensateActivity(result, currentExecuteOrder);
return result;
}
var executeActivity = GetNextExecuteActivity();
if (executeActivity == null)
{
return result;
}
else
{
return await RecursiveExecuteActivity(executeActivity);
}
}
catch (Exception exception)
{
if (activityWapper.CancellationTokenSource.Token.IsCancellationRequested)
{
var errors = exception.InnerException != null ? exception.InnerException.Message + exception.StackTrace : exception.Message + exception.StackTrace;
var result = new ActivityExecuteResult
{
IsSuccess = false,
Errors = errors
};
var bytesContent = serializer.SerializeToUtf8Bytes(activityWapper.DataObj, activityWapper.ActivityDataType);
await eventSender.ActivityExecuteOvertime(activityId, activityWapper.Name, bytesContent, DateTime.UtcNow);
// 超时的时候 需要首先补偿这个超时的操作
return await CompensateActivity(result, currentExecuteOrder + 1);
}
else
{
var errors = exception.InnerException != null ? exception.InnerException.Message + exception.StackTrace : exception.Message + exception.StackTrace;
var result = new ActivityExecuteResult
{
IsSuccess = false,
Errors = errors
};
await eventSender.ActivityExecuteAborted(activityId);
// 出错的时候 需要首先补偿这个出错的操作
return await CompensateActivity(result, currentExecuteOrder + 1);
}
}
}
private async Task<ActivityExecuteResult> CompensateActivity(ActivityExecuteResult result, int currentCompensateOrder)
{
this.currentCompensateOrder = currentCompensateOrder;
currentExecuteOrder = -1;
var compensateActivity = GetNextCompensateActivity();
if (compensateActivity == null)
{
return result;
}
await RecursiveCompensateActivity(compensateActivity);
return result;
}
}
}