ds8-solution-pro/ds-wms-service/DS.WMS.Core/Flow/Method/FlowInstanceService.cs

using DS.Module.Core;
using DS.Module.Core.Extensions;
using DS.WMS.Core.Flow.Dtos;
using DS.WMS.Core.Flow.Entity;
using DS.WMS.Core.Flow.Interface;
using DS.WMS.Core.Op.Entity;
using DS.WMS.Core.Sys.Entity;
using Mapster;
using Newtonsoft.Json;
using SqlSugar;

namespace DS.WMS.Core.Flow.Method;

/// <summary>
/// 工作流服务
/// </summary>
public class FlowInstanceService : ServiceBase, IFlowInstanceService
{
    static readonly ApiFox api;

    static FlowInstanceService()
    {
        api = new ApiFox();
    }

    /// <summary>
    /// 初始化
    /// </summary>
    /// <param name="serviceProvider"></param>
    public FlowInstanceService(IServiceProvider serviceProvider) : base(serviceProvider)
    {
    }

    /// <summary>
    /// 当工作流类型为会签时，返回首个执行人
    /// </summary>
    /// <param name="instance">运行实例</param>
    /// <returns></returns>
    public static string GetNextMarkers(FlowInstance instance)
    {
        string[] markers = GetMarkers(instance);
        if (instance.ActivityType == 0 && markers.Length > 0)
            return markers[0];

        return string.Empty;
    }

    /// <summary>
    /// 获取当前工作流的所有执行人
    /// </summary>
    /// <param name="instance">运行实例</param>
    /// <returns></returns>
    public static string[] GetMarkers(FlowInstance instance)
    {
        if (instance.IsCompleted)
            return [];

        return instance.MakerList.Split(',', StringSplitOptions.RemoveEmptyEntries);
    }

    public DataResult<List<FlowInstanceRes>> GetListByPage(PageRequest request)
    {
        //序列化查询条件
        var whereList = request.GetConditionalModels(Db);

        var data = Db.Queryable<FlowInstance>().Where(a => a.MakerList == "1" || a.MakerList.Contains(User.UserId))
            .LeftJoin<SysPermission>((a, b) => a.PermissionId == b.Id)
            .Select((a, b) => new FlowInstanceRes
            {
                CreateTime = a.CreateTime,
            }, true)
            .Where(whereList).ToQueryPage(request.PageCondition);
        return data;
    }

    public DataResult EditFlowInstance(FlowInstanceReq req)
    {
        if (req.Id == 0)
        {
            return DataResult.Failed("非法请求!", MultiLanguageConst.IllegalRequest);
        }
        else
        {

            var info = Db.Queryable<FlowInstance>().Where(x => x.Id == req.Id).First();
            if (!(info.FlowStatus == FlowStatusEnum.Draft || info.FlowStatus == FlowStatusEnum.Ready))
            {
                return DataResult.Failed("只能修改【就绪】和【撤销】状态的流程", MultiLanguageConst.FlowEditOnlyReadyAndCancel);
            }
            info = req.Adapt(info);

            Db.Updateable(info).IgnoreColumns(ignoreAllNullColumns: true).ExecuteCommand();
            return DataResult.Successed("更新成功!", MultiLanguageConst.DataUpdateSuccess);
        }
    }

    protected virtual FlowInstance? BuildInstance(CreateFlowInstanceReq req)
    {
        if (string.IsNullOrEmpty(req.TemplateId.ToString()))
            return null;

        FlowTemplate template = Db.Queryable<FlowTemplate>().First(x => x.Id == req.TemplateId);

        return template == null ? null : new FlowInstance
        {
            CustomName = template.Name,
            TemplateId = template.Id,
            BusinessId = req.BusinessId,
            BusinessType = req.BusinessType,
            PermissionId = template.PermissionId,
            ColumnView = template.ColumnView,
            Content = template.Content,
            MarkerNotifyURL = template.MakerNotifyURL,
            CallbackURL = template.CallbackURL,
            AuditType = template.AuditType
        };
    }

    /// <summary>
    /// 创建工作流实例
    /// </summary>
    /// <param name="req"></param>
    /// <returns></returns>
    public DataResult CreateFlowInstance(CreateFlowInstanceReq req)
    {
        var instance = BuildInstance(req);
        if (instance == null)
            return DataResult.Failed("该流程模板已不存在，请重新设计流程!", MultiLanguageConst.FlowTemplateNotExist);

        var userName = Db.Queryable<SysUser>().Where(x => x.Id == long.Parse(User.UserId)).Select(x => x.UserName).First();

        //创建运行实例
        var runtime = CreateRuntimeService(instance);
        if (runtime.ShouldSkip)
        {
            instance.FlowStatus = FlowStatusEnum.Approve;
            instance.Note = "已设置为自动跳过工作流执行";
            Db.Insertable(instance).ExecuteCommand();

            var history1 = new FlowInstanceHistory
            {
                InstanceId = instance.Id,
                Content = "【创建】"
                      + userName
                      + "创建了一个流程进程【"
                      + instance.CustomName + "】",
                UserName = userName
            };

            var history2 = new FlowInstanceHistory
            {
                InstanceId = instance.Id,
                Content = "【审核】"
                      + userName
                      + "流程条件触发自动审核【"
                      + instance.CustomName + "】",
                UserName = userName
            };

            FlowInstanceHistory[] histories = [history1, history2];
            Db.Insertable(histories).ExecuteCommand();

            if (!string.IsNullOrEmpty(instance.CallbackURL))
                Task.Factory.StartNew(() => RunCallbackAsync(instance));

            var result = DataResult.Successed("创建工作流实例成功!", instance, MultiLanguageConst.FlowInstanceCreateSuccess);
            return result;
        }

        if (runtime.CurrentNode is { AssigneeType: "user", Users.Count: > 0 })
        {
            if (!runtime.CurrentNode.Users.Contains(User.UserId))
            {
                return DataResult.Failed("该工作流指定用户非本人，没有发起审批的权限", MultiLanguageConst.FlowInstanceAssignUser);
            }
        }

        if (runtime.CurrentNode is { AssigneeType: "role", Roles.Count: > 0 })
        {
            var userRoles = Db.Queryable<SysRoleUser>().Where(x => x.UserId == long.Parse(User.UserId))
                .Select(n => n.RoleId.ToString()).ToList();
            var intersectRoles = runtime.CurrentNode.Roles.Intersect(userRoles).ToList();
            if (intersectRoles.Count == 0)
            {
                return DataResult.Failed("该工作流指定角色非本人，没有发起审批的权限", MultiLanguageConst.FlowInstanceAssignRole);
            }
        }

        #region 根据运行实例改变当前节点状态

        instance.ActivityId = runtime.CurrentNodeId;
        instance.ActivityType = runtime.GetNodeType(runtime.StartNodeId);
        instance.ActivityName = runtime.CurrentNode.Name;
        instance.PreviousId = "";
        instance.MakerList = GetCurrentMakers(runtime);
        instance.FlowStatus = FlowStatusEnum.Ready;

        #endregion 根据运行实例改变当前节点状态

        Db.Insertable(instance).ExecuteCommand();

        //流程==4为结束，执行回调URL
        if (runtime.GetNextNodeType() == 4 && !instance.CallbackURL.IsNullOrEmpty())
        {
            Task.Factory.StartNew(() => RunCallbackAsync(instance));
        }


        var history = new FlowInstanceHistory
        {
            InstanceId = instance.Id,
            Content = "【创建】"
                      + userName
                      + "创建了一个流程进程【"
                      + instance.CustomName + "】",
            UserName = userName
        };
        Db.Insertable(history).ExecuteCommand();

        return DataResult.Successed("创建工作流实例成功!", instance, MultiLanguageConst.FlowInstanceCreateSuccess);
    }

    /// <summary>
    /// 撤销
    /// </summary>
    /// <param name="req"></param>
    /// <returns></returns>
    public DataResult WithdrawFlowInstance(CancelFlowInstanceReq req)
    {
        var instance = Db.Queryable<FlowInstance>().First(x => x.Id == req.Id);
        if (instance == null)
        {
            return DataResult.Failed("该工作流不存在!", MultiLanguageConst.FlowInstanceNotExist);
        }

        if (instance.FlowStatus == FlowStatusEnum.Approve)
        {
            return DataResult.Failed("该工作流已完成!", MultiLanguageConst.FlowInstanceFinished);
        }

        instance.ActivityId = "";
        //创建运行实例
        var wfruntime = CreateRuntimeService(instance);
        wfruntime.Cancel();

        #region 根据运行实例改变当前节点状态

        string startNodeId = wfruntime.StartNodeId; //起始节点
        instance.PreviousId = instance.ActivityId;
        instance.ActivityId = startNodeId;
        instance.ActivityType = wfruntime.GetNodeType(startNodeId);
        instance.ActivityName = wfruntime.ChildNodes.First(x => x.Id == startNodeId).Name;
        instance.MakerList = wfruntime.GetNextNodeType() != 4 ? GetCurrentMakers(wfruntime) : "1";
        instance.FlowStatus = FlowStatusEnum.Draft;

        #endregion 根据运行实例改变当前节点状态
        var serializerSettings = new JsonSerializerSettings
        {
            // 设置为驼峰命名
            ContractResolver = new Newtonsoft.Json.Serialization.CamelCasePropertyNamesContractResolver()
        };
        instance.Content = JsonConvert.SerializeObject(wfruntime.ToFlowRoot(), Formatting.None, serializerSettings);
        Db.Updateable(instance).ExecuteCommand();

        var userInfo = Db.Queryable<SysUser>().First(x => x.Id == long.Parse(User.UserId));
        var history = new FlowInstanceHistory
        {
            InstanceId = instance.Id,
            Content = $"【撤销】由{userInfo.UserName}撤销,备注：{req.Note}",
            Result = -1,
            UserName = userInfo.UserName
        };
        Db.Insertable(history).ExecuteCommand();
        return DataResult.Successed("撤销成功!", MultiLanguageConst.FlowInstanceCancelSuccess);
    }

    /// <summary>
    /// 获取流程操作历史
    /// </summary>
    /// <param name="id"></param>
    /// <returns></returns>
    public DataResult<List<FlowInstanceHistoryRes>> GetFlowInstanceHistoryList(string id)
    {
        var data = Db.Queryable<FlowInstanceHistory>()
            .Where(a => a.InstanceId == long.Parse(id))
            .Select<FlowInstanceHistoryRes>()
            .ToList();
        return DataResult<List<FlowInstanceHistoryRes>>.Success(data);
    }

    /// <summary>
    /// 启动
    /// </summary>
    /// <param name="id"></param>
    /// <returns></returns>
    public DataResult StartFlowInstance(string id)
    {
        var instance = Db.Queryable<FlowInstance>().First(x => x.Id == long.Parse(id));
        if (instance == null)
        {
            return DataResult.Failed("该工作流不存在!", MultiLanguageConst.FlowInstanceNotExist);
        }

        if (instance.FlowStatus == FlowStatusEnum.Approve)
        {
            return DataResult.Failed("该工作流已完成!", MultiLanguageConst.FlowInstanceFinished);
        }

        //创建运行实例
        var wfruntime = CreateRuntimeService(instance);

        #region 根据运行实例改变当前节点状态

        instance.ActivityId = wfruntime.NextNodeId;
        instance.ActivityType = wfruntime.GetNextNodeType();
        instance.ActivityName = wfruntime.NextNode.Name;
        instance.PreviousId = wfruntime.CurrentNodeId;
        instance.MakerList = wfruntime.GetNextNodeType() != 4 ? GetNextMakers(wfruntime) : "1";
        instance.FlowStatus = (wfruntime.GetNextNodeType() == 4 ? FlowStatusEnum.Approve : FlowStatusEnum.Running);

        #endregion 根据运行实例改变当前节点状态

        Db.Updateable(instance).ExecuteCommand();

        //流程==4为结束，执行回调URL
        if (wfruntime.GetNextNodeType() == 4 && !instance.CallbackURL.IsNullOrEmpty())
        {
            Task.Factory.StartNew(() => RunCallbackAsync(instance));
        }

        var userInfo = Db.Queryable<SysUser>().First(x => x.Id == long.Parse(User.UserId));
        var history = new FlowInstanceHistory
        {
            InstanceId = instance.Id,
            Content = $"【启动】由{userInfo.UserName}启动该流程。",
            UserName = userInfo.UserName
        };
        Db.Insertable(history).ExecuteCommand();
        return DataResult.Successed("更新成功!", instance, MultiLanguageConst.FlowInstanceUpdateSuccess);
    }

    /// <summary>
    /// 审核工作流实例
    /// </summary>
    /// <param name="req"></param>
    /// <returns></returns>
    public DataResult AuditFlowInstance(FlowInstanceAuditReq req)
    {
        var instance = GetFlowInstance(req.Id);

        if (instance == null)
        {
            return DataResult.Failed("该工作流不存在!", MultiLanguageConst.FlowInstanceNotExist);
        }
        else if (instance.FlowStatus == FlowStatusEnum.Approve)
        {
            return DataResult.Failed("该工作流已完成!", MultiLanguageConst.FlowInstanceFinished);
        }

        return AuditFlowCore(req.Status, req.AuditNote, instance);
    }

    /// <summary>
    /// 工作流实例审核实现
    /// </summary>
    /// <param name="status"></param>
    /// <param name="auditNote"></param>
    /// <param name="instance"></param>
    /// <returns></returns>
    protected virtual DataResult AuditFlowCore(int status, string auditNote, FlowInstance instance)
    {
        ArgumentNullException.ThrowIfNull(instance, nameof(instance));

        if (!instance.MakerList.Contains(User.UserId))
            return DataResult.FailedWithDesc(nameof(MultiLanguageConst.AuditUnauthorization));

        var tag = new FlowTag
        {
            UserName = User.UserName,
            UserId = User.UserId,
            Description = auditNote,
            Taged = status
        };

        var runtime = CreateRuntimeService(instance);

        if (runtime.CurrentNodeId != instance.ActivityId)
            return DataResult.Failed("该工作流审批节点与当前节点不一致!", MultiLanguageConst.FlowInstanceNodeIdConflict);

        #region 会签

        if (instance.ActivityType == 0) //当前节点是会签节点
        {
            //会签时的【当前节点】一直是会签开始节点
            runtime.MakeTagNode(runtime.CurrentNodeId, tag); //标记审核节点状态

            var res = runtime.NodeConfluence(runtime.CurrentNodeId, tag);
            if (res == ((int)TagState.No).ToString()) //驳回
            {
                instance.FlowStatus = FlowStatusEnum.Reject;
                if (runtime.NextNodeType == 4)
                {
                    instance.PreviousId = instance.ActivityId;
                    instance.ActivityId = runtime.NextNodeId;
                    instance.ActivityType = runtime.NextNodeType;
                    instance.ActivityName = runtime.NextNode.Name;
                    instance.MakerList = runtime.NextNodeType == 4 ? string.Empty : GetNextMakers(runtime);
                }
            }
            else if (!string.IsNullOrEmpty(res)) //通过
            {
                if (runtime.NextNodeType == 5)
                {
                    instance.MakerList = runtime.GetOtherUsers(tag);
                }
                else
                {
                    instance.PreviousId = instance.ActivityId;
                    instance.ActivityId = runtime.NextNodeId;
                    instance.ActivityType = runtime.NextNodeType;
                    instance.ActivityName = runtime.NextNode.Name;
                    instance.FlowStatus = runtime.NextNodeType == 4 ? FlowStatusEnum.Approve : FlowStatusEnum.Running;
                    instance.MakerList = runtime.NextNodeType == 4 ? string.Empty : GetNextMakers(runtime);
                }
            }
            else //继续审批
            {
                //会签过程中，需要更新用户
                instance.MakerList = GetForkNodeMakers(runtime, runtime.CurrentNodeId);
            }

            var marker = GetNextMarkers(instance);
            //获取会签下一执行人，进行通知
            if (!string.IsNullOrEmpty(marker) && !instance.MarkerNotifyURL.IsNullOrEmpty())
            {
                Task.Factory.StartNew(() => NotifyMarkerChangedAsync(status, instance, long.Parse(marker)));
            }

        }

        #endregion 会签

        #region 或签

        else
        {
            runtime.MakeTagNode(runtime.CurrentNodeId, tag);
            if (tag.Taged == (int)TagState.Ok)
            {
                instance.PreviousId = instance.ActivityId;
                instance.ActivityId = runtime.NextNodeId;
                instance.ActivityType = runtime.NextNodeType;
                instance.ActivityName = runtime.NextNode.Name;
                instance.MakerList = runtime.NextNodeType == 4 ? "1" : GetNextMakers(runtime);
                instance.FlowStatus = runtime.NextNodeType == 4 ? FlowStatusEnum.Approve : FlowStatusEnum.Running;
            }
            else
            {
                instance.FlowStatus = FlowStatusEnum.Reject; //表示该节点不同意
                runtime.NextNodeId = string.Empty;
                runtime.NextNodeType = 4;
            }
        }

        #endregion 或签

        int nextNodeType = runtime.GetNextNodeType();
        //var serializerSettings = new JsonSerializerSettings
        //{
        //    // 设置为驼峰命名
        //    ContractResolver = new Newtonsoft.Json.Serialization.CamelCasePropertyNamesContractResolver()
        //};
        //instance.Content = JsonConvert.SerializeObject(runtime.ToFlowRoot(), Formatting.None, serializerSettings);
        instance.Note = auditNote;
        Db.Updateable(instance).ExecuteCommand();

        //流程=4为结束，执行回调URL
        if (runtime.NextNodeType != 5 && (nextNodeType == 4 || nextNodeType == -1) && !instance.CallbackURL.IsNullOrEmpty())
            Task.Factory.StartNew(() => RunCallbackAsync(instance));

        var userId = long.Parse(User.UserId);
        var userInfo = Db.Queryable<SysUser>().Where(x => x.Id == userId).Select(x => new { x.Id, x.UserName }).First();
        var history = new FlowInstanceHistory
        {
            InstanceId = instance.Id,
            Content = "【" + runtime.CurrentNode.Name
                          + "】【" + DateTime.Now.ToString("yyyy-MM-dd HH:mm")
                          + "】" + (tag.Taged == 1 ? "同意" : "不同意") + ",备注："
                          + tag.Description,
            UserName = userInfo?.UserName,
            Result = status,
            Note = auditNote
        };
        Db.Insertable(history).ExecuteCommand();

        return DataResult.Successed("审批成功!", MultiLanguageConst.FlowInstanceAuditSuccess);
    }


    /// <summary>
    /// 运行执行人变更回调
    /// </summary>
    /// <param name="status">审批结果</param>
    /// <param name="instance">运行实例</param>
    /// <param name="nextUserId">下一执行人ID</param>
    /// <returns></returns>
    protected virtual async Task NotifyMarkerChangedAsync(int status, FlowInstance instance, params long[] nextUserId)
    {
        ArgumentNullException.ThrowIfNull(instance, nameof(instance));

        //请求参数设置
        var callback = new MarkerChangedCallback
        {
            InstanceId = instance.Id,
            BusinessId = instance.BusinessId,
            BusinessType = instance.BusinessType,
            AuditType = instance.AuditType,
            Status = status == 1 ? FlowStatusEnum.Approve : FlowStatusEnum.Reject,
            NextUserId = nextUserId
        };

        if (api.DefaultHeaders.Contains("Authorization"))
            api.DefaultHeaders.Remove("Authorization");

        api.DefaultHeaders.Add("Authorization", "Bearer " + User.GetToken());
        await api.PostAsync<DataResult>(instance.MarkerNotifyURL, callback);
    }

    /// <summary>
    /// 对指定的回调URL发起异步请求
    /// </summary>
    /// <param name="instance">运行实例</param>
    protected virtual async Task RunCallbackAsync(FlowInstance instance)
    {
        ArgumentNullException.ThrowIfNull(instance, nameof(instance));

        if (instance.CallbackURL.IsNullOrEmpty())
            return;

        //请求参数设置
        var callback = new FlowCallback
        {
            InstanceId = instance.Id,
            BusinessId = instance.BusinessId,
            BusinessType = instance.BusinessType,
            AuditType = instance.AuditType,
            FlowStatus = instance.FlowStatus,
            RejectReason = instance.Note
        };

        if (api.DefaultHeaders.Contains("Authorization"))
            api.DefaultHeaders.Remove("Authorization");

        api.DefaultHeaders.Add("Authorization", "Bearer " + User.GetToken());
        var result = await api.PostAsync<DataResult>(instance.CallbackURL, callback);
        if (result.Succeeded)
        {
            //更新回调执行标识
            await Db.Updateable<FlowInstance>().SetColumns(it => it.IsCallbackExecuted == true)
                .Where(it => it.Id == instance.Id).ExecuteCommandAsync();
        }
    }

    /// <summary>
    /// 运行回调更新
    /// </summary>
    /// <param name="bsId">业务ID</param>
    /// <param name="businessType">业务类型</param>
    /// <param name="callbackURL">回调URL</param>
    /// <returns></returns>
    public async Task<DataResult> RunCallbackAsync(long bsId, BusinessType? businessType = null, string? callbackURL = null)
    {
        var instance = await Db.Queryable<FlowInstance>().Where(x => x.BusinessId == bsId && x.BusinessType == businessType)
            .InnerJoin<FlowTemplateTenant>((f, ft) => f.TemplateId == ft.Id).Select((f, ft) => new FlowInstance
            {
                BusinessId = f.BusinessId,
                BusinessType = f.BusinessType,
                CallbackURL = ft.CallbackURL,
                MarkerNotifyURL = ft.MarkerNotifyURL,
                FlowStatus = f.FlowStatus,
                Id = f.Id,
                AuditType = ft.AuditType
            }).FirstAsync();

        if (instance == null)
            return DataResult.FailedWithDesc(MultiLanguageConst.EmptyData);

        if (!string.IsNullOrEmpty(callbackURL))
            instance.CallbackURL = callbackURL;

        await RunCallbackAsync(instance);
        return DataResult.Success;
    }

    /// <summary>
    /// 获取运行实例信息
    /// </summary>
    /// <param name="id"></param>
    /// <returns></returns>
    public FlowInstance GetFlowInstance(long id)
    {
        return Db.Queryable<FlowInstance>().Where(x => x.Id == id)
            .InnerJoin<FlowTemplateTenant>((f, ft) => f.TemplateId == ft.Id).Select((f, ft) => new FlowInstance
            {
                ActivityId = f.ActivityId,
                ActivityName = f.ActivityName,
                ActivityType = f.ActivityType,
                BusinessId = f.BusinessId,
                BusinessType = f.BusinessType,
                CallbackURL = ft.CallbackURL,
                MarkerNotifyURL = ft.MarkerNotifyURL,
                ColumnView = f.ColumnView,
                Content = f.Content,
                FlowStatus = f.FlowStatus,
                Id = f.Id,
                MakerList = f.MakerList,
                PreviousId = f.PreviousId,
                PermissionId = f.PermissionId,
                AuditType = ft.AuditType
            }).First();
    }

    protected virtual FlowRuntime CreateRuntimeService(FlowInstance instance)
    {
        return new FlowRuntime(instance, Db, null, User);
    }

    public DataResult<FlowInstanceRes> GetFlowInstanceInfo(string id)
    {
        var data = Db.Queryable<FlowInstance>()
            // .LeftJoin<SysPermission>((a, b) => a.PermissionId == b.Id)
            .Where(a => a.Id == long.Parse(id))
            .Select<FlowInstanceRes>()
            .First();
        return DataResult<FlowInstanceRes>.Success(data);
    }

    /// <summary>
    /// 寻找下一步的执行人
    /// 一般用于本节点审核完成后，修改流程实例的当前执行人，可以做到通知等功能
    /// </summary>
    /// <returns></returns>
    protected string GetCurrentMakers(FlowRuntime wfruntime, CreateFlowInstanceReq request = null)
    {
        string makerList = "";
        if (wfruntime.NextNodeId == "-1")
        {
            throw (new Exception("无法寻找到下一个节点"));
        }

        if (wfruntime.CurrentNodeType == 0) //如果是会签节点
        {
            makerList = GetForkNodeMakers(wfruntime, wfruntime.NextNodeId);
        }
        else if (wfruntime.CurrentNode.AssigneeType == "role")
        {
            var users = Db.Queryable<SysRoleUser>().Where(x =>
                    wfruntime.CurrentNode.Roles.Contains(x.RoleId.ToString()))
                .Select(x => x.UserId).Distinct().ToList();

            makerList = string.Join(',', users);
        }
        else if (wfruntime.CurrentNode.AssigneeType == "user")
        {
            makerList = string.Join(",", wfruntime.CurrentNode.Users);
        }
        else
        {
            makerList = GetNodeMarkers(wfruntime.CurrentNode);
            if (string.IsNullOrEmpty(makerList))
            {
                throw (new Exception("无法寻找到节点的审核者,请查看流程设计是否有问题!"));
            }
        }

        return makerList;
    }

    /// <summary>
    /// 寻找下一步的执行人
    /// 一般用于本节点审核完成后，修改流程实例的当前执行人，可以做到通知等功能
    /// </summary>
    /// <returns></returns>
    protected string GetNextMakers(FlowRuntime wfruntime, CreateFlowInstanceReq request = null)
    {
        string makerList = "";
        if (wfruntime.NextNodeId == "-1")
        {
            throw new Exception("无法寻找到下一个节点");
        }

        // if (wfruntime.NextNodeType == 0) //如果是会签节点
        // {
        //     makerList = GetForkNodeMakers(wfruntime, wfruntime.NextNodeId);
        // } else
        if (wfruntime.NextNode.AssigneeType == "role")
        {
            var users = Db.Queryable<SysRoleUser>().Where(x =>
                    wfruntime.NextNode.Roles.Contains(x.RoleId.ToString()))
                .Select(x => x.UserId).Distinct().ToList();
            makerList = string.Join(",", users);
        }
        else if (wfruntime.NextNode.AssigneeType == "user")
        {
            makerList = string.Join(",", wfruntime.NextNode.Users);
        }
        else
        {
            makerList = GetNodeMarkers(wfruntime.NextNode);
            if (string.IsNullOrEmpty(makerList))
            {
                throw new Exception("无法寻找到节点的审核者,请查看流程设计是否有问题!");
            }
        }

        return makerList;
    }

    /// <summary>
    /// 获取会签开始节点的所有可执行者
    /// </summary>
    /// <param name="forkNodeId">会签开始节点</param>
    /// <returns></returns>
    protected virtual string GetForkNodeMakers(FlowRuntime wfruntime, string forkNodeId)
    {
        string makerList = "";

        var nextNode = wfruntime.NextNode;

        var nextConditionNodeId = wfruntime.GetNextConditionNodeId(nextNode);
        var nextConditionNode = wfruntime.ChildNodes.First(x => x.Id == nextConditionNodeId);
        if (nextConditionNode.AssigneeType == "role")
        {
            var users = Db.Queryable<SysRoleUser>().Where(x =>
                    nextConditionNode.Roles.Contains(x.RoleId.ToString()))
                .Select(x => x.UserId).Distinct().ToList();
            makerList = string.Join(",", users);
        }
        else if (nextConditionNode.AssigneeType == "user")
        {
            makerList = string.Join(",", nextConditionNode.Users);
        }
        // foreach (string fromForkStartNodeId in wfruntime.FromNodeLines[forkNodeId].Select(u => u.to))
        // {
        //     var fromForkStartNode = wfruntime.Nodes[fromForkStartNodeId]; //与会前开始节点直接连接的节点
        //     if (makerList != "")
        //     {
        //         makerList += ",";
        //     }
        //
        //     makerList += GetOneForkLineMakers(fromForkStartNode, wfruntime);
        // }

        return makerList;
    }

    /// <summary>
    /// 寻找该节点执行人
    /// </summary>
    /// <param name="node"></param>
    /// <returns></returns>
    protected string GetNodeMarkers(FlowChild node, string flowinstanceCreateUserId = "")
    {
        string makerList = "";
        if (node.Type == FlowChild.START && (!string.IsNullOrEmpty(flowinstanceCreateUserId))) //如果是开始节点，通常情况下是驳回到开始了
        {
            makerList = flowinstanceCreateUserId;
        }
        else if (node.AssigneeType != null)
        {
            if (node.AssigneeType == "role")
            {
                var users = Db.Queryable<SysRoleUser>().Where(x =>
                        node.Roles.Contains(x.RoleId.ToString()))
                    .Select(x => x.UserId).Distinct().ToList();
                makerList = string.Join(",", users);
            }
            else if (node.AssigneeType == "user")
            {
                makerList = node.Users.ToString();
            }
        }
        else //如果没有设置节点信息，默认所有人都可以审核
        {
            makerList = "1";
        }

        return makerList;
    }
}