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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 | 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 24x 24x 24x 9x 9x 9x 9x 1x 1x 3x 3x 3x 3x 3x 3x 3x 19x 19x 1x 18x 5x 5x 3x 2x 2x 2x 12x 12x 1x 11x 4x 7x 7x 7x 6x 1x | import {
ConflictException,
Injectable,
NotFoundException,
} from '@nestjs/common';
import { InjectRepository } from '@nestjs/typeorm';
import { DataSource, FindOptionsWhere, Repository } from 'typeorm';
import { WORK_ORDER_EVENTS, WorkOrderEventType } from '@app/contracts';
import { WorkOrderEventsOutbox } from '../messaging/work-order-events.outbox';
import { CreateWorkOrderDto } from './dto/create-work-order.dto';
import { PaginatedResult } from './dto/paginated-result';
import { QueryWorkOrdersDto } from './dto/query-work-orders.dto';
import { WorkOrder } from './work-order.entity';
import { WorkOrderStatus } from './work-order.enums';
import { canAssign, canTransition } from './work-order-transitions';
/** Which domain event each externally-triggered status change produces. */
const STATUS_EVENTS: Partial<Record<WorkOrderStatus, WorkOrderEventType>> = {
[WorkOrderStatus.IN_PROGRESS]: WORK_ORDER_EVENTS.STARTED,
[WorkOrderStatus.COMPLETED]: WORK_ORDER_EVENTS.COMPLETED,
[WorkOrderStatus.CANCELLED]: WORK_ORDER_EVENTS.CANCELLED,
};
@Injectable()
export class WorkOrdersService {
constructor(
@InjectRepository(WorkOrder)
private readonly repository: Repository<WorkOrder>,
private readonly dataSource: DataSource,
private readonly outbox: WorkOrderEventsOutbox,
) {}
/**
* State change and its event commit atomically: the entity save and the
* outbox row share one transaction, so there is no window where the state
* changed but the event was lost (the dual-write problem, closed).
*/
private saveAndStage(
workOrder: WorkOrder,
type: WorkOrderEventType,
): Promise<WorkOrder> {
return this.dataSource.transaction(async (manager) => {
const saved = await manager.save(workOrder);
await this.outbox.stage(manager, type, saved);
return saved;
});
}
create(dto: CreateWorkOrderDto): Promise<WorkOrder> {
const workOrder = this.repository.create(dto);
return this.saveAndStage(workOrder, WORK_ORDER_EVENTS.CREATED);
}
async findAll(
query: QueryWorkOrdersDto,
): Promise<PaginatedResult<WorkOrder>> {
const { page, limit, status, priority, propertyId } = query;
const where: FindOptionsWhere<WorkOrder> = {};
if (status) where.status = status;
if (priority) where.priority = priority;
if (propertyId) where.propertyId = propertyId;
const [data, total] = await this.repository.findAndCount({
where,
order: { createdAt: 'DESC' },
skip: (page - 1) * limit,
take: limit,
});
return { data, meta: { page, limit, total } };
}
async findOne(id: string): Promise<WorkOrder> {
const workOrder = await this.repository.findOneBy({ id });
if (!workOrder) {
throw new NotFoundException(`work order ${id} not found`);
}
return workOrder;
}
async assign(id: string, assigneeId: string): Promise<WorkOrder> {
const workOrder = await this.findOne(id);
if (!canAssign(workOrder.status)) {
throw new ConflictException(
`cannot assign a work order in status '${workOrder.status}'`,
);
}
workOrder.assigneeId = assigneeId;
workOrder.status = WorkOrderStatus.ASSIGNED;
return this.saveAndStage(workOrder, WORK_ORDER_EVENTS.ASSIGNED);
}
async updateStatus(id: string, next: WorkOrderStatus): Promise<WorkOrder> {
const workOrder = await this.findOne(id);
if (next === WorkOrderStatus.ASSIGNED) {
throw new ConflictException(
`'assigned' is only reachable through the assign endpoint`,
);
}
if (!canTransition(workOrder.status, next)) {
throw new ConflictException(
`invalid status transition '${workOrder.status}' -> '${next}'`,
);
}
workOrder.status = next;
const eventType = STATUS_EVENTS[next];
if (eventType) {
return this.saveAndStage(workOrder, eventType);
}
return this.repository.save(workOrder);
}
}
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