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create-task.ts
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create-task.ts
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import {Context} from '@loopback/core';
import {
ExecuteWorkflowDto,
WorkflowController,
WorkflowRepository,
} from '@sourceloop/bpmn-service';
import {ILogger, LOGGER} from '@sourceloop/core';
import {AuthenticationBindings} from 'loopback4-authentication';
import {
ICommand,
IEvent,
IOutgoingConnector,
IUserTaskService,
} from '../interfaces';
import {TaskServiceBindings} from '../keys';
import {Task} from '../models';
import {TaskRepository, TaskWorkFlowRepository} from '../repositories';
import {CamundaTaskParameters, EventType, Source, User} from '../types';
export class CreateTaskCommand implements ICommand {
topic = 'create-tasks';
parameters: CamundaTaskParameters;
logger: ILogger;
constructor(private context: Context) {
this.logger = context.getSync(LOGGER.LOGGER_INJECT);
}
async execute(): Promise<void> {
const job = this.parameters.taskService;
const variables = this.parameters.task.variables.getAll();
const tempContext = new Context(this.context);
const systemUser = await tempContext.get<User>(
TaskServiceBindings.SYSTEM_USER,
);
tempContext.bind(AuthenticationBindings.CURRENT_USER).to(systemUser);
try {
const tasksWithWorkflow = JSON.parse(variables.tasks.values) as Task[];
let createdTasks: Task[] = [];
if (tasksWithWorkflow) {
createdTasks = await this._createTasks(tasksWithWorkflow, tempContext);
}
const outgoing = this.context.getSync<IOutgoingConnector<IEvent>>(
TaskServiceBindings.OUTGOING_CONNECTOR,
);
await outgoing.publish({
key: EventType.TaskCreated,
payload: {createdTasks},
timestamp: Date.now(),
source: Source.TaskService,
});
await job.complete(this.parameters.task);
} catch (e) {
await job.handleFailure(this.parameters.task, {
errorMessage: e.message,
errorDetails: e.stack,
});
} finally {
tempContext.close();
}
}
private async _createTasks(tasks: Task[], context: Context): Promise<Task[]> {
const taskRepo = context.getSync<TaskRepository>(
'repositories.TaskRepository',
);
const taskWorkflowMappingRepo = context.getSync<TaskWorkFlowRepository>(
'repositories.TaskWorkFlowRepository',
);
let createdTasks: Task[] = [];
if (tasks.length) {
createdTasks = await taskRepo.createAll(tasks ?? []);
}
const workflowKeys = await taskWorkflowMappingRepo.find({
where: {
taskKey: {
inq: createdTasks.map(task => task.key),
},
},
});
const workflowKeyMap = new Map<string, Task[] | undefined>();
createdTasks.forEach(task => {
const workflowKey = workflowKeys.find(
key => key.taskKey === task.key,
)?.workflowKey;
if (workflowKey) {
const mappedTasks = workflowKeyMap.get(workflowKey);
if (mappedTasks) {
mappedTasks.push(task);
} else {
workflowKeyMap.set(workflowKey, [task]);
}
}
});
const promises = Array.from(workflowKeyMap.entries()).map(
([workflowKey, tsks]) =>
this._startWorkflowsForTasks(workflowKey, tsks ?? [], context),
);
await Promise.all(promises);
return createdTasks;
}
private async _startWorkflowsForTasks(
workflowKey: string,
tasks: Task[],
context: Context,
) {
const workflowCtrl = await context.get<WorkflowController>(
'controllers.WorkflowController',
);
const workflowRepo = await context.get<WorkflowRepository>(
'repositories.WorkflowRepository',
);
const taskRepo = await context.get<TaskRepository>(
'repositories.TaskRepository',
);
const userTaskService = await context.get<IUserTaskService>(
TaskServiceBindings.SUB_TASK_SERVICE,
);
const workflow = await workflowRepo.findOne({
where: {
externalIdentifier: workflowKey,
},
});
if (!workflow) {
this.logger.debug(`No workflow found for key ${workflowKey}`);
return;
}
const promises = tasks.map(async dbTask => {
const result = await workflowCtrl.startWorkflow(
workflow.id!,
new ExecuteWorkflowDto({
input: {
taskId: dbTask.id,
},
}),
);
await userTaskService.updateList(dbTask.id!, result['id']);
await taskRepo.updateById(dbTask.id!, {
externalId: result['id'],
});
});
await Promise.all(promises);
}
}