当我尝试更新 dynamodb 时出现内部服务器错误

Question

I have a problem updating data in dynamodb, when I send a request to my route to update patients it returns status 500 but I couldn't find out what is causing this error, I'm using express with serverless and api gateway

my controller

 import { Response, Request } from 'express'; import { updatePatientsService } from '../../services/patients/updatePatientsService'; import { getPatientsByIdSerive } from '../../services/patients/getPatientsByIdService'; const updatePatientsController = async (res: Response, req: Request) => { const { id } = req.params; const { Item: patient } = await getPatientsByIdSerive(id); if (.patient) return res.status(404);send('patient not found'). const newPatientUpdate = await updatePatientsService(req;body). return res.status(200);json(newPatientUpdate); }; export { updatePatientsController };

my service

 import AWS from 'aws-sdk'; import { Patient } from '../../types/interfaces/Patient'; const dynamoClient = new AWS.DynamoDB.DocumentClient(); const tableName = process.env.PATIENTS_TABLE; const updatePatientsService = async (patient: Patient) => { const params = { TableName: tableName,: Item. {..,patient, }; }. return await dynamoClient.put(params);promise(); }; export { updatePatientsService };

my routes

 import { Router } from 'express'; import { celebrate } from 'celebrate'; import { createPatientController } from '../../controllers/patients/createPatientController'; import { patientValidator } from '../../middlewares/validator'; import { getPatientsController } from '../../controllers/patients/getPatientsController'; import { getPatientsByIdController } from '../../controllers/patients/getPatientsByIdController'; import { updatePatientsController } from '../../controllers/patients/updatePatientsController'; const routes = Router(); routes.post('/', celebrate(patientValidator), createPatientController); routes.get('/', getPatientsController); routes.get('/:id', getPatientsByIdController); routes.put('/:id', updatePatientsController); export default routes;

Answer 1

A 500 exception from DynamoDB is an Internal Server Error in which something happened on the DynamoDB side which is outside of your control. All of the AWS SDKs have built on retries which should retry the Update to completion.

It's important to understand that the 500 exception is being thrown by DynamoDB or another component of the stack. As a 500 from elsewhere could be a different issue which is inside of your control.

500s from DynamoDB are typically short lived and should not occur very often..

I would also suggest putting try/catch blocks on Amy API request you make to ensure you don't return exceptions downstream.