从 DynamoDB 获取项目时出错 - 将循环结构转换为 JSON

Question

仅当我尝试从 DB 获取记录时才出现错误，它适用于 PUT。 我已经检查了与此相关的其他票证，但那些提到这是一个异步/等待错误。 但我已经对它们进行了彻底的测试，它适用于 PUT function。

错误

2022-08-29T01:48:32.291Z    6f286581-97c9-44f8-952b-1570a7a1fac1    ERROR   Invoke Error    {
    "errorType": "TypeError",
    "errorMessage": "Converting circular structure to JSON\n    --> starting at object with constructor 'IncomingMessage'\n    |     property 'req' -> object with constructor 'ClientRequest'\n    --- property 'res' closes the circle",
    "stack": [
        "TypeError: Converting circular structure to JSON",
        "    --> starting at object with constructor 'IncomingMessage'",
        "    |     property 'req' -> object with constructor 'ClientRequest'",
        "    --- property 'res' closes the circle",
        "    at JSON.stringify (<anonymous>)",
        "    at Runtime.triggerNotificationHandler [as handler] (/var/task/index.js:52858:23)",
        "    at processTicksAndRejections (internal/process/task_queues.js:95:5)"
    ]
}

获取代码以从数据库中获取任务

fetchTasks(entity: Entity, type: string) {
    return this.client.send(
      new QueryCommand({
        TableName: this.tableName,
        KeyConditionExpression: 'PK = :pk and type= :type',
        ExpressionAttributeValues: {
          ':pk': `${entity.entityType}#${entity.PK}`,
          ':type': type
        },
      })
    );
}

PUT 代码创建任务

scheduleTask(entity: Entity, details: any, type: string) {
    return this.client.send(
      new PutCommand({
        TableName: this.tableName,
        Item: this.toDBItem(entity, details, type),
      })
    );
}

DynamoDB 获取和创建的表策略

const tablePolicyStatement = new iam.PolicyStatement({
  effect: iam.Effect.ALLOW,
  actions: [
    "dynamodb:BatchGetItem",
    "dynamodb:BatchWriteItem",
    "dynamodb:DeleteItem",
    "dynamodb:GetItem",
    "dynamodb:GetRecords",
    "dynamodb:GetShardIterator",
    "dynamodb:PutItem",
    "dynamodb:Query",
    "dynamodb:Scan",
    "dynamodb:UpdateItem",
  ],
  resources: [props.tableArn, `${props.tableArn}/index/*`],
});

Lambda function 触发 cron 并调用 DB 获取方法

const triggerNotificationHandler = new EventBridgeFunction(
  this,
  "TriggerNotification",
  {
    schedule: events.Schedule.expression("rate(5 minutes)"), // test cron
    // schedule: events.Schedule.expression('rate(1 hour)'), // run every hour
    functionProps: {
      ...commonHandlerProps,
      functionName: `trigger-${props.stage}-notification-cron`,
      handler: "triggerNotificationHandler",
    },
  }
);
triggerNotificationHandler.func.addToRolePolicy(tablePolicyStatement);

我也尝试过这些权限，而 grantReadWriteData 是我用来创建记录的

table.grantReadWriteData(triggerNotificationHandler.func);
table.grantReadData(triggerNotificationHandler.func);
table.grantFullAccess(triggerNotificationHandler.func);
table.grantTableListStreams(triggerNotificationHandler.func);

表创建代码

const table = new dynamodb.Table(this, "TaskTable", {
  tableName: `my-task`,
  partitionKey: { name: "PK", type: dynamodb.AttributeType.STRING },
  sortKey: { name: "SK", type: dynamodb.AttributeType.STRING },
  billingMode: dynamodb.BillingMode.PAY_PER_REQUEST,
  pointInTimeRecovery: true,
});

table.addGlobalSecondaryIndex({
  indexName: "GSI1",
  partitionKey: { name: "SK", type: dynamodb.AttributeType.STRING },
  sortKey: { name: "PK", type: dynamodb.AttributeType.STRING },
  projectionType: dynamodb.ProjectionType.ALL,
});