SubscribeToShard 命令异常

Question

我正在尝试订阅来自 Kinesis Shard 的事件。 但是SubscribeToShardCommand的执行挂了5分钟（订阅超时）然后抛出错误：

(node:2667) UnhandledPromiseRejectionWarning: SyntaxError: Unexpected token  in JSON at position 0
    at JSON.parse (<anonymous>)
    at /home/mjpolak/Documents/company/project/node_modules/@aws-sdk/client-kinesis/protocols/Aws_json1_1.ts:4020:19
    at processTicksAndRejections (internal/process/task_queues.js:88:5)
    at Object.deserializeAws_json1_1SubscribeToShardCommand (/home/mjpolak/Documents/company/project/node_modules/@aws-sdk/client-kinesis/protocols/Aws_json1_1.ts:2583:21)
    at /home/mjpolak/Documents/company/project/node_modules/@aws-sdk/middleware-serde/src/deserializerMiddleware.ts:20:18
    at /home/mjpolak/Documents/company/project/node_modules/@aws-sdk/middleware-signing/src/middleware.ts:26:22
    at StandardRetryStrategy.retry (/home/mjpolak/Documents/company/project/node_modules/@aws-sdk/middleware-retry/src/defaultStrategy.ts:125:38)
    at /home/mjpolak/Documents/company/project/node_modules/@aws-sdk/middleware-logger/src/loggerMiddleware.ts:21:20
    at /home/mjpolak/Documents/company/project/kinesis-subscribe.ts:85:29

我正在寻求帮助以使我能够成功订阅。

完整代码：

const { StreamDescription } = await client.send(
        new DescribeStreamCommand({
            StreamName: 'streamName',
        }),
    );
    const { StreamARN } = StreamDescription;

    const { Consumers } = await client.send(
        new ListStreamConsumersCommand({
            StreamARN,
        }),
    );

    let Consumer = Consumers.find((x) => x.ConsumerName == 'tester');

    if (Consumer == null) {
        const consumerData = await client.send(
            new RegisterStreamConsumerCommand({
                ConsumerName: 'tester',
                StreamARN,
            }),
        );
        Consumer = consumerData.Consumer;
    }

    console.log(`StreaARM: ${StreamARN}`);

    console.log(`Consumer: ${Consumer.ConsumerARN}`);

    const { EventStream } = await client.send(
        new SubscribeToShardCommand({
            ConsumerARN: Consumer.ConsumerARN,
            ShardId: 'shardId-000000000000',
            StartingPosition: {
                Type: 'LATEST'
            },
        }),
    );
    console.log("Consuming");

通过调查通过 Wireshark 进行的通信，我可以确认 HTTP 连接已建立，并且 AWS 将一些数据推送到我的客户端。所以我猜测客户端库中存在某种错误，它保存块而不是返回结果。

我还在 SDK 存储库中创建了错误： https://github.com/aws/aws-sdk-js-v3/issues/2418

Answer 1

日志显示 JSON 解析会引发错误，当您收到 HTML 或 XML 格式的响应但预期是 JSON 响应时会发生这种情况。尝试在控制台上记录响应并查看其格式是否正确。