问题描述
我正在尝试从 Kinesis Shard 订阅事件。
但是 SubscribetoShardCommand
的执行挂起 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 Wireshark 的通信,我可以确认 HTTP 连接已建立,并且 AWS 向我的客户端推送了一些数据。因此,我猜测客户端库中存在某种错误,即保留块而不是返回结果。
我还在 SDK 存储库上创建了错误: https://github.com/aws/aws-sdk-js-v3/issues/2418
解决方法
日志显示 JSON 解析出错,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,看看它的格式是否正确。