[PoC] feat: add Endpoint Discovery

[trivikr]

Issue

PoC for #2211

Description

PoC for Endpoint Discovery in AWS SDK for JavaScript (v3)

Testing

Tested with the following code:

import { TimestreamQuery } from "../aws-sdk-js-v3/clients/client-timestream-query/dist/cjs/index.js";

const region = "us-west-2";
const client = new TimestreamQuery({ region, logger: console });

const DatabaseName = `Database1619998684282`;
const TableName = `Table1619998684282`;
const QueryString = `SELECT * FROM ${DatabaseName}.${TableName} ORDER BY time`;

await Promise.all([
  client.query({ QueryString }),
  client.query({ QueryString: `${QueryString} LIMIT 2` }),
  client.query({ QueryString: `${QueryString} LIMIT 5` }),
]);

Verified that discovery endpoint operation (i.e. DescribeEndpoints) is called only once although there are three parallel query calls.

{
  clientName: 'TimestreamQueryClient',
  commandName: 'DescribeEndpointsCommand',
  input: { Operation: 'Query', Identifiers: undefined },
  output: { Endpoints: [ [Object] ] },
  metadata: {
    httpStatusCode: 200,
    requestId: '32384c2d-e075-492e-8d9a-02d4cd21fe69',
    extendedRequestId: undefined,
    cfId: undefined,
    attempts: 1,
    totalRetryDelay: 0
  }
}
{
  clientName: 'TimestreamQueryClient',
  commandName: 'QueryCommand',
  input: { QueryString: '***SensitiveInformation***' },
  output: {
    ColumnInfo: [ [Object], [Object], [Object], [Object], [Object], [Object] ],
    NextToken: undefined,
    QueryId: 'AEDACAM4AC55UWHUXUYJ4JBU7VT76KSI5RM47JCDJYSIAN5VXANLIJG3QK24XEY',
    QueryStatus: {
      CumulativeBytesMetered: 10000000,
      CumulativeBytesScanned: 1048,
      ProgressPercentage: 100
    },
    Rows: [
      [Object], [Object],
      [Object], [Object],
      [Object], [Object],
      [Object], [Object],
      [Object], [Object],
      [Object], [Object],
      [Object], [Object],
      [Object], [Object]
    ]
  },
  metadata: {
    httpStatusCode: 200,
    requestId: 'K6W27XSYKRL7HD36HOW5WTWTUE',
    extendedRequestId: undefined,
    cfId: undefined,
    attempts: 1,
    totalRetryDelay: 0
  }
}
{
  clientName: 'TimestreamQueryClient',
  commandName: 'QueryCommand',
  input: { QueryString: '***SensitiveInformation***' },
  output: {
    ColumnInfo: [ [Object], [Object], [Object], [Object], [Object], [Object] ],
    NextToken: undefined,
    QueryId: 'AEDACAM4AC5YR3ZREISR2NVE723ZZENOCEU4HKFCT4REEANXSZ5ITP7RCD47PGI',
    QueryStatus: {
      CumulativeBytesMetered: 10000000,
      CumulativeBytesScanned: 1048,
      ProgressPercentage: 100
    },
    Rows: [ [Object], [Object] ]
  },
  metadata: {
    httpStatusCode: 200,
    requestId: 'AJSTGRM3WS4UTI7CDAQYPQF5WE',
    extendedRequestId: undefined,
    cfId: undefined,
    attempts: 1,
    totalRetryDelay: 0
  }
}
{
  clientName: 'TimestreamQueryClient',
  commandName: 'QueryCommand',
  input: { QueryString: '***SensitiveInformation***' },
  output: {
    ColumnInfo: [ [Object], [Object], [Object], [Object], [Object], [Object] ],
    NextToken: undefined,
    QueryId: 'AEDACAM4AC5RFCPYGQPYPGWSOSAR7A54WJ2FBWOEZ2EQIAHOOXGYGUXX6EJS6NA',
    QueryStatus: {
      CumulativeBytesMetered: 10000000,
      CumulativeBytesScanned: 1048,
      ProgressPercentage: 100
    },
    Rows: [ [Object], [Object], [Object], [Object], [Object] ]
  },
  metadata: {
    httpStatusCode: 200,
    requestId: '73SI4DZ4R2KESFKBFJL6KKEE4Y',
    extendedRequestId: undefined,
    cfId: undefined,
    attempts: 1,
    totalRetryDelay: 0
  }
}

---

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[trivikr]

The final PR was posted and merged at #2395

[github-actions]

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