Utilizzare DescribeClusters con un SDK AWS o una CLI

Ottenere una descrizione di tutti i cluster Questo esempio restituisce una descrizione di tutti i cluster per l’account. Per impostazione predefinita, l’output è in formato JSON. Comando:

aws redshift describe-clusters

Risultato:

{
   "Clusters": [
   {
      "NodeType": "dw.hs1.xlarge",
      "Endpoint": {
         "Port": 5439,
         "Address": "mycluster.coqoarplqhsn.us-east-1.redshift.amazonaws.com"
      },
      "ClusterVersion": "1.0",
      "PubliclyAccessible": "true",
      "MasterUsername": "adminuser",
      "ClusterParameterGroups": [
         {
            "ParameterApplyStatus": "in-sync",
            "ParameterGroupName": "default.redshift-1.0"
         } ],
      "ClusterSecurityGroups": [
         {
            "Status": "active",
            "ClusterSecurityGroupName": "default"
         } ],
      "AllowVersionUpgrade": true,
      "VpcSecurityGroups": \[],
      "AvailabilityZone": "us-east-1a",
      "ClusterCreateTime": "2013-01-22T21:59:29.559Z",
      "PreferredMaintenanceWindow": "sat:03:30-sat:04:00",
      "AutomatedSnapshotRetentionPeriod": 1,
      "ClusterStatus": "available",
      "ClusterIdentifier": "mycluster",
      "DBName": "dev",
      "NumberOfNodes": 2,
      "PendingModifiedValues": {}
   } ],
   "ResponseMetadata": {
      "RequestId": "65b71cac-64df-11e2-8f5b-e90bd6c77476"
   }
}

Puoi ottenere le stesse informazioni anche in formato testo utilizzando l’opzione --output text. Comando:

opzione --output text. Comando:

opzione. Comando:

aws redshift describe-clusters --output text

Risultato:

dw.hs1.xlarge       1.0     true    adminuser       True    us-east-1a      2013-01-22T21:59:29.559Z        sat:03:30-sat:04:00     1       available       mycluster       dev     2
ENDPOINT    5439    mycluster.coqoarplqhsn.us-east-1.redshift.amazonaws.com
in-sync     default.redshift-1.0
active      default
PENDINGMODIFIEDVALUES
RESPONSEMETADATA    934281a8-64df-11e2-b07c-f7fbdd006c67

import (
	"context"
	"errors"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/redshift"
	"github.com/aws/aws-sdk-go-v2/service/redshift/types"
)



// RedshiftActions wraps Redshift service actions.
type RedshiftActions struct {
	RedshiftClient *redshift.Client
}



// DescribeClusters returns information about the given cluster.
func (actor RedshiftActions) DescribeClusters(ctx context.Context, clusterId string) (*redshift.DescribeClustersOutput, error) {
	input, err := actor.RedshiftClient.DescribeClusters(ctx, &redshift.DescribeClustersInput{
		ClusterIdentifier: aws.String(clusterId),
	})
	var opErr *types.AccessToClusterDeniedFault
	if errors.As(err, &opErr) {
		println("Access to cluster denied.")
		panic(err)
	} else if err != nil {
		println("Failed to describe Redshift clusters.")
		return nil, err
	}
	return input, nil
}

Descrivi il cluster.

    /**
     * Waits asynchronously for the specified cluster to become available.
     * @param clusterId the identifier of the cluster to wait for
     * @return a {@link CompletableFuture} that completes when the cluster is ready
     */
    public CompletableFuture<Void> waitForClusterReadyAsync(String clusterId) {
        DescribeClustersRequest clustersRequest = DescribeClustersRequest.builder()
            .clusterIdentifier(clusterId)
            .build();

        logger.info("Waiting for cluster to become available. This may take a few minutes.");
        long startTime = System.currentTimeMillis();

        // Recursive method to poll the cluster status.
        return checkClusterStatusAsync(clustersRequest, startTime);
    }

    private CompletableFuture<Void> checkClusterStatusAsync(DescribeClustersRequest clustersRequest, long startTime) {
        return getAsyncClient().describeClusters(clustersRequest)
            .thenCompose(clusterResponse -> {
                List<Cluster> clusterList = clusterResponse.clusters();
                boolean clusterReady = false;
                for (Cluster cluster : clusterList) {
                    if ("available".equals(cluster.clusterStatus())) {
                        clusterReady = true;
                        break;
                    }
                }

                if (clusterReady) {
                    logger.info(String.format("Cluster is available!"));
                    return CompletableFuture.completedFuture(null);
                } else {
                    long elapsedTimeMillis = System.currentTimeMillis() - startTime;
                    long elapsedSeconds = elapsedTimeMillis / 1000;
                    long minutes = elapsedSeconds / 60;
                    long seconds = elapsedSeconds % 60;
                    System.out.printf("\rElapsed Time: %02d:%02d - Waiting for cluster...", minutes, seconds);
                    System.out.flush();

                    // Wait 1 second before the next status check
                    return CompletableFuture.runAsync(() -> {
                        try {
                            TimeUnit.SECONDS.sleep(1);
                        } catch (InterruptedException e) {
                            throw new RuntimeException("Error during sleep: " + e.getMessage(), e);
                        }
                    }).thenCompose(ignored -> checkClusterStatusAsync(clustersRequest, startTime));
                }
            }).exceptionally(exception -> {
                throw new RuntimeException("Failed to get cluster status: " + exception.getMessage(), exception);
            });
    }

Crea il client.

import { RedshiftClient } from "@aws-sdk/client-redshift";
// Set the AWS Region.
const REGION = "REGION";
//Set the Redshift Service Object
const redshiftClient = new RedshiftClient({ region: REGION });
export { redshiftClient };

Descrivi i cluster.

// Import required AWS SDK clients and commands for Node.js
import { DescribeClustersCommand } from "@aws-sdk/client-redshift";
import { redshiftClient } from "./libs/redshiftClient.js";

const params = {
  ClusterIdentifier: "CLUSTER_NAME",
};

const run = async () => {
  try {
    const data = await redshiftClient.send(new DescribeClustersCommand(params));
    console.log("Success", data);
    return data; // For unit tests.
  } catch (err) {
    console.log("Error", err);
  }
};
run();

Descrivi il cluster.

suspend fun describeRedshiftClusters() {
    RedshiftClient.fromEnvironment { region = "us-west-2" }.use { redshiftClient ->
        val clusterResponse = redshiftClient.describeClusters(DescribeClustersRequest {})
        val clusterList = clusterResponse.clusters

        if (clusterList != null) {
            for (cluster in clusterList) {
                println("Cluster database name is ${cluster.dbName}")
                println("Cluster status is ${cluster.clusterStatus}")
            }
        }
    }
}

class RedshiftWrapper:
    """
    Encapsulates Amazon Redshift cluster operations.
    """

    def __init__(self, redshift_client):
        """
        :param redshift_client: A Boto3 Redshift client.
        """
        self.client = redshift_client


    def describe_clusters(self, cluster_identifier):
        """
        Describes a cluster.

        :param cluster_identifier: The cluster identifier.
        :return: A list of clusters.
        """
        try:
            kwargs = {}
            if cluster_identifier:
                kwargs["ClusterIdentifier"] = cluster_identifier

            paginator = self.client.get_paginator("describe_clusters")
            clusters = []
            for page in paginator.paginate(**kwargs):
                clusters.extend(page["Clusters"])

            return clusters

        except ClientError as err:
            logging.error(
                "Couldn't describe a cluster. Here's why: %s: %s",
                err.response["Error"]["Code"],
                err.response["Error"]["Message"],
            )
            raise

Il codice seguente crea un’istanza dell’oggetto RedshiftWrapper.

    client = boto3.client("redshift")
    redhift_wrapper = RedshiftWrapper(client)