Utilisation de DescribeLogStreams avec un kit AWS SDK ou une interface de ligne de commande

La commande suivante affiche tous les flux de journaux commençant par le préfixe 2015 dans le groupe de journaux my-logs :

aws logs describe-log-streams --log-group-name my-logs --log-stream-name-prefix 2015

Sortie :

{
    "logStreams": [
        {
            "creationTime": 1433189871774,
            "arn": "arn:aws:logs:us-west-2:0123456789012:log-group:my-logs:log-stream:20150531",
            "logStreamName": "20150531",
            "storedBytes": 0
        },
        {
            "creationTime": 1433189873898,
            "arn": "arn:aws:logs:us-west-2:0123456789012:log-group:my-logs:log-stream:20150601",
            "logStreamName": "20150601",
            "storedBytes": 0
        }
    ]
}

/**
 * Before running this Java V2 code example, set up your development
 * environment, including your credentials.
 * <p>
 * For more information, see the following documentation topic:
 * <p>
 * https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/get-started.html
 */
public class CloudWatchLogQuery {
    public static void main(final String[] args) {
        final String usage = """
                Usage:
                  <logGroupName>

                Where:
                  logGroupName - The name of the log group (for example, /aws/lambda/ChatAIHandler).
                """;

        if (args.length != 1) {
            System.out.print(usage);
            System.exit(1);
        }

        String logGroupName = "/aws/lambda/ChatAIHandler" ; //args[0];
        CloudWatchLogsClient logsClient = CloudWatchLogsClient.builder()
                .region(Region.US_EAST_1)
                .build();

        describeMostRecentLogStream(logsClient, logGroupName);
    }

    /**
     * Describes and prints metadata about the most recent log stream in the specified log group.
     *
     * @param logsClient   the CloudWatchLogsClient used to interact with AWS CloudWatch Logs
     * @param logGroupName the name of the log group
     */
    public static void describeMostRecentLogStream(CloudWatchLogsClient logsClient, String logGroupName) {
        DescribeLogStreamsRequest streamsRequest = DescribeLogStreamsRequest.builder()
                .logGroupName(logGroupName)
                .orderBy(OrderBy.LAST_EVENT_TIME)
                .descending(true)
                .limit(1)
                .build();

        try {
            DescribeLogStreamsResponse streamsResponse = logsClient.describeLogStreams(streamsRequest);
            List<LogStream> logStreams = streamsResponse.logStreams();

            if (logStreams.isEmpty()) {
                System.out.println("No log streams found for log group: " + logGroupName);
                return;
            }

            LogStream stream = logStreams.get(0);
            System.out.println("Most Recent Log Stream:");
            System.out.println("  Name: " + stream.logStreamName());
            System.out.println("  ARN: " + stream.arn());
            System.out.println("  Creation Time: " + stream.creationTime());
            System.out.println("  First Event Time: " + stream.firstEventTimestamp());
            System.out.println("  Last Event Time: " + stream.lastEventTimestamp());
            System.out.println("  Stored Bytes: " + stream.storedBytes());
            System.out.println("  Upload Sequence Token: " + stream.uploadSequenceToken());

        } catch (CloudWatchLogsException e) {
            System.err.println("Failed to describe log stream: " + e.awsErrorDetails().errorMessage());
        }
    }
}