server/container/guice/elasticsearch/src/main/java/org/apache/james/modules/mailbox/ElasticSearchStartUpCheck.java

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package org.apache.james.modules.mailbox;

import java.io.IOException;

import javax.inject.Inject;

import org.apache.james.backends.opensearch.ElasticSearchConfiguration;
import org.apache.james.backends.opensearch.ReactorElasticSearchClient;
import org.apache.james.lifecycle.api.StartUpCheck;
import org.opensearch.Version;
import org.opensearch.client.RequestOptions;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ElasticSearchStartUpCheck implements StartUpCheck {

    private static final Logger LOGGER = LoggerFactory.getLogger(ElasticSearchConfiguration.class);

    private static final Version RECOMMENDED_ES_VERSION = Version.V_2_0_0;
    private static final String VERSION_CHECKING_ERROR_MESSAGE = "Error when checking ES version";

    public static final String CHECK_NAME = "ElasticSearchStartUpCheck";

    private final ReactorElasticSearchClient client;

    @Inject
    private ElasticSearchStartUpCheck(ReactorElasticSearchClient client) {
        this.client = client;
    }

    @Override
    public CheckResult check() {
        try {

            Version esVersion = Version.fromString(client.info(RequestOptions.DEFAULT).getVersion().getNumber());

            if (esVersion.isCompatible(RECOMMENDED_ES_VERSION)) {
                return CheckResult.builder()
                    .checkName(checkName())
                    .resultType(ResultType.GOOD)
                    .build();
            }

            String esVersionCompatibilityWarn = String.format(
                "ES version(%s) is not compatible with the recommendation(%s)",
                esVersion.toString(),
                RECOMMENDED_ES_VERSION.toString());
            LOGGER.warn(esVersionCompatibilityWarn);

            return CheckResult.builder()
                .checkName(checkName())
                .resultType(ResultType.BAD)
                .description(esVersionCompatibilityWarn)
                .build();
        } catch (IOException e) {
            LOGGER.error(VERSION_CHECKING_ERROR_MESSAGE, e);
            return CheckResult.builder()
                .checkName(checkName())
                .resultType(ResultType.BAD)
                .description(VERSION_CHECKING_ERROR_MESSAGE + ": " + e.getMessage())
                .build();
        }
    }

    @Override
    public String checkName() {
        return CHECK_NAME;
    }
}