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| * http://www.apache.org/licenses/LICENSE-2.0 * |
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| * Unless required by applicable law or agreed to in writing, * |
| * software distributed under the License is distributed on an * |
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| ****************************************************************/ |
| |
| package org.apache.james.backends.rabbitmq; |
| |
| import java.util.Optional; |
| |
| import javax.inject.Inject; |
| |
| import org.apache.james.core.healthcheck.ComponentName; |
| import org.apache.james.core.healthcheck.HealthCheck; |
| import org.apache.james.core.healthcheck.Result; |
| |
| import reactor.core.publisher.Flux; |
| import reactor.core.publisher.Mono; |
| |
| public class RabbitMQHealthCheck implements HealthCheck { |
| private static final RabbitMQServerVersion MINIMAL_VERSION = RabbitMQServerVersion.of("3.8.1"); |
| private static final ComponentName COMPONENT_NAME = new ComponentName("RabbitMQ backend"); |
| |
| private final SimpleConnectionPool connectionPool; |
| private final ReactorRabbitMQChannelPool rabbitChannelPoolImpl; |
| |
| @Inject |
| public RabbitMQHealthCheck(SimpleConnectionPool connectionPool, ReactorRabbitMQChannelPool rabbitChannelPoolImpl) { |
| this.connectionPool = connectionPool; |
| this.rabbitChannelPoolImpl = rabbitChannelPoolImpl; |
| } |
| |
| @Override |
| public ComponentName componentName() { |
| return COMPONENT_NAME; |
| } |
| |
| @Override |
| public Mono<Result> check() { |
| try { |
| return Flux.concat(connectionPool.tryConnection(), |
| rabbitChannelPoolImpl.tryChannel()) |
| .reduce(true, (a, b) -> a && b) |
| .flatMap(channelOpen -> { |
| if (channelOpen) { |
| return checkVersion(); |
| } else { |
| return Mono.just(Result.unhealthy(COMPONENT_NAME, "The created connection was not opened")); |
| } |
| }) |
| .onErrorResume(e -> Mono.just(Result.unhealthy(COMPONENT_NAME, |
| "Unhealthy RabbitMQ instances: could not establish a connection", e))); |
| } catch (Exception e) { |
| return Mono.just(Result.unhealthy(COMPONENT_NAME, |
| "Unhealthy RabbitMQ instances: could not establish a connection", e)); |
| } |
| } |
| |
| private Mono<? extends Result> checkVersion() { |
| return connectionPool.version() |
| .map(Optional::of) |
| .defaultIfEmpty(Optional.empty()) |
| .flatMap(version -> { |
| boolean isCompatible = version |
| .map(fetchedVersion -> fetchedVersion.isAtLeast(MINIMAL_VERSION)) |
| .orElse(false); |
| |
| if (!isCompatible) { |
| String versionCompatibilityError = String.format( |
| "RabbitMQ version(%s) is not compatible with the required one(%s)", |
| version.map(RabbitMQServerVersion::asString).orElse("no versions fetched"), |
| MINIMAL_VERSION.asString()); |
| return Mono.just(Result.unhealthy(COMPONENT_NAME, versionCompatibilityError)); |
| } |
| |
| return Mono.just(Result.healthy(COMPONENT_NAME)); |
| }); |
| } |
| } |