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Integration between Aiven for Apache Kafka and Jikkou
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/*
 * SPDX-License-Identifier: Apache-2.0
 * Copyright (c) The original authors
 *
 * Licensed under the Apache Software License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
 */
package io.streamthoughts.jikkou.extension.aiven.change;

import io.streamthoughts.jikkou.core.data.TypeConverter;
import io.streamthoughts.jikkou.core.models.change.ResourceChange;
import io.streamthoughts.jikkou.core.models.change.SpecificStateChange;
import io.streamthoughts.jikkou.core.reconciler.ChangeError;
import io.streamthoughts.jikkou.core.reconciler.ChangeMetadata;
import io.streamthoughts.jikkou.core.reconciler.ChangeResponse;
import io.streamthoughts.jikkou.core.reconciler.Operation;
import io.streamthoughts.jikkou.core.reconciler.change.BaseChangeHandler;
import io.streamthoughts.jikkou.extension.aiven.api.AivenApiClient;
import io.streamthoughts.jikkou.extension.aiven.api.data.MessageErrorsResponse;
import io.streamthoughts.jikkou.http.client.RestClientException;
import java.util.Objects;
import java.util.Set;
import java.util.concurrent.CompletableFuture;
import java.util.function.Supplier;
import org.jetbrains.annotations.NotNull;

public abstract class AbstractChangeHandler extends BaseChangeHandler {

    protected final AivenApiClient api;

    /**
     * Creates a new {@link AbstractChangeHandler} instance.
     *
     * @param api the {@link AivenApiClient} instance.
     */
    public AbstractChangeHandler(@NotNull final AivenApiClient api,
                                 @NotNull final Operation operation) {
        this(api, Set.of(operation));
    }

    /**
     * Creates a new {@link AbstractChangeHandler} instance.
     *
     * @param api the {@link AivenApiClient} instance.
     */
    public AbstractChangeHandler(@NotNull final AivenApiClient api,
                                 @NotNull final Set supportedOperations) {
        super(supportedOperations);
        this.api = Objects.requireNonNull(api, "api must not be null");
    }

    protected  ChangeResponse executeAsync(final ResourceChange change,
                                                              final Supplier supplier) {
        CompletableFuture future = CompletableFuture
                .supplyAsync(() -> {
                    try {
                        supplier.get();
                        return ChangeMetadata.empty();
                    } catch (RestClientException e) {
                        try {
                            MessageErrorsResponse entity = e.getResponseEntity(MessageErrorsResponse.class);
                            if (entity.errors().size() == 1) {
                                MessageErrorsResponse.Error error = entity.errors().getFirst();
                                return new ChangeMetadata(new ChangeError(error.message(), error.status()));
                            } else {
                                return new ChangeMetadata(new ChangeError(entity.message()));
                            }
                        } catch (Exception ignore) {
                            return ChangeMetadata.of(e);
                        }
                    }
                });
        return new ChangeResponse<>(change, future);
    }

    public static  T getEntry(ResourceChange change, Class entryType) {
        SpecificStateChange entry = change.getSpec()
            .getChanges()
            .getLast("entry", TypeConverter.of(entryType));
        return change.getOp() == Operation.DELETE ? entry.getBefore() : entry.getAfter();
    }
}