src/main/java/org/apache/sling/testing/clients/util/ServerErrorRetryStrategy.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with this
 * work for additional information regarding copyright ownership. The ASF
 * licenses this file to You under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package org.apache.sling.testing.clients.util;

import org.apache.http.HttpResponse;
import org.apache.http.client.ServiceUnavailableRetryStrategy;
import org.apache.http.protocol.HttpContext;
import org.apache.http.util.EntityUtils;
import org.apache.sling.testing.clients.SystemPropertiesConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.util.Arrays;
import java.util.Collection;

import static org.apache.http.HttpStatus.*;

/**
 * {code ServiceUnavailableRetryStrategy} strategy for retrying request in case of a 5XX response code
 */
public class ServerErrorRetryStrategy implements ServiceUnavailableRetryStrategy {

    private static final Logger LOG = LoggerFactory.getLogger(ServerErrorRetryStrategy.class);

    public ServerErrorRetryStrategy() {
        super();
    }

    @Override
    public boolean retryRequest(final HttpResponse response, final int executionCount, final HttpContext context) {
        boolean needsRetry = executionCount <= SystemPropertiesConfig.getHttpRetries() && responseRetryCondition(response);

        if (SystemPropertiesConfig.isHttpLogRetries() && needsRetry && LOG.isWarnEnabled()) {
            LOG.warn("Request retry needed due to service unavailable response");
            LOG.warn("Response headers contained:");
            Arrays.stream(response.getAllHeaders()).forEach(h -> LOG.warn("Header {}:{}", h.getName(), h.getValue()));
            try {
                String content = EntityUtils.toString(response.getEntity());
                LOG.warn("Response content: {}", content);
            } catch (IOException exc) {
                LOG.warn("Response as no content");
            }
        }
        return needsRetry;
    }

    @Override
    public long getRetryInterval() {
        return SystemPropertiesConfig.getHttpRetriesDelay();
    }

    private boolean responseRetryCondition(final HttpResponse response) {
        final Integer statusCode = response.getStatusLine().getStatusCode();
        final Collection<Integer> errorCodes = SystemPropertiesConfig.getHttpRetriesErrorCodes();
        if (errorCodes != null && !errorCodes.isEmpty()) {
            return errorCodes.contains(statusCode);
        } else {
            return statusCode >= SC_INTERNAL_SERVER_ERROR &&
                    statusCode < SC_INTERNAL_SERVER_ERROR + 100;
        }
    }
}