/*
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* Copyright (c) 2018-2028, DreamLu All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* Neither the name of the dreamlu.net developer nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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* Author: DreamLu 卢春梦 (596392912@qq.com)
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*/
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package org.springblade.core.http;
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import lombok.RequiredArgsConstructor;
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import okhttp3.Interceptor;
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import okhttp3.Request;
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import okhttp3.Response;
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import okhttp3.ResponseBody;
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import org.springframework.retry.backoff.FixedBackOffPolicy;
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import org.springframework.retry.policy.SimpleRetryPolicy;
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import org.springframework.retry.support.RetryTemplate;
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import java.io.IOException;
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import java.util.function.Predicate;
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/**
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* 重试拦截器,应对代理问题
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*
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* @author L.cm
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*/
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@RequiredArgsConstructor
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public class RetryInterceptor implements Interceptor {
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private final RetryPolicy retryPolicy;
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@Override
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public Response intercept(Chain chain) throws IOException {
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Request request = chain.request();
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RetryTemplate template = createRetryTemplate(retryPolicy);
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return template.execute(context -> {
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Response response = chain.proceed(request);
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// 结果集校验
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Predicate<ResponseSpec> respPredicate = retryPolicy.getRespPredicate();
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if (respPredicate == null) {
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return response;
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}
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// copy 一份 body
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ResponseBody body = response.peekBody(Long.MAX_VALUE);
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try (HttpResponse httpResponse = new HttpResponse(response)) {
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if (respPredicate.test(httpResponse)) {
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throw new IOException("Http Retry ResponsePredicate test Failure.");
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}
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}
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return response.newBuilder().body(body).build();
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});
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}
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private static RetryTemplate createRetryTemplate(RetryPolicy policy) {
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RetryTemplate template = new RetryTemplate();
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// 重试策略
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SimpleRetryPolicy retryPolicy = new SimpleRetryPolicy();
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retryPolicy.setMaxAttempts(policy.getMaxAttempts());
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// 设置间隔策略
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FixedBackOffPolicy backOffPolicy = new FixedBackOffPolicy();
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backOffPolicy.setBackOffPeriod(policy.getSleepMillis());
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template.setRetryPolicy(retryPolicy);
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template.setBackOffPolicy(backOffPolicy);
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return template;
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}
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}
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