运行sole下面的soul-examples-http服务

上篇文章（juejin.cn/post/691764…, 已经验证了启动sole-examples下面的soul-examples-http服务，通过sole-bootstrap网关来访问，这节课我们就详细介绍下soul的http代理。

1、启动sole-admin、sole-bootstrap、sole-examples下的sole-examples-http，可以看到sole-admin后台左侧菜单栏的SelectorList有了对应的Selector记录，RuleList 出现对应的Rule记录， 验证网关服务正常。

2、再启动一个sole-examples-http服务，发现SelectorList里面对应的Selector里面的Configuration新增了刚起的sole-examples-http服务，可以配置对应的权重值，调用网关服务进行验证，发现权重生效。对应的Configuration还可以配置服务开启关闭，当关闭后，通过网关继续请求服务时，会发现网关不会请求已经关闭的服务。

3、网关的转发在DividePlugin里面

@Override
protected Mono<Void> doExecute(final ServerWebExchange exchange, final SoulPluginChain chain, final SelectorData selector, final RuleData rule) {
    final SoulContext soulContext = exchange.getAttribute(Constants.CONTEXT);
    assert soulContext != null;
    final DivideRuleHandle ruleHandle = GsonUtils.getInstance().fromJson(rule.getHandle(), DivideRuleHandle.class);
    final List<DivideUpstream> upstreamList = UpstreamCacheManager.getInstance().findUpstreamListBySelectorId(selector.getId());
    if (CollectionUtils.isEmpty(upstreamList)) {
        log.error("divide upstream configuration error： {}", rule.toString());
        Object error = SoulResultWrap.error(SoulResultEnum.CANNOT_FIND_URL.getCode(), SoulResultEnum.CANNOT_FIND_URL.getMsg(), null);
        return WebFluxResultUtils.result(exchange, error);
    }
    final String ip = Objects.requireNonNull(exchange.getRequest().getRemoteAddress()).getAddress().getHostAddress();
    DivideUpstream divideUpstream = LoadBalanceUtils.selector(upstreamList, ruleHandle.getLoadBalance(), ip);
    if (Objects.isNull(divideUpstream)) {
        log.error("divide has no upstream");
        Object error = SoulResultWrap.error(SoulResultEnum.CANNOT_FIND_URL.getCode(), SoulResultEnum.CANNOT_FIND_URL.getMsg(), null);
        return WebFluxResultUtils.result(exchange, error);
    }
    // set the http url
    String domain = buildDomain(divideUpstream);
    String realURL = buildRealURL(domain, soulContext, exchange);
    exchange.getAttributes().put(Constants.HTTP_URL, realURL);
    // set the http timeout
    exchange.getAttributes().put(Constants.HTTP_TIME_OUT, ruleHandle.getTimeout());
    exchange.getAttributes().put(Constants.HTTP_RETRY, ruleHandle.getRetry());
    return chain.execute(exchange);
}

4、代码讲解 sole-examples 里面的 sole-examples-http 启动时会通过 SpringMvcClientBeanPostProcessor 把含有@SoulSpringMvcClient注解的类和方法通过调用sole-admin的服务/soul-client/springmvc-register注册到PluginList的divide. SpringMvcClientBeanPostProcessor 部分代码如下：

Sole-bootstrap网关做转发是通过sole-plugin下的sole-plugin-divide 的DividePlugin 类实现。 DividePlugin 核心代码：

@Override
protected Mono<Void> doExecute(final ServerWebExchange exchange, final SoulPluginChain chain, final SelectorData selector, final RuleData rule) {
    final SoulContext soulContext = exchange.getAttribute(Constants.CONTEXT);
    assert soulContext != null;
    final DivideRuleHandle ruleHandle = GsonUtils.getInstance().fromJson(rule.getHandle(), DivideRuleHandle.class);
    final List<DivideUpstream> upstreamList = UpstreamCacheManager.getInstance().findUpstreamListBySelectorId(selector.getId());
    if (CollectionUtils.isEmpty(upstreamList)) {
        log.error("divide upstream configuration error： {}", rule.toString());
        Object error = SoulResultWrap.error(SoulResultEnum.CANNOT_FIND_URL.getCode(), SoulResultEnum.CANNOT_FIND_URL.getMsg(), null);
        return WebFluxResultUtils.result(exchange, error);
    }
    final String ip = Objects.requireNonNull(exchange.getRequest().getRemoteAddress()).getAddress().getHostAddress();
    DivideUpstream divideUpstream = LoadBalanceUtils.selector(upstreamList, ruleHandle.getLoadBalance(), ip);
    if (Objects.isNull(divideUpstream)) {
        log.error("divide has no upstream");
        Object error = SoulResultWrap.error(SoulResultEnum.CANNOT_FIND_URL.getCode(), SoulResultEnum.CANNOT_FIND_URL.getMsg(), null);
        return WebFluxResultUtils.result(exchange, error);
    }
    // set the http url
    String domain = buildDomain(divideUpstream);
    String realURL = buildRealURL(domain, soulContext, exchange);
    exchange.getAttributes().put(Constants.HTTP_URL, realURL);
    // set the http timeout
    exchange.getAttributes().put(Constants.HTTP_TIME_OUT, ruleHandle.getTimeout());
    exchange.getAttributes().put(Constants.HTTP_RETRY, ruleHandle.getRetry());
    return chain.execute(exchange);
}

另外，可以打断点通过Debugger看上下文的调用情况。设计很好，但是调用层次比较深。所以如果要弄熟悉需要多操作，多调试。