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Version: 2.5.0

插件扩展

说明#

  • 插件是 Apache ShenYu 网关的核心执行者,每个插件在开启的情况下,都会对匹配的流量,进行自己的处理。
  • Apache ShenYu 网关里面,插件分为两类。
    • 一类是单一职责的调用链,不能对流量进行自定义的筛选。
    • 一类是能对匹配的流量,执行自己的职责调用链。
  • 用户可以参考 shenyu-plugin 模块,新增自己的插件处理,如果有好的公用插件,可以向官网提交pr

单一职责插件#

  • 引入如下依赖:
<dependency>    <groupId>org.apache.shenyu</groupId>    <artifactId>shenyu-plugin-api</artifactId>    <version>${project.version}</version></dependency>
  • 用户新增一个类 MyShenyuPlugin,直接实现 org.apache.shenyu.plugin.api.ShenyuPlugin
public interface ShenyuPlugin {
    /**     * Process the Web request and (optionally) delegate to the next     * {@code WebFilter} through the given {@link ShenyuPluginChain}.     *     * @param exchange the current server exchange     * @param chain    provides a way to delegate to the next filter     * @return {@code Mono<Void>} to indicate when request processing is complete     */    Mono<Void> execute(ServerWebExchange exchange, ShenyuPluginChain chain);
    /**     * return plugin order .     * This attribute To determine the plugin execution order in the same type plugin.     *     * @return int order     */    int getOrder();
    /**     * acquire plugin name.     * this is plugin name define you must Provide the right name.     * if you impl AbstractShenyuPlugin this attribute not use.     *     * @return plugin name.     */    default String named() {        return "";    }
    /**     * plugin is execute.     * if return true this plugin can not execute.     *     * @param exchange the current server exchange     * @return default false.     */    default Boolean skip(ServerWebExchange exchange) {        return false;    }}
  • 接口方法详细说明

    • execute() 方法为核心的执行方法,用户可以在里面自由的实现自己想要的功能。

    • getOrder() 指定插件的排序。

    • named() 指定插件的名称,命名采用Camel Case,如:dubbospringCloud

    • skip() 在特定的条件下,该插件是否被跳过。

  • 注册成Springbean,参考如下,或者直接在实现类上加 @Component 注解。
    @Bean    public ShenyuPlugin myShenyuPlugin() {        return new MyShenyuPlugin();    }

匹配流量处理插件#

  • 引入如下依赖:
        <dependency>            <groupId>org.apache.shenyu</groupId>            <artifactId>shenyu-plugin-base</artifactId>            <version>${project.version}</version>        </dependency>
  • 新增一个类 CustomPlugin,继承 org.apache.shenyu.plugin.base.AbstractShenyuPlugin

  • 以下是参考:

/** * This is your custom plugin. * He is running in after before plugin, implement your own functionality. * extends AbstractShenyuPlugin so you must user shenyu-admin And add related plug-in development. * * @author xiaoyu(Myth) */public class CustomPlugin extends AbstractShenyuPlugin {
    /**     * return plugin order .     * The same plugin he executes in the same order.     *     * @return int     */    @Override    public int getOrder() {        return 0;    }
    /**     * acquire plugin name.     * return you custom plugin name.     * It must be the same name as the plug-in you added in the admin background.     *     * @return plugin name.     */    @Override    public String named() {        return "shenYu";    }
    /**     * plugin is execute.     * Do I need to skip.     * if you need skip return true.     *     * @param exchange the current server exchange     * @return default false.     */    @Override    public Boolean skip(final ServerWebExchange exchange) {        return false;    }
    /**     * this is Template Method child has Implement your own logic.     *     * @param exchange exchange the current server exchange     * @param chain    chain the current chain     * @param selector selector     * @param rule     rule     * @return {@code Mono<Void>} to indicate when request handling is complete     */    @Override    protected abstract Mono<Void> doExecute(ServerWebExchange exchange, ShenyuPluginChain chain, SelectorData selector, RuleData rule) {        LOGGER.debug(".......... function plugin start..............");        /*         * Processing after your selector matches the rule.         * rule.getHandle() is you Customize the json string to be processed.         * for this example.         * Convert your custom json string pass to an entity class.         */        final String ruleHandle = rule.getHandle();
        final Test test = GsonUtils.getInstance().fromJson(ruleHandle, Test.class);
        /*         * Then do your own business processing.         * The last execution  chain.execute(exchange).         * Let it continue on the chain until the end.         */        System.out.println(test.toString());        return chain.execute(exchange);    }}
  • 详细讲解:

    • 继承该类的插件,插件会进行选择器规则匹配。

    • 首先在 shenyu-admin 后台管理系统 --> 基础配置 --> 插件管理 中,新增一个插件,注意 名称与 你自定义插件的 named() 方法要一致。

    • 重新登陆 shenyu-admin 后台,可以看见刚新增的插件,然后就可以进行选择器规则匹配。

    • 在规则中,有个 handler 字段,是自定义处理数据,在 doExecute() 方法中,通过 final String ruleHandle = rule.getHandle(); 获取,然后进行你的操作。

  • 注册成Springbean,参考如下或者直接在实现类上加 @Component 注解。

    @Bean    public ShenyuPlugin customPlugin() {        return new CustomPlugin();    }

订阅你的插件数据,进行自定义的处理#

  • 新增一个类 PluginDataHandler,实现 org.apache.shenyu.plugin.base.handler.PluginDataHandler
public interface PluginDataHandler {
    /**     * Handler plugin.     *     * @param pluginData the plugin data     */    default void handlerPlugin(PluginData pluginData) {    }
    /**     * Remove plugin.     *     * @param pluginData the plugin data     */    default void removePlugin(PluginData pluginData) {    }
    /**     * Handler selector.     *     * @param selectorData the selector data     */    default void handlerSelector(SelectorData selectorData) {    }
    /**     * Remove selector.     *     * @param selectorData the selector data     */    default void removeSelector(SelectorData selectorData) {    }
    /**     * Handler rule.     *     * @param ruleData the rule data     */    default void handlerRule(RuleData ruleData) {    }
    /**     * Remove rule.     *     * @param ruleData the rule data     */    default void removeRule(RuleData ruleData) {    }
    /**     * Plugin named string.     *     * @return the string     */    String pluginNamed();
}
  • 注意 pluginNamed() 要和你自定义的插件名称相同。

  • 注册成Springbean,参考如下或者直接在实现类上加 @Component 注解。

@Beanpublic PluginDataHandler pluginDataHandler() {    return new PluginDataHandler();}

动态加载自定义插件#

  • 当使用此功能时候,上述扩展 ShenyuPlugin, PluginDataHandler, 不用成为 spring bean。只需要构建出扩展项目的jar包即可。

  • 使用以下配置:

shenyu:  extPlugin:    path:  //加载扩展插件jar包路径    enabled: true //是否开启    threads: 1  //加载插件线程数量    scheduleTime: 300 //间隔时间(单位:秒)    scheduleDelay: 30 //网关启动后延迟多久加载(单位:秒)

插件加载路径详解#

  • 此路径是为存放扩展插件jar包的目录。

  • 可以使用 -Dplugin-ext=xxxx 指定,也可以使用 shenyu.extPlugin.path配置文件指定,如果都没配置,默认会加载网关启动路径下的 ext-lib目录。

  • 优先级 :-Dplugin-ext=xxxx > shenyu.extPlugin.path > ext-lib(default)