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https://gitee.com/shishan100/Java-Interview-Advanced
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77 lines
1.7 KiB
Markdown
Executable File
77 lines
1.7 KiB
Markdown
Executable File
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#### 准备一个数据库和一个表（也可以用Apollo配置中心、Redis、ZooKeeper，其实都可以），放一个灰度发布启用表
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```
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id service_id path enable_gray_release
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CREATE TABLE `gray_release_config` (
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`id` int(11) NOT NULL AUTO_INCREMENT,
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`service_id` varchar(255) DEFAULT NULL,
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`path` varchar(255) DEFAULT NULL,
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`enable_gray_release` int(11) DEFAULT NULL,
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PRIMARY KEY (`id`)
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) ENGINE=InnoDB DEFAULT CHARSET=utf8
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在zuul里面加入下面的filter，可以在zuul的filter里定制ribbon的负载均衡策略
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<dependency>
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<groupId>io.jmnarloch</groupId>
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<artifactId>ribbon-discovery-filter-spring-cloud-starter</artifactId>
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<version>2.1.0</version>
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</dependency>
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写一个zuul的filter，对每个请求，zuul都会调用这个filter
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@Configuration
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public class GrayReleaseFilter extends ZuulFilter {
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@Autowired
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private JdbcTemplate jdbcTemplate;
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@Override
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public int filterOrder() {
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return PRE_DECORATION_FILTER_ORDER - 1;
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}
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@Override
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public String filterType() {
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return PRE_TYPE;
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}
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@Override
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public boolean shouldFilter() {
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}
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@Override
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public Object run() {
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RequestContext ctx = RequestContext.getCurrentContext();
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HttpServletRequest request = ctx.getRequest();
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Random random = new Random();
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int seed = random.getInt() * 100;
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if (seed = 50) {
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// put the serviceId in `RequestContext`
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RibbonFilterContextHolder.getCurrentContext()
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.add("version", "new");
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} else {
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RibbonFilterContextHolder.getCurrentContext()
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.add("version", "old");
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}
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return null;
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}
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}
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```
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eureka:
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instance:
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metadata-map:
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version: new
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