|
| 1 | + |
| 2 | +#### 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 |
| 3 | + |
| 4 | +``` |
| 5 | +id service_id path enable_gray_release |
| 6 | +
|
| 7 | +CREATE TABLE `gray_release_config` ( |
| 8 | + `id` int(11) NOT NULL AUTO_INCREMENT, |
| 9 | + `service_id` varchar(255) DEFAULT NULL, |
| 10 | + `path` varchar(255) DEFAULT NULL, |
| 11 | + `enable_gray_release` int(11) DEFAULT NULL, |
| 12 | + PRIMARY KEY (`id`) |
| 13 | + ) ENGINE=InnoDB DEFAULT CHARSET=utf8 |
| 14 | + |
| 15 | +
|
| 16 | +
|
| 17 | +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 |
| 18 | +
|
| 19 | +<dependency> |
| 20 | + <groupId>io.jmnarloch</groupId> |
| 21 | + <artifactId>ribbon-discovery-filter-spring-cloud-starter</artifactId> |
| 22 | + <version>2.1.0</version> |
| 23 | + </dependency> |
| 24 | +
|
| 25 | +写一个zuul的filter，对每个请求，zuul都会调用这个filter |
| 26 | +
|
| 27 | +@Configuration |
| 28 | +public class GrayReleaseFilter extends ZuulFilter { |
| 29 | +
|
| 30 | +@Autowired |
| 31 | +private JdbcTemplate jdbcTemplate; |
| 32 | +
|
| 33 | + @Override |
| 34 | + public int filterOrder() { |
| 35 | + return PRE_DECORATION_FILTER_ORDER - 1; |
| 36 | + } |
| 37 | + |
| 38 | + @Override |
| 39 | + public String filterType() { |
| 40 | + return PRE_TYPE; |
| 41 | + } |
| 42 | + |
| 43 | + @Override |
| 44 | + public boolean shouldFilter() { |
| 45 | + |
| 46 | + } |
| 47 | + |
| 48 | + @Override |
| 49 | + public Object run() { |
| 50 | + RequestContext ctx = RequestContext.getCurrentContext(); |
| 51 | + HttpServletRequest request = ctx.getRequest(); |
| 52 | +
|
| 53 | +Random random = new Random(); |
| 54 | +int seed = random.getInt() * 100; |
| 55 | +
|
| 56 | + if (seed = 50) { |
| 57 | + // put the serviceId in `RequestContext` |
| 58 | + RibbonFilterContextHolder.getCurrentContext() |
| 59 | + .add("version", "new"); |
| 60 | + } else { |
| 61 | + RibbonFilterContextHolder.getCurrentContext() |
| 62 | + .add("version", "old"); |
| 63 | + } |
| 64 | + |
| 65 | + return null; |
| 66 | + } |
| 67 | +} |
| 68 | + ``` |
| 69 | + |
| 70 | +eureka: |
| 71 | +instance: |
| 72 | +metadata-map: |
| 73 | +version: new |
| 74 | + |
| 75 | + |
| 76 | + |
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