動態路由背景
無論你在使用Zuul還是Spring Cloud Gateway 的時候，官方文件提供的方案總是基於配置檔案配置的方式
例如：
# zuul 的配置形式
routes:
pig-auth:
path: /auth/**
serviceId: pig-auth
stripPrefix: true
# gateway 的配置形式
routes:
- id: pigx-auth
uri: lb://pigx-auth
predicates:
- Path=/auth/**
filters:
- ValidateCodeGatewayFilter
複製程式碼配置更改需要重啟服務，不能滿足實際生產過程中的動態重新整理、實時變更的業務需求。
基於以上分析 pig已經提供了基於Zuul版本的動態路由功能，附Git 地址傳送門,效果如下圖可以實時配置修改重新整理。
Spring Cloud Gateway 路由載入原始碼
- DispatcherHandler 接管使用者請求
- RoutePredicateHandlerMapping 路由匹配
- 根據RouteLocator獲取 RouteDefinitionLocator
- 返回多個RouteDefinitionLocator.getRouteDefinitions()的路由定義資訊
- FilteringWebHandler執行路由定義中的filter 最後路由到具體的業務服務中
Spring Cloud Gateway 預設動態路由實現
GatewayControllerEndpoint 基於actuate端點的預設實現，支援JVM 級別的動態路由，不能序列化儲存
// 上圖動態路由的資訊儲存的預設實現是基於記憶體的實現
public class InMemoryRouteDefinitionRepository implements RouteDefinitionRepository {
private final Map<String, RouteDefinition> routes = synchronizedMap(new LinkedHashMap<String, RouteDefinition>());
@Override
public Mono<Void> save(Mono<RouteDefinition> route){}
@Override
public Mono<Void> delete(Mono<String> routeId){}
@Override
public Flux<RouteDefinition> getRouteDefinitions(){}
}
複製程式碼擴充套件基於Mysql + Redis儲存分散式動態元件
為什麼使用Mysql的同時，又要使用Redis？
- spring cloud gateway 基於webflux 背壓，暫時不支援mysql 資料庫
- Redis-reactive 支援 spring cloudgateway 的背壓，同時還可以實現分散式，高效能
擴充套件思路
- 增加一個路由管理模組，參考GatewayControllerEndpoint實現，啟動時載入資料庫中配置檔案到Redis
- 閘道器模組重寫RouteDefinitionRepository，getRouteDefinitions（）取Redis中讀取即可實現
- 前端配合 json-view 類似外掛，直接修改展示。
具體實現
- 路由管理模組核心處理邏輯，獲取路由和更新路由
/**
* @author lengleng
* @date 2018年11月06日10:27:55
* <p>
* 動態路由處理類
*/
@Slf4j
@AllArgsConstructor
@Service("sysRouteConfService")
public class SysRouteConfServiceImpl extends ServiceImpl<SysRouteConfMapper, SysRouteConf> implements SysRouteConfService {
private final RedisTemplate redisTemplate;
private final ApplicationEventPublisher applicationEventPublisher;
/**
* 獲取全部路由
* <p>
* RedisRouteDefinitionWriter.java
* PropertiesRouteDefinitionLocator.java
*
* @return
*/
@Override
public List<SysRouteConf> routes() {
SysRouteConf condition = new SysRouteConf();
condition.setDelFlag(CommonConstant.STATUS_NORMAL);
return baseMapper.selectList(new EntityWrapper<>(condition));
}
/**
* 更新路由資訊
*
* @param routes 路由資訊
* @return
*/
@Override
public Mono<Void> editRoutes(JSONArray routes) {
// 清空Redis 快取
Boolean result = redisTemplate.delete(CommonConstant.ROUTE_KEY);
log.info("清空閘道器路由 {} ", result);
// 遍歷修改的routes，儲存到Redis
List<RouteDefinitionVo> routeDefinitionVoList = new ArrayList<>();
routes.forEach(value -> {
log.info("更新路由 ->{}", value);
RouteDefinitionVo vo = new RouteDefinitionVo();
Map<String, Object> map = (Map) value;
Object id = map.get("routeId");
if (id != null) {
vo.setId(String.valueOf(id));
}
Object predicates = map.get("predicates");
if (predicates != null) {
JSONArray predicatesArray = (JSONArray) predicates;
List<PredicateDefinition> predicateDefinitionList =
predicatesArray.toList(PredicateDefinition.class);
vo.setPredicates(predicateDefinitionList);
}
Object filters = map.get("filters");
if (filters != null) {
JSONArray filtersArray = (JSONArray) filters;
List<FilterDefinition> filterDefinitionList
= filtersArray.toList(FilterDefinition.class);
vo.setFilters(filterDefinitionList);
}
Object uri = map.get("uri");
if (uri != null) {
vo.setUri(URI.create(String.valueOf(uri)));
}
Object order = map.get("order");
if (order != null) {
vo.setOrder(Integer.parseInt(String.valueOf(order)));
}
redisTemplate.setHashValueSerializer(new Jackson2JsonRedisSerializer<>(RouteDefinitionVo.class));
redisTemplate.opsForHash().put(CommonConstant.ROUTE_KEY, vo.getId(), vo);
routeDefinitionVoList.add(vo);
});
// 邏輯刪除全部
SysRouteConf condition = new SysRouteConf();
condition.setDelFlag(CommonConstant.STATUS_NORMAL);
this.delete(new EntityWrapper<>(condition));
//插入生效路由
List<SysRouteConf> routeConfList = routeDefinitionVoList.stream().map(vo -> {
SysRouteConf routeConf = new SysRouteConf();
routeConf.setRouteId(vo.getId());
routeConf.setFilters(JSONUtil.toJsonStr(vo.getFilters()));
routeConf.setPredicates(JSONUtil.toJsonStr(vo.getPredicates()));
routeConf.setOrder(vo.getOrder());
routeConf.setUri(vo.getUri().toString());
return routeConf;
}).collect(Collectors.toList());
this.insertBatch(routeConfList);
log.debug("更新閘道器路由結束 ");
this.applicationEventPublisher.publishEvent(new RefreshRoutesEvent(this));
return Mono.empty();
}
}
複製程式碼- 閘道器自定義RedisRouteDefinitionRepository
@Slf4j
@Component
@AllArgsConstructor
public class RedisRouteDefinitionWriter implements RouteDefinitionRepository {
private final RedisTemplate redisTemplate;
@Override
public Mono<Void> save(Mono<RouteDefinition> route) {
return route.flatMap(r -> {
RouteDefinitionVo vo = new RouteDefinitionVo();
BeanUtils.copyProperties(r, vo);
log.info("儲存路由資訊{}", vo);
redisTemplate.opsForHash().put(CommonConstant.ROUTE_KEY, r.getId(), vo);
return Mono.empty();
});
}
@Override
public Mono<Void> delete(Mono<String> routeId) {
routeId.subscribe(id -> {
log.info("刪除路由資訊{}", id);
redisTemplate.opsForHash().delete(CommonConstant.ROUTE_KEY, id);
});
return Mono.empty();
}
@Override
public Flux<RouteDefinition> getRouteDefinitions() {
redisTemplate.setHashValueSerializer(new Jackson2JsonRedisSerializer<>(RouteDefinitionVo.class));
List<RouteDefinitionVo> values = redisTemplate.opsForHash().values(CommonConstant.ROUTE_KEY);
List<RouteDefinition> definitionList = new ArrayList<>();
values.forEach(vo -> {
RouteDefinition routeDefinition = new RouteDefinition();
BeanUtils.copyProperties(vo, routeDefinition);
definitionList.add(vo);
});
log.debug("redis 中路由定義條數： {}， {}", definitionList.size(), definitionList);
return Flux.fromIterable(definitionList);
}
}
複製程式碼3.庫表定義
