Gateway過濾器中呼叫OpenFeign時出現迴圈依賴問題

钟音城發表於2024-03-15
Gateway過濾器

為了保證JWT隨機生成的金鑰一致，我設計了一個token服務，專門獲取JWT，和生成token。在閘道器使用client呼叫服務時，出現了bean迴圈依賴

The dependencies of some of the beans in the application context form a cycle:

┌─────┐
|  gateWayGlobalFilter defined in file [C:\Users\yinchrn\Desktop\Graduation project\mall-post\springcloud\gateway\target\classes\org\example\filter\GateWayGlobalFilter.class]
↑     ↓
|  org.example.client.TokenClient
↑     ↓
|  corsGatewayFilterApplicationListener defined in class path resource [org/springframework/cloud/gateway/config/GatewayAutoConfiguration.class]
↑     ↓
|  routePredicateHandlerMapping defined in class path resource [org/springframework/cloud/gateway/config/GatewayAutoConfiguration.class]
↑     ↓
|  filteringWebHandler defined in class path resource [org/springframework/cloud/gateway/config/GatewayAutoConfiguration.class]
└─────┘

透過在依賴注入時新增@Lazy解決

@Component
@Slf4j
public class GateWayGlobalFilter implements GlobalFilter, Ordered {
    private final AntPathMatcher antPathMatcher = new AntPathMatcher();
    @Autowired
    private AuthProperties authProperties;
    @Lazy
    @Autowired
    private TokenClient tokenClient;


    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        System.out.println("GateWayGlobalFilter---------");
        ServerHttpRequest request = exchange.getRequest();
        List<String> excludePath = authProperties.getExcludePath();
        for (String s : excludePath) {
            System.out.println(s);
        }
        /*
            獲取標頭檔案驗證例項，及攔截
         */
        if (isAllowPath(request)) {
            log.info("allowPath");
            return chain.filter(exchange);
        }
        /*
         * token驗證
         * */
        String token;
        Long uid;
        List<String> strings = request.getHeaders().get("token");
        if (strings != null) {
            token = strings.get(0);
            log.info("token:{}",token);
            try{
                uid = tokenClient.getUid(new TokenDTO("0",0L,token)).getData();
                //更改傳遞給微服務的 header
            }catch (Exception e){
                log.error("token驗證失敗");
                log.error(e.getMessage());
                ServerHttpResponse response = exchange.getResponse();
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }
        }else {
            log.error("token為空");
            ServerHttpResponse response = exchange.getResponse();
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        Long finalUid = uid;
        ServerWebExchange webExchange = exchange.mutate().request(
                        builder -> builder.header("uid", String.valueOf(finalUid)))
                        .build();
        return chain.filter(webExchange);
    }

    @Override
    public int getOrder() {
        return 0;
    }

    public Boolean isAllowPath(ServerHttpRequest request){
//        HttpMethod method = request.getMethod();
        String path = request.getPath().toString();
        System.out.println(path);
        List<String> excludePathList = authProperties.getExcludePath();
        for (String excludePath : excludePathList) {
            if (antPathMatcher.match(excludePath,path)){
                return true;
            }
        }
        return false;
    }
}

https://github.com/spring-cloud/spring-cloud-openfeign/issues/142
https://github.com/progress0407/e-commerce-with-msa/issues/1

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