[GitHub] [skywalking] 504099993 commented on issue #6900: SpringcloudGateway can't get traceId

[GitBox <gi...@apache.org>]

504099993 commented on issue #6900:
URL: https://github.com/apache/skywalking/issues/6900#issuecomment-844175401


   > `
   > 包com.example.gatewaydemo.filter;
   > 
   > 导入org.apache.skywalking.apm.toolkit.trace.TraceContext;
   > 导入org.springframework.cloud.gateway.filter.GatewayFilterChain;
   > 导入org.springframework.cloud.gateway.filter.GlobalFilter;
   > 导入org.springframework.context.annotation.Bean;
   > 导入org.springframework.context.annotation.Configuration;
   > 导入org.springframework.core.Ordered;
   > 导入org.springframework.web.server.ServerWebExchange;
   > 导入reactor.core.publisher.Mono;
   > 
   > @configuration
   > 公共类FilterConfig {
   > 
   > ```
   > @Bean
   > public GlobalFilter b() {
   >     return new BFilter();
   > }
   > 
   > public class BFilter implements GlobalFilter, Ordered {
   > 
   >     @Override
   >     public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
   > 		// The value here is N/A
   >         exchange.getResponse().getHeaders().set("tid", TraceContext.traceId());
   >         return chain.filter(exchange).then(Mono.fromRunnable(() ->
   >         {
   > 			// The value here is also N/A
   >             String traceId2 = TraceContext.traceId();
   >             System.out.println("traceId:" + traceId2);
   >         }));
   >     }
   > 
   >     @Override
   >     public int getOrder() {
   >         return 1;
   >     }
   > }
   > ```
   > 
   > }
   > 
   > `
   
   Hello, I also encountered this problem. Using TraceContext.traceId() in the gateway, the traceId cannot be obtained. How did you solve it?


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