PutCorrelation in Spring Cloud Gateway Filter

[darknesstm]

Using TraceContext.putCorrelation in the Filter of Spring Cloud Gateway is currently ineffective, although I know that ServerWebExchange hava a snapshot of the current tracing context, there is no way to specify it.

Can a method similar to TraceContext.putCorrelation(Object enhancedInstance, String key, String value) be provided?

[wu-sheng]

I don't know what do you mean by this.
Trace Correlation relies on the trace continuous on the thread. Otherwise, you are on your own.

[darknesstm]

example source:

public class XXXGlobalFilter implements GlobalFilter{

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        // this is ineffective
        TraceContext.putCorrelation("aaa", "222");
       // maybe need TraceContext.putCorrelation(exchange, "aaa", "222");
        return chain.filter(exchange);
    }
}

[wu-sheng]

This is your own codes, you need to verify whether there is a valid tracing context.

[darknesstm]

But it seems that there is currently no way to obtain tracing context from a specified enhancement instance.

[wu-sheng]

That is common too. I think this is not guaranteed. Especially about the Spring Gateway case.