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add uber-trace-id for request header #110

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add uber-trace-id for request header #110

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b4d9ac6
add uber-trace-id for request header,so microservice can get this for…
aslongyouloveme Jul 5, 2019
a7ee413
wrappleExchange method use foreach instead iterator
aslongyouloveme Jul 8, 2019
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20 changes: 19 additions & 1 deletion ...spring-web/src/main/java/io/opentracing/contrib/spring/web/webfilter/TracingOperator.java
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,7 @@
import io.opentracing.SpanContext;
import io.opentracing.Tracer;
import io.opentracing.propagation.Format;
import io.opentracing.propagation.TextMapAdapter;
import io.opentracing.tag.Tags;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.web.server.ServerWebExchange;
Expand All @@ -28,7 +29,10 @@
import reactor.core.publisher.MonoOperator;
import reactor.util.context.Context;

import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

/**
* Similar to {@code MonoWebFilterTrace} from spring-cloud-sleuth-core.
Expand Down Expand Up @@ -72,7 +76,21 @@ public void subscribe(final CoreSubscriber<? super Void> subscriber) {

try (final Scope scope = tracer.scopeManager().activate(span, false)) {
exchange.getAttributes().put(TracingWebFilter.SERVER_SPAN_CONTEXT, span.context());
source.subscribe(new TracingSubscriber(subscriber, exchange, context, span, spanDecorators));
source.subscribe(new TracingSubscriber(subscriber, this.wrappleExchange(span), context, span, spanDecorators));
}
}

private ServerWebExchange wrappleExchange(Span span) {
Map<String, String> map = new HashMap();
this.tracer.inject(span.context(), Format.Builtin.HTTP_HEADERS, new TextMapAdapter(map));
ServerHttpRequest req = this.exchange.getRequest();
Iterator iterator = map.keySet().iterator();

while (iterator.hasNext()) {
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String key = (String) iterator.next();
req.mutate().header(key, map.get(key));
}

return this.exchange.mutate().request(req).build();
}
}