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Instrumentation of Java libraries using OpenTelemetry.

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/*
 * Copyright The OpenTelemetry Authors
 * SPDX-License-Identifier: Apache-2.0
 */

package io.opentelemetry.javaagent.instrumentation.vertx;

import static io.opentelemetry.context.ContextKey.named;

import io.opentelemetry.api.trace.Span;
import io.opentelemetry.context.Context;
import io.opentelemetry.context.ContextKey;
import io.opentelemetry.context.Scope;
import io.opentelemetry.instrumentation.api.instrumenter.LocalRootSpan;
import io.opentelemetry.instrumentation.api.semconv.http.HttpServerRoute;
import io.opentelemetry.instrumentation.api.semconv.http.HttpServerRouteSource;
import io.vertx.core.Handler;
import io.vertx.ext.web.RoutingContext;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.UndeclaredThrowableException;
import java.util.concurrent.CompletionException;
import java.util.concurrent.ExecutionException;

/** This is used to wrap Vert.x Handlers to provide nice user-friendly SERVER span names */
public final class RoutingContextHandlerWrapper implements Handler {

  private static final ContextKey ROUTE_KEY = named("opentelemetry-vertx-route");

  private final Handler handler;

  public RoutingContextHandlerWrapper(Handler handler) {
    this.handler = handler;
  }

  @Override
  public void handle(RoutingContext context) {
    Context otelContext = Context.current();
    String route = getRoute(otelContext, context);
    if (route != null && route.endsWith("/")) {
      route = route.substring(0, route.length() - 1);
    }
    HttpServerRoute.update(otelContext, HttpServerRouteSource.NESTED_CONTROLLER, route);

    try (Scope ignore = otelContext.with(ROUTE_KEY, route).makeCurrent()) {
      handler.handle(context);
    } catch (Throwable throwable) {
      Span serverSpan = LocalRootSpan.fromContextOrNull(otelContext);
      if (serverSpan != null) {
        serverSpan.recordException(unwrapThrowable(throwable));
      }
      throw throwable;
    }
  }

  private static String getRoute(Context otelContext, RoutingContext routingContext) {
    String route = routingContext.currentRoute().getPath();
    String existingRoute = otelContext.get(ROUTE_KEY);
    return existingRoute != null ? existingRoute + route : route;
  }

  private static Throwable unwrapThrowable(Throwable throwable) {
    if (throwable.getCause() != null
        && (throwable instanceof ExecutionException
            || throwable instanceof CompletionException
            || throwable instanceof InvocationTargetException
            || throwable instanceof UndeclaredThrowableException)) {
      return unwrapThrowable(throwable.getCause());
    }
    return throwable;
  }
}