fish.payara.ejb.opentracing.OpenTracingIiopServerInterceptor Maven / Gradle / Ivy

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 * Copyright (c) 2020 Payara Foundation and/or its affiliates. All rights reserved.
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 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://github.com/payara/Payara/blob/master/LICENSE.txt
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 * GPL Classpath Exception:
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 * exception as provided by the Payara Foundation in the GPL Version 2 section of the License
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package fish.payara.ejb.opentracing;

import fish.payara.opentracing.OpenTracingService;
import io.opentracing.Scope;
import io.opentracing.SpanContext;
import io.opentracing.Tracer;
import io.opentracing.propagation.Format;
import io.opentracing.tag.Tags;
import org.omg.CORBA.LocalObject;
import org.omg.IOP.ServiceContext;
import org.omg.PortableInterceptor.ForwardRequest;
import org.omg.PortableInterceptor.ServerRequestInfo;
import org.omg.PortableInterceptor.ServerRequestInterceptor;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.ObjectInput;

import static fish.payara.ejb.opentracing.OpenTracingIiopInterceptorFactory.OPENTRACING_IIOP_ID;
import static fish.payara.opentracing.OpenTracingService.PAYARA_CORBA_RMI_TRACER_NAME;
import fish.payara.opentracing.ScopeManager;
import io.opentracing.Span;

/**
 * IIOP Server Interceptor for propagating OpenTracing SpanContext to Payara Server.
 *
 * @author Andrew Pielage 
 */
public class OpenTracingIiopServerInterceptor extends LocalObject implements ServerRequestInterceptor {

    private OpenTracingService openTracingService;
    private Tracer tracer;

    public OpenTracingIiopServerInterceptor(OpenTracingService openTracingService) {
        this.openTracingService = openTracingService;

        if (openTracingService != null && openTracingService.isEnabled()) {
            this.tracer = openTracingService.getTracer(PAYARA_CORBA_RMI_TRACER_NAME);
        }
    }

    @Override
    public void receive_request_service_contexts(ServerRequestInfo ri) throws ForwardRequest {
        // Noop
        return;
    }

    @Override
    public void receive_request(ServerRequestInfo serverRequestInfo) throws ForwardRequest {
        // Double check we have a tracer
        if (!tracerAvailable()) {
            return;
        }

        ServiceContext serviceContext = serverRequestInfo.get_request_service_context(OPENTRACING_IIOP_ID);
        if (serviceContext == null) {
            return;
        }

        OpenTracingIiopTextMap openTracingIiopTextMap = null;
        try (ByteArrayInputStream bis = new ByteArrayInputStream(serviceContext.context_data);
             ObjectInput in = new OpenTracingIiopObjectInputStream(bis)) {
            openTracingIiopTextMap = (OpenTracingIiopTextMap) in.readObject();
        } catch (IOException | ClassNotFoundException exception) {
            throw new ForwardRequest(exception.getMessage(), serverRequestInfo);
        }

        Tracer.SpanBuilder spanBuilder = tracer.buildSpan("rmi")
                .withTag(Tags.COMPONENT.getKey(), "ejb");

        if (openTracingIiopTextMap != null) {
            SpanContext spanContext = tracer.extract(Format.Builtin.TEXT_MAP, openTracingIiopTextMap);

            // Add the propagated span as a parent
            spanBuilder.asChildOf(spanContext);
        }

        // Start the span and mark it as active
        tracer.activateSpan(spanBuilder.start());
    }

    @Override
    public void send_reply(ServerRequestInfo serverRequestInfo) {
        closeScope();
    }

    @Override
    public void send_exception(ServerRequestInfo serverRequestInfo) throws ForwardRequest {
        closeScope();
    }

    @Override
    public void send_other(ServerRequestInfo serverRequestInfo) throws ForwardRequest {
        closeScope();
    }

    private void closeScope() {
        // Double check we have a tracer
        if (!tracerAvailable()) {
            return;
        }

        // Make sure active scope is closed - this is an entry point to the server so the currently active span
        // **should** be the one started in receive_request
        Span activeSpan = tracer.scopeManager().activeSpan();
        if (activeSpan != null) {
            activeSpan.finish();
        }
        if (tracer.scopeManager() instanceof ScopeManager) {
            ScopeManager manager = (ScopeManager) tracer.scopeManager();
            try (Scope activeScope = manager.activeScope()) {
            }
        }
    }

    private boolean tracerAvailable() {
        if (tracer == null) {
            if (openTracingService == null) {
                return false;
            }
            if (!openTracingService.isEnabled()) {
                return false;
            }
            this.tracer = openTracingService.getTracer(PAYARA_CORBA_RMI_TRACER_NAME);
            if (tracer == null) {
                return false;
            }
        }
        return true;
    }

    @Override
    public String name() {
        return this.getClass().getSimpleName();
    }

    @Override
    public void destroy() {

    }
}