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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.http.server;
import com.yahoo.container.jdisc.HttpRequest;
import com.yahoo.document.DocumentTypeManager;
import com.yahoo.documentapi.metrics.DocumentApiMetrics;
import com.yahoo.jdisc.Metric;
import com.yahoo.jdisc.ReferencedResource;
import com.yahoo.jdisc.References;
import com.yahoo.messagebus.ErrorCode;
import com.yahoo.messagebus.Message;
import com.yahoo.messagebus.MessageBus;
import com.yahoo.messagebus.MessageBusParams;
import com.yahoo.messagebus.ReplyHandler;
import com.yahoo.messagebus.Result;
import com.yahoo.messagebus.SourceSessionParams;
import com.yahoo.messagebus.shared.SharedMessageBus;
import com.yahoo.messagebus.shared.SharedSourceSession;
import com.yahoo.metrics.simple.MetricReceiver;
import com.yahoo.vespa.http.client.core.Headers;
import com.yahoo.vespaxmlparser.MockFeedReaderFactory;
import com.yahoo.vespaxmlparser.VespaXMLFeedReader;
import org.junit.Before;
import org.junit.Test;
import java.io.IOException;
import java.io.InputStream;
import java.util.concurrent.atomic.AtomicInteger;
import static org.junit.Assert.assertTrue;
public class V3CongestionTestCase {
AtomicInteger threadsAvail = new AtomicInteger(10);
AtomicInteger requests = new AtomicInteger(0);
static class ClientFeederWithMocks extends ClientFeederV3 {
private final DocumentOperationMessageV3 docOp;
ClientFeederWithMocks(ReferencedResource<SharedSourceSession> sourceSession, FeedReaderFactory feedReaderFactory, DocumentTypeManager docTypeManager, String clientId, Metric metric, ReplyHandler feedReplyHandler, AtomicInteger threadsAvailableForFeeding) {
super(sourceSession, feedReaderFactory, docTypeManager, clientId, metric, feedReplyHandler, threadsAvailableForFeeding);
// The operation to return from the client feeder.
VespaXMLFeedReader.Operation op = new VespaXMLFeedReader.Operation();
docOp = DocumentOperationMessageV3.newRemoveMessage(op, "operation id");
}
@Override
protected DocumentOperationMessageV3 getNextMessage(
String operationId, InputStream requestInputStream, FeederSettings settings) throws Exception {
while (true) {
int data = requestInputStream.read();
if (data == -1 || data == (char)'\n') {
break;
}
}
return docOp;
}
}
final static int NUMBER_OF_QUEUE_FULL_RESPONSES = 5;
ClientFeederV3 clientFeederV3;
HttpRequest request;
@Before
public void setup() {
// Set up a request to be used from the tests.
InputStream in = new MetaStream(new byte[] { 1 });
request = HttpRequest
.createTestRequest(
"http://foo.bar:19020/reserved-for-internal-use/feedapi",
com.yahoo.jdisc.http.HttpRequest.Method.POST, in);
request.getJDiscRequest().headers().add(Headers.VERSION, "3");
request.getJDiscRequest().headers().add(Headers.CLIENT_ID, "clientId");
// Create a mock that does not parse the message, only reads the rest of the line. Makes it easier
// to write tests. It uses a mock for message bus.
clientFeederV3 = new ClientFeederWithMocks(
retainMockSession(new SourceSessionParams(), requests),
new MockFeedReaderFactory(),
null /*DocTypeManager*/,
"clientID",
null/*metric*/,
new FeedReplyReader(null/*metric*/, new DocumentApiMetrics(MetricReceiver.nullImplementation, "tester")),
threadsAvail);
}
// A mock for message bus that can simulate blocking requests.
private static class MockSharedSession extends SharedSourceSession {
boolean queuFull = true;
AtomicInteger requests;
public MockSharedSession(SourceSessionParams params, AtomicInteger requests) {
super(new SharedMessageBus(new MessageBus(new MockNetwork(),
new MessageBusParams())), params);
this.requests = requests;
}
@Override
public Result sendMessageBlocking(Message msg) throws InterruptedException {
return sendMessage(msg);
}
@Override
public Result sendMessage(Message msg) {
ReplyHandler handler = msg.popHandler();
if (queuFull) {
requests.incrementAndGet();
// Disable queue full after some attempts
if (requests.get() == NUMBER_OF_QUEUE_FULL_RESPONSES) {
queuFull = false;
}
Result r = new Result(ErrorCode.SEND_QUEUE_FULL, "queue full");
return r;
}
handler.handleReply(new MockReply(msg.getContext()));
return Result.ACCEPTED;
}
}
ReferencedResource<SharedSourceSession> retainMockSession(
SourceSessionParams sessionParams,
AtomicInteger requests) {
final SharedSourceSession session = new MockSharedSession(sessionParams, requests);
return new ReferencedResource<>(session, References.fromResource(session));
}
@Test
public void testRetriesWhenThreadsAvailable() throws IOException {
request.getJDiscRequest().headers().add(Headers.DENY_IF_BUSY, "true");
threadsAvail.set(10);
clientFeederV3.handleRequest(request);
assertTrue(requests.get() == NUMBER_OF_QUEUE_FULL_RESPONSES);
}
@Test
public void testNoRetriesWhenNoThreadsAvailable() throws IOException {
request.getJDiscRequest().headers().add(Headers.DENY_IF_BUSY, "true");
threadsAvail.set(0);
clientFeederV3.handleRequest(request);
assertTrue(requests.get() == 1);
}
@Test
public void testRetriesWhenNoThreadsAvailableButNoDenyIfBusy() throws IOException {
request.getJDiscRequest().headers().add(Headers.DENY_IF_BUSY, "false");
threadsAvail.set(0);
clientFeederV3.handleRequest(request);
assertTrue(requests.get() == NUMBER_OF_QUEUE_FULL_RESPONSES);
}
}
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