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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package ai.vespa.feed.client.impl;
import ai.vespa.feed.client.FeedClientBuilder.Compression;
import ai.vespa.feed.client.HttpResponse;
import org.apache.hc.client5.http.async.methods.SimpleHttpRequest;
import org.apache.hc.client5.http.async.methods.SimpleHttpResponse;
import org.apache.hc.client5.http.config.RequestConfig;
import org.apache.hc.client5.http.impl.async.CloseableHttpAsyncClient;
import org.apache.hc.client5.http.impl.async.HttpAsyncClients;
import org.apache.hc.client5.http.ssl.ClientTlsStrategyBuilder;
import org.apache.hc.core5.concurrent.FutureCallback;
import org.apache.hc.core5.http.ContentType;
import org.apache.hc.core5.http.Header;
import org.apache.hc.core5.http.HttpHeaders;
import org.apache.hc.core5.http.HttpHost;
import org.apache.hc.core5.http.message.BasicHeader;
import org.apache.hc.core5.http2.config.H2Config;
import org.apache.hc.core5.net.URIAuthority;
import org.apache.hc.core5.reactor.IOReactorConfig;
import org.apache.hc.core5.util.Timeout;
import javax.net.ssl.SSLContext;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.net.URI;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.zip.GZIPOutputStream;
import static ai.vespa.feed.client.FeedClientBuilder.Compression.auto;
import static ai.vespa.feed.client.FeedClientBuilder.Compression.gzip;
import static org.apache.hc.core5.http.ssl.TlsCiphers.excludeH2Blacklisted;
import static org.apache.hc.core5.http.ssl.TlsCiphers.excludeWeak;
/**
* @author jonmv
*/
class ApacheCluster implements Cluster {
private final List<Endpoint> endpoints = new ArrayList<>();
private final List<BasicHeader> defaultHeaders = Arrays.asList(new BasicHeader(HttpHeaders.USER_AGENT, String.format("vespa-feed-client/%s", Vespa.VERSION)),
new BasicHeader("Vespa-Client-Version", Vespa.VERSION));
private final Header gzipEncodingHeader = new BasicHeader(HttpHeaders.CONTENT_ENCODING, "gzip");
private final RequestConfig requestConfig;
private final Compression compression;
private int someNumber = 0;
private final ExecutorService dispatchExecutor = Executors.newFixedThreadPool(8, t -> new Thread(t, "request-dispatch-thread"));
private final ScheduledExecutorService timeoutExecutor = Executors.newSingleThreadScheduledExecutor(t -> new Thread(t, "request-timeout-thread"));
ApacheCluster(FeedClientBuilderImpl builder) throws IOException {
for (int i = 0; i < builder.connectionsPerEndpoint; i++)
for (URI endpoint : builder.endpoints)
endpoints.add(new Endpoint(createHttpClient(builder), endpoint));
this.requestConfig = createRequestConfig(builder);
this.compression = builder.compression;
}
@Override
public void dispatch(HttpRequest wrapped, CompletableFuture<HttpResponse> vessel) {
Endpoint leastBusy = endpoints.get(0);
int min = Integer.MAX_VALUE;
int start = ++someNumber % endpoints.size();
for (int i = 0; i < endpoints.size(); i++) {
Endpoint endpoint = endpoints.get((i + start) % endpoints.size());
int inflight = endpoint.inflight.get();
if (inflight < min) {
leastBusy = endpoint;
min = inflight;
}
}
Endpoint endpoint = leastBusy;
endpoint.inflight.incrementAndGet();
dispatchExecutor.execute(() -> {
try {
SimpleHttpRequest request = new SimpleHttpRequest(wrapped.method(), wrapped.path());
request.setScheme(endpoint.url.getScheme());
request.setAuthority(new URIAuthority(endpoint.url.getHost(), portOf(endpoint.url)));
long timeoutMillis = wrapped.timeout() == null ? 190_000 : wrapped.timeout().toMillis() * 11 / 10 + 1_000;
request.setConfig(RequestConfig.copy(requestConfig).setResponseTimeout(Timeout.ofMilliseconds(timeoutMillis)).build());
defaultHeaders.forEach(request::setHeader);
wrapped.headers().forEach((name, value) -> request.setHeader(name, value.get()));
if (wrapped.body() != null) {
byte[] body = wrapped.body();
if (compression == gzip || compression == auto && body.length > 512) {
request.setHeader(gzipEncodingHeader);
body = gzipped(body);
}
request.setBody(body, ContentType.APPLICATION_JSON);
}
Future<?> future = endpoint.client.execute(request,
new FutureCallback<SimpleHttpResponse>() {
@Override public void completed(SimpleHttpResponse response) { vessel.complete(new ApacheHttpResponse(response)); }
@Override public void failed(Exception ex) { vessel.completeExceptionally(ex); }
@Override public void cancelled() { vessel.cancel(false); }
});
// We've seen some requests time out, even with a response timeout,
// so we schedule this to be absolutely sure we don't hang (for ever).
Future<?> cancellation = timeoutExecutor.schedule(() -> { future.cancel(true); vessel.cancel(true); },
timeoutMillis + 10_000,
TimeUnit.MILLISECONDS);
vessel.whenComplete((__, ___) -> cancellation.cancel(true));
}
catch (Throwable thrown) {
vessel.completeExceptionally(thrown);
}
vessel.whenComplete((__, ___) -> endpoint.inflight.decrementAndGet());
});
}
private byte[] gzipped(byte[] content) throws IOException{
ByteArrayOutputStream buffer = new ByteArrayOutputStream(1 << 10);
try (GZIPOutputStream zip = new GZIPOutputStream(buffer)) {
zip.write(content);
}
return buffer.toByteArray();
}
@Override
public void close() {
Throwable thrown = null;
dispatchExecutor.shutdownNow().forEach(Runnable::run);
for (Endpoint endpoint : endpoints) {
try {
endpoint.client.close();
}
catch (Throwable t) {
if (thrown == null) thrown = t;
else thrown.addSuppressed(t);
}
}
timeoutExecutor.shutdownNow().forEach(Runnable::run);
if (thrown != null) throw new RuntimeException(thrown);
}
private static class Endpoint {
private final CloseableHttpAsyncClient client;
private final AtomicInteger inflight = new AtomicInteger(0);
private final URI url;
private Endpoint(CloseableHttpAsyncClient client, URI url) {
this.client = client;
this.url = url;
this.client.start();
}
}
@SuppressWarnings("deprecation")
private static CloseableHttpAsyncClient createHttpClient(FeedClientBuilderImpl builder) throws IOException {
SSLContext sslContext = builder.constructSslContext();
String[] allowedCiphers = excludeH2Blacklisted(excludeWeak(sslContext.getSupportedSSLParameters().getCipherSuites()));
if (allowedCiphers.length == 0)
throw new IllegalStateException("No adequate SSL cipher suites supported by the JVM");
ClientTlsStrategyBuilder tlsStrategyBuilder = ClientTlsStrategyBuilder.create()
.setTlsDetailsFactory(TlsDetailsFactory::create)
.setCiphers(allowedCiphers)
.setSslContext(sslContext);
if (builder.hostnameVerifier != null)
tlsStrategyBuilder.setHostnameVerifier(builder.hostnameVerifier);
return HttpAsyncClients.createHttp2Minimal(H2Config.custom()
.setMaxConcurrentStreams(builder.maxStreamsPerConnection)
.setCompressionEnabled(true)
.setPushEnabled(false)
.setInitialWindowSize(Integer.MAX_VALUE)
.build(),
IOReactorConfig.custom()
.setIoThreadCount(2)
.setTcpNoDelay(true)
.setSoTimeout(Timeout.ofSeconds(10))
.build(),
tlsStrategyBuilder.build());
}
private static int portOf(URI url) {
return url.getPort() == -1 ? url.getScheme().equals("http") ? 80 : 443
: url.getPort();
}
@SuppressWarnings("deprecation")
private static RequestConfig createRequestConfig(FeedClientBuilderImpl b) {
RequestConfig.Builder builder = RequestConfig.custom()
.setConnectTimeout(Timeout.ofSeconds(10))
.setConnectionRequestTimeout(Timeout.DISABLED);
if (b.proxy != null) builder.setProxy(new HttpHost(b.proxy.getScheme(), b.proxy.getHost(), b.proxy.getPort()));
return builder.build();
}
private static class ApacheHttpResponse implements HttpResponse {
private final SimpleHttpResponse wrapped;
private ApacheHttpResponse(SimpleHttpResponse wrapped) {
this.wrapped = wrapped;
}
@Override
public int code() {
return wrapped.getCode();
}
@Override
public byte[] body() {
return wrapped.getBodyBytes();
}
@Override
public String contentType() {
return wrapped.getContentType().getMimeType();
}
@Override
public String toString() {
return "HTTP response with code " + code() +
(body() != null ? " and body '" + wrapped.getBodyText() + "'" : "");
}
}
}
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