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// Copyright Verizon Media. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package ai.vespa.feed.client;
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.H2AsyncClientBuilder;
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.message.BasicHeader;
import org.apache.hc.core5.http2.config.H2Config;
import org.apache.hc.core5.net.URIBuilder;
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.io.PrintStream;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.function.Supplier;
import static java.util.Objects.requireNonNull;
import static org.apache.hc.core5.http.ssl.TlsCiphers.excludeH2Blacklisted;
import static org.apache.hc.core5.http.ssl.TlsCiphers.excludeWeak;
/**
* HTTP implementation of {@link FeedClient}
*
* @author bjorncs
* @author jonmv
*/
class HttpFeedClient implements FeedClient {
private final URI endpoint;
private final Map<String, Supplier<String>> requestHeaders;
private final RequestStrategy requestStrategy;
private final List<CloseableHttpAsyncClient> httpClients = new ArrayList<>();
private final List<AtomicInteger> inflight = new ArrayList<>();
private final AtomicBoolean closed = new AtomicBoolean();
HttpFeedClient(FeedClientBuilder builder) throws IOException {
this.endpoint = builder.endpoint;
this.requestHeaders = new HashMap<>(builder.requestHeaders);
this.requestStrategy = new HttpRequestStrategy(builder);
for (int i = 0; i < builder.maxConnections; i++) {
CloseableHttpAsyncClient client = createHttpClient(builder);
client.start();
httpClients.add(client);
inflight.add(new AtomicInteger());
}
}
private static CloseableHttpAsyncClient createHttpClient(FeedClientBuilder builder) throws IOException {
H2AsyncClientBuilder httpClientBuilder = H2AsyncClientBuilder.create()
.setUserAgent(String.format("vespa-feed-client/%s", Vespa.VERSION))
.setDefaultHeaders(Collections.singletonList(new BasicHeader("Vespa-Client-Version", Vespa.VERSION)))
.disableCookieManagement()
.disableRedirectHandling()
.disableAutomaticRetries()
.setIOReactorConfig(IOReactorConfig.custom()
.setSoTimeout(Timeout.ofSeconds(10))
.build())
.setDefaultRequestConfig(
RequestConfig.custom()
.setConnectTimeout(Timeout.ofSeconds(10))
.setConnectionRequestTimeout(Timeout.DISABLED)
.setResponseTimeout(Timeout.ofMinutes(5))
.build())
.setH2Config(H2Config.initial()
.setMaxConcurrentStreams(builder.maxStreamsPerConnection)
.setCompressionEnabled(true)
.setPushEnabled(false)
.build());
SSLContext sslContext = constructSslContext(builder);
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()
.setCiphers(allowedCiphers)
.setSslContext(sslContext);
if (builder.hostnameVerifier != null) {
tlsStrategyBuilder.setHostnameVerifier(builder.hostnameVerifier);
}
return httpClientBuilder.setTlsStrategy(tlsStrategyBuilder.build())
.build();
}
private static SSLContext constructSslContext(FeedClientBuilder builder) throws IOException {
if (builder.sslContext != null) return builder.sslContext;
SslContextBuilder sslContextBuilder = new SslContextBuilder();
if (builder.certificate != null && builder.privateKey != null) {
sslContextBuilder.withCertificateAndKey(builder.certificate, builder.privateKey);
}
if (builder.caCertificates != null) {
sslContextBuilder.withCaCertificates(builder.caCertificates);
}
return sslContextBuilder.build();
}
@Override
public CompletableFuture<Result> put(DocumentId documentId, String documentJson, OperationParameters params) {
return send("POST", documentId, requireNonNull(documentJson), params);
}
@Override
public CompletableFuture<Result> update(DocumentId documentId, String updateJson, OperationParameters params) {
return send("PUT", documentId, requireNonNull(updateJson), params);
}
@Override
public CompletableFuture<Result> remove(DocumentId documentId, OperationParameters params) {
return send("DELETE", documentId, null, params);
}
@Override
public void close() throws IOException {
if ( ! closed.getAndSet(true))
for (CloseableHttpAsyncClient hc : httpClients)
hc.close();
}
private CompletableFuture<Result> send(String method, DocumentId documentId, String operationJson, OperationParameters params) {
SimpleHttpRequest request = new SimpleHttpRequest(method, operationUrl(endpoint, documentId, params));
requestHeaders.forEach((name, value) -> request.setHeader(name, value.get()));
if (operationJson != null)
request.setBody(operationJson, ContentType.APPLICATION_JSON);
return requestStrategy.enqueue(documentId, request, this::send)
.handle((response, thrown) -> {
if (thrown != null) {
if (requestStrategy.hasFailed()) {
try { close(); }
catch (IOException exception) { thrown.addSuppressed(exception); }
}
ByteArrayOutputStream buffer = new ByteArrayOutputStream();
thrown.printStackTrace(new PrintStream(buffer));
return new Result(Result.Type.failure, documentId, buffer.toString(), null);
}
return toResult(response, documentId);
});
}
/** Sends the given request to the client with the least current inflight requests, completing the given vessel when done. */
private void send(SimpleHttpRequest request, CompletableFuture<SimpleHttpResponse> vessel) {
int index = 0;
int min = Integer.MAX_VALUE;
for (int i = 0; i < httpClients.size(); i++)
if (inflight.get(i).get() < min) {
min = inflight.get(i).get();
index = i;
}
inflight.get(index).incrementAndGet();
try {
httpClients.get(index).execute(request,
new FutureCallback<SimpleHttpResponse>() {
@Override public void completed(SimpleHttpResponse response) { vessel.complete(response); }
@Override public void failed(Exception ex) { vessel.completeExceptionally(ex); }
@Override public void cancelled() { vessel.cancel(false); }
});
}
catch (Throwable thrown) {
vessel.completeExceptionally(thrown);
}
vessel.thenRun(inflight.get(index)::decrementAndGet);
}
static Result toResult(SimpleHttpResponse response, DocumentId documentId) {
Result.Type type;
switch (response.getCode()) {
case 200: type = Result.Type.success; break;
case 412: type = Result.Type.conditionNotMet; break;
default: type = Result.Type.failure;
}
Map<String, String> responseJson = null; // TODO: parse JSON on error.
return new Result(type, documentId, response.getBodyText(), "trace");
}
static List<String> toPath(DocumentId documentId) {
List<String> path = new ArrayList<>();
path.add("document");
path.add("v1");
path.add(documentId.namespace());
path.add(documentId.documentType());
if (documentId.number().isPresent()) {
path.add("number");
path.add(Long.toUnsignedString(documentId.number().getAsLong()));
}
else if (documentId.group().isPresent()) {
path.add("group");
path.add(documentId.group().get());
}
else {
path.add("docid");
}
path.add(documentId.userSpecific());
return path;
}
static URI operationUrl(URI endpoint, DocumentId documentId, OperationParameters params) {
URIBuilder url = new URIBuilder(endpoint);
url.setPathSegments(toPath(documentId));
if (params.createIfNonExistent()) url.addParameter("create", "true");
params.testAndSetCondition().ifPresent(condition -> url.addParameter("condition", condition));
params.timeout().ifPresent(timeout -> url.addParameter("timeout", timeout.toMillis() + "ms"));
params.route().ifPresent(route -> url.addParameter("route", route));
params.tracelevel().ifPresent(tracelevel -> url.addParameter("tracelevel", Integer.toString(tracelevel)));
try {
return url.build();
}
catch (URISyntaxException e) {
throw new IllegalStateException(e);
}
}
}
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