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DefaultHttpPushFactory.java
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DefaultHttpPushFactory.java
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/*
* Copyright (c) 2019 Contributors to the Eclipse Foundation
*
* See the NOTICE file(s) distributed with this work for additional
* information regarding copyright ownership.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*/
package org.eclipse.ditto.connectivity.service.messaging.httppush;
import java.time.Duration;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeoutException;
import java.util.function.BiConsumer;
import java.util.function.Supplier;
import javax.annotation.Nullable;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLEngine;
import org.eclipse.ditto.base.model.headers.DittoHeaders;
import org.eclipse.ditto.connectivity.model.Connection;
import org.eclipse.ditto.connectivity.model.ConnectionId;
import org.eclipse.ditto.connectivity.service.config.HttpPushConfig;
import org.eclipse.ditto.connectivity.service.messaging.internal.ssl.SSLContextCreator;
import org.eclipse.ditto.connectivity.service.messaging.monitoring.ConnectionMonitor;
import org.eclipse.ditto.connectivity.service.messaging.monitoring.logs.ConnectionLogger;
import org.eclipse.ditto.connectivity.service.messaging.tunnel.SshTunnelState;
import org.eclipse.ditto.internal.utils.pekko.controlflow.TimeoutFlow;
import org.eclipse.ditto.internal.utils.metrics.instruments.timer.PreparedTimer;
import org.eclipse.ditto.internal.utils.metrics.instruments.timer.StartedTimer;
import org.apache.pekko.actor.ActorSystem;
import org.apache.pekko.event.LoggingAdapter;
import org.apache.pekko.http.javadsl.ClientTransport;
import org.apache.pekko.http.javadsl.ConnectHttp;
import org.apache.pekko.http.javadsl.ConnectionContext;
import org.apache.pekko.http.javadsl.Http;
import org.apache.pekko.http.javadsl.HttpsConnectionContext;
import org.apache.pekko.http.javadsl.model.HttpRequest;
import org.apache.pekko.http.javadsl.model.HttpResponse;
import org.apache.pekko.http.javadsl.model.Uri;
import org.apache.pekko.http.javadsl.model.headers.HttpCredentials;
import org.apache.pekko.http.javadsl.settings.ClientConnectionSettings;
import org.apache.pekko.http.javadsl.settings.ConnectionPoolSettings;
import org.apache.pekko.http.javadsl.settings.ParserSettings;
import org.apache.pekko.japi.Pair;
import org.apache.pekko.stream.javadsl.Flow;
import scala.util.Failure;
import scala.util.Try;
/**
* Default implementation of {@link HttpPushFactory}.
*/
final class DefaultHttpPushFactory implements HttpPushFactory {
private static final String PATH_DELIMITER = "/";
/**
* Config key of the dispatcher for http push connections.
*/
private static final String DISPATCHER_NAME = "http-push-connection-dispatcher";
private final Connection connection;
private final int parallelism;
private final Supplier<SshTunnelState> tunnelConfigSupplier;
@Nullable
private final ClientTransport clientTransport;
@Nullable
private final HttpsConnectionContext httpsConnectionContext;
private DefaultHttpPushFactory(final Connection connection, final int parallelism,
final HttpPushConfig httpPushConfig, @Nullable final HttpsConnectionContext httpsConnectionContext,
final Supplier<SshTunnelState> tunnelConfigSupplier) {
this.connection = connection;
this.parallelism = parallelism;
this.tunnelConfigSupplier = tunnelConfigSupplier;
if (!httpPushConfig.getHttpProxyConfig().isEnabled()) {
clientTransport = null;
} else {
clientTransport = httpPushConfig.getHttpProxyConfig().toClientTransport();
}
this.httpsConnectionContext = httpsConnectionContext;
}
static HttpPushFactory of(final Connection connection, final HttpPushConfig httpPushConfig,
final ConnectionLogger connectionLogger, final Supplier<SshTunnelState> tunnelConfigSupplier) {
final Uri baseUri = Uri.create(connection.getUri());
final var httpPushSpecificConfig = HttpPushSpecificConfig.fromConnection(connection, httpPushConfig);
final int parallelism = parseParallelism(httpPushSpecificConfig);
final HttpsConnectionContext httpsConnectionContext;
if (HttpPushValidator.isSecureScheme(baseUri.getScheme())) {
final SSLContextCreator sslContextCreator =
SSLContextCreator.fromConnection(connection, DittoHeaders.empty(), connectionLogger);
final SSLContext sslContext = connection.getCredentials()
.map(credentials -> credentials.accept(sslContextCreator))
.orElse(sslContextCreator.withoutClientCertificate());
if (connection.isValidateCertificates()) {
httpsConnectionContext = ConnectionContext.httpsClient(sslContext);
} else {
httpsConnectionContext = ConnectionContext.httpsClient((host, port) -> {
// This creates an SSL Engine without hostname verification.
final SSLEngine engine = sslContext.createSSLEngine(host, port);
engine.setUseClientMode(true);
return engine;
});
}
} else {
httpsConnectionContext = null;
}
return new DefaultHttpPushFactory(connection, parallelism, httpPushConfig, httpsConnectionContext,
tunnelConfigSupplier);
}
@Override
public HttpRequest newRequest(final HttpPublishTarget httpPublishTarget) {
final Uri baseUri = getBaseUri();
final String baseUriStrToUse = determineBaseUri(baseUri);
final String pathWithQueryToUse = determineHttpPath(httpPublishTarget);
final String userInfo = baseUri.getUserInfo();
final int passwordSeparatorLocation = userInfo.indexOf(':');
final HttpRequest request = HttpRequest.create()
.withMethod(httpPublishTarget.getMethod())
.withUri(Uri.create(baseUriStrToUse + pathWithQueryToUse));
if (passwordSeparatorLocation >= 0) {
final String username = userInfo.substring(0, passwordSeparatorLocation);
final String password = userInfo.substring(Math.min(userInfo.length(), passwordSeparatorLocation + 1));
return request.addCredentials(HttpCredentials.createBasicHttpCredentials(username, password));
} else {
return request;
}
}
private Uri getBaseUri() {
return Uri.create(tunnelConfigSupplier.get().getURI(connection).toString());
}
private static String determineBaseUri(final Uri baseUri) {
final String baseUriStr = baseUri.toString();
final String baseUriStrToUse;
if (baseUriStr.endsWith(PATH_DELIMITER)) {
// avoid double "/", so cut it off at the baseUri to use:
baseUriStrToUse = baseUriStr.substring(0, baseUriStr.length() - 1);
} else {
baseUriStrToUse = baseUriStr;
}
return baseUriStrToUse;
}
private static String determineHttpPath(final HttpPublishTarget httpPublishTarget) {
final String pathWithQuery = httpPublishTarget.getPathWithQuery();
final String pathWithQueryToUse;
if (pathWithQuery.startsWith(PATH_DELIMITER) || pathWithQuery.startsWith("?") ||
pathWithQuery.startsWith("#")) {
pathWithQueryToUse = pathWithQuery;
} else {
pathWithQueryToUse = PATH_DELIMITER + pathWithQuery;
}
return pathWithQueryToUse;
}
@Override
public Flow<Pair<HttpRequest, HttpPushContext>, Pair<Try<HttpResponse>, HttpPushContext>, ?> createFlow(
final ActorSystem system,
final LoggingAdapter log,
final Duration requestTimeout,
@Nullable final PreparedTimer timer,
@Nullable final BiConsumer<Duration, ConnectionMonitor.InfoProvider> durationConsumer) {
final Http http = Http.get(system);
final ConnectionPoolSettings poolSettings = getConnectionPoolSettings(system);
final Flow<Pair<HttpRequest, HttpPushContext>, Pair<Try<HttpResponse>, HttpPushContext>, ?> flow;
final Uri baseUri = getBaseUri();
if (null != httpsConnectionContext) {
final ConnectHttp connectHttpsWithCustomSSLContext =
ConnectHttp.toHostHttps(baseUri).withCustomHttpsContext(httpsConnectionContext);
// explicitly added <T> as in (some?) IntelliJ idea the line would show an error:
flow = http.<HttpPushContext>cachedHostConnectionPoolHttps(connectHttpsWithCustomSSLContext, poolSettings, log);
} else {
// explicitly added <T> as in (some?) IntelliJ idea the line would show an error:
// no SSL, hence no need for SSLContextCreator
flow = http.<HttpPushContext>cachedHostConnectionPool(ConnectHttp.toHost(baseUri), poolSettings, log);
}
// make requests in parallel
return Flow.<Pair<HttpRequest, HttpPushContext>>create().flatMapMerge(parallelism, request -> {
final var startedTimer = timer != null ? timer.start() : null;
return TimeoutFlow.single(request, flow, requestTimeout, DefaultHttpPushFactory::onRequestTimeout)
.map(pair -> {
stopTimer(startedTimer, durationConsumer, pair.second().getInfoProvider(), log);
return pair;
})
.async(DISPATCHER_NAME, parallelism);
});
}
private void stopTimer(@Nullable final StartedTimer startedTimer,
@Nullable final BiConsumer<Duration, ConnectionMonitor.InfoProvider> durationConsumer,
final ConnectionMonitor.InfoProvider infoProvider,
final LoggingAdapter log) {
try {
if (startedTimer != null) {
final var stoppedTimer = startedTimer.stop();
if (durationConsumer != null) {
durationConsumer.accept(stoppedTimer.getDuration(), infoProvider);
}
}
} catch (final IllegalStateException e) {
log.debug("Ignoring exception due to stopping a stopped timer <{}>: <{}>", startedTimer, e);
}
}
private ConnectionPoolSettings getConnectionPoolSettings(final ActorSystem system) {
final ConnectionPoolSettings settings =
disambiguateByConnectionId(system, connection.getId()).withMaxConnections(parallelism);
return clientTransport == null
? settings
: settings.withTransport(clientTransport);
}
private static <T> Pair<Try<HttpResponse>, T> onRequestTimeout(final Pair<HttpRequest, T> requestPair) {
final Try<HttpResponse> failure =
new Failure<>(new TimeoutException("Request timed out: " + requestPair.first().getUri()));
return Pair.create(failure, requestPair.second());
}
/**
* Create connection pool settings unique for the connection ID but functionally identical for
* identically configured connections.
*
* @param system the actor system that runs this HTTP-push factory.
* @param id the connection ID.
* @return artificially unique connection pool settings.
*/
private static ConnectionPoolSettings disambiguateByConnectionId(final ActorSystem system, final ConnectionId id) {
final ParserSettings parserSettings = ParserSettings.forClient(system);
// start with the default maximum cached value per header of Pekko HTTP.
// "default=12" should be kept consistent with akka-http reference.conf
final Map<String, Object> disambiguator = new HashMap<>(parserSettings.getHeaderValueCacheLimits());
disambiguator.put(id.toString(), disambiguator.getOrDefault("default", 12));
return ConnectionPoolSettings.create(system)
.withConnectionSettings(ClientConnectionSettings.create(system)
.withParserSettings(parserSettings.withHeaderValueCacheLimits(disambiguator)));
}
static int parseParallelism(final HttpPushSpecificConfig specificConfig) {
return determineNextPowerOfTwo(specificConfig.parallelism());
}
private static int determineNextPowerOfTwo(final int parallelism) {
return parallelism == 1 ? 1 : Integer.highestOneBit(parallelism - 1) * 2;
}
}