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org.apache.kafka.connect.runtime.rest.RestServer Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.kafka.connect.runtime.rest;
import com.fasterxml.jackson.jaxrs.json.JacksonJsonProvider;
import org.apache.kafka.common.config.ConfigException;
import org.apache.kafka.connect.errors.ConnectException;
import org.apache.kafka.connect.rest.ConnectRestExtension;
import org.apache.kafka.connect.rest.ConnectRestExtensionContext;
import org.apache.kafka.connect.runtime.HerderProvider;
import org.apache.kafka.connect.runtime.WorkerConfig;
import org.apache.kafka.connect.runtime.health.ConnectClusterStateImpl;
import org.apache.kafka.connect.runtime.isolation.Plugins;
import org.apache.kafka.connect.runtime.rest.errors.ConnectExceptionMapper;
import org.apache.kafka.connect.runtime.rest.resources.ConnectorPluginsResource;
import org.apache.kafka.connect.runtime.rest.resources.ConnectorsResource;
import org.apache.kafka.connect.runtime.rest.resources.RootResource;
import org.apache.kafka.connect.runtime.rest.util.SSLUtils;
import org.eclipse.jetty.server.Connector;
import org.eclipse.jetty.server.Handler;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.ServerConnector;
import org.eclipse.jetty.server.Slf4jRequestLog;
import org.eclipse.jetty.server.handler.DefaultHandler;
import org.eclipse.jetty.server.handler.HandlerCollection;
import org.eclipse.jetty.server.handler.RequestLogHandler;
import org.eclipse.jetty.server.handler.StatisticsHandler;
import org.eclipse.jetty.servlet.FilterHolder;
import org.eclipse.jetty.servlet.ServletContextHandler;
import org.eclipse.jetty.servlet.ServletHolder;
import org.eclipse.jetty.servlets.CrossOriginFilter;
import org.eclipse.jetty.util.ssl.SslContextFactory;
import org.glassfish.jersey.server.ResourceConfig;
import org.glassfish.jersey.server.ServerProperties;
import org.glassfish.jersey.servlet.ServletContainer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.servlet.DispatcherType;
import javax.ws.rs.core.UriBuilder;
import java.io.IOException;
import java.net.URI;
import java.util.ArrayList;
import java.util.Collections;
import java.util.EnumSet;
import java.util.List;
import java.util.Locale;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Embedded server for the REST API that provides the control plane for Kafka Connect workers.
*/
public class RestServer {
private static final Logger log = LoggerFactory.getLogger(RestServer.class);
private static final Pattern LISTENER_PATTERN = Pattern.compile("^(.*)://\\[?([0-9a-zA-Z\\-%._:]*)\\]?:(-?[0-9]+)");
private static final long GRACEFUL_SHUTDOWN_TIMEOUT_MS = 60 * 1000;
private static final String PROTOCOL_HTTP = "http";
private static final String PROTOCOL_HTTPS = "https";
private final WorkerConfig config;
private Server jettyServer;
private List connectRestExtensions = Collections.emptyList();
/**
* Create a REST server for this herder using the specified configs.
*/
public RestServer(WorkerConfig config) {
this.config = config;
List listeners = parseListeners();
jettyServer = new Server();
createConnectors(listeners);
}
@SuppressWarnings("deprecation")
List parseListeners() {
List listeners = config.getList(WorkerConfig.LISTENERS_CONFIG);
if (listeners == null || listeners.size() == 0) {
String hostname = config.getString(WorkerConfig.REST_HOST_NAME_CONFIG);
if (hostname == null)
hostname = "";
listeners = Collections.singletonList(String.format("%s://%s:%d", PROTOCOL_HTTP, hostname, config.getInt(WorkerConfig.REST_PORT_CONFIG)));
}
return listeners;
}
/**
* Adds Jetty connector for each configured listener
*/
public void createConnectors(List listeners) {
List connectors = new ArrayList<>();
for (String listener : listeners) {
if (!listener.isEmpty()) {
Connector connector = createConnector(listener);
connectors.add(connector);
log.info("Added connector for " + listener);
}
}
jettyServer.setConnectors(connectors.toArray(new Connector[connectors.size()]));
}
/**
* Creates Jetty connector according to configuration
*/
public Connector createConnector(String listener) {
Matcher listenerMatcher = LISTENER_PATTERN.matcher(listener);
if (!listenerMatcher.matches())
throw new ConfigException("Listener doesn't have the right format (protocol://hostname:port).");
String protocol = listenerMatcher.group(1).toLowerCase(Locale.ENGLISH);
if (!PROTOCOL_HTTP.equals(protocol) && !PROTOCOL_HTTPS.equals(protocol))
throw new ConfigException(String.format("Listener protocol must be either \"%s\" or \"%s\".", PROTOCOL_HTTP, PROTOCOL_HTTPS));
String hostname = listenerMatcher.group(2);
int port = Integer.parseInt(listenerMatcher.group(3));
ServerConnector connector;
if (PROTOCOL_HTTPS.equals(protocol)) {
SslContextFactory ssl = SSLUtils.createSslContextFactory(config);
connector = new ServerConnector(jettyServer, ssl);
connector.setName(String.format("%s_%s%d", PROTOCOL_HTTPS, hostname, port));
} else {
connector = new ServerConnector(jettyServer);
connector.setName(String.format("%s_%s%d", PROTOCOL_HTTP, hostname, port));
}
if (!hostname.isEmpty())
connector.setHost(hostname);
connector.setPort(port);
return connector;
}
public void start(HerderProvider herderProvider, Plugins plugins) {
log.info("Starting REST server");
ResourceConfig resourceConfig = new ResourceConfig();
resourceConfig.register(new JacksonJsonProvider());
resourceConfig.register(new RootResource(herderProvider));
resourceConfig.register(new ConnectorsResource(herderProvider, config));
resourceConfig.register(new ConnectorPluginsResource(herderProvider));
resourceConfig.register(ConnectExceptionMapper.class);
resourceConfig.property(ServerProperties.WADL_FEATURE_DISABLE, true);
registerRestExtensions(herderProvider, plugins, resourceConfig);
ServletContainer servletContainer = new ServletContainer(resourceConfig);
ServletHolder servletHolder = new ServletHolder(servletContainer);
ServletContextHandler context = new ServletContextHandler(ServletContextHandler.SESSIONS);
context.setContextPath("/");
context.addServlet(servletHolder, "/*");
String allowedOrigins = config.getString(WorkerConfig.ACCESS_CONTROL_ALLOW_ORIGIN_CONFIG);
if (allowedOrigins != null && !allowedOrigins.trim().isEmpty()) {
FilterHolder filterHolder = new FilterHolder(new CrossOriginFilter());
filterHolder.setName("cross-origin");
filterHolder.setInitParameter(CrossOriginFilter.ALLOWED_ORIGINS_PARAM, allowedOrigins);
String allowedMethods = config.getString(WorkerConfig.ACCESS_CONTROL_ALLOW_METHODS_CONFIG);
if (allowedMethods != null && !allowedOrigins.trim().isEmpty()) {
filterHolder.setInitParameter(CrossOriginFilter.ALLOWED_METHODS_PARAM, allowedMethods);
}
context.addFilter(filterHolder, "/*", EnumSet.of(DispatcherType.REQUEST));
}
RequestLogHandler requestLogHandler = new RequestLogHandler();
Slf4jRequestLog requestLog = new Slf4jRequestLog();
requestLog.setLoggerName(RestServer.class.getCanonicalName());
requestLog.setLogLatency(true);
requestLogHandler.setRequestLog(requestLog);
HandlerCollection handlers = new HandlerCollection();
handlers.setHandlers(new Handler[]{context, new DefaultHandler(), requestLogHandler});
/* Needed for graceful shutdown as per `setStopTimeout` documentation */
StatisticsHandler statsHandler = new StatisticsHandler();
statsHandler.setHandler(handlers);
jettyServer.setHandler(statsHandler);
jettyServer.setStopTimeout(GRACEFUL_SHUTDOWN_TIMEOUT_MS);
jettyServer.setStopAtShutdown(true);
try {
jettyServer.start();
} catch (Exception e) {
throw new ConnectException("Unable to start REST server", e);
}
log.info("REST server listening at " + jettyServer.getURI() + ", advertising URL " + advertisedUrl());
}
public URI serverUrl() {
return jettyServer.getURI();
}
public void stop() {
log.info("Stopping REST server");
try {
for (ConnectRestExtension connectRestExtension : connectRestExtensions) {
try {
connectRestExtension.close();
} catch (IOException e) {
log.warn("Error while invoking close on " + connectRestExtension.getClass(), e);
}
}
jettyServer.stop();
jettyServer.join();
} catch (Exception e) {
throw new ConnectException("Unable to stop REST server", e);
} finally {
jettyServer.destroy();
}
log.info("REST server stopped");
}
/**
* Get the URL to advertise to other workers and clients. This uses the default connector from the embedded Jetty
* server, unless overrides for advertised hostname and/or port are provided via configs.
*/
public URI advertisedUrl() {
UriBuilder builder = UriBuilder.fromUri(jettyServer.getURI());
String advertisedSecurityProtocol = determineAdvertisedProtocol();
ServerConnector serverConnector = findConnector(advertisedSecurityProtocol);
builder.scheme(advertisedSecurityProtocol);
String advertisedHostname = config.getString(WorkerConfig.REST_ADVERTISED_HOST_NAME_CONFIG);
if (advertisedHostname != null && !advertisedHostname.isEmpty())
builder.host(advertisedHostname);
else if (serverConnector != null && serverConnector.getHost() != null && serverConnector.getHost().length() > 0)
builder.host(serverConnector.getHost());
Integer advertisedPort = config.getInt(WorkerConfig.REST_ADVERTISED_PORT_CONFIG);
if (advertisedPort != null)
builder.port(advertisedPort);
else if (serverConnector != null && serverConnector.getPort() > 0)
builder.port(serverConnector.getPort());
log.info("Advertised URI: {}", builder.build());
return builder.build();
}
String determineAdvertisedProtocol() {
String advertisedSecurityProtocol = config.getString(WorkerConfig.REST_ADVERTISED_LISTENER_CONFIG);
if (advertisedSecurityProtocol == null) {
String listeners = (String) config.originals().get(WorkerConfig.LISTENERS_CONFIG);
if (listeners == null)
return PROTOCOL_HTTP;
else
listeners = listeners.toLowerCase(Locale.ENGLISH);
if (listeners.contains(String.format("%s://", PROTOCOL_HTTP)))
return PROTOCOL_HTTP;
else if (listeners.contains(String.format("%s://", PROTOCOL_HTTPS)))
return PROTOCOL_HTTPS;
else
return PROTOCOL_HTTP;
} else {
return advertisedSecurityProtocol.toLowerCase(Locale.ENGLISH);
}
}
ServerConnector findConnector(String protocol) {
for (Connector connector : jettyServer.getConnectors()) {
if (connector.getName().startsWith(protocol))
return (ServerConnector) connector;
}
return null;
}
void registerRestExtensions(HerderProvider provider, Plugins plugins, ResourceConfig resourceConfig) {
connectRestExtensions = plugins.newPlugins(
config.getList(WorkerConfig.REST_EXTENSION_CLASSES_CONFIG),
config, ConnectRestExtension.class);
ConnectRestExtensionContext connectRestExtensionContext =
new ConnectRestExtensionContextImpl(
new ConnectRestConfigurable(resourceConfig),
new ConnectClusterStateImpl(provider)
);
for (ConnectRestExtension connectRestExtension : connectRestExtensions) {
connectRestExtension.register(connectRestExtensionContext);
}
}
public static String urlJoin(String base, String path) {
if (base.endsWith("/") && path.startsWith("/"))
return base + path.substring(1);
else
return base + path;
}
}
