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/*
* Copyright (C) 2020 Graylog, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* .
*/
package org.graylog2.inputs.transports;
import com.codahale.metrics.MetricSet;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.Maps;
import com.google.common.eventbus.EventBus;
import com.google.common.eventbus.Subscribe;
import com.google.inject.assistedinject.Assisted;
import com.google.inject.assistedinject.AssistedInject;
import okhttp3.Headers;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import org.graylog2.plugin.ServerStatus;
import org.graylog2.plugin.configuration.Configuration;
import org.graylog2.plugin.configuration.ConfigurationRequest;
import org.graylog2.plugin.configuration.fields.ConfigurationField;
import org.graylog2.plugin.configuration.fields.DropdownField;
import org.graylog2.plugin.configuration.fields.NumberField;
import org.graylog2.plugin.configuration.fields.TextField;
import org.graylog2.plugin.inputs.MessageInput;
import org.graylog2.plugin.inputs.MisfireException;
import org.graylog2.plugin.inputs.annotations.ConfigClass;
import org.graylog2.plugin.inputs.annotations.FactoryClass;
import org.graylog2.plugin.inputs.codecs.CodecAggregator;
import org.graylog2.plugin.inputs.transports.ThrottleableTransport;
import org.graylog2.plugin.inputs.transports.Transport;
import org.graylog2.plugin.journal.RawMessage;
import org.graylog2.plugin.lifecycles.Lifecycle;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.inject.Named;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Collections;
import java.util.Map;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;
import static com.google.common.base.Strings.isNullOrEmpty;
public class HttpPollTransport extends ThrottleableTransport {
private static final Logger LOG = LoggerFactory.getLogger(HttpPollTransport.class);
private static final String CK_URL = "target_url";
private static final String CK_HEADERS = "headers";
private static final String CK_TIMEUNIT = "timeunit";
private static final String CK_INTERVAL = "interval";
private final Configuration configuration;
private final EventBus serverEventBus;
private final ServerStatus serverStatus;
private final ScheduledExecutorService scheduler;
private final OkHttpClient httpClient;
private volatile boolean paused = true;
private ScheduledFuture scheduledFuture;
@AssistedInject
public HttpPollTransport(@Assisted Configuration configuration,
EventBus serverEventBus,
ServerStatus serverStatus,
@Named("daemonScheduler") ScheduledExecutorService scheduler,
OkHttpClient httpClient) {
super(serverEventBus, configuration);
this.configuration = configuration;
this.serverEventBus = serverEventBus;
this.serverStatus = serverStatus;
this.scheduler = scheduler;
this.httpClient = httpClient;
}
@VisibleForTesting
static Map parseHeaders(String headerString) {
if (isNullOrEmpty(headerString)) {
return Collections.emptyMap();
}
final Map headers = Maps.newHashMap();
for (String headerPart : headerString.trim().split(",")) {
final String[] parts = headerPart.trim().split(":");
if (parts.length == 2) {
headers.put(parts[0].trim(), parts[1].trim());
}
}
return headers;
}
@Subscribe
public void lifecycleStateChange(Lifecycle lifecycle) {
LOG.debug("Lifecycle changed to {}", lifecycle);
switch (lifecycle) {
case RUNNING:
paused = false;
break;
default:
paused = true;
}
}
@Override
public void setMessageAggregator(CodecAggregator aggregator) {
// not supported
}
@Override
public void doLaunch(final MessageInput input) throws MisfireException {
serverStatus.awaitRunning(() -> lifecycleStateChange(Lifecycle.RUNNING));
// listen for lifecycle changes
serverEventBus.register(this);
final Map headers = parseHeaders(configuration.getString(CK_HEADERS));
// figure out a reasonable remote address
final String url = configuration.getString(CK_URL);
final InetSocketAddress remoteAddress;
InetSocketAddress remoteAddress1;
try {
final URL url1 = new URL(url);
final int port = url1.getPort();
remoteAddress1 = new InetSocketAddress(url1.getHost(), port != -1 ? port : 80);
} catch (MalformedURLException e) {
remoteAddress1 = null;
}
remoteAddress = remoteAddress1;
final Runnable task = () -> {
if (paused) {
LOG.debug("Message processing paused, not polling HTTP resource {}.", url);
return;
}
if (isThrottled()) {
// this transport won't block, but we can simply skip this iteration
LOG.debug("Not polling HTTP resource {} because we are throttled.", url);
return;
}
final Request.Builder requestBuilder = new Request.Builder().get()
.url(url)
.headers(Headers.of(headers));
try (final Response r = httpClient.newCall(requestBuilder.build()).execute()) {
if (!r.isSuccessful()) {
LOG.error("Expected successful HTTP status code [2xx], got " + r.code());
return;
}
input.processRawMessage(new RawMessage(r.body().bytes(), remoteAddress));
} catch (IOException e) {
LOG.error("Could not fetch HTTP resource at " + url, e);
}
};
scheduledFuture = scheduler.scheduleAtFixedRate(task, 0,
configuration.getInt(CK_INTERVAL),
TimeUnit.valueOf(configuration.getString(CK_TIMEUNIT)));
}
@Override
public void doStop() {
serverEventBus.unregister(this);
if (scheduledFuture != null) {
scheduledFuture.cancel(true);
}
}
@Override
public MetricSet getMetricSet() {
// TODO do we need any metrics here?
return null;
}
@FactoryClass
public interface Factory extends Transport.Factory {
@Override
HttpPollTransport create(Configuration configuration);
@Override
Config getConfig();
}
@ConfigClass
public static class Config extends ThrottleableTransport.Config {
@Override
public ConfigurationRequest getRequestedConfiguration() {
final ConfigurationRequest r = super.getRequestedConfiguration();
r.addField(new TextField(
CK_URL,
"URI of JSON resource",
"http://example.org/api",
"HTTP resource returning JSON on GET",
ConfigurationField.Optional.NOT_OPTIONAL
));
r.addField(new TextField(
CK_HEADERS,
"Additional HTTP headers",
"",
"Add a comma separated list of additional HTTP headers. For example: Accept: application/json, X-Requester: Graylog",
ConfigurationField.Optional.OPTIONAL
));
r.addField(new NumberField(
CK_INTERVAL,
"Interval",
1,
"Time between every collector run. Select a time unit in the corresponding dropdown. Example: Run every 5 minutes.",
ConfigurationField.Optional.NOT_OPTIONAL
));
r.addField(new DropdownField(
CK_TIMEUNIT,
"Interval time unit",
TimeUnit.MINUTES.toString(),
DropdownField.ValueTemplates.timeUnits(),
ConfigurationField.Optional.NOT_OPTIONAL
));
return r;
}
}
}
