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// Copyright (C) 2018 The Android Open Source Project
//
// Licensed 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 com.google.gerrit.elasticsearch;
import com.google.common.flogger.FluentLogger;
import com.google.gerrit.extensions.events.LifecycleListener;
import com.google.gerrit.lifecycle.LifecycleModule;
import com.google.gson.JsonParser;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.Singleton;
import java.io.IOException;
import org.apache.http.HttpStatus;
import org.apache.http.StatusLine;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.CredentialsProvider;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.apache.http.impl.nio.client.HttpAsyncClientBuilder;
import org.elasticsearch.client.Request;
import org.elasticsearch.client.Response;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;
@Singleton
class ElasticRestClientProvider implements Provider<RestClient>, LifecycleListener {
private static final FluentLogger logger = FluentLogger.forEnclosingClass();
private final ElasticConfiguration cfg;
private volatile RestClient client;
private ElasticQueryAdapter adapter;
@Inject
ElasticRestClientProvider(ElasticConfiguration cfg) {
this.cfg = cfg;
}
public static LifecycleModule module() {
return new LifecycleModule() {
@Override
protected void configure() {
listener().to(ElasticRestClientProvider.class);
}
};
}
@Override
public RestClient get() {
if (client == null) {
synchronized (this) {
if (client == null) {
client = build();
ElasticVersion version = getVersion();
logger.atInfo().log("Elasticsearch integration version %s", version);
adapter = new ElasticQueryAdapter();
}
}
}
return client;
}
@Override
public void start() {}
@Override
public void stop() {
if (client != null) {
try {
client.close();
} catch (IOException e) {
// Ignore. We can't do anything about it.
}
}
}
ElasticQueryAdapter adapter() {
get(); // Make sure we're connected
return adapter;
}
public static class FailedToGetVersion extends ElasticException {
private static final long serialVersionUID = 1L;
private static final String MESSAGE = "Failed to get Elasticsearch version";
FailedToGetVersion(StatusLine status) {
super(String.format("%s: %d %s", MESSAGE, status.getStatusCode(), status.getReasonPhrase()));
}
FailedToGetVersion(Throwable cause) {
super(MESSAGE, cause);
}
}
private ElasticVersion getVersion() throws ElasticException {
try {
Response response = client.performRequest(new Request("GET", "/"));
StatusLine statusLine = response.getStatusLine();
if (statusLine.getStatusCode() != HttpStatus.SC_OK) {
throw new FailedToGetVersion(statusLine);
}
String version =
new JsonParser()
.parse(AbstractElasticIndex.getContent(response))
.getAsJsonObject()
.get("version")
.getAsJsonObject()
.get("number")
.getAsString();
logger.atInfo().log("Connected to Elasticsearch version %s", version);
return ElasticVersion.forVersion(version);
} catch (IOException e) {
throw new FailedToGetVersion(e);
}
}
private RestClient build() {
RestClientBuilder builder = RestClient.builder(cfg.getHosts());
setConfiguredCredentialsIfAny(builder);
return builder.build();
}
private void setConfiguredCredentialsIfAny(RestClientBuilder builder) {
String username = cfg.username;
String password = cfg.password;
if (username != null && password != null) {
CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
credentialsProvider.setCredentials(
AuthScope.ANY, new UsernamePasswordCredentials(username, password));
builder.setHttpClientConfigCallback(
(HttpAsyncClientBuilder httpClientBuilder) ->
httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider));
}
}
}
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