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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.config.server.monitoring;
import com.yahoo.cloud.config.ZookeeperServerConfig;
import org.junit.After;
import org.junit.Test;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.charset.StandardCharsets;
import java.util.Map;
import java.util.concurrent.Executors;
import java.util.function.Supplier;
import java.util.logging.Logger;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.equalTo;
public class ZKMetricUpdaterTest {
private static final Logger LOG = Logger.getLogger(ZKMetricUpdaterTest.class.getName());
private Thread serverThread;
private int serverPort;
@After
public void terminate() throws InterruptedException {
if (serverThread != null) {
serverThread.interrupt();
serverThread.join(500);
}
}
@Test
public void zk_monitoring_data_is_parsed_and_reported() throws IOException {
setupTcpServer(() -> "zk_version\t3.4.0\n" + //
"zk_avg_latency\t444\n" + //
"zk_max_latency\t1234\n" + //
"zk_min_latency\t0\n" + //
"zk_packets_received\t71\n" + //
"zk_packets_sent\t70\n" + //
"zk_outstanding_requests\t12\n" + //
"zk_num_alive_connections\t2\n" + //
"zk_server_state\tleader\n" + //
"zk_znode_count\t4\n" + //
"zk_watch_count\t0\n" + //
"zk_ephemerals_count\t0\n" + //
"zk_approximate_data_size\t27\n");
ZKMetricUpdater updater = buildUpdater();
updater.run();
Map<String, Long> reportedMetrics = updater.getZKMetrics();
assertThat(reportedMetrics.get(ZKMetricUpdater.METRIC_ZK_CONNECTIONS), equalTo(2L));
assertThat(reportedMetrics.get(ZKMetricUpdater.METRIC_ZK_LATENCY_AVERAGE), equalTo(444L));
assertThat(reportedMetrics.get(ZKMetricUpdater.METRIC_ZK_LATENCY_MAX), equalTo(1234L));
assertThat(reportedMetrics.get(ZKMetricUpdater.METRIC_ZK_OUTSTANDING_REQUESTS), equalTo(12L));
assertThat(reportedMetrics.get(ZKMetricUpdater.METRIC_ZK_ZNODES), equalTo(4L));
updater.shutdown();
}
private ZKMetricUpdater buildUpdater() {
ZookeeperServerConfig zkServerConfig = new ZookeeperServerConfig(
new ZookeeperServerConfig.Builder().clientPort(serverPort).myid(12345));
return new ZKMetricUpdater(zkServerConfig, 0, 100000);
}
private void setupTcpServer(Supplier<String> reportProvider) throws IOException {
ServerSocket serverSocket = new ServerSocket(0);
serverPort = serverSocket.getLocalPort();
serverThread = Executors.defaultThreadFactory().newThread(() -> {
while (!Thread.interrupted()) {
try (Socket connection = serverSocket.accept()) {
BufferedReader input = new BufferedReader(new InputStreamReader(connection.getInputStream()));
String verb = input.readLine();
if ("mntr".equals(verb)) {
DataOutputStream output = new DataOutputStream(connection.getOutputStream());
output.write(reportProvider.get().getBytes(StandardCharsets.UTF_8));
output.close();
}
} catch (IOException e) {
LOG.severe("Error in fake ZK server: " + e.toString());
}
}
try {
serverSocket.close();
} catch (IOException e) {
LOG.severe("Error closing server socket in fake ZK server: " + e.toString());
}
});
serverThread.start();
}
}
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