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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 com.yahoo.concurrent.DaemonThreadFactory;
import com.yahoo.net.HostName;
import com.yahoo.security.tls.MixedMode;
import com.yahoo.security.tls.TlsContext;
import com.yahoo.security.tls.TransportSecurityUtils;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import static com.yahoo.vespa.config.server.monitoring.Metrics.getMetricName;
public class ZKMetricUpdater implements Runnable {
private static final Logger log = Logger.getLogger(ZKMetricUpdater.class.getName());
public static final String METRIC_ZK_ZNODES = getMetricName("zkZNodes");
public static final String METRIC_ZK_LATENCY_AVERAGE = getMetricName("zkAvgLatency");
public static final String METRIC_ZK_LATENCY_MAX = getMetricName("zkMaxLatency");
public static final String METRIC_ZK_CONNECTIONS = getMetricName("zkConnections");
public static final String METRIC_ZK_OUTSTANDING_REQUESTS = getMetricName("zkOutstandingRequests");
private static final int CONNECTION_TIMEOUT_MS = 1000;
private static final int READ_TIMEOUT_MS = 1000;
private final AtomicReference<Map<String, Long>> zkMetrics = new AtomicReference<>(new HashMap<>());
private final ScheduledExecutorService executorService;
private final int zkPort;
public ZKMetricUpdater(ZookeeperServerConfig zkServerConfig, long delayMS, long intervalMS) {
this.zkPort = zkServerConfig.clientPort();
if (intervalMS <= 0 ) throw new IllegalArgumentException("interval must be positive, was " + intervalMS + " ms");
this.executorService = new ScheduledThreadPoolExecutor(1, new DaemonThreadFactory("zkmetricupdater"));
this.executorService.scheduleAtFixedRate(this, delayMS, intervalMS, TimeUnit.MILLISECONDS);
}
private void setMetricAttribute(String attribute, long value, Map<String, Long> data) {
switch (attribute) {
case "zk_znode_count":
data.put(METRIC_ZK_ZNODES, value);
break;
case "zk_avg_latency":
data.put(METRIC_ZK_LATENCY_AVERAGE, value);
break;
case "zk_max_latency":
data.put(METRIC_ZK_LATENCY_MAX, value);
break;
case "zk_num_alive_connections":
data.put(METRIC_ZK_CONNECTIONS, value);
break;
case "zk_outstanding_requests":
data.put(METRIC_ZK_OUTSTANDING_REQUESTS, value);
break;
}
}
@Override
public void run() {
Optional<String> report = retrieveReport();
report.ifPresent(this::parseReport);
}
public void shutdown() {
executorService.shutdown();
}
private Optional<String> retrieveReport() {
try {
Socket socket = null;
InputStream in = null;
OutputStream out = null;
try {
socket = createSocket();
socket.setSoTimeout(READ_TIMEOUT_MS);
socket.connect(new InetSocketAddress(HostName.getLocalhost(), zkPort), CONNECTION_TIMEOUT_MS);
in = socket.getInputStream();
out = socket.getOutputStream();
out.write("mntr\n".getBytes(StandardCharsets.UTF_8));
out.flush();
return Optional.of(new String(in.readAllBytes(), StandardCharsets.UTF_8));
} finally {
if (in != null) in.close();
if (out != null) out.close();
if (socket != null && socket.isConnected()) socket.close();
}
} catch (Exception e) {
log.warning("Failure in retrieving monitoring data: (" + e.getClass().getSimpleName() + ") " + e.getMessage());
log.log(Level.FINE, e, e::toString);
return Optional.empty();
}
}
private static Socket createSocket() throws IOException {
TlsContext tlsContext = TransportSecurityUtils.getSystemTlsContext().orElse(null);
if (tlsContext == null || TransportSecurityUtils.getInsecureMixedMode() == MixedMode.PLAINTEXT_CLIENT_MIXED_SERVER) {
return new Socket();
}
return tlsContext.context().getSocketFactory().createSocket();
}
private static final Pattern MONITORING_REPORT = Pattern.compile("^(\\w+)\\s+(\\d+)$", Pattern.MULTILINE);
private void parseReport(String report) {
Matcher matcher = MONITORING_REPORT.matcher(report);
Map<String, Long> data = new HashMap<>();
while (matcher.find()) {
String attribute = matcher.group(1);
long value = Long.parseLong(matcher.group(2));
setMetricAttribute(attribute, value, data);
}
zkMetrics.set(data);
}
public Map<String, Long> getZKMetrics() {
return zkMetrics.get();
}
}
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