Many resources are needed to download a project. Please understand that we have to compensate our server costs. Thank you in advance. Project price only 1 $
You can buy this project and download/modify it how often you want.
package com.alibaba.metrics.os.linux;
import com.alibaba.metrics.CachedMetricSet;
import com.alibaba.metrics.Clock;
import com.alibaba.metrics.Metric;
import com.alibaba.metrics.MetricName;
import com.alibaba.metrics.PersistentGauge;
import com.alibaba.metrics.os.utils.FileUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;
public class TcpGaugeSet extends CachedMetricSet {
private static final Logger logger = LoggerFactory.getLogger(SystemMemoryGaugeSet.class);
private static final String DEFAULT_FILE_PATH = "/proc/net/snmp";
/**
* Note that all the metrics are counters, EXCEPT for tcp.curr_estab
* see more: http://perthcharles.github.io/2015/11/09/wiki-rfc2012-snmp-proc/
*/
private static final String[] METRICS = {
"tcp.active_opens", // active opening connections
"tcp.passive_opens", // passive opening connections
"tcp.attempt_fails", // number of failed connection attempts
"tcp.estab_resets", // number of resets that have occurred at ESTABLISHED
"tcp.in_segs", // incoming segments
"tcp.out_segs", // outgoing segments
"tcp.retran_segs", // number of retran segements
"tcp.in_errs", // incoming segments with errs, e.g. checksum error
"tcp.out_rsts", // outgoing segments with resets
};
/**
* Number of connections that is in ESTABLISHED state, which is a gauge value
*/
private static final String CURRENT_ESTAB = "tcp.current_estab";
/**
* The ratio of retran segments and outgoing segments
*/
private static final String RETRAN_RATIO = "tcp.retran_ratio";
private static final String SPACE_REGEX = "\\s+";
private String filePath;
/**
* The counters of the metrics
*/
private long[] counters;
/**
* The rate of the counters, e.g. active open connections per seconds
*/
private double[] rates;
/**
* The number of tcp connections that is in established state.
* Note that this data is not a counter
*/
private long currentEstab;
/**
* retranRatio = (RetransSegs－last RetransSegs) ／ (OutSegs－last OutSegs)
*/
private double retranRatio;
/**
* Whether it is the first collection or not, if true, rate will be calculated as 0.
*/
private boolean firstCollection;
private Map gauges;
public TcpGaugeSet() {
this(DEFAULT_FILE_PATH, DEFAULT_DATA_TTL, TimeUnit.MILLISECONDS, Clock.defaultClock());
}
public TcpGaugeSet(String filePath) {
this(filePath, DEFAULT_DATA_TTL, TimeUnit.MILLISECONDS, Clock.defaultClock());
}
public TcpGaugeSet(long dataTTL, TimeUnit unit) {
this(DEFAULT_FILE_PATH, dataTTL, unit, Clock.defaultClock());
}
public TcpGaugeSet(String filePath, long dataTTL, TimeUnit unit, Clock clock) {
super(dataTTL, unit, clock);
this.filePath = filePath;
this.counters = new long[METRICS.length];
this.rates = new double[METRICS.length];
this.gauges = new HashMap();
this.firstCollection = true;
populateGauges();
}
/**
* Basically, we are seeking the second line and want to filter the first line:
* Tcp: RtoAlgorithm RtoMin RtoMax MaxConn ActiveOpens PassiveOpens AttemptFails EstabResets CurrEstab InSegs OutSegs RetransSegs InErrs OutRsts
* Tcp: 1 200 120000 -1 6463920 8949291 793366 541849 10 6107706493 3268075709 24668021 1 4964874
* see https://tools.ietf.org/html/rfc2012 section 2
* The first part after 'Tcp:' (tcpRtoAlgorithm), have only valid values of 1,2,3,4
*/
@Override
protected void getValueInternal() {
try {
List lines = FileUtils.readFileAsStringArray(filePath);
for (String line: lines) {
if (line.startsWith("Tcp:")) {
String[] tokens = line.split(SPACE_REGEX);
if (Character.isDigit(tokens[1].charAt(0))) {
// parse counters
long[] counts = {
Long.parseLong(tokens[5]), // tcp.active_opens
Long.parseLong(tokens[6]), // tcp.passive_opens
Long.parseLong(tokens[7]), // tcp.attempt_fails
Long.parseLong(tokens[8]), // tcp.estab_resets
Long.parseLong(tokens[10]), // tcp.in_segs
Long.parseLong(tokens[11]), // tcp.out_segs
Long.parseLong(tokens[12]), // tcp.retran_segs
Long.parseLong(tokens[13]), // tcp.in_errs
Long.parseLong(tokens[14]), // tcp.out_rsts
};
if (!firstCollection) {
// calculate deltas
long[] deltas = new long[counters.length];
for (int i = 0; i < counters.length; i++) {
deltas[i] = counts[i] - counters[i];
}
// calculate rates
long duration = clock.getTime() - lastCollectTime.get();
for (int i = 0; i < counters.length; i++) {
rates[i] = 1000.0d * deltas[i] / duration;
}
// calculate tcp retran rate
retranRatio = 1.0d * deltas[6] / deltas[5];
}
// store counters
System.arraycopy(counts, 0, counters, 0, counters.length);
// tcp.current_estab, which is not a counter
currentEstab = Long.parseLong(tokens[9]);
// mark first collection
if (firstCollection) {
firstCollection = false;
}
}
}
}
} catch (IOException e) {
logger.warn("Error during reading file {}", filePath, e);
}
}
@Override
public Map getMetrics() {
return gauges;
}
public void setFilePath(String filePath) {
this.filePath = filePath;
}
private void populateGauges() {
for (int i = 0; i < METRICS.length; i++) {
gauges.put(MetricName.build(METRICS[i]), new TcpGauge(i));
}
// add tcp.current_estab
gauges.put(MetricName.build(CURRENT_ESTAB), new PersistentGauge() {
@Override
public Long getValue() {
return currentEstab;
}
});
// add tcp.retran_ratio
gauges.put(MetricName.build(RETRAN_RATIO), new PersistentGauge() {
@Override
public Double getValue() {
return retranRatio;
}
});
}
private class TcpGauge extends PersistentGauge {
private int index;
public TcpGauge(int index) {
this.index = index;
}
@Override
public Double getValue() {
try {
refreshIfNecessary();
return rates[index];
} catch (Exception e) {
return 0.0d;
}
}
}
}
