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add an online parser for prometheus. #2851

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add an online parser for prometheus. #2851

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3de27a6
add an online parser for prometheus, which replaces org.apache.hertzb…
leo-934 Dec 1, 2024
481e3f4
add an online parser for prometheus, which replaces org.apache.hertzb…
leo-934 Dec 1, 2024
4eef317
add an online parser for prometheus, which replaces org.apache.hertzb…
leo-934 Dec 1, 2024
30d0d8a
add an online parser for prometheus, which replaces org.apache.hertzb…
leo-934 Dec 1, 2024
19341a2
add an online parser for prometheus, which replaces org.apache.hertzb…
leo-934 Dec 1, 2024
e39e780
add an online parser for prometheus, which replaces org.apache.hertzb…
leo-934 Dec 1, 2024
f71b725
add an online parser for prometheus, which replaces org.apache.hertzb…
leo-934 Dec 1, 2024
d9c7046
add an online parser for prometheus, which replaces org.apache.hertzb…
leo-934 Dec 1, 2024
33966b3
add an online parser for prometheus, which replaces org.apache.hertzb…
leo-934 Dec 1, 2024
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Merge branch 'master' into online-prometheus-parser
leo-934 Dec 27, 2024
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329 changes: 329 additions & 0 deletions .../src/main/java/org/apache/hertzbeat/collector/collect/prometheus/parser/OnlineParser.java
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.hertzbeat.collector.collect.prometheus.parser;

import lombok.extern.slf4j.Slf4j;

import java.io.IOException;
import java.io.InputStream;
import java.math.BigDecimal;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;


/**
* Resolves the data passed by prometheus's exporter interface http:xxx/metrics
*/
@Slf4j
public class OnlineParser {

private static class FormatException extends Exception {
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replace to a individual class， don't use exception as a inner class


public FormatException() {}

public FormatException(String message) {
super(message);
}
}

private static class CharChecker {
int i;
boolean satisfied;

CharChecker(int i) {
this.i = i;
this.satisfied = false;
}

private CharChecker maybeLeftBracket() {
if (i == '{') {
satisfied = true;
}
return this;
}

private CharChecker maybeRightBracket() {
if (i == '}') {
satisfied = true;
}
return this;
}

private CharChecker maybeEqualsSign() {
if (i == '=') {
satisfied = true;
}
return this;
}

private CharChecker maybeQuotationMark() {
if (i == '"') {
satisfied = true;
}
return this;
}

private CharChecker maybeSpace() {
if (i == ' ') {
satisfied = true;
}
return this;
}

private CharChecker maybeComma() {
if (i == ',') {
satisfied = true;
}
return this;
}

private CharChecker maybeEof() {
if (i == -1) {
satisfied = true;
}
return this;
}

private CharChecker maybeEol() {
if (i == '\n') {
satisfied = true;
}
return this;
}

private int noElse() throws FormatException {
if (!satisfied) {
throw new FormatException();
}
return this.i;
}

private int getInt() throws FormatException {
return this.i;
}

}

private static CharChecker parseOneChar(InputStream inputStream) throws IOException {
int i = inputStream.read();
return new CharChecker(i);
}

private static CharChecker parseOneDouble(InputStream inputStream, StringBuilder stringBuilder) throws IOException {
int i = inputStream.read();
while ((i >= '0' && i <= '9') || (i >= 'a' && i <= 'z') || (i >= 'A' && i <= 'Z') || i == '-' || i == ' ' || i == 'e' || i == '.') {
stringBuilder.append((char) i);
i = inputStream.read();
}
return new CharChecker(i);
}

private static CharChecker skipOneLong(InputStream inputStream) throws IOException {
int i = inputStream.read();
while (i >= '0' && i <= '9') {
i = inputStream.read();
}
return new CharChecker(i);
}

private static CharChecker parseMetricName(InputStream inputStream, StringBuilder stringBuilder) throws IOException {
int i = inputStream.read();
while ((i >= 'a' && i <= 'z') || (i >= 'A' && i <= 'Z') || (i >= '0' && i <= '9') || i == '_' || i == ':') {
stringBuilder.append((char) i);
i = inputStream.read();
}
return new CharChecker(i);
}

private static CharChecker parseLabelName(InputStream inputStream, StringBuilder stringBuilder) throws IOException {
int i = inputStream.read();
while ((i >= 'a' && i <= 'z') || (i >= 'A' && i <= 'Z') || (i >= '0' && i <= '9') || i == '_') {
stringBuilder.append((char) i);
i = inputStream.read();
}
return new CharChecker(i);
}

private static CharChecker parseLabelValue(InputStream inputStream, StringBuilder stringBuilder) throws IOException, FormatException {
int i = inputStream.read();
while (i != '"' && i != -1) {
if (i == '\\') {
i = inputStream.read();
switch (i) {
case 'n':
stringBuilder.append('\n');
break;
case '\\':
stringBuilder.append('\\');
break;
case '\"':
stringBuilder.append('\"');
break;
default:
throw new FormatException();
}
}
else {
stringBuilder.append((char) i);
}
i = inputStream.read();
}
return new CharChecker(i);
}

private static CharChecker skipSpaces(InputStream inputStream) throws IOException {
int i = inputStream.read();
while (i == ' ') {
i = inputStream.read();
}
return new CharChecker(i);
}

private static CharChecker skipToLineEnd(InputStream inputStream) throws IOException {
int i = inputStream.read();
while (i != '\n' && i != -1) {
i = inputStream.read();
}
return new CharChecker(i);
}

private static Double toDouble(String string) throws FormatException {
switch (string) {
case " Inf":
return Double.POSITIVE_INFINITY;
case "-Inf":
return Double.NEGATIVE_INFINITY;
case "NaN":
return Double.NaN;
default:
try {
BigDecimal bigDecimal = new BigDecimal(string);
return bigDecimal.doubleValue();
} catch (NumberFormatException e) {
throw new FormatException();
}
}
}

private static CharChecker parseLabels(InputStream inputStream, StringBuilder stringBuilder, List<MetricFamily.Label> labelList) throws IOException, FormatException {
int i;
while (true) {
MetricFamily.Label label = new MetricFamily.Label();
i = skipSpaces(inputStream).getInt();
stringBuilder.append((char) i);
i = parseLabelName(inputStream, stringBuilder).maybeSpace().maybeEqualsSign().noElse();
label.setName(stringBuilder.toString());
stringBuilder.delete(0, stringBuilder.length());
if (i == ' ') {
skipSpaces(inputStream).maybeEqualsSign().noElse();
}

skipSpaces(inputStream).maybeQuotationMark().noElse();
parseLabelValue(inputStream, stringBuilder).maybeQuotationMark().noElse();
String labelValue = stringBuilder.toString();
if (!labelValue.equals(new String(labelValue.getBytes(StandardCharsets.UTF_8)))) {
throw new FormatException();
}
label.setValue(labelValue);
stringBuilder.delete(0, stringBuilder.length());

i = skipSpaces(inputStream).maybeSpace().maybeComma().maybeRightBracket().noElse();
labelList.add(label);
if (i == '}') {
break;
}
}
return new CharChecker(i);
}

private static CharChecker parseMetric(InputStream inputStream, Map<String, MetricFamily> metricFamilyMap, StringBuilder stringBuilder) throws IOException, FormatException {
MetricFamily metricFamily = null;
MetricFamily.Metric metric = new MetricFamily.Metric();
int i = parseMetricName(inputStream, stringBuilder).maybeSpace().maybeLeftBracket().noElse();
String metricName = stringBuilder.toString();
stringBuilder.delete(0, stringBuilder.length());

if (!metricFamilyMap.containsKey(metricName)) {
metricFamily = new MetricFamily();
metricFamily.setMetricList(new ArrayList<>());
metricFamily.setName(metricName);
metricFamilyMap.put(metricName, metricFamily);
}
else {
metricFamily = metricFamilyMap.get(metricName);
}

if (i == ' ') {
i = skipSpaces(inputStream).getInt();
}
if (i == '{') {
List<MetricFamily.Label> labelList = new LinkedList<>();
parseLabels(inputStream, stringBuilder, labelList);
metric.setLabels(labelList);
i = skipSpaces(inputStream).getInt();
}

stringBuilder.delete(0, stringBuilder.length());
stringBuilder.append((char) i);
i = parseOneDouble(inputStream, stringBuilder).maybeSpace().maybeEol().maybeEof().noElse();
metric.setValue(toDouble(stringBuilder.toString()));
if (i == '\n' || i == -1) {
metricFamily.getMetricList().add(metric);
return new CharChecker(i);
}

i = skipSpaces(inputStream).getInt();
stringBuilder.delete(0, stringBuilder.length());
stringBuilder.append((char) i);
i = skipOneLong(inputStream).maybeSpace().maybeEol().maybeEof().noElse();
if (i == '\n' || i == -1) {
metricFamily.getMetricList().add(metric);
return new CharChecker(i);
}
i = skipSpaces(inputStream).maybeEol().maybeEof().noElse();

metricFamily.getMetricList().add(metric);
return new CharChecker(i);
}

public static Map<String, MetricFamily> parseMetrics(InputStream inputStream) throws IOException {
Map<String, MetricFamily> metricFamilyMap = new ConcurrentHashMap<>(10);
int i = inputStream.read();
try {
while (i != -1) {
if (i == '#' || i == '\n') {
skipToLineEnd(inputStream).maybeEol().maybeEof().noElse();
} else {
StringBuilder stringBuilder = new StringBuilder();
stringBuilder.append((char) i);
parseMetric(inputStream, metricFamilyMap, stringBuilder);
}
i = inputStream.read();
}
} catch (FormatException e) {
log.error("prometheus parser failed because of wrong input format. {}", e.getMessage());
return null;
}
return metricFamilyMap;
}

}
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