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add an online parser for prometheus, which replaces org.apache.hertzb…
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…eat.collector.collect.prometheus.parser.TextParser.textToMetricFamilies
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@leo-934
leo-934 committed Dec 1, 2024
1 parent 1c6f40d commit e93e161
Showing 1 changed file with 55 additions and 36 deletions.
91 changes: 55 additions & 36 deletions .../src/main/java/org/apache/hertzbeat/collector/collect/prometheus/parser/OnlineParser.java
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Original file line number Diff line number Diff line change
Expand Up @@ -22,7 +22,9 @@
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;
Expand Down Expand Up @@ -118,7 +120,6 @@ private int noElse() throws FormatException {
private int getInt() throws FormatException {
return this.i;
}


}

Expand All @@ -127,19 +128,18 @@ private static CharChecker parseOneChar(InputStream inputStream) throws IOExcept
return new CharChecker(i);
}

private static CharChecker parseOneWord(InputStream inputStream, StringBuilder stringBuilder) throws IOException {
private static CharChecker parseOneDouble(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 == ':') {
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 parseOneDouble(InputStream inputStream, StringBuilder stringBuilder) throws IOException {
private static CharChecker skipOneLong(InputStream inputStream) 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);
while (i >= '0' && i <= '9') {
i = inputStream.read();
}
return new CharChecker(i);
Expand All @@ -163,18 +163,25 @@ private static CharChecker parseLabelName(InputStream inputStream, StringBuilder
return new CharChecker(i);
}

private static CharChecker parseLabelValue(InputStream inputStream, StringBuilder stringBuilder) throws IOException {
private static CharChecker parseLabelValue(InputStream inputStream, StringBuilder stringBuilder) throws IOException, FormatException {
int i = inputStream.read();
while (i != '"' && i != -1) {
stringBuilder.append((char) i);
i = inputStream.read();
}
return new CharChecker(i);
}

private static CharChecker skipOneWord(InputStream inputStream) throws IOException {
int i = inputStream.read();
while ((i >= 'a' && i <= 'z') || (i >= 'A' && i <= 'Z') || (i >= '0' && i <= '9') || i == '_' || i == ':') {
if (i == '\\') {
i = inputStream.read();
switch (i) {
case 'n':
stringBuilder.append('\n');
case '\\':
stringBuilder.append('\\');
case '\"':
stringBuilder.append('\"');
default:
throw new FormatException();
}
}
else {
stringBuilder.append((char) i);
}
i = inputStream.read();
}
return new CharChecker(i);
Expand Down Expand Up @@ -214,26 +221,31 @@ private static Double toDouble(String string) throws FormatException {
}
}



private static CharChecker skipCommentLine(InputStream inputStream) throws IOException, FormatException {
// skip space after '#'
int i = skipToLineEnd(inputStream).maybeEol().maybeEof().noElse();
return new CharChecker(i);
}

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();
parseLabelName(inputStream, stringBuilder).maybeEqualsSign().noElse();
i = skipSpaces(inputStream).getInt();
stringBuilder.append((char) i);
i = parseLabelName(inputStream, stringBuilder).maybeSpace().maybeEqualsSign().noElse();
label.setName(stringBuilder.toString());
stringBuilder.delete(0, stringBuilder.length());

parseOneChar(inputStream).maybeQuotationMark().noElse();
if (i == ' ') {
skipSpaces(inputStream).maybeEqualsSign().noElse();
}

i = parseOneChar(inputStream).maybeSpace().maybeQuotationMark().noElse();

if (i == ' ') {
skipSpaces(inputStream).maybeEqualsSign().noElse();
}
parseLabelValue(inputStream, stringBuilder).maybeQuotationMark().noElse();
label.setValue(stringBuilder.toString());
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 = parseOneChar(inputStream).maybeComma().maybeRightBracket().noElse();
Expand All @@ -252,7 +264,7 @@ private static CharChecker parseMetric(InputStream inputStream, Map<String, Metr
String metricName = stringBuilder.toString();
stringBuilder.delete(0, stringBuilder.length());

if (!metricFamilyMap.containsKey(stringBuilder.toString())) {
if (!metricFamilyMap.containsKey(metricName)) {
metricFamily = new MetricFamily();
metricFamily.setMetricList(new ArrayList<>());
metricFamily.setName(metricName);
Expand All @@ -262,26 +274,33 @@ private static CharChecker parseMetric(InputStream inputStream, Map<String, Metr
metricFamily = metricFamilyMap.get(metricName);
}

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

stringBuilder.delete(0, stringBuilder.length());
i = skipSpaces(inputStream).getInt();
stringBuilder.append((char) i);

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

i = skipSpaces(inputStream).getInt();
i = skipOneWord(inputStream).maybeSpace().maybeEol().maybeEof().noElse();
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);
Expand All @@ -293,8 +312,8 @@ public static Map<String, MetricFamily> parseMetrics(InputStream inputStream) th
int i = inputStream.read();
try {
while (i != -1) {
if (i == '#') {
skipCommentLine(inputStream);
if (i == '#' || i == '\n') {
skipToLineEnd(inputStream).maybeEol().maybeEof().noElse();
} else {
StringBuilder stringBuilder = new StringBuilder();
stringBuilder.append((char) i);
Expand Down

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