Duansg commented on PR #3752:
URL: https://github.com/apache/hertzbeat/pull/3752#issuecomment-3262359409
> Problem description, for reference and to reproduce the issue
` item_create_total{app="item-microservi\"ce-center",value="agent"} 0.0`
```
private static CharChecker parseLabelValue(InputStream inputStream,
StringBuilder stringBuilder) throws IOException, FormatException {
int i = getChar(inputStream);
while (i != '"' && i != -1) {
if (i == '\\') {
i = getChar(inputStream);
switch (i) {
case 'n' -> stringBuilder.append('\n');
case '\\' -> stringBuilder.append('\\');
case '\"' -> stringBuilder.append('\"');
default -> {
// Unknown escape, keep as-is
//
https://github.com/VictoriaMetrics/VictoriaMetrics/blob/master/lib/protoparser/prometheus/parser.go#L419
stringBuilder.append('\\');
if (i != -1) {
stringBuilder.append((char) i);
}
}
}
} else {
stringBuilder.append((char) i);
}
i = getChar(inputStream);
}
return new CharChecker(i);
}
private static int getChar(InputStream inputStream) throws IOException,
FormatException {
int i = inputStream.read(); // read '\'
if (i == '\\') { // hit
i = inputStream.read(); // read
next '\''
if (escapeMap.containsKey(i)) { //
escapeMap hit
return escapeMap.get(i); // return
'\"' -> i , The lower-level condition
while (i
!= '"' && i != -1) exits the loop, causing the tag to be truncated.
} else {
throw new FormatException("Escape character failed.");
}
} else {
return i;
}
}
```
`item_create3_total{app1_="item-microservi\\ce-center",value="agent"} 0.0`
```
private static CharChecker parseLabelValue(InputStream inputStream,
StringBuilder stringBuilder) throws IOException, FormatException {
int i = getChar(inputStream);
while (i != '"' && i != -1) {
if (i == '\\') { // hit'\'
i = getChar(inputStream);
switch (i) {
case 'n' -> stringBuilder.append('\n');
case '\\' -> stringBuilder.append('\\');
case '\"' -> stringBuilder.append('\"');
default -> {
// Unknown escape, keep as-is
//
https://github.com/VictoriaMetrics/VictoriaMetrics/blob/master/lib/protoparser/prometheus/parser.go#L419
stringBuilder.append('\\');
if (i != -1) {
stringBuilder.append((char) i);
}
}
}
} else {
stringBuilder.append((char) i);
}
i = getChar(inputStream); // read
the first'\'
}
return new CharChecker(i);
}
private static int getChar(InputStream inputStream) throws IOException,
FormatException {
int i = inputStream.read(); // read the
second '\'
if (i == '\\') { // hit the
second'\'
i = inputStream.read(); // read 'c'
if (escapeMap.containsKey(i)) { //
escapeMap miss
return escapeMap.get(i);
} else { // throw
error
throw new FormatException("Escape character failed.");
}
} else {
return i;
}
}
```
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