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#pragma once
#include <util/generic/strbuf.h>
namespace NMonitoring {
namespace NPrometheus {
//
// Prometheus specific names and validation rules.
//
// See https://github.com/prometheus/docs/blob/master/content/docs/instrumenting/exposition_formats.md
// and https://github.com/prometheus/common/blob/master/expfmt/text_parse.go
//
inline constexpr TStringBuf BUCKET_SUFFIX = "_bucket";
inline constexpr TStringBuf COUNT_SUFFIX = "_count";
inline constexpr TStringBuf SUM_SUFFIX = "_sum";
inline constexpr TStringBuf MIN_SUFFIX = "_min";
inline constexpr TStringBuf MAX_SUFFIX = "_max";
inline constexpr TStringBuf LAST_SUFFIX = "_last";
// Used for the label that defines the upper bound of a bucket of a
// histogram ("le" -> "less or equal").
inline constexpr TStringBuf BUCKET_LABEL = "le";
inline bool IsValidLabelNameStart(char ch) {
return (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') || ch == '_';
}
inline bool IsValidLabelNameContinuation(char ch) {
return IsValidLabelNameStart(ch) || (ch >= '0' && ch <= '9');
}
inline bool IsValidMetricNameStart(char ch) {
return IsValidLabelNameStart(ch) || ch == ':';
}
inline bool IsValidMetricNameContinuation(char ch) {
return IsValidLabelNameContinuation(ch) || ch == ':';
}
inline bool IsSum(TStringBuf name) {
return name.EndsWith(SUM_SUFFIX);
}
inline bool IsCount(TStringBuf name) {
return name.EndsWith(COUNT_SUFFIX);
}
inline bool IsBucket(TStringBuf name) {
return name.EndsWith(BUCKET_SUFFIX);
}
inline TStringBuf ToBaseName(TStringBuf name) {
if (IsBucket(name)) {
return name.SubString(0, name.length() - BUCKET_SUFFIX.length());
}
if (IsCount(name)) {
return name.SubString(0, name.length() - COUNT_SUFFIX.length());
}
if (IsSum(name)) {
return name.SubString(0, name.length() - SUM_SUFFIX.length());
}
return name;
}
} // namespace NPrometheus
} // namespace NMonitoring
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