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main
apps/dashvalidator/pkg/validator/prometheus/parser.go
49 строк
1 KB
ismail simsek
Chore: Bump promlib v0.0.11 (#123736)
30 апр 2026, 18:30
Не верифицирован
30 апр 2026, 18:30
3aafdaa
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package prometheus import ( "fmt" "github.com/prometheus/prometheus/promql/parser" ) // Parser extracts metric names from PromQL queries type Parser struct{} // NewParser creates a new PromQL parser func NewParser() *Parser { return &Parser{} } // ExtractMetrics parses a PromQL query and extracts all metric names // For example: "rate(http_requests_total[5m])" returns ["http_requests_total"] func (p *Parser) ExtractMetrics(query string) ([]string, error) { // Parse the PromQL expression expr, err := parser.NewParser(parser.Options{}).ParseExpr(query) if err != nil { return nil, fmt.Errorf("failed to parse PromQL query: %w", err) } // Extract metric names by walking the AST metrics := make(map[string]bool) // Use map to deduplicate parser.Inspect(expr, func(node parser.Node, _ []parser.Node) error { // VectorSelector represents a metric selector like "up" or "up{job="foo"}" if vs, ok := node.(*parser.VectorSelector); ok { metrics[vs.Name] = true } // MatrixSelector represents range queries like "up[5m]" if ms, ok := node.(*parser.MatrixSelector); ok { if vs, ok := ms.VectorSelector.(*parser.VectorSelector); ok { metrics[vs.Name] = true } } return nil }) // Convert map to slice result := make([]string, 0, len(metrics)) for metric := range metrics { result = append(result, metric) } return result, nil }