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package parser
import (
"context"
"encoding/csv"
"fmt"
"io"
"strconv"
"strings"
"time"
"epimetheus/internal/metrics"
)
// CSVParser parses metrics from CSV format
type CSVParser struct{}
// NewCSVParser creates a new CSV parser
func NewCSVParser() *CSVParser {
return &CSVParser{}
}
// Parse reads metrics from CSV format
// Format: metric_name,label1=value1;label2=value2,value,timestamp_ms
func (p *CSVParser) Parse(ctx context.Context, reader io.Reader) ([]metrics.Sample, error) {
var samples []metrics.Sample
csvReader := csv.NewReader(reader)
csvReader.Comment = '#'
lineNum := 0
for {
select {
case <-ctx.Done():
return nil, ctx.Err()
default:
}
record, err := csvReader.Read()
if err == io.EOF {
break
}
if err != nil {
return nil, fmt.Errorf("line %d: %w", lineNum, err)
}
lineNum++
if len(record) < 3 {
continue // Skip invalid records
}
sample, err := p.parseRecord(record, lineNum)
if err != nil {
continue // Skip records with errors
}
samples = append(samples, sample)
}
return samples, nil
}
func (p *CSVParser) parseRecord(record []string, lineNum int) (metrics.Sample, error) {
metricName := strings.TrimSpace(record[0])
if metricName == "" {
return metrics.Sample{}, fmt.Errorf("empty metric name")
}
labels := parseLabels(record[1])
value, err := strconv.ParseFloat(strings.TrimSpace(record[2]), 64)
if err != nil {
return metrics.Sample{}, fmt.Errorf("invalid value: %w", err)
}
timestamp := time.Now()
if len(record) > 3 && record[3] != "" {
timestampMs, err := strconv.ParseInt(strings.TrimSpace(record[3]), 10, 64)
if err == nil {
timestamp = time.UnixMilli(timestampMs)
}
}
return metrics.NewSample(metricName, labels, value, timestamp), nil
}
func parseLabels(labelStr string) map[string]string {
labels := make(map[string]string)
if labelStr == "" {
return labels
}
labelPairs := strings.Split(labelStr, ";")
for _, pair := range labelPairs {
parts := strings.SplitN(pair, "=", 2)
if len(parts) == 2 {
labels[strings.TrimSpace(parts[0])] = strings.TrimSpace(parts[1])
}
}
return labels
}
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