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|
package parser
import (
"context"
"fmt"
"io"
"os"
"epimetheus/internal/metrics"
)
// Parser defines the interface for metric parsers.
type Parser interface {
Parse(ctx context.Context, reader io.Reader) ([]metrics.Sample, error)
}
// ParseFile parses metrics from a file.
func ParseFile(ctx context.Context, filename, format string) ([]metrics.Sample, error) {
file, err := os.Open(filename)
if err != nil {
return nil, fmt.Errorf("failed to open file: %w", err)
}
defer file.Close()
return parseWithFormat(ctx, file, format)
}
// ParseStdin parses metrics from standard input.
func ParseStdin(ctx context.Context, format string) ([]metrics.Sample, error) {
return parseWithFormat(ctx, os.Stdin, format)
}
// parseWithFormat parses metrics using the specified format.
func parseWithFormat(ctx context.Context, reader io.Reader, format string) ([]metrics.Sample, error) {
var parser Parser
switch format {
case "csv":
parser = NewCSVParser()
case "json":
parser = NewJSONParser()
default:
return nil, fmt.Errorf("unsupported format: %s (use csv or json)", format)
}
samples, err := parser.Parse(ctx, reader)
if err != nil {
return nil, fmt.Errorf("failed to parse metrics: %w", err)
}
if len(samples) == 0 {
return nil, fmt.Errorf("no valid samples found")
}
return samples, nil
}
|
