From 3fd46f3977fb650974e5e936cba362c787c00637 Mon Sep 17 00:00:00 2001
From: Paul Buetow <paul@buetow.org>
Date: Sat, 7 Feb 2026 16:32:10 +0200
Subject: reimport this PoC

---
 internal/parser/parser.go | 56 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 internal/parser/parser.go

(limited to 'internal/parser/parser.go')

diff --git a/internal/parser/parser.go b/internal/parser/parser.go
new file mode 100644
index 0000000..860baa3
--- /dev/null
+++ b/internal/parser/parser.go
@@ -0,0 +1,56 @@
+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
+}
-- 
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