Release prep: 54 engines, self-hosted signatures, i18n, dashboard updates

internal/infrastructure/logging/logger.go

@@ -0,0 +1,57 @@
+// Package logging provides structured logging via Go's log/slog.
+// Production: JSON output. Development: text output with colors.
+//
+// Usage:
+//
+//	logger := logging.New("json", "info")  // production
+//	logger := logging.New("text", "debug") // development
+//	logger.Info("event ingested", "event_id", id, "source", src)
+package logging
+
+import (
+	"io"
+	"log/slog"
+	"os"
+	"strings"
+)
+
+// New creates a structured logger.
+// format: "json" (production) or "text" (development).
+// level: "debug", "info", "warn", "error".
+func New(format, level string) *slog.Logger {
+	return NewWithOutput(format, level, os.Stdout)
+}
+
+// NewWithOutput creates a logger writing to the given writer.
+func NewWithOutput(format, level string, w io.Writer) *slog.Logger {
+	lvl := parseLevel(level)
+	opts := &slog.HandlerOptions{Level: lvl}
+
+	var handler slog.Handler
+	switch strings.ToLower(format) {
+	case "json":
+		handler = slog.NewJSONHandler(w, opts)
+	default:
+		handler = slog.NewTextHandler(w, opts)
+	}
+
+	return slog.New(handler)
+}
+
+// WithComponent returns a logger with a "component" attribute.
+func WithComponent(logger *slog.Logger, component string) *slog.Logger {
+	return logger.With("component", component)
+}
+
+func parseLevel(s string) slog.Level {
+	switch strings.ToLower(s) {
+	case "debug":
+		return slog.LevelDebug
+	case "warn", "warning":
+		return slog.LevelWarn
+	case "error":
+		return slog.LevelError
+	default:
+		return slog.LevelInfo
+	}
+}