feat: implement core daemon (config, fire client, scheduler)

self-hosted/logger.go

@@ -0,0 +1,40 @@
+package main
+
+import (
+	"log/slog"
+	"os"
+	"strings"
+)
+
+// newLogger builds a JSON slog logger writing to stdout at the given level.
+// Unknown levels fall back to info and emit a warning on the new logger.
+func newLogger(level string) *slog.Logger {
+	lvl := parseLevel(level)
+	h := slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{Level: lvl})
+	l := slog.New(h)
+	if !knownLevel(level) {
+		l.Warn("unknown LOG_LEVEL, using info", "got", level)
+	}
+	return l
+}
+
+func parseLevel(s string) slog.Level {
+	switch strings.ToLower(strings.TrimSpace(s)) {
+	case "debug":
+		return slog.LevelDebug
+	case "warn", "warning":
+		return slog.LevelWarn
+	case "error":
+		return slog.LevelError
+	default:
+		return slog.LevelInfo
+	}
+}
+
+func knownLevel(s string) bool {
+	switch strings.ToLower(strings.TrimSpace(s)) {
+	case "", "info", "debug", "warn", "warning", "error":
+		return true
+	}
+	return false
+}