init, eod commit

util/logger/structs.go

@@ -0,0 +1,27 @@
+package logger
+
+import (
+	"io"
+	"log/slog"
+	"os"
+	"sync"
+)
+
+type fileRouter struct {
+	mu            sync.RWMutex
+	handlers      map[string]slog.Handler // map[filePath]handler
+	files         map[string]*os.File     // map[filePath]*os.File to close later
+	baseDir       string
+	rotationDays  int
+	id            string
+	dirTimeLayout string // "2006-01-02" - daily dirs
+}
+
+// prefixWriter - writes a prefix at the start of each new line.
+// It is safe for concurrent use.
+type prefixWriter struct {
+	inner     io.Writer
+	prefix    []byte
+	mu        sync.Mutex
+	startLine bool
+}