feat: impl. new protol design & new head

internal/file/file.go

@@ -0,0 +1,37 @@
+package file
+
+import (
+	"os"
+	"runtime"
+	"strings"
+)
+
+// IsExist 文件/路径存在
+func IsExist(path string) bool {
+	_, err := os.Stat(path)
+	return err == nil || os.IsExist(err)
+}
+
+// IsNotExist 文件/路径不存在
+func IsNotExist(path string) bool {
+	_, err := os.Stat(path)
+	return err != nil && os.IsNotExist(err)
+}
+
+// FolderName 本文件所在最下级文件夹名
+func FolderName() string {
+	_, file, _, ok := runtime.Caller(1)
+	if !ok {
+		return "<unk>"
+	}
+	i := strings.LastIndex(file, "/")
+	if i <= 0 {
+		return file
+	}
+	file = file[:i]
+	i = strings.LastIndex(file, "/")
+	if i <= 0 || i+1 >= len(file) {
+		return file
+	}
+	return file[i+1:]
+}

internal/file/log.go

@@ -0,0 +1,52 @@
+package file
+
+import (
+	"encoding/hex"
+	"runtime"
+	"strings"
+)
+
+func Header() string {
+	file, fn := fileFuncName(2)
+	sb := strings.Builder{}
+	sb.WriteString("[")
+	sb.WriteString(file)
+	sb.WriteString("] ")
+	sb.WriteString(fn)
+	return sb.String()
+}
+
+func fileFuncName(skip int) (string, string) {
+	pc, file, _, ok := runtime.Caller(skip)
+	if !ok {
+		return "unknown", "unknown"
+	}
+	fn := runtime.FuncForPC(pc).Name()
+	i := strings.LastIndex(fn, "/")
+	fn = fn[i+1:]
+	i = strings.LastIndex(file, "/")
+	if i < 0 {
+		i = strings.LastIndex(file, "\\")
+		if i < 0 {
+			return file, fn
+		}
+	}
+	nm := file[i+1:]
+	if len(nm) == 0 {
+		return file, fn
+	}
+	i = strings.LastIndex(nm, ".")
+	if i <= 0 {
+		return nm, fn
+	}
+	return nm[:i], fn
+}
+
+func ToLimitHexString(data []byte, bound int) string {
+	endl := "..."
+	if len(data) < bound {
+		bound = len(data)
+		endl = "."
+	}
+	return hex.EncodeToString(data[:bound]) + endl
+}