From e8b60495840f9674f151235ecfd0bfbfa3862e5a Mon Sep 17 00:00:00 2001
From: lion <chenxin619315@gmail.com>
Date: Fri, 12 Sep 2025 12:52:15 +0800
Subject: [PATCH] resource defer close and some optimizations

---
 binding/golang/go.mod          |  4 +---
 binding/golang/go.sum          |  2 --
 binding/golang/main.go         |  3 +++
 binding/golang/xdb/searcher.go |  2 --
 binding/golang/xdb/util.go     | 27 ++++++++-------------------
 binding/golang/xdb/version.go  | 19 ++++++++++---------
 6 files changed, 22 insertions(+), 35 deletions(-)

diff --git a/binding/golang/go.mod b/binding/golang/go.mod
index 2bb4dc1..130ba4c 100644
--- a/binding/golang/go.mod
+++ b/binding/golang/go.mod
@@ -2,6 +2,4 @@ module github.com/lionsoul2014/ip2region/binding/golang
 
 go 1.17
 
-require github.com/mitchellh/go-homedir v1.1.0
-
-require github.com/yookoala/realpath v1.0.0 // indirect
+require github.com/mitchellh/go-homedir v1.1.0
\ No newline at end of file
diff --git a/binding/golang/go.sum b/binding/golang/go.sum
index 837982a..ae38d14 100644
--- a/binding/golang/go.sum
+++ b/binding/golang/go.sum
@@ -1,4 +1,2 @@
 github.com/mitchellh/go-homedir v1.1.0 h1:lukF9ziXFxDFPkA1vsr5zpc1XuPDn/wFntq5mG+4E0Y=
 github.com/mitchellh/go-homedir v1.1.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrkLzIz1N1q0pr0=
-github.com/yookoala/realpath v1.0.0 h1:7OA9pj4FZd+oZDsyvXWQvjn5oBdcHRTV44PpdMSuImQ=
-github.com/yookoala/realpath v1.0.0/go.mod h1:gJJMA9wuX7AcqLy1+ffPatSCySA1FQ2S8Ya9AIoYBpE=
diff --git a/binding/golang/main.go b/binding/golang/main.go
index c6ff081..2bb0288 100644
--- a/binding/golang/main.go
+++ b/binding/golang/main.go
@@ -175,6 +175,7 @@ func testBench() {
 		fmt.Printf("failed to open source text file: %s\n", err)
 		return
 	}
+	defer handle.Close()
 
 	var count, tStart, costs = int64(0), time.Now(), int64(0)
 	var scanner = bufio.NewScanner(handle)
@@ -235,6 +236,8 @@ func createSearcher(dbPath string, cachePolicy string) (*xdb.Searcher, error) {
 		return nil, fmt.Errorf("open xdb file `%s`: %w", dbPath, err)
 	}
 
+	defer handle.Close()
+
 	// verify the xdb file
 	// @Note: do NOT call it every time you create a searcher since this will slow down the search response.
 	// @see the util.Verify function for details.
diff --git a/binding/golang/xdb/searcher.go b/binding/golang/xdb/searcher.go
index b1044b8..b93a829 100644
--- a/binding/golang/xdb/searcher.go
+++ b/binding/golang/xdb/searcher.go
@@ -84,8 +84,6 @@ type Searcher struct {
 	version *Version
 	handle  *os.File
 
-	// header info
-	header  *Header
 	ioCount int
 
 	// use it only when this feature enabled.
diff --git a/binding/golang/xdb/util.go b/binding/golang/xdb/util.go
index 2fb9114..50eaf92 100644
--- a/binding/golang/xdb/util.go
+++ b/binding/golang/xdb/util.go
@@ -69,11 +69,12 @@ func Verify(handle *os.File) error {
 
 	// get the runtime ptr bytes
 	runtimePtrBytes := 0
-	if header.Version == Structure20 {
+	switch header.Version {
+	case Structure20:
 		runtimePtrBytes = 4
-	} else if header.Version == Structure30 {
+	case Structure30:
 		runtimePtrBytes = header.RuntimePtrBytes
-	} else {
+	default:
 		return fmt.Errorf("invalid version: %d", header.Version)
 	}
 
@@ -98,10 +99,7 @@ func VerifyFromFile(dbFile string) error {
 	if err != nil {
 		return fmt.Errorf("open xdb file `%s`: %w", dbFile, err)
 	}
-
-	defer func(handle *os.File) {
-		_ = handle.Close()
-	}(handle)
+	defer handle.Close()
 
 	return Verify(handle)
 }
@@ -132,10 +130,7 @@ func LoadHeaderFromFile(dbFile string) (*Header, error) {
 	if err != nil {
 		return nil, fmt.Errorf("open xdb file `%s`: %w", dbFile, err)
 	}
-
-	defer func(handle *os.File) {
-		_ = handle.Close()
-	}(handle)
+	defer handle.Close()
 
 	header, err := LoadHeader(handle)
 	if err != nil {
@@ -177,10 +172,7 @@ func LoadVectorIndexFromFile(dbFile string) ([]byte, error) {
 	if err != nil {
 		return nil, fmt.Errorf("open xdb file `%s`: %w", dbFile, err)
 	}
-
-	defer func() {
-		_ = handle.Close()
-	}()
+	defer handle.Close()
 
 	vIndex, err := LoadVectorIndex(handle)
 	if err != nil {
@@ -225,10 +217,7 @@ func LoadContentFromFile(dbFile string) ([]byte, error) {
 	if err != nil {
 		return nil, fmt.Errorf("open xdb file `%s`: %w", dbFile, err)
 	}
-
-	defer func() {
-		_ = handle.Close()
-	}()
+	defer handle.Close()
 
 	cBuff, err := LoadContent(handle)
 	if err != nil {
diff --git a/binding/golang/xdb/version.go b/binding/golang/xdb/version.go
index 7a5358c..47234eb 100644
--- a/binding/golang/xdb/version.go
+++ b/binding/golang/xdb/version.go
@@ -82,15 +82,16 @@ func VersionFromHeader(header *Header) (*Version, error) {
 	}
 
 	// structure 3.0 after IPv6 supporting
-	if header.Version == Structure30 {
-		if header.IPVersion == IPv4VersionNo {
-			return IPv4, nil
-		} else if header.IPVersion == IPv6VersionNo {
-			return IPv6, nil
-		} else {
-			return IPvx, fmt.Errorf("invalid version `%d`", header.IPVersion)
-		}
+	if header.Version != Structure30 {
+		return IPvx, fmt.Errorf("invalid version `%d`", header.IPVersion)
 	}
 
-	return IPvx, fmt.Errorf("invalid version `%d`", header.Version)
+	switch header.IPVersion {
+	case IPv4VersionNo:
+		return IPv4, nil
+	case IPv6VersionNo:
+		return IPv6, nil
+	default:
+		return IPvx, fmt.Errorf("invalid version `%d`", header.Version)
+	}
 }