feat: 🎸 support concurrent map writes

filetype.go

@@ -29,8 +29,8 @@ func AddType(ext, mime string) types.Type {
 
 // Is checks if a given buffer matches with the given file type extension
 func Is(buf []byte, ext string) bool {
-	kind, ok := types.Types[ext]
-	if ok {
+	kind := types.Get(ext)
+	if kind != types.Unknown {
 		return IsType(buf, kind)
 	}
 	return false
@@ -52,33 +52,48 @@ func IsType(buf []byte, kind types.Type) bool {
 
 // IsMIME checks if a given buffer matches with the given MIME type
 func IsMIME(buf []byte, mime string) bool {
-	for _, kind := range types.Types {
+	result := false
+	types.Types.Range(func(k, v interface{}) bool {
+		kind := v.(types.Type)
 		if kind.MIME.Value == mime {
 			matcher := matchers.Matchers[kind]
-			return matcher(buf) != types.Unknown
+			result = matcher(buf) != types.Unknown
+			return false
 		}
-	}
-	return false
+		return true
+	})
+
+	return result
 }
 
 // IsSupported checks if a given file extension is supported
 func IsSupported(ext string) bool {
-	for name := range Types {
-		if name == ext {
-			return true
+	result := false
+	types.Types.Range(func(k, v interface{}) bool {
+		key := k.(string)
+		if key == ext {
+			result = true
+			return false
 		}
-	}
-	return false
+		return true
+	})
+
+	return result
 }
 
 // IsMIMESupported checks if a given MIME type is supported
 func IsMIMESupported(mime string) bool {
-	for _, m := range Types {
-		if m.MIME.Value == mime {
-			return true
+	result := false
+	types.Types.Range(func(k, v interface{}) bool {
+		kind := v.(types.Type)
+		if kind.MIME.Value == mime {
+			result = true
+			return false
 		}
-	}
-	return false
+		return true
+	})
+
+	return result
 }
 
 // GetType retrieves a Type by file extension

filetype_test.go

@@ -2,10 +2,26 @@ package filetype
 
 import (
 	"testing"
+	"time"
 
 	"github.com/h2non/filetype/types"
 )
 
+func TestConcurrent(t *testing.T) {
+	go func() {
+		for i := 0; i < 10000; i++ {
+			types.NewType("xml", "text/xml")
+		}
+	}()
+	go func() {
+		for i := 0; i < 10000; i++ {
+			types.NewType("xml", "text/xml")
+		}
+	}()
+
+	time.Sleep(time.Second * 2)
+}
+
 func TestIs(t *testing.T) {
 	cases := []struct {
 		buf   []byte
@@ -22,6 +38,7 @@ func TestIs(t *testing.T) {
 			t.Fatalf("Invalid match: %s", test.ext)
 		}
 	}
+
 }
 
 func TestIsType(t *testing.T) {

types/types.go

@@ -1,18 +1,23 @@
 package types
 
-var Types = make(map[string]Type)
+import "sync"
+
+// Types Support concurrent map writes
+var Types sync.Map
 
 // Add registers a new type in the package
 func Add(t Type) Type {
-	Types[t.Extension] = t
+	Types.Store(t.Extension, t)
 	return t
 }
 
 // Get retrieves a Type by extension
 func Get(ext string) Type {
-	kind := Types[ext]
-	if kind.Extension != "" {
-		return kind
+	if tmp, ok := Types.Load(ext); ok {
+		kind := tmp.(Type)
+		if kind.Extension != "" {
+			return kind
+		}
 	}
 	return Unknown
 }