v3: Optimize IsFromLocal() performance (#3140)

Optimize IsFromLocal()

ctx.go

@@ -1841,21 +1841,9 @@ func (c *DefaultCtx) IsProxyTrusted() bool {
 	return false
 }
 
-var localHosts = [...]string{"127.0.0.1", "::1"}
-
-// IsLocalHost will return true if address is a localhost address.
-func (*DefaultCtx) isLocalHost(address string) bool {
-	for _, h := range localHosts {
-		if address == h {
-			return true
-		}
-	}
-	return false
-}
-
 // IsFromLocal will return true if request came from local.
 func (c *DefaultCtx) IsFromLocal() bool {
-	return c.isLocalHost(c.fasthttp.RemoteIP().String())
+	return c.fasthttp.RemoteIP().IsLoopback()
 }
 
 // Bind You can bind body, cookie, headers etc. into the map, map slice, struct easily by using Binding method.

ctx_test.go

@@ -6352,3 +6352,61 @@ func Benchmark_Ctx_IsProxyTrusted(b *testing.B) {
 		})
 	})
 }
+
+func Benchmark_Ctx_IsFromLocalhost(b *testing.B) {
+	// Scenario without localhost check
+	b.Run("Non_Localhost", func(b *testing.B) {
+		app := New()
+		c := app.AcquireCtx(&fasthttp.RequestCtx{})
+		c.Request().SetRequestURI("http://google.com:8080/test")
+		b.ReportAllocs()
+		b.ResetTimer()
+		for n := 0; n < b.N; n++ {
+			c.IsFromLocal()
+		}
+		app.ReleaseCtx(c)
+	})
+
+	// Scenario without localhost check in parallel
+	b.Run("Non_Localhost_Parallel", func(b *testing.B) {
+		app := New()
+		b.ReportAllocs()
+		b.ResetTimer()
+		b.RunParallel(func(pb *testing.PB) {
+			c := app.AcquireCtx(&fasthttp.RequestCtx{})
+			c.Request().SetRequestURI("http://google.com:8080/test")
+			for pb.Next() {
+				c.IsFromLocal()
+			}
+			app.ReleaseCtx(c)
+		})
+	})
+
+	// Scenario with localhost check
+	b.Run("Localhost", func(b *testing.B) {
+		app := New()
+		c := app.AcquireCtx(&fasthttp.RequestCtx{})
+		c.Request().SetRequestURI("http://localhost:8080/test")
+		b.ReportAllocs()
+		b.ResetTimer()
+		for n := 0; n < b.N; n++ {
+			c.IsFromLocal()
+		}
+		app.ReleaseCtx(c)
+	})
+
+	// Scenario with localhost check in parallel
+	b.Run("Localhost_Parallel", func(b *testing.B) {
+		app := New()
+		b.ReportAllocs()
+		b.ResetTimer()
+		b.RunParallel(func(pb *testing.PB) {
+			c := app.AcquireCtx(&fasthttp.RequestCtx{})
+			c.Request().SetRequestURI("http://localhost:8080/test")
+			for pb.Next() {
+				c.IsFromLocal()
+			}
+			app.ReleaseCtx(c)
+		})
+	})
+}