fix #3191 (#3194)

example/nosql/redis/adapter/main.go

@@ -0,0 +1,52 @@
+package main
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/gogf/gf/contrib/nosql/redis/v2"
+
+	"github.com/gogf/gf/v2/container/gvar"
+	"github.com/gogf/gf/v2/database/gredis"
+	"github.com/gogf/gf/v2/frame/g"
+	"github.com/gogf/gf/v2/os/gctx"
+)
+
+var (
+	ctx    = gctx.New()
+	group  = "cache"
+	config = gredis.Config{
+		Address: "127.0.0.1:6379",
+		Db:      1,
+	}
+)
+
+// MyRedis description
+type MyRedis struct {
+	*redis.Redis
+}
+
+// Do implements and overwrites the underlying function Do from Adapter.
+func (r *MyRedis) Do(ctx context.Context, command string, args ...interface{}) (*gvar.Var, error) {
+	fmt.Println("MyRedis Do:", command, args)
+	return r.Redis.Do(ctx, command, args...)
+}
+
+func main() {
+	gredis.RegisterAdapterFunc(func(config *gredis.Config) gredis.Adapter {
+		r := &MyRedis{redis.New(config)}
+		r.AdapterOperation = r // This is necessary.
+		return r
+	})
+	gredis.SetConfig(&config, group)
+
+	_, err := g.Redis(group).Set(ctx, "key", "value")
+	if err != nil {
+		g.Log().Fatal(ctx, err)
+	}
+	value, err := g.Redis(group).Get(ctx, "key")
+	if err != nil {
+		g.Log().Fatal(ctx, err)
+	}
+	fmt.Println(value.String())
+}