github.com/cloudwego/hertz@v0.9.3/pkg/app/server/binding/reflect.go (about)

     1  /*
     2   * Copyright 2023 CloudWeGo Authors
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   *     http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   * MIT License
    16   *
    17   * Copyright (c) 2019-present Fenny and Contributors
    18   *
    19   * Permission is hereby granted, free of charge, to any person obtaining a copy
    20   * of this software and associated documentation files (the "Software"), to deal
    21   * in the Software without restriction, including without limitation the rights
    22   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    23   * copies of the Software, and to permit persons to whom the Software is
    24   * furnished to do so, subject to the following conditions:
    25   *
    26   * The above copyright notice and this permission notice shall be included in all
    27   * copies or substantial portions of the Software.
    28   *
    29   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    30   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    31   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    32   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    33   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    34   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
    35   * SOFTWARE.
    36   *
    37   * This file may have been modified by CloudWeGo authors. All CloudWeGo
    38   * Modifications are Copyright 2023 CloudWeGo Authors
    39   */
    40  
    41  package binding
    42  
    43  import (
    44  	"fmt"
    45  	"reflect"
    46  	"unsafe"
    47  )
    48  
    49  func valueAndTypeID(v interface{}) (reflect.Value, uintptr) {
    50  	header := (*emptyInterface)(unsafe.Pointer(&v))
    51  	rv := reflect.ValueOf(v)
    52  	return rv, header.typeID
    53  }
    54  
    55  type emptyInterface struct {
    56  	typeID  uintptr
    57  	dataPtr unsafe.Pointer
    58  }
    59  
    60  func checkPointer(rv reflect.Value) error {
    61  	if rv.Kind() != reflect.Ptr || rv.IsNil() {
    62  		return fmt.Errorf("receiver must be a non-nil pointer")
    63  	}
    64  	return nil
    65  }
    66  
    67  func dereferPointer(rv reflect.Value) reflect.Type {
    68  	rt := rv.Type()
    69  	for rt.Kind() == reflect.Ptr {
    70  		rt = rt.Elem()
    71  	}
    72  	return rt
    73  }