github.com/erda-project/erda-infra@v1.0.10-0.20240327085753-f3a249292aeb/pkg/trace/inject/hook/hook.go (about)

     1  // Copyright (c) 2021 Terminus, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package hook
    16  
    17  import (
    18  	"log"
    19  	"os"
    20  	"reflect"
    21  	"runtime"
    22  	"strconv"
    23  	"strings"
    24  
    25  	"github.com/brahma-adshonor/gohook"
    26  )
    27  
    28  const EnvTraceHookEnable = "TRACE_HOOK_ENABLE"
    29  
    30  // Hook .
    31  func Hook(target, replacement, trampoline interface{}) error {
    32  	defer func() {
    33  		if err := recover(); err != nil {
    34  			log.Printf("[ERROR] failed to hook %T : %v\n", target, err)
    35  		}
    36  	}()
    37  	if enabled, _ := strconv.ParseBool(os.Getenv(EnvTraceHookEnable)); !enabled {
    38  		return nil
    39  	}
    40  	err := gohook.Hook(target, replacement, trampoline)
    41  	if err == nil {
    42  		funcDecl := reflect.TypeOf(target).String()
    43  		funcDecl = strings.TrimPrefix(funcDecl, "func")
    44  		log.Printf("hook func %s%s", getFunctionName(target), funcDecl)
    45  	}
    46  	return err
    47  }
    48  
    49  func getFunctionName(i interface{}, seps ...rune) string {
    50  	fn := runtime.FuncForPC(reflect.ValueOf(i).Pointer()).Name()
    51  	return fn
    52  }