github.com/cloudwego/localsession@v0.0.2/stubs.go (about)

     1  // Copyright 2023 CloudWeGo Authors
     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  package localsession
    15  
    16  import (
    17  	"strconv"
    18  	_ "unsafe"
    19  
    20  	"github.com/modern-go/gls"
    21  )
    22  
    23  //go:nocheckptr
    24  func goID() uint64 {
    25  	return uint64(gls.GoID())
    26  }
    27  
    28  type labelMap map[string]string
    29  
    30  //go:linkname setPprofLabel runtime/pprof.runtime_setProfLabel
    31  func setPprofLabel(m *labelMap)
    32  
    33  //go:linkname getPproLabel runtime/pprof.runtime_getProfLabel
    34  func getPproLabel() *labelMap
    35  
    36  const Pprof_Label_Session_ID = "go_session_id"
    37  
    38  func transmitSessionID(id SessionID) {
    39  	m := getPproLabel()
    40  
    41  	var n labelMap
    42  	if m == nil {
    43  		n = make(labelMap)
    44  	} else {
    45  		n = make(labelMap, len(*m))
    46  		for k, v := range *m {
    47  			if k != Pprof_Label_Session_ID {
    48  				n[k] = v
    49  			}
    50  		}
    51  	}
    52  	
    53  	n[Pprof_Label_Session_ID] = strconv.FormatInt(int64(id), 10)
    54  	setPprofLabel(&n)
    55  }
    56  
    57  func getSessionID() (SessionID, bool) {
    58  	m := getPproLabel()
    59  	if m == nil {
    60  		return 0, false
    61  	}
    62  	if v, ok := (*m)[Pprof_Label_Session_ID]; !ok {
    63  		return 0, false
    64  	} else {
    65  		id, err := strconv.ParseInt(v, 10, 64)
    66  		if err != nil {
    67  			return 0, false
    68  		}
    69  		return SessionID(id), true
    70  	}
    71  }
    72  
    73  func clearSessionID() {
    74  	m := getPproLabel()
    75  	if m == nil {
    76  		return 
    77  	}
    78  	if _, ok := (*m)[Pprof_Label_Session_ID]; !ok {
    79  		return
    80  	}
    81  	n := make(labelMap, len(*m))
    82  	for k, v := range *m {
    83  		if k != Pprof_Label_Session_ID {
    84  			n[k] = v
    85  		}
    86  	}
    87  	setPprofLabel(&n)
    88  }