tc.go

Documentation: github.com/chaos-mesh/chaos-mesh/pkg/metrics/utils

     1  // Copyright 2021 Chaos Mesh 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  //
    15  
    16  package utils
    17  
    18  import (
    19  	"bufio"
    20  	"bytes"
    21  	"context"
    22  
    23  	"github.com/chaos-mesh/chaos-mesh/pkg/bpm"
    24  )
    25  
    26  func GetTcRulesNumberByNetNS(pid uint32) (int, error) {
    27  	return getTcRulesNumber(true, pid)
    28  }
    29  
    30  func getTcRulesNumber(enterNS bool, pid uint32) (int, error) {
    31  	builder := bpm.DefaultProcessBuilder("tc", "qdisc")
    32  	if enterNS {
    33  		builder = builder.SetNS(pid, bpm.NetNS)
    34  	}
    35  
    36  	out, err := builder.Build(context.TODO()).CombinedOutput()
    37  	if err != nil {
    38  		return 0, err
    39  	}
    40  
    41  	var lines int
    42  	scanner := bufio.NewScanner(bytes.NewReader(out))
    43  	scanner.Split(bufio.ScanLines)
    44  	for scanner.Scan() {
    45  		lines++
    46  	}
    47  
    48  	return lines, nil
    49  }
    50