networkchaos.go

Documentation: github.com/chaos-mesh/chaos-mesh/pkg/chaosctl/recover

     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 recover
    17  
    18  import (
    19  	"context"
    20  	"fmt"
    21  	"regexp"
    22  	"strconv"
    23  	"strings"
    24  
    25  	"github.com/pingcap/errors"
    26  
    27  	ctrlclient "github.com/chaos-mesh/chaos-mesh/pkg/ctrl/client"
    28  )
    29  
    30  // match handle number and device in tc qdisc rules
    31  // ### Rules Example:
    32  // We can match handle number `8001` and device `vnet0` in the following rule:
    33  // ```
    34  // qdisc noqueue 8001: dev vnet0 root refcnt 2
    35  // ```
    36  var tcRegexp = regexp.MustCompile(`([0-9]+): dev (\w+)`)
    37  
    38  type tcsRecoverer struct {
    39  	client *ctrlclient.CtrlClient
    40  }
    41  
    42  func newTcsRecoverer(client *ctrlclient.CtrlClient) Recoverer {
    43  	return &tcsRecoverer{
    44  		client: client,
    45  	}
    46  }
    47  
    48  // Recover clean all tc qdisc rules
    49  func (r *tcsRecoverer) Recover(ctx context.Context, pod *PartialPod) error {
    50  	deviceSet := map[string]bool{}
    51  	for _, rule := range pod.TcQdisc {
    52  		matches := tcRegexp.FindStringSubmatch(rule)
    53  		if len(matches) != 3 {
    54  			continue
    55  		}
    56  		handle, err := strconv.Atoi(matches[1])
    57  		if err != nil {
    58  			return errors.Wrapf(err, "parse tc qdisc handle: `%s`", matches[1])
    59  		}
    60  		if handle > 0 {
    61  			// if handle is 0, it's unnecessary to clean
    62  			deviceSet[matches[2]] = true
    63  		}
    64  	}
    65  
    66  	var devices []string
    67  	for dev := range deviceSet {
    68  		devices = append(devices, dev)
    69  	}
    70  
    71  	if len(devices) == 0 {
    72  		printStep("all tc rules are cleaned up")
    73  		return nil
    74  	}
    75  	printStep(fmt.Sprintf("cleaning tc rules for device %v", devices))
    76  
    77  	cleanedTcs, err := r.client.CleanTcs(ctx, pod.Namespace, pod.Name, devices)
    78  	if err != nil {
    79  		return err
    80  	}
    81  
    82  	if len(cleanedTcs) != 0 {
    83  		printStep(fmt.Sprintf("tc rules on device %s are cleaned up", strings.Join(cleanedTcs, ",")))
    84  	}
    85  
    86  	return nil
    87  }
    88  
    89  type iptablesRecoverer struct {
    90  	client *ctrlclient.CtrlClient
    91  }
    92  
    93  func newIptablesRecoverer(client *ctrlclient.CtrlClient) Recoverer {
    94  	return &iptablesRecoverer{
    95  		client: client,
    96  	}
    97  }
    98  
    99  // Recover clean all tables rules in chains CHAOS-INPUT and CHAOS-OUTPUT
   100  func (r *iptablesRecoverer) Recover(ctx context.Context, pod *PartialPod) error {
   101  	chainSet := map[string]bool{
   102  		"CHAOS-INPUT":  false,
   103  		"CHAOS-OUTPUT": false,
   104  	}
   105  	for _, rule := range pod.Iptables {
   106  		for chain := range chainSet {
   107  			if strings.HasPrefix(rule, fmt.Sprintf("Chain %s", chain)) {
   108  				chainSet[chain] = true
   109  			}
   110  		}
   111  	}
   112  
   113  	var chains []string
   114  	for chain, ok := range chainSet {
   115  		if ok {
   116  			chains = append(chains, chain)
   117  		}
   118  	}
   119  
   120  	if len(chains) == 0 {
   121  		printStep("all iptables rules are cleaned up")
   122  		return nil
   123  	}
   124  	printStep(fmt.Sprintf("cleaning iptables rules for chains %v", chains))
   125  
   126  	cleanedChains, err := r.client.CleanIptables(ctx, pod.Namespace, pod.Name, chains)
   127  	if err != nil {
   128  		return err
   129  	}
   130  
   131  	if len(cleanedChains) != 0 {
   132  		printStep(fmt.Sprintf("iptables rules in chains %s are cleaned up", strings.Join(cleanedChains, ",")))
   133  	}
   134  
   135  	return nil
   136  }
   137  
   138  type networkRecoverer struct {
   139  	tcsRecoverer      Recoverer
   140  	iptablesRecoverer Recoverer
   141  }
   142  
   143  func NetworkRecoverer(client *ctrlclient.CtrlClient) Recoverer {
   144  	return &networkRecoverer{
   145  		tcsRecoverer:      newTcsRecoverer(client),
   146  		iptablesRecoverer: newIptablesRecoverer(client),
   147  	}
   148  }
   149  
   150  func (r *networkRecoverer) Recover(ctx context.Context, pod *PartialPod) error {
   151  	err := r.tcsRecoverer.Recover(ctx, pod)
   152  	if err != nil {
   153  		return errors.Wrap(err, "recover tcs rules")
   154  	}
   155  	err = r.iptablesRecoverer.Recover(ctx, pod)
   156  	if err != nil {
   157  		return errors.Wrap(err, "recover iptables rules")
   158  	}
   159  	return nil
   160  }
   161