iochaos_server.go

Documentation: github.com/chaos-mesh/chaos-mesh/pkg/chaosdaemon

     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 chaosdaemon
    17  
    18  import (
    19  	"context"
    20  	"encoding/json"
    21  	"fmt"
    22  	"os"
    23  	"strings"
    24  	"time"
    25  
    26  	jrpc "github.com/ethereum/go-ethereum/rpc"
    27  	"github.com/pkg/errors"
    28  
    29  	"github.com/chaos-mesh/chaos-mesh/api/v1alpha1"
    30  	"github.com/chaos-mesh/chaos-mesh/pkg/bpm"
    31  	pb "github.com/chaos-mesh/chaos-mesh/pkg/chaosdaemon/pb"
    32  )
    33  
    34  const (
    35  	todaBin = "/usr/local/bin/toda"
    36  )
    37  
    38  func (s *DaemonServer) ApplyIOChaos(ctx context.Context, in *pb.ApplyIOChaosRequest) (*pb.ApplyIOChaosResponse, error) {
    39  	log := s.getLoggerFromContext(ctx)
    40  	log.Info("applying io chaos", "Request", in)
    41  
    42  	if in.InstanceUid == "" {
    43  		if uid, ok := s.backgroundProcessManager.GetUID(bpm.ProcessPair{Pid: int(in.Instance), CreateTime: in.StartTime}); ok {
    44  			in.InstanceUid = uid
    45  		}
    46  	}
    47  
    48  	if in.InstanceUid != "" {
    49  		err := s.killIOChaos(ctx, in.InstanceUid)
    50  		if err != nil {
    51  			return nil, err
    52  		}
    53  	}
    54  
    55  	actions := []v1alpha1.IOChaosAction{}
    56  	err := json.Unmarshal([]byte(in.Actions), &actions)
    57  	if err != nil {
    58  		return nil, errors.Wrap(err, "unmarshal json bytes")
    59  	}
    60  
    61  	log.Info("the length of actions", "length", len(actions))
    62  	if len(actions) == 0 {
    63  		return &pb.ApplyIOChaosResponse{
    64  			Instance:  0,
    65  			StartTime: 0,
    66  		}, nil
    67  	}
    68  
    69  	pid, err := s.crClient.GetPidFromContainerID(ctx, in.ContainerId)
    70  	if err != nil {
    71  		return nil, errors.Wrap(err, "getting PID")
    72  	}
    73  
    74  	// TODO: make this log level configurable
    75  	args := fmt.Sprintf("--path %s --verbose info", in.Volume)
    76  	log.Info("executing", "cmd", todaBin+" "+args)
    77  
    78  	processBuilder := bpm.DefaultProcessBuilder(todaBin, strings.Split(args, " ")...).
    79  		EnableLocalMnt().
    80  		SetIdentifier(fmt.Sprintf("toda-%s", in.ContainerId))
    81  
    82  	if in.EnterNS {
    83  		processBuilder = processBuilder.SetNS(pid, bpm.MountNS).SetNS(pid, bpm.PidNS)
    84  	}
    85  
    86  	ctx, cancel := context.WithCancel(context.Background())
    87  	defer cancel()
    88  	cmd := processBuilder.Build(ctx)
    89  	cmd.Stderr = os.Stderr
    90  	proc, err := s.backgroundProcessManager.StartProcess(ctx, cmd)
    91  	if err != nil {
    92  		return nil, errors.Wrapf(err, "start process `%s`", cmd)
    93  	}
    94  
    95  	client, err := jrpc.DialIO(ctx, proc.Pipes.Stdout, proc.Pipes.Stdin)
    96  	if err != nil {
    97  		return nil, errors.Wrapf(err, "dialing rpc client")
    98  	}
    99  
   100  	var ret string
   101  	log.Info("Waiting for toda to start")
   102  	var rpcError error
   103  	maxWaitTime := time.Millisecond * 2000
   104  	timeOut, cancel := context.WithTimeout(ctx, maxWaitTime)
   105  	defer cancel()
   106  	_ = client.CallContext(timeOut, &ret, "update", actions)
   107  	rpcError = client.CallContext(timeOut, &ret, "get_status", "ping")
   108  	if rpcError != nil || ret != "ok" {
   109  		log.Info("Starting toda takes too long or encounter an error")
   110  		if kerr := s.killIOChaos(ctx, proc.Uid); kerr != nil {
   111  			log.Error(kerr, "kill toda", "request", in)
   112  		}
   113  		return nil, errors.Errorf("toda startup takes too long or an error occurs: %s", ret)
   114  	}
   115  
   116  	return &pb.ApplyIOChaosResponse{
   117  		Instance:    int64(proc.Pair.Pid),
   118  		StartTime:   proc.Pair.CreateTime,
   119  		InstanceUid: proc.Uid,
   120  	}, nil
   121  }
   122  
   123  func (s *DaemonServer) killIOChaos(ctx context.Context, uid string) error {
   124  	log := s.getLoggerFromContext(ctx)
   125  
   126  	err := s.backgroundProcessManager.KillBackgroundProcess(ctx, uid)
   127  	if err != nil {
   128  		return errors.Wrapf(err, "kill toda %s", uid)
   129  	}
   130  	log.Info("kill toda successfully", "uid", uid)
   131  	return nil
   132  }
   133