iochaos_server.go

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

     1  // Copyright 2020 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  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package chaosdaemon
    15  
    16  import (
    17  	"context"
    18  	"encoding/json"
    19  	"fmt"
    20  	"io"
    21  	"os"
    22  	"strings"
    23  	"time"
    24  
    25  	"github.com/shirou/gopsutil/process"
    26  
    27  	jrpc "github.com/ethereum/go-ethereum/rpc"
    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.Info("applying io chaos", "Request", in)
    40  
    41  	if in.Instance != 0 {
    42  		err := s.killIoChaos(ctx, in.Instance, in.StartTime)
    43  		if err != nil {
    44  			return nil, err
    45  		}
    46  	}
    47  
    48  	actions := []v1alpha1.IoChaosAction{}
    49  	err := json.Unmarshal([]byte(in.Actions), &actions)
    50  	if err != nil {
    51  		log.Error(err, "error while unmarshal json bytes")
    52  		return nil, err
    53  	}
    54  
    55  	log.Info("the length of actions", "length", len(actions))
    56  	if len(actions) == 0 {
    57  		return &pb.ApplyIoChaosResponse{
    58  			Instance:  0,
    59  			StartTime: 0,
    60  		}, nil
    61  	}
    62  
    63  	pid, err := s.crClient.GetPidFromContainerID(ctx, in.ContainerId)
    64  	if err != nil {
    65  		log.Error(err, "error while getting PID")
    66  		return nil, err
    67  	}
    68  
    69  	// TODO: make this log level configurable
    70  	args := fmt.Sprintf("--path %s --verbose info", in.Volume)
    71  	log.Info("executing", "cmd", todaBin+" "+args)
    72  
    73  	processBuilder := bpm.DefaultProcessBuilder(todaBin, strings.Split(args, " ")...).
    74  		EnableLocalMnt().
    75  		SetIdentifier(in.ContainerId)
    76  
    77  	if in.EnterNS {
    78  		processBuilder = processBuilder.SetNS(pid, bpm.MountNS).SetNS(pid, bpm.PidNS)
    79  	}
    80  
    81  	ctx, cancel := context.WithCancel(context.Background())
    82  	defer cancel()
    83  	caller, receiver := bpm.NewBlockingBuffer(), bpm.NewBlockingBuffer()
    84  	defer caller.Close()
    85  	defer receiver.Close()
    86  	client, err := jrpc.DialIO(ctx, receiver, caller)
    87  	if err != nil {
    88  		return nil, err
    89  	}
    90  
    91  	cmd := processBuilder.Build()
    92  	cmd.Stdin = caller
    93  	cmd.Stdout = io.MultiWriter(receiver, os.Stdout)
    94  	cmd.Stderr = os.Stderr
    95  	err = s.backgroundProcessManager.StartProcess(cmd)
    96  	if err != nil {
    97  		log.Error(err, "bpm failed")
    98  		return nil, err
    99  	}
   100  	var ret string
   101  
   102  	procState, err := process.NewProcess(int32(cmd.Process.Pid))
   103  	if err != nil {
   104  		log.Error(err, "new process failed")
   105  		return nil, err
   106  	}
   107  	ct, err := procState.CreateTime()
   108  	if err != nil {
   109  		log.Error(err, "get create time failed")
   110  		if kerr := cmd.Process.Kill(); kerr != nil {
   111  			log.Error(kerr, "kill toda failed", "request", in)
   112  		}
   113  		return nil, err
   114  	}
   115  
   116  	log.Info("Waiting for toda to start")
   117  	var rpcError error
   118  	maxWaitTime := time.Millisecond * 2000
   119  	timeOut, cancel := context.WithTimeout(ctx, maxWaitTime)
   120  	defer cancel()
   121  	_ = client.CallContext(timeOut, &ret, "update", actions)
   122  	rpcError = client.CallContext(timeOut, &ret, "get_status", "ping")
   123  	if rpcError != nil || ret != "ok" {
   124  		log.Info("Starting toda takes too long or encounter an error")
   125  		caller.Close()
   126  		receiver.Close()
   127  		if kerr := s.killIoChaos(ctx, int64(cmd.Process.Pid), ct); kerr != nil {
   128  			log.Error(kerr, "kill toda failed", "request", in)
   129  		}
   130  		return nil, fmt.Errorf("Toda startup takes too long or an error occurs: %s", ret)
   131  	}
   132  
   133  	return &pb.ApplyIoChaosResponse{
   134  		Instance:  int64(cmd.Process.Pid),
   135  		StartTime: ct,
   136  	}, nil
   137  }
   138  
   139  func (s *DaemonServer) killIoChaos(ctx context.Context, pid int64, startTime int64) error {
   140  	log.Info("killing toda", "pid", pid)
   141  
   142  	err := s.backgroundProcessManager.KillBackgroundProcess(ctx, int(pid), startTime)
   143  	if err != nil {
   144  		return err
   145  	}
   146  	log.Info("kill toda successfully")
   147  	return nil
   148  }
   149