go.etcd.io/etcd@v3.3.27+incompatible/functional/tester/stresser_runner.go (about)

     1  // Copyright 2018 The etcd 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  package tester
    16  
    17  import (
    18  	"fmt"
    19  	"io/ioutil"
    20  	"os/exec"
    21  	"syscall"
    22  
    23  	"github.com/coreos/etcd/functional/rpcpb"
    24  
    25  	"go.uber.org/zap"
    26  	"golang.org/x/time/rate"
    27  )
    28  
    29  type runnerStresser struct {
    30  	stype              rpcpb.Stresser
    31  	etcdClientEndpoint string
    32  	lg                 *zap.Logger
    33  
    34  	cmd     *exec.Cmd
    35  	cmdStr  string
    36  	args    []string
    37  	rl      *rate.Limiter
    38  	reqRate int
    39  
    40  	errc  chan error
    41  	donec chan struct{}
    42  }
    43  
    44  func newRunnerStresser(
    45  	stype rpcpb.Stresser,
    46  	ep string,
    47  	lg *zap.Logger,
    48  	cmdStr string,
    49  	args []string,
    50  	rl *rate.Limiter,
    51  	reqRate int,
    52  ) *runnerStresser {
    53  	rl.SetLimit(rl.Limit() - rate.Limit(reqRate))
    54  	return &runnerStresser{
    55  		stype:              stype,
    56  		etcdClientEndpoint: ep,
    57  		cmdStr:             cmdStr,
    58  		args:               args,
    59  		rl:                 rl,
    60  		reqRate:            reqRate,
    61  		errc:               make(chan error, 1),
    62  		donec:              make(chan struct{}),
    63  	}
    64  }
    65  
    66  func (rs *runnerStresser) setupOnce() (err error) {
    67  	if rs.cmd != nil {
    68  		return nil
    69  	}
    70  
    71  	rs.cmd = exec.Command(rs.cmdStr, rs.args...)
    72  	stderr, err := rs.cmd.StderrPipe()
    73  	if err != nil {
    74  		return err
    75  	}
    76  
    77  	go func() {
    78  		defer close(rs.donec)
    79  		out, err := ioutil.ReadAll(stderr)
    80  		if err != nil {
    81  			rs.errc <- err
    82  		} else {
    83  			rs.errc <- fmt.Errorf("(%v %v) stderr %v", rs.cmdStr, rs.args, string(out))
    84  		}
    85  	}()
    86  
    87  	return rs.cmd.Start()
    88  }
    89  
    90  func (rs *runnerStresser) Stress() (err error) {
    91  	rs.lg.Info(
    92  		"stress START",
    93  		zap.String("stress-type", rs.stype.String()),
    94  	)
    95  	if err = rs.setupOnce(); err != nil {
    96  		return err
    97  	}
    98  	return syscall.Kill(rs.cmd.Process.Pid, syscall.SIGCONT)
    99  }
   100  
   101  func (rs *runnerStresser) Pause() map[string]int {
   102  	rs.lg.Info(
   103  		"stress STOP",
   104  		zap.String("stress-type", rs.stype.String()),
   105  	)
   106  	syscall.Kill(rs.cmd.Process.Pid, syscall.SIGSTOP)
   107  	return nil
   108  }
   109  
   110  func (rs *runnerStresser) Close() map[string]int {
   111  	syscall.Kill(rs.cmd.Process.Pid, syscall.SIGINT)
   112  	rs.cmd.Wait()
   113  	<-rs.donec
   114  	rs.rl.SetLimit(rs.rl.Limit() + rate.Limit(rs.reqRate))
   115  	return nil
   116  }
   117  
   118  func (rs *runnerStresser) ModifiedKeys() int64 {
   119  	return 1
   120  }