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https://github.com/etcd-io/etcd.git
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a9e04061b1
etcd tester runs etcd runner as a separate binary. it signals sigstop to the runner when tester wants to stop stressing. it signals sigcont to the runner when tester wants to start stressing. when tester needs to clean up, it signals sigint to runner. FIXES #7026
98 lines
2.1 KiB
Go
98 lines
2.1 KiB
Go
// Copyright 2017 The etcd Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package main
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import (
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"fmt"
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"io/ioutil"
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"os/exec"
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"syscall"
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"golang.org/x/time/rate"
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)
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type runnerStresser struct {
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cmd *exec.Cmd
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cmdStr string
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args []string
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rl *rate.Limiter
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reqRate int
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errc chan error
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donec chan struct{}
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}
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func newRunnerStresser(cmdStr string, args []string, rl *rate.Limiter, reqRate int) *runnerStresser {
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rl.SetLimit(rl.Limit() - rate.Limit(reqRate))
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return &runnerStresser{
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cmdStr: cmdStr,
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args: args,
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rl: rl,
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reqRate: reqRate,
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errc: make(chan error, 1),
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donec: make(chan struct{}),
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}
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}
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func (rs *runnerStresser) setupOnce() (err error) {
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if rs.cmd != nil {
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return nil
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}
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rs.cmd = exec.Command(rs.cmdStr, rs.args...)
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stderr, err := rs.cmd.StderrPipe()
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if err != nil {
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return err
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}
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go func() {
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defer close(rs.donec)
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out, err := ioutil.ReadAll(stderr)
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if err != nil {
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rs.errc <- err
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} else {
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rs.errc <- fmt.Errorf("(%v %v) stderr %v", rs.cmdStr, rs.args, string(out))
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}
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}()
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return rs.cmd.Start()
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}
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func (rs *runnerStresser) Stress() (err error) {
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if err = rs.setupOnce(); err != nil {
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return err
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}
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return syscall.Kill(rs.cmd.Process.Pid, syscall.SIGCONT)
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}
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func (rs *runnerStresser) Pause() {
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syscall.Kill(rs.cmd.Process.Pid, syscall.SIGSTOP)
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}
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func (rs *runnerStresser) Close() {
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syscall.Kill(rs.cmd.Process.Pid, syscall.SIGINT)
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rs.cmd.Wait()
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<-rs.donec
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rs.rl.SetLimit(rs.rl.Limit() + rate.Limit(rs.reqRate))
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}
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func (rs *runnerStresser) ModifiedKeys() int64 {
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return 1
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}
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func (rs *runnerStresser) Checker() Checker {
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return &runnerChecker{rs.errc}
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}
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