/
process.go
82 lines (72 loc) · 1.72 KB
/
process.go
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package main
import (
"log"
"os/exec"
"sync"
"syscall"
)
type processInfo struct {
cmd *exec.Cmd
}
type processMap struct {
sync.RWMutex
values map[int]*processInfo
}
type ProcessManager struct {
processes processMap
}
func NewProcessManager(cmds []PluginConfig) *ProcessManager {
p := ProcessManager{processes: processMap{values: make(map[int]*processInfo)}}
p.processes.Lock()
defer p.processes.Unlock()
for idx, cmd := range cmds {
pi := &processInfo{exec.Command(cmd.GetPath(), cmd.GetArgs()...)}
pi.cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
// TODO: chroot here too
p.processes.values[idx] = pi
}
return &p
}
func (x *ProcessManager) NumProcs() int {
x.processes.RLock()
defer x.processes.RUnlock()
return len(x.processes.values)
}
func (x *ProcessManager) StartProcesses() error {
x.processes.RLock()
defer x.processes.RUnlock()
for idx, pi := range x.processes.values {
if err := pi.cmd.Start(); err != nil {
return err
}
go x.MonitorProcess(idx, pi)
log.Println("Started process:", pi.cmd.Path)
}
return nil
}
func (x *ProcessManager) MonitorProcess(idx int, pi *processInfo) {
err := pi.cmd.Wait()
if err != nil {
// TODO: don't do anything if *we* killed the process
x.processes.Lock()
delete(x.processes.values, idx)
x.processes.Unlock()
errExit(err.Error())
}
}
func (x *ProcessManager) KillProcesses() error {
x.processes.Lock()
defer x.processes.Unlock()
for _, pi := range x.processes.values {
// we could potentially fail before the processes are correctly started
// in that case, do nothing
if pi.cmd.Process != nil {
pgid, err := syscall.Getpgid(pi.cmd.Process.Pid)
if err != nil {
return err
}
syscall.Kill(-pgid, 15)
}
}
return nil
}