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manager.go
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/
manager.go
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package run
import (
"os"
"os/signal"
"syscall"
exterrors "github.com/mgoltzsche/cntnr/pkg/errors"
"github.com/mgoltzsche/cntnr/pkg/log"
)
type ContainerGroup struct {
runners []Container
debug log.Logger
err error
}
func NewContainerGroup(debug log.Logger) *ContainerGroup {
return &ContainerGroup{nil, debug, nil}
}
func (m *ContainerGroup) Close() (err error) {
m.Stop()
err = m.err
for _, c := range m.runners {
err = exterrors.Append(err, c.Close())
}
m.runners = nil
return err
}
func (m *ContainerGroup) Add(c Container) {
m.runners = append(m.runners, c)
}
func (m *ContainerGroup) Start() {
if m.err != nil {
return
}
for i, c := range m.runners {
m.err = c.Start()
if m.err != nil {
m.debug.Println("start:", m.err)
for _, sc := range m.runners[0:i] {
sc.Stop()
m.err = exterrors.Append(m.err, sc.Wait())
}
return
}
}
return
}
func (m *ContainerGroup) Stop() {
for _, c := range m.runners {
c.Stop()
}
}
func (m *ContainerGroup) Wait() {
if m.err != nil {
return
}
m.handleSignals()
for _, c := range m.runners {
m.err = exterrors.Append(m.err, c.Wait())
}
return
}
// TODO: close signal channel if there is a use case where the process is not terminated afterwards
func (m *ContainerGroup) handleSignals() {
sigs := make(chan os.Signal, 1)
signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM, syscall.SIGKILL)
go func() {
<-sigs
m.Stop()
}()
}