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process_group.go
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/
process_group.go
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package grouper
import (
"errors"
"fmt"
"os"
"github.com/tedsuo/ifrit"
)
type ProcessGroup interface {
ifrit.Process
Exits() <-chan Member
}
func EnvokeGroup(rGroup RunGroup) ProcessGroup {
count := len(rGroup)
p := make(processGroup, count)
mChan := make(MemberChan, count)
for name, runner := range rGroup {
go mChan.envokeMember(name, runner)
}
for i := 0; i < count; i++ {
p[i] = <-mChan
}
return p
}
type Member struct {
Name string
Process ifrit.Process
Error error
}
type MemberChan chan Member
func (mChan MemberChan) envokeMember(name string, runner ifrit.Runner) {
mChan <- Member{Name: name, Process: ifrit.Envoke(runner)}
}
type processGroup []Member
func (group processGroup) Signal(signal os.Signal) {
for _, m := range group {
m.Process.Signal(signal)
}
}
func (group processGroup) Wait() <-chan error {
errChan := make(chan error, 1)
go func() {
errChan <- group.waitForGroup()
}()
return errChan
}
func (group processGroup) Exits() <-chan Member {
memChan := make(MemberChan, len(group))
for _, m := range group {
go group.waitForMember(memChan, m)
}
return memChan
}
func (group processGroup) waitForMember(memChan MemberChan, m Member) {
err := <-m.Process.Wait()
m.Error = err
memChan <- m
}
func (group processGroup) waitForGroup() error {
var errMsg string
for _, m := range group {
err := <-m.Process.Wait()
if err != nil {
errMsg += fmt.Sprintf("%s: %s\n", m.Name, err)
}
}
var err error
if errMsg != "" {
err = errors.New(errMsg)
}
return err
}