func (r Restarter) Run(signals <-chan os.Signal, ready chan<- struct{}) error {
if r.Load == nil {
return ErrNoLoadCallback
}
process := ifrit.Background(r.Runner)
processReady := process.Ready()
exit := process.Wait()
signaled := false
for {
select {
case signal := <-signals:
process.Signal(signal)
signaled = true
case <-processReady:
close(ready)
processReady = nil
case err := <-exit:
if signaled {
return err
}
r.Runner = r.Load(r.Runner, err)
if r.Runner == nil {
return err
}
process = ifrit.Background(r.Runner)
exit = process.Wait()
}
}
}
func New(proxySignals <-chan os.Signal, runner ifrit.Runner) ifrit.Runner {
return ifrit.RunFunc(func(signals <-chan os.Signal, ready chan<- struct{}) error {
process := ifrit.Background(runner)
<-process.Ready()
close(ready)
go forwardSignals(proxySignals, process)
go forwardSignals(signals, process)
return <-process.Wait()
})
}
func Invoke(runner ifrit.Runner) ifrit.Process {
process := ifrit.Background(runner)
select {
case <-process.Ready():
case err := <-process.Wait():
ginkgo.Fail(fmt.Sprintf("process failed to start: %s", err))
}
return process
}
func (g *orderedGroup) orderedStart(signals <-chan os.Signal) (os.Signal, ErrorTrace) {
for _, member := range g.members {
p := ifrit.Background(member)
select {
case <-p.Ready():
g.pool[member.Name] = p
case err := <-p.Wait():
return nil, ErrorTrace{
ExitEvent{Member: member, Err: err},
}
case signal := <-signals:
return signal, nil
}
}
return nil, nil
}
func (g *parallelGroup) parallelStart(signals <-chan os.Signal) (os.Signal, ErrorTrace) {
numMembers := len(g.members)
cases := make([]reflect.SelectCase, 2*numMembers+1)
for i, member := range g.members {
process := ifrit.Background(member)
g.pool[member.Name] = process
cases[2*i] = reflect.SelectCase{
Dir: reflect.SelectRecv,
Chan: reflect.ValueOf(process.Wait()),
}
cases[2*i+1] = reflect.SelectCase{
Dir: reflect.SelectRecv,
Chan: reflect.ValueOf(process.Ready()),
}
}
cases[2*numMembers] = reflect.SelectCase{
Dir: reflect.SelectRecv,
Chan: reflect.ValueOf(signals),
}
numReady := 0
for {
chosen, recv, _ := reflect.Select(cases)
switch {
case chosen == 2*numMembers:
return recv.Interface().(os.Signal), nil
case chosen%2 == 0:
recvError, _ := recv.Interface().(error)
return nil, ErrorTrace{ExitEvent{Member: g.members[chosen/2], Err: recvError}}
default:
cases[chosen].Chan = reflect.Zero(cases[chosen].Chan.Type())
numReady++
if numReady == numMembers {
return nil, nil
}
}
}
}
var (
lifecycle ifrit.Process
fakeDeamonRunner func(signals <-chan os.Signal, ready chan<- struct{}) error
)
BeforeEach(func() {
builder := main.Builder{
RepoName: "ubuntu",
Tag: "latest",
OutputFilename: "/tmp/result/result.json",
DockerDaemonTimeout: 300 * time.Millisecond,
CacheDockerImage: true,
}
lifecycle = ifrit.Background(grouper.NewParallel(os.Interrupt, grouper.Members{
{"builder", ifrit.RunFunc(builder.Run)},
{"fake_docker_daemon", ifrit.RunFunc(fakeDeamonRunner)},
}))
})
AfterEach(func() {
ginkgomon.Interrupt(lifecycle)
})
Context("when the daemon won't start", func() {
fakeDeamonRunner = func(signals <-chan os.Signal, ready chan<- struct{}) error {
close(ready)
select {
case signal := <-signals:
return errors.New(signal.String())
case <-time.After(1 * time.Second):
// Daemon "crashes" after a while
var testRunner *fake_runner.TestRunner
var restarter restart.Restarter
var process ifrit.Process
BeforeEach(func() {
testRunner = fake_runner.NewTestRunner()
restarter = restart.Restarter{
Runner: testRunner,
Load: func(runner ifrit.Runner, err error) ifrit.Runner {
return nil
},
}
})
JustBeforeEach(func() {
process = ifrit.Background(restarter)
})
AfterEach(func() {
process.Signal(os.Kill)
testRunner.EnsureExit()
Eventually(process.Wait()).Should(Receive())
})
Describe("Process Behavior", func() {
It("waits for the internal runner to be ready", func() {
Consistently(process.Ready()).ShouldNot(BeClosed())
testRunner.TriggerReady()
Eventually(process.Ready()).Should(BeClosed())
})
}
groupRunner = grouper.NewParallel(os.Interrupt, members)
})
AfterEach(func() {
childRunner1.EnsureExit()
childRunner2.EnsureExit()
childRunner3.EnsureExit()
ginkgomon.Kill(groupProcess)
})
Describe("Start", func() {
BeforeEach(func() {
groupProcess = ifrit.Background(groupRunner)
})
It("runs all runners at the same time", func() {
Eventually(childRunner1.RunCallCount).Should(Equal(1))
Eventually(childRunner2.RunCallCount).Should(Equal(1))
Eventually(childRunner3.RunCallCount).Should(Equal(1))
Consistently(groupProcess.Ready()).ShouldNot(BeClosed())
childRunner1.TriggerReady()
childRunner2.TriggerReady()
childRunner3.TriggerReady()
Eventually(groupProcess.Ready()).Should(BeClosed())
})
"github.com/cloudfoundry-incubator/docker_app_lifecycle/Godeps/_workspace/src/github.com/tedsuo/ifrit/proxy"
. "github.com/cloudfoundry-incubator/docker_app_lifecycle/Godeps/_workspace/src/github.com/onsi/ginkgo"
. "github.com/cloudfoundry-incubator/docker_app_lifecycle/Godeps/_workspace/src/github.com/onsi/gomega"
)
var _ = Describe("Proxy", func() {
var testRunner *fake_runner.TestRunner
var process ifrit.Process
var proxySignals chan os.Signal
var receivedSignals <-chan os.Signal
BeforeEach(func() {
proxySignals = make(chan os.Signal, 1)
testRunner = fake_runner.NewTestRunner()
process = ifrit.Background(proxy.New(proxySignals, testRunner))
receivedSignals = testRunner.WaitForCall()
testRunner.TriggerReady()
})
It("sends the proxied signals to the embedded runner", func() {
proxySignals <- os.Interrupt
Eventually(receivedSignals).Should(Receive(Equal(os.Interrupt)))
})
It("sends the process signals to the embedded runner", func() {
process.Signal(os.Interrupt)
Eventually(receivedSignals).Should(Receive(Equal(os.Interrupt)))
})
})
