func startInstance(ec2HostConfig *config.Ec2HostConfig, instance *ec2.Instance, svc *ec2.EC2) error {
startCalled := false
instanceId := *instance.InstanceId
// wait until the state is anything but "pending"
statePoll:
for {
state, err := getInstanceState(instanceId, svc)
if err != nil {
return err
}
log.Printf("Instance %s is in state %s", instanceId, state)
switch state {
case "pending", "shutting-down", "stopping":
// for any of the transient states, just wait
time.Sleep(time.Second / 2)
case "running":
// running is the state we want to get to
break statePoll
case "stopped":
log.Printf("starting instance %s", instanceId)
if startCalled {
return fmt.Errorf("instance %s did not enter the running state", instanceId)
}
// start a stopped instance
params := &ec2.StartInstancesInput{
InstanceIds: []*string{aws.String(instanceId)},
}
_, err := svc.StartInstances(params)
if err != nil {
return err
}
startCalled = true
case "terminated":
return fmt.Errorf("Instance is terminated")
}
}
// wait for SSH port to be open, too
for {
// re-search for the instance, since it probably didn't have a public ip address
// when it was disconnected -- TODO refactor
if instance.PublicIpAddress == nil {
var err error
instance, err = findInstance(ec2HostConfig, svc)
if err != nil {
return fmt.Errorf("while searcihng for running instance: %s", err)
}
}
conn, err := net.Dial("tcp", fmt.Sprintf("%s:22", *instance.PublicIpAddress))
if err != nil {
log.Printf("connecting to port 22: %s; retrying", err)
time.Sleep(time.Second / 2)
} else {
conn.Close()
break
}
}
return nil
}