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package common
import (
"errors"
"fmt"
"log"
"time"
"github.com/aws/aws-sdk-go/service/ec2"
"github.com/hashicorp/packer/packer-plugin-sdk/multistep"
)
type ec2Describer interface {
DescribeInstances(*ec2.DescribeInstancesInput) (*ec2.DescribeInstancesOutput, error)
}
var (
// modified in tests
sshHostSleepDuration = time.Second
)
// SSHHost returns a function that can be given to the SSH communicator
// for determining the SSH address based on the instance DNS name.
func SSHHost(e ec2Describer, sshInterface string, host string) func(multistep.StateBag) (string, error) {
return func(state multistep.StateBag) (string, error) {
if host != "" {
log.Printf("Using host value: %s", host)
return host, nil
}
if sshInterface == "session_manager" {
return "localhost", nil
}
const tries = 2
// <= with current structure to check result of describing `tries` times
for j := 0; j <= tries; j++ {
i := state.Get("instance").(*ec2.Instance)
if sshInterface != "" {
switch sshInterface {
case "public_ip":
if i.PublicIpAddress != nil {
host = *i.PublicIpAddress
}
case "private_ip":
if i.PrivateIpAddress != nil {
host = *i.PrivateIpAddress
}
case "public_dns":
if i.PublicDnsName != nil {
host = *i.PublicDnsName
}
case "private_dns":
if i.PrivateDnsName != nil {
host = *i.PrivateDnsName
}
default:
panic(fmt.Sprintf("Unknown interface type: %s", sshInterface))
}
} else if i.VpcId != nil && *i.VpcId != "" {
if i.PublicIpAddress != nil && *i.PublicIpAddress != "" {
host = *i.PublicIpAddress
} else if i.PrivateIpAddress != nil && *i.PrivateIpAddress != "" {
host = *i.PrivateIpAddress
}
} else if i.PublicDnsName != nil && *i.PublicDnsName != "" {
host = *i.PublicDnsName
}
if host != "" {
return host, nil
}
r, err := e.DescribeInstances(&ec2.DescribeInstancesInput{
InstanceIds: []*string{i.InstanceId},
})
if err != nil {
return "", err
}
if len(r.Reservations) == 0 || len(r.Reservations[0].Instances) == 0 {
return "", fmt.Errorf("instance not found: %s", *i.InstanceId)
}
state.Put("instance", r.Reservations[0].Instances[0])
time.Sleep(sshHostSleepDuration)
}
return "", errors.New("couldn't determine address for instance")
}
}
// Port returns a function that can be given to the communicator
// for determining the port to use when connecting to an instance.
func Port(sshInterface string, port int) func(multistep.StateBag) (int, error) {
return func(state multistep.StateBag) (int, error) {
if sshInterface != "session_manager" {
return port, nil
}
port, ok := state.GetOk("sessionPort")
if !ok {
return 0, fmt.Errorf("no local port defined for session-manager")
}
return port.(int), nil
}
}
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