86 lines
2.4 KiB
Go
86 lines
2.4 KiB
Go
package common
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import (
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"errors"
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"fmt"
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"time"
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"github.com/aws/aws-sdk-go/service/ec2"
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"github.com/mitchellh/multistep"
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"golang.org/x/crypto/ssh"
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)
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type ec2Describer interface {
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DescribeInstances(*ec2.DescribeInstancesInput) (*ec2.DescribeInstancesOutput, error)
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}
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var (
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// modified in tests
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sshHostSleepDuration = time.Second
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)
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// SSHHost returns a function that can be given to the SSH communicator
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// for determining the SSH address based on the instance DNS name.
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func SSHHost(e ec2Describer, private bool) func(multistep.StateBag) (string, error) {
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return func(state multistep.StateBag) (string, error) {
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const tries = 2
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// <= with current structure to check result of describing `tries` times
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for j := 0; j <= tries; j++ {
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var host string
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i := state.Get("instance").(*ec2.Instance)
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if i.VpcId != nil && *i.VpcId != "" {
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if i.PublicIpAddress != nil && *i.PublicIpAddress != "" && !private {
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host = *i.PublicIpAddress
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} else if i.PrivateIpAddress != nil && *i.PrivateIpAddress != "" {
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host = *i.PrivateIpAddress
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}
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} else if private && i.PrivateIpAddress != nil && *i.PrivateIpAddress != "" {
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host = *i.PrivateIpAddress
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} else if i.PublicDnsName != nil && *i.PublicDnsName != "" {
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host = *i.PublicDnsName
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}
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if host != "" {
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return host, nil
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}
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r, err := e.DescribeInstances(&ec2.DescribeInstancesInput{
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InstanceIds: []*string{i.InstanceId},
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})
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if err != nil {
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return "", err
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}
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if len(r.Reservations) == 0 || len(r.Reservations[0].Instances) == 0 {
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return "", fmt.Errorf("instance not found: %s", *i.InstanceId)
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}
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state.Put("instance", r.Reservations[0].Instances[0])
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time.Sleep(sshHostSleepDuration)
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}
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return "", errors.New("couldn't determine IP address for instance")
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}
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}
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// SSHConfig returns a function that can be used for the SSH communicator
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// config for connecting to the instance created over SSH using the generated
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// private key.
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func SSHConfig(username string) func(multistep.StateBag) (*ssh.ClientConfig, error) {
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return func(state multistep.StateBag) (*ssh.ClientConfig, error) {
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privateKey := state.Get("privateKey").(string)
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signer, err := ssh.ParsePrivateKey([]byte(privateKey))
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if err != nil {
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return nil, fmt.Errorf("Error setting up SSH config: %s", err)
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}
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return &ssh.ClientConfig{
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User: username,
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Auth: []ssh.AuthMethod{
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ssh.PublicKeys(signer),
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},
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}, nil
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}
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}
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