forked from joshpmcghee/parsec-terraform
/
helpers.go
226 lines (175 loc) · 4.8 KB
/
helpers.go
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package cmd
import (
"fmt"
"net/http"
"os"
"io/ioutil"
"os/exec"
"errors"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/ec2"
"strings"
)
func getExternalIP() (string, error) {
resp, err := http.Get("https://ipv4.icanhazip.com")
if err != nil {
return "", err
}
defer resp.Body.Close()
if resp.StatusCode == 200 {
b, err := ioutil.ReadAll(resp.Body)
if err != nil {
return "", nil
}
return fmt.Sprintf("%s/%s", strings.TrimSpace(string(b)), "32"), nil
}
return "", errors.New("Could not get external ip address.")
}
func getEc2Client(region string) (*ec2.EC2, error) {
session, err := session.NewSession()
if err != nil {
return nil, err
}
config := aws.Config{
Region: aws.String(region),
}
return ec2.New(session, &config), nil
}
func getVpcID(svc *ec2.EC2) (string, error) {
vpc, err := svc.DescribeVpcs(&ec2.DescribeVpcsInput{})
if err != nil {
return "", err
}
if len(vpc.Vpcs) < 1 {
fmt.Println(`You have at some point manually deleted the default VPC created by AWS for this region.
parsec-ec2 will not function for this region until a default VPC is recreated for it.
You can still try to launch Parsec EC2 instances in other regions that have retained
their default VPC.`)
os.Exit(0)
}
return *vpc.Vpcs[0].VpcId, nil
}
func getSubnetID(svc *ec2.EC2, availabilityZone string) (string, error) {
values := []*string{&availabilityZone}
filter := ec2.Filter{
Name: aws.String("availability-zone"),
Values: values,
}
filters := []*ec2.Filter{&filter}
describeSubnetsInput := ec2.DescribeSubnetsInput{
Filters: filters,
}
result, err := svc.DescribeSubnets(&describeSubnetsInput)
if err != nil {
return "", err
}
if len(result.Subnets) == 0 {
fmt.Printf("Could not get the subnet id for availability zone %s.\n", availabilityZone)
os.Exit(1)
}
return *result.Subnets[0].SubnetId, nil
}
func copy(source, destination string) error {
b, err := ioutil.ReadFile(source)
if err != nil {
return err
}
return ioutil.WriteFile(destination, b, 0644)
}
func hasServerKey(serverKey string) bool {
return len(serverKey) > 0
}
func tfCmd(args []string) *exec.Cmd {
command := exec.Command(Terraform, args...)
command.Dir = installPath
command.Env = os.Environ()
return command
}
func tfCmdVars(p TfVars, args []string) *exec.Cmd {
command := exec.Command(Terraform, args...)
command.Dir = installPath
command.Env = os.Environ()
command.Env = append(command.Env, fmt.Sprintf("TF_VAR_instance_type=%s", p.InstanceType))
command.Env = append(command.Env, fmt.Sprintf("TF_VAR_region=%s", p.Region))
command.Env = append(command.Env, fmt.Sprintf("TF_VAR_server_key=%s", p.ServerKey))
command.Env = append(command.Env, fmt.Sprintf("TF_VAR_spot_price=%s", p.SpotPrice))
command.Env = append(command.Env, fmt.Sprintf("TF_VAR_subnet_id=%s", p.SubnetID))
command.Env = append(command.Env, fmt.Sprintf("TF_VAR_vpc_id=%s", p.VpcID))
command.Env = append(command.Env, fmt.Sprintf("TF_VAR_ami=%s", p.AmiName))
command.Env = append(command.Env, fmt.Sprintf("TF_VAR_volume_size=%d", p.VolumeSize))
command.Env = append(command.Env, fmt.Sprintf("TF_VAR_ip=%s", p.IP))
return command
}
func executeSilent(command *exec.Cmd) error {
commandErr, err := command.StderrPipe()
if err != nil {
return err
}
err = command.Start()
if err != nil {
return err
}
errOutput, err := ioutil.ReadAll(commandErr)
if err != nil {
return err
}
if len(errOutput) > 0 {
return fmt.Errorf("Error executing Terraform command: %s\nError Output: %s", command.Args[1], errOutput)
}
return nil
}
func executeReturn(command *exec.Cmd) ([]byte, error) {
initOut, err := command.StdoutPipe()
if err != nil {
return []byte{}, err
}
initErr, err := command.StderrPipe()
if err != nil {
return []byte{}, err
}
err = command.Start()
if err != nil {
return []byte{}, err
}
stdOutput, err := ioutil.ReadAll(initOut)
if err != nil {
return []byte{}, err
}
errOutput, err := ioutil.ReadAll(initErr)
if err != nil {
return []byte{}, err
}
if len(errOutput) > 0 {
return []byte{}, fmt.Errorf("Error executing Terraform command: %s\nError Output: %s", command.Args[1], errOutput)
}
return stdOutput, nil
}
func executePrint(command *exec.Cmd) error {
commandOut, err := command.StdoutPipe()
if err != nil {
return err
}
commandErr, err := command.StderrPipe()
if err != nil {
return err
}
err = command.Start()
if err != nil {
return err
}
stdOutput, err := ioutil.ReadAll(commandOut)
if err != nil {
return err
}
errOutput, err := ioutil.ReadAll(commandErr)
if err != nil {
return err
}
if len(errOutput) > 0 {
return fmt.Errorf("Error executing Terraform command: %s\nError output: %s", command.Args[1], errOutput)
}
fmt.Printf("%s\n", stdOutput)
fmt.Printf("%s\n", errOutput)
return nil
}