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compute_util.go
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compute_util.go
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package google
import (
"fmt"
"io/ioutil"
"net/url"
"strings"
"time"
log "github.com/Sirupsen/logrus"
"github.com/docker/machine/ssh"
raw "google.golang.org/api/compute/v1"
)
// ComputeUtil is used to wrap the raw GCE API code and store common parameters.
type ComputeUtil struct {
zone string
instanceName string
userName string
project string
service *raw.Service
zoneURL string
authTokenPath string
globalURL string
ipAddress string
SwarmMaster bool
SwarmHost string
}
const (
apiURL = "https://www.googleapis.com/compute/v1/projects/"
imageName = "https://www.googleapis.com/compute/v1/projects/ubuntu-os-cloud/global/images/ubuntu-1404-trusty-v20150128"
firewallRule = "docker-machines"
port = "2376"
firewallTargetTag = "docker-machine"
dockerStartCommand = "sudo service docker start"
dockerStopCommand = "sudo service docker stop"
)
// NewComputeUtil creates and initializes a ComputeUtil.
func newComputeUtil(driver *Driver) (*ComputeUtil, error) {
service, err := newGCEService(driver.storePath, driver.AuthTokenPath)
if err != nil {
return nil, err
}
c := ComputeUtil{
authTokenPath: driver.AuthTokenPath,
zone: driver.Zone,
instanceName: driver.MachineName,
userName: driver.SSHUser,
project: driver.Project,
service: service,
zoneURL: apiURL + driver.Project + "/zones/" + driver.Zone,
globalURL: apiURL + driver.Project + "/global",
SwarmMaster: driver.SwarmMaster,
SwarmHost: driver.SwarmHost,
}
return &c, nil
}
func (c *ComputeUtil) diskName() string {
return c.instanceName + "-disk"
}
// disk returns the gce Disk.
func (c *ComputeUtil) disk() (*raw.Disk, error) {
return c.service.Disks.Get(c.project, c.zone, c.diskName()).Do()
}
// deleteDisk deletes the persistent disk.
func (c *ComputeUtil) deleteDisk() error {
log.Infof("Deleting disk.")
op, err := c.service.Disks.Delete(c.project, c.zone, c.diskName()).Do()
if err != nil {
return err
}
log.Infof("Waiting for disk to delete.")
return c.waitForRegionalOp(op.Name)
}
func (c *ComputeUtil) firewallRule() (*raw.Firewall, error) {
return c.service.Firewalls.Get(c.project, firewallRule).Do()
}
func (c *ComputeUtil) createFirewallRule() error {
log.Infof("Creating firewall rule.")
allowed := []*raw.FirewallAllowed{
{
IPProtocol: "tcp",
Ports: []string{
port,
},
},
}
if c.SwarmMaster {
u, err := url.Parse(c.SwarmHost)
if err != nil {
return fmt.Errorf("error authorizing port for swarm: %s", err)
}
parts := strings.Split(u.Host, ":")
swarmPort := parts[1]
allowed = append(allowed, &raw.FirewallAllowed{
IPProtocol: "tcp",
Ports: []string{
swarmPort,
},
})
}
rule := &raw.Firewall{
Allowed: allowed,
SourceRanges: []string{
"0.0.0.0/0",
},
TargetTags: []string{
firewallTargetTag,
},
Name: firewallRule,
}
op, err := c.service.Firewalls.Insert(c.project, rule).Do()
if err != nil {
return err
}
return c.waitForGlobalOp(op.Name)
}
// instance retrieves the instance.
func (c *ComputeUtil) instance() (*raw.Instance, error) {
return c.service.Instances.Get(c.project, c.zone, c.instanceName).Do()
}
// createInstance creates a GCE VM instance.
func (c *ComputeUtil) createInstance(d *Driver) error {
log.Infof("Creating instance.")
// The rule will either exist or be nil in case of an error.
if rule, _ := c.firewallRule(); rule == nil {
if err := c.createFirewallRule(); err != nil {
return err
}
}
instance := &raw.Instance{
Name: c.instanceName,
Description: "docker host vm",
MachineType: c.zoneURL + "/machineTypes/" + d.MachineType,
Disks: []*raw.AttachedDisk{
{
Boot: true,
AutoDelete: false,
Type: "PERSISTENT",
Mode: "READ_WRITE",
},
},
NetworkInterfaces: []*raw.NetworkInterface{
{
AccessConfigs: []*raw.AccessConfig{
{Type: "ONE_TO_ONE_NAT"},
},
Network: c.globalURL + "/networks/default",
},
},
Tags: &raw.Tags{
Items: []string{
firewallTargetTag,
},
},
ServiceAccounts: []*raw.ServiceAccount{
{
Email: "default",
Scopes: strings.Split(d.Scopes, ","),
},
},
}
disk, err := c.disk()
if disk == nil || err != nil {
instance.Disks[0].InitializeParams = &raw.AttachedDiskInitializeParams{
DiskName: c.diskName(),
SourceImage: imageName,
// The maximum supported disk size is 1000GB, the cast should be fine.
DiskSizeGb: int64(d.DiskSize),
}
} else {
instance.Disks[0].Source = c.zoneURL + "/disks/" + c.instanceName + "-disk"
}
op, err := c.service.Instances.Insert(c.project, c.zone, instance).Do()
if err != nil {
return err
}
log.Infof("Waiting for Instance...")
if err = c.waitForRegionalOp(op.Name); err != nil {
return err
}
instance, err = c.instance()
if err != nil {
return err
}
ip := instance.NetworkInterfaces[0].AccessConfigs[0].NatIP
c.waitForSSH(ip)
// Update the SSH Key
sshKey, err := ioutil.ReadFile(d.GetSSHKeyPath() + ".pub")
if err != nil {
return err
}
log.Infof("Uploading SSH Key")
op, err = c.service.Instances.SetMetadata(c.project, c.zone, c.instanceName, &raw.Metadata{
Fingerprint: instance.Metadata.Fingerprint,
Items: []*raw.MetadataItems{
{
Key: "sshKeys",
Value: c.userName + ":" + string(sshKey) + "\n",
},
},
}).Do()
if err != nil {
return err
}
log.Infof("Waiting for SSH Key")
err = c.waitForRegionalOp(op.Name)
if err != nil {
return err
}
return nil
}
// deleteInstance deletes the instance, leaving the persistent disk.
func (c *ComputeUtil) deleteInstance() error {
log.Infof("Deleting instance.")
op, err := c.service.Instances.Delete(c.project, c.zone, c.instanceName).Do()
if err != nil {
return err
}
log.Infof("Waiting for instance to delete.")
return c.waitForRegionalOp(op.Name)
}
func (c *ComputeUtil) executeCommands(commands []string, ip, sshKeyPath string) error {
for _, command := range commands {
cmd := ssh.GetSSHCommand(ip, 22, c.userName, sshKeyPath, command)
if err := cmd.Run(); err != nil {
return fmt.Errorf("error executing command: %v %v", command, err)
}
}
return nil
}
func (c *ComputeUtil) waitForOp(opGetter func() (*raw.Operation, error)) error {
for {
op, err := opGetter()
if err != nil {
return err
}
log.Debugf("operation %q status: %s", op.Name, op.Status)
if op.Status == "DONE" {
if op.Error != nil {
return fmt.Errorf("Operation error: %v", *op.Error.Errors[0])
}
break
}
time.Sleep(1 * time.Second)
}
return nil
}
// waitForOp waits for the GCE Operation to finish.
func (c *ComputeUtil) waitForRegionalOp(name string) error {
return c.waitForOp(func() (*raw.Operation, error) {
return c.service.ZoneOperations.Get(c.project, c.zone, name).Do()
})
}
func (c *ComputeUtil) waitForGlobalOp(name string) error {
return c.waitForOp(func() (*raw.Operation, error) {
return c.service.GlobalOperations.Get(c.project, name).Do()
})
}
// waitForSSH waits for SSH to become ready on the instance.
func (c *ComputeUtil) waitForSSH(ip string) error {
log.Infof("Waiting for SSH...")
return ssh.WaitForTCP(fmt.Sprintf("%s:22", ip))
}
// ip retrieves and returns the external IP address of the instance.
func (c *ComputeUtil) ip() (string, error) {
if c.ipAddress == "" {
instance, err := c.service.Instances.Get(c.project, c.zone, c.instanceName).Do()
if err != nil {
return "", err
}
c.ipAddress = instance.NetworkInterfaces[0].AccessConfigs[0].NatIP
}
return c.ipAddress, nil
}