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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/http"
"net/url"
"regexp"
"strings"
"time"
"github.com/docker/machine/drivers/driverutil"
"github.com/docker/machine/libmachine/log"
raw "google.golang.org/api/compute/v1"
"errors"
"golang.org/x/oauth2"
"golang.org/x/oauth2/google"
"google.golang.org/api/googleapi"
)
// 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
diskTypeURL string
address string
network string
subnetwork string
preemptible bool
useInternalIP bool
useInternalIPOnly bool
service *raw.Service
zoneURL string
globalURL string
SwarmMaster bool
SwarmHost string
openPorts []string
}
const (
apiURL = "https://www.googleapis.com/compute/v1/projects/"
firewallRule = "docker-machines"
dockerPort = "2376"
firewallTargetTag = "docker-machine"
)
// NewComputeUtil creates and initializes a ComputeUtil.
func newComputeUtil(driver *Driver) (*ComputeUtil, error) {
client, err := google.DefaultClient(oauth2.NoContext, raw.ComputeScope)
if err != nil {
return nil, err
}
service, err := raw.New(client)
if err != nil {
return nil, err
}
return &ComputeUtil{
zone: driver.Zone,
instanceName: driver.MachineName,
userName: driver.SSHUser,
project: driver.Project,
diskTypeURL: driver.DiskType,
address: driver.Address,
network: driver.Network,
subnetwork: driver.Subnetwork,
preemptible: driver.Preemptible,
useInternalIP: driver.UseInternalIP,
useInternalIPOnly: driver.UseInternalIPOnly,
service: service,
zoneURL: apiURL + driver.Project + "/zones/" + driver.Zone,
globalURL: apiURL + driver.Project + "/global",
SwarmMaster: driver.SwarmMaster,
SwarmHost: driver.SwarmHost,
openPorts: driver.OpenPorts,
}, nil
}
func (c *ComputeUtil) diskName() string {
return c.instanceName + "-disk"
}
func (c *ComputeUtil) diskType() string {
return apiURL + c.project + "/zones/" + c.zone + "/diskTypes/" + c.diskTypeURL
}
// disk returns the persistent disk attached to the vm.
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 {
disk, _ := c.disk()
if disk == nil {
return nil
}
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)
}
// staticAddress returns the external static IP address.
func (c *ComputeUtil) staticAddress() (string, error) {
// is the address a name?
isName, err := regexp.MatchString("[a-z]([-a-z0-9]*[a-z0-9])?", c.address)
if err != nil {
return "", err
}
if !isName {
return c.address, nil
}
// resolve the address by name
externalAddress, err := c.service.Addresses.Get(c.project, c.region(), c.address).Do()
if err != nil {
return "", err
}
return externalAddress.Address, nil
}
func (c *ComputeUtil) region() string {
return c.zone[:len(c.zone)-2]
}
func (c *ComputeUtil) firewallRule() (*raw.Firewall, error) {
return c.service.Firewalls.Get(c.project, firewallRule).Do()
}
func missingOpenedPorts(rule *raw.Firewall, ports []string) map[string][]string {
missing := map[string][]string{}
opened := map[string]bool{}
for _, allowed := range rule.Allowed {
for _, allowedPort := range allowed.Ports {
opened[allowedPort+"/"+allowed.IPProtocol] = true
}
}
for _, p := range ports {
port, proto := driverutil.SplitPortProto(p)
if !opened[port+"/"+proto] {
missing[proto] = append(missing[proto], port)
}
}
return missing
}
func (c *ComputeUtil) portsUsed() ([]string, error) {
ports := []string{dockerPort + "/tcp"}
if c.SwarmMaster {
u, err := url.Parse(c.SwarmHost)
if err != nil {
return nil, fmt.Errorf("error authorizing port for swarm: %s", err)
}
swarmPort := strings.Split(u.Host, ":")[1]
ports = append(ports, swarmPort+"/tcp")
}
for _, p := range c.openPorts {
port, proto := driverutil.SplitPortProto(p)
ports = append(ports, port+"/"+proto)
}
return ports, nil
}
// openFirewallPorts configures the firewall to open docker and swarm ports.
func (c *ComputeUtil) openFirewallPorts(d *Driver) error {
log.Infof("Opening firewall ports")
create := false
rule, _ := c.firewallRule()
if rule == nil {
create = true
rule = &raw.Firewall{
Name: firewallRule,
Allowed: []*raw.FirewallAllowed{},
SourceRanges: []string{"0.0.0.0/0"},
TargetTags: []string{firewallTargetTag},
Network: c.globalURL + "/networks/" + d.Network,
}
}
portsUsed, err := c.portsUsed()
if err != nil {
return err
}
missingPorts := missingOpenedPorts(rule, portsUsed)
if len(missingPorts) == 0 {
return nil
}
for proto, ports := range missingPorts {
rule.Allowed = append(rule.Allowed, &raw.FirewallAllowed{
IPProtocol: proto,
Ports: ports,
})
}
var op *raw.Operation
if create {
op, err = c.service.Firewalls.Insert(c.project, rule).Do()
} else {
op, err = c.service.Firewalls.Update(c.project, firewallRule, 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")
var net string
if strings.Contains(d.Network, "/networks/") {
net = d.Network
} else {
net = c.globalURL + "/networks/" + d.Network
}
instance := &raw.Instance{
Name: c.instanceName,
Description: "docker host vm",
MachineType: c.zoneURL + "/machineTypes/" + d.MachineType,
Disks: []*raw.AttachedDisk{
{
Boot: true,
AutoDelete: true,
Type: "PERSISTENT",
Mode: "READ_WRITE",
},
},
NetworkInterfaces: []*raw.NetworkInterface{
{
Network: net,
},
},
Tags: &raw.Tags{
Items: parseTags(d),
},
ServiceAccounts: []*raw.ServiceAccount{
{
Email: "default",
Scopes: strings.Split(d.Scopes, ","),
},
},
Scheduling: &raw.Scheduling{
Preemptible: c.preemptible,
},
}
if strings.Contains(c.subnetwork, "/subnetworks/") {
instance.NetworkInterfaces[0].Subnetwork = c.subnetwork
} else if c.subnetwork != "" {
instance.NetworkInterfaces[0].Subnetwork = "projects/" + c.project + "/regions/" + c.region() + "/subnetworks/" + c.subnetwork
}
if !c.useInternalIPOnly {
cfg := &raw.AccessConfig{
Type: "ONE_TO_ONE_NAT",
}
instance.NetworkInterfaces[0].AccessConfigs = append(instance.NetworkInterfaces[0].AccessConfigs, cfg)
}
if c.address != "" {
staticAddress, err := c.staticAddress()
if err != nil {
return err
}
instance.NetworkInterfaces[0].AccessConfigs[0].NatIP = staticAddress
}
disk, err := c.disk()
if disk == nil || err != nil {
instance.Disks[0].InitializeParams = &raw.AttachedDiskInitializeParams{
DiskName: c.diskName(),
SourceImage: "https://www.googleapis.com/compute/v1/projects/" + d.MachineImage,
// The maximum supported disk size is 1000GB, the cast should be fine.
DiskSizeGb: int64(d.DiskSize),
DiskType: c.diskType(),
}
} 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
}
return c.uploadSSHKey(instance, d.GetSSHKeyPath())
}
// configureInstance configures an existing instance for use with Docker Machine.
func (c *ComputeUtil) configureInstance(d *Driver) error {
log.Infof("Configuring instance")
instance, err := c.instance()
if err != nil {
return err
}
if err := c.addFirewallTag(instance); err != nil {
return err
}
return c.uploadSSHKey(instance, d.GetSSHKeyPath())
}
// addFirewallTag adds a tag to the instance to match the firewall rule.
func (c *ComputeUtil) addFirewallTag(instance *raw.Instance) error {
log.Infof("Adding tag for the firewall rule")
tags := instance.Tags
for _, tag := range tags.Items {
if tag == firewallTargetTag {
return nil
}
}
tags.Items = append(tags.Items, firewallTargetTag)
op, err := c.service.Instances.SetTags(c.project, c.zone, instance.Name, tags).Do()
if err != nil {
return err
}
return c.waitForRegionalOp(op.Name)
}
// uploadSSHKey updates the instance metadata with the given ssh key.
func (c *ComputeUtil) uploadSSHKey(instance *raw.Instance, sshKeyPath string) error {
log.Infof("Uploading SSH Key")
sshKey, err := ioutil.ReadFile(sshKeyPath + ".pub")
if err != nil {
return err
}
metaDataValue := fmt.Sprintf("%s:%s %s\n", c.userName, strings.TrimSpace(string(sshKey)), c.userName)
op, err := c.service.Instances.SetMetadata(c.project, c.zone, c.instanceName, &raw.Metadata{
Fingerprint: instance.Metadata.Fingerprint,
Items: []*raw.MetadataItems{
{
Key: "sshKeys",
Value: &metaDataValue,
},
},
}).Do()
return c.waitForRegionalOp(op.Name)
}
// parseTags computes the tags for the instance.
func parseTags(d *Driver) []string {
tags := []string{firewallTargetTag}
if d.Tags != "" {
tags = append(tags, strings.Split(d.Tags, ",")...)
}
return tags
}
// 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)
}
// stopInstance stops the instance.
func (c *ComputeUtil) stopInstance() error {
op, err := c.service.Instances.Stop(c.project, c.zone, c.instanceName).Do()
if err != nil {
return err
}
log.Infof("Waiting for instance to stop.")
return c.waitForRegionalOp(op.Name)
}
// startInstance starts the instance.
func (c *ComputeUtil) startInstance() error {
op, err := c.service.Instances.Start(c.project, c.zone, c.instanceName).Do()
if err != nil {
return err
}
log.Infof("Waiting for instance to start.")
return c.waitForRegionalOp(op.Name)
}
// waitForOp waits for the operation to finish.
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
}
// waitForRegionalOp waits for the regional 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()
})
}
// waitForGlobalOp waits for the global operation to finish.
func (c *ComputeUtil) waitForGlobalOp(name string) error {
return c.waitForOp(func() (*raw.Operation, error) {
return c.service.GlobalOperations.Get(c.project, name).Do()
})
}
// ip retrieves and returns the external IP address of the instance.
func (c *ComputeUtil) ip() (string, error) {
instance, err := c.service.Instances.Get(c.project, c.zone, c.instanceName).Do()
if err != nil {
return "", unwrapGoogleError(err)
}
nic := instance.NetworkInterfaces[0]
if c.useInternalIP {
return nic.NetworkIP, nil
}
return nic.AccessConfigs[0].NatIP, nil
}
func unwrapGoogleError(err error) error {
if googleErr, ok := err.(*googleapi.Error); ok {
return errors.New(googleErr.Message)
}
return err
}
func isNotFound(err error) bool {
googleErr, ok := err.(*googleapi.Error)
if !ok {
return false
}
if googleErr.Code == http.StatusNotFound {
return true
}
return false
}