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infra.go
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infra.go
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package infra
import (
"context"
"encoding/json"
"errors"
"fmt"
"log"
"math/rand"
"net/http"
"sync"
"time"
"golang.org/x/oauth2/google"
"google.golang.org/api/compute/v1"
"google.golang.org/api/dns/v1"
"google.golang.org/api/storage/v1"
)
var defaultGCEScopes = []string{storage.CloudPlatformScope}
type Client struct {
computeSrvc *compute.Service
dnsSrvc *dns.Service
storageSrvc *storage.Service
}
func NewWithHTTPClient(hc *http.Client) (*Client, error) {
computeSrvc, err := compute.New(hc)
if err != nil {
return nil, err
}
dnsSrvc, err := dns.New(hc)
if err != nil {
return nil, err
}
storageSrvc, err := storage.New(hc)
if err != nil {
return nil, err
}
c := &Client{
computeSrvc: computeSrvc,
dnsSrvc: dnsSrvc,
storageSrvc: storageSrvc,
}
return c, nil
}
func NewDefaultClient(ctx context.Context, scopes ...string) (*Client, error) {
if len(scopes) == 0 {
scopes = defaultGCEScopes[:]
}
httpClient, err := google.DefaultClient(ctx, scopes...)
if err != nil {
return nil, err
}
return NewWithHTTPClient(httpClient)
}
func (c *Client) zonesService() *compute.ZonesService {
return compute.NewZonesService(c.computeSrvc)
}
func (c *Client) instancesService() *compute.InstancesService {
return compute.NewInstancesService(c.computeSrvc)
}
type ZonePage struct {
Err error
PageNumber int64 `json:"page_number"`
Zones []*compute.Zone `json:"zones,omitempty"`
}
type ZoneRequest struct {
Project string `json:"project"`
OrderBy string `json:"order_by"`
Filter string `json:"filter"`
MaxPages int64 `json:"max_pages"`
ResultsPerPage int64 `json:"results_per_page"`
}
type ZonePagesResponse struct {
Pages <-chan *ZonePage
Cancel func() error
}
type InstancePage struct {
Err error
PageNumber int64 `json:"page_number"`
Instances []*compute.Instance `json:"instances,omitempty"`
}
type InstancePagesResponse struct {
Pages <-chan *InstancePage
Cancel func() error
}
func makeCanceler() (<-chan bool, func() error) {
var cancelOnce sync.Once
cancelChan := make(chan bool, 1)
cancel := func() error {
var err error
cancelOnce.Do(func() {
close(cancelChan)
})
return err
}
return cancelChan, cancel
}
var (
errBlankProject = errors.New("expecting a non-blank project")
errBlankZone = errors.New("expecting a non-blank zone")
errEmptyInstanceID = errors.New("expecting a non-empty instanceID")
errEmptyProject = errors.New("expecting a non-empty project")
errEmptyZone = errors.New("expecting a non-empty zone")
errBlankName = errors.New("expecting a non-blank name")
errUnimplemented = errors.New("unimplemented")
errEmptyNetworkInterface = errors.New("expecting a non-blank network interface")
)
func (zreq *ZoneRequest) Validate() error {
if zreq == nil || zreq.Project == "" {
return errBlankProject
}
return nil
}
type InstancesRequest struct {
Project string `json:"project"`
OrderBy string `json:"order_by"`
Filter string `json:"filter"`
MaxPages int64 `json:"max_pages"`
ResultsPerPage int64 `json:"results_per_page"`
Zone string `json:"zone"`
}
func (ireq *InstancesRequest) Validate() error {
if ireq == nil || ireq.Zone == "" {
return errBlankZone
}
if ireq.Project == "" {
return errBlankProject
}
return nil
}
func (c *Client) ListInstances(ctx context.Context, req *InstancesRequest) (*InstancePagesResponse, error) {
if err := req.Validate(); err != nil {
return nil, err
}
maxPageNumber := req.MaxPages
pageExceedsMax := func(pageNumber int64) bool {
if maxPageNumber <= 0 {
return false
}
return pageNumber > maxPageNumber
}
maxResultsPerPage := int64(40)
if req.ResultsPerPage > 0 {
maxResultsPerPage = req.ResultsPerPage
}
cancelChan, cancelFn := makeCanceler()
pagesChan := make(chan *InstancePage)
go func() {
defer close(pagesChan)
ilc := c.instancesService().List(req.Project, req.Zone).Context(ctx)
ilc.MaxResults(maxResultsPerPage)
if req.Filter != "" {
ilc.Filter(req.Filter)
}
if req.OrderBy != "" {
ilc.OrderBy(req.OrderBy)
}
pageToken := ""
pageNumber := int64(0)
throttleDuration := time.Duration(350 * time.Millisecond)
for {
ilc.PageToken(pageToken)
ipage := new(InstancePage)
ipage.PageNumber = pageNumber
ilr, err := ilc.Do()
if err != nil {
ipage.Err = err
pagesChan <- ipage
return
}
ipage.Instances = ilr.Items
pagesChan <- ipage
pageNumber += 1
if pageExceedsMax(pageNumber) {
return
}
pageToken := ilr.NextPageToken
select {
case <-cancelChan:
return
case <-time.After(throttleDuration):
}
if pageToken == "" {
// No more results left
break
}
}
}()
ires := &InstancePagesResponse{
Pages: pagesChan,
Cancel: cancelFn,
}
return ires, nil
}
func (c *Client) ListZones(ctx context.Context, req *ZoneRequest) (*ZonePagesResponse, error) {
if err := req.Validate(); err != nil {
return nil, err
}
maxPageNumber := req.MaxPages
pageExceedsMax := func(pageNumber int64) bool {
if maxPageNumber <= 0 {
return false
}
return pageNumber > maxPageNumber
}
maxResultsPerPage := int64(40)
if req.ResultsPerPage > 0 {
maxResultsPerPage = req.ResultsPerPage
}
cancelChan, cancelFn := makeCanceler()
pagesChan := make(chan *ZonePage)
go func() {
defer close(pagesChan)
zlc := c.zonesService().List(req.Project).Context(ctx)
zlc.MaxResults(maxResultsPerPage)
if req.Filter != "" {
zlc.Filter(req.Filter)
}
if req.OrderBy != "" {
zlc.OrderBy(req.OrderBy)
}
pageToken := ""
pageNumber := int64(0)
throttleDuration := time.Duration(350 * time.Millisecond)
for {
zlc.PageToken(pageToken)
zpage := new(ZonePage)
zpage.PageNumber = pageNumber
zlr, err := zlc.Do()
if err != nil {
zpage.Err = err
pagesChan <- zpage
return
}
zpage.Zones = zlr.Items
pagesChan <- zpage
pageNumber += 1
if pageExceedsMax(pageNumber) {
return
}
pageToken := zlr.NextPageToken
select {
case <-cancelChan:
return
case <-time.After(throttleDuration):
}
if pageToken == "" {
// No more results left
break
}
}
}()
zres := &ZonePagesResponse{
Pages: pagesChan,
Cancel: cancelFn,
}
return zres, nil
}
type InstanceRequest struct {
Zone string `json:"zone,omitempty"`
Project string `json:"project,omitempty"`
Description string `json:"description,omitempty"`
Name string `json:"name,omitempty"`
MachineType *MachineType `json:"machine_type,omitempty"`
// CanForwardIP allows an instance to send and receive packets with
// non-matching destination or source IPs. It is required if you
// plan to use the instance to forward routes.
// Description obtained from:
// https://godoc.org/pkg/google.golang.org/api/compute/v1/#Instance.CanIpForward
CanForwardIP bool `json:"can_forward_ip,omitempty"`
Disks []*compute.AttachedDisk `json:"attached_disks,omitempty"`
// NetworkInterface specifies how this interface is configured to interact with
// other network services, such as connecting to the internet.
// Description obtained from:
// https://godoc.org/google.golang.org/api/compute/v1#Instance.NetworkInterfaces
NetworkInterface *compute.NetworkInterface `json:"network_interface"`
// The metadata key/value pairs assigned to the instance.
// This includes custom metadata and predefined keys.
// Description obtained from:
// https://godoc.org/google.golang.org/api/compute/v1#Instance.Metadata
Metadata *compute.Metadata `json:"metadata"`
// ServiceAccounts: A list of service accounts, with their specified
// scopes, authorized for this instance. Only one service account per VM
// instance is supported.
//
// Service accounts generate access tokens that can be accessed through
// the metadata server and used to authenticate applications on the
// instance. See Service Accounts for more information.
// Description obtained from:
// https://godoc.org/google.golang.org/api/compute/v1#Instance.ServiceAccounts
ServiceAccounts []*compute.ServiceAccount `json:"service_accounts,omitempty"`
// NullFields is a list of field names (e.g. "CanIpForward") to include
// in API requests with the JSON null value. By default, fields with
// empty values are omitted from API requests. However, any field with
// an empty field appearing in NullFields will be sent to the server as
// null. It is an error if a field in this list has a non-empty value.
// This may be used to include null fields in PATCH requests.
// Description obtained from:
// https://godoc.org/google.golang.org/api/compute/v1#Instance.NullFields
NullFields []string `json:"null_fields"`
// BlockUntilCompletion when set signifies that the instance request
// should wait until full completion of creation of an instance.
BlockUntilCompletion bool `json:"block_until_completion"`
}
func (ireq *InstanceRequest) toInstance() *compute.Instance {
return &compute.Instance{
Name: ireq.Name,
Disks: ireq.disksOrDefault(),
Metadata: ireq.Metadata,
Description: ireq.Description,
MachineType: ireq.machineTypeOrDefault().partialURLByZone(ireq.Zone),
ServiceAccounts: ireq.ServiceAccounts[:],
NetworkInterfaces: []*compute.NetworkInterface{ireq.NetworkInterface},
}
}
func (ireq *InstanceRequest) disksOrDefault() []*compute.AttachedDisk {
if len(ireq.Disks) > 0 {
return ireq.Disks
}
return []*compute.AttachedDisk{
BasicAttachedDisk,
}
}
func (ireq *InstanceRequest) validateBasic() error {
if ireq == nil || ireq.Project == "" {
return errEmptyProject
}
if ireq.Zone == "" {
return errEmptyZone
}
if ireq.Name == "" {
return errBlankName
}
return nil
}
func (ireq *InstanceRequest) validateForCreate() error {
if err := ireq.validateBasic(); err != nil {
return err
}
if ireq.NetworkInterface == nil {
return errEmptyNetworkInterface
}
return ireq.machineTypeOrDefault().Validate()
}
func (ireq *InstanceRequest) machineTypeOrDefault() *MachineType {
if ireq.MachineType == nil {
return basic1VCPUMachine
}
return ireq.MachineType
}
func (ireq *InstanceRequest) validateForByName() error {
return ireq.validateBasic()
}
func (c *Client) FindInstance(ctx context.Context, ireq *InstanceRequest) (*compute.Instance, error) {
if err := ireq.validateForByName(); err != nil {
return nil, err
}
req := c.instancesService().Get(ireq.Project, ireq.Zone, ireq.Name)
return req.Context(ctx).Do()
}
func (c *Client) CreateInstance(ctx context.Context, ireq *InstanceRequest) (*compute.Instance, error) {
if err := ireq.validateForCreate(); err != nil {
return nil, err
}
req := c.instancesService().Insert(ireq.Project, ireq.Zone, ireq.toInstance())
operation, err := req.Context(ctx).Do()
log.Printf("op: %+v err: %v\n", operation, err)
if err != nil {
return nil, err
}
// Now check for any errors returned in operations.
if err := operation.Error; err != nil {
if anErr, ok := interface{}(err).(error); ok {
return nil, anErr
} else {
jsonBlob, _ := json.Marshal(err)
return nil, fmt.Errorf("%s", jsonBlob)
}
}
var instance *compute.Instance
// Then look up the instance by ID since an
// operation just returns the ID of the item created.
for i := 0; i < 10; i++ {
instance, err = c.FindInstance(ctx, &InstanceRequest{
Name: ireq.Name,
Zone: ireq.Zone,
Project: ireq.Project,
BlockUntilCompletion: ireq.BlockUntilCompletion,
})
if err == nil {
ipv4Addresses := ipv4AddressesFromInstance(instance)
if len(ipv4Addresses) > 0 {
// Ready to return
return instance, nil
}
}
<-time.After(time.Duration(rand.Intn(4+i)) * time.Second)
}
return instance, err
}