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gcp.go
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gcp.go
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package state
import (
"context"
"encoding/json"
"fmt"
"io/ioutil"
"strconv"
"strings"
"time"
"cloud.google.com/go/storage"
"github.com/camptocamp/terraboard/config"
"github.com/hashicorp/terraform/states/statefile"
log "github.com/sirupsen/logrus"
"google.golang.org/api/iterator"
"google.golang.org/api/option"
)
// GCP is a state provider type, leveraging GCS
type GCP struct {
svc *storage.Client
buckets []string
}
// NewGCP creates an GCP object
func NewGCP(c *config.Config) ([]*GCP, error) {
ctx := context.Background()
var client *storage.Client
var gcpInstances []*GCP
var err error
for _, gcp := range c.GCP {
if gcp.GCSBuckets != nil {
if gcp.GCPSAKey != "" {
log.WithFields(log.Fields{
"path": gcp.GCPSAKey,
}).Info("Authenticating using service account key")
opt := option.WithCredentialsFile(gcp.GCPSAKey)
client, err = storage.NewClient(ctx, opt) // Use service account key
} else {
client, err = storage.NewClient(ctx) // Use base credentials
}
if err != nil {
log.Fatalf("Failed to create client: %v", err)
return nil, err
}
instance := &GCP{
svc: client,
buckets: gcp.GCSBuckets,
}
gcpInstances = append(gcpInstances, instance)
log.WithFields(log.Fields{
"buckets": gcp.GCSBuckets,
}).Info("Client successfully created")
}
}
return gcpInstances, nil
}
// GetLocks returns a map of locks by State path
func (a *GCP) GetLocks() (locks map[string]LockInfo, err error) {
ctx := context.Background()
ctx, cancel := context.WithTimeout(ctx, time.Second*60)
defer cancel()
var lockFiles []string
for _, bucketName := range a.buckets {
it := a.svc.Bucket(bucketName).Objects(ctx, nil)
for {
attrs, err := it.Next()
if err == iterator.Done {
break
}
if err != nil {
return nil, err
}
if strings.HasSuffix(attrs.Name, ".tflock") {
lockFiles = append(lockFiles, attrs.Name)
}
}
locks = make(map[string]LockInfo)
for _, lockFile := range lockFiles {
ctx, cancel := context.WithTimeout(ctx, time.Second*50)
defer cancel()
rc, err := a.svc.Bucket(bucketName).Object(lockFile).NewReader(ctx)
if err != nil {
return nil, err
}
defer rc.Close()
data, err := ioutil.ReadAll(rc)
if err != nil {
return nil, err
}
var info LockInfo
err = json.Unmarshal([]byte(data), &info)
if err != nil {
return nil, err
}
locks[strings.Join([]string{bucketName, lockFile}, "/")] = info
}
}
return locks, nil
}
// GetStates returns a slice of State files in the GCS bucket
func (a *GCP) GetStates() (states []string, err error) {
ctx := context.Background()
ctx, cancel := context.WithTimeout(ctx, time.Second*60)
defer cancel()
var stateFiles []string
for _, bucketName := range a.buckets {
it := a.svc.Bucket(bucketName).Objects(ctx, nil)
for {
attrs, err := it.Next()
if err == iterator.Done {
break
}
if err != nil {
return nil, err
}
if strings.HasSuffix(attrs.Name, ".tfstate") {
stateFiles = append(stateFiles, strings.Join([]string{bucketName, attrs.Name}, "/"))
}
}
}
return stateFiles, nil
}
// GetState retrieves a single State from the GCS bucket
func (a *GCP) GetState(st, versionID string) (sf *statefile.File, err error) {
ctx := context.Background()
ctx, cancel := context.WithTimeout(ctx, time.Second*60)
defer cancel()
bucketSplit := strings.Index(st, "/")
bucketName := st[0:bucketSplit]
fileName := st[bucketSplit+1:]
obj := a.svc.Bucket(bucketName).Object(fileName)
if versionID != "" {
version, err := strconv.ParseInt(versionID, 10, 64)
if err != nil {
return nil, err
}
obj = obj.Generation(version)
}
rc, err := obj.NewReader(ctx)
if err != nil {
log.WithFields(log.Fields{
"path": st,
"version_id": versionID,
"error": err,
}).Error("Error retrieving state from GCS")
errObj := make(map[string]string)
errObj["error"] = fmt.Sprintf("State file not found: %v", st)
errObj["details"] = fmt.Sprintf("%v", err)
j, _ := json.Marshal(errObj)
return sf, fmt.Errorf("%s", string(j))
}
defer rc.Close()
sf, err = statefile.Read(rc)
if sf == nil {
return sf, fmt.Errorf("Failed to find state")
}
log.WithFields(log.Fields{
"path": st,
"version_id": versionID,
}).Info("State read from GCS")
return
}
// GetVersions returns a slice of Version objects
func (a *GCP) GetVersions(state string) (versions []Version, err error) {
versions = []Version{}
ctx := context.Background()
ctx, cancel := context.WithTimeout(ctx, time.Second*60)
defer cancel()
bucketSplit := strings.Index(state, "/")
bucketName := state[0:bucketSplit]
fileName := state[bucketSplit+1:]
q := storage.Query{
Versions: true,
Prefix: fileName,
}
it := a.svc.Bucket(bucketName).Objects(ctx, &q)
for {
attrs, err := it.Next()
if err == iterator.Done {
break
}
if err != nil {
return nil, err
}
if attrs.Name == fileName {
tm := attrs.Updated
versions = append(versions, Version{
ID: strconv.FormatInt(attrs.Generation, 10),
LastModified: tm,
})
}
}
return
}