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gcs.go
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gcs.go
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package driver
import (
"context"
"fmt"
"io"
"io/ioutil"
"os"
"cloud.google.com/go/storage"
"github.com/blang/semver"
"github.com/concourse/semver-resource/version"
"google.golang.org/api/option"
)
type GCSDriver struct {
InitialVersion semver.Version
Servicer IOServicer
BucketName string
Key string
}
func (d *GCSDriver) Bump(b version.Bump) (semver.Version, error) {
versions, err := d.Check(nil)
if err != nil {
return semver.Version{}, err
}
if len(versions) == 0 {
return semver.Version{}, nil
}
newVersion := b.Apply(versions[0])
err = d.Set(newVersion)
if err != nil {
return semver.Version{}, err
}
return newVersion, nil
}
func (d *GCSDriver) Set(v semver.Version) error {
w, err := d.Servicer.PutObject(d.BucketName, d.Key)
if err != nil {
return err
}
defer w.Close()
_, err = w.Write([]byte(v.String()))
return err
}
func (d *GCSDriver) Check(cursor *semver.Version) ([]semver.Version, error) {
r, err := d.Servicer.GetObject(d.BucketName, d.Key)
switch err {
case storage.ErrObjectNotExist:
if cursor == nil {
return []semver.Version{d.InitialVersion}, nil
}
return []semver.Version{}, nil
case nil:
default:
return nil, err
}
defer r.Close()
b, err := ioutil.ReadAll(r)
if err != nil {
return nil, err
}
v, err := semver.Parse(string(b))
if err != nil {
return nil, fmt.Errorf("parsing number in bucket: %s", err)
}
if cursor == nil || v.GTE(*cursor) {
return []semver.Version{v}, nil
}
return nil, nil
}
type IOServicer interface {
GetObject(bucketName, objectName string) (io.ReadCloser, error)
PutObject(bucketName, objectName string) (io.WriteCloser, error)
}
type GCSIOServicer struct {
JSONCredentials string
}
func (s *GCSIOServicer) GetObject(bucketName, objectName string) (io.ReadCloser, error) {
temp, err := ioutil.TempFile("", "auth-credentials.json")
if err != nil {
return nil, err
}
_, err = temp.WriteString(s.JSONCredentials)
if err != nil {
return nil, err
}
defer os.Remove(temp.Name())
ctx := context.Background()
authOption := option.WithCredentialsFile(temp.Name())
client, err := storage.NewClient(ctx, authOption)
if err != nil {
return nil, err
}
bkt := client.Bucket(bucketName)
obj := bkt.Object(objectName)
return obj.NewReader(context.Background())
}
func (s *GCSIOServicer) PutObject(bucketName, objectName string) (io.WriteCloser, error) {
temp, err := ioutil.TempFile("", "auth-credentials.json")
if err != nil {
return nil, err
}
_, err = temp.WriteString(s.JSONCredentials)
if err != nil {
return nil, err
}
defer os.Remove(temp.Name())
ctx := context.Background()
authOption := option.WithCredentialsFile(temp.Name())
client, err := storage.NewClient(ctx, authOption)
if err != nil {
return nil, err
}
bkt := client.Bucket(bucketName)
obj := bkt.Object(objectName)
return obj.NewWriter(context.Background()), nil
}