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gcs.go
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gcs.go
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package gcs
import (
"context"
"encoding/json"
"net/http"
"path"
"strings"
"cloud.google.com/go/storage"
"github.com/googleapis/google-cloud-go-testing/storage/stiface"
"github.com/labstack/echo/v4"
"github.com/labstack/gommon/log"
"google.golang.org/api/iterator"
"google.golang.org/api/option"
"github.com/apiobuild/blobkv/config"
"github.com/apiobuild/blobkv/model"
)
// Custom Errors
var (
ObjectDoesNotExistsError = echo.NewHTTPError(http.StatusNotFound, "Object Does Not Exists")
)
func getLogJSON(message string, err error) (json log.JSON) {
json = log.JSON{
"message": message,
}
if err != nil {
json["error"] = err.Error()
}
return
}
// I ...
type I struct {
Client stiface.Client
Config config.Storage
Bucket stiface.BucketHandle
}
// NewClient ...
func NewClient(conf config.Storage) (i I, err error) {
var (
client *storage.Client
)
ctx := context.Background()
if client, err = storage.NewClient(
ctx, option.WithCredentialsFile(conf.Creds),
); err != nil {
return
}
i = I{
Client: stiface.AdaptClient(client),
Config: conf,
}
// NOTE: need to instantiate client first
i.Bucket = i.Client.Bucket(conf.Bucket)
return
}
func (i I) getObject(key string) (object stiface.ObjectHandle) {
return i.Bucket.Object(path.Join(i.Config.Prefix, key))
}
// Exists ...
func (i I) Exists(key string) (err error) {
ctx := context.Background()
if _, err = i.getObject(key).Attrs(ctx); err != nil {
if err.Error() == "storage: object doesn't exist" {
log.Warnj(
getLogJSON("Object doesn't exist", err),
)
err = ObjectDoesNotExistsError
return
}
}
return
}
// Add add deploy stack metadata if not exist
func (i I) Add(key string, payload model.Payload, metadata *model.Metadata) (err error) {
return i.add(key, payload, metadata, false)
}
func (i I) add(key string, payload model.Payload, metadata *model.Metadata, force bool) (err error) {
ctx := context.Background()
if !force {
// if not force add, check if exist first
if existsErr := i.Exists(key); existsErr == nil {
log.Warnj(getLogJSON("Object exists, do noting", nil))
return
}
}
// otherwise write whether exist or not
w := i.getObject(key).NewWriter(ctx)
if metadata != nil {
w.Attrs().Metadata = *metadata
}
w.ObjectAttrs().ContentType = "application/json"
w.ObjectAttrs().CacheControl = "no-cache,max-age=0"
defer w.Close()
var b []byte
if b, err = json.Marshal(payload); err != nil {
return
}
if _, err = w.Write(b); err != nil {
log.Warnj(log.JSON{
"Message": "Error writting deployment stack",
"Error": err.Error(),
})
return
}
return
}
// ForceAdd add deploy stack metadata exist or not
func (i I) ForceAdd(key string, payload model.Payload, metadata *model.Metadata) (err error) {
return i.add(key, payload, metadata, true)
}
// List ...
func (i I) List(key string) (keys model.Keys, err error) {
ctx := context.Background()
it := i.Bucket.Objects(ctx, &storage.Query{
Prefix: path.Join(i.Config.Prefix, key) + "/",
Delimiter: "/",
})
for {
attrs, err1 := it.Next()
if err1 == iterator.Done {
break
}
if err1 != nil {
err = err1
return
}
prefix := attrs.Prefix
prefix = strings.TrimPrefix(prefix, i.Config.Prefix)
prefix = strings.TrimPrefix(prefix, "/"+key)
prefix = strings.Trim(prefix, "/")
keys = append(keys, model.Key{
Key: prefix,
Metadata: attrs.Metadata,
})
}
return
}
// Get ...
func (i I) Get(key string) (payload model.Payload, err error) {
if err = i.Exists(key); err != nil {
log.Errorj(getLogJSON("Object doesn't exists", err))
return
}
ctx := context.Background()
r, err := i.getObject(key).NewReader(ctx)
if err != nil {
log.Errorj(getLogJSON("Error getting object", err))
return
}
defer r.Close()
err = json.NewDecoder(r).Decode(&payload)
if err != nil {
log.Errorj(getLogJSON("Error decoding object", err))
return
}
return
}
// Update ...
func (i I) Update(key string, payload model.Payload, metadata *model.Metadata) (err error) {
if err = i.Exists(key); err != nil {
log.Errorj(getLogJSON("Object doesn't exists", err))
return
}
return i.add(key, payload, metadata, true)
}
// Delete ...
func (i I) Delete(key string) (err error) {
ctx := context.Background()
if err = i.Exists(key); err != nil {
log.Errorj(getLogJSON("Object doesn't exists", err))
return
}
err = i.getObject(key).Delete(ctx)
if err != nil {
return
}
return
}