/
Service.go
109 lines (90 loc) · 2.62 KB
/
Service.go
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package googlecloudstorage
import (
"cloud.google.com/go/storage"
"context"
"encoding/json"
"io/ioutil"
errortools "github.com/leapforce-libraries/go_errortools"
go_credentials "github.com/leapforce-libraries/go_google/credentials"
"google.golang.org/api/option"
)
const (
defaultTimestampLayout string = "2006-01-02 15:04:05"
BaseUrl string = "https://storage.googleapis.com"
)
type ServiceConfig struct {
CredentialsJson *go_credentials.CredentialsJson
DefaultBucketName *string
TimestampLayout *string
}
type Service struct {
storageClient *storage.Client
bucket *Bucket
context context.Context
timestampLayout string
}
func NewService(serviceConfig *ServiceConfig) (*Service, *errortools.Error) {
if serviceConfig.CredentialsJson == nil {
return nil, errortools.ErrorMessage("CredentialsJSON not provided")
}
credentialsByte, err := json.Marshal(&serviceConfig.CredentialsJson)
if err != nil {
return nil, errortools.ErrorMessage(err)
}
ctx := context.Background()
// init Google Cloud Storage client
storageClient, err := storage.NewClient(ctx, option.WithCredentialsJSON(credentialsByte))
if err != nil {
return nil, errortools.ErrorMessage(err)
}
timestampLayout := defaultTimestampLayout
if serviceConfig.TimestampLayout != nil {
timestampLayout = *serviceConfig.TimestampLayout
}
service := Service{
storageClient: storageClient,
bucket: nil,
context: ctx,
timestampLayout: timestampLayout,
}
if serviceConfig.DefaultBucketName != nil {
service.bucket = service.Bucket(*serviceConfig.DefaultBucketName)
}
return &service, nil
}
func (service *Service) Bucket(bucketName string) *Bucket {
bucketHandle := service.storageClient.Bucket(bucketName)
return &Bucket{
bucketName,
bucketHandle,
}
}
func (service *Service) read(objectHandle *storage.ObjectHandle, ctx context.Context) (*[]byte, bool, *errortools.Error) {
reader, err := objectHandle.NewReader(ctx)
if err == storage.ErrObjectNotExist {
//fmt.Println("file does not exist")
return nil, false, nil
}
if err != nil {
return nil, true, errortools.ErrorMessage(err)
}
b, err := ioutil.ReadAll(reader)
if err != nil {
return nil, true, errortools.ErrorMessage(err)
}
return &b, true, nil
}
func (service *Service) readObject(objectHandle *storage.ObjectHandle, ctx context.Context, model interface{}) (bool, *errortools.Error) {
b, exists, e := service.read(objectHandle, ctx)
if e != nil {
return exists, e
}
if !exists {
return exists, nil
}
err := json.Unmarshal(*b, model)
if err != nil {
return true, errortools.ErrorMessage(err)
}
return true, nil
}