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gcs.go
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gcs.go
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package gcs
import (
"context"
_ "embed"
"encoding/base64"
"fmt"
"net/url"
"time"
"github.com/MakeNowJust/heredoc"
"github.com/pkg/errors"
"github.com/raystack/meteor/models"
assetsv1beta2 "github.com/raystack/meteor/models/raystack/assets/v1beta2"
"github.com/raystack/meteor/plugins"
"github.com/raystack/meteor/plugins/sinks/gcs/client"
"github.com/raystack/meteor/registry"
"github.com/raystack/salt/log"
)
//go:embed README.md
var summary string
type Config struct {
ProjectID string `mapstructure:"project_id" validate:"required"`
URL string `mapstructure:"url" validate:"required"`
ObjectPrefix string `mapstructure:"object_prefix"`
ServiceAccountJSON string `mapstructure:"service_account_json"`
ServiceAccountBase64 string `mapstructure:"service_account_base64"`
}
var info = plugins.Info{
Description: "saves data in google cloud storage bucket",
Summary: summary,
SampleConfig: heredoc.Doc(`
project_id: google-project-id
url: gcs://bucket_name/target_folder
object_prefix : github-users
service_account_base64: ____base64_encoded_service_account____
service_account_json: |-
{
"type": "service_account",
"private_key_id": "xxxxxxx",
"private_key": "xxxxxxx",
"client_email": "xxxxxxx",
"client_id": "xxxxxxx",
"auth_uri": "https://accounts.google.com/o/oauth2/auth",
"token_uri": "https://oauth2.googleapis.com/token",
"auth_provider_x509_cert_url": "xxxxxxx",
"client_x509_cert_url": "xxxxxxx"
}
`),
Tags: []string{"gcs", "sink"},
}
type Sink struct {
plugins.BasePlugin
logger log.Logger
writer client.Writer
config Config
}
func New(logger log.Logger) plugins.Syncer {
s := &Sink{
logger: logger,
}
s.BasePlugin = plugins.NewBasePlugin(info, &s.config)
return s
}
func (s *Sink) Init(ctx context.Context, config plugins.Config) (err error) {
if err = s.BasePlugin.Init(ctx, config); err != nil {
return err
}
if err := s.validateServiceAccountKey(); err != nil {
return err
}
bucketname, objectname := s.resolveBucketPath()
if s.writer, err = client.NewWriter(ctx, []byte(s.config.ServiceAccountJSON), bucketname, objectname); err != nil {
return err
}
return nil
}
func (s *Sink) validateServiceAccountKey() error {
if s.config.ServiceAccountBase64 == "" && s.config.ServiceAccountJSON == "" {
return errors.New("credentials are not specified, failed to create client")
}
if s.config.ServiceAccountBase64 != "" {
serviceAccountJSON, err := base64.StdEncoding.DecodeString(s.config.ServiceAccountBase64)
if err != nil || len(serviceAccountJSON) == 0 {
return fmt.Errorf("decode base64 service account: %w", err)
}
s.config.ServiceAccountJSON = string(serviceAccountJSON)
}
return nil
}
func (s *Sink) resolveBucketPath() (string, string) {
result, _ := url.Parse(s.config.URL)
bucketname := result.Host
path := result.Path[1:]
timestamp := time.Now().Format(time.RFC3339)
objectprefix := s.config.ObjectPrefix
if objectprefix != "" && objectprefix[len(objectprefix)-1] != '-' {
objectprefix = fmt.Sprintf("%s-", objectprefix)
}
objectname := fmt.Sprintf("%s%s.ndjson", objectprefix, timestamp)
if path != "" {
objectname = fmt.Sprintf("%s/%s%s.ndjson", path, objectprefix, timestamp)
}
return bucketname, objectname
}
func (s *Sink) Sink(ctx context.Context, batch []models.Record) (err error) {
data := make([]*assetsv1beta2.Asset, 0, len(batch))
for _, record := range batch {
data = append(data, record.Data())
}
if err = s.writeData(data); err != nil {
return fmt.Errorf("write data to the object: %w", err)
}
return nil
}
func (s *Sink) writeData(data []*assetsv1beta2.Asset) (err error) {
for _, asset := range data {
jsonBytes, _ := models.ToJSON(asset)
if err := s.writer.WriteData(jsonBytes); err != nil {
return err
}
if err := s.writer.WriteData([]byte("\n")); err != nil {
return err
}
}
return nil
}
func (s *Sink) Close() error {
return s.writer.Close()
}
func init() {
if err := registry.Sinks.Register("gcs", func() plugins.Syncer {
return New(plugins.GetLog())
}); err != nil {
panic(err)
}
}