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client.go
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client.go
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package gcs
import (
"bytes"
"context"
"io"
"cloud.google.com/go/storage"
"github.com/democracy-tools/countmein-stats/internal/env"
log "github.com/sirupsen/logrus"
"golang.org/x/oauth2/google"
"google.golang.org/api/option"
)
const EnvKeyGCSToken = "GCS_KEY"
type Client interface {
Update(name string, data []byte) error
Close() error
}
type ClientWrapper struct {
store *storage.Client
projectId string
bucket string
}
func NewClientWrapper(project string, bucketName string) Client {
if key := env.GetEnvSensitive(EnvKeyGCSToken); key != "" {
conf, err := google.JWTConfigFromJSON([]byte(key), storage.ScopeReadWrite)
if err != nil {
log.Fatalf("failed to config storage JWT with '%v'", err)
}
ctx := context.Background()
client, err := storage.NewClient(ctx, option.WithTokenSource(conf.TokenSource(ctx)))
if err != nil {
log.Fatalf("failed to create GCS client with '%v'", err)
}
return newClientWrapper(client, project, bucketName)
}
client, err := storage.NewClient(context.Background())
if err != nil {
log.Fatalf("failed to create GCS client without token with '%v'", err)
}
return newClientWrapper(client, project, bucketName)
}
func newClientWrapper(client *storage.Client, project string, bucketName string) Client {
return &ClientWrapper{store: client, projectId: project, bucket: bucketName}
}
func (client *ClientWrapper) Update(name string, data []byte) error {
writer := client.store.Bucket(client.bucket).Object(name).NewWriter(context.Background())
writer.ObjectAttrs.CacheControl = "no-cache, max-age=0"
_, err := io.Copy(writer, bytes.NewReader(data))
if err != nil {
log.Errorf("failed to copy file '%s' into bucket '%s' with '%v'", name, client.bucket, err)
return err
}
if err = writer.Close(); err != nil {
log.Errorf("failed to close GCS file writer. bucket '%s' file '%s' with '%v'", client.bucket, name, err)
return err
}
return nil
}
func (client *ClientWrapper) Close() error {
return client.store.Close()
}