seaweedfs/weed/replication/sink/gcssink/gcs_sink.go

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package gcssink
import (
"context"
"fmt"
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"os"
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"cloud.google.com/go/storage"
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"github.com/chrislusf/seaweedfs/weed/filer2"
"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
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"github.com/chrislusf/seaweedfs/weed/replication/sink"
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"github.com/chrislusf/seaweedfs/weed/replication/source"
"github.com/chrislusf/seaweedfs/weed/util"
"google.golang.org/api/option"
)
type GcsSink struct {
client *storage.Client
bucket string
dir string
filerSource *source.FilerSource
}
func init() {
sink.Sinks = append(sink.Sinks, &GcsSink{})
}
func (g *GcsSink) GetName() string {
return "google_cloud_storage"
}
func (g *GcsSink) GetSinkToDirectory() string {
return g.dir
}
func (g *GcsSink) Initialize(configuration util.Configuration) error {
return g.initialize(
configuration.GetString("google_application_credentials"),
configuration.GetString("bucket"),
configuration.GetString("directory"),
)
}
func (g *GcsSink) SetSourceFiler(s *source.FilerSource) {
g.filerSource = s
}
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func (g *GcsSink) initialize(google_application_credentials, bucketName, dir string) error {
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g.bucket = bucketName
g.dir = dir
ctx := context.Background()
// Creates a client.
if google_application_credentials == "" {
var found bool
google_application_credentials, found = os.LookupEnv("GOOGLE_APPLICATION_CREDENTIALS")
if !found {
glog.Fatalf("need to specific GOOGLE_APPLICATION_CREDENTIALS env variable or google_application_credentials in replication.toml")
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}
}
client, err := storage.NewClient(ctx, option.WithCredentialsFile(google_application_credentials))
if err != nil {
glog.Fatalf("Failed to create client: %v", err)
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}
g.client = client
return nil
}
func (g *GcsSink) DeleteEntry(key string, isDirectory, deleteIncludeChunks bool) error {
if isDirectory {
key = key + "/"
}
if err := g.client.Bucket(g.bucket).Object(key).Delete(context.Background()); err != nil {
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return fmt.Errorf("gcs delete %s%s: %v", g.bucket, key, err)
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}
return nil
}
func (g *GcsSink) CreateEntry(key string, entry *filer_pb.Entry) error {
if entry.IsDirectory {
return nil
}
totalSize := filer2.TotalSize(entry.Chunks)
chunkViews := filer2.ViewFromChunks(entry.Chunks, 0, int(totalSize))
ctx := context.Background()
wc := g.client.Bucket(g.bucket).Object(key).NewWriter(ctx)
for _, chunk := range chunkViews {
fileUrl, err := g.filerSource.LookupFileId(chunk.FileId)
if err != nil {
return err
}
_, err = util.ReadUrlAsStream(fileUrl, chunk.Offset, int(chunk.Size), func(data []byte) {
wc.Write(data)
})
if err != nil {
return err
}
}
if err := wc.Close(); err != nil {
return err
}
return nil
}
func (g *GcsSink) UpdateEntry(key string, oldEntry, newEntry *filer_pb.Entry, deleteIncludeChunks bool) (foundExistingEntry bool, err error) {
// TODO improve efficiency
return false, nil
}