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108 lines
2.8 KiB
108 lines
2.8 KiB
package source
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import (
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"context"
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"fmt"
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"io"
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"net/http"
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"strings"
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"google.golang.org/grpc"
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"github.com/chrislusf/seaweedfs/weed/security"
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"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/util"
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)
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type ReplicationSource interface {
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ReadPart(part string) io.ReadCloser
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}
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type FilerSource struct {
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grpcAddress string
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grpcDialOption grpc.DialOption
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Dir string
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}
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func (fs *FilerSource) Initialize(configuration util.Configuration, prefix string) error {
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return fs.initialize(
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configuration.GetString(prefix+"grpcAddress"),
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configuration.GetString(prefix+"directory"),
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)
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}
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func (fs *FilerSource) initialize(grpcAddress string, dir string) (err error) {
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fs.grpcAddress = grpcAddress
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fs.Dir = dir
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fs.grpcDialOption = security.LoadClientTLS(util.GetViper(), "grpc.client")
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return nil
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}
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func (fs *FilerSource) LookupFileId(ctx context.Context, part string) (fileUrl string, err error) {
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vid2Locations := make(map[string]*filer_pb.Locations)
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vid := volumeId(part)
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err = fs.withFilerClient(ctx, fs.grpcDialOption, func(ctx context.Context, client filer_pb.SeaweedFilerClient) error {
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glog.V(4).Infof("read lookup volume id locations: %v", vid)
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resp, err := client.LookupVolume(ctx, &filer_pb.LookupVolumeRequest{
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VolumeIds: []string{vid},
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})
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if err != nil {
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return err
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}
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vid2Locations = resp.LocationsMap
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return nil
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})
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if err != nil {
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glog.V(1).Infof("LookupFileId volume id %s: %v", vid, err)
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return "", fmt.Errorf("LookupFileId volume id %s: %v", vid, err)
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}
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locations := vid2Locations[vid]
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if locations == nil || len(locations.Locations) == 0 {
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glog.V(1).Infof("LookupFileId locate volume id %s: %v", vid, err)
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return "", fmt.Errorf("LookupFileId locate volume id %s: %v", vid, err)
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}
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fileUrl = fmt.Sprintf("http://%s/%s", locations.Locations[0].Url, part)
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return
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}
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func (fs *FilerSource) ReadPart(ctx context.Context, part string) (filename string, header http.Header, readCloser io.ReadCloser, err error) {
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fileUrl, err := fs.LookupFileId(ctx, part)
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if err != nil {
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return "", nil, nil, err
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}
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filename, header, readCloser, err = util.DownloadFile(fileUrl)
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return filename, header, readCloser, err
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}
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func (fs *FilerSource) withFilerClient(ctx context.Context, grpcDialOption grpc.DialOption, fn func(context.Context, filer_pb.SeaweedFilerClient) error) error {
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return util.WithCachedGrpcClient(ctx, func(ctx2 context.Context, grpcConnection *grpc.ClientConn) error {
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client := filer_pb.NewSeaweedFilerClient(grpcConnection)
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return fn(ctx2, client)
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}, fs.grpcAddress, fs.grpcDialOption)
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}
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func volumeId(fileId string) string {
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lastCommaIndex := strings.LastIndex(fileId, ",")
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if lastCommaIndex > 0 {
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return fileId[:lastCommaIndex]
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}
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return fileId
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}
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