seaweedfs/weed/replication/source/filer_source.go
chrislu 9f9ef1340c use streaming mode for long poll grpc calls
streaming mode would create separate grpc connections for each call.
this is to ensure the long poll connections are properly closed.
2021-12-26 00:15:03 -08:00

141 lines
3.4 KiB
Go

package source
import (
"context"
"fmt"
"io"
"net/http"
"strings"
"google.golang.org/grpc"
"github.com/chrislusf/seaweedfs/weed/pb"
"github.com/chrislusf/seaweedfs/weed/security"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
"github.com/chrislusf/seaweedfs/weed/util"
)
type ReplicationSource interface {
ReadPart(part string) io.ReadCloser
}
type FilerSource struct {
grpcAddress string
grpcDialOption grpc.DialOption
Dir string
address string
proxyByFiler bool
}
func (fs *FilerSource) Initialize(configuration util.Configuration, prefix string) error {
return fs.DoInitialize(
"",
configuration.GetString(prefix+"grpcAddress"),
configuration.GetString(prefix+"directory"),
false,
)
}
func (fs *FilerSource) DoInitialize(address, grpcAddress string, dir string, readChunkFromFiler bool) (err error) {
fs.address = address
if fs.address == "" {
fs.address = pb.GrpcAddressToServerAddress(grpcAddress)
}
fs.grpcAddress = grpcAddress
fs.Dir = dir
fs.grpcDialOption = security.LoadClientTLS(util.GetViper(), "grpc.client")
fs.proxyByFiler = readChunkFromFiler
return nil
}
func (fs *FilerSource) LookupFileId(part string) (fileUrls []string, err error) {
vid2Locations := make(map[string]*filer_pb.Locations)
vid := volumeId(part)
err = fs.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
resp, err := client.LookupVolume(context.Background(), &filer_pb.LookupVolumeRequest{
VolumeIds: []string{vid},
})
if err != nil {
return err
}
vid2Locations = resp.LocationsMap
return nil
})
if err != nil {
glog.V(1).Infof("LookupFileId volume id %s: %v", vid, err)
return nil, fmt.Errorf("LookupFileId volume id %s: %v", vid, err)
}
locations := vid2Locations[vid]
if locations == nil || len(locations.Locations) == 0 {
glog.V(1).Infof("LookupFileId locate volume id %s: %v", vid, err)
return nil, fmt.Errorf("LookupFileId locate volume id %s: %v", vid, err)
}
if !fs.proxyByFiler {
for _, loc := range locations.Locations {
fileUrls = append(fileUrls, fmt.Sprintf("http://%s/%s?readDeleted=true", loc.Url, part))
}
} else {
fileUrls = append(fileUrls, fmt.Sprintf("http://%s/?proxyChunkId=%s", fs.address, part))
}
return
}
func (fs *FilerSource) ReadPart(fileId string) (filename string, header http.Header, resp *http.Response, err error) {
if fs.proxyByFiler {
return util.DownloadFile("http://"+fs.address+"/?proxyChunkId="+fileId, "")
}
fileUrls, err := fs.LookupFileId(fileId)
if err != nil {
return "", nil, nil, err
}
for _, fileUrl := range fileUrls {
filename, header, resp, err = util.DownloadFile(fileUrl, "")
if err != nil {
glog.V(1).Infof("fail to read from %s: %v", fileUrl, err)
} else {
break
}
}
return filename, header, resp, err
}
var _ = filer_pb.FilerClient(&FilerSource{})
func (fs *FilerSource) WithFilerClient(streamingMode bool, fn func(filer_pb.SeaweedFilerClient) error) error {
return pb.WithGrpcClient(streamingMode, func(grpcConnection *grpc.ClientConn) error {
client := filer_pb.NewSeaweedFilerClient(grpcConnection)
return fn(client)
}, fs.grpcAddress, fs.grpcDialOption)
}
func (fs *FilerSource) AdjustedUrl(location *filer_pb.Location) string {
return location.Url
}
func volumeId(fileId string) string {
lastCommaIndex := strings.LastIndex(fileId, ",")
if lastCommaIndex > 0 {
return fileId[:lastCommaIndex]
}
return fileId
}