mirror of
https://github.com/chrislusf/seaweedfs
synced 2024-08-31 06:00:38 +02:00
140 lines
3.4 KiB
Go
140 lines
3.4 KiB
Go
package operation
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import (
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"context"
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"encoding/json"
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"errors"
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"fmt"
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"google.golang.org/grpc"
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"math/rand"
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"net/url"
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"strings"
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"time"
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"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
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"github.com/chrislusf/seaweedfs/weed/util"
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)
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type Location struct {
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Url string `json:"url,omitempty"`
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PublicUrl string `json:"publicUrl,omitempty"`
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}
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type LookupResult struct {
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VolumeId string `json:"volumeId,omitempty"`
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Locations []Location `json:"locations,omitempty"`
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Error string `json:"error,omitempty"`
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}
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func (lr *LookupResult) String() string {
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return fmt.Sprintf("VolumeId:%s, Locations:%v, Error:%s", lr.VolumeId, lr.Locations, lr.Error)
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}
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var (
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vc VidCache // caching of volume locations, re-check if after 10 minutes
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)
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func Lookup(server string, vid string) (ret *LookupResult, err error) {
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locations, cache_err := vc.Get(vid)
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if cache_err != nil {
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if ret, err = do_lookup(server, vid); err == nil {
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vc.Set(vid, ret.Locations, 10*time.Minute)
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}
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} else {
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ret = &LookupResult{VolumeId: vid, Locations: locations}
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}
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return
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}
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func do_lookup(server string, vid string) (*LookupResult, error) {
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values := make(url.Values)
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values.Add("volumeId", vid)
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jsonBlob, err := util.Post("http://"+server+"/dir/lookup", values)
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if err != nil {
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return nil, err
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}
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var ret LookupResult
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err = json.Unmarshal(jsonBlob, &ret)
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if err != nil {
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return nil, err
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}
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if ret.Error != "" {
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return nil, errors.New(ret.Error)
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}
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return &ret, nil
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}
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func LookupFileId(server string, fileId string) (fullUrl string, err error) {
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parts := strings.Split(fileId, ",")
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if len(parts) != 2 {
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return "", errors.New("Invalid fileId " + fileId)
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}
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lookup, lookupError := Lookup(server, parts[0])
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if lookupError != nil {
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return "", lookupError
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}
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if len(lookup.Locations) == 0 {
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return "", errors.New("File Not Found")
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}
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return "http://" + lookup.Locations[rand.Intn(len(lookup.Locations))].Url + "/" + fileId, nil
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}
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// LookupVolumeIds find volume locations by cache and actual lookup
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func LookupVolumeIds(server string, grpcDialOption grpc.DialOption, vids []string) (map[string]LookupResult, error) {
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ret := make(map[string]LookupResult)
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var unknown_vids []string
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//check vid cache first
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for _, vid := range vids {
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locations, cache_err := vc.Get(vid)
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if cache_err == nil {
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ret[vid] = LookupResult{VolumeId: vid, Locations: locations}
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} else {
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unknown_vids = append(unknown_vids, vid)
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}
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}
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//return success if all volume ids are known
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if len(unknown_vids) == 0 {
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return ret, nil
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}
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//only query unknown_vids
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err := WithMasterServerClient(server, grpcDialOption, func(masterClient master_pb.SeaweedClient) error {
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req := &master_pb.LookupVolumeRequest{
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VolumeIds: unknown_vids,
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}
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resp, grpcErr := masterClient.LookupVolume(context.Background(), req)
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if grpcErr != nil {
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return grpcErr
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}
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//set newly checked vids to cache
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for _, vidLocations := range resp.VolumeIdLocations {
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var locations []Location
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for _, loc := range vidLocations.Locations {
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locations = append(locations, Location{
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Url: loc.Url,
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PublicUrl: loc.PublicUrl,
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})
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}
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if vidLocations.Error != "" {
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vc.Set(vidLocations.VolumeId, locations, 10*time.Minute)
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}
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ret[vidLocations.VolumeId] = LookupResult{
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VolumeId: vidLocations.VolumeId,
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Locations: locations,
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Error: vidLocations.Error,
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}
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}
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return nil
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})
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if err != nil {
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return nil, err
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}
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return ret, nil
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}
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