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118 lines
2.9 KiB
118 lines
2.9 KiB
package operation
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import (
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"encoding/json"
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"errors"
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"fmt"
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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/weed-fs/go/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, 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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values := make(url.Values)
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for _, vid := range unknown_vids {
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values.Add("volumeId", vid)
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}
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jsonBlob, err := util.Post("http://"+server+"/vol/lookup", values)
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if err != nil {
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return nil, err
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}
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err = json.Unmarshal(jsonBlob, &ret)
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if err != nil {
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return nil, errors.New(err.Error() + " " + string(jsonBlob))
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}
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//set newly checked vids to cache
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for _, vid := range unknown_vids {
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locations := ret[vid].Locations
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vc.Set(vid, locations, 10*time.Minute)
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}
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return ret, nil
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}
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