func distributedOperation(masterNode string, store *storage.Store, volumeId storage.VolumeId, op func(location operation.Location) bool) bool {
if lookupResult, lookupErr := operation.Lookup(masterNode, volumeId.String()); lookupErr == nil {
length := 0
selfUrl := (store.Ip + ":" + strconv.Itoa(store.Port))
results := make(chan bool)
for _, location := range lookupResult.Locations {
if location.Url != selfUrl {
length++
go func(location operation.Location, results chan bool) {
results <- op(location)
}(location, results)
}
}
ret := true
for i := 0; i < length; i++ {
ret = ret && <-results
}
if volume := store.GetVolume(volumeId); volume != nil {
if length+1 < volume.ReplicaPlacement.GetCopyCount() {
glog.V(0).Infof("replicating opetations [%d] is less than volume's replication copy count [%d]", length+1, volume.ReplicaPlacement.GetCopyCount())
ret = false
}
}
return ret
} else {
glog.V(0).Infoln("Failed to lookup for", volumeId, lookupErr.Error())
}
return false
}
func ReplicatedDelete(masterNode string, store *storage.Store,
volumeId storage.VolumeId, n *storage.Needle,
r *http.Request) (ret uint32) {
//check JWT
jwt := security.GetJwt(r)
ret, err := store.Delete(volumeId, n)
if err != nil {
glog.V(0).Infoln("delete error:", err)
return
}
needToReplicate := !store.HasVolume(volumeId)
if !needToReplicate && ret > 0 {
needToReplicate = store.GetVolume(volumeId).NeedToReplicate()
}
if needToReplicate { //send to other replica locations
if r.FormValue("type") != "replicate" {
if !distributedOperation(masterNode, store, volumeId, func(location operation.Location) bool {
return nil == util.Delete("http://"+location.Url+r.URL.Path+"?type=replicate", jwt)
}) {
ret = 0
}
}
}
return
}
func ReplicatedWrite(masterNode string, s *storage.Store,
volumeId storage.VolumeId, needle *storage.Needle,
r *http.Request) (size uint32, errorStatus string) {
//check JWT
jwt := security.GetJwt(r)
ret, err := s.Write(volumeId, needle)
needToReplicate := !s.HasVolume(volumeId)
if err != nil {
errorStatus = "Failed to write to local disk (" + err.Error() + ")"
} else if ret > 0 {
needToReplicate = needToReplicate || s.GetVolume(volumeId).NeedToReplicate()
} else {
errorStatus = "Failed to write to local disk"
}
if !needToReplicate && ret > 0 {
needToReplicate = s.GetVolume(volumeId).NeedToReplicate()
}
if needToReplicate { //send to other replica locations
if r.FormValue("type") != "replicate" {
if !distributedOperation(masterNode, s, volumeId, func(location operation.Location) bool {
_, err := operation.Upload(
"http://"+location.Url+r.URL.Path+"?type=replicate&ts="+strconv.FormatUint(needle.LastModified, 10),
string(needle.Name), bytes.NewReader(needle.Data), needle.IsGzipped(), string(needle.Mime),
jwt)
return err == nil
}) {
ret = 0
errorStatus = "Failed to write to replicas for volume " + volumeId.String()
}
}
}
size = ret
return
}