package topology import ( "encoding/json" "errors" "fmt" "net/http" "net/url" "strconv" "strings" "github.com/chrislusf/seaweedfs/weed/glog" "github.com/chrislusf/seaweedfs/weed/operation" "github.com/chrislusf/seaweedfs/weed/security" "github.com/chrislusf/seaweedfs/weed/storage" "github.com/chrislusf/seaweedfs/weed/storage/needle" "github.com/chrislusf/seaweedfs/weed/storage/types" "github.com/chrislusf/seaweedfs/weed/util" ) func ReplicatedWrite(masterFn operation.GetMasterFn, s *storage.Store, volumeId needle.VolumeId, n *needle.Needle, r *http.Request) (isUnchanged bool, err error) { //check JWT jwt := security.GetJwt(r) // check whether this is a replicated write request var remoteLocations []operation.Location if r.FormValue("type") != "replicate" { // this is the initial request remoteLocations, err = getWritableRemoteReplications(s, volumeId, masterFn) if err != nil { glog.V(0).Infoln(err) return } } // read fsync value fsync := false if r.FormValue("fsync") == "true" { fsync = true } if s.GetVolume(volumeId) != nil { isUnchanged, err = s.WriteVolumeNeedle(volumeId, n, fsync) if err != nil { err = fmt.Errorf("failed to write to local disk: %v", err) glog.V(0).Infoln(err) return } } if len(remoteLocations) > 0 { //send to other replica locations if err = distributedOperation(remoteLocations, s, func(location operation.Location) error { u := url.URL{ Scheme: "http", Host: location.Url, Path: r.URL.Path, } q := url.Values{ "type": {"replicate"}, "ttl": {n.Ttl.String()}, } if n.LastModified > 0 { q.Set("ts", strconv.FormatUint(n.LastModified, 10)) } if n.IsChunkedManifest() { q.Set("cm", "true") } u.RawQuery = q.Encode() pairMap := make(map[string]string) if n.HasPairs() { tmpMap := make(map[string]string) err := json.Unmarshal(n.Pairs, &tmpMap) if err != nil { glog.V(0).Infoln("Unmarshal pairs error:", err) } for k, v := range tmpMap { pairMap[needle.PairNamePrefix+k] = v } } // volume server do not know about encryption // TODO optimize here to compress data only once _, err := operation.UploadData(u.String(), string(n.Name), false, n.Data, n.IsCompressed(), string(n.Mime), pairMap, jwt) return err }); err != nil { err = fmt.Errorf("failed to write to replicas for volume %d: %v", volumeId, err) glog.V(0).Infoln(err) } } return } func ReplicatedDelete(masterFn operation.GetMasterFn, store *storage.Store, volumeId needle.VolumeId, n *needle.Needle, r *http.Request) (size types.Size, err error) { //check JWT jwt := security.GetJwt(r) var remoteLocations []operation.Location if r.FormValue("type") != "replicate" { remoteLocations, err = getWritableRemoteReplications(store, volumeId, masterFn) if err != nil { glog.V(0).Infoln(err) return } } size, err = store.DeleteVolumeNeedle(volumeId, n) if err != nil { glog.V(0).Infoln("delete error:", err) return } if len(remoteLocations) > 0 { //send to other replica locations if err = distributedOperation(remoteLocations, store, func(location operation.Location) error { return util.Delete("http://"+location.Url+r.URL.Path+"?type=replicate", string(jwt)) }); err != nil { size = 0 } } return } type DistributedOperationResult map[string]error func (dr DistributedOperationResult) Error() error { var errs []string for k, v := range dr { if v != nil { errs = append(errs, fmt.Sprintf("[%s]: %v", k, v)) } } if len(errs) == 0 { return nil } return errors.New(strings.Join(errs, "\n")) } type RemoteResult struct { Host string Error error } func distributedOperation(locations []operation.Location, store *storage.Store, op func(location operation.Location) error) error { length := len(locations) results := make(chan RemoteResult) for _, location := range locations { go func(location operation.Location, results chan RemoteResult) { results <- RemoteResult{location.Url, op(location)} }(location, results) } ret := DistributedOperationResult(make(map[string]error)) for i := 0; i < length; i++ { result := <-results ret[result.Host] = result.Error } return ret.Error() } func getWritableRemoteReplications(s *storage.Store, volumeId needle.VolumeId, masterFn operation.GetMasterFn) ( remoteLocations []operation.Location, err error) { v := s.GetVolume(volumeId) if v != nil && v.ReplicaPlacement.GetCopyCount() == 1 { return } // not on local store, or has replications lookupResult, lookupErr := operation.Lookup(masterFn, volumeId.String()) if lookupErr == nil { selfUrl := s.Ip + ":" + strconv.Itoa(s.Port) for _, location := range lookupResult.Locations { if location.Url != selfUrl { remoteLocations = append(remoteLocations, location) } } } else { err = fmt.Errorf("failed to lookup for %d: %v", volumeId, lookupErr) return } if v != nil { // has one local and has remote replications copyCount := v.ReplicaPlacement.GetCopyCount() if len(lookupResult.Locations) < copyCount { err = fmt.Errorf("replicating opetations [%d] is less than volume %d replication copy count [%d]", len(lookupResult.Locations), volumeId, copyCount) } } return }