mirror of
https://github.com/chrislusf/seaweedfs
synced 2024-09-12 20:10:41 +02:00
196 lines
5.1 KiB
Go
196 lines
5.1 KiB
Go
package topology
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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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"net/http"
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"net/url"
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"strconv"
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"strings"
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"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/operation"
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"github.com/chrislusf/seaweedfs/weed/security"
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"github.com/chrislusf/seaweedfs/weed/storage"
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"github.com/chrislusf/seaweedfs/weed/storage/needle"
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"github.com/chrislusf/seaweedfs/weed/storage/types"
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"github.com/chrislusf/seaweedfs/weed/util"
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)
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func ReplicatedWrite(masterNode string, s *storage.Store, volumeId needle.VolumeId, n *needle.Needle, r *http.Request) (isUnchanged bool, err error) {
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//check JWT
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jwt := security.GetJwt(r)
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// check whether this is a replicated write request
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var remoteLocations []operation.Location
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if r.FormValue("type") != "replicate" {
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// this is the initial request
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remoteLocations, err = getWritableRemoteReplications(s, volumeId, masterNode)
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if err != nil {
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glog.V(0).Infoln(err)
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return
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}
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}
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// read fsync value
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fsync := false
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if r.FormValue("fsync") == "true" {
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fsync = true
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}
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if s.GetVolume(volumeId) != nil {
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isUnchanged, err = s.WriteVolumeNeedle(volumeId, n, fsync)
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if err != nil {
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err = fmt.Errorf("failed to write to local disk: %v", err)
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glog.V(0).Infoln(err)
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return
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}
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}
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if len(remoteLocations) > 0 { //send to other replica locations
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if err = distributedOperation(remoteLocations, s, func(location operation.Location) error {
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u := url.URL{
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Scheme: "http",
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Host: location.Url,
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Path: r.URL.Path,
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}
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q := url.Values{
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"type": {"replicate"},
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"ttl": {n.Ttl.String()},
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}
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if n.LastModified > 0 {
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q.Set("ts", strconv.FormatUint(n.LastModified, 10))
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}
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if n.IsChunkedManifest() {
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q.Set("cm", "true")
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}
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u.RawQuery = q.Encode()
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pairMap := make(map[string]string)
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if n.HasPairs() {
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tmpMap := make(map[string]string)
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err := json.Unmarshal(n.Pairs, &tmpMap)
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if err != nil {
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glog.V(0).Infoln("Unmarshal pairs error:", err)
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}
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for k, v := range tmpMap {
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pairMap[needle.PairNamePrefix+k] = v
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}
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}
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// volume server do not know about encryption
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_, err := operation.UploadData(u.String(), string(n.Name), false, n.Data, n.IsCompressed(), string(n.Mime), pairMap, jwt)
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return err
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}); err != nil {
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err = fmt.Errorf("failed to write to replicas for volume %d: %v", volumeId, err)
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glog.V(0).Infoln(err)
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}
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}
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return
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}
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func ReplicatedDelete(masterNode string, store *storage.Store,
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volumeId needle.VolumeId, n *needle.Needle,
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r *http.Request) (size types.Size, err error) {
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//check JWT
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jwt := security.GetJwt(r)
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var remoteLocations []operation.Location
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if r.FormValue("type") != "replicate" {
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remoteLocations, err = getWritableRemoteReplications(store, volumeId, masterNode)
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if err != nil {
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glog.V(0).Infoln(err)
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return
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}
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}
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size, err = store.DeleteVolumeNeedle(volumeId, n)
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if err != nil {
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glog.V(0).Infoln("delete error:", err)
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return
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}
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if len(remoteLocations) > 0 { //send to other replica locations
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if err = distributedOperation(remoteLocations, store, func(location operation.Location) error {
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return util.Delete("http://"+location.Url+r.URL.Path+"?type=replicate", string(jwt))
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}); err != nil {
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size = 0
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}
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}
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return
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}
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type DistributedOperationResult map[string]error
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func (dr DistributedOperationResult) Error() error {
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var errs []string
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for k, v := range dr {
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if v != nil {
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errs = append(errs, fmt.Sprintf("[%s]: %v", k, v))
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}
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}
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if len(errs) == 0 {
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return nil
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}
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return errors.New(strings.Join(errs, "\n"))
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}
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type RemoteResult struct {
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Host string
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Error error
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}
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func distributedOperation(locations []operation.Location, store *storage.Store, op func(location operation.Location) error) error {
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length := len(locations)
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results := make(chan RemoteResult)
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for _, location := range locations {
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go func(location operation.Location, results chan RemoteResult) {
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results <- RemoteResult{location.Url, op(location)}
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}(location, results)
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}
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ret := DistributedOperationResult(make(map[string]error))
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for i := 0; i < length; i++ {
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result := <-results
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ret[result.Host] = result.Error
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}
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return ret.Error()
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}
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func getWritableRemoteReplications(s *storage.Store, volumeId needle.VolumeId, masterNode string) (
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remoteLocations []operation.Location, err error) {
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v := s.GetVolume(volumeId)
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if v != nil && v.ReplicaPlacement.GetCopyCount() == 1 {
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return
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}
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// not on local store, or has replications
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lookupResult, lookupErr := operation.Lookup(masterNode, volumeId.String())
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if lookupErr == nil {
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selfUrl := s.Ip + ":" + strconv.Itoa(s.Port)
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for _, location := range lookupResult.Locations {
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if location.Url != selfUrl {
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remoteLocations = append(remoteLocations, location)
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}
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}
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} else {
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err = fmt.Errorf("failed to lookup for %d: %v", volumeId, lookupErr)
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return
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}
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if v != nil {
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// has one local and has remote replications
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copyCount := v.ReplicaPlacement.GetCopyCount()
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if len(lookupResult.Locations) < copyCount {
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err = fmt.Errorf("replicating opetations [%d] is less than volume %d replication copy count [%d]",
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len(lookupResult.Locations), volumeId, copyCount)
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}
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}
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return
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}
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