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Join room support in federation sender (#989)

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* Implement PerformJoinRequest

* Rename perform functions

* Check send join response

* Temporary wiring to test federation sender room joins

* Actually pass through the config

* Make sure membership content shows join
This commit is contained in:
Neil Alexander 2020-04-29 15:29:39 +01:00 committed by GitHub
parent a308e61331
commit 64e94e9a6f
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GPG key ID: 4AEE18F83AFDEB23
14 changed files with 265 additions and 135 deletions
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124
clientapi/routing/joinroom.go
View file

@ -27,12 +27,11 @@ import (
"github.com/matrix-org/dendrite/clientapi/producers"
"github.com/matrix-org/dendrite/common"
"github.com/matrix-org/dendrite/common/config"
"github.com/matrix-org/dendrite/roomserver/api"
federationSenderAPI "github.com/matrix-org/dendrite/federationsender/api"
roomserverAPI "github.com/matrix-org/dendrite/roomserver/api"
"github.com/matrix-org/gomatrix"
"github.com/matrix-org/gomatrixserverlib"
"github.com/matrix-org/util"
"github.com/sirupsen/logrus"
)
// JoinRoomByIDOrAlias implements the "/join/{roomIDOrAlias}" API.
@ -46,6 +45,7 @@ func JoinRoomByIDOrAlias(
producer *producers.RoomserverProducer,
queryAPI roomserverAPI.RoomserverQueryAPI,
aliasAPI roomserverAPI.RoomserverAliasAPI,
fsAPI federationSenderAPI.FederationSenderInternalAPI,
keyRing gomatrixserverlib.KeyRing,
accountDB accounts.Database,
) util.JSONResponse {
@ -79,7 +79,8 @@ func JoinRoomByIDOrAlias(
content["avatar_url"] = profile.AvatarURL
r := joinRoomReq{
req, evTime, content, device.UserID, cfg, federation, producer, queryAPI, aliasAPI, keyRing,
req, evTime, content, device.UserID, cfg, federation, producer,
queryAPI, aliasAPI, fsAPI, keyRing,
}
if strings.HasPrefix(roomIDOrAlias, "!") {
@ -107,6 +108,7 @@ type joinRoomReq struct {
producer *producers.RoomserverProducer
queryAPI roomserverAPI.RoomserverQueryAPI
aliasAPI roomserverAPI.RoomserverAliasAPI
fsAPI federationSenderAPI.FederationSenderInternalAPI
keyRing gomatrixserverlib.KeyRing
}
@ -326,71 +328,15 @@ func (r joinRoomReq) joinRoomUsingServers(
// server was invalid this returns an error.
// Otherwise this returns a JSONResponse.
func (r joinRoomReq) joinRoomUsingServer(roomID string, server gomatrixserverlib.ServerName) (*util.JSONResponse, error) {
// Ask the room server for information about room versions.
var request api.QueryRoomVersionCapabilitiesRequest
var response api.QueryRoomVersionCapabilitiesResponse
if err := r.queryAPI.QueryRoomVersionCapabilities(r.req.Context(), &request, &response); err != nil {
fedJoinReq := federationSenderAPI.PerformJoinRequest{
RoomID: roomID,
UserID: r.userID,
ServerName: server,
}
fedJoinRes := federationSenderAPI.PerformJoinResponse{}
if err := r.fsAPI.PerformJoin(r.req.Context(), &fedJoinReq, &fedJoinRes); err != nil {
return nil, err
}
var supportedVersions []gomatrixserverlib.RoomVersion
for version := range response.AvailableRoomVersions {
supportedVersions = append(supportedVersions, version)
}
respMakeJoin, err := r.federation.MakeJoin(r.req.Context(), server, roomID, r.userID, supportedVersions)
if err != nil {
// TODO: Check if the user was not allowed to join the room.
return nil, fmt.Errorf("r.federation.MakeJoin: %w", err)
}
// Set all the fields to be what they should be, this should be a no-op
// but it's possible that the remote server returned us something "odd"
err = r.writeToBuilder(&respMakeJoin.JoinEvent, roomID)
if err != nil {
return nil, fmt.Errorf("r.writeToBuilder: %w", err)
}
if respMakeJoin.RoomVersion == "" {
respMakeJoin.RoomVersion = gomatrixserverlib.RoomVersionV1
}
if _, err = respMakeJoin.RoomVersion.EventFormat(); err != nil {
return &util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.UnsupportedRoomVersion(
fmt.Sprintf("Room version '%s' is not supported", respMakeJoin.RoomVersion),
),
}, nil
}
event, err := respMakeJoin.JoinEvent.Build(
r.evTime, r.cfg.Matrix.ServerName, r.cfg.Matrix.KeyID,
r.cfg.Matrix.PrivateKey, respMakeJoin.RoomVersion,
)
if err != nil {
return nil, fmt.Errorf("respMakeJoin.JoinEvent.Build: %w", err)
}
respSendJoin, err := r.federation.SendJoin(r.req.Context(), server, event, respMakeJoin.RoomVersion)
if err != nil {
return nil, fmt.Errorf("r.federation.SendJoin: %w", err)
}
if err = r.checkSendJoinResponse(event, server, respMakeJoin, respSendJoin); err != nil {
return nil, err
}
util.GetLogger(r.req.Context()).WithFields(logrus.Fields{
"room_id": roomID,
"num_auth_events": len(respSendJoin.AuthEvents),
"num_state_events": len(respSendJoin.StateEvents),
}).Info("Room join signature and auth verification passed")
if err = r.producer.SendEventWithState(
r.req.Context(),
respSendJoin.ToRespState(),
event.Headered(respMakeJoin.RoomVersion),
); err != nil {
util.GetLogger(r.req.Context()).WithError(err).Error("r.producer.SendEventWithState")
}
return &util.JSONResponse{
Code: http.StatusOK,
@ -400,49 +346,3 @@ func (r joinRoomReq) joinRoomUsingServer(roomID string, server gomatrixserverlib
}{roomID},
}, nil
}
// checkSendJoinResponse checks that all of the signatures are correct
// and that the join is allowed by the supplied state.
func (r joinRoomReq) checkSendJoinResponse(
event gomatrixserverlib.Event,
server gomatrixserverlib.ServerName,
respMakeJoin gomatrixserverlib.RespMakeJoin,
respSendJoin gomatrixserverlib.RespSendJoin,
) error {
// A list of events that we have retried, if they were not included in
// the auth events supplied in the send_join.
retries := map[string]bool{}
retryCheck:
// TODO: Can we expand Check here to return a list of missing auth
// events rather than failing one at a time?
if err := respSendJoin.Check(r.req.Context(), r.keyRing, event); err != nil {
switch e := err.(type) {
case gomatrixserverlib.MissingAuthEventError:
// Check that we haven't already retried for this event, prevents
// us from ending up in endless loops
if !retries[e.AuthEventID] {
// Ask the server that we're talking to right now for the event
tx, txerr := r.federation.GetEvent(r.req.Context(), server, e.AuthEventID)
if txerr != nil {
return fmt.Errorf("r.federation.GetEvent: %w", txerr)
}
// For each event returned, add it to the auth events.
for _, pdu := range tx.PDUs {
ev, everr := gomatrixserverlib.NewEventFromUntrustedJSON(pdu, respMakeJoin.RoomVersion)
if everr != nil {
return fmt.Errorf("gomatrixserverlib.NewEventFromUntrustedJSON: %w", everr)
}
respSendJoin.AuthEvents = append(respSendJoin.AuthEvents, ev)
}
// Mark the event as retried and then give the check another go.
retries[e.AuthEventID] = true
goto retryCheck
}
return fmt.Errorf("respSendJoin (after retries): %w", e)
default:
return fmt.Errorf("respSendJoin: %w", err)
}
}
return nil
}

3
clientapi/routing/routing.go
View file

@ -101,7 +101,8 @@ func Setup(
return util.ErrorResponse(err)
}
return JoinRoomByIDOrAlias(
req, device, vars["roomIDOrAlias"], cfg, federation, producer, queryAPI, aliasAPI, keyRing, accountDB,
req, device, vars["roomIDOrAlias"], cfg, federation, producer,
queryAPI, aliasAPI, federationSender, keyRing, accountDB,
)
}),
).Methods(http.MethodPost, http.MethodOptions)

2
cmd/dendrite-demo-libp2p/main.go
View file

@ -153,7 +153,7 @@ func main() {
asQuery := appservice.SetupAppServiceAPIComponent(
&base.Base, accountDB, deviceDB, federation, alias, query, transactions.New(),
)
fsAPI := federationsender.SetupFederationSenderComponent(&base.Base, federation, query, input)
fsAPI := federationsender.SetupFederationSenderComponent(&base.Base, federation, query, input, &keyRing)
clientapi.SetupClientAPIComponent(
&base.Base, deviceDB, accountDB,

5
cmd/dendrite-federation-sender-server/main.go
View file

@ -16,6 +16,7 @@ package main
import (
"github.com/matrix-org/dendrite/common/basecomponent"
"github.com/matrix-org/dendrite/common/keydb"
"github.com/matrix-org/dendrite/federationsender"
)
@ -25,11 +26,13 @@ func main() {
defer base.Close() // nolint: errcheck
federation := base.CreateFederationClient()
keyDB := base.CreateKeyDB()
keyRing := keydb.CreateKeyRing(federation.Client, keyDB, cfg.Matrix.KeyPerspectives)
_, input, query := base.CreateHTTPRoomserverAPIs()
federationsender.SetupFederationSenderComponent(
base, federation, query, input,
base, federation, query, input, &keyRing,
)
base.SetupAndServeHTTP(string(base.Cfg.Bind.FederationSender), string(base.Cfg.Listen.FederationSender))

2
cmd/dendrite-monolith-server/main.go
View file

@ -62,7 +62,7 @@ func main() {
asQuery := appservice.SetupAppServiceAPIComponent(
base, accountDB, deviceDB, federation, alias, query, transactions.New(),
)
fsAPI := federationsender.SetupFederationSenderComponent(base, federation, query, input)
fsAPI := federationsender.SetupFederationSenderComponent(base, federation, query, input, &keyRing)
input.SetFederationSenderAPI(fsAPI)
clientapi.SetupClientAPIComponent(

2
cmd/dendritejs/main.go
View file

@ -128,7 +128,7 @@ func main() {
asQuery := appservice.SetupAppServiceAPIComponent(
base, accountDB, deviceDB, federation, alias, query, transactions.New(),
)
fedSenderAPI := federationsender.SetupFederationSenderComponent(base, federation, query, input)
fedSenderAPI := federationsender.SetupFederationSenderComponent(base, federation, query, input, &keyRing)
input.SetFederationSenderAPI(fedSenderAPI)
clientapi.SetupClientAPIComponent(

4
federationsender/api/api.go
View file

@ -25,13 +25,13 @@ type FederationSenderInternalAPI interface {
response *QueryJoinedHostServerNamesInRoomResponse,
) error
// Handle an instruction to make_join & send_join with a remote server.
PerformJoinRequest(
PerformJoin(
ctx context.Context,
request *PerformJoinRequest,
response *PerformJoinResponse,
) error
// Handle an instruction to make_leave & send_leave with a remote server.
PerformLeaveRequest(
PerformLeave(
ctx context.Context,
request *PerformLeaveRequest,
response *PerformLeaveResponse,

10
federationsender/api/perform.go
View file

@ -4,6 +4,7 @@ import (
"context"
commonHTTP "github.com/matrix-org/dendrite/common/http"
"github.com/matrix-org/gomatrixserverlib"
"github.com/opentracing/opentracing-go"
)
@ -16,14 +17,17 @@ const (
)
type PerformJoinRequest struct {
RoomID string `json:"room_id"`
RoomID string `json:"room_id"`
UserID string `json:"user_id"`
ServerName gomatrixserverlib.ServerName `json:"server_name"`
Content map[string]interface{} `json:"content"`
}
type PerformJoinResponse struct {
}
// Handle an instruction to make_join & send_join with a remote server.
func (h *httpFederationSenderInternalAPI) PerformJoinRequest(
func (h *httpFederationSenderInternalAPI) PerformJoin(
ctx context.Context,
request *PerformJoinRequest,
response *PerformJoinResponse,
@ -43,7 +47,7 @@ type PerformLeaveResponse struct {
}
// Handle an instruction to make_leave & send_leave with a remote server.
func (h *httpFederationSenderInternalAPI) PerformLeaveRequest(
func (h *httpFederationSenderInternalAPI) PerformLeave(
ctx context.Context,
request *PerformLeaveRequest,
response *PerformLeaveResponse,

9
federationsender/federationsender.go
View file

@ -36,6 +36,7 @@ func SetupFederationSenderComponent(
federation *gomatrixserverlib.FederationClient,
rsQueryAPI roomserverAPI.RoomserverQueryAPI,
rsInputAPI roomserverAPI.RoomserverInputAPI,
keyRing *gomatrixserverlib.KeyRing,
) api.FederationSenderInternalAPI {
federationSenderDB, err := storage.NewDatabase(string(base.Cfg.Database.FederationSender))
if err != nil {
@ -61,10 +62,10 @@ func SetupFederationSenderComponent(
logrus.WithError(err).Panic("failed to start typing server consumer")
}
queryAPI := query.FederationSenderInternalAPI{
DB: federationSenderDB,
}
queryAPI := query.NewFederationSenderInternalAPI(
federationSenderDB, base.Cfg, roomserverProducer, federation, keyRing,
)
queryAPI.SetupHTTP(http.DefaultServeMux)
return &queryAPI
return queryAPI
}

36
federationsender/producers/roomserver.go
View file

@ -54,6 +54,42 @@ func (c *RoomserverProducer) SendInviteResponse(
return c.SendInputRoomEvents(ctx, []api.InputRoomEvent{ire})
}
// SendEventWithState writes an event with KindNew to the roomserver input log
// with the state at the event as KindOutlier before it.
func (c *RoomserverProducer) SendEventWithState(
ctx context.Context, state gomatrixserverlib.RespState, event gomatrixserverlib.HeaderedEvent,
) error {
outliers, err := state.Events()
if err != nil {
return err
}
var ires []api.InputRoomEvent
for _, outlier := range outliers {
ires = append(ires, api.InputRoomEvent{
Kind: api.KindOutlier,
Event: outlier.Headered(event.RoomVersion),
AuthEventIDs: outlier.AuthEventIDs(),
})
}
stateEventIDs := make([]string, len(state.StateEvents))
for i := range state.StateEvents {
stateEventIDs[i] = state.StateEvents[i].EventID()
}
ires = append(ires, api.InputRoomEvent{
Kind: api.KindNew,
Event: event,
AuthEventIDs: event.AuthEventIDs(),
HasState: true,
StateEventIDs: stateEventIDs,
})
_, err = c.SendInputRoomEvents(ctx, ires)
return err
}
// SendInputRoomEvents writes the given input room events to the roomserver input API.
func (c *RoomserverProducer) SendInputRoomEvents(
ctx context.Context, ires []api.InputRoomEvent,

30
federationsender/query/api.go
View file

@ -5,17 +5,37 @@ import (
"net/http"
"github.com/matrix-org/dendrite/common"
"github.com/matrix-org/dendrite/common/config"
"github.com/matrix-org/dendrite/federationsender/api"
"github.com/matrix-org/dendrite/federationsender/producers"
"github.com/matrix-org/dendrite/federationsender/storage"
rsAPI "github.com/matrix-org/dendrite/roomserver/api"
"github.com/matrix-org/gomatrixserverlib"
"github.com/matrix-org/util"
)
// FederationSenderInternalAPI is an implementation of api.FederationSenderInternalAPI
type FederationSenderInternalAPI struct {
api.FederationSenderInternalAPI
DB storage.Database
RoomserverInputAPI rsAPI.RoomserverInputAPI
db storage.Database
cfg *config.Dendrite
producer *producers.RoomserverProducer
federation *gomatrixserverlib.FederationClient
keyRing *gomatrixserverlib.KeyRing
}
func NewFederationSenderInternalAPI(
db storage.Database, cfg *config.Dendrite,
producer *producers.RoomserverProducer,
federation *gomatrixserverlib.FederationClient,
keyRing *gomatrixserverlib.KeyRing,
) *FederationSenderInternalAPI {
return &FederationSenderInternalAPI{
db: db,
cfg: cfg,
producer: producer,
federation: federation,
keyRing: keyRing,
}
}
// SetupHTTP adds the FederationSenderInternalAPI handlers to the http.ServeMux.
@ -55,7 +75,7 @@ func (f *FederationSenderInternalAPI) SetupHTTP(servMux *http.ServeMux) {
if err := json.NewDecoder(req.Body).Decode(&request); err != nil {
return util.MessageResponse(http.StatusBadRequest, err.Error())
}
if err := f.PerformJoinRequest(req.Context(), &request, &response); err != nil {
if err := f.PerformJoin(req.Context(), &request, &response); err != nil {
return util.ErrorResponse(err)
}
return util.JSONResponse{Code: http.StatusOK, JSON: &response}
@ -68,7 +88,7 @@ func (f *FederationSenderInternalAPI) SetupHTTP(servMux *http.ServeMux) {
if err := json.NewDecoder(req.Body).Decode(&request); err != nil {
return util.MessageResponse(http.StatusBadRequest, err.Error())
}
if err := f.PerformLeaveRequest(req.Context(), &request, &response); err != nil {
if err := f.PerformLeave(req.Context(), &request, &response); err != nil {
return util.ErrorResponse(err)
}
return util.JSONResponse{Code: http.StatusOK, JSON: &response}

99
federationsender/query/perform.go
View file

@ -2,21 +2,116 @@ package query
import (
"context"
"fmt"
"time"
"github.com/matrix-org/dendrite/federationsender/api"
"github.com/matrix-org/dendrite/federationsender/query/perform"
"github.com/matrix-org/dendrite/roomserver/version"
"github.com/matrix-org/gomatrixserverlib"
)
// PerformJoinRequest implements api.FederationSenderInternalAPI
func (r *FederationSenderInternalAPI) PerformJoinRequest(
func (r *FederationSenderInternalAPI) PerformJoin(
ctx context.Context,
request *api.PerformJoinRequest,
response *api.PerformJoinResponse,
) (err error) {
// Look up the supported room versions.
var supportedVersions []gomatrixserverlib.RoomVersion
for version := range version.SupportedRoomVersions() {
supportedVersions = append(supportedVersions, version)
}
// Try to perform a make_join using the information supplied in the
// request.
respMakeJoin, err := r.federation.MakeJoin(
ctx,
request.ServerName,
request.RoomID,
request.UserID,
supportedVersions,
)
if err != nil {
// TODO: Check if the user was not allowed to join the room.
return fmt.Errorf("r.federation.MakeJoin: %w", err)
}
// Set all the fields to be what they should be, this should be a no-op
// but it's possible that the remote server returned us something "odd"
respMakeJoin.JoinEvent.Type = "m.room.member"
respMakeJoin.JoinEvent.Sender = request.UserID
respMakeJoin.JoinEvent.StateKey = &request.UserID
respMakeJoin.JoinEvent.RoomID = request.RoomID
respMakeJoin.JoinEvent.Redacts = ""
if request.Content == nil {
request.Content = map[string]interface{}{}
}
request.Content["membership"] = "join"
if err = respMakeJoin.JoinEvent.SetContent(request.Content); err != nil {
return fmt.Errorf("respMakeJoin.JoinEvent.SetContent: %w", err)
}
if err = respMakeJoin.JoinEvent.SetUnsigned(struct{}{}); err != nil {
return fmt.Errorf("respMakeJoin.JoinEvent.SetUnsigned: %w", err)
}
// Work out if we support the room version that has been supplied in
// the make_join response.
if respMakeJoin.RoomVersion == "" {
respMakeJoin.RoomVersion = gomatrixserverlib.RoomVersionV1
}
if _, err = respMakeJoin.RoomVersion.EventFormat(); err != nil {
return fmt.Errorf("respMakeJoin.RoomVersion.EventFormat: %w", err)
}
// Build the join event.
event, err := respMakeJoin.JoinEvent.Build(
time.Now(),
r.cfg.Matrix.ServerName,
r.cfg.Matrix.KeyID,
r.cfg.Matrix.PrivateKey,
respMakeJoin.RoomVersion,
)
if err != nil {
return fmt.Errorf("respMakeJoin.JoinEvent.Build: %w", err)
}
// Try to perform a send_join using the newly built event.
respSendJoin, err := r.federation.SendJoin(
ctx,
request.ServerName,
event,
respMakeJoin.RoomVersion,
)
if err != nil {
return fmt.Errorf("r.federation.SendJoin: %w", err)
}
// Check that the send_join response was valid.
joinCtx := perform.JoinContext(r.federation, r.keyRing)
if err = joinCtx.CheckSendJoinResponse(
ctx, event, request.ServerName, respMakeJoin, respSendJoin,
); err != nil {
return fmt.Errorf("perform.JoinRequest.CheckSendJoinResponse: %w", err)
}
// If we successfully performed a send_join above then the other
// server now thinks we're a part of the room. Send the newly
// returned state to the roomserver to update our local view.
if err = r.producer.SendEventWithState(
ctx,
respSendJoin.ToRespState(),
event.Headered(respMakeJoin.RoomVersion),
); err != nil {
return fmt.Errorf("r.producer.SendEventWithState: %w", err)
}
// Everything went to plan.
return nil
}
// PerformLeaveRequest implements api.FederationSenderInternalAPI
func (r *FederationSenderInternalAPI) PerformLeaveRequest(
func (r *FederationSenderInternalAPI) PerformLeave(
ctx context.Context,
request *api.PerformLeaveRequest,
response *api.PerformLeaveResponse,

70
federationsender/query/perform/join.go Normal file
View file

@ -0,0 +1,70 @@
package perform
import (
"context"
"fmt"
"github.com/matrix-org/gomatrixserverlib"
)
// This file contains helpers for the PerformJoin function.
type joinContext struct {
federation *gomatrixserverlib.FederationClient
keyRing *gomatrixserverlib.KeyRing
}
// Returns a new join context.
func JoinContext(f *gomatrixserverlib.FederationClient, k *gomatrixserverlib.KeyRing) *joinContext {
return &joinContext{
federation: f,
keyRing: k,
}
}
// checkSendJoinResponse checks that all of the signatures are correct
// and that the join is allowed by the supplied state.
func (r joinContext) CheckSendJoinResponse(
ctx context.Context,
event gomatrixserverlib.Event,
server gomatrixserverlib.ServerName,
respMakeJoin gomatrixserverlib.RespMakeJoin,
respSendJoin gomatrixserverlib.RespSendJoin,
) error {
// A list of events that we have retried, if they were not included in
// the auth events supplied in the send_join.
retries := map[string]bool{}
retryCheck:
// TODO: Can we expand Check here to return a list of missing auth
// events rather than failing one at a time?
if err := respSendJoin.Check(ctx, r.keyRing, event); err != nil {
switch e := err.(type) {
case gomatrixserverlib.MissingAuthEventError:
// Check that we haven't already retried for this event, prevents
// us from ending up in endless loops
if !retries[e.AuthEventID] {
// Ask the server that we're talking to right now for the event
tx, txerr := r.federation.GetEvent(ctx, server, e.AuthEventID)
if txerr != nil {
return fmt.Errorf("r.federation.GetEvent: %w", txerr)
}
// For each event returned, add it to the auth events.
for _, pdu := range tx.PDUs {
ev, everr := gomatrixserverlib.NewEventFromUntrustedJSON(pdu, respMakeJoin.RoomVersion)
if everr != nil {
return fmt.Errorf("gomatrixserverlib.NewEventFromUntrustedJSON: %w", everr)
}
respSendJoin.AuthEvents = append(respSendJoin.AuthEvents, ev)
}
// Mark the event as retried and then give the check another go.
retries[e.AuthEventID] = true
goto retryCheck
}
return fmt.Errorf("respSendJoin (after retries): %w", e)
default:
return fmt.Errorf("respSendJoin: %w", err)
}
}
return nil
}

4
federationsender/query/query.go
View file

@ -13,7 +13,7 @@ func (f *FederationSenderInternalAPI) QueryJoinedHostsInRoom(
request *api.QueryJoinedHostsInRoomRequest,
response *api.QueryJoinedHostsInRoomResponse,
) (err error) {
response.JoinedHosts, err = f.DB.GetJoinedHosts(ctx, request.RoomID)
response.JoinedHosts, err = f.db.GetJoinedHosts(ctx, request.RoomID)
return
}
@ -23,7 +23,7 @@ func (f *FederationSenderInternalAPI) QueryJoinedHostServerNamesInRoom(
request *api.QueryJoinedHostServerNamesInRoomRequest,
response *api.QueryJoinedHostServerNamesInRoomResponse,
) (err error) {
joinedHosts, err := f.DB.GetJoinedHosts(ctx, request.RoomID)
joinedHosts, err := f.db.GetJoinedHosts(ctx, request.RoomID)
if err != nil {
return
}