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sync_send_remote.go
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sync_send_remote.go
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// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
// See LICENSE.txt for license information.
package sharedchannel
import (
"context"
"encoding/json"
"fmt"
"sync"
"github.com/wiggin77/merror"
"github.com/mattermost/mattermost-server/v5/model"
"github.com/mattermost/mattermost-server/v5/services/remotecluster"
"github.com/mattermost/mattermost-server/v5/shared/mlog"
)
type sendSyncMsgResultFunc func(syncResp SyncResponse, err error)
type attachment struct {
fi *model.FileInfo
post *model.Post
}
type syncData struct {
task syncTask
rc *model.RemoteCluster
scr *model.SharedChannelRemote
users map[string]*model.User
profileImages map[string]*model.User
posts []*model.Post
reactions []*model.Reaction
attachments []attachment
resultRepeat bool
resultNextCursor model.GetPostsSinceForSyncCursor
}
func newSyncData(task syncTask, rc *model.RemoteCluster, scr *model.SharedChannelRemote) *syncData {
return &syncData{
task: task,
rc: rc,
scr: scr,
users: make(map[string]*model.User),
profileImages: make(map[string]*model.User),
resultNextCursor: model.GetPostsSinceForSyncCursor{LastPostUpdateAt: scr.LastPostUpdateAt, LastPostId: scr.LastPostId},
}
}
func (sd *syncData) isEmpty() bool {
return len(sd.users) == 0 && len(sd.profileImages) == 0 && len(sd.posts) == 0 && len(sd.reactions) == 0 && len(sd.attachments) == 0
}
func (sd *syncData) isCursorChanged() bool {
return sd.scr.LastPostUpdateAt != sd.resultNextCursor.LastPostUpdateAt || sd.scr.LastPostId != sd.resultNextCursor.LastPostId
}
// syncForRemote updates a remote cluster with any new posts/reactions for a specific
// channel. If many changes are found, only the oldest X changes are sent and the channel
// is re-added to the task map. This ensures no channels are starved for updates even if some
// channels are very active.
// Returning an error forces a retry on the task.
func (scs *Service) syncForRemote(task syncTask, rc *model.RemoteCluster) error {
rcs := scs.server.GetRemoteClusterService()
if rcs == nil {
return fmt.Errorf("cannot update remote cluster %s for channel id %s; Remote Cluster Service not enabled", rc.Name, task.channelID)
}
scr, err := scs.server.GetStore().SharedChannel().GetRemoteByIds(task.channelID, rc.RemoteId)
if err != nil {
return err
}
// if this is retrying a failed msg, just send it again.
if task.retryMsg != nil {
sd := newSyncData(task, rc, scr)
sd.users = task.retryMsg.Users
sd.posts = task.retryMsg.Posts
sd.reactions = task.retryMsg.Reactions
return scs.sendSyncData(sd)
}
sd := newSyncData(task, rc, scr)
// schedule another sync if the repeat flag is set at some point.
defer func(rpt *bool) {
if *rpt {
scs.addTask(newSyncTask(task.channelID, task.remoteID, nil))
}
}(&sd.resultRepeat)
// fetch new posts or retry post.
if err := scs.fetchPostsForSync(sd); err != nil {
return fmt.Errorf("cannot fetch posts for sync %v: %w", sd, err)
}
if !rc.IsOnline() {
if len(sd.posts) != 0 {
scs.notifyRemoteOffline(sd.posts, rc)
}
sd.resultRepeat = false
return nil
}
// fetch users that have updated their user profile or image.
if err := scs.fetchUsersForSync(sd); err != nil {
return fmt.Errorf("cannot fetch users for sync %v: %w", sd, err)
}
// fetch reactions for posts
if err := scs.fetchReactionsForSync(sd); err != nil {
return fmt.Errorf("cannot fetch reactions for sync %v: %w", sd, err)
}
// fetch users associated with posts & reactions
if err := scs.fetchPostUsersForSync(sd); err != nil {
return fmt.Errorf("cannot fetch post users for sync %v: %w", sd, err)
}
// filter out any posts that don't need to be sent.
scs.filterPostsForSync(sd)
// fetch attachments for posts
if err := scs.fetchPostAttachmentsForSync(sd); err != nil {
return fmt.Errorf("cannot fetch post attachments for sync %v: %w", sd, err)
}
if sd.isEmpty() {
scs.server.GetLogger().Log(mlog.LvlSharedChannelServiceDebug, "Not sending sync data; everything filtered out",
mlog.String("remote", rc.DisplayName),
mlog.String("channel_id", task.channelID),
mlog.Bool("repeat", sd.resultRepeat),
)
if sd.isCursorChanged() {
scs.updateCursorForRemote(sd.scr.Id, sd.rc, sd.resultNextCursor)
}
return nil
}
scs.server.GetLogger().Log(mlog.LvlSharedChannelServiceDebug, "Sending sync data",
mlog.String("remote", rc.DisplayName),
mlog.String("channel_id", task.channelID),
mlog.Bool("repeat", sd.resultRepeat),
mlog.Int("users", len(sd.users)),
mlog.Int("images", len(sd.profileImages)),
mlog.Int("posts", len(sd.posts)),
mlog.Int("reactions", len(sd.reactions)),
mlog.Int("attachments", len(sd.attachments)),
)
return scs.sendSyncData(sd)
}
// fetchUsersForSync populates the sync data with any channel users who updated their user profile
// since the last sync.
func (scs *Service) fetchUsersForSync(sd *syncData) error {
filter := model.GetUsersForSyncFilter{
ChannelID: sd.task.channelID,
Limit: MaxUsersPerSync,
}
users, err := scs.server.GetStore().SharedChannel().GetUsersForSync(filter)
if err != nil {
return err
}
for _, u := range users {
if u.GetRemoteID() != sd.rc.RemoteId {
sd.users[u.Id] = u
}
}
filter.CheckProfileImage = true
usersImage, err := scs.server.GetStore().SharedChannel().GetUsersForSync(filter)
if err != nil {
return err
}
for _, u := range usersImage {
if u.GetRemoteID() != sd.rc.RemoteId {
sd.profileImages[u.Id] = u
}
}
return nil
}
// fetchPostsForSync populates the sync data with any new posts since the last sync.
func (scs *Service) fetchPostsForSync(sd *syncData) error {
options := model.GetPostsSinceForSyncOptions{
ChannelId: sd.task.channelID,
IncludeDeleted: true,
}
cursor := model.GetPostsSinceForSyncCursor{
LastPostUpdateAt: sd.scr.LastPostUpdateAt,
LastPostId: sd.scr.LastPostId,
}
posts, nextCursor, err := scs.server.GetStore().Post().GetPostsSinceForSync(options, cursor, MaxPostsPerSync)
if err != nil {
return fmt.Errorf("could not fetch new posts for sync: %w", err)
}
// Append the posts individually, checking for root posts that might appear later in the list.
// This is due to the UpdateAt collision handling algorithm where the order of posts is not based
// on UpdateAt or CreateAt when the posts have the same UpdateAt value. Here we are guarding
// against a root post with the same UpdateAt (and probably the same CreateAt) appearing later
// in the list and must be sync'd before the child post. This is and edge case that likely only
// happens during load testing or bulk imports.
for _, p := range posts {
if p.RootId != "" {
root, err := scs.server.GetStore().Post().GetSingle(p.RootId, true)
if err == nil {
if (root.CreateAt >= cursor.LastPostUpdateAt || root.UpdateAt >= cursor.LastPostUpdateAt) && !containsPost(sd.posts, root) {
sd.posts = append(sd.posts, root)
}
}
}
sd.posts = append(sd.posts, p)
}
sd.resultNextCursor = nextCursor
sd.resultRepeat = len(posts) == MaxPostsPerSync
return nil
}
func containsPost(posts []*model.Post, post *model.Post) bool {
for _, p := range posts {
if p.Id == post.Id {
return true
}
}
return false
}
// fetchReactionsForSync populates the sync data with any new reactions since the last sync.
func (scs *Service) fetchReactionsForSync(sd *syncData) error {
merr := merror.New()
for _, post := range sd.posts {
// any reactions originating from the remote cluster are filtered out
reactions, err := scs.server.GetStore().Reaction().GetForPostSince(post.Id, sd.scr.LastPostUpdateAt, sd.rc.RemoteId, true)
if err != nil {
merr.Append(fmt.Errorf("could not get reactions for post %s: %w", post.Id, err))
continue
}
sd.reactions = append(sd.reactions, reactions...)
}
return merr.ErrorOrNil()
}
// fetchPostUsersForSync populates the sync data with all users associated with posts.
func (scs *Service) fetchPostUsersForSync(sd *syncData) error {
sc, err := scs.server.GetStore().SharedChannel().Get(sd.task.channelID)
if err != nil {
return fmt.Errorf("cannot determine teamID: %w", err)
}
type p2mm struct {
post *model.Post
mentionMap model.UserMentionMap
}
userIDs := make(map[string]p2mm)
for _, reaction := range sd.reactions {
userIDs[reaction.UserId] = p2mm{}
}
for _, post := range sd.posts {
// add author
userIDs[post.UserId] = p2mm{}
// get mentions and users for each mention
mentionMap := scs.app.MentionsToTeamMembers(post.Message, sc.TeamId)
for _, userID := range mentionMap {
userIDs[userID] = p2mm{
post: post,
mentionMap: mentionMap,
}
}
}
merr := merror.New()
for userID, v := range userIDs {
user, err := scs.server.GetStore().User().Get(context.Background(), userID)
if err != nil {
merr.Append(fmt.Errorf("could not get user %s: %w", userID, err))
continue
}
sync, syncImage, err2 := scs.shouldUserSync(user, sd.task.channelID, sd.rc)
if err2 != nil {
merr.Append(fmt.Errorf("could not check should sync user %s: %w", userID, err))
continue
}
if sync {
sd.users[user.Id] = sanitizeUserForSync(user)
}
if syncImage {
sd.profileImages[user.Id] = sanitizeUserForSync(user)
}
// if this was a mention then put the real username in place of the username+remotename, but only
// when sending to the remote that the user belongs to.
if v.post != nil && user.RemoteId != nil && *user.RemoteId == sd.rc.RemoteId {
fixMention(v.post, v.mentionMap, user)
}
}
return merr.ErrorOrNil()
}
// fetchPostAttachmentsForSync populates the sync data with any file attachments for new posts.
func (scs *Service) fetchPostAttachmentsForSync(sd *syncData) error {
merr := merror.New()
for _, post := range sd.posts {
fis, err := scs.server.GetStore().FileInfo().GetForPost(post.Id, false, true, true)
if err != nil {
merr.Append(fmt.Errorf("could not get file attachment info for post %s: %w", post.Id, err))
continue
}
for _, fi := range fis {
if scs.shouldSyncAttachment(fi, sd.rc) {
sd.attachments = append(sd.attachments, attachment{fi: fi, post: post})
}
}
}
return merr.ErrorOrNil()
}
// filterPostsforSync removes any posts that do not need to sync.
func (scs *Service) filterPostsForSync(sd *syncData) {
filtered := make([]*model.Post, 0, len(sd.posts))
for _, p := range sd.posts {
// Don't resend an existing post where only the reactions changed.
// Posts we must send:
// - new posts (EditAt == 0)
// - edited posts (EditAt >= LastPostUpdateAt)
// - deleted posts (DeleteAt > 0)
if p.EditAt > 0 && p.EditAt < sd.scr.LastPostUpdateAt && p.DeleteAt == 0 {
continue
}
// Don't send a deleted post if it is just the original copy from an edit.
if p.DeleteAt > 0 && p.OriginalId != "" {
continue
}
// don't sync a post back to the remote it came from.
if p.GetRemoteID() == sd.rc.RemoteId {
continue
}
// parse out all permalinks in the message.
p.Message = scs.processPermalinkToRemote(p)
filtered = append(filtered, p)
}
sd.posts = filtered
}
// sendSyncData sends all the collected users, posts, reactions, images, and attachments to the
// remote cluster.
// The order of items sent is important: users -> attachments -> posts -> reactions -> profile images
func (scs *Service) sendSyncData(sd *syncData) error {
merr := merror.New()
// send users
if len(sd.users) != 0 {
if err := scs.sendUserSyncData(sd); err != nil {
merr.Append(fmt.Errorf("cannot send user sync data: %w", err))
}
}
// send attachments
if len(sd.attachments) != 0 {
scs.sendAttachmentSyncData(sd)
}
// send posts
if len(sd.posts) != 0 {
if err := scs.sendPostSyncData(sd); err != nil {
merr.Append(fmt.Errorf("cannot send post sync data: %w", err))
}
} else if sd.isCursorChanged() {
scs.updateCursorForRemote(sd.scr.Id, sd.rc, sd.resultNextCursor)
}
// send reactions
if len(sd.reactions) != 0 {
if err := scs.sendReactionSyncData(sd); err != nil {
merr.Append(fmt.Errorf("cannot send reaction sync data: %w", err))
}
}
// send user profile images
if len(sd.profileImages) != 0 {
scs.sendProfileImageSyncData(sd)
}
return merr.ErrorOrNil()
}
// sendUserSyncData sends the collected user updates to the remote cluster.
func (scs *Service) sendUserSyncData(sd *syncData) error {
msg := newSyncMsg(sd.task.channelID)
msg.Users = sd.users
err := scs.sendSyncMsgToRemote(msg, sd.rc, func(syncResp SyncResponse, errResp error) {
for _, userID := range syncResp.UsersSyncd {
if err := scs.server.GetStore().SharedChannel().UpdateUserLastSyncAt(userID, sd.task.channelID, sd.rc.RemoteId); err != nil {
scs.server.GetLogger().Log(mlog.LvlSharedChannelServiceError, "Cannot update shared channel user LastSyncAt",
mlog.String("user_id", userID),
mlog.String("channel_id", sd.task.channelID),
mlog.String("remote_id", sd.rc.RemoteId),
mlog.Err(err),
)
}
}
if len(syncResp.UserErrors) != 0 {
scs.server.GetLogger().Log(mlog.LvlSharedChannelServiceError, "Response indicates error for user(s) sync",
mlog.String("channel_id", sd.task.channelID),
mlog.String("remote_id", sd.rc.RemoteId),
mlog.Any("users", syncResp.UserErrors),
)
}
})
return err
}
// sendAttachmentSyncData sends the collected post updates to the remote cluster.
func (scs *Service) sendAttachmentSyncData(sd *syncData) {
for _, a := range sd.attachments {
if err := scs.sendAttachmentForRemote(a.fi, a.post, sd.rc); err != nil {
scs.server.GetLogger().Log(mlog.LvlSharedChannelServiceError, "Cannot sync post attachment",
mlog.String("post_id", a.post.Id),
mlog.String("channel_id", sd.task.channelID),
mlog.String("remote_id", sd.rc.RemoteId),
mlog.Err(err),
)
}
// updating SharedChannelAttachments with LastSyncAt is already done.
}
}
// sendPostSyncData sends the collected post updates to the remote cluster.
func (scs *Service) sendPostSyncData(sd *syncData) error {
msg := newSyncMsg(sd.task.channelID)
msg.Posts = sd.posts
return scs.sendSyncMsgToRemote(msg, sd.rc, func(syncResp SyncResponse, errResp error) {
if len(syncResp.PostErrors) != 0 {
scs.server.GetLogger().Log(mlog.LvlSharedChannelServiceError, "Response indicates error for post(s) sync",
mlog.String("channel_id", sd.task.channelID),
mlog.String("remote_id", sd.rc.RemoteId),
mlog.Any("posts", syncResp.PostErrors),
)
for _, postID := range syncResp.PostErrors {
scs.handlePostError(postID, sd.task, sd.rc)
}
}
scs.updateCursorForRemote(sd.scr.Id, sd.rc, sd.resultNextCursor)
})
}
// sendReactionSyncData sends the collected reaction updates to the remote cluster.
func (scs *Service) sendReactionSyncData(sd *syncData) error {
msg := newSyncMsg(sd.task.channelID)
msg.Reactions = sd.reactions
return scs.sendSyncMsgToRemote(msg, sd.rc, func(syncResp SyncResponse, errResp error) {
if len(syncResp.ReactionErrors) != 0 {
scs.server.GetLogger().Log(mlog.LvlSharedChannelServiceError, "Response indicates error for reactions(s) sync",
mlog.String("channel_id", sd.task.channelID),
mlog.String("remote_id", sd.rc.RemoteId),
mlog.Any("reaction_posts", syncResp.ReactionErrors),
)
}
})
}
// sendProfileImageSyncData sends the collected user profile image updates to the remote cluster.
func (scs *Service) sendProfileImageSyncData(sd *syncData) {
for _, user := range sd.profileImages {
scs.syncProfileImage(user, sd.task.channelID, sd.rc)
}
}
// sendSyncMsgToRemote synchronously sends the sync message to the remote cluster.
func (scs *Service) sendSyncMsgToRemote(msg *syncMsg, rc *model.RemoteCluster, f sendSyncMsgResultFunc) error {
rcs := scs.server.GetRemoteClusterService()
if rcs == nil {
return fmt.Errorf("cannot update remote cluster %s for channel id %s; Remote Cluster Service not enabled", rc.Name, msg.ChannelId)
}
b, err := json.Marshal(msg)
if err != nil {
return err
}
rcMsg := model.NewRemoteClusterMsg(TopicSync, b)
ctx, cancel := context.WithTimeout(context.Background(), remotecluster.SendTimeout)
defer cancel()
var wg sync.WaitGroup
wg.Add(1)
err = rcs.SendMsg(ctx, rcMsg, rc, func(rcMsg model.RemoteClusterMsg, rc *model.RemoteCluster, rcResp *remotecluster.Response, errResp error) {
defer wg.Done()
var syncResp SyncResponse
if err2 := json.Unmarshal(rcResp.Payload, &syncResp); err2 != nil {
scs.server.GetLogger().Log(mlog.LvlSharedChannelServiceError, "Invalid sync msg response from remote cluster",
mlog.String("remote", rc.Name),
mlog.String("channel_id", msg.ChannelId),
mlog.Err(err2),
)
return
}
if f != nil {
f(syncResp, errResp)
}
})
wg.Wait()
return err
}