MM-30882: Fix read-after-write issue for demoting user (#16911)

* MM-30882: Fix read-after-write issue for demoting user

In (*App).DemoteUserToGuest, we would demote a user, and then immediately
read it back to do future operations from the user. This reading back
of the user had the effect of sticking the old value into the cache
after which it would never be updated.

There was another issue along with this, which was when the invalidation
message would broadcast across the cluster, it would hit the cache invalidation
problem where an unrelated store call would miss the cache because
it was invalidated, and then again read from replica and stick the old value.

To fix all these, we return the new value directly from the store method
to avoid having the app to read it again.

And we add a map in the localcache layer which tracks invalidations made,
and then switch to use master if it's true.

The core change is fairly limited, but due to changing the store method signatures,
a lot of code needed to be updated to pass "context.Background". Therefore the PR
just "appears" to be big, but the main changes are limited to app/user.go,
sqlstore/user_store.go and user_layer.go

https://mattermost.atlassian.net/browse/MM-30882

```release-note
Fix an issue where demoting a user to guest would not take effect in
an environment with read replicas.
```

* Fix concurrent map access

* Fixing mistakes

* fix tests

app/bot.go

@@ -4,6 +4,7 @@
 package app
 
 import (
+	"context"
 	"errors"
 	"fmt"
 	"io"
@@ -55,7 +56,7 @@ func (a *App) CreateBot(bot *model.Bot) (*model.Bot, *model.AppError) {
 	}
 
 	// Get the owner of the bot, if one exists. If not, don't send a message
-	ownerUser, err := a.Srv().Store.User().Get(bot.OwnerId)
+	ownerUser, err := a.Srv().Store.User().Get(context.Background(), bot.OwnerId)
 	var nfErr *store.ErrNotFound
 	if err != nil && !errors.As(err, &nfErr) {
 		return nil, model.NewAppError("CreateBot", "app.user.get.app_error", nil, err.Error(), http.StatusInternalServerError)
@@ -156,7 +157,7 @@ func (a *App) PatchBot(botUserId string, botPatch *model.BotPatch) (*model.Bot,
 
 	bot.Patch(botPatch)
 
-	user, nErr := a.Srv().Store.User().Get(botUserId)
+	user, nErr := a.Srv().Store.User().Get(context.Background(), botUserId)
 	if nErr != nil {
 		var nfErr *store.ErrNotFound
 		switch {
@@ -233,7 +234,7 @@ func (a *App) GetBots(options *model.BotGetOptions) (model.BotList, *model.AppEr
 
 // UpdateBotActive marks a bot as active or inactive, along with its corresponding user.
 func (a *App) UpdateBotActive(botUserId string, active bool) (*model.Bot, *model.AppError) {
-	user, nErr := a.Srv().Store.User().Get(botUserId)
+	user, nErr := a.Srv().Store.User().Get(context.Background(), botUserId)
 	if nErr != nil {
 		var nfErr *store.ErrNotFound
 		switch {

app/channel.go

@@ -4,6 +4,7 @@
 package app
 
 import (
+	"context"
 	"errors"
 	"fmt"
 	"net/http"
@@ -67,7 +68,7 @@ func (a *App) JoinDefaultChannels(teamID string, user *model.User, shouldBeAdmin
 	var requestor *model.User
 	var nErr error
 	if userRequestorId != "" {
-		requestor, nErr = a.Srv().Store.User().Get(userRequestorId)
+		requestor, nErr = a.Srv().Store.User().Get(context.Background(), userRequestorId)
 		if nErr != nil {
 			var nfErr *store.ErrNotFound
 			switch {
@@ -264,7 +265,7 @@ func (a *App) CreateChannel(channel *model.Channel, addMember bool) (*model.Chan
 	}
 
 	if addMember {
-		user, nErr := a.Srv().Store.User().Get(channel.CreatorId)
+		user, nErr := a.Srv().Store.User().Get(context.Background(), channel.CreatorId)
 		if nErr != nil {
 			var nfErr *store.ErrNotFound
 			switch {
@@ -386,7 +387,7 @@ func (a *App) handleCreationEvent(userID, otherUserID string, channel *model.Cha
 }
 
 func (a *App) createDirectChannel(userID, otherUserID string) (*model.Channel, *model.AppError) {
-	users, err := a.Srv().Store.User().GetMany([]string{userID, otherUserID})
+	users, err := a.Srv().Store.User().GetMany(context.Background(), []string{userID, otherUserID})
 	if err != nil {
 		return nil, model.NewAppError("CreateDirectChannel", "api.channel.create_direct_channel.invalid_user.app_error", nil, err.Error(), http.StatusBadRequest)
 	}
@@ -520,7 +521,7 @@ func (a *App) createGroupChannel(userIDs []string) (*model.Channel, *model.AppEr
 		return nil, model.NewAppError("CreateGroupChannel", "api.channel.create_group.bad_size.app_error", nil, "", http.StatusBadRequest)
 	}
 
-	users, err := a.Srv().Store.User().GetProfileByIds(userIDs, nil, true)
+	users, err := a.Srv().Store.User().GetProfileByIds(context.Background(), userIDs, nil, true)
 	if err != nil {
 		return nil, model.NewAppError("createGroupChannel", "app.user.get_profiles.app_error", nil, err.Error(), http.StatusInternalServerError)
 	}
@@ -599,7 +600,7 @@ func (a *App) GetGroupChannel(userIDs []string) (*model.Channel, *model.AppError
 		return nil, model.NewAppError("GetGroupChannel", "api.channel.create_group.bad_size.app_error", nil, "", http.StatusBadRequest)
 	}
 
-	users, err := a.Srv().Store.User().GetProfileByIds(userIDs, nil, true)
+	users, err := a.Srv().Store.User().GetProfileByIds(context.Background(), userIDs, nil, true)
 	if err != nil {
 		return nil, model.NewAppError("GetGroupChannel", "app.user.get_profiles.app_error", nil, err.Error(), http.StatusInternalServerError)
 	}
@@ -745,7 +746,7 @@ func (a *App) RestoreChannel(channel *model.Channel, userID string) (*model.Chan
 	message.Add("channel_id", channel.Id)
 	a.Publish(message)
 
-	user, nErr := a.Srv().Store.User().Get(userID)
+	user, nErr := a.Srv().Store.User().Get(context.Background(), userID)
 	if nErr != nil {
 		var nfErr *store.ErrNotFound
 		switch {
@@ -1236,7 +1237,7 @@ func (a *App) DeleteChannel(channel *model.Channel, userID string) *model.AppErr
 	var user *model.User
 	if userID != "" {
 		var nErr error
-		user, nErr = a.Srv().Store.User().Get(userID)
+		user, nErr = a.Srv().Store.User().Get(context.Background(), userID)
 		if nErr != nil {
 			var nfErr *store.ErrNotFound
 			switch {
@@ -1492,7 +1493,7 @@ func (a *App) AddDirectChannels(teamID string, user *model.User) *model.AppError
 }
 
 func (a *App) PostUpdateChannelHeaderMessage(userID string, channel *model.Channel, oldChannelHeader, newChannelHeader string) *model.AppError {
-	user, err := a.Srv().Store.User().Get(userID)
+	user, err := a.Srv().Store.User().Get(context.Background(), userID)
 	if err != nil {
 		return model.NewAppError("PostUpdateChannelHeaderMessage", "api.channel.post_update_channel_header_message_and_forget.retrieve_user.error", nil, err.Error(), http.StatusBadRequest)
 	}
@@ -1526,7 +1527,7 @@ func (a *App) PostUpdateChannelHeaderMessage(userID string, channel *model.Chann
 }
 
 func (a *App) PostUpdateChannelPurposeMessage(userID string, channel *model.Channel, oldChannelPurpose string, newChannelPurpose string) *model.AppError {
-	user, err := a.Srv().Store.User().Get(userID)
+	user, err := a.Srv().Store.User().Get(context.Background(), userID)
 	if err != nil {
 		return model.NewAppError("PostUpdateChannelPurposeMessage", "app.channel.post_update_channel_purpose_message.retrieve_user.error", nil, err.Error(), http.StatusBadRequest)
 	}
@@ -1559,7 +1560,7 @@ func (a *App) PostUpdateChannelPurposeMessage(userID string, channel *model.Chan
 }
 
 func (a *App) PostUpdateChannelDisplayNameMessage(userID string, channel *model.Channel, oldChannelDisplayName, newChannelDisplayName string) *model.AppError {
-	user, err := a.Srv().Store.User().Get(userID)
+	user, err := a.Srv().Store.User().Get(context.Background(), userID)
 	if err != nil {
 		return model.NewAppError("PostUpdateChannelDisplayNameMessage", "api.channel.post_update_channel_displayname_message_and_forget.retrieve_user.error", nil, err.Error(), http.StatusBadRequest)
 	}
@@ -1905,7 +1906,7 @@ func (a *App) JoinChannel(channel *model.Channel, userID string) *model.AppError
 	userChan := make(chan store.StoreResult, 1)
 	memberChan := make(chan store.StoreResult, 1)
 	go func() {
-		user, err := a.Srv().Store.User().Get(userID)
+		user, err := a.Srv().Store.User().Get(context.Background(), userID)
 		userChan <- store.StoreResult{Data: user, NErr: err}
 		close(userChan)
 	}()
@@ -2014,7 +2015,7 @@ func (a *App) LeaveChannel(channelId string, userID string) *model.AppError {
 
 	uc := make(chan store.StoreResult, 1)
 	go func() {
-		user, err := a.Srv().Store.User().Get(userID)
+		user, err := a.Srv().Store.User().Get(context.Background(), userID)
 		uc <- store.StoreResult{Data: user, NErr: err}
 		close(uc)
 	}()
@@ -2176,7 +2177,7 @@ func (a *App) postRemoveFromChannelMessage(removerUserId string, removedUser *mo
 }
 
 func (a *App) removeUserFromChannel(userIDToRemove string, removerUserId string, channel *model.Channel) *model.AppError {
-	user, nErr := a.Srv().Store.User().Get(userIDToRemove)
+	user, nErr := a.Srv().Store.User().Get(context.Background(), userIDToRemove)
 	if nErr != nil {
 		var nfErr *store.ErrNotFound
 		switch {

app/channel_test.go

@@ -4,6 +4,7 @@
 package app
 
 import (
+	"context"
 	"fmt"
 	"net/http"
 	"sort"
@@ -1910,7 +1911,7 @@ func TestMarkChannelsAsViewedPanic(t *testing.T) {
 
 	mockStore := th.App.Srv().Store.(*mocks.Store)
 	mockUserStore := mocks.UserStore{}
-	mockUserStore.On("Get", "userID").Return(nil, model.NewAppError("SqlUserStore.Get", "app.user.get.app_error", nil, "user_id=userID", http.StatusInternalServerError))
+	mockUserStore.On("Get", context.Background(), "userID").Return(nil, model.NewAppError("SqlUserStore.Get", "app.user.get.app_error", nil, "user_id=userID", http.StatusInternalServerError))
 	mockChannelStore := mocks.ChannelStore{}
 	mockChannelStore.On("Get", "channelID", true).Return(&model.Channel{}, nil)
 	mockChannelStore.On("GetMember", "channelID", "userID").Return(&model.ChannelMember{

app/command.go

@@ -4,6 +4,7 @@
 package app
 
 import (
+	"context"
 	"errors"
 	"io"
 	"io/ioutil"
@@ -368,7 +369,7 @@ func (a *App) tryExecuteCustomCommand(args *model.CommandArgs, trigger string, m
 
 	userChan := make(chan store.StoreResult, 1)
 	go func() {
-		user, err := a.Srv().Store.User().Get(args.UserId)
+		user, err := a.Srv().Store.User().Get(context.Background(), args.UserId)
 		userChan <- store.StoreResult{Data: user, NErr: err}
 		close(userChan)
 	}()

app/email_batching.go

@@ -4,6 +4,7 @@
 package app
 
 import (
+	"context"
 	"fmt"
 	"html/template"
 	"net/http"
@@ -194,7 +195,7 @@ func (job *EmailBatchingJob) checkPendingNotifications(now time.Time, handler fu
 }
 
 func (es *EmailService) sendBatchedEmailNotification(userID string, notifications []*batchedNotification) {
-	user, err := es.srv.Store.User().Get(userID)
+	user, err := es.srv.Store.User().Get(context.Background(), userID)
 	if err != nil {
 		mlog.Warn("Unable to find recipient for batched email notification")
 		return
@@ -205,7 +206,7 @@ func (es *EmailService) sendBatchedEmailNotification(userID string, notification
 
 	var contents string
 	for _, notification := range notifications {
-		sender, err := es.srv.Store.User().Get(notification.post.UserId)
+		sender, err := es.srv.Store.User().Get(context.Background(), notification.post.UserId)
 		if err != nil {
 			mlog.Warn("Unable to find sender of post for batched email notification")
 			continue

app/export.go

@@ -5,6 +5,7 @@ package app
 
 import (
 	"archive/zip"
+	"context"
 	"encoding/json"
 	"io"
 	"net/http"
@@ -483,7 +484,7 @@ func (a *App) BuildPostReactions(postId string) (*[]ReactionImportData, *model.A
 	}
 
 	for _, reaction := range reactions {
-		user, err := a.Srv().Store.User().Get(reaction.UserId)
+		user, err := a.Srv().Store.User().Get(context.Background(), reaction.UserId)
 		if err != nil {
 			var nfErr *store.ErrNotFound
 			if errors.As(err, &nfErr) { // this is a valid case, the user that reacted might've been deleted by now

app/integration_action.go

@@ -19,6 +19,7 @@ package app
 
 import (
 	"bytes"
+	"context"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -84,7 +85,7 @@ func (a *App) DoPostActionWithCookie(postId, actionId, userID, selectedOption st
 
 	userChan := make(chan store.StoreResult, 1)
 	go func() {
-		user, err := a.Srv().Store.User().Get(upstreamRequest.UserId)
+		user, err := a.Srv().Store.User().Get(context.Background(), upstreamRequest.UserId)
 		userChan <- store.StoreResult{Data: user, NErr: err}
 		close(userChan)
 	}()

app/notification.go

@@ -4,6 +4,7 @@
 package app
 
 import (
+	"context"
 	"net/http"
 	"sort"
 	"strconv"
@@ -28,7 +29,7 @@ func (a *App) SendNotifications(post *model.Post, team *model.Team, channel *mod
 
 	pchan := make(chan store.StoreResult, 1)
 	go func() {
-		props, err := a.Srv().Store.User().GetAllProfilesInChannel(channel.Id, true)
+		props, err := a.Srv().Store.User().GetAllProfilesInChannel(context.Background(), channel.Id, true)
 		pchan <- store.StoreResult{Data: props, NErr: err}
 		close(pchan)
 	}()

app/oauth.go

@@ -5,6 +5,7 @@ package app
 
 import (
 	"bytes"
+	"context"
 	b64 "encoding/base64"
 	"errors"
 	"fmt"
@@ -288,7 +289,7 @@ func (a *App) GetOAuthAccessTokenForCodeFlow(clientId, grantType, redirectUri, c
 			return nil, model.NewAppError("GetOAuthAccessToken", "api.oauth.get_access_token.redirect_uri.app_error", nil, "", http.StatusBadRequest)
 		}
 
-		user, nErr = a.Srv().Store.User().Get(authData.UserId)
+		user, nErr = a.Srv().Store.User().Get(context.Background(), authData.UserId)
 		if nErr != nil {
 			return nil, model.NewAppError("GetOAuthAccessToken", "api.oauth.get_access_token.internal_user.app_error", nil, "", http.StatusNotFound)
 		}
@@ -347,7 +348,7 @@ func (a *App) GetOAuthAccessTokenForCodeFlow(clientId, grantType, redirectUri, c
 			return nil, model.NewAppError("GetOAuthAccessToken", "api.oauth.get_access_token.refresh_token.app_error", nil, "", http.StatusNotFound)
 		}
 
-		user, nErr := a.Srv().Store.User().Get(accessData.UserId)
+		user, nErr := a.Srv().Store.User().Get(context.Background(), accessData.UserId)
 		if nErr != nil {
 			return nil, model.NewAppError("GetOAuthAccessToken", "api.oauth.get_access_token.internal_user.app_error", nil, "", http.StatusNotFound)
 		}

app/post.go

@@ -4,6 +4,7 @@
 package app
 
 import (
+	"context"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -53,7 +54,7 @@ func (a *App) CreatePostAsUser(post *model.Post, currentSessionId string, setOnl
 		}
 
 		if err.Id == "api.post.create_post.town_square_read_only" {
-			user, nErr := a.Srv().Store.User().Get(post.UserId)
+			user, nErr := a.Srv().Store.User().Get(context.Background(), post.UserId)
 			if nErr != nil {
 				var nfErr *store.ErrNotFound
 				switch {
@@ -191,7 +192,7 @@ func (a *App) CreatePost(post *model.Post, channel *model.Channel, triggerWebhoo
 		}()
 	}
 
-	user, nErr := a.Srv().Store.User().Get(post.UserId)
+	user, nErr := a.Srv().Store.User().Get(context.Background(), post.UserId)
 	if nErr != nil {
 		var nfErr *store.ErrNotFound
 		switch {

app/session.go

@@ -4,6 +4,7 @@
 package app
 
 import (
+	"context"
 	"errors"
 	"fmt"
 	"math"
@@ -427,7 +428,7 @@ func (a *App) SetSessionExpireInDays(session *model.Session, days int) {
 
 func (a *App) CreateUserAccessToken(token *model.UserAccessToken) (*model.UserAccessToken, *model.AppError) {
 
-	user, nErr := a.Srv().Store.User().Get(token.UserId)
+	user, nErr := a.Srv().Store.User().Get(context.Background(), token.UserId)
 	if nErr != nil {
 		var nfErr *store.ErrNotFound
 		switch {
@@ -476,7 +477,7 @@ func (a *App) createSessionForUserAccessToken(tokenString string) (*model.Sessio
 		return nil, model.NewAppError("createSessionForUserAccessToken", "app.user_access_token.invalid_or_missing", nil, "inactive_token", http.StatusUnauthorized)
 	}
 
-	user, nErr := a.Srv().Store.User().Get(token.UserId)
+	user, nErr := a.Srv().Store.User().Get(context.Background(), token.UserId)
 	if nErr != nil {
 		var nfErr *store.ErrNotFound
 		switch {

app/slack.go

@@ -5,6 +5,7 @@ package app
 
 import (
 	"bytes"
+	"context"
 	"fmt"
 	"mime/multipart"
 	"regexp"
@@ -88,7 +89,7 @@ func replaceUserIds(userStore store.UserStore, text string) string {
 			userIDs = append(userIDs, match[1])
 		}
 
-		if users, err := userStore.GetProfileByIds(userIDs, nil, true); err == nil {
+		if users, err := userStore.GetProfileByIds(context.Background(), userIDs, nil, true); err == nil {
 			for _, user := range users {
 				text = strings.Replace(text, "<@"+user.Id+">", "@"+user.Username, -1)
 			}

app/team.go

@@ -489,7 +489,7 @@ func (a *App) AddUserToTeam(teamID string, userID string, userRequestorId string
 
 	uchan := make(chan store.StoreResult, 1)
 	go func() {
-		user, err := a.Srv().Store.User().Get(userID)
+		user, err := a.Srv().Store.User().Get(context.Background(), userID)
 		uchan <- store.StoreResult{Data: user, NErr: err}
 		close(uchan)
 	}()
@@ -566,7 +566,7 @@ func (a *App) AddUserToTeamByToken(userID string, tokenID string) (*model.Team,
 
 	uchan := make(chan store.StoreResult, 1)
 	go func() {
-		user, err := a.Srv().Store.User().Get(userID)
+		user, err := a.Srv().Store.User().Get(context.Background(), userID)
 		uchan <- store.StoreResult{Data: user, NErr: err}
 		close(uchan)
 	}()
@@ -641,7 +641,7 @@ func (a *App) AddUserToTeamByInviteId(inviteId string, userID string) (*model.Te
 
 	uchan := make(chan store.StoreResult, 1)
 	go func() {
-		user, err := a.Srv().Store.User().Get(userID)
+		user, err := a.Srv().Store.User().Get(context.Background(), userID)
 		uchan <- store.StoreResult{Data: user, NErr: err}
 		close(uchan)
 	}()
@@ -1163,7 +1163,7 @@ func (a *App) RemoveUserFromTeam(teamID string, userID string, requestorId strin
 
 	uchan := make(chan store.StoreResult, 1)
 	go func() {
-		user, err := a.Srv().Store.User().Get(userID)
+		user, err := a.Srv().Store.User().Get(context.Background(), userID)
 		uchan <- store.StoreResult{Data: user, NErr: err}
 		close(uchan)
 	}()
@@ -1206,7 +1206,7 @@ func (a *App) RemoveTeamMemberFromTeam(teamMember *model.TeamMember, requestorId
 	message.Add("team_id", teamMember.TeamId)
 	a.Publish(message)
 
-	user, nErr := a.Srv().Store.User().Get(teamMember.UserId)
+	user, nErr := a.Srv().Store.User().Get(context.Background(), teamMember.UserId)
 	if nErr != nil {
 		var nfErr *store.ErrNotFound
 		switch {
@@ -1368,7 +1368,7 @@ func (a *App) prepareInviteNewUsersToTeam(teamID, senderId string) (*model.User,
 
 	uchan := make(chan store.StoreResult, 1)
 	go func() {
-		user, err := a.Srv().Store.User().Get(senderId)
+		user, err := a.Srv().Store.User().Get(context.Background(), senderId)
 		uchan <- store.StoreResult{Data: user, NErr: err}
 		close(uchan)
 	}()
@@ -1499,7 +1499,7 @@ func (a *App) prepareInviteGuestsToChannels(teamID string, guestsInvite *model.G
 	}()
 	uchan := make(chan store.StoreResult, 1)
 	go func() {
-		user, err := a.Srv().Store.User().Get(senderId)
+		user, err := a.Srv().Store.User().Get(context.Background(), senderId)
 		uchan <- store.StoreResult{Data: user, NErr: err}
 		close(uchan)
 	}()

app/user.go

@@ -5,6 +5,7 @@ package app
 
 import (
 	"bytes"
+	"context"
 	b64 "encoding/base64"
 	"encoding/json"
 	"errors"
@@ -432,7 +433,7 @@ func (a *App) IsUsernameTaken(name string) bool {
 }
 
 func (a *App) GetUser(userID string) (*model.User, *model.AppError) {
-	user, err := a.Srv().Store.User().Get(userID)
+	user, err := a.Srv().Store.User().Get(context.Background(), userID)
 	if err != nil {
 		var nfErr *store.ErrNotFound
 		switch {
@@ -683,7 +684,7 @@ func (a *App) GetChannelGroupUsers(channelID string) ([]*model.User, *model.AppE
 func (a *App) GetUsersByIds(userIDs []string, options *store.UserGetByIdsOpts) ([]*model.User, *model.AppError) {
 	allowFromCache := options.ViewRestrictions == nil
 
-	users, err := a.Srv().Store.User().GetProfileByIds(userIDs, options, allowFromCache)
+	users, err := a.Srv().Store.User().GetProfileByIds(context.Background(), userIDs, options, allowFromCache)
 	if err != nil {
 		return nil, model.NewAppError("GetUsersByIds", "app.user.get_profiles.app_error", nil, err.Error(), http.StatusInternalServerError)
 	}
@@ -739,7 +740,7 @@ func (a *App) GenerateMfaSecret(userID string) (*model.MfaSecret, *model.AppErro
 }
 
 func (a *App) ActivateMfa(userID, token string) *model.AppError {
-	user, err := a.Srv().Store.User().Get(userID)
+	user, err := a.Srv().Store.User().Get(context.Background(), userID)
 	if err != nil {
 		var nfErr *store.ErrNotFound
 		switch {
@@ -1212,7 +1213,7 @@ func (a *App) sendUpdatedUserEvent(user model.User) {
 }
 
 func (a *App) UpdateUser(user *model.User, sendNotifications bool) (*model.User, *model.AppError) {
-	prev, err := a.Srv().Store.User().Get(user.Id)
+	prev, err := a.Srv().Store.User().Get(context.Background(), user.Id)
 	if err != nil {
 		var nfErr *store.ErrNotFound
 		switch {
@@ -2058,7 +2059,7 @@ func (a *App) FilterNonGroupChannelMembers(userIDs []string, channel *model.Chan
 // and returns the list of normal users present in userIDs but not in groupUsers.
 func (a *App) filterNonGroupUsers(userIDs []string, groupUsers []*model.User) ([]string, error) {
 	nonMemberIds := []string{}
-	users, err := a.Srv().Store.User().GetProfileByIds(userIDs, nil, false)
+	users, err := a.Srv().Store.User().GetProfileByIds(context.Background(), userIDs, nil, false)
 	if err != nil {
 		return nil, err
 	}
@@ -2223,19 +2224,14 @@ func (a *App) PromoteGuestToUser(user *model.User, requestorId string) *model.Ap
 // DemoteUserToGuest Convert user's roles and all his mermbership's roles from
 // regular user roles to guest roles.
 func (a *App) DemoteUserToGuest(user *model.User) *model.AppError {
-	nErr := a.Srv().Store.User().DemoteUserToGuest(user.Id)
+	demotedUser, nErr := a.Srv().Store.User().DemoteUserToGuest(user.Id)
 	a.InvalidateCacheForUser(user.Id)
 	if nErr != nil {
 		return model.NewAppError("DemoteUserToGuest", "app.user.demote_user_to_guest.user_update.app_error", nil, nErr.Error(), http.StatusInternalServerError)
 	}
 
-	demotedUser, err := a.GetUser(user.Id)
-	if err != nil {
-		mlog.Warn("Failed to get user on demote user to guest", mlog.Err(err))
-	} else {
-		a.sendUpdatedUserEvent(*demotedUser)
-		a.UpdateSessionsIsGuest(demotedUser.Id, demotedUser.IsGuest())
-	}
+	a.sendUpdatedUserEvent(*demotedUser)
+	a.UpdateSessionsIsGuest(demotedUser.Id, demotedUser.IsGuest())
 
 	teamMembers, err := a.GetTeamMembersForUser(user.Id)
 	if err != nil {
@@ -2248,6 +2244,7 @@ func (a *App) DemoteUserToGuest(user *model.User) *model.AppError {
 		channelMembers, err := a.GetChannelMembersForUser(member.TeamId, user.Id)
 		if err != nil {
 			mlog.Warn("Failed to get channel members for users on demote user to guest", mlog.Err(err))
+			continue
 		}
 
 		for _, member := range *channelMembers {
@@ -2260,7 +2257,6 @@ func (a *App) DemoteUserToGuest(user *model.User) *model.AppError {
 	}
 
 	a.ClearSessionCacheForUser(user.Id)
-
 	return nil
 }
 
@@ -2308,7 +2304,7 @@ func (a *App) GetKnownUsers(userID string) ([]string, *model.AppError) {
 
 // ConvertBotToUser converts a bot to user.
 func (a *App) ConvertBotToUser(bot *model.Bot, userPatch *model.UserPatch, sysadmin bool) (*model.User, *model.AppError) {
-	user, nErr := a.Srv().Store.User().Get(bot.UserId)
+	user, nErr := a.Srv().Store.User().Get(context.Background(), bot.UserId)
 	if nErr != nil {
 		var nfErr *store.ErrNotFound
 		switch {

app/webhook.go

@@ -4,6 +4,7 @@
 package app
 
 import (
+	"context"
 	"errors"
 	"io"
 	"net/http"
@@ -674,7 +675,7 @@ func (a *App) HandleIncomingWebhook(hookID string, req *model.IncomingWebhookReq
 
 	uchan := make(chan store.StoreResult, 1)
 	go func() {
-		user, err := a.Srv().Store.User().Get(hook.UserId)
+		user, err := a.Srv().Store.User().Get(context.Background(), hook.UserId)
 		uchan <- store.StoreResult{Data: user, NErr: err}
 		close(uchan)
 	}()

cmd/mattermost/commands/user_test.go

@@ -4,6 +4,7 @@
 package commands
 
 import (
+	"context"
 	"testing"
 
 	"github.com/stretchr/testify/require"
@@ -115,7 +116,7 @@ func TestDeleteUserBotUser(t *testing.T) {
 	defer th.TearDown()
 
 	th.CheckCommand(t, "user", "delete", th.BasicUser.Username, "--confirm")
-	_, err := th.App.Srv().Store.User().Get(th.BasicUser.Id)
+	_, err := th.App.Srv().Store.User().Get(context.Background(), th.BasicUser.Id)
 	require.Error(t, err)
 
 	// Make a bot
@@ -131,7 +132,7 @@ func TestDeleteUserBotUser(t *testing.T) {
 	require.Nil(t, nErr)
 
 	th.CheckCommand(t, "user", "delete", bot.Username, "--confirm")
-	_, err = th.App.Srv().Store.User().Get(user.Id)
+	_, err = th.App.Srv().Store.User().Get(context.Background(), user.Id)
 	require.Error(t, err)
 	_, nErr = th.App.Srv().Store.Bot().Get(user.Id, true)
 	require.Error(t, nErr)
@@ -199,7 +200,7 @@ func TestConvertUser(t *testing.T) {
 		_, err = th.App.Srv().Store.Bot().Get(th.BasicUser2.Id, false)
 		require.NotNil(t, err)
 
-		user, appErr := th.App.Srv().Store.User().Get(th.BasicUser2.Id)
+		user, appErr := th.App.Srv().Store.User().Get(context.Background(), th.BasicUser2.Id)
 		require.Nil(t, appErr)
 		require.Equal(t, "newusername", user.Username)
 		require.Equal(t, "valid@email.com", user.Email)

cmd/mattermost/commands/userargs.go

@@ -4,6 +4,8 @@
 package commands
 
 import (
+	"context"
+
 	"github.com/mattermost/mattermost-server/v5/app"
 	"github.com/mattermost/mattermost-server/v5/model"
 )
@@ -28,7 +30,7 @@ func getUserFromUserArg(a *app.App, userArg string) *model.User {
 	}
 
 	if user == nil {
-		user, _ = a.Srv().Store.User().Get(userArg)
+		user, _ = a.Srv().Store.User().Get(context.Background(), userArg)
 	}
 
 	return user

store/localcachelayer/layer.go

@@ -98,7 +98,7 @@ type LocalCacheStore struct {
 	postLastPostsCache cache.Cache
 	lastPostTimeCache  cache.Cache
 
-	user                   LocalCacheUserStore
+	user                   *LocalCacheUserStore
 	userProfileByIdsCache  cache.Cache
 	profilesInChannelCache cache.Cache
 
@@ -283,7 +283,12 @@ func NewLocalCacheLayer(baseStore store.Store, metrics einterfaces.MetricsInterf
 	}); err != nil {
 		return
 	}
-	localCacheStore.user = LocalCacheUserStore{UserStore: baseStore.User(), rootStore: &localCacheStore}
+	localCacheStore.user = &LocalCacheUserStore{
+		UserStore:                      baseStore.User(),
+		rootStore:                      &localCacheStore,
+		userProfileByIdsInvalidations:  make(map[string]bool),
+		profilesInChannelInvalidations: make(map[string]bool),
+	}
 
 	// Teams
 	if localCacheStore.teamAllTeamIdsForUserCache, err = cacheProvider.NewCache(&cache.CacheOptions{

store/localcachelayer/main_test.go

@@ -132,16 +132,16 @@ func getMockStore() *mocks.Store {
 		AuthService: "authService",
 	}}
 	mockUserStore := mocks.UserStore{}
-	mockUserStore.On("GetProfileByIds", []string{"123"}, &store.UserGetByIdsOpts{}, true).Return(fakeUser, nil)
-	mockUserStore.On("GetProfileByIds", []string{"123"}, &store.UserGetByIdsOpts{}, false).Return(fakeUser, nil)
+	mockUserStore.On("GetProfileByIds", mock.Anything, []string{"123"}, &store.UserGetByIdsOpts{}, true).Return(fakeUser, nil)
+	mockUserStore.On("GetProfileByIds", mock.Anything, []string{"123"}, &store.UserGetByIdsOpts{}, false).Return(fakeUser, nil)
 
 	fakeProfilesInChannelMap := map[string]*model.User{
 		"456": {Id: "456"},
 	}
-	mockUserStore.On("GetAllProfilesInChannel", "123", true).Return(fakeProfilesInChannelMap, nil)
-	mockUserStore.On("GetAllProfilesInChannel", "123", false).Return(fakeProfilesInChannelMap, nil)
+	mockUserStore.On("GetAllProfilesInChannel", mock.Anything, "123", true).Return(fakeProfilesInChannelMap, nil)
+	mockUserStore.On("GetAllProfilesInChannel", mock.Anything, "123", false).Return(fakeProfilesInChannelMap, nil)
 
-	mockUserStore.On("Get", "123").Return(fakeUser[0], nil)
+	mockUserStore.On("Get", mock.Anything, "123").Return(fakeUser[0], nil)
 	users := []*model.User{
 		fakeUser[0],
 		{
@@ -150,8 +150,8 @@ func getMockStore() *mocks.Store {
 			AuthService: "authService",
 		},
 	}
-	mockUserStore.On("GetMany", []string{"123", "456"}).Return(users, nil)
-	mockUserStore.On("GetMany", []string{"123"}).Return(users[0:1], nil)
+	mockUserStore.On("GetMany", mock.Anything, []string{"123", "456"}).Return(users, nil)
+	mockUserStore.On("GetMany", mock.Anything, []string{"123"}).Return(users[0:1], nil)
 	mockStore.On("User").Return(&mockUserStore)
 
 	fakeUserTeamIds := []string{"1", "2", "3"}

store/localcachelayer/user_layer.go

@@ -4,21 +4,31 @@
 package localcachelayer
 
 import (
+	"context"
 	"sort"
+	"sync"
 
 	"github.com/mattermost/mattermost-server/v5/model"
 	"github.com/mattermost/mattermost-server/v5/store"
+	"github.com/mattermost/mattermost-server/v5/store/sqlstore"
 )
 
 type LocalCacheUserStore struct {
 	store.UserStore
-	rootStore *LocalCacheStore
+	rootStore                      *LocalCacheStore
+	userProfileByIdsMut            sync.Mutex
+	userProfileByIdsInvalidations  map[string]bool
+	profilesInChannelMut           sync.Mutex
+	profilesInChannelInvalidations map[string]bool
 }
 
 func (s *LocalCacheUserStore) handleClusterInvalidateScheme(msg *model.ClusterMessage) {
 	if msg.Data == ClearCacheMessageData {
 		s.rootStore.userProfileByIdsCache.Purge()
 	} else {
+		s.userProfileByIdsMut.Lock()
+		s.userProfileByIdsInvalidations[msg.Data] = true
+		s.userProfileByIdsMut.Unlock()
 		s.rootStore.userProfileByIdsCache.Remove(msg.Data)
 	}
 }
@@ -27,11 +37,14 @@ func (s *LocalCacheUserStore) handleClusterInvalidateProfilesInChannel(msg *mode
 	if msg.Data == ClearCacheMessageData {
 		s.rootStore.profilesInChannelCache.Purge()
 	} else {
+		s.profilesInChannelMut.Lock()
+		s.profilesInChannelInvalidations[msg.Data] = true
+		s.profilesInChannelMut.Unlock()
 		s.rootStore.profilesInChannelCache.Remove(msg.Data)
 	}
 }
 
-func (s LocalCacheUserStore) ClearCaches() {
+func (s *LocalCacheUserStore) ClearCaches() {
 	s.rootStore.userProfileByIdsCache.Purge()
 	s.rootStore.profilesInChannelCache.Purge()
 
@@ -41,7 +54,10 @@ func (s LocalCacheUserStore) ClearCaches() {
 	}
 }
 
-func (s LocalCacheUserStore) InvalidateProfileCacheForUser(userId string) {
+func (s *LocalCacheUserStore) InvalidateProfileCacheForUser(userId string) {
+	s.userProfileByIdsMut.Lock()
+	s.userProfileByIdsInvalidations[userId] = true
+	s.userProfileByIdsMut.Unlock()
 	s.rootStore.doInvalidateCacheCluster(s.rootStore.userProfileByIdsCache, userId)
 
 	if s.rootStore.metrics != nil {
@@ -49,13 +65,16 @@ func (s LocalCacheUserStore) InvalidateProfileCacheForUser(userId string) {
 	}
 }
 
-func (s LocalCacheUserStore) InvalidateProfilesInChannelCacheByUser(userId string) {
+func (s *LocalCacheUserStore) InvalidateProfilesInChannelCacheByUser(userId string) {
 	keys, err := s.rootStore.profilesInChannelCache.Keys()
 	if err == nil {
 		for _, key := range keys {
 			var userMap map[string]*model.User
 			if err = s.rootStore.profilesInChannelCache.Get(key, &userMap); err == nil {
 				if _, userInCache := userMap[userId]; userInCache {
+					s.profilesInChannelMut.Lock()
+					s.profilesInChannelInvalidations[key] = true
+					s.profilesInChannelMut.Unlock()
 					s.rootStore.doInvalidateCacheCluster(s.rootStore.profilesInChannelCache, key)
 					if s.rootStore.metrics != nil {
 						s.rootStore.metrics.IncrementMemCacheInvalidationCounter("Profiles in Channel - Remove by User")
@@ -66,14 +85,17 @@ func (s LocalCacheUserStore) InvalidateProfilesInChannelCacheByUser(userId strin
 	}
 }
 
-func (s LocalCacheUserStore) InvalidateProfilesInChannelCache(channelId string) {
-	s.rootStore.doInvalidateCacheCluster(s.rootStore.profilesInChannelCache, channelId)
+func (s *LocalCacheUserStore) InvalidateProfilesInChannelCache(channelID string) {
+	s.profilesInChannelMut.Lock()
+	s.profilesInChannelInvalidations[channelID] = true
+	s.profilesInChannelMut.Unlock()
+	s.rootStore.doInvalidateCacheCluster(s.rootStore.profilesInChannelCache, channelID)
 	if s.rootStore.metrics != nil {
 		s.rootStore.metrics.IncrementMemCacheInvalidationCounter("Profiles in Channel - Remove by Channel")
 	}
 }
 
-func (s LocalCacheUserStore) GetAllProfilesInChannel(channelId string, allowFromCache bool) (map[string]*model.User, error) {
+func (s *LocalCacheUserStore) GetAllProfilesInChannel(ctx context.Context, channelId string, allowFromCache bool) (map[string]*model.User, error) {
 	if allowFromCache {
 		var cachedMap map[string]*model.User
 		if err := s.rootStore.doStandardReadCache(s.rootStore.profilesInChannelCache, channelId, &cachedMap); err == nil {
@@ -81,7 +103,16 @@ func (s LocalCacheUserStore) GetAllProfilesInChannel(channelId string, allowFrom
 		}
 	}
 
-	userMap, err := s.UserStore.GetAllProfilesInChannel(channelId, allowFromCache)
+	// If it was invalidated, then we need to query master.
+	s.profilesInChannelMut.Lock()
+	if s.profilesInChannelInvalidations[channelId] {
+		ctx = sqlstore.WithMaster(ctx)
+		// And then remove the key from the map.
+		delete(s.profilesInChannelInvalidations, channelId)
+	}
+	s.profilesInChannelMut.Unlock()
+
+	userMap, err := s.UserStore.GetAllProfilesInChannel(ctx, channelId, allowFromCache)
 	if err != nil {
 		return nil, err
 	}
@@ -93,9 +124,9 @@ func (s LocalCacheUserStore) GetAllProfilesInChannel(channelId string, allowFrom
 	return userMap, nil
 }
 
-func (s LocalCacheUserStore) GetProfileByIds(userIds []string, options *store.UserGetByIdsOpts, allowFromCache bool) ([]*model.User, error) {
+func (s *LocalCacheUserStore) GetProfileByIds(ctx context.Context, userIds []string, options *store.UserGetByIdsOpts, allowFromCache bool) ([]*model.User, error) {
 	if !allowFromCache {
-		return s.UserStore.GetProfileByIds(userIds, options, false)
+		return s.UserStore.GetProfileByIds(ctx, userIds, options, false)
 	}
 
 	if options == nil {
@@ -105,6 +136,7 @@ func (s LocalCacheUserStore) GetProfileByIds(userIds []string, options *store.Us
 	users := []*model.User{}
 	remainingUserIds := make([]string, 0)
 
+	fromMaster := false
 	for _, userId := range userIds {
 		var cacheItem *model.User
 		if err := s.rootStore.doStandardReadCache(s.rootStore.userProfileByIdsCache, userId, &cacheItem); err == nil {
@@ -112,6 +144,14 @@ func (s LocalCacheUserStore) GetProfileByIds(userIds []string, options *store.Us
 				users = append(users, cacheItem)
 			}
 		} else {
+			// If it was invalidated, then we need to query master.
+			s.userProfileByIdsMut.Lock()
+			if s.userProfileByIdsInvalidations[userId] {
+				fromMaster = true
+				// And then remove the key from the map.
+				delete(s.userProfileByIdsInvalidations, userId)
+			}
+			s.userProfileByIdsMut.Unlock()
 			remainingUserIds = append(remainingUserIds, userId)
 		}
 	}
@@ -122,7 +162,10 @@ func (s LocalCacheUserStore) GetProfileByIds(userIds []string, options *store.Us
 	}
 
 	if len(remainingUserIds) > 0 {
-		remainingUsers, err := s.UserStore.GetProfileByIds(remainingUserIds, options, false)
+		if fromMaster {
+			ctx = sqlstore.WithMaster(ctx)
+		}
+		remainingUsers, err := s.UserStore.GetProfileByIds(ctx, remainingUserIds, options, false)
 		if err != nil {
 			return nil, err
 		}
@@ -139,7 +182,7 @@ func (s LocalCacheUserStore) GetProfileByIds(userIds []string, options *store.Us
 // It checks if the user entry is present in the cache, returning the entry from cache
 // if it is present. Otherwise, it fetches the entry from the store and stores it in the
 // cache.
-func (s LocalCacheUserStore) Get(id string) (*model.User, error) {
+func (s *LocalCacheUserStore) Get(ctx context.Context, id string) (*model.User, error) {
 	var cacheItem *model.User
 	if err := s.rootStore.doStandardReadCache(s.rootStore.userProfileByIdsCache, id, &cacheItem); err == nil {
 		if s.rootStore.metrics != nil {
@@ -150,7 +193,17 @@ func (s LocalCacheUserStore) Get(id string) (*model.User, error) {
 	if s.rootStore.metrics != nil {
 		s.rootStore.metrics.AddMemCacheMissCounter("Profile By Id", float64(1))
 	}
-	user, err := s.UserStore.Get(id)
+
+	// If it was invalidated, then we need to query master.
+	s.userProfileByIdsMut.Lock()
+	if s.userProfileByIdsInvalidations[id] {
+		ctx = sqlstore.WithMaster(ctx)
+		// And then remove the key from the map.
+		delete(s.userProfileByIdsInvalidations, id)
+	}
+	s.userProfileByIdsMut.Unlock()
+
+	user, err := s.UserStore.Get(ctx, id)
 	if err != nil {
 		return nil, err
 	}
@@ -162,13 +215,14 @@ func (s LocalCacheUserStore) Get(id string) (*model.User, error) {
 // It checks if the user entries are present in the cache, returning the entries from cache
 // if it is present. Otherwise, it fetches the entries from the store and stores it in the
 // cache.
-func (s LocalCacheUserStore) GetMany(ids []string) ([]*model.User, error) {
+func (s *LocalCacheUserStore) GetMany(ctx context.Context, ids []string) ([]*model.User, error) {
 	// we are doing a loop instead of caching the full set in the cache because the number of permutations that we can have
 	// in this func is making caching of the total set not beneficial.
 	var cachedUsers []*model.User
 	var notCachedUserIds []string
 	uniqIDs := dedup(ids)
 
+	fromMaster := false
 	for _, id := range uniqIDs {
 		var cachedUser *model.User
 		if err := s.rootStore.doStandardReadCache(s.rootStore.userProfileByIdsCache, id, &cachedUser); err == nil {
@@ -180,13 +234,24 @@ func (s LocalCacheUserStore) GetMany(ids []string) ([]*model.User, error) {
 			if s.rootStore.metrics != nil {
 				s.rootStore.metrics.AddMemCacheMissCounter("Profile By Id", float64(1))
 			}
+			// If it was invalidated, then we need to query master.
+			s.userProfileByIdsMut.Lock()
+			if s.userProfileByIdsInvalidations[id] {
+				fromMaster = true
+				// And then remove the key from the map.
+				delete(s.userProfileByIdsInvalidations, id)
+			}
+			s.userProfileByIdsMut.Unlock()
 
 			notCachedUserIds = append(notCachedUserIds, id)
 		}
 	}
 
 	if len(notCachedUserIds) > 0 {
-		dbUsers, err := s.UserStore.GetMany(notCachedUserIds)
+		if fromMaster {
+			ctx = sqlstore.WithMaster(ctx)
+		}
+		dbUsers, err := s.UserStore.GetMany(ctx, notCachedUserIds)
 		if err != nil {
 			return nil, err
 		}

store/localcachelayer/user_layer_test.go

@@ -4,12 +4,14 @@
 package localcachelayer
 
 import (
+	"context"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
 	"github.com/mattermost/mattermost-server/v5/model"
+	"github.com/mattermost/mattermost-server/v5/plugin/plugintest/mock"
 	"github.com/mattermost/mattermost-server/v5/store"
 	"github.com/mattermost/mattermost-server/v5/store/storetest"
 	"github.com/mattermost/mattermost-server/v5/store/storetest/mocks"
@@ -33,12 +35,12 @@ func TestUserStoreCache(t *testing.T) {
 		cachedStore, err := NewLocalCacheLayer(mockStore, nil, nil, mockCacheProvider)
 		require.NoError(t, err)
 
-		gotUser, err := cachedStore.User().GetProfileByIds(fakeUserIds, &store.UserGetByIdsOpts{}, true)
+		gotUser, err := cachedStore.User().GetProfileByIds(context.Background(), fakeUserIds, &store.UserGetByIdsOpts{}, true)
 		require.NoError(t, err)
 		assert.Equal(t, fakeUser, gotUser)
 		mockStore.User().(*mocks.UserStore).AssertNumberOfCalls(t, "GetProfileByIds", 1)
 
-		_, _ = cachedStore.User().GetProfileByIds(fakeUserIds, &store.UserGetByIdsOpts{}, true)
+		_, _ = cachedStore.User().GetProfileByIds(context.Background(), fakeUserIds, &store.UserGetByIdsOpts{}, true)
 		mockStore.User().(*mocks.UserStore).AssertNumberOfCalls(t, "GetProfileByIds", 1)
 	})
 
@@ -48,12 +50,12 @@ func TestUserStoreCache(t *testing.T) {
 		cachedStore, err := NewLocalCacheLayer(mockStore, nil, nil, mockCacheProvider)
 		require.NoError(t, err)
 
-		gotUser, err := cachedStore.User().GetProfileByIds(fakeUserIds, &store.UserGetByIdsOpts{}, true)
+		gotUser, err := cachedStore.User().GetProfileByIds(context.Background(), fakeUserIds, &store.UserGetByIdsOpts{}, true)
 		require.NoError(t, err)
 		assert.Equal(t, fakeUser, gotUser)
 		mockStore.User().(*mocks.UserStore).AssertNumberOfCalls(t, "GetProfileByIds", 1)
 
-		_, _ = cachedStore.User().GetProfileByIds(fakeUserIds, &store.UserGetByIdsOpts{}, false)
+		_, _ = cachedStore.User().GetProfileByIds(context.Background(), fakeUserIds, &store.UserGetByIdsOpts{}, false)
 		mockStore.User().(*mocks.UserStore).AssertNumberOfCalls(t, "GetProfileByIds", 2)
 	})
 
@@ -63,13 +65,13 @@ func TestUserStoreCache(t *testing.T) {
 		cachedStore, err := NewLocalCacheLayer(mockStore, nil, nil, mockCacheProvider)
 		require.NoError(t, err)
 
-		gotUser, err := cachedStore.User().GetProfileByIds(fakeUserIds, &store.UserGetByIdsOpts{}, true)
+		gotUser, err := cachedStore.User().GetProfileByIds(context.Background(), fakeUserIds, &store.UserGetByIdsOpts{}, true)
 		require.NoError(t, err)
 		assert.Equal(t, fakeUser, gotUser)
 
 		cachedStore.User().InvalidateProfileCacheForUser("123")
 
-		_, _ = cachedStore.User().GetProfileByIds(fakeUserIds, &store.UserGetByIdsOpts{}, true)
+		_, _ = cachedStore.User().GetProfileByIds(context.Background(), fakeUserIds, &store.UserGetByIdsOpts{}, true)
 		mockStore.User().(*mocks.UserStore).AssertNumberOfCalls(t, "GetProfileByIds", 2)
 	})
 
@@ -79,7 +81,7 @@ func TestUserStoreCache(t *testing.T) {
 		cachedStore, err := NewLocalCacheLayer(mockStore, nil, nil, mockCacheProvider)
 		require.NoError(t, err)
 
-		storedUsers, err := mockStore.User().GetProfileByIds(fakeUserIds, &store.UserGetByIdsOpts{}, false)
+		storedUsers, err := mockStore.User().GetProfileByIds(context.Background(), fakeUserIds, &store.UserGetByIdsOpts{}, false)
 		require.NoError(t, err)
 
 		originalProps := make([]model.StringMap, len(storedUsers))
@@ -90,14 +92,14 @@ func TestUserStoreCache(t *testing.T) {
 			storedUsers[i].NotifyProps["key"] = "somevalue"
 		}
 
-		cachedUsers, err := cachedStore.User().GetProfileByIds(fakeUserIds, &store.UserGetByIdsOpts{}, true)
+		cachedUsers, err := cachedStore.User().GetProfileByIds(context.Background(), fakeUserIds, &store.UserGetByIdsOpts{}, true)
 		require.NoError(t, err)
 
 		for i := 0; i < len(storedUsers); i++ {
 			assert.Equal(t, storedUsers[i].Id, cachedUsers[i].Id)
 		}
 
-		cachedUsers, err = cachedStore.User().GetProfileByIds(fakeUserIds, &store.UserGetByIdsOpts{}, true)
+		cachedUsers, err = cachedStore.User().GetProfileByIds(context.Background(), fakeUserIds, &store.UserGetByIdsOpts{}, true)
 		require.NoError(t, err)
 		for i := 0; i < len(storedUsers); i++ {
 			storedUsers[i].Props = model.StringMap{}
@@ -129,12 +131,12 @@ func TestUserStoreProfilesInChannelCache(t *testing.T) {
 		cachedStore, err := NewLocalCacheLayer(mockStore, nil, nil, mockCacheProvider)
 		require.NoError(t, err)
 
-		gotMap, err := cachedStore.User().GetAllProfilesInChannel(fakeChannelId, true)
+		gotMap, err := cachedStore.User().GetAllProfilesInChannel(context.Background(), fakeChannelId, true)
 		require.NoError(t, err)
 		assert.Equal(t, fakeMap, gotMap)
 		mockStore.User().(*mocks.UserStore).AssertNumberOfCalls(t, "GetAllProfilesInChannel", 1)
 
-		_, _ = cachedStore.User().GetAllProfilesInChannel(fakeChannelId, true)
+		_, _ = cachedStore.User().GetAllProfilesInChannel(context.Background(), fakeChannelId, true)
 		mockStore.User().(*mocks.UserStore).AssertNumberOfCalls(t, "GetAllProfilesInChannel", 1)
 	})
 
@@ -144,12 +146,12 @@ func TestUserStoreProfilesInChannelCache(t *testing.T) {
 		cachedStore, err := NewLocalCacheLayer(mockStore, nil, nil, mockCacheProvider)
 		require.NoError(t, err)
 
-		gotMap, err := cachedStore.User().GetAllProfilesInChannel(fakeChannelId, true)
+		gotMap, err := cachedStore.User().GetAllProfilesInChannel(context.Background(), fakeChannelId, true)
 		require.NoError(t, err)
 		assert.Equal(t, fakeMap, gotMap)
 		mockStore.User().(*mocks.UserStore).AssertNumberOfCalls(t, "GetAllProfilesInChannel", 1)
 
-		_, _ = cachedStore.User().GetAllProfilesInChannel(fakeChannelId, false)
+		_, _ = cachedStore.User().GetAllProfilesInChannel(context.Background(), fakeChannelId, false)
 		mockStore.User().(*mocks.UserStore).AssertNumberOfCalls(t, "GetAllProfilesInChannel", 2)
 	})
 
@@ -159,14 +161,14 @@ func TestUserStoreProfilesInChannelCache(t *testing.T) {
 		cachedStore, err := NewLocalCacheLayer(mockStore, nil, nil, mockCacheProvider)
 		require.NoError(t, err)
 
-		gotMap, err := cachedStore.User().GetAllProfilesInChannel(fakeChannelId, true)
+		gotMap, err := cachedStore.User().GetAllProfilesInChannel(context.Background(), fakeChannelId, true)
 		require.NoError(t, err)
 		assert.Equal(t, fakeMap, gotMap)
 		mockStore.User().(*mocks.UserStore).AssertNumberOfCalls(t, "GetAllProfilesInChannel", 1)
 
 		cachedStore.User().InvalidateProfilesInChannelCache("123")
 
-		_, _ = cachedStore.User().GetAllProfilesInChannel(fakeChannelId, true)
+		_, _ = cachedStore.User().GetAllProfilesInChannel(context.Background(), fakeChannelId, true)
 		mockStore.User().(*mocks.UserStore).AssertNumberOfCalls(t, "GetAllProfilesInChannel", 2)
 	})
 
@@ -176,14 +178,14 @@ func TestUserStoreProfilesInChannelCache(t *testing.T) {
 		cachedStore, err := NewLocalCacheLayer(mockStore, nil, nil, mockCacheProvider)
 		require.NoError(t, err)
 
-		gotMap, err := cachedStore.User().GetAllProfilesInChannel(fakeChannelId, true)
+		gotMap, err := cachedStore.User().GetAllProfilesInChannel(context.Background(), fakeChannelId, true)
 		require.NoError(t, err)
 		assert.Equal(t, fakeMap, gotMap)
 		mockStore.User().(*mocks.UserStore).AssertNumberOfCalls(t, "GetAllProfilesInChannel", 1)
 
 		cachedStore.User().InvalidateProfilesInChannelCacheByUser("456")
 
-		_, _ = cachedStore.User().GetAllProfilesInChannel(fakeChannelId, true)
+		_, _ = cachedStore.User().GetAllProfilesInChannel(context.Background(), fakeChannelId, true)
 		mockStore.User().(*mocks.UserStore).AssertNumberOfCalls(t, "GetAllProfilesInChannel", 2)
 	})
 }
@@ -201,12 +203,12 @@ func TestUserStoreGetCache(t *testing.T) {
 		cachedStore, err := NewLocalCacheLayer(mockStore, nil, nil, mockCacheProvider)
 		require.NoError(t, err)
 
-		gotUser, err := cachedStore.User().Get(fakeUserId)
+		gotUser, err := cachedStore.User().Get(context.Background(), fakeUserId)
 		require.NoError(t, err)
 		assert.Equal(t, fakeUser, gotUser)
 		mockStore.User().(*mocks.UserStore).AssertNumberOfCalls(t, "Get", 1)
 
-		_, _ = cachedStore.User().Get(fakeUserId)
+		_, _ = cachedStore.User().Get(context.Background(), fakeUserId)
 		mockStore.User().(*mocks.UserStore).AssertNumberOfCalls(t, "Get", 1)
 	})
 
@@ -216,14 +218,14 @@ func TestUserStoreGetCache(t *testing.T) {
 		cachedStore, err := NewLocalCacheLayer(mockStore, nil, nil, mockCacheProvider)
 		require.NoError(t, err)
 
-		gotUser, err := cachedStore.User().Get(fakeUserId)
+		gotUser, err := cachedStore.User().Get(context.Background(), fakeUserId)
 		require.NoError(t, err)
 		assert.Equal(t, fakeUser, gotUser)
 		mockStore.User().(*mocks.UserStore).AssertNumberOfCalls(t, "Get", 1)
 
 		cachedStore.User().InvalidateProfileCacheForUser("123")
 
-		_, _ = cachedStore.User().Get(fakeUserId)
+		_, _ = cachedStore.User().Get(context.Background(), fakeUserId)
 		mockStore.User().(*mocks.UserStore).AssertNumberOfCalls(t, "Get", 2)
 	})
 
@@ -233,20 +235,20 @@ func TestUserStoreGetCache(t *testing.T) {
 		cachedStore, err := NewLocalCacheLayer(mockStore, nil, nil, mockCacheProvider)
 		require.NoError(t, err)
 
-		storedUser, err := mockStore.User().Get(fakeUserId)
+		storedUser, err := mockStore.User().Get(context.Background(), fakeUserId)
 		require.NoError(t, err)
 		originalProps := storedUser.NotifyProps
 
 		storedUser.NotifyProps = map[string]string{}
 		storedUser.NotifyProps["key"] = "somevalue"
 
-		cachedUser, err := cachedStore.User().Get(fakeUserId)
+		cachedUser, err := cachedStore.User().Get(context.Background(), fakeUserId)
 		require.NoError(t, err)
 		assert.Equal(t, storedUser, cachedUser)
 
 		storedUser.Props = model.StringMap{}
 		storedUser.Timezone = model.StringMap{}
-		cachedUser, err = cachedStore.User().Get(fakeUserId)
+		cachedUser, err = cachedStore.User().Get(context.Background(), fakeUserId)
 		require.NoError(t, err)
 		assert.Equal(t, storedUser, cachedUser)
 		if storedUser == cachedUser {
@@ -276,13 +278,13 @@ func TestUserStoreGetManyCache(t *testing.T) {
 		cachedStore, err := NewLocalCacheLayer(mockStore, nil, nil, mockCacheProvider)
 		require.NoError(t, err)
 
-		gotUsers, err := cachedStore.User().GetMany([]string{fakeUser.Id, otherFakeUser.Id})
+		gotUsers, err := cachedStore.User().GetMany(context.Background(), []string{fakeUser.Id, otherFakeUser.Id})
 		require.Nil(t, err)
 		assert.Len(t, gotUsers, 2)
 		assert.Contains(t, gotUsers, fakeUser)
 		assert.Contains(t, gotUsers, otherFakeUser)
 
-		gotUsers, err = cachedStore.User().GetMany([]string{fakeUser.Id, otherFakeUser.Id})
+		gotUsers, err = cachedStore.User().GetMany(context.Background(), []string{fakeUser.Id, otherFakeUser.Id})
 		require.Nil(t, err)
 		assert.Len(t, gotUsers, 2)
 		mockStore.User().(*mocks.UserStore).AssertNumberOfCalls(t, "GetMany", 1)
@@ -294,7 +296,7 @@ func TestUserStoreGetManyCache(t *testing.T) {
 		cachedStore, err := NewLocalCacheLayer(mockStore, nil, nil, mockCacheProvider)
 		require.NoError(t, err)
 
-		gotUsers, err := cachedStore.User().GetMany([]string{fakeUser.Id, otherFakeUser.Id})
+		gotUsers, err := cachedStore.User().GetMany(context.Background(), []string{fakeUser.Id, otherFakeUser.Id})
 		require.Nil(t, err)
 		assert.Len(t, gotUsers, 2)
 		assert.Contains(t, gotUsers, fakeUser)
@@ -302,10 +304,10 @@ func TestUserStoreGetManyCache(t *testing.T) {
 
 		cachedStore.User().InvalidateProfileCacheForUser("123")
 
-		gotUsers, err = cachedStore.User().GetMany([]string{fakeUser.Id, otherFakeUser.Id})
+		gotUsers, err = cachedStore.User().GetMany(context.Background(), []string{fakeUser.Id, otherFakeUser.Id})
 		require.NoError(t, err)
 		assert.Len(t, gotUsers, 2)
-		mockStore.User().(*mocks.UserStore).AssertCalled(t, "GetMany", []string{"123"})
+		mockStore.User().(*mocks.UserStore).AssertCalled(t, "GetMany", mock.Anything, []string{"123"})
 		mockStore.User().(*mocks.UserStore).AssertNumberOfCalls(t, "GetMany", 2)
 	})
 }

store/opentracinglayer/opentracinglayer.go

@@ -8394,7 +8394,7 @@ func (s *OpenTracingLayerUserStore) DeactivateGuests() ([]string, error) {
 	return result, err
 }
 
-func (s *OpenTracingLayerUserStore) DemoteUserToGuest(userID string) error {
+func (s *OpenTracingLayerUserStore) DemoteUserToGuest(userID string) (*model.User, error) {
 	origCtx := s.Root.Store.Context()
 	span, newCtx := tracing.StartSpanWithParentByContext(s.Root.Store.Context(), "UserStore.DemoteUserToGuest")
 	s.Root.Store.SetContext(newCtx)
@@ -8403,16 +8403,16 @@ func (s *OpenTracingLayerUserStore) DemoteUserToGuest(userID string) error {
 	}()
 
 	defer span.Finish()
-	err := s.UserStore.DemoteUserToGuest(userID)
+	result, err := s.UserStore.DemoteUserToGuest(userID)
 	if err != nil {
 		span.LogFields(spanlog.Error(err))
 		ext.Error.Set(span, true)
 	}
 
-	return err
+	return result, err
 }
 
-func (s *OpenTracingLayerUserStore) Get(id string) (*model.User, error) {
+func (s *OpenTracingLayerUserStore) Get(ctx context.Context, id string) (*model.User, error) {
 	origCtx := s.Root.Store.Context()
 	span, newCtx := tracing.StartSpanWithParentByContext(s.Root.Store.Context(), "UserStore.Get")
 	s.Root.Store.SetContext(newCtx)
@@ -8421,7 +8421,7 @@ func (s *OpenTracingLayerUserStore) Get(id string) (*model.User, error) {
 	}()
 
 	defer span.Finish()
-	result, err := s.UserStore.Get(id)
+	result, err := s.UserStore.Get(ctx, id)
 	if err != nil {
 		span.LogFields(spanlog.Error(err))
 		ext.Error.Set(span, true)
@@ -8502,7 +8502,7 @@ func (s *OpenTracingLayerUserStore) GetAllProfiles(options *model.UserGetOptions
 	return result, err
 }
 
-func (s *OpenTracingLayerUserStore) GetAllProfilesInChannel(channelId string, allowFromCache bool) (map[string]*model.User, error) {
+func (s *OpenTracingLayerUserStore) GetAllProfilesInChannel(ctx context.Context, channelId string, allowFromCache bool) (map[string]*model.User, error) {
 	origCtx := s.Root.Store.Context()
 	span, newCtx := tracing.StartSpanWithParentByContext(s.Root.Store.Context(), "UserStore.GetAllProfilesInChannel")
 	s.Root.Store.SetContext(newCtx)
@@ -8511,7 +8511,7 @@ func (s *OpenTracingLayerUserStore) GetAllProfilesInChannel(channelId string, al
 	}()
 
 	defer span.Finish()
-	result, err := s.UserStore.GetAllProfilesInChannel(channelId, allowFromCache)
+	result, err := s.UserStore.GetAllProfilesInChannel(ctx, channelId, allowFromCache)
 	if err != nil {
 		span.LogFields(spanlog.Error(err))
 		ext.Error.Set(span, true)
@@ -8703,7 +8703,7 @@ func (s *OpenTracingLayerUserStore) GetKnownUsers(userID string) ([]string, erro
 	return result, err
 }
 
-func (s *OpenTracingLayerUserStore) GetMany(ids []string) ([]*model.User, error) {
+func (s *OpenTracingLayerUserStore) GetMany(ctx context.Context, ids []string) ([]*model.User, error) {
 	origCtx := s.Root.Store.Context()
 	span, newCtx := tracing.StartSpanWithParentByContext(s.Root.Store.Context(), "UserStore.GetMany")
 	s.Root.Store.SetContext(newCtx)
@@ -8712,7 +8712,7 @@ func (s *OpenTracingLayerUserStore) GetMany(ids []string) ([]*model.User, error)
 	}()
 
 	defer span.Finish()
-	result, err := s.UserStore.GetMany(ids)
+	result, err := s.UserStore.GetMany(ctx, ids)
 	if err != nil {
 		span.LogFields(spanlog.Error(err))
 		ext.Error.Set(span, true)
@@ -8757,7 +8757,7 @@ func (s *OpenTracingLayerUserStore) GetProfileByGroupChannelIdsForUser(userId st
 	return result, err
 }
 
-func (s *OpenTracingLayerUserStore) GetProfileByIds(userIds []string, options *store.UserGetByIdsOpts, allowFromCache bool) ([]*model.User, error) {
+func (s *OpenTracingLayerUserStore) GetProfileByIds(ctx context.Context, userIds []string, options *store.UserGetByIdsOpts, allowFromCache bool) ([]*model.User, error) {
 	origCtx := s.Root.Store.Context()
 	span, newCtx := tracing.StartSpanWithParentByContext(s.Root.Store.Context(), "UserStore.GetProfileByIds")
 	s.Root.Store.SetContext(newCtx)
@@ -8766,7 +8766,7 @@ func (s *OpenTracingLayerUserStore) GetProfileByIds(userIds []string, options *s
 	}()
 
 	defer span.Finish()
-	result, err := s.UserStore.GetProfileByIds(userIds, options, allowFromCache)
+	result, err := s.UserStore.GetProfileByIds(ctx, userIds, options, allowFromCache)
 	if err != nil {
 		span.LogFields(spanlog.Error(err))
 		ext.Error.Set(span, true)

store/retrylayer/retrylayer.go

@@ -9110,31 +9110,31 @@ func (s *RetryLayerUserStore) DeactivateGuests() ([]string, error) {
 
 }
 
-func (s *RetryLayerUserStore) DemoteUserToGuest(userID string) error {
+func (s *RetryLayerUserStore) DemoteUserToGuest(userID string) (*model.User, error) {
 
 	tries := 0
 	for {
-		err := s.UserStore.DemoteUserToGuest(userID)
+		result, err := s.UserStore.DemoteUserToGuest(userID)
 		if err == nil {
-			return nil
+			return result, nil
 		}
 		if !isRepeatableError(err) {
-			return err
+			return result, err
 		}
 		tries++
 		if tries >= 3 {
 			err = errors.Wrap(err, "giving up after 3 consecutive repeatable transaction failures")
-			return err
+			return result, err
 		}
 	}
 
 }
 
-func (s *RetryLayerUserStore) Get(id string) (*model.User, error) {
+func (s *RetryLayerUserStore) Get(ctx context.Context, id string) (*model.User, error) {
 
 	tries := 0
 	for {
-		result, err := s.UserStore.Get(id)
+		result, err := s.UserStore.Get(ctx, id)
 		if err == nil {
 			return result, nil
 		}
@@ -9230,11 +9230,11 @@ func (s *RetryLayerUserStore) GetAllProfiles(options *model.UserGetOptions) ([]*
 
 }
 
-func (s *RetryLayerUserStore) GetAllProfilesInChannel(channelId string, allowFromCache bool) (map[string]*model.User, error) {
+func (s *RetryLayerUserStore) GetAllProfilesInChannel(ctx context.Context, channelId string, allowFromCache bool) (map[string]*model.User, error) {
 
 	tries := 0
 	for {
-		result, err := s.UserStore.GetAllProfilesInChannel(channelId, allowFromCache)
+		result, err := s.UserStore.GetAllProfilesInChannel(ctx, channelId, allowFromCache)
 		if err == nil {
 			return result, nil
 		}
@@ -9428,11 +9428,11 @@ func (s *RetryLayerUserStore) GetKnownUsers(userID string) ([]string, error) {
 
 }
 
-func (s *RetryLayerUserStore) GetMany(ids []string) ([]*model.User, error) {
+func (s *RetryLayerUserStore) GetMany(ctx context.Context, ids []string) ([]*model.User, error) {
 
 	tries := 0
 	for {
-		result, err := s.UserStore.GetMany(ids)
+		result, err := s.UserStore.GetMany(ctx, ids)
 		if err == nil {
 			return result, nil
 		}
@@ -9488,11 +9488,11 @@ func (s *RetryLayerUserStore) GetProfileByGroupChannelIdsForUser(userId string,
 
 }
 
-func (s *RetryLayerUserStore) GetProfileByIds(userIds []string, options *store.UserGetByIdsOpts, allowFromCache bool) ([]*model.User, error) {
+func (s *RetryLayerUserStore) GetProfileByIds(ctx context.Context, userIds []string, options *store.UserGetByIdsOpts, allowFromCache bool) ([]*model.User, error) {
 
 	tries := 0
 	for {
-		result, err := s.UserStore.GetProfileByIds(userIds, options, allowFromCache)
+		result, err := s.UserStore.GetProfileByIds(ctx, userIds, options, allowFromCache)
 		if err == nil {
 			return result, nil
 		}

store/searchlayer/channel_layer.go

@@ -4,6 +4,8 @@
 package searchlayer
 
 import (
+	"context"
+
 	"github.com/pkg/errors"
 
 	"github.com/mattermost/mattermost-server/v5/mlog"
@@ -193,7 +195,7 @@ func (c *SearchChannelStore) PermanentDeleteMembersByUser(userId string) error {
 }
 
 func (c *SearchChannelStore) RemoveAllDeactivatedMembers(channelId string) error {
-	profiles, errProfiles := c.rootStore.User().GetAllProfilesInChannel(channelId, true)
+	profiles, errProfiles := c.rootStore.User().GetAllProfilesInChannel(context.Background(), channelId, true)
 	if errProfiles != nil {
 		mlog.Warn("Encountered error indexing users for channel", mlog.String("channel_id", channelId), mlog.Err(errProfiles))
 	}
@@ -210,7 +212,7 @@ func (c *SearchChannelStore) RemoveAllDeactivatedMembers(channelId string) error
 }
 
 func (c *SearchChannelStore) PermanentDeleteMembersByChannel(channelId string) error {
-	profiles, errProfiles := c.rootStore.User().GetAllProfilesInChannel(channelId, true)
+	profiles, errProfiles := c.rootStore.User().GetAllProfilesInChannel(context.Background(), channelId, true)
 	if errProfiles != nil {
 		mlog.Warn("Encountered error indexing users for channel", mlog.String("channel_id", channelId), mlog.Err(errProfiles))
 	}

store/searchlayer/layer.go

@@ -4,6 +4,7 @@
 package searchlayer
 
 import (
+	"context"
 	"sync/atomic"
 
 	"github.com/mattermost/mattermost-server/v5/mlog"
@@ -67,7 +68,7 @@ func (s *SearchStore) User() store.UserStore {
 }
 
 func (s *SearchStore) indexUserFromID(userId string) {
-	user, err := s.User().Get(userId)
+	user, err := s.User().Get(context.Background(), userId)
 	if err != nil {
 		return
 	}

store/searchlayer/user_layer.go

@@ -4,6 +4,7 @@
 package searchlayer
 
 import (
+	"context"
 	"strings"
 
 	"github.com/pkg/errors"
@@ -54,7 +55,7 @@ func (s *SearchUserStore) Search(teamId, term string, options *model.UserSearchO
 				continue
 			}
 
-			users, nErr := s.UserStore.GetProfileByIds(usersIds, nil, false)
+			users, nErr := s.UserStore.GetProfileByIds(context.Background(), usersIds, nil, false)
 			if nErr != nil {
 				mlog.Warn("Encountered error on Search", mlog.String("search_engine", engine.GetName()), mlog.Err(nErr))
 				continue
@@ -89,7 +90,7 @@ func (s *SearchUserStore) Save(user *model.User) (*model.User, error) {
 }
 
 func (s *SearchUserStore) PermanentDelete(userId string) error {
-	user, userErr := s.UserStore.Get(userId)
+	user, userErr := s.UserStore.Get(context.Background(), userId)
 	if userErr != nil {
 		mlog.Warn("Encountered error deleting user", mlog.String("user_id", userId), mlog.Err(userErr))
 	}
@@ -116,14 +117,14 @@ func (s *SearchUserStore) autocompleteUsersInChannelByEngine(engine searchengine
 
 	uchan := make(chan store.StoreResult, 1)
 	go func() {
-		users, nErr := s.UserStore.GetProfileByIds(uchanIds, nil, false)
+		users, nErr := s.UserStore.GetProfileByIds(context.Background(), uchanIds, nil, false)
 		uchan <- store.StoreResult{Data: users, NErr: nErr}
 		close(uchan)
 	}()
 
 	nuchan := make(chan store.StoreResult, 1)
 	go func() {
-		users, nErr := s.UserStore.GetProfileByIds(nuchanIds, nil, false)
+		users, nErr := s.UserStore.GetProfileByIds(context.Background(), nuchanIds, nil, false)
 		nuchan <- store.StoreResult{Data: users, NErr: nErr}
 		close(nuchan)
 	}()

store/sqlstore/context.go

@@ -18,8 +18,8 @@ const (
 	useMaster contextValue = "useMaster"
 )
 
-// withMaster adds the context value that master DB should be selected for this request.
-func withMaster(ctx context.Context) context.Context {
+// WithMaster adds the context value that master DB should be selected for this request.
+func WithMaster(ctx context.Context) context.Context {
 	return context.WithValue(ctx, storeContextKey(useMaster), true)
 }
 

store/sqlstore/context_test.go

@@ -13,6 +13,6 @@ import (
 func TestContextMaster(t *testing.T) {
 	ctx := context.Background()
 
-	m := withMaster(ctx)
+	m := WithMaster(ctx)
 	assert.True(t, hasMaster(m))
 }

store/sqlstore/post_store.go

@@ -4,6 +4,7 @@
 package sqlstore
 
 import (
+	"context"
 	"database/sql"
 	"fmt"
 	"regexp"
@@ -677,7 +678,7 @@ func (s *SqlPostStore) prepareThreadedResponse(posts []*postWithExtra, extended,
 	var users []*model.User
 	if extended {
 		var err error
-		users, err = s.User().GetProfileByIds(userIds, &store.UserGetByIdsOpts{}, true)
+		users, err = s.User().GetProfileByIds(context.Background(), userIds, &store.UserGetByIdsOpts{}, true)
 		if err != nil {
 			return nil, err
 		}

store/sqlstore/session_store.go

@@ -84,7 +84,7 @@ func (me SqlSessionStore) Get(sessionIdOrToken string) (*model.Session, error) {
 	session := sessions[0]
 
 	tempMembers, err := me.Team().GetTeamsForUser(
-		withMaster(context.Background()),
+		WithMaster(context.Background()),
 		session.UserId)
 	if err != nil {
 		return nil, errors.Wrapf(err, "failed to find TeamMembers for Session with userId=%s", session.UserId)

store/sqlstore/thread_store.go

@@ -4,6 +4,7 @@
 package sqlstore
 
 import (
+	"context"
 	"database/sql"
 	"time"
 
@@ -288,7 +289,7 @@ func (s *SqlThreadStore) GetThreadsForUser(userId, teamId string, opts model.Get
 	var users []*model.User
 	if opts.Extended {
 		var err error
-		users, err = s.User().GetProfileByIds(userIds, &store.UserGetByIdsOpts{}, true)
+		users, err = s.User().GetProfileByIds(context.Background(), userIds, &store.UserGetByIdsOpts{}, true)
 		if err != nil {
 			return nil, errors.Wrapf(err, "failed to get threads for user id=%s", userId)
 		}
@@ -376,7 +377,7 @@ func (s *SqlThreadStore) GetThreadForUser(userId, teamId, threadId string, exten
 	var users []*model.User
 	if extended {
 		var err error
-		users, err = s.User().GetProfileByIds(thread.Participants, &store.UserGetByIdsOpts{}, true)
+		users, err = s.User().GetProfileByIds(context.Background(), thread.Participants, &store.UserGetByIdsOpts{}, true)
 		if err != nil {
 			return nil, errors.Wrapf(err, "failed to get threads for user id=%s", userId)
 		}

store/sqlstore/user_store.go

@@ -4,6 +4,7 @@
 package sqlstore
 
 import (
+	"context"
 	"database/sql"
 	"encoding/json"
 	"fmt"
@@ -38,7 +39,7 @@ type SqlUserStore struct {
 	usersQuery sq.SelectBuilder
 }
 
-func (us SqlUserStore) ClearCaches() {}
+func (us *SqlUserStore) ClearCaches() {}
 
 func (us SqlUserStore) InvalidateProfileCacheForUser(userId string) {}
 
@@ -326,28 +327,41 @@ func (us SqlUserStore) UpdateMfaActive(userId string, active bool) error {
 }
 
 // GetMany returns a list of users for the provided list of ids
-func (us SqlUserStore) GetMany(ids []string) ([]*model.User, error) {
+func (us SqlUserStore) GetMany(ctx context.Context, ids []string) ([]*model.User, error) {
 	query := us.usersQuery.Where(sq.Eq{"Id": ids})
 	queryString, args, err := query.ToSql()
 	if err != nil {
 		return nil, errors.Wrap(err, "users_get_many_tosql")
 	}
 
+	var db *gorp.DbMap
+	if hasMaster(ctx) {
+		db = us.GetMaster()
+	} else {
+		db = us.GetReplica()
+	}
+
 	var users []*model.User
-	if _, err := us.GetReplica().Select(&users, queryString, args...); err != nil {
+	if _, err := db.Select(&users, queryString, args...); err != nil {
 		return nil, errors.Wrap(err, "users_get_many_select")
 	}
 
 	return users, nil
 }
 
-func (us SqlUserStore) Get(id string) (*model.User, error) {
+func (us SqlUserStore) Get(ctx context.Context, id string) (*model.User, error) {
 	query := us.usersQuery.Where("Id = ?", id)
 	queryString, args, err := query.ToSql()
 	if err != nil {
 		return nil, errors.Wrap(err, "users_get_tosql")
 	}
-	row := us.GetReplica().Db.QueryRow(queryString, args...)
+	var db *gorp.DbMap
+	if hasMaster(ctx) {
+		db = us.GetMaster()
+	} else {
+		db = us.GetReplica()
+	}
+	row := db.Db.QueryRow(queryString, args...)
 
 	var user model.User
 	var props, notifyProps, timezone []byte
@@ -703,10 +717,10 @@ func (us SqlUserStore) GetProfilesInChannelByStatus(options *model.UserGetOption
 	return users, nil
 }
 
-func (us SqlUserStore) GetAllProfilesInChannel(channelId string, allowFromCache bool) (map[string]*model.User, error) {
+func (us SqlUserStore) GetAllProfilesInChannel(ctx context.Context, channelID string, allowFromCache bool) (map[string]*model.User, error) {
 	query := us.usersQuery.
 		Join("ChannelMembers cm ON ( cm.UserId = u.Id )").
-		Where("cm.ChannelId = ?", channelId).
+		Where("cm.ChannelId = ?", channelID).
 		Where("u.DeleteAt = 0").
 		OrderBy("u.Username ASC")
 
@@ -714,8 +728,15 @@ func (us SqlUserStore) GetAllProfilesInChannel(channelId string, allowFromCache
 	if err != nil {
 		return nil, errors.Wrap(err, "get_all_profiles_in_channel_tosql")
 	}
+	var db *gorp.DbMap
+	if hasMaster(ctx) {
+		db = us.GetMaster()
+	} else {
+		db = us.GetReplica()
+	}
+
 	var users []*model.User
-	rows, err := us.GetReplica().Db.Query(queryString, args...)
+	rows, err := db.Db.Query(queryString, args...)
 	if err != nil {
 		return nil, errors.Wrap(err, "failed to find Users")
 	}
@@ -914,7 +935,7 @@ func (us SqlUserStore) GetNewUsersForTeam(teamId string, offset, limit int, view
 	return users, nil
 }
 
-func (us SqlUserStore) GetProfileByIds(userIds []string, options *store.UserGetByIdsOpts, allowFromCache bool) ([]*model.User, error) {
+func (us SqlUserStore) GetProfileByIds(ctx context.Context, userIds []string, options *store.UserGetByIdsOpts, allowFromCache bool) ([]*model.User, error) {
 	if options == nil {
 		options = &store.UserGetByIdsOpts{}
 	}
@@ -939,7 +960,14 @@ func (us SqlUserStore) GetProfileByIds(userIds []string, options *store.UserGetB
 		return nil, errors.Wrap(err, "get_profile_by_ids_tosql")
 	}
 
-	if _, err := us.GetReplica().Select(&users, queryString, args...); err != nil {
+	var db *gorp.DbMap
+	if hasMaster(ctx) {
+		db = us.GetMaster()
+	} else {
+		db = us.GetReplica()
+	}
+
+	if _, err := db.Select(&users, queryString, args...); err != nil {
 		return nil, errors.Wrap(err, "failed to find Users")
 	}
 
@@ -1775,7 +1803,7 @@ func (us SqlUserStore) PromoteGuestToUser(userId string) error {
 	}
 	defer finalizeTransaction(transaction)
 
-	user, err := us.Get(userId)
+	user, err := us.Get(context.Background(), userId)
 	if err != nil {
 		return err
 	}
@@ -1837,76 +1865,80 @@ func (us SqlUserStore) PromoteGuestToUser(userId string) error {
 	return nil
 }
 
-func (us SqlUserStore) DemoteUserToGuest(userId string) error {
+func (us SqlUserStore) DemoteUserToGuest(userID string) (*model.User, error) {
 	transaction, err := us.GetMaster().Begin()
 	if err != nil {
-		return errors.Wrap(err, "begin_transaction")
+		return nil, errors.Wrap(err, "begin_transaction")
 	}
 	defer finalizeTransaction(transaction)
 
-	user, err := us.Get(userId)
+	user, err := us.Get(context.Background(), userID)
 	if err != nil {
-		return err
+		return nil, err
 	}
 
 	roles := user.GetRoles()
 
 	newRoles := []string{}
 	for _, role := range roles {
-		if role == "system_user" {
-			newRoles = append(newRoles, "system_guest")
-		} else if role != "system_admin" {
+		if role == model.SYSTEM_USER_ROLE_ID {
+			newRoles = append(newRoles, model.SYSTEM_GUEST_ROLE_ID)
+		} else if role != model.SYSTEM_ADMIN_ROLE_ID {
 			newRoles = append(newRoles, role)
 		}
 	}
 
 	curTime := model.GetMillis()
+	newRolesDBStr := strings.Join(newRoles, " ")
 	query := us.getQueryBuilder().Update("Users").
-		Set("Roles", strings.Join(newRoles, " ")).
+		Set("Roles", newRolesDBStr).
 		Set("UpdateAt", curTime).
-		Where(sq.Eq{"Id": userId})
+		Where(sq.Eq{"Id": userID})
 
 	queryString, args, err := query.ToSql()
 	if err != nil {
-		return errors.Wrap(err, "demote_user_to_guest_tosql")
+		return nil, errors.Wrap(err, "demote_user_to_guest_tosql")
 	}
 
 	if _, err = transaction.Exec(queryString, args...); err != nil {
-		return errors.Wrapf(err, "failed to update User with userId=%s", userId)
+		return nil, errors.Wrapf(err, "failed to update User with userId=%s", userID)
 	}
 
+	user.Roles = newRolesDBStr
+	user.UpdateAt = curTime
+
 	query = us.getQueryBuilder().Update("ChannelMembers").
 		Set("SchemeUser", false).
 		Set("SchemeGuest", true).
-		Where(sq.Eq{"UserId": userId})
+		Where(sq.Eq{"UserId": userID})
 
 	queryString, args, err = query.ToSql()
 	if err != nil {
-		return errors.Wrap(err, "demote_user_to_guest_tosql")
+		return nil, errors.Wrap(err, "demote_user_to_guest_tosql")
 	}
 
 	if _, err = transaction.Exec(queryString, args...); err != nil {
-		return errors.Wrapf(err, "failed to update ChannelMembers with userId=%s", userId)
+		return nil, errors.Wrapf(err, "failed to update ChannelMembers with userId=%s", userID)
 	}
 
 	query = us.getQueryBuilder().Update("TeamMembers").
 		Set("SchemeUser", false).
 		Set("SchemeGuest", true).
-		Where(sq.Eq{"UserId": userId})
+		Where(sq.Eq{"UserId": userID})
 
 	queryString, args, err = query.ToSql()
 	if err != nil {
-		return errors.Wrap(err, "demote_user_to_guest_tosql")
+		return nil, errors.Wrap(err, "demote_user_to_guest_tosql")
 	}
 
 	if _, err := transaction.Exec(queryString, args...); err != nil {
-		return errors.Wrapf(err, "failed to update TeamMembers with userId=%s", userId)
+		return nil, errors.Wrapf(err, "failed to update TeamMembers with userId=%s", userID)
 	}
 
 	if err := transaction.Commit(); err != nil {
-		return errors.Wrap(err, "commit_transaction")
+		return nil, errors.Wrap(err, "commit_transaction")
 	}
-	return nil
+	return user, nil
 }
 
 func (us SqlUserStore) AutocompleteUsersInChannel(teamId, channelId, term string, options *model.UserSearchOptions) (*model.UserAutocompleteInChannel, error) {

store/store.go

@@ -322,21 +322,21 @@ type UserStore interface {
 	UpdateAuthData(userId string, service string, authData *string, email string, resetMfa bool) (string, error)
 	UpdateMfaSecret(userId, secret string) error
 	UpdateMfaActive(userId string, active bool) error
-	Get(id string) (*model.User, error)
-	GetMany(ids []string) ([]*model.User, error)
+	Get(ctx context.Context, id string) (*model.User, error)
+	GetMany(ctx context.Context, ids []string) ([]*model.User, error)
 	GetAll() ([]*model.User, error)
 	ClearCaches()
 	InvalidateProfilesInChannelCacheByUser(userId string)
 	InvalidateProfilesInChannelCache(channelId string)
 	GetProfilesInChannel(options *model.UserGetOptions) ([]*model.User, error)
 	GetProfilesInChannelByStatus(options *model.UserGetOptions) ([]*model.User, error)
-	GetAllProfilesInChannel(channelId string, allowFromCache bool) (map[string]*model.User, error)
+	GetAllProfilesInChannel(ctx context.Context, channelId string, allowFromCache bool) (map[string]*model.User, error)
 	GetProfilesNotInChannel(teamId string, channelId string, groupConstrained bool, offset int, limit int, viewRestrictions *model.ViewUsersRestrictions) ([]*model.User, error)
 	GetProfilesWithoutTeam(options *model.UserGetOptions) ([]*model.User, error)
 	GetProfilesByUsernames(usernames []string, viewRestrictions *model.ViewUsersRestrictions) ([]*model.User, error)
 	GetAllProfiles(options *model.UserGetOptions) ([]*model.User, error)
 	GetProfiles(options *model.UserGetOptions) ([]*model.User, error)
-	GetProfileByIds(userIds []string, options *UserGetByIdsOpts, allowFromCache bool) ([]*model.User, error)
+	GetProfileByIds(ctx context.Context, userIds []string, options *UserGetByIdsOpts, allowFromCache bool) ([]*model.User, error)
 	GetProfileByGroupChannelIdsForUser(userId string, channelIds []string) (map[string][]*model.User, error)
 	InvalidateProfileCacheForUser(userId string)
 	GetByEmail(email string) (*model.User, error)
@@ -378,7 +378,7 @@ type UserStore interface {
 	GetTeamGroupUsers(teamID string) ([]*model.User, error)
 	GetChannelGroupUsers(channelID string) ([]*model.User, error)
 	PromoteGuestToUser(userID string) error
-	DemoteUserToGuest(userID string) error
+	DemoteUserToGuest(userID string) (*model.User, error)
 	DeactivateGuests() ([]string, error)
 	AutocompleteUsersInChannel(teamId, channelId, term string, options *model.UserSearchOptions) (*model.UserAutocompleteInChannel, error)
 	GetKnownUsers(userID string) ([]string, error)

store/storetest/mocks/UserStore.go

@@ -5,9 +5,12 @@
 package mocks
 
 import (
+	context "context"
+
 	model "github.com/mattermost/mattermost-server/v5/model"
-	store "github.com/mattermost/mattermost-server/v5/store"
 	mock "github.com/stretchr/testify/mock"
+
+	store "github.com/mattermost/mattermost-server/v5/store"
 )
 
 // UserStore is an autogenerated mock type for the UserStore type
@@ -228,26 +231,12 @@ func (_m *UserStore) DeactivateGuests() ([]string, error) {
 }
 
 // DemoteUserToGuest provides a mock function with given fields: userID
-func (_m *UserStore) DemoteUserToGuest(userID string) error {
+func (_m *UserStore) DemoteUserToGuest(userID string) (*model.User, error) {
 	ret := _m.Called(userID)
 
-	var r0 error
-	if rf, ok := ret.Get(0).(func(string) error); ok {
-		r0 = rf(userID)
-	} else {
-		r0 = ret.Error(0)
-	}
-
-	return r0
-}
-
-// Get provides a mock function with given fields: id
-func (_m *UserStore) Get(id string) (*model.User, error) {
-	ret := _m.Called(id)
-
 	var r0 *model.User
 	if rf, ok := ret.Get(0).(func(string) *model.User); ok {
-		r0 = rf(id)
+		r0 = rf(userID)
 	} else {
 		if ret.Get(0) != nil {
 			r0 = ret.Get(0).(*model.User)
@@ -256,7 +245,30 @@ func (_m *UserStore) Get(id string) (*model.User, error) {
 
 	var r1 error
 	if rf, ok := ret.Get(1).(func(string) error); ok {
-		r1 = rf(id)
+		r1 = rf(userID)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// Get provides a mock function with given fields: ctx, id
+func (_m *UserStore) Get(ctx context.Context, id string) (*model.User, error) {
+	ret := _m.Called(ctx, id)
+
+	var r0 *model.User
+	if rf, ok := ret.Get(0).(func(context.Context, string) *model.User); ok {
+		r0 = rf(ctx, id)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*model.User)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context, string) error); ok {
+		r1 = rf(ctx, id)
 	} else {
 		r1 = ret.Error(1)
 	}
@@ -356,13 +368,13 @@ func (_m *UserStore) GetAllProfiles(options *model.UserGetOptions) ([]*model.Use
 	return r0, r1
 }
 
-// GetAllProfilesInChannel provides a mock function with given fields: channelId, allowFromCache
-func (_m *UserStore) GetAllProfilesInChannel(channelId string, allowFromCache bool) (map[string]*model.User, error) {
-	ret := _m.Called(channelId, allowFromCache)
+// GetAllProfilesInChannel provides a mock function with given fields: ctx, channelId, allowFromCache
+func (_m *UserStore) GetAllProfilesInChannel(ctx context.Context, channelId string, allowFromCache bool) (map[string]*model.User, error) {
+	ret := _m.Called(ctx, channelId, allowFromCache)
 
 	var r0 map[string]*model.User
-	if rf, ok := ret.Get(0).(func(string, bool) map[string]*model.User); ok {
-		r0 = rf(channelId, allowFromCache)
+	if rf, ok := ret.Get(0).(func(context.Context, string, bool) map[string]*model.User); ok {
+		r0 = rf(ctx, channelId, allowFromCache)
 	} else {
 		if ret.Get(0) != nil {
 			r0 = ret.Get(0).(map[string]*model.User)
@@ -370,8 +382,8 @@ func (_m *UserStore) GetAllProfilesInChannel(channelId string, allowFromCache bo
 	}
 
 	var r1 error
-	if rf, ok := ret.Get(1).(func(string, bool) error); ok {
-		r1 = rf(channelId, allowFromCache)
+	if rf, ok := ret.Get(1).(func(context.Context, string, bool) error); ok {
+		r1 = rf(ctx, channelId, allowFromCache)
 	} else {
 		r1 = ret.Error(1)
 	}
@@ -603,13 +615,13 @@ func (_m *UserStore) GetKnownUsers(userID string) ([]string, error) {
 	return r0, r1
 }
 
-// GetMany provides a mock function with given fields: ids
-func (_m *UserStore) GetMany(ids []string) ([]*model.User, error) {
-	ret := _m.Called(ids)
+// GetMany provides a mock function with given fields: ctx, ids
+func (_m *UserStore) GetMany(ctx context.Context, ids []string) ([]*model.User, error) {
+	ret := _m.Called(ctx, ids)
 
 	var r0 []*model.User
-	if rf, ok := ret.Get(0).(func([]string) []*model.User); ok {
-		r0 = rf(ids)
+	if rf, ok := ret.Get(0).(func(context.Context, []string) []*model.User); ok {
+		r0 = rf(ctx, ids)
 	} else {
 		if ret.Get(0) != nil {
 			r0 = ret.Get(0).([]*model.User)
@@ -617,8 +629,8 @@ func (_m *UserStore) GetMany(ids []string) ([]*model.User, error) {
 	}
 
 	var r1 error
-	if rf, ok := ret.Get(1).(func([]string) error); ok {
-		r1 = rf(ids)
+	if rf, ok := ret.Get(1).(func(context.Context, []string) error); ok {
+		r1 = rf(ctx, ids)
 	} else {
 		r1 = ret.Error(1)
 	}
@@ -672,13 +684,13 @@ func (_m *UserStore) GetProfileByGroupChannelIdsForUser(userId string, channelId
 	return r0, r1
 }
 
-// GetProfileByIds provides a mock function with given fields: userIds, options, allowFromCache
-func (_m *UserStore) GetProfileByIds(userIds []string, options *store.UserGetByIdsOpts, allowFromCache bool) ([]*model.User, error) {
-	ret := _m.Called(userIds, options, allowFromCache)
+// GetProfileByIds provides a mock function with given fields: ctx, userIds, options, allowFromCache
+func (_m *UserStore) GetProfileByIds(ctx context.Context, userIds []string, options *store.UserGetByIdsOpts, allowFromCache bool) ([]*model.User, error) {
+	ret := _m.Called(ctx, userIds, options, allowFromCache)
 
 	var r0 []*model.User
-	if rf, ok := ret.Get(0).(func([]string, *store.UserGetByIdsOpts, bool) []*model.User); ok {
-		r0 = rf(userIds, options, allowFromCache)
+	if rf, ok := ret.Get(0).(func(context.Context, []string, *store.UserGetByIdsOpts, bool) []*model.User); ok {
+		r0 = rf(ctx, userIds, options, allowFromCache)
 	} else {
 		if ret.Get(0) != nil {
 			r0 = ret.Get(0).([]*model.User)
@@ -686,8 +698,8 @@ func (_m *UserStore) GetProfileByIds(userIds []string, options *store.UserGetByI
 	}
 
 	var r1 error
-	if rf, ok := ret.Get(1).(func([]string, *store.UserGetByIdsOpts, bool) error); ok {
-		r1 = rf(userIds, options, allowFromCache)
+	if rf, ok := ret.Get(1).(func(context.Context, []string, *store.UserGetByIdsOpts, bool) error); ok {
+		r1 = rf(ctx, userIds, options, allowFromCache)
 	} else {
 		r1 = ret.Error(1)
 	}

store/storetest/team_store.go

@@ -2829,7 +2829,7 @@ func testSaveTeamMemberMaxMembers(t *testing.T, ss store.Store) {
 	require.Equal(t, maxUsersPerTeam, int(totalMemberCount), "should have 5 team members again, had %v instead", totalMemberCount)
 
 	// Deactivating a user should make them stop counting against max members
-	user2, nErr := ss.User().Get(userIds[1])
+	user2, nErr := ss.User().Get(context.Background(), userIds[1])
 	require.NoError(t, nErr)
 	user2.DeleteAt = 1234
 	_, nErr = ss.User().Update(user2, true)

store/storetest/user_store.go

@@ -4,6 +4,7 @@
 package storetest
 
 import (
+	"context"
 	"errors"
 	"strings"
 	"testing"
@@ -226,7 +227,7 @@ func testUserStoreUpdateUpdateAt(t *testing.T, ss store.Store) {
 	_, err = ss.User().UpdateUpdateAt(u1.Id)
 	require.NoError(t, err)
 
-	user, err := ss.User().Get(u1.Id)
+	user, err := ss.User().Get(context.Background(), u1.Id)
 	require.NoError(t, err)
 	require.Less(t, u1.UpdateAt, user.UpdateAt, "UpdateAt not updated correctly")
 }
@@ -243,7 +244,7 @@ func testUserStoreUpdateFailedPasswordAttempts(t *testing.T, ss store.Store) {
 	err = ss.User().UpdateFailedPasswordAttempts(u1.Id, 3)
 	require.NoError(t, err)
 
-	user, err := ss.User().Get(u1.Id)
+	user, err := ss.User().Get(context.Background(), u1.Id)
 	require.NoError(t, err)
 	require.Equal(t, 3, user.FailedAttempts, "FailedAttempts not updated correctly")
 }
@@ -276,19 +277,19 @@ func testUserStoreGet(t *testing.T, ss store.Store) {
 	require.NoError(t, nErr)
 
 	t.Run("fetch empty id", func(t *testing.T) {
-		_, err := ss.User().Get("")
+		_, err := ss.User().Get(context.Background(), "")
 		require.Error(t, err)
 	})
 
 	t.Run("fetch user 1", func(t *testing.T) {
-		actual, err := ss.User().Get(u1.Id)
+		actual, err := ss.User().Get(context.Background(), u1.Id)
 		require.NoError(t, err)
 		require.Equal(t, u1, actual)
 		require.False(t, actual.IsBot)
 	})
 
 	t.Run("fetch user 2, also a bot", func(t *testing.T) {
-		actual, err := ss.User().Get(u2.Id)
+		actual, err := ss.User().Get(context.Background(), u2.Id)
 		require.NoError(t, err)
 		require.Equal(t, u2, actual)
 		require.True(t, actual.IsBot)
@@ -1272,7 +1273,7 @@ func testUserStoreGetAllProfilesInChannel(t *testing.T, ss store.Store) {
 
 	t.Run("all profiles in channel 1, no caching", func(t *testing.T) {
 		var profiles map[string]*model.User
-		profiles, err = ss.User().GetAllProfilesInChannel(c1.Id, false)
+		profiles, err = ss.User().GetAllProfilesInChannel(context.Background(), c1.Id, false)
 		require.NoError(t, err)
 		assert.Equal(t, map[string]*model.User{
 			u1.Id: sanitized(u1),
@@ -1283,7 +1284,7 @@ func testUserStoreGetAllProfilesInChannel(t *testing.T, ss store.Store) {
 
 	t.Run("all profiles in channel 2, no caching", func(t *testing.T) {
 		var profiles map[string]*model.User
-		profiles, err = ss.User().GetAllProfilesInChannel(c2.Id, false)
+		profiles, err = ss.User().GetAllProfilesInChannel(context.Background(), c2.Id, false)
 		require.NoError(t, err)
 		assert.Equal(t, map[string]*model.User{
 			u1.Id: sanitized(u1),
@@ -1292,7 +1293,7 @@ func testUserStoreGetAllProfilesInChannel(t *testing.T, ss store.Store) {
 
 	t.Run("all profiles in channel 2, caching", func(t *testing.T) {
 		var profiles map[string]*model.User
-		profiles, err = ss.User().GetAllProfilesInChannel(c2.Id, true)
+		profiles, err = ss.User().GetAllProfilesInChannel(context.Background(), c2.Id, true)
 		require.NoError(t, err)
 		assert.Equal(t, map[string]*model.User{
 			u1.Id: sanitized(u1),
@@ -1301,7 +1302,7 @@ func testUserStoreGetAllProfilesInChannel(t *testing.T, ss store.Store) {
 
 	t.Run("all profiles in channel 2, caching [repeated]", func(t *testing.T) {
 		var profiles map[string]*model.User
-		profiles, err = ss.User().GetAllProfilesInChannel(c2.Id, true)
+		profiles, err = ss.User().GetAllProfilesInChannel(context.Background(), c2.Id, true)
 		require.NoError(t, err)
 		assert.Equal(t, map[string]*model.User{
 			u1.Id: sanitized(u1),
@@ -1521,37 +1522,37 @@ func testUserStoreGetProfilesByIds(t *testing.T, ss store.Store) {
 	defer func() { require.NoError(t, ss.User().PermanentDelete(u4.Id)) }()
 
 	t.Run("get u1 by id, no caching", func(t *testing.T) {
-		users, err := ss.User().GetProfileByIds([]string{u1.Id}, nil, false)
+		users, err := ss.User().GetProfileByIds(context.Background(), []string{u1.Id}, nil, false)
 		require.NoError(t, err)
 		assert.Equal(t, []*model.User{u1}, users)
 	})
 
 	t.Run("get u1 by id, caching", func(t *testing.T) {
-		users, err := ss.User().GetProfileByIds([]string{u1.Id}, nil, true)
+		users, err := ss.User().GetProfileByIds(context.Background(), []string{u1.Id}, nil, true)
 		require.NoError(t, err)
 		assert.Equal(t, []*model.User{u1}, users)
 	})
 
 	t.Run("get u1, u2, u3 by id, no caching", func(t *testing.T) {
-		users, err := ss.User().GetProfileByIds([]string{u1.Id, u2.Id, u3.Id}, nil, false)
+		users, err := ss.User().GetProfileByIds(context.Background(), []string{u1.Id, u2.Id, u3.Id}, nil, false)
 		require.NoError(t, err)
 		assert.Equal(t, []*model.User{u1, u2, u3}, users)
 	})
 
 	t.Run("get u1, u2, u3 by id, caching", func(t *testing.T) {
-		users, err := ss.User().GetProfileByIds([]string{u1.Id, u2.Id, u3.Id}, nil, true)
+		users, err := ss.User().GetProfileByIds(context.Background(), []string{u1.Id, u2.Id, u3.Id}, nil, true)
 		require.NoError(t, err)
 		assert.Equal(t, []*model.User{u1, u2, u3}, users)
 	})
 
 	t.Run("get unknown id, caching", func(t *testing.T) {
-		users, err := ss.User().GetProfileByIds([]string{"123"}, nil, true)
+		users, err := ss.User().GetProfileByIds(context.Background(), []string{"123"}, nil, true)
 		require.NoError(t, err)
 		assert.Equal(t, []*model.User{}, users)
 	})
 
 	t.Run("should only return users with UpdateAt greater than the since time", func(t *testing.T) {
-		users, err := ss.User().GetProfileByIds([]string{u1.Id, u2.Id, u3.Id, u4.Id}, &store.UserGetByIdsOpts{
+		users, err := ss.User().GetProfileByIds(context.Background(), []string{u1.Id, u2.Id, u3.Id, u4.Id}, &store.UserGetByIdsOpts{
 			Since: u2.CreateAt,
 		}, true)
 		require.NoError(t, err)
@@ -4835,7 +4836,7 @@ func testUserStorePromoteGuestToUser(t *testing.T, ss store.Store) {
 
 		err = ss.User().PromoteGuestToUser(user.Id)
 		require.NoError(t, err)
-		updatedUser, err := ss.User().Get(user.Id)
+		updatedUser, err := ss.User().Get(context.Background(), user.Id)
 		require.NoError(t, err)
 		require.Equal(t, "system_user", updatedUser.Roles)
 		require.True(t, user.UpdateAt < updatedUser.UpdateAt)
@@ -4881,7 +4882,7 @@ func testUserStorePromoteGuestToUser(t *testing.T, ss store.Store) {
 
 		err = ss.User().PromoteGuestToUser(user.Id)
 		require.NoError(t, err)
-		updatedUser, err := ss.User().Get(user.Id)
+		updatedUser, err := ss.User().Get(context.Background(), user.Id)
 		require.NoError(t, err)
 		require.Equal(t, "system_user system_admin", updatedUser.Roles)
 
@@ -4912,7 +4913,7 @@ func testUserStorePromoteGuestToUser(t *testing.T, ss store.Store) {
 
 		err = ss.User().PromoteGuestToUser(user.Id)
 		require.NoError(t, err)
-		updatedUser, err := ss.User().Get(user.Id)
+		updatedUser, err := ss.User().Get(context.Background(), user.Id)
 		require.NoError(t, err)
 		require.Equal(t, "system_user", updatedUser.Roles)
 	})
@@ -4937,7 +4938,7 @@ func testUserStorePromoteGuestToUser(t *testing.T, ss store.Store) {
 
 		err = ss.User().PromoteGuestToUser(user.Id)
 		require.NoError(t, err)
-		updatedUser, err := ss.User().Get(user.Id)
+		updatedUser, err := ss.User().Get(context.Background(), user.Id)
 		require.NoError(t, err)
 		require.Equal(t, "system_user", updatedUser.Roles)
 
@@ -4977,7 +4978,7 @@ func testUserStorePromoteGuestToUser(t *testing.T, ss store.Store) {
 
 		err = ss.User().PromoteGuestToUser(user.Id)
 		require.NoError(t, err)
-		updatedUser, err := ss.User().Get(user.Id)
+		updatedUser, err := ss.User().Get(context.Background(), user.Id)
 		require.NoError(t, err)
 		require.Equal(t, "system_user", updatedUser.Roles)
 
@@ -5022,7 +5023,7 @@ func testUserStorePromoteGuestToUser(t *testing.T, ss store.Store) {
 
 		err = ss.User().PromoteGuestToUser(user.Id)
 		require.NoError(t, err)
-		updatedUser, err := ss.User().Get(user.Id)
+		updatedUser, err := ss.User().Get(context.Background(), user.Id)
 		require.NoError(t, err)
 		require.Equal(t, "system_user custom_role", updatedUser.Roles)
 
@@ -5088,7 +5089,7 @@ func testUserStorePromoteGuestToUser(t *testing.T, ss store.Store) {
 
 		err = ss.User().PromoteGuestToUser(user1.Id)
 		require.NoError(t, err)
-		updatedUser, err := ss.User().Get(user1.Id)
+		updatedUser, err := ss.User().Get(context.Background(), user1.Id)
 		require.NoError(t, err)
 		require.Equal(t, "system_user", updatedUser.Roles)
 
@@ -5102,7 +5103,7 @@ func testUserStorePromoteGuestToUser(t *testing.T, ss store.Store) {
 		require.False(t, updatedChannelMember.SchemeGuest)
 		require.True(t, updatedChannelMember.SchemeUser)
 
-		notUpdatedUser, err := ss.User().Get(user2.Id)
+		notUpdatedUser, err := ss.User().Get(context.Background(), user2.Id)
 		require.NoError(t, err)
 		require.Equal(t, "system_guest", notUpdatedUser.Roles)
 
@@ -5148,19 +5149,17 @@ func testUserStoreDemoteUserToGuest(t *testing.T, ss store.Store) {
 		_, nErr = ss.Channel().SaveMember(&model.ChannelMember{ChannelId: channel.Id, UserId: user.Id, SchemeGuest: false, SchemeUser: true, NotifyProps: model.GetDefaultChannelNotifyProps()})
 		require.NoError(t, nErr)
 
-		err = ss.User().DemoteUserToGuest(user.Id)
-		require.NoError(t, err)
-		updatedUser, err := ss.User().Get(user.Id)
+		updatedUser, err := ss.User().DemoteUserToGuest(user.Id)
 		require.NoError(t, err)
 		require.Equal(t, "system_guest", updatedUser.Roles)
 		require.True(t, user.UpdateAt < updatedUser.UpdateAt)
 
-		updatedTeamMember, nErr := ss.Team().GetMember(teamId, user.Id)
+		updatedTeamMember, nErr := ss.Team().GetMember(teamId, updatedUser.Id)
 		require.NoError(t, nErr)
 		require.True(t, updatedTeamMember.SchemeGuest)
 		require.False(t, updatedTeamMember.SchemeUser)
 
-		updatedChannelMember, nErr := ss.Channel().GetMember(channel.Id, user.Id)
+		updatedChannelMember, nErr := ss.Channel().GetMember(channel.Id, updatedUser.Id)
 		require.NoError(t, nErr)
 		require.True(t, updatedChannelMember.SchemeGuest)
 		require.False(t, updatedChannelMember.SchemeUser)
@@ -5194,9 +5193,7 @@ func testUserStoreDemoteUserToGuest(t *testing.T, ss store.Store) {
 		_, nErr = ss.Channel().SaveMember(&model.ChannelMember{ChannelId: channel.Id, UserId: user.Id, SchemeGuest: true, SchemeUser: false, NotifyProps: model.GetDefaultChannelNotifyProps()})
 		require.NoError(t, nErr)
 
-		err = ss.User().DemoteUserToGuest(user.Id)
-		require.NoError(t, err)
-		updatedUser, err := ss.User().Get(user.Id)
+		updatedUser, err := ss.User().DemoteUserToGuest(user.Id)
 		require.NoError(t, err)
 		require.Equal(t, "system_guest", updatedUser.Roles)
 
@@ -5225,9 +5222,7 @@ func testUserStoreDemoteUserToGuest(t *testing.T, ss store.Store) {
 		require.NoError(t, err)
 		defer func() { require.NoError(t, ss.User().PermanentDelete(user.Id)) }()
 
-		err = ss.User().DemoteUserToGuest(user.Id)
-		require.NoError(t, err)
-		updatedUser, err := ss.User().Get(user.Id)
+		updatedUser, err := ss.User().DemoteUserToGuest(user.Id)
 		require.NoError(t, err)
 		require.Equal(t, "system_guest", updatedUser.Roles)
 	})
@@ -5250,9 +5245,7 @@ func testUserStoreDemoteUserToGuest(t *testing.T, ss store.Store) {
 		_, nErr := ss.Team().SaveMember(&model.TeamMember{TeamId: teamId, UserId: user.Id, SchemeGuest: false, SchemeUser: true}, 999)
 		require.NoError(t, nErr)
 
-		err = ss.User().DemoteUserToGuest(user.Id)
-		require.NoError(t, err)
-		updatedUser, err := ss.User().Get(user.Id)
+		updatedUser, err := ss.User().DemoteUserToGuest(user.Id)
 		require.NoError(t, err)
 		require.Equal(t, "system_guest", updatedUser.Roles)
 
@@ -5290,9 +5283,7 @@ func testUserStoreDemoteUserToGuest(t *testing.T, ss store.Store) {
 		_, nErr = ss.Channel().SaveMember(&model.ChannelMember{ChannelId: channel.Id, UserId: user.Id, SchemeGuest: false, SchemeUser: true, NotifyProps: model.GetDefaultChannelNotifyProps()})
 		require.NoError(t, nErr)
 
-		err = ss.User().DemoteUserToGuest(user.Id)
-		require.NoError(t, err)
-		updatedUser, err := ss.User().Get(user.Id)
+		updatedUser, err := ss.User().DemoteUserToGuest(user.Id)
 		require.NoError(t, err)
 		require.Equal(t, "system_guest", updatedUser.Roles)
 
@@ -5335,9 +5326,7 @@ func testUserStoreDemoteUserToGuest(t *testing.T, ss store.Store) {
 		_, nErr = ss.Channel().SaveMember(&model.ChannelMember{ChannelId: channel.Id, UserId: user.Id, SchemeGuest: false, SchemeUser: true, NotifyProps: model.GetDefaultChannelNotifyProps()})
 		require.NoError(t, nErr)
 
-		err = ss.User().DemoteUserToGuest(user.Id)
-		require.NoError(t, err)
-		updatedUser, err := ss.User().Get(user.Id)
+		updatedUser, err := ss.User().DemoteUserToGuest(user.Id)
 		require.NoError(t, err)
 		require.Equal(t, "system_guest custom_role", updatedUser.Roles)
 
@@ -5401,9 +5390,7 @@ func testUserStoreDemoteUserToGuest(t *testing.T, ss store.Store) {
 		_, nErr = ss.Channel().SaveMember(&model.ChannelMember{ChannelId: channel.Id, UserId: user2.Id, SchemeGuest: false, SchemeUser: true, NotifyProps: model.GetDefaultChannelNotifyProps()})
 		require.NoError(t, nErr)
 
-		err = ss.User().DemoteUserToGuest(user1.Id)
-		require.NoError(t, err)
-		updatedUser, err := ss.User().Get(user1.Id)
+		updatedUser, err := ss.User().DemoteUserToGuest(user1.Id)
 		require.NoError(t, err)
 		require.Equal(t, "system_guest", updatedUser.Roles)
 
@@ -5417,7 +5404,7 @@ func testUserStoreDemoteUserToGuest(t *testing.T, ss store.Store) {
 		require.True(t, updatedChannelMember.SchemeGuest)
 		require.False(t, updatedChannelMember.SchemeUser)
 
-		notUpdatedUser, err := ss.User().Get(user2.Id)
+		notUpdatedUser, err := ss.User().Get(context.Background(), user2.Id)
 		require.NoError(t, err)
 		require.Equal(t, "system_user", notUpdatedUser.Roles)
 
@@ -5493,19 +5480,19 @@ func testDeactivateGuests(t *testing.T, ss store.Store) {
 		require.NoError(t, err)
 		assert.ElementsMatch(t, []string{guest1.Id, guest2.Id}, ids)
 
-		u, err := ss.User().Get(guest1.Id)
+		u, err := ss.User().Get(context.Background(), guest1.Id)
 		require.NoError(t, err)
 		assert.NotEqual(t, u.DeleteAt, int64(0))
 
-		u, err = ss.User().Get(guest2.Id)
+		u, err = ss.User().Get(context.Background(), guest2.Id)
 		require.NoError(t, err)
 		assert.NotEqual(t, u.DeleteAt, int64(0))
 
-		u, err = ss.User().Get(guest3.Id)
+		u, err = ss.User().Get(context.Background(), guest3.Id)
 		require.NoError(t, err)
 		assert.Equal(t, u.DeleteAt, int64(10))
 
-		u, err = ss.User().Get(regularUser.Id)
+		u, err = ss.User().Get(context.Background(), regularUser.Id)
 		require.NoError(t, err)
 		assert.Equal(t, u.DeleteAt, int64(0))
 	})
@@ -5523,7 +5510,7 @@ func testUserStoreResetLastPictureUpdate(t *testing.T, ss store.Store) {
 	err = ss.User().UpdateLastPictureUpdate(u1.Id)
 	require.NoError(t, err)
 
-	user, err := ss.User().Get(u1.Id)
+	user, err := ss.User().Get(context.Background(), u1.Id)
 	require.NoError(t, err)
 
 	assert.NotZero(t, user.LastPictureUpdate)
@@ -5537,7 +5524,7 @@ func testUserStoreResetLastPictureUpdate(t *testing.T, ss store.Store) {
 
 	ss.User().InvalidateProfileCacheForUser(u1.Id)
 
-	user2, err := ss.User().Get(u1.Id)
+	user2, err := ss.User().Get(context.Background(), u1.Id)
 	require.NoError(t, err)
 
 	assert.True(t, user2.UpdateAt > user.UpdateAt)

store/timerlayer/timerlayer.go

@@ -7574,10 +7574,10 @@ func (s *TimerLayerUserStore) DeactivateGuests() ([]string, error) {
 	return result, err
 }
 
-func (s *TimerLayerUserStore) DemoteUserToGuest(userID string) error {
+func (s *TimerLayerUserStore) DemoteUserToGuest(userID string) (*model.User, error) {
 	start := timemodule.Now()
 
-	err := s.UserStore.DemoteUserToGuest(userID)
+	result, err := s.UserStore.DemoteUserToGuest(userID)
 
 	elapsed := float64(timemodule.Since(start)) / float64(timemodule.Second)
 	if s.Root.Metrics != nil {
@@ -7587,13 +7587,13 @@ func (s *TimerLayerUserStore) DemoteUserToGuest(userID string) error {
 		}
 		s.Root.Metrics.ObserveStoreMethodDuration("UserStore.DemoteUserToGuest", success, elapsed)
 	}
-	return err
+	return result, err
 }
 
-func (s *TimerLayerUserStore) Get(id string) (*model.User, error) {
+func (s *TimerLayerUserStore) Get(ctx context.Context, id string) (*model.User, error) {
 	start := timemodule.Now()
 
-	result, err := s.UserStore.Get(id)
+	result, err := s.UserStore.Get(ctx, id)
 
 	elapsed := float64(timemodule.Since(start)) / float64(timemodule.Second)
 	if s.Root.Metrics != nil {
@@ -7670,10 +7670,10 @@ func (s *TimerLayerUserStore) GetAllProfiles(options *model.UserGetOptions) ([]*
 	return result, err
 }
 
-func (s *TimerLayerUserStore) GetAllProfilesInChannel(channelId string, allowFromCache bool) (map[string]*model.User, error) {
+func (s *TimerLayerUserStore) GetAllProfilesInChannel(ctx context.Context, channelId string, allowFromCache bool) (map[string]*model.User, error) {
 	start := timemodule.Now()
 
-	result, err := s.UserStore.GetAllProfilesInChannel(channelId, allowFromCache)
+	result, err := s.UserStore.GetAllProfilesInChannel(ctx, channelId, allowFromCache)
 
 	elapsed := float64(timemodule.Since(start)) / float64(timemodule.Second)
 	if s.Root.Metrics != nil {
@@ -7862,10 +7862,10 @@ func (s *TimerLayerUserStore) GetKnownUsers(userID string) ([]string, error) {
 	return result, err
 }
 
-func (s *TimerLayerUserStore) GetMany(ids []string) ([]*model.User, error) {
+func (s *TimerLayerUserStore) GetMany(ctx context.Context, ids []string) ([]*model.User, error) {
 	start := timemodule.Now()
 
-	result, err := s.UserStore.GetMany(ids)
+	result, err := s.UserStore.GetMany(ctx, ids)
 
 	elapsed := float64(timemodule.Since(start)) / float64(timemodule.Second)
 	if s.Root.Metrics != nil {
@@ -7910,10 +7910,10 @@ func (s *TimerLayerUserStore) GetProfileByGroupChannelIdsForUser(userId string,
 	return result, err
 }
 
-func (s *TimerLayerUserStore) GetProfileByIds(userIds []string, options *store.UserGetByIdsOpts, allowFromCache bool) ([]*model.User, error) {
+func (s *TimerLayerUserStore) GetProfileByIds(ctx context.Context, userIds []string, options *store.UserGetByIdsOpts, allowFromCache bool) ([]*model.User, error) {
 	start := timemodule.Now()
 
-	result, err := s.UserStore.GetProfileByIds(userIds, options, allowFromCache)
+	result, err := s.UserStore.GetProfileByIds(ctx, userIds, options, allowFromCache)
 
 	elapsed := float64(timemodule.Since(start)) / float64(timemodule.Second)
 	if s.Root.Metrics != nil {

web/context_test.go

@@ -4,6 +4,7 @@
 package web
 
 import (
+	"context"
 	"net/http"
 	"testing"
 
@@ -55,7 +56,7 @@ func TestMfaRequired(t *testing.T) {
 	mockStore := th.App.Srv().Store.(*mocks.Store)
 	mockUserStore := mocks.UserStore{}
 	mockUserStore.On("Count", mock.Anything).Return(int64(10), nil)
-	mockUserStore.On("Get", "userid").Return(nil, model.NewAppError("Userstore.Get", "storeerror", nil, "store error", http.StatusInternalServerError))
+	mockUserStore.On("Get", context.Background(), "userid").Return(nil, model.NewAppError("Userstore.Get", "storeerror", nil, "store error", http.StatusInternalServerError))
 	mockPostStore := mocks.PostStore{}
 	mockPostStore.On("GetMaxPostSize").Return(65535, nil)
 	mockSystemStore := mocks.SystemStore{}