]> git.rm.cloudns.org Git - xonotic/xonotic.git/commitdiff
Add our power levels Matrix bot.
authorRudolf Polzer <divVerent@gmail.com>
Mon, 7 Feb 2022 21:38:29 +0000 (22:38 +0100)
committerRudolf Polzer <divVerent@gmail.com>
Mon, 7 Feb 2022 21:38:29 +0000 (22:38 +0100)
misc/infrastructure/powerbot/bot.go [new file with mode: 0644]
misc/infrastructure/powerbot/db.go [new file with mode: 0644]
misc/infrastructure/powerbot/go.mod [new file with mode: 0644]
misc/infrastructure/powerbot/go.sum [new file with mode: 0644]
misc/infrastructure/powerbot/powerlevels.go [new file with mode: 0644]

diff --git a/misc/infrastructure/powerbot/bot.go b/misc/infrastructure/powerbot/bot.go
new file mode 100644 (file)
index 0000000..2917c1d
--- /dev/null
@@ -0,0 +1,267 @@
+package main
+
+import (
+       "encoding/json"
+       "fmt"
+       "io/ioutil"
+       "log"
+       "maunium.net/go/mautrix"
+       "maunium.net/go/mautrix/event"
+       "maunium.net/go/mautrix/id"
+       "strings"
+       "sync"
+       "time"
+)
+
+const (
+       syncInterval       = time.Minute
+       syncForceFrequency = 24 * 60
+)
+
+type Config struct {
+       Homeserver  string        `json:"homeserver"`
+       UserID      id.UserID     `json:"user_id"`
+       Password    string        `json:"password,omitempty"`
+       DeviceID    id.DeviceID   `json:"device_id,omitempty"`
+       AccessToken string        `json:"access_token,omitempty"`
+       Rooms       [][]id.RoomID `json:"rooms"`
+}
+
+func (c *Config) Load() error {
+       log.Printf("Loading config.")
+       data, err := ioutil.ReadFile("config.json")
+       if err != nil {
+               return err
+       }
+       return json.Unmarshal(data, c)
+}
+
+func (c *Config) Save() error {
+       log.Printf("Saving config.")
+       data, err := json.MarshalIndent(c, "", "\t")
+       if err != nil {
+               return err
+       }
+       return ioutil.WriteFile("config.json", data, 0700)
+}
+
+func Login(config *Config) (*mautrix.Client, error) {
+       // Note: we have to lower case the user ID for Matrix protocol communication.
+       uid := id.UserID(strings.ToLower(string(config.UserID)))
+       client, err := mautrix.NewClient(config.Homeserver, uid, config.AccessToken)
+       if err != nil {
+               return nil, fmt.Errorf("failed to create client: %v", err)
+       }
+       if config.AccessToken == "" {
+               resp, err := client.Login(&mautrix.ReqLogin{
+                       Type: mautrix.AuthTypePassword,
+                       Identifier: mautrix.UserIdentifier{
+                               Type: mautrix.IdentifierTypeUser,
+                               User: string(client.UserID),
+                       },
+                       Password:                 config.Password,
+                       InitialDeviceDisplayName: "matrixbot",
+                       StoreCredentials:         true,
+               })
+               if err != nil {
+                       return nil, fmt.Errorf("failed to authenticate: %v", err)
+               }
+               config.Password = ""
+               config.DeviceID = resp.DeviceID
+               config.AccessToken = resp.AccessToken
+               err = config.Save()
+               if err != nil {
+                       return nil, fmt.Errorf("failed to save config: %v", err)
+               }
+       } else {
+               client.DeviceID = config.DeviceID
+       }
+       return client, nil
+}
+
+var (
+       roomUsers       = map[id.RoomID]map[id.UserID]struct{}{}
+       roomUsersMu     sync.RWMutex
+       fullySynced     bool
+       roomPowerLevels = map[id.RoomID]*event.PowerLevelsEventContent{}
+)
+
+func setUserStateAt(room id.RoomID, user id.UserID, now time.Time, maxPrevState, state State) {
+       err := writeUserStateAt(room, user, now, maxPrevState, state)
+       if err != nil {
+               log.Fatalf("failed to write user state: %v", err)
+       }
+}
+
+func handleMessage(now time.Time, room id.RoomID, sender id.UserID, raw *event.Event) {
+       // log.Printf("[%v] Message from %v to %v", now, sender, room)
+       roomUsersMu.Lock()
+       roomUsers[room][sender] = struct{}{}
+       roomUsersMu.Unlock()
+       setUserStateAt(room, sender, now.Add(-activeTime), Active, Active)
+       setUserStateAt(room, sender, now, Active, Idle)
+}
+
+func handleJoin(now time.Time, room id.RoomID, member id.UserID, raw *event.Event) {
+       log.Printf("[%v] Join from %v to %v", now, member, room)
+       roomUsersMu.Lock()
+       roomUsers[room][member] = struct{}{}
+       roomUsersMu.Unlock()
+       setUserStateAt(room, member, now, NotActive, Idle)
+}
+
+func handleLeave(now time.Time, room id.RoomID, member id.UserID, raw *event.Event) {
+       log.Printf("[%v] Leave from %v to %v", now, member, room)
+       roomUsersMu.Lock()
+       delete(roomUsers[room], member)
+       roomUsersMu.Unlock()
+       setUserStateAt(room, member, now, Active, NotActive)
+}
+
+func handlePowerLevels(now time.Time, room id.RoomID, levels *event.PowerLevelsEventContent, raw *event.Event) {
+       // log.Printf("[%v] Power levels for %v are %v", now, room, levels)
+       levelsCopy := *levels // Looks like mautrix always passes the same pointer here.
+       roomUsersMu.Lock()
+       roomPowerLevels[room] = &levelsCopy
+       roomUsersMu.Unlock()
+}
+
+func eventTime(evt *event.Event) time.Time {
+       return time.Unix(0, evt.Timestamp*1000000)
+}
+
+type MoreMessagesSyncer struct {
+       *mautrix.DefaultSyncer
+}
+
+func newSyncer() *MoreMessagesSyncer {
+       return &MoreMessagesSyncer{
+               DefaultSyncer: mautrix.NewDefaultSyncer(),
+       }
+}
+
+func (s *MoreMessagesSyncer) GetFilterJSON(userID id.UserID) *mautrix.Filter {
+       f := s.DefaultSyncer.GetFilterJSON(userID)
+       // Same filters as Element.
+       f.Room.Timeline.Limit = 20
+       // Only include our rooms.
+       f.Room.Rooms = make([]id.RoomID, 0, len(roomUsers))
+       for room := range roomUsers {
+               f.Room.Rooms = append(f.Room.Rooms, room)
+       }
+       return f
+}
+
+func isRoom(room id.RoomID) bool {
+       roomUsersMu.RLock()
+       defer roomUsersMu.RUnlock()
+       _, found := roomUsers[room]
+       return found
+}
+
+func Run() (err error) {
+       err = InitDatabase()
+       if err != nil {
+               return fmt.Errorf("failed to init database: %v", err)
+       }
+       defer func() {
+               err2 := CloseDatabase()
+               if err2 != nil && err == nil {
+                       err = fmt.Errorf("failed to close database: %v", err)
+               }
+       }()
+       logPowerLevelBounds()
+       config := &Config{}
+       err = config.Load()
+       if err != nil {
+               return fmt.Errorf("failed to load config: %v", err)
+       }
+       for _, group := range config.Rooms {
+               for _, room := range group {
+                       roomUsers[room] = map[id.UserID]struct{}{}
+               }
+       }
+       client, err := Login(config)
+       if err != nil {
+               return fmt.Errorf("failed to login: %v", err)
+       }
+       syncer := newSyncer()
+       syncer.OnEventType(event.EventMessage, func(source mautrix.EventSource, evt *event.Event) {
+               if !isRoom(evt.RoomID) {
+                       return
+               }
+               handleMessage(eventTime(evt), evt.RoomID, evt.Sender, evt)
+       })
+       syncer.OnEventType(event.StateMember, func(source mautrix.EventSource, evt *event.Event) {
+               if !isRoom(evt.RoomID) {
+                       return
+               }
+               mem := evt.Content.AsMember()
+               switch mem.Membership {
+               case event.MembershipJoin:
+                       handleJoin(eventTime(evt), evt.RoomID, evt.Sender, evt)
+               case event.MembershipLeave:
+                       handleLeave(eventTime(evt), evt.RoomID, evt.Sender, evt)
+               default: // Ignore.
+               }
+       })
+       syncer.OnEventType(event.StatePowerLevels, func(source mautrix.EventSource, evt *event.Event) {
+               if !isRoom(evt.RoomID) {
+                       return
+               }
+               handlePowerLevels(eventTime(evt), evt.RoomID, evt.Content.AsPowerLevels(), evt)
+       })
+       syncer.OnSync(func(resp *mautrix.RespSync, since string) bool {
+               // j, _ := json.MarshalIndent(resp, "", "  ")
+               // log.Print(string(j))
+               roomUsersMu.Lock()
+               if since != "" && !fullySynced {
+                       log.Print("Fully synced.")
+                       for room, users := range roomUsers {
+                               if len(users) == 0 {
+                                       log.Printf("Not actually joined %v yet...", room)
+                                       _, err := client.JoinRoom(string(room), "", nil)
+                                       if err != nil {
+                                               log.Printf("Failed to join %v: %v", room, err)
+                                       }
+                               }
+                       }
+                       fullySynced = true
+               }
+               roomUsersMu.Unlock()
+               return true
+       })
+       client.Syncer = syncer
+       ticker := time.NewTicker(syncInterval)
+       defer ticker.Stop()
+       go func() {
+               counter := 0
+               for range ticker.C {
+                       roomUsersMu.RLock()
+                       scoreData := map[id.RoomID]map[id.UserID]*Score{}
+                       now := time.Now()
+                       for room := range roomUsers {
+                               scores, err := queryUserScores(room, now)
+                               if err != nil {
+                                       log.Fatalf("failed to query user scores: %v", err)
+                               }
+                               scoreData[room] = scores
+                       }
+                       for _, group := range config.Rooms {
+                               for _, room := range group {
+                                       syncPowerLevels(client, room, group, scoreData, counter%syncForceFrequency == 0)
+                               }
+                       }
+                       roomUsersMu.RUnlock()
+                       counter++
+               }
+       }()
+       return client.Sync()
+}
+
+func main() {
+       err := Run()
+       if err != nil {
+               log.Fatalf("Program failed: %v", err)
+       }
+}
diff --git a/misc/infrastructure/powerbot/db.go b/misc/infrastructure/powerbot/db.go
new file mode 100644 (file)
index 0000000..d16e11a
--- /dev/null
@@ -0,0 +1,182 @@
+package main
+
+import (
+       "database/sql"
+       "fmt"
+       "maunium.net/go/mautrix/id"
+       _ "modernc.org/sqlite"
+       "time"
+)
+
+type State int
+
+const (
+       NotActive State = iota
+       Idle
+       Active
+)
+
+type Score struct {
+       LastEvent    time.Time
+       CurrentState State
+       Idle         time.Duration
+       Active       time.Duration
+}
+
+const dbSchema = `
+CREATE TABLE IF NOT EXISTS room_users (
+  room_id STRING NOT NULL,
+  user_id STRING NOT NULL,
+  state_time TIMESTAMP NOT NULL,
+  state INT NOT NULL,
+  idle_nsec INT64 NOT NULL,
+  active_nsec INT64 NOT NULL,
+  PRIMARY KEY(room_id, user_id)
+);
+`
+
+const fetchStateQuery = `
+SELECT state_time, state, idle_nsec, active_nsec
+FROM room_users
+WHERE room_id = ?
+  AND user_id = ?
+`
+
+const insertStateQuery = `
+INSERT INTO room_users(room_id, user_id, state_time, state, idle_nsec, active_nsec)
+VALUES(?, ?, ?, ?, 0.0, 0.0)
+`
+
+const updateStateQuery = `
+UPDATE room_users
+SET state_time = ?, state = ?, idle_nsec = ?, active_nsec = ?
+WHERE room_id = ?
+  AND user_id = ?
+`
+
+const fetchUserScoresQuery = `
+SELECT user_id, state_time, state, idle_nsec, active_nsec
+FROM room_users
+WHERE room_id = ?
+`
+
+var db *sql.DB
+
+func InitDatabase() error {
+       var err error
+       db, err = sql.Open("sqlite", "users.sqlite")
+       if err != nil {
+               return fmt.Errorf("could not open SQLite database: %v", err)
+       }
+       _, err = db.Exec(dbSchema)
+       if err != nil {
+               return fmt.Errorf("could not set SQLite database schema: %v", err)
+       }
+       return nil
+}
+
+func CloseDatabase() error {
+       return db.Close()
+}
+
+func queryUserScores(room id.RoomID, now time.Time) (map[id.UserID]*Score, error) {
+       var users map[id.UserID]*Score
+       err := retryPolicy(func() error {
+               rows, err := db.Query(fetchUserScoresQuery, room)
+               if err != nil {
+                       return fmt.Errorf("could not query users: %v", err)
+               }
+               users = map[id.UserID]*Score{}
+               for rows.Next() {
+                       var user id.UserID
+                       var score Score
+                       if err := rows.Scan(&user, &score.LastEvent, &score.CurrentState, &score.Idle, &score.Active); err != nil {
+                               return fmt.Errorf("could not scan users query result: %v", err)
+                       }
+                       newScore := advanceScore(score, now)
+                       users[user] = &newScore
+               }
+               if err := rows.Err(); err != nil {
+                       return fmt.Errorf("could not read users: %v", err)
+               }
+               return nil
+       })
+       return users, err
+}
+
+func advanceScore(score Score, now time.Time) Score {
+       if !now.After(score.LastEvent) {
+               return score
+       }
+       dt := now.Sub(score.LastEvent)
+       switch score.CurrentState {
+       case Idle:
+               score.Idle += dt
+       case Active:
+               score.Active += dt
+       }
+       return score
+}
+
+func retryPolicy(f func() error) error {
+       var err error
+       for attempt := 0; attempt < 12; attempt++ {
+               err = f()
+               if err == nil {
+                       return nil
+               }
+               time.Sleep(time.Millisecond * time.Duration(1<<attempt))
+       }
+       return err
+}
+
+func inTx(db *sql.DB, f func(tx *sql.Tx) error) error {
+       tx, err := db.Begin()
+       if err != nil {
+               return fmt.Errorf("failed to create transaction: %v", err)
+       }
+       err = f(tx)
+       if err != nil {
+               tx.Rollback()
+               return err
+       }
+       return tx.Commit()
+}
+
+func writeUserStateAt(room id.RoomID, user id.UserID, now time.Time, maxPrevState, state State) error {
+       return retryPolicy(func() error {
+               return inTx(db, func(tx *sql.Tx) error {
+                       row := tx.QueryRow(fetchStateQuery, room, user)
+                       var score Score
+                       err := row.Scan(&score.LastEvent, &score.CurrentState, &score.Idle, &score.Active)
+                       if err == sql.ErrNoRows {
+                               _, err = tx.Exec(insertStateQuery, room, user, now, state)
+                               if err != nil {
+                                       return fmt.Errorf("failed to set state for new user: %v", err)
+                               }
+                               return nil
+                       } else {
+                               if err != nil {
+                                       return fmt.Errorf("failed to fetch state for user: %v", err)
+                               }
+                               if now.After(score.LastEvent) {
+                                       if score.CurrentState > maxPrevState {
+                                               score.CurrentState = maxPrevState
+                                       }
+                                       score = advanceScore(score, now)
+                                       _, err = tx.Exec(updateStateQuery, now, state, score.Idle, score.Active, room, user)
+                                       if err != nil {
+                                               return fmt.Errorf("failed to update state for new user: %v", err)
+                                       }
+                                       return nil
+                               } else {
+                                       _, err = tx.Exec(updateStateQuery, score.LastEvent, state, score.Idle, score.Active, room, user)
+                                       if err != nil {
+                                               return fmt.Errorf("failed to update state for new user: %v", err)
+                                       }
+                                       return nil
+                               }
+                       }
+               })
+       })
+}
diff --git a/misc/infrastructure/powerbot/go.mod b/misc/infrastructure/powerbot/go.mod
new file mode 100644 (file)
index 0000000..bd6c064
--- /dev/null
@@ -0,0 +1,43 @@
+module github.com/divVerent/matrixbot
+
+go 1.15
+
+require (
+       github.com/btcsuite/btcutil v1.0.2 // indirect
+       github.com/davecgh/go-spew v1.1.1 // indirect
+       github.com/dustin/go-humanize v1.0.0 // indirect
+       github.com/google/go-cmp v0.5.7
+       github.com/google/uuid v1.3.0 // indirect
+       github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51 // indirect
+       github.com/kr/pretty v0.3.0 // indirect
+       github.com/kr/text v0.2.0 // indirect
+       github.com/mattn/go-isatty v0.0.14 // indirect
+       github.com/mattn/go-sqlite3 v1.14.11 // indirect
+       github.com/pmezard/go-difflib v1.0.0 // indirect
+       github.com/remyoudompheng/bigfft v0.0.0-20200410134404-eec4a21b6bb0 // indirect
+       github.com/rogpeppe/go-internal v1.8.1 // indirect
+       github.com/stretchr/testify v1.7.0 // indirect
+       golang.org/x/crypto v0.0.0-20220128200615-198e4374d7ed // indirect
+       golang.org/x/mod v0.5.1 // indirect
+       golang.org/x/net v0.0.0-20220127200216-cd36cc0744dd // indirect
+       golang.org/x/sys v0.0.0-20220128215802-99c3d69c2c27 // indirect
+       golang.org/x/tools v0.1.9 // indirect
+       golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
+       gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect
+       gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect
+       lukechampine.com/uint128 v1.2.0 // indirect
+       maunium.net/go/mautrix v0.10.10
+       modernc.org/cc/v3 v3.35.22 // indirect
+       modernc.org/ccgo/v3 v3.15.13 // indirect
+       modernc.org/ccorpus v1.11.4 // indirect
+       modernc.org/httpfs v1.0.6 // indirect
+       modernc.org/libc v1.14.5 // indirect
+       modernc.org/mathutil v1.4.1 // indirect
+       modernc.org/memory v1.0.5 // indirect
+       modernc.org/opt v0.1.1 // indirect
+       modernc.org/sqlite v1.14.5
+       modernc.org/strutil v1.1.1 // indirect
+       modernc.org/tcl v1.11.0 // indirect
+       modernc.org/token v1.0.0 // indirect
+       modernc.org/z v1.3.0 // indirect
+)
diff --git a/misc/infrastructure/powerbot/go.sum b/misc/infrastructure/powerbot/go.sum
new file mode 100644 (file)
index 0000000..2d64a35
--- /dev/null
@@ -0,0 +1,308 @@
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diff --git a/misc/infrastructure/powerbot/powerlevels.go b/misc/infrastructure/powerbot/powerlevels.go
new file mode 100644 (file)
index 0000000..0f4ab97
--- /dev/null
@@ -0,0 +1,176 @@
+package main
+
+import (
+       "github.com/google/go-cmp/cmp"
+       "log"
+       "math"
+       "maunium.net/go/mautrix"
+       "maunium.net/go/mautrix/event"
+       "maunium.net/go/mautrix/id"
+       "time"
+)
+
+const (
+       idleScore   = 1
+       activeScore = 100
+       activeTime  = 5 * time.Minute
+       // 15 minutes idling = PL 1.
+       minPowerScore = 15 * 60 * idleScore
+       minPowerLevel = 1
+       // 1 year fulltime active dev = PL 10.
+       maxPowerScore = 3600 * (365*24*idleScore + 8*261*(activeScore-idleScore))
+       maxPowerLevel = 9
+       // Expire power level if no event for 1 month. Level comes back on next event, including join.
+       powerExpireTime = time.Hour * 24 * 30
+       // Maximum count of ACL entries. Should avoid hitting the 64k limit.
+       maxPowerLevelEntries = 2048
+)
+
+func logPowerLevelBounds() {
+       for i := minPowerLevel; i <= maxPowerLevel; i++ {
+               score := minPowerScore * math.Pow(maxPowerScore/minPowerScore, float64(i-minPowerLevel)/float64(maxPowerLevel-minPowerLevel))
+               log.Printf("Power level %d requires score %v (= %v idle or %v active).",
+                       i, score,
+                       time.Duration(float64(time.Second)*score/idleScore),
+                       time.Duration(float64(time.Second)*score/activeScore),
+               )
+       }
+}
+
+func computePowerLevel(def int, score Score) (int, float64) {
+       points := score.Idle.Seconds()*idleScore + score.Active.Seconds()*activeScore
+       if points <= 0 {
+               return def, math.Inf(-1)
+       }
+       raw := minPowerLevel + (maxPowerLevel-minPowerLevel)*math.Log(points/minPowerScore)/math.Log(maxPowerScore/minPowerScore)
+       if raw < minPowerLevel {
+               return def, raw
+       }
+       if points > maxPowerScore {
+               return maxPowerLevel, raw
+       }
+       return int(math.Floor(raw)), raw
+}
+
+func allPowerLevels(roomLevels *event.PowerLevelsEventContent) []int {
+       ret := make([]int, 0, len(roomLevels.Events)+5)
+       for _, level := range roomLevels.Events {
+               ret = append(ret, level)
+       }
+       ret = append(ret, roomLevels.EventsDefault)
+       if roomLevels.InvitePtr != nil {
+               ret = append(ret, *roomLevels.InvitePtr)
+       }
+       if roomLevels.KickPtr != nil {
+               ret = append(ret, *roomLevels.KickPtr)
+       }
+       if roomLevels.BanPtr != nil {
+               ret = append(ret, *roomLevels.BanPtr)
+       }
+       if roomLevels.RedactPtr != nil {
+               ret = append(ret, *roomLevels.RedactPtr)
+       }
+       return ret
+}
+
+func syncPowerLevels(client *mautrix.Client, room id.RoomID, roomGroup []id.RoomID, scores map[id.RoomID]map[id.UserID]*Score, force bool) {
+       roomLevels := roomPowerLevels[room]
+       if roomLevels == nil {
+               log.Printf("trying to ensure power levels for room %v, but did not get power level map yet", room)
+               return
+       }
+       tryUpdate := force
+       for _, level := range allPowerLevels(roomLevels) {
+               if minPowerLevel <= level && level <= maxPowerLevel {
+                       tryUpdate = true
+               }
+       }
+       if !tryUpdate {
+               log.Printf("room %v skipping because PLs currently do not matter", room)
+               return
+       }
+       log.Printf("room %v considering to update PLs", room)
+       if fullySynced {
+               for user, score := range scores[room] {
+                       // Expire users that for some reason did not get pruned from the database.
+                       // This may cause them to lose their power level below.
+                       if _, found := roomUsers[room][user]; !found && score.CurrentState != NotActive {
+                               log.Printf("Pruning long inactive user %v from room %v.", user, room)
+                               setUserStateAt(room, user, time.Now(), NotActive, NotActive)
+                               score.CurrentState = NotActive
+                       }
+               }
+       }
+       newRoomLevels := *roomLevels
+       newRoomLevels.Users = make(map[id.UserID]int)
+       for user, level := range roomLevels.Users {
+               if level == roomLevels.UsersDefault {
+                       continue
+               }
+               // TODO: Also skip users who aren't in the room for ages.
+               score := scores[room][user]
+               if level >= minPowerLevel && level <= maxPowerLevel && score.CurrentState == NotActive && time.Now().After(score.LastEvent.Add(powerExpireTime)) {
+                       // User is inactive - prune them from the power level list. Saves space.
+                       // But this doesn't mark the list dirty as there is no need to send an update.
+                       log.Printf("room %v user %v power level: PRUNE %v (%v)", room, user, level, score)
+                       continue
+               }
+               newRoomLevels.Users[user] = level
+       }
+       dirty := false
+       log.Printf("room %v", room)
+       for user, score := range scores[room] {
+               if score.CurrentState == NotActive {
+                       // Do not add/bump power levels for users not in the room.
+                       continue
+               }
+               prevLevel := roomLevels.Users[user]
+               level, raw := computePowerLevel(roomLevels.UsersDefault, *score)
+               for _, otherRoom := range roomGroup {
+                       if otherRoom == room {
+                               continue
+                       }
+                       otherScore := scores[otherRoom][user]
+                       if otherScore == nil {
+                               continue
+                       }
+                       otherLevel, otherRaw := computePowerLevel(roomLevels.UsersDefault, *otherScore)
+                       if otherLevel > level {
+                               level = otherLevel
+                       }
+                       if otherRaw > raw {
+                               raw = otherRaw
+                       }
+               }
+               if level > prevLevel {
+                       log.Printf("room %v user %v power level: INCREASE %v -> %v (%v, %v)", room, user, prevLevel, level, raw, score)
+                       newRoomLevels.Users[user] = level
+                       dirty = true
+               } else if level < prevLevel {
+                       log.Printf("room %v user %v power level: SKIP %v -> %v (%v, %v)", room, user, prevLevel, level, raw, score)
+               } else {
+                       log.Printf("room %v user %v power level: KEEP %v -> %v (%v, %v)", room, user, prevLevel, level, raw, score)
+               }
+       }
+       clearPowerLevel := minPowerLevel
+       for len(newRoomLevels.Users) > maxPowerLevelEntries && clearPowerLevel <= maxPowerLevel {
+               log.Printf("room %v not including power level %d to reduce message size", clearPowerLevel)
+               for user, level := range newRoomLevels.Users {
+                       if level == clearPowerLevel {
+                               delete(newRoomLevels.Users, user)
+                               dirty = true
+                       }
+               }
+               clearPowerLevel++
+       }
+       if dirty {
+               diff := cmp.Diff(roomLevels.Users, newRoomLevels.Users)
+               log.Printf("room %v power level update:\n%v", room, diff)
+               _, err := client.SendStateEvent(room, event.StatePowerLevels, "", newRoomLevels)
+               if err != nil {
+                       log.Printf("Failed to update power levels: %v", err)
+               }
+       } else {
+               log.Printf("room %v nothing to update", room)
+       }
+}