Move history storage to matrix package. Fixes #90

14 files changed, 343 insertions, 105 deletions

diff --git a/config/config.go b/config/config.go
index 0ddb4a3..a3127c4 100644
--- a/config/config.go
+++ b/config/config.go
@@ -53,11 +53,11 @@ type Config struct {
 	AccessToken string `yaml:"access_token"`
 	HS          string `yaml:"homeserver"`
 
-	Dir        string `yaml:"-"`
-	CacheDir   string `yaml:"cache_dir"`
-	HistoryDir string `yaml:"history_dir"`
-	MediaDir   string `yaml:"media_dir"`
-	StateDir   string `yaml:"state_dir"`
+	Dir         string `yaml:"-"`
+	CacheDir    string `yaml:"cache_dir"`
+	HistoryPath string `yaml:"history_path"`
+	MediaDir    string `yaml:"media_dir"`
+	StateDir    string `yaml:"state_dir"`
 
 	Preferences UserPreferences        `yaml:"-"`
 	AuthCache   AuthCache              `yaml:"-"`
@@ -70,11 +70,11 @@ type Config struct {
 // NewConfig creates a config that loads data from the given directory.
 func NewConfig(configDir, cacheDir string) *Config {
 	return &Config{
-		Dir:        configDir,
-		CacheDir:   cacheDir,
-		HistoryDir: filepath.Join(cacheDir, "history"),
-		StateDir:   filepath.Join(cacheDir, "state"),
-		MediaDir:   filepath.Join(cacheDir, "media"),
+		Dir:         configDir,
+		CacheDir:    cacheDir,
+		HistoryPath: filepath.Join(cacheDir, "history.db"),
+		StateDir:    filepath.Join(cacheDir, "state"),
+		MediaDir:    filepath.Join(cacheDir, "media"),
 
 		Rooms: make(map[string]*rooms.Room),
 	}
@@ -82,7 +82,7 @@ func NewConfig(configDir, cacheDir string) *Config {
 
 // Clear clears the session cache and removes all history.
 func (config *Config) Clear() {
-	os.RemoveAll(config.HistoryDir)
+	os.Remove(config.HistoryPath)
 	os.RemoveAll(config.StateDir)
 	os.RemoveAll(config.MediaDir)
 	os.RemoveAll(config.CacheDir)
@@ -91,7 +91,6 @@ func (config *Config) Clear() {
 
 func (config *Config) CreateCacheDirs() {
 	os.MkdirAll(config.CacheDir, 0700)
-	os.MkdirAll(config.HistoryDir, 0700)
 	os.MkdirAll(config.StateDir, 0700)
 	os.MkdirAll(config.MediaDir, 0700)
 }
diff --git a/go.mod b/go.mod
index ebfca9d..1122fea 100644
--- a/go.mod
+++ b/go.mod
@@ -11,6 +11,7 @@ require (
 	github.com/nu7hatch/gouuid v0.0.0-20131221200532-179d4d0c4d8d // indirect
 	github.com/russross/blackfriday/v2 v2.0.1
 	github.com/shurcooL/sanitized_anchor_name v1.0.0 // indirect
+	go.etcd.io/bbolt v1.3.2
 	golang.org/x/image v0.0.0-20190321063152-3fc05d484e9f
 	golang.org/x/net v0.0.0-20190327214358-63eda1eb0650
 	gopkg.in/toast.v1 v1.0.0-20180812000517-0a84660828b2
diff --git a/go.sum b/go.sum
index 54dc719..483338f 100644
--- a/go.sum
+++ b/go.sum
@@ -21,6 +21,8 @@ github.com/shurcooL/sanitized_anchor_name v1.0.0 h1:PdmoCO6wvbs+7yrJyMORt4/BmY5I
 github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
 github.com/zyedidia/clipboard v0.0.0-20180718195219-bd31d747117d h1:Lhqt2eo+rgM8aswvM7nTtAMVm8ARPWzkE9n6eZDOccY=
 github.com/zyedidia/clipboard v0.0.0-20180718195219-bd31d747117d/go.mod h1:WDk3p8GiZV9+xFWlSo8qreeoLhW6Ik692rqXk+cNeRY=
+go.etcd.io/bbolt v1.3.2 h1:Z/90sZLPOeCy2PwprqkFa25PdkusRzaj9P8zm/KNyvk=
+go.etcd.io/bbolt v1.3.2/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20190325154230-a5d413f7728c/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/image v0.0.0-20180708004352-c73c2afc3b81/go.mod h1:ux5Hcp/YLpHSI86hEcLt0YII63i6oz57MZXIpbrjZUs=
diff --git a/gomuks.go b/gomuks.go
index 3e30035..8d5ac76 100644
--- a/gomuks.go
+++ b/gomuks.go
@@ -61,8 +61,8 @@ func NewGomuks(uiProvider ifc.UIProvider) *Gomuks {
 // Save saves the active session and message history.
 func (gmx *Gomuks) Save() {
 	gmx.config.SaveAll()
-	debug.Print("Saving history...")
-	gmx.ui.MainView().SaveAllHistory()
+	//debug.Print("Saving history...")
+	//gmx.ui.MainView().SaveAllHistory()
 }
 
 // StartAutosave calls Save() every minute until it receives a stop signal
diff --git a/interface/matrix.go b/interface/matrix.go
index 2f457bf..bfce8b5 100644
--- a/interface/matrix.go
+++ b/interface/matrix.go
@@ -41,7 +41,8 @@ type MatrixContainer interface {
 	JoinRoom(roomID, server string) (*rooms.Room, error)
 	LeaveRoom(roomID string) error
 
-	GetHistory(roomID, prevBatch string, limit int) ([]*mautrix.Event, string, error)
+	GetHistory(room *rooms.Room, limit int) ([]*mautrix.Event, error)
+	GetEvent(room *rooms.Room, eventID string) (*mautrix.Event, error)
 	GetRoom(roomID string) *rooms.Room
 
 	Download(mxcURL string) ([]byte, string, string, error)
diff --git a/interface/ui.go b/interface/ui.go
index 9091e36..df9d959 100644
--- a/interface/ui.go
+++ b/interface/ui.go
@@ -46,7 +46,6 @@ type MainView interface {
 	AddRoom(room *rooms.Room)
 	RemoveRoom(room *rooms.Room)
 	SetRooms(rooms map[string]*rooms.Room)
-	SaveAllHistory()
 
 	UpdateTags(room *rooms.Room)
 
@@ -67,8 +66,6 @@ const (
 
 type RoomView interface {
 	MxRoom() *rooms.Room
-	SaveHistory(dir string) error
-	LoadHistory(matrix MatrixContainer, dir string) (int, error)
 
 	SetCompletions(completions []string)
 	SetTyping(users []string)
diff --git a/matrix/history.go b/matrix/history.go
new file mode 100644
index 0000000..1b99125
--- /dev/null
+++ b/matrix/history.go
@@ -0,0 +1,247 @@
+// gomuks - A terminal Matrix client written in Go.
+// Copyright (C) 2019 Tulir Asokan
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package matrix
+
+import (
+	"bytes"
+	"encoding/binary"
+	"encoding/gob"
+	"sync"
+
+	bolt "go.etcd.io/bbolt"
+
+	"maunium.net/go/gomuks/matrix/rooms"
+	"maunium.net/go/mautrix"
+)
+
+type HistoryManager struct {
+	sync.Mutex
+
+	db *bolt.DB
+
+	historyEndPtr  map[*rooms.Room]uint64
+	historyLoadPtr map[*rooms.Room]uint64
+}
+
+var bucketRoomStreams = []byte("room_streams")
+var bucketRoomEventIDs = []byte("room_event_ids")
+var bucketStreamPointers = []byte("room_stream_pointers")
+
+const halfUint64 = ^uint64(0) >> 1
+
+func NewHistoryManager(dbPath string) (*HistoryManager, error) {
+	hm := &HistoryManager{
+		historyEndPtr:  make(map[*rooms.Room]uint64),
+		historyLoadPtr: make(map[*rooms.Room]uint64),
+	}
+	db, err := bolt.Open(dbPath, 0600, nil)
+	if err != nil {
+		return nil, err
+	}
+	err = db.Update(func(tx *bolt.Tx) error {
+		_, err = tx.CreateBucketIfNotExists(bucketRoomStreams)
+		if err != nil {
+			return err
+		}
+		_, err = tx.CreateBucketIfNotExists(bucketRoomEventIDs)
+		if err != nil {
+			return err
+		}
+		_, err = tx.CreateBucketIfNotExists(bucketStreamPointers)
+		if err != nil {
+			return err
+		}
+		return nil
+	})
+	if err != nil {
+		return nil, err
+	}
+	hm.db = db
+	return hm, nil
+}
+
+func (hm *HistoryManager) Close() error {
+	return hm.db.Close()
+}
+
+func (hm *HistoryManager) Get(room *rooms.Room, eventID string) (event *mautrix.Event, err error) {
+	err = hm.db.View(func(tx *bolt.Tx) error {
+		rid := []byte(room.ID)
+		eventIDs := tx.Bucket(bucketRoomEventIDs).Bucket(rid)
+		if eventIDs == nil {
+			return nil
+		}
+		streamIndex := eventIDs.Get([]byte(eventID))
+		if streamIndex == nil {
+			return nil
+		}
+		stream := tx.Bucket(bucketRoomStreams).Bucket(rid)
+		eventData := stream.Get(streamIndex)
+		var umErr error
+		event, umErr = unmarshalEvent(eventData)
+		return umErr
+	})
+	return
+}
+
+func (hm *HistoryManager) Append(room *rooms.Room, events []*mautrix.Event) error {
+	return hm.store(room, events, true)
+}
+
+func (hm *HistoryManager) Prepend(room *rooms.Room, events []*mautrix.Event) error {
+	return hm.store(room, events, false)
+}
+
+func (hm *HistoryManager) store(room *rooms.Room, events []*mautrix.Event, append bool) error {
+	hm.Lock()
+	defer hm.Unlock()
+	err := hm.db.Update(func(tx *bolt.Tx) error {
+		streamPointers := tx.Bucket(bucketStreamPointers)
+		rid := []byte(room.ID)
+		stream, err := tx.Bucket(bucketRoomStreams).CreateBucketIfNotExists(rid)
+		if err != nil {
+			return err
+		}
+		eventIDs, err := tx.Bucket(bucketRoomEventIDs).CreateBucketIfNotExists(rid)
+		if err != nil {
+			return err
+		}
+		if stream.Sequence() < halfUint64 {
+			// The sequence counter (i.e. the future) the part after 2^63, i.e. the second half of uint64
+			// We set it to -1 because NextSequence will increment it by one.
+			err = stream.SetSequence(halfUint64 - 1)
+			if err != nil {
+				return err
+			}
+		}
+		if append {
+			ptrStart, err := stream.NextSequence()
+			if err != nil {
+				return err
+			}
+			for i, event := range events {
+				if err := put(stream, eventIDs, event, ptrStart+uint64(i)); err != nil {
+					return err
+				}
+			}
+			err = stream.SetSequence(ptrStart + uint64(len(events)) - 1)
+			if err != nil {
+				return err
+			}
+		} else {
+			ptrStart, ok := hm.historyEndPtr[room]
+			if !ok {
+				ptrStartRaw := streamPointers.Get(rid)
+				if ptrStartRaw != nil {
+					ptrStart = btoi(ptrStartRaw)
+				} else {
+					ptrStart = halfUint64 - 1
+				}
+			}
+			eventCount := uint64(len(events))
+			for i, event := range events {
+				if err := put(stream, eventIDs, event, -ptrStart-uint64(i)); err != nil {
+					return err
+				}
+			}
+			hm.historyEndPtr[room] = ptrStart + eventCount
+			err := streamPointers.Put(rid, itob(ptrStart+eventCount))
+			if err != nil {
+				return err
+			}
+		}
+
+		return nil
+	})
+	return err
+}
+
+func (hm *HistoryManager) Load(room *rooms.Room, num int) (events []*mautrix.Event, err error) {
+	hm.Lock()
+	defer hm.Unlock()
+	err = hm.db.View(func(tx *bolt.Tx) error {
+		rid := []byte(room.ID)
+		stream := tx.Bucket(bucketRoomStreams).Bucket(rid)
+		if stream == nil {
+			return nil
+		}
+		ptrStart, ok := hm.historyLoadPtr[room]
+		if !ok {
+			ptrStart = stream.Sequence()
+		}
+		c := stream.Cursor()
+		k, v := c.Seek(itob(ptrStart - uint64(num)))
+		ptrStartFound := btoi(k)
+		if k == nil || ptrStartFound >= ptrStart {
+			return nil
+		}
+		hm.historyLoadPtr[room] = ptrStartFound - 1
+		for ; k != nil && btoi(k) < ptrStart; k, v = c.Next() {
+			event, parseError := unmarshalEvent(v)
+			if parseError != nil {
+				return parseError
+			}
+			events = append(events, event)
+		}
+		return nil
+	})
+	// Reverse array because we read/append the history in reverse order.
+	i := 0
+	j := len(events) - 1
+	for i < j {
+		events[i], events[j] = events[j], events[i]
+		i++
+		j--
+	}
+	return
+}
+
+func itob(v uint64) []byte {
+	b := make([]byte, 8)
+	binary.BigEndian.PutUint64(b, v)
+	return b
+}
+
+func btoi(b []byte) uint64 {
+	return binary.BigEndian.Uint64(b)
+}
+
+func marshalEvent(event *mautrix.Event) ([]byte, error) {
+	var buf bytes.Buffer
+	err := gob.NewEncoder(&buf).Encode(event)
+	return buf.Bytes(), err
+}
+
+func unmarshalEvent(data []byte) (*mautrix.Event, error) {
+	event := &mautrix.Event{}
+	return event, gob.NewDecoder(bytes.NewReader(data)).Decode(event)
+}
+
+func put(streams, eventIDs *bolt.Bucket, event *mautrix.Event, key uint64) error {
+	data, err := marshalEvent(event)
+	if err != nil {
+		return err
+	}
+	keyBytes := itob(key)
+	if err = streams.Put(keyBytes, data); err != nil {
+		return err
+	}
+	if err = eventIDs.Put([]byte(event.ID), keyBytes); err != nil {
+		return err
+	}
+	return nil
+}
diff --git a/matrix/matrix.go b/matrix/matrix.go
index 9527451..6985659 100644
--- a/matrix/matrix.go
+++ b/matrix/matrix.go
@@ -50,6 +50,7 @@ type Container struct {
 	gmx     ifc.Gomuks
 	ui      ifc.GomuksUI
 	config  *config.Config
+	history *HistoryManager
 	running bool
 	stop    chan bool
 
@@ -102,6 +103,11 @@ func (c *Container) InitClient() error {
 	}
 	c.client.Logger = mxLogger{}
 
+	c.history, err = NewHistoryManager(c.config.HistoryPath)
+	if err != nil {
+		return err
+	}
+
 	allowInsecure := len(os.Getenv("GOMUKS_ALLOW_INSECURE_CONNECTIONS")) > 0
 	if allowInsecure {
 		c.client.Client = &http.Client{
@@ -158,6 +164,11 @@ func (c *Container) Stop() {
 		debug.Print("Stopping Matrix container...")
 		c.stop <- true
 		c.client.StopSync()
+		debug.Print("Closing history manager...")
+		err := c.history.Close()
+		if err != nil {
+			debug.Print("Error closing history manager:", err)
+		}
 	}
 }
 
@@ -281,6 +292,11 @@ func (c *Container) HandleMessage(source EventSource, evt *mautrix.Event) {
 		return
 	}
 
+	err := c.history.Append(roomView.MxRoom(), []*mautrix.Event{evt})
+	if err != nil {
+		debug.Printf("Failed to add event %s to history: %v", evt.ID, err)
+	}
+
 	message := mainView.ParseEvent(roomView, evt)
 	if message != nil {
 		roomView.AddMessage(message, ifc.AppendMessage)
@@ -537,12 +553,42 @@ func (c *Container) LeaveRoom(roomID string) error {
 }
 
 // GetHistory fetches room history.
-func (c *Container) GetHistory(roomID, prevBatch string, limit int) ([]*mautrix.Event, string, error) {
-	resp, err := c.client.Messages(roomID, prevBatch, "", 'b', limit)
+func (c *Container) GetHistory(room *rooms.Room, limit int) ([]*mautrix.Event, error) {
+	events, err := c.history.Load(room, limit)
 	if err != nil {
-		return nil, "", err
+		return nil, err
+	}
+	if len(events) > 0 {
+		debug.Printf("Loaded %d events for %s from local cache", len(events), room.ID)
+		return events, nil
+	}
+	resp, err := c.client.Messages(room.ID, room.PrevBatch, "", 'b', limit)
+	if err != nil {
+		return nil, err
+	}
+	if len(resp.Chunk) > 0 {
+		err = c.history.Prepend(room, resp.Chunk)
+		if err != nil {
+			return nil, err
+		}
+	}
+	room.PrevBatch = resp.End
+	debug.Printf("Loaded %d events for %s from server from %s to %s", len(resp.Chunk), room.ID, resp.Start, resp.End)
+	return resp.Chunk, nil
+}
+
+func (c *Container) GetEvent(room *rooms.Room, eventID string) (*mautrix.Event, error) {
+	event, err := c.history.Get(room, eventID)
+	if event != nil || err != nil {
+		debug.Printf("Found event %s in local cache", eventID)
+		return event, err
+	}
+	event, err = c.client.GetEvent(room.ID, eventID)
+	if err != nil {
+		return nil, err
 	}
-	return resp.Chunk, resp.End, nil
+	debug.Printf("Loaded event %s from server", eventID)
+	return event, nil
 }
 
 // GetRoom gets the room instance stored in the session.
diff --git a/matrix/rooms/room.go b/matrix/rooms/room.go
index 16d4a9e..47f5602 100644
--- a/matrix/rooms/room.go
+++ b/matrix/rooms/room.go
@@ -57,6 +57,7 @@ type UnreadMessage struct {
 	Highlight bool
 }
 
+
 // Room represents a single Matrix room.
 type Room struct {
 	*mautrix.Room
@@ -74,6 +75,7 @@ type Room struct {
 	UnreadMessages   []UnreadMessage
 	unreadCountCache *int
 	highlightCache   *bool
+	lastMarkedRead   string
 	// Whether or not this room is marked as a direct chat.
 	IsDirect bool
 
@@ -142,7 +144,11 @@ func (room *Room) Save(path string) error {
 }
 
 // MarkRead clears the new message statuses on this room.
-func (room *Room) MarkRead(eventID string) {
+func (room *Room) MarkRead(eventID string) bool {
+	if room.lastMarkedRead == eventID {
+		return false
+	}
+	room.lastMarkedRead = eventID
 	readToIndex := -1
 	for index, unreadMessage := range room.UnreadMessages {
 		if unreadMessage.EventID == eventID {
@@ -154,6 +160,7 @@ func (room *Room) MarkRead(eventID string) {
 		room.highlightCache = nil
 		room.unreadCountCache = nil
 	}
+	return true
 }
 
 func (room *Room) UnreadCount() int {
diff --git a/ui/commands.go b/ui/commands.go
index bc07779..a8b1faa 100644
--- a/ui/commands.go
+++ b/ui/commands.go
@@ -113,10 +113,10 @@ func cmdHelp(cmd *Command) {
 /join <room address> - Join a room.
 /leave               - Leave the current room.
 
-/invite <user id>        - Invite a user.
-/kick <user id> [reason] - Kick a user.
-/ban <user id> [reason]  - Ban a user.
-/unban <user id>         - Unban a user.
+/invite <user id>          - Invite a user.
+/kick   <user id> [reason] - Kick a user.
+/ban    <user id> [reason] - Ban a user.
+/unban  <user id>          - Unban a user.
 
 /send     <room id> <type>         <json> - Send a custom event to the given room.
 /msend              <type>         <json> - Send a custom event to the current room.
diff --git a/ui/message-view.go b/ui/message-view.go
index d90a3a7..91f4621 100644
--- a/ui/message-view.go
+++ b/ui/message-view.go
@@ -17,10 +17,8 @@
 package ui
 
 import (
-	"encoding/gob"
 	"fmt"
 	"math"
-	"os"
 	"strings"
 
 	"github.com/mattn/go-runewidth"
@@ -84,55 +82,6 @@ func NewMessageView(parent *RoomView) *MessageView {
 	}
 }
 
-func (view *MessageView) SaveHistory(path string) error {
-	file, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE, 0600)
-	if err != nil {
-		return err
-	}
-	defer file.Close()
-
-	enc := gob.NewEncoder(file)
-	err = enc.Encode(view.messages)
-	if err != nil {
-		return err
-	}
-
-	return nil
-}
-
-func (view *MessageView) LoadHistory(matrix ifc.MatrixContainer, path string) (int, error) {
-	file, err := os.OpenFile(path, os.O_RDONLY, 0600)
-	if err != nil {
-		if os.IsNotExist(err) {
-			return 0, nil
-		}
-		return -1, err
-	}
-	defer file.Close()
-
-	var msgs []messages.UIMessage
-
-	dec := gob.NewDecoder(file)
-	err = dec.Decode(&msgs)
-	if err != nil {
-		return -1, err
-	}
-
-	view.messages = make([]messages.UIMessage, len(msgs))
-	indexOffset := 0
-	for index, message := range msgs {
-		if message != nil {
-			view.messages[index-indexOffset] = message
-			view.updateWidestSender(message.Sender())
-			message.RegisterMatrix(matrix)
-		} else {
-			indexOffset++
-		}
-	}
-
-	return len(view.messages), nil
-}
-
 func (view *MessageView) updateWidestSender(sender string) {
 	if len(sender) > view.widestSender {
 		view.widestSender = len(sender)
diff --git a/ui/messages/parser/parser.go b/ui/messages/parser/parser.go
index b36fde0..79e628a 100644
--- a/ui/messages/parser/parser.go
+++ b/ui/messages/parser/parser.go
@@ -106,7 +106,7 @@ func ParseMessage(matrix ifc.MatrixContainer, room *rooms.Room, evt *mautrix.Eve
 		if len(roomID) == 0 {
 			roomID = room.ID
 		}
-		replyToEvt, _ := matrix.Client().GetEvent(roomID, evt.Content.GetReplyTo())
+		replyToEvt, _ := matrix.GetEvent(room, evt.Content.GetReplyTo())
 		if replyToEvt != nil {
 			replyToEvt.Content.RemoveReplyFallback()
 			if len(replyToEvt.Content.FormattedBody) == 0 {
diff --git a/ui/room-view.go b/ui/room-view.go
index bc9c0cc..1a1ae78 100644
--- a/ui/room-view.go
+++ b/ui/room-view.go
@@ -119,14 +119,6 @@ func (view *RoomView) logPath(dir string) string {
 	return filepath.Join(dir, fmt.Sprintf("%s.gmxlog", view.Room.ID))
 }
 
-func (view *RoomView) SaveHistory(dir string) error {
-	return view.MessageView().SaveHistory(view.logPath(dir))
-}
-
-func (view *RoomView) LoadHistory(matrix ifc.MatrixContainer, dir string) (int, error) {
-	return view.MessageView().LoadHistory(matrix, view.logPath(dir))
-}
-
 func (view *RoomView) SetInputSubmitFunc(fn func(room *RoomView, text string)) *RoomView {
 	view.inputSubmitFunc = fn
 	return view
diff --git a/ui/view-main.go b/ui/view-main.go
index f726af5..382d9c8 100644
--- a/ui/view-main.go
+++ b/ui/view-main.go
@@ -122,9 +122,12 @@ func (view *MainView) BumpFocus(roomView *RoomView) {
 func (view *MainView) MarkRead(roomView *RoomView) {
 	if roomView != nil && roomView.Room.HasNewMessages() && roomView.MessageView().ScrollOffset == 0 {
 		msgList := roomView.MessageView().messages
-		msg := msgList[len(msgList)-1]
-		roomView.Room.MarkRead(msg.ID())
-		view.matrix.MarkRead(roomView.Room.ID, msg.ID())
+		if len(msgList) > 0 {
+			msg := msgList[len(msgList)-1]
+			if roomView.Room.MarkRead(msg.ID()) {
+				view.matrix.MarkRead(roomView.Room.ID, msg.ID())
+			}
+		}
 	}
 }
 
@@ -301,14 +304,8 @@ func (view *MainView) SwitchRoom(tag string, room *rooms.Room) {
 	view.MarkRead(roomView)
 	view.roomList.SetSelected(tag, room)
 	view.parent.Render()
-}
-
-func (view *MainView) SaveAllHistory() {
-	for _, room := range view.rooms {
-		err := room.SaveHistory(view.config.HistoryDir)
-		if err != nil {
-			debug.Printf("Failed to save history of %s: %v", room.Room.GetTitle(), err)
-		}
+	if len(roomView.MessageView().messages) == 0 {
+		go view.LoadHistory(room.ID)
 	}
 }
 
@@ -320,10 +317,11 @@ func (view *MainView) addRoomPage(room *rooms.Room) {
 		view.rooms[room.ID] = roomView
 		roomView.UpdateUserList()
 
-		_, err := roomView.LoadHistory(view.matrix, view.config.HistoryDir)
+		// FIXME
+		/*_, err := roomView.LoadHistory(view.matrix, view.config.HistoryDir)
 		if err != nil {
 			debug.Printf("Failed to load history of %s: %v", roomView.Room.GetTitle(), err)
-		}
+		}*/
 	}
 }
 
@@ -465,24 +463,23 @@ func (view *MainView) LoadHistory(room string) {
 		return
 	}
 
-	debug.Print("Fetching history for", room, "starting from", batch)
-	history, prevBatch, err := view.matrix.GetHistory(roomView.Room.ID, batch, 50)
+	history, err := view.matrix.GetHistory(roomView.Room, 50)
 	if err != nil {
 		roomView.AddServiceMessage("Failed to fetch history")
 		debug.Print("Failed to fetch history for", roomView.Room.ID, err)
 		return
 	}
-	roomView.Room.PrevBatch = prevBatch
 	for _, evt := range history {
 		message := view.ParseEvent(roomView, evt)
 		if message != nil {
 			roomView.AddMessage(message, ifc.PrependMessage)
 		}
 	}
-	err = roomView.SaveHistory(view.config.HistoryDir)
+	// TODO?
+	/*err = roomView.SaveHistory(view.config.HistoryDir)
 	if err != nil {
 		debug.Printf("Failed to save history of %s: %v", roomView.Room.GetTitle(), err)
-	}
+	}*/
 	view.config.PutRoom(roomView.Room)
 	view.parent.Render()
 }