Save delivery receipts in DB

This avoids loosing history on restart for clients that don't
support chathistory.

Closes: https://todo.sr.ht/~emersion/soju/80

db.go

@@ -120,6 +120,13 @@ type Channel struct {
 	DetachOn      MessageFilter
 }
 
+type DeliveryReceipt struct {
+	ID            int64
+	Target        string // channel or nick
+	Client        string
+	InternalMsgID string
+}
+
 const schema = `
 CREATE TABLE User (
 	id INTEGER PRIMARY KEY,
@@ -161,6 +168,16 @@ CREATE TABLE Channel (
 	FOREIGN KEY(network) REFERENCES Network(id),
 	UNIQUE(network, name)
 );
+
+CREATE TABLE DeliveryReceipt (
+	id INTEGER PRIMARY KEY,
+	network INTEGER NOT NULL,
+	target VARCHAR(255) NOT NULL,
+	client VARCHAR(255),
+	internal_msgid VARCHAR(255) NOT NULL,
+	FOREIGN KEY(network) REFERENCES Network(id),
+	UNIQUE(network, target, client)
+);
 `
 
 var migrations = []string{
@@ -217,6 +234,17 @@ var migrations = []string{
 		ALTER TABLE Channel ADD COLUMN detach_after INTEGER NOT NULL DEFAULT 0;
 		ALTER TABLE Channel ADD COLUMN detach_on INTEGER NOT NULL DEFAULT 0;
 	`,
+	`
+		CREATE TABLE DeliveryReceipt (
+			id INTEGER PRIMARY KEY,
+			network INTEGER NOT NULL,
+			target VARCHAR(255) NOT NULL,
+			client VARCHAR(255),
+			internal_msgid VARCHAR(255) NOT NULL,
+			FOREIGN KEY(network) REFERENCES Network(id),
+			UNIQUE(network, target, client)
+		);
+	`,
 }
 
 type DB struct {
@@ -578,3 +606,65 @@ func (db *DB) DeleteChannel(id int64) error {
 	_, err := db.db.Exec("DELETE FROM Channel WHERE id = ?", id)
 	return err
 }
+
+func (db *DB) ListDeliveryReceipts(networkID int64) ([]DeliveryReceipt, error) {
+	db.lock.RLock()
+	defer db.lock.RUnlock()
+
+	rows, err := db.db.Query(`SELECT id, target, client, internal_msgid
+		FROM DeliveryReceipt
+		WHERE network = ?`, networkID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var receipts []DeliveryReceipt
+	for rows.Next() {
+		var rcpt DeliveryReceipt
+		var client sql.NullString
+		if err := rows.Scan(&rcpt.ID, &rcpt.Target, &client, &rcpt.InternalMsgID); err != nil {
+			return nil, err
+		}
+		rcpt.Client = client.String
+		receipts = append(receipts, rcpt)
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+
+	return receipts, nil
+}
+
+func (db *DB) StoreClientDeliveryReceipts(networkID int64, client string, receipts []DeliveryReceipt) error {
+	db.lock.Lock()
+	defer db.lock.Unlock()
+
+	tx, err := db.db.Begin()
+	if err != nil {
+		return err
+	}
+	defer tx.Rollback()
+
+	_, err = tx.Exec("DELETE FROM DeliveryReceipt WHERE network = ? AND client = ?",
+		networkID, toNullString(client))
+	if err != nil {
+		return err
+	}
+
+	for i := range receipts {
+		rcpt := &receipts[i]
+
+		res, err := tx.Exec("INSERT INTO DeliveryReceipt(network, target, client, internal_msgid) VALUES (?, ?, ?, ?)",
+			networkID, rcpt.Target, toNullString(client), rcpt.InternalMsgID)
+		if err != nil {
+			return err
+		}
+		rcpt.ID, err = res.LastInsertId()
+		if err != nil {
+			return err
+		}
+	}
+
+	return tx.Commit()
+}

upstream.go

@@ -1752,9 +1752,9 @@ func (uc *upstreamConn) appendLog(entity string, msg *irc.Message) (msgID string
 			return ""
 		}
 
-		for clientName, _ := range uc.user.clientNames {
+		uc.network.delivered.ForEachClient(func(clientName string) {
 			uc.network.delivered.StoreID(entity, clientName, lastID)
-		}
+		})
 	}
 
 	msgID, err := uc.user.msgStore.Append(uc.network, entityCM, msg)

user.go

@@ -92,6 +92,20 @@ func (ds deliveredStore) ForEachTarget(f func(target string)) {
 	}
 }
 
+func (ds deliveredStore) ForEachClient(f func(clientName string)) {
+	clients := make(map[string]struct{})
+	for _, entry := range ds.m.innerMap {
+		delivered := entry.value.(deliveredClientMap)
+		for clientName := range delivered {
+			clients[clientName] = struct{}{}
+		}
+	}
+
+	for clientName := range clients {
+		f(clientName)
+	}
+}
+
 type network struct {
 	Network
 	user    *user
@@ -298,6 +312,28 @@ func (net *network) updateCasemapping(newCasemap casemapping) {
 	}
 }
 
+func (net *network) storeClientDeliveryReceipts(clientName string) {
+	if !net.user.hasPersistentMsgStore() {
+		return
+	}
+
+	var receipts []DeliveryReceipt
+	net.delivered.ForEachTarget(func(target string) {
+		msgID := net.delivered.LoadID(target, clientName)
+		if msgID == "" {
+			return
+		}
+		receipts = append(receipts, DeliveryReceipt{
+			Target:        target,
+			InternalMsgID: msgID,
+		})
+	})
+
+	if err := net.user.srv.db.StoreClientDeliveryReceipts(net.ID, clientName, receipts); err != nil {
+		net.user.srv.Logger.Printf("failed to store delivery receipts for user %q, client %q, network %q: %v", net.user.Username, clientName, net.GetName(), err)
+	}
+}
+
 type user struct {
 	User
 	srv *Server
@@ -308,7 +344,6 @@ type user struct {
 	networks        []*network
 	downstreamConns []*downstreamConn
 	msgStore        messageStore
-	clientNames     map[string]struct{}
 
 	// LIST commands in progress
 	pendingLISTs []pendingLIST
@@ -334,7 +369,6 @@ func newUser(srv *Server, record *User) *user {
 		events:   make(chan event, 64),
 		done:     make(chan struct{}),
 		msgStore: msgStore,
-		clientNames: make(map[string]struct{}),
 	}
 }
 
@@ -407,6 +441,18 @@ func (u *user) run() {
 		network := newNetwork(u, &record, channels)
 		u.networks = append(u.networks, network)
 
+		if u.hasPersistentMsgStore() {
+			receipts, err := u.srv.db.ListDeliveryReceipts(record.ID)
+			if err != nil {
+				u.srv.Logger.Printf("failed to load delivery receipts for user %q, network %q: %v", u.Username, network.GetName(), err)
+				return
+			}
+
+			for _, rcpt := range receipts {
+				network.delivered.StoreID(rcpt.Target, rcpt.Client, rcpt.InternalMsgID)
+			}
+		}
+
 		go network.run()
 	}
 
@@ -489,8 +535,6 @@ func (u *user) run() {
 			u.forEachUpstream(func(uc *upstreamConn) {
 				uc.updateAway()
 			})
-
-			u.clientNames[dc.clientName] = struct{}{}
 		case eventDownstreamDisconnected:
 			dc := e.dc
 
@@ -501,6 +545,10 @@ func (u *user) run() {
 				}
 			}
 
+			dc.forEachNetwork(func(net *network) {
+				net.storeClientDeliveryReceipts(dc.clientName)
+			})
+
 			u.forEachUpstream(func(uc *upstreamConn) {
 				uc.updateAway()
 			})
@@ -524,6 +572,10 @@ func (u *user) run() {
 			})
 			for _, n := range u.networks {
 				n.stop()
+
+				n.delivered.ForEachClient(func(clientName string) {
+					n.storeClientDeliveryReceipts(clientName)
+				})
 			}
 			return
 		default:
@@ -665,3 +717,11 @@ func (u *user) stop() {
 	u.events <- eventStop{}
 	<-u.done
 }
+
+func (u *user) hasPersistentMsgStore() bool {
+	if u.msgStore == nil {
+		return false
+	}
+	_, isMem := u.msgStore.(*memoryMessageStore)
+	return !isMem
+}