Add a database store for messages

This adds a new config option, `logs db`, which enables storing chat logs in the soju database. Regular store options, CHATHISTORY options, and SEARCH operations are supported, like the fs logs backend. Messages are stored in a new table, Message. In order to track the list of targets we have messages for in an optimized manner, another database is used: MessageTarget. All new requests are backend by indexes so should be fast even with hundreds of thousands of messages. A contrib script is provided for migrating existing logs fs chat logs to the database. It can be run with eg: go run ./contrib/migrate-logs/ logs/ sqlite3:soju.db Co-authored-by: Simon Ser <contact@emersion.fr>
2022-12-11 00:01:16 +01:00 · 2022-12-11 00:01:16 +01:00 · 1ccc7ce6d2
commit 1ccc7ce6d2
parent 47f0dd5b3f
16 changed files with 937 additions and 15 deletions
--- a/cmd/soju/main.go
+++ b/cmd/soju/main.go
@ -92,6 +92,7 @@ func loadConfig() (*config.Server, *soju.Config, error) {
 	cfg := &soju.Config{
 		Hostname:                  raw.Hostname,
 		Title:                     raw.Title,
+		LogDriver:                 raw.MsgStore.Driver,
 		LogPath:                   raw.MsgStore.Source,
 		HTTPOrigins:               raw.HTTPOrigins,
 		AcceptProxyIPs:            raw.AcceptProxyIPs,
--- a/config/config.go
+++ b/config/config.go
@ -150,8 +150,7 @@ func parse(cfg scfg.Block) (*Server, error) {
 				return nil, err
 			}
 			switch srv.MsgStore.Driver {
-			case "memory":
-				srv.MsgStore.Source = ""
+			case "memory", "db":
 			case "fs":
 				if err := d.ParseParams(nil, &srv.MsgStore.Source); err != nil {
 					return nil, err
--- a/contrib/migrate-logs/main.go
+++ b/contrib/migrate-logs/main.go
@ -0,0 +1,148 @@
+package main
+
+import (
+	"bufio"
+	"context"
+	"flag"
+	"fmt"
+	"log"
+	"os"
+	"path/filepath"
+	"sort"
+	"strings"
+	"time"
+
+	"git.sr.ht/~emersion/soju/database"
+	"git.sr.ht/~emersion/soju/msgstore"
+)
+
+const usage = `usage: migrate-logs <source logs> <destination database>
+
+Migrates existing Soju logs stored on disk to a Soju database. Database is specified
+in the format of "driver:source" where driver is sqlite3 or postgres and source
+is the string that would be in the Soju config file.
+
+Options:
+
+  -help               Show this help message
+`
+
+var logRoot string
+
+func init() {
+	flag.Usage = func() {
+		fmt.Fprint(flag.CommandLine.Output(), usage)
+	}
+}
+
+func migrateNetwork(ctx context.Context, db database.Database, user *database.User, network *database.Network) error {
+	log.Printf("Migrating logs for network: %s\n", network.Name)
+
+	rootPath := filepath.Join(logRoot, msgstore.EscapeFilename(user.Username), msgstore.EscapeFilename(network.GetName()))
+	root, err := os.Open(rootPath)
+	if os.IsNotExist(err) {
+		return nil
+	}
+	if err != nil {
+		return fmt.Errorf("unable to open network folder: %s", rootPath)
+	}
+
+	// The returned targets are escaped, and there is no way to un-escape
+	// TODO: switch to ReadDir (Go 1.16+)
+	targets, err := root.Readdirnames(0)
+	root.Close()
+	if err != nil {
+		return fmt.Errorf("unable to read network folder: %s", rootPath)
+	}
+
+	for _, target := range targets {
+		log.Printf("Migrating logs for target: %s\n", target)
+
+		// target is already escaped here
+		targetPath := filepath.Join(rootPath, target)
+		targetDir, err := os.Open(targetPath)
+		if err != nil {
+			return fmt.Errorf("unable to open target folder: %s", targetPath)
+		}
+
+		entryNames, err := targetDir.Readdirnames(0)
+		targetDir.Close()
+		if err != nil {
+			return fmt.Errorf("unable to read target folder: %s", targetPath)
+		}
+		sort.Strings(entryNames)
+
+		for _, entryName := range entryNames {
+			entryPath := filepath.Join(targetPath, entryName)
+
+			var year, month, day int
+			_, err := fmt.Sscanf(entryName, "%04d-%02d-%02d.log", &year, &month, &day)
+			if err != nil {
+				return fmt.Errorf("invalid entry name: %s", entryName)
+			}
+			ref := time.Date(year, time.Month(month), day, 0, 0, 0, 0, time.UTC)
+
+			entry, err := os.Open(entryPath)
+			if err != nil {
+				return fmt.Errorf("unable to open entry: %s", entryPath)
+			}
+			sc := bufio.NewScanner(entry)
+			for sc.Scan() {
+				msg, _, err := msgstore.FSParseMessage(sc.Text(), user, network, target, ref, true)
+				if err != nil {
+					return fmt.Errorf("unable to parse entry: %s: %s", entryPath, sc.Text())
+				} else if msg == nil {
+					continue
+				}
+				_, err = db.StoreMessage(ctx, network.ID, target, msg)
+				if err != nil {
+					return fmt.Errorf("unable to store message: %s: %s: %v", entryPath, sc.Text(), err)
+				}
+			}
+			if sc.Err() != nil {
+				return fmt.Errorf("unable to parse entry: %s: %v", entryPath, sc.Err())
+			}
+			entry.Close()
+		}
+	}
+	return nil
+}
+
+func main() {
+	flag.Parse()
+
+	ctx := context.Background()
+
+	logRoot = flag.Arg(0)
+	dbParams := strings.Split(flag.Arg(1), ":")
+
+	if len(dbParams) != 2 {
+		log.Fatalf("database not properly specified: %s", flag.Arg(1))
+	}
+
+	db, err := database.Open(dbParams[0], dbParams[1])
+	if err != nil {
+		log.Fatalf("failed to open database: %v", err)
+	}
+	defer db.Close()
+
+	users, err := db.ListUsers(ctx)
+	if err != nil {
+		log.Fatalf("unable to get users: %v", err)
+	}
+
+	for _, user := range users {
+		log.Printf("Migrating logs for user: %s\n", user.Username)
+
+		networks, err := db.ListNetworks(ctx, user.ID)
+		if err != nil {
+			log.Fatalf("unable to get networks for user: #%d %s", user.ID, user.Username)
+		}
+
+		for _, network := range networks {
+			if err := migrateNetwork(ctx, db, &user, &network); err != nil {
+				log.Fatalf("migrating %v: %v", network.Name, err)
+			}
+		}
+	}
+}
--- a/database/database.go
+++ b/database/database.go
@ -10,8 +10,25 @@ import (

 	"github.com/prometheus/client_golang/prometheus"
 	"golang.org/x/crypto/bcrypt"
+	"gopkg.in/irc.v4"
 )

+type MessageTarget struct {
+	Name          string
+	LatestMessage time.Time
+}
+
+type MessageOptions struct {
+	AfterID    int64
+	AfterTime  time.Time
+	BeforeTime time.Time
+	Limit      int
+	Events     bool
+	Sender     string
+	Text       string
+	TakeLast   bool
+}
+
 type Database interface {
 	Close() error
 	Stats(ctx context.Context) (*DatabaseStats, error)
@ -41,6 +58,11 @@ type Database interface {
 	ListWebPushSubscriptions(ctx context.Context, userID, networkID int64) ([]WebPushSubscription, error)
 	StoreWebPushSubscription(ctx context.Context, userID, networkID int64, sub *WebPushSubscription) error
 	DeleteWebPushSubscription(ctx context.Context, id int64) error
+
+	GetMessageLastID(ctx context.Context, networkID int64, name string) (int64, error)
+	StoreMessage(ctx context.Context, networkID int64, name string, msg *irc.Message) (int64, error)
+	ListMessageLastPerTarget(ctx context.Context, networkID int64, options *MessageOptions) ([]MessageTarget, error)
+	ListMessages(ctx context.Context, networkID int64, name string, options *MessageOptions) ([]*irc.Message, error)
 }

 type MetricsCollectorDatabase interface {
--- a/database/postgres.go
+++ b/database/postgres.go
@ -9,9 +9,11 @@ import (
 	"strings"
 	"time"

+	"git.sr.ht/~emersion/soju/xirc"
 	_ "github.com/lib/pq"
 	"github.com/prometheus/client_golang/prometheus"
 	promcollectors "github.com/prometheus/client_golang/prometheus/collectors"
+	"gopkg.in/irc.v4"
 )

 const postgresQueryTimeout = 5 * time.Second
@ -112,6 +114,30 @@ CREATE TABLE "WebPushSubscription" (
 	key_p256dh TEXT,
 	UNIQUE(network, endpoint)
 );
+
+CREATE TABLE "MessageTarget" (
+	id SERIAL PRIMARY KEY,
+	network INTEGER NOT NULL REFERENCES "Network"(id) ON DELETE CASCADE,
+	target TEXT NOT NULL,
+	UNIQUE(network, target)
+);
+
+CREATE TEXT SEARCH DICTIONARY "search_simple_dictionary" (
+    TEMPLATE = pg_catalog.simple
+);
+CREATE TEXT SEARCH CONFIGURATION "search_simple" ( COPY = pg_catalog.simple );
+ALTER TEXT SEARCH CONFIGURATION "search_simple" ALTER MAPPING FOR asciiword, asciihword, hword_asciipart, hword, hword_part, word WITH "search_simple_dictionary";
+CREATE TABLE "Message" (
+	id SERIAL PRIMARY KEY,
+	target INTEGER NOT NULL REFERENCES "MessageTarget"(id) ON DELETE CASCADE,
+	raw TEXT NOT NULL,
+	time TIMESTAMP WITH TIME ZONE NOT NULL,
+	sender TEXT NOT NULL,
+	text TEXT,
+	text_search tsvector GENERATED ALWAYS AS (to_tsvector('search_simple', text)) STORED
+);
+CREATE INDEX "MessageIndex" ON "Message" (target, time);
+CREATE INDEX "MessageSearchIndex" ON "Message" USING GIN (text_search);
 `

 var postgresMigrations = []string{
@ -173,6 +199,30 @@ var postgresMigrations = []string{
 	`ALTER TABLE "User" ADD COLUMN created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT now()`,
 	`ALTER TABLE "User" ADD COLUMN enabled BOOLEAN NOT NULL DEFAULT TRUE`,
 	`ALTER TABLE "User" ADD COLUMN downstream_interacted_at TIMESTAMP WITH TIME ZONE`,
+	`
+		CREATE TABLE "MessageTarget" (
+			id SERIAL PRIMARY KEY,
+			network INTEGER NOT NULL REFERENCES "Network"(id) ON DELETE CASCADE,
+			target TEXT NOT NULL,
+			UNIQUE(network, target)
+		);
+		CREATE TEXT SEARCH DICTIONARY "search_simple_dictionary" (
+			TEMPLATE = pg_catalog.simple
+		);
+		CREATE TEXT SEARCH CONFIGURATION "search_simple" ( COPY = pg_catalog.simple );
+		ALTER TEXT SEARCH CONFIGURATION "search_simple" ALTER MAPPING FOR asciiword, asciihword, hword_asciipart, hword, hword_part, word WITH "search_simple_dictionary";
+		CREATE TABLE "Message" (
+			id SERIAL PRIMARY KEY,
+			target INTEGER NOT NULL REFERENCES "MessageTarget"(id) ON DELETE CASCADE,
+			raw TEXT NOT NULL,
+			time TIMESTAMP WITH TIME ZONE NOT NULL,
+			sender TEXT NOT NULL,
+			text TEXT,
+			text_search tsvector GENERATED ALWAYS AS (to_tsvector('search_simple', text)) STORED
+		);
+		CREATE INDEX "MessageIndex" ON "Message" (target, time);
+		CREATE INDEX "MessageSearchIndex" ON "Message" USING GIN (text_search);
+	`,
 }

 type PostgresDB struct {
@ -847,6 +897,229 @@ func (db *PostgresDB) DeleteWebPushSubscription(ctx context.Context, id int64) e
 	return err
 }

+func (db *PostgresDB) GetMessageLastID(ctx context.Context, networkID int64, name string) (int64, error) {
+	ctx, cancel := context.WithTimeout(ctx, postgresQueryTimeout)
+	defer cancel()
+
+	var msgID int64
+	row := db.db.QueryRowContext(ctx, `
+		SELECT m.id FROM "Message" AS m, "MessageTarget" as t
+		WHERE t.network = $1 AND t.target = $2 AND m.target = t.id
+		ORDER BY m.time DESC LIMIT 1`,
+		networkID,
+		name,
+	)
+	if err := row.Scan(&msgID); err != nil {
+		if err == sql.ErrNoRows {
+			return 0, nil
+		}
+		return 0, err
+	}
+	return msgID, nil
+}
+
+func (db *PostgresDB) StoreMessage(ctx context.Context, networkID int64, name string, msg *irc.Message) (int64, error) {
+	ctx, cancel := context.WithTimeout(ctx, postgresQueryTimeout)
+	defer cancel()
+
+	var t time.Time
+	if tag, ok := msg.Tags["time"]; ok {
+		var err error
+		t, err = time.Parse(xirc.ServerTimeLayout, tag)
+		if err != nil {
+			return 0, fmt.Errorf("failed to parse message time tag: %v", err)
+		}
+	} else {
+		t = time.Now()
+	}
+
+	var text sql.NullString
+	switch msg.Command {
+	case "PRIVMSG", "NOTICE":
+		if len(msg.Params) > 1 {
+			text.Valid = true
+			text.String = msg.Params[1]
+		}
+	}
+
+	_, err := db.db.ExecContext(ctx, `
+		INSERT INTO "MessageTarget" (network, target)
+		VALUES ($1, $2)
+		ON CONFLICT DO NOTHING`,
+		networkID,
+		name,
+	)
+	if err != nil {
+		return 0, err
+	}
+
+	var id int64
+	err = db.db.QueryRowContext(ctx, `
+		INSERT INTO "Message" (target, raw, time, sender, text)
+		SELECT id, $1, $2, $3, $4
+		FROM "MessageTarget" as t
+		WHERE network = $5 AND target = $6
+		RETURNING id`,
+		msg.String(),
+		t,
+		msg.Name,
+		text,
+		networkID,
+		name,
+	).Scan(&id)
+	if err != nil {
+		return 0, err
+	}
+	return id, nil
+}
+
+func (db *PostgresDB) ListMessageLastPerTarget(ctx context.Context, networkID int64, options *MessageOptions) ([]MessageTarget, error) {
+	ctx, cancel := context.WithTimeout(ctx, postgresQueryTimeout)
+	defer cancel()
+
+	parameters := []interface{}{
+		networkID,
+	}
+	query := `
+		SELECT t.target, MAX(m.time) AS latest
+		FROM "Message" m, "MessageTarget" t
+		WHERE m.target = t.id AND t.network = $1
+	`
+	if !options.Events {
+		query += `AND m.text IS NOT NULL `
+	}
+	query += `
+		GROUP BY t.target
+		HAVING true
+	`
+	if !options.AfterTime.IsZero() {
+		// compares time strings by lexicographical order
+		parameters = append(parameters, options.AfterTime)
+		query += fmt.Sprintf(`AND MAX(m.time) > $%d `, len(parameters))
+	}
+	if !options.BeforeTime.IsZero() {
+		// compares time strings by lexicographical order
+		parameters = append(parameters, options.BeforeTime)
+		query += fmt.Sprintf(`AND MAX(m.time) < $%d `, len(parameters))
+	}
+	if options.TakeLast {
+		query += `ORDER BY latest DESC `
+	} else {
+		query += `ORDER BY latest ASC `
+	}
+	parameters = append(parameters, options.Limit)
+	query += fmt.Sprintf(`LIMIT $%d`, len(parameters))
+
+	rows, err := db.db.QueryContext(ctx, query, parameters...)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var l []MessageTarget
+	for rows.Next() {
+		var mt MessageTarget
+		if err := rows.Scan(&mt.Name, &mt.LatestMessage); err != nil {
+			return nil, err
+		}
+
+		l = append(l, mt)
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+
+	if options.TakeLast {
+		// We ordered by DESC to limit to the last lines.
+		// Reverse the list to order by ASC these last lines.
+		for i, j := 0, len(l)-1; i < j; i, j = i+1, j-1 {
+			l[i], l[j] = l[j], l[i]
+		}
+	}
+
+	return l, nil
+}
+
+func (db *PostgresDB) ListMessages(ctx context.Context, networkID int64, name string, options *MessageOptions) ([]*irc.Message, error) {
+	ctx, cancel := context.WithTimeout(ctx, postgresQueryTimeout)
+	defer cancel()
+
+	parameters := []interface{}{
+		networkID,
+		name,
+	}
+	query := `
+		SELECT m.raw
+		FROM "Message" AS m, "MessageTarget" AS t
+		WHERE m.target = t.id AND t.network = $1 AND t.target = $2 `
+	if options.AfterID > 0 {
+		parameters = append(parameters, options.AfterID)
+		query += fmt.Sprintf(`AND m.id > $%d `, len(parameters))
+	}
+	if !options.AfterTime.IsZero() {
+		// compares time strings by lexicographical order
+		parameters = append(parameters, options.AfterTime)
+		query += fmt.Sprintf(`AND m.time > $%d `, len(parameters))
+	}
+	if !options.BeforeTime.IsZero() {
+		// compares time strings by lexicographical order
+		parameters = append(parameters, options.BeforeTime)
+		query += fmt.Sprintf(`AND m.time < $%d `, len(parameters))
+	}
+	if options.Sender != "" {
+		parameters = append(parameters, options.Sender)
+		query += fmt.Sprintf(`AND m.sender = $%d `, len(parameters))
+	}
+	if options.Text != "" {
+		parameters = append(parameters, options.Text)
+		query += fmt.Sprintf(`AND text_search @@ plainto_tsquery('search_simple', $%d) `, len(parameters))
+	}
+	if !options.Events {
+		query += `AND m.text IS NOT NULL `
+	}
+	if options.TakeLast {
+		query += `ORDER BY m.time DESC `
+	} else {
+		query += `ORDER BY m.time ASC `
+	}
+	parameters = append(parameters, options.Limit)
+	query += fmt.Sprintf(`LIMIT $%d`, len(parameters))
+
+	rows, err := db.db.QueryContext(ctx, query, parameters...)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var l []*irc.Message
+	for rows.Next() {
+		var raw string
+		if err := rows.Scan(&raw); err != nil {
+			return nil, err
+		}
+
+		msg, err := irc.ParseMessage(raw)
+		if err != nil {
+			return nil, err
+		}
+
+		l = append(l, msg)
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+
+	if options.TakeLast {
+		// We ordered by DESC to limit to the last lines.
+		// Reverse the list to order by ASC these last lines.
+		for i, j := 0, len(l)-1; i < j; i, j = i+1, j-1 {
+			l[i], l[j] = l[j], l[i]
+		}
+	}
+
+	return l, nil
+}
+
 var postgresNetworksTotalDesc = prometheus.NewDesc("soju_networks_total", "Number of networks", []string{"hostname"}, nil)

 type postgresMetricsCollector struct {
--- a/database/sqlite.go
+++ b/database/sqlite.go
@ -1,4 +1,5 @@
 //go:build !nosqlite
+// +build !nosqlite

 package database

@ -11,8 +12,10 @@ import (
 	"strings"
 	"time"

+	"git.sr.ht/~emersion/soju/xirc"
 	"github.com/prometheus/client_golang/prometheus"
 	promcollectors "github.com/prometheus/client_golang/prometheus/collectors"
+	"gopkg.in/irc.v4"
 )

 const SqliteEnabled = true
@ -146,6 +149,41 @@ CREATE TABLE WebPushSubscription (
 	FOREIGN KEY(network) REFERENCES Network(id),
 	UNIQUE(network, endpoint)
 );
+
+CREATE TABLE Message (
+	id INTEGER PRIMARY KEY,
+	target INTEGER NOT NULL,
+	raw TEXT NOT NULL,
+	time TEXT NOT NULL,
+	sender TEXT NOT NULL,
+	text TEXT,
+	FOREIGN KEY(target) REFERENCES MessageTarget(id)
+);
+CREATE INDEX MessageIndex ON Message(target, time);
+
+CREATE TABLE MessageTarget (
+	id INTEGER PRIMARY KEY,
+	network INTEGER NOT NULL,
+	target TEXT NOT NULL,
+	FOREIGN KEY(network) REFERENCES Network(id),
+	UNIQUE(network, target)
+);
+
+CREATE VIRTUAL TABLE MessageFTS USING fts5 (
+	text,
+	content=Message,
+	content_rowid=id
+);
+CREATE TRIGGER MessageFTSInsert AFTER INSERT ON Message BEGIN
+	INSERT INTO MessageFTS(rowid, text) VALUES (new.id, new.text);
+END;
+CREATE TRIGGER MessageFTSDelete AFTER DELETE ON Message BEGIN
+	INSERT INTO MessageFTS(MessageFTS, rowid, text) VALUES ('delete', old.id, old.text);
+END;
+CREATE TRIGGER MessageFTSUpdate AFTER UPDATE ON Message BEGIN
+	INSERT INTO MessageFTS(MessageFTS, rowid, text) VALUES ('delete', old.id, old.text);
+	INSERT INTO MessageFTS(rowid, text) VALUES (new.id, new.text);
+END;
 `

 var sqliteMigrations = []string{
@ -293,6 +331,42 @@ var sqliteMigrations = []string{
 	`,
 	"ALTER TABLE User ADD COLUMN enabled INTEGER NOT NULL DEFAULT 1",
 	"ALTER TABLE User ADD COLUMN downstream_interacted_at TEXT;",
+	`
+		CREATE TABLE Message (
+			id INTEGER PRIMARY KEY,
+			target INTEGER NOT NULL,
+			raw TEXT NOT NULL,
+			time TEXT NOT NULL,
+			sender TEXT NOT NULL,
+			text TEXT,
+			FOREIGN KEY(target) REFERENCES MessageTarget(id)
+		);
+		CREATE INDEX MessageIndex ON Message(target, time);
+
+		CREATE TABLE MessageTarget (
+			id INTEGER PRIMARY KEY,
+			network INTEGER NOT NULL,
+			target TEXT NOT NULL,
+			FOREIGN KEY(network) REFERENCES Network(id),
+			UNIQUE(network, target)
+		);
+
+		CREATE VIRTUAL TABLE MessageFTS USING fts5 (
+			text,
+			content=Message,
+			content_rowid=id
+		);
+		CREATE TRIGGER MessageFTSInsert AFTER INSERT ON Message BEGIN
+			INSERT INTO MessageFTS(rowid, text) VALUES (new.id, new.text);
+		END;
+		CREATE TRIGGER MessageFTSDelete AFTER DELETE ON Message BEGIN
+			INSERT INTO MessageFTS(MessageFTS, rowid, text) VALUES ('delete', old.id, old.text);
+		END;
+		CREATE TRIGGER MessageFTSUpdate AFTER UPDATE ON Message BEGIN
+			INSERT INTO MessageFTS(MessageFTS, rowid, text) VALUES ('delete', old.id, old.text);
+			INSERT INTO MessageFTS(rowid, text) VALUES (new.id, new.text);
+		END;
+	`,
 }

 type SqliteDB struct {
@ -697,6 +771,16 @@ func (db *SqliteDB) DeleteNetwork(ctx context.Context, id int64) error {
 	}
 	defer tx.Rollback()

+	_, err = tx.ExecContext(ctx, "DELETE FROM Message WHERE target IN (SELECT id FROM MessageTarget WHERE network = ?)", id)
+	if err != nil {
+		return err
+	}
+
+	_, err = tx.ExecContext(ctx, "DELETE FROM MessageTarget WHERE network = ?", id)
+	if err != nil {
+		return err
+	}
+
 	_, err = tx.ExecContext(ctx, "DELETE FROM WebPushSubscription WHERE network = ?", id)
 	if err != nil {
 		return err
@ -1054,3 +1138,232 @@ func (db *SqliteDB) DeleteWebPushSubscription(ctx context.Context, id int64) err
 	_, err := db.db.ExecContext(ctx, "DELETE FROM WebPushSubscription WHERE id = ?", id)
 	return err
 }
+
+func (db *SqliteDB) GetMessageLastID(ctx context.Context, networkID int64, name string) (int64, error) {
+	ctx, cancel := context.WithTimeout(ctx, sqliteQueryTimeout)
+	defer cancel()
+
+	var msgID int64
+	row := db.db.QueryRowContext(ctx, `
+		SELECT m.id FROM Message AS m, MessageTarget AS t
+		WHERE t.network = :network AND t.target = :target AND m.target = t.id
+		ORDER BY m.time DESC LIMIT 1`,
+		sql.Named("network", networkID),
+		sql.Named("target", name),
+	)
+	if err := row.Scan(&msgID); err != nil {
+		if err == sql.ErrNoRows {
+			return 0, nil
+		}
+		return 0, err
+	}
+	return msgID, nil
+}
+
+func (db *SqliteDB) StoreMessage(ctx context.Context, networkID int64, name string, msg *irc.Message) (int64, error) {
+	ctx, cancel := context.WithTimeout(ctx, sqliteQueryTimeout)
+	defer cancel()
+
+	var t time.Time
+	if tag, ok := msg.Tags["time"]; ok {
+		var err error
+		t, err = time.Parse(xirc.ServerTimeLayout, tag)
+		if err != nil {
+			return 0, fmt.Errorf("failed to parse message time tag: %v", err)
+		}
+	} else {
+		t = time.Now()
+	}
+
+	var text sql.NullString
+	switch msg.Command {
+	case "PRIVMSG", "NOTICE":
+		if len(msg.Params) > 1 {
+			text.Valid = true
+			text.String = msg.Params[1]
+		}
+	}
+
+	res, err := db.db.ExecContext(ctx, `
+		INSERT INTO MessageTarget(network, target)
+		VALUES (:network, :target)
+		ON CONFLICT DO NOTHING`,
+		sql.Named("network", networkID),
+		sql.Named("target", name),
+	)
+	if err != nil {
+		return 0, err
+	}
+
+	res, err = db.db.ExecContext(ctx, `
+		INSERT INTO Message(target, raw, time, sender, text)
+		SELECT id, :raw, :time, :sender, :text
+		FROM MessageTarget as t
+		WHERE network = :network AND target = :target`,
+		sql.Named("network", networkID),
+		sql.Named("target", name),
+		sql.Named("raw", msg.String()),
+		sql.Named("time", sqliteTime{t}),
+		sql.Named("sender", msg.Name),
+		sql.Named("text", text),
+	)
+	if err != nil {
+		return 0, err
+	}
+	id, err := res.LastInsertId()
+	if err != nil {
+		return 0, err
+	}
+	return id, nil
+}
+
+func (db *SqliteDB) ListMessageLastPerTarget(ctx context.Context, networkID int64, options *MessageOptions) ([]MessageTarget, error) {
+	ctx, cancel := context.WithTimeout(ctx, sqliteQueryTimeout)
+	defer cancel()
+
+	innerQuery := `
+		SELECT time
+		FROM Message
+		WHERE target = MessageTarget.id `
+	if !options.Events {
+		innerQuery += `AND text IS NOT NULL `
+	}
+	innerQuery += `
+		ORDER BY time DESC
+		LIMIT 1
+	`
+
+	query := `
+		SELECT target, (` + innerQuery + `) latest
+		FROM MessageTarget
+		WHERE network = :network `
+	if !options.AfterTime.IsZero() {
+		// compares time strings by lexicographical order
+		query += `AND latest > :after `
+	}
+	if !options.BeforeTime.IsZero() {
+		// compares time strings by lexicographical order
+		query += `AND latest < :before `
+	}
+	if options.TakeLast {
+		query += `ORDER BY latest DESC `
+	} else {
+		query += `ORDER BY latest ASC `
+	}
+	query += `LIMIT :limit`
+
+	rows, err := db.db.QueryContext(ctx, query,
+		sql.Named("network", networkID),
+		sql.Named("after", sqliteTime{options.AfterTime}),
+		sql.Named("before", sqliteTime{options.BeforeTime}),
+		sql.Named("limit", options.Limit),
+	)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var l []MessageTarget
+	for rows.Next() {
+		var mt MessageTarget
+		var ts sqliteTime
+		if err := rows.Scan(&mt.Name, &ts); err != nil {
+			return nil, err
+		}
+
+		mt.LatestMessage = ts.Time
+		l = append(l, mt)
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+
+	if options.TakeLast {
+		// We ordered by DESC to limit to the last lines.
+		// Reverse the list to order by ASC these last lines.
+		for i, j := 0, len(l)-1; i < j; i, j = i+1, j-1 {
+			l[i], l[j] = l[j], l[i]
+		}
+	}
+
+	return l, nil
+}
+
+func (db *SqliteDB) ListMessages(ctx context.Context, networkID int64, name string, options *MessageOptions) ([]*irc.Message, error) {
+	ctx, cancel := context.WithTimeout(ctx, sqliteQueryTimeout)
+	defer cancel()
+
+	query := `
+		SELECT m.raw
+		FROM Message AS m, MessageTarget AS t
+		WHERE m.target = t.id AND t.network = :network AND t.target = :target `
+	if options.AfterID > 0 {
+		query += `AND m.id > :afterID `
+	}
+	if !options.AfterTime.IsZero() {
+		// compares time strings by lexicographical order
+		query += `AND m.time > :after `
+	}
+	if !options.BeforeTime.IsZero() {
+		// compares time strings by lexicographical order
+		query += `AND m.time < :before `
+	}
+	if options.Sender != "" {
+		query += `AND m.sender = :sender `
+	}
+	if options.Text != "" {
+		query += `AND m.id IN (SELECT ROWID FROM MessageFTS WHERE MessageFTS MATCH :text) `
+	}
+	if !options.Events {
+		query += `AND m.text IS NOT NULL `
+	}
+	if options.TakeLast {
+		query += `ORDER BY m.time DESC `
+	} else {
+		query += `ORDER BY m.time ASC `
+	}
+	query += `LIMIT :limit`
+
+	rows, err := db.db.QueryContext(ctx, query,
+		sql.Named("network", networkID),
+		sql.Named("target", name),
+		sql.Named("afterID", options.AfterID),
+		sql.Named("after", sqliteTime{options.AfterTime}),
+		sql.Named("before", sqliteTime{options.BeforeTime}),
+		sql.Named("sender", options.Sender),
+		sql.Named("text", options.Text),
+		sql.Named("limit", options.Limit),
+	)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var l []*irc.Message
+	for rows.Next() {
+		var raw string
+		if err := rows.Scan(&raw); err != nil {
+			return nil, err
+		}
+
+		msg, err := irc.ParseMessage(raw)
+		if err != nil {
+			return nil, err
+		}
+
+		l = append(l, msg)
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+
+	if options.TakeLast {
+		// We ordered by DESC to limit to the last lines.
+		// Reverse the list to order by ASC these last lines.
+		for i, j := 0, len(l)-1; i < j; i, j = i+1, j-1 {
+			l[i], l[j] = l[j], l[i]
+		}
+	}
+
+	return l, nil
+}
--- a/database/sqlite_mattn.go
+++ b/database/sqlite_mattn.go
@ -3,6 +3,7 @@
 package database

 import (
+	_ "git.sr.ht/~emersion/go-sqlite3-fts5"
 	_ "github.com/mattn/go-sqlite3"
 )

--- a/doc/soju.1.scd
+++ b/doc/soju.1.scd
@ -137,6 +137,7 @@ The following directives are supported:
 	- _memory_ stores messages in memory.
 	- _fs_ stores messages on disk, in the same format as ZNC. _source_ is
 	  required and is the root directory path for the database.
+	- _db_ stores messages in the database.

 	(_log_ is a deprecated alias for this directive.)

--- a/downstream.go
+++ b/downstream.go
@ -401,7 +401,8 @@ func newDownstreamConn(srv *Server, ic ircConn, id uint64) *downstreamConn {
 	// TODO: this is racy, we should only enable chathistory after
 	// authentication and then check that user.msgStore implements
 	// chatHistoryMessageStore
-	if srv.Config().LogPath != "" {
+	switch srv.Config().LogDriver {
+	case "fs", "db":
 		dc.caps.Available["draft/chathistory"] = ""
 		dc.caps.Available["soju.im/search"] = ""
 	}
--- a/go.mod
+++ b/go.mod
@ -4,6 +4,7 @@ go 1.15

 require (
 	git.sr.ht/~emersion/go-scfg v0.0.0-20211215104734-c2c7a15d6c99
+	git.sr.ht/~emersion/go-sqlite3-fts5 v0.0.0-20230217131031-f2c8767594fc
 	git.sr.ht/~sircmpwn/go-bare v0.0.0-20210406120253-ab86bc2846d9
 	github.com/SherClockHolmes/webpush-go v1.2.0
 	github.com/emersion/go-sasl v0.0.0-20220912192320-0145f2c60ead
--- a/go.sum
+++ b/go.sum
@ -33,6 +33,8 @@ cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 git.sr.ht/~emersion/go-scfg v0.0.0-20211215104734-c2c7a15d6c99 h1:1s8n5uisqkR+BzPgaum6xxIjKmzGrTykJdh+Y3f5Xao=
 git.sr.ht/~emersion/go-scfg v0.0.0-20211215104734-c2c7a15d6c99/go.mod h1:t+Ww6SR24yYnXzEWiNlOY0AFo5E9B73X++10lrSpp4U=
+git.sr.ht/~emersion/go-sqlite3-fts5 v0.0.0-20230217131031-f2c8767594fc h1:+y3OijpLl4rgbFsqMBmYUTCsGCkxQUWpWaqfS8j9Ygc=
+git.sr.ht/~emersion/go-sqlite3-fts5 v0.0.0-20230217131031-f2c8767594fc/go.mod h1:PCl1xjl7iC6x35TKKubKRyo/3TT0dGI66jyNI6vmYnU=
 git.sr.ht/~sircmpwn/getopt v0.0.0-20191230200459-23622cc906b3/go.mod h1:wMEGFFFNuPos7vHmWXfszqImLppbc0wEhh6JBfJIUgw=
 git.sr.ht/~sircmpwn/go-bare v0.0.0-20210406120253-ab86bc2846d9 h1:Ahny8Ud1LjVMMAlt8utUFKhhxJtwBAualvsbc/Sk7cE=
 git.sr.ht/~sircmpwn/go-bare v0.0.0-20210406120253-ab86bc2846d9/go.mod h1:BVJwbDfVjCjoFiKrhkei6NdGcZYpkDkdyCdg1ukytRA=
--- a/msgstore/db.go
+++ b/msgstore/db.go
@ -0,0 +1,151 @@
+package msgstore
+
+import (
+	"context"
+	"time"
+
+	"git.sr.ht/~emersion/soju/database"
+	"git.sr.ht/~sircmpwn/go-bare"
+	"gopkg.in/irc.v4"
+)
+
+type dbMsgID struct {
+	ID bare.Uint
+}
+
+func (dbMsgID) msgIDType() msgIDType {
+	return msgIDDB
+}
+
+func parseDBMsgID(s string) (msgID int64, err error) {
+	var id dbMsgID
+	_, _, err = ParseMsgID(s, &id)
+	if err != nil {
+		return 0, err
+	}
+	return int64(id.ID), nil
+}
+
+func formatDBMsgID(netID int64, target string, msgID int64) string {
+	id := dbMsgID{bare.Uint(msgID)}
+	return formatMsgID(netID, target, &id)
+}
+
+// dbMessageStore is a persistent store for IRC messages, that
+// stores messages in the soju database.
+type dbMessageStore struct {
+	db database.Database
+}
+
+var (
+	_ Store            = (*dbMessageStore)(nil)
+	_ ChatHistoryStore = (*dbMessageStore)(nil)
+	_ SearchStore      = (*dbMessageStore)(nil)
+)
+
+func NewDBStore(db database.Database) *dbMessageStore {
+	return &dbMessageStore{
+		db: db,
+	}
+}
+
+func (ms *dbMessageStore) Close() error {
+	return nil
+}
+
+func (ms *dbMessageStore) LastMsgID(network *database.Network, entity string, t time.Time) (string, error) {
+	// TODO: what should we do with t?
+
+	id, err := ms.db.GetMessageLastID(context.TODO(), network.ID, entity)
+	if err != nil {
+		return "", err
+	}
+	return formatDBMsgID(network.ID, entity, id), nil
+}
+
+func (ms *dbMessageStore) LoadLatestID(ctx context.Context, id string, options *LoadMessageOptions) ([]*irc.Message, error) {
+	msgID, err := parseDBMsgID(id)
+	if err != nil {
+		return nil, err
+	}
+
+	l, err := ms.db.ListMessages(ctx, options.Network.ID, options.Entity, &database.MessageOptions{
+		AfterID:  msgID,
+		Limit:    options.Limit,
+		TakeLast: true,
+	})
+	if err != nil {
+		return nil, err
+	}
+	return l, nil
+}
+
+func (ms *dbMessageStore) Append(network *database.Network, entity string, msg *irc.Message) (string, error) {
+	id, err := ms.db.StoreMessage(context.TODO(), network.ID, entity, msg)
+	if err != nil {
+		return "", err
+	}
+	return formatDBMsgID(network.ID, entity, id), nil
+}
+
+func (ms *dbMessageStore) ListTargets(ctx context.Context, network *database.Network, start, end time.Time, limit int, events bool) ([]ChatHistoryTarget, error) {
+	l, err := ms.db.ListMessageLastPerTarget(ctx, network.ID, &database.MessageOptions{
+		AfterTime:  start,
+		BeforeTime: end,
+		Limit:      limit,
+		Events:     events,
+	})
+	if err != nil {
+		return nil, err
+	}
+	targets := make([]ChatHistoryTarget, len(l))
+	for i, v := range l {
+		targets[i] = ChatHistoryTarget{
+			Name:          v.Name,
+			LatestMessage: v.LatestMessage,
+		}
+	}
+	return targets, nil
+}
+
+func (ms *dbMessageStore) LoadBeforeTime(ctx context.Context, start, end time.Time, options *LoadMessageOptions) ([]*irc.Message, error) {
+	l, err := ms.db.ListMessages(ctx, options.Network.ID, options.Entity, &database.MessageOptions{
+		AfterTime:  end,
+		BeforeTime: start,
+		Limit:      options.Limit,
+		Events:     options.Events,
+		TakeLast:   true,
+	})
+	if err != nil {
+		return nil, err
+	}
+	return l, nil
+}
+
+func (ms *dbMessageStore) LoadAfterTime(ctx context.Context, start, end time.Time, options *LoadMessageOptions) ([]*irc.Message, error) {
+	l, err := ms.db.ListMessages(ctx, options.Network.ID, options.Entity, &database.MessageOptions{
+		AfterTime:  start,
+		BeforeTime: end,
+		Limit:      options.Limit,
+		Events:     options.Events,
+	})
+	if err != nil {
+		return nil, err
+	}
+	return l, nil
+}
+
+func (ms *dbMessageStore) Search(ctx context.Context, network *database.Network, options *SearchMessageOptions) ([]*irc.Message, error) {
+	l, err := ms.db.ListMessages(ctx, network.ID, options.In, &database.MessageOptions{
+		AfterTime:  options.Start,
+		BeforeTime: options.End,
+		Limit:      options.Limit,
+		Sender:     options.From,
+		Text:       options.Text,
+		TakeLast:   true,
+	})
+	if err != nil {
+		return nil, err
+	}
+	return l, nil
+}
--- a/msgstore/fs.go
+++ b/msgstore/fs.go
@ -23,7 +23,7 @@ const (
 	fsMessageStoreMaxTries = 100
 )

-func escapeFilename(unsafe string) (safe string) {
+func EscapeFilename(unsafe string) (safe string) {
 	if unsafe == "." {
 		return "-"
 	} else if unsafe == ".." {
@ -103,7 +103,7 @@ func IsFSStore(store Store) bool {

 func NewFSStore(root string, user *database.User) *fsMessageStore {
 	return &fsMessageStore{
-		root:  filepath.Join(root, escapeFilename(user.Username)),
+		root:  filepath.Join(root, EscapeFilename(user.Username)),
 		user:  user,
 		files: make(map[string]*fsMessageStoreFile),
 	}
@ -112,7 +112,7 @@ func NewFSStore(root string, user *database.User) *fsMessageStore {
 func (ms *fsMessageStore) logPath(network *database.Network, entity string, t time.Time) string {
 	year, month, day := t.Date()
 	filename := fmt.Sprintf("%04d-%02d-%02d.log", year, month, day)
-	return filepath.Join(ms.root, escapeFilename(network.GetName()), escapeFilename(entity), filename)
+	return filepath.Join(ms.root, EscapeFilename(network.GetName()), EscapeFilename(entity), filename)
 }

 // nextMsgID queries the message ID for the next message to be written to f.
@ -265,6 +265,10 @@ func formatMessage(msg *irc.Message) string {
 }

 func (ms *fsMessageStore) parseMessage(line string, network *database.Network, entity string, ref time.Time, events bool) (*irc.Message, time.Time, error) {
+	return FSParseMessage(line, ms.user, network, entity, ref, events)
+}
+
+func FSParseMessage(line string, user *database.User, network *database.Network, entity string, ref time.Time, events bool) (*irc.Message, time.Time, error) {
 	var hour, minute, second int
 	_, err := fmt.Sscanf(line, "[%02d:%02d:%02d] ", &hour, &minute, &second)
 	if err != nil {
@ -391,7 +395,7 @@ func (ms *fsMessageStore) parseMessage(line string, network *database.Network, e
 			// our nickname in the logs, so grab it from the network settings.
 			// Not very accurate since this may not match our nick at the time
 			// the message was received, but we can't do a lot better.
-			entity = database.GetNick(ms.user, network)
+			entity = database.GetNick(user, network)
 		}
 		params = []string{entity, text}
 	}
@ -634,7 +638,7 @@ func (ms *fsMessageStore) LoadLatestID(ctx context.Context, id string, options *
 func (ms *fsMessageStore) ListTargets(ctx context.Context, network *database.Network, start, end time.Time, limit int, events bool) ([]ChatHistoryTarget, error) {
 	start = start.In(time.Local)
 	end = end.In(time.Local)
-	rootPath := filepath.Join(ms.root, escapeFilename(network.GetName()))
+	rootPath := filepath.Join(ms.root, EscapeFilename(network.GetName()))
 	root, err := os.Open(rootPath)
 	if os.IsNotExist(err) {
 		return nil, nil
@ -713,7 +717,7 @@ func (ms *fsMessageStore) ListTargets(ctx context.Context, network *database.Net
 func (ms *fsMessageStore) Search(ctx context.Context, network *database.Network, opts *SearchMessageOptions) ([]*irc.Message, error) {
 	text := strings.ToLower(opts.Text)
 	selector := func(m *irc.Message) bool {
-		if opts.From != "" && m.User != opts.From {
+		if opts.From != "" && m.Name != opts.From {
 			return false
 		}
 		if text != "" && !strings.Contains(strings.ToLower(m.Params[1]), text) {
@ -734,8 +738,8 @@ func (ms *fsMessageStore) Search(ctx context.Context, network *database.Network,
 }

 func (ms *fsMessageStore) RenameNetwork(oldNet, newNet *database.Network) error {
-	oldDir := filepath.Join(ms.root, escapeFilename(oldNet.GetName()))
-	newDir := filepath.Join(ms.root, escapeFilename(newNet.GetName()))
+	oldDir := filepath.Join(ms.root, EscapeFilename(oldNet.GetName()))
+	newDir := filepath.Join(ms.root, EscapeFilename(newNet.GetName()))
 	// Avoid loosing data by overwriting an existing directory
 	if _, err := os.Stat(newDir); err == nil {
 		return fmt.Errorf("destination %q already exists", newDir)
--- a/msgstore/msgstore.go
+++ b/msgstore/msgstore.go
@ -52,7 +52,7 @@ type ChatHistoryStore interface {
 	// end is before start.
 	// If events is false, only PRIVMSG/NOTICE messages are considered.
 	LoadBeforeTime(ctx context.Context, start, end time.Time, options *LoadMessageOptions) ([]*irc.Message, error)
-	// LoadBeforeTime loads up to limit messages after start up to end. The
+	// LoadAfterTime loads up to limit messages after start up to end. The
 	// returned messages must be between and excluding the provided bounds.
 	// end is after start.
 	// If events is false, only PRIVMSG/NOTICE messages are considered.
@ -90,6 +90,7 @@ const (
 	msgIDNone msgIDType = iota
 	msgIDMemory
 	msgIDFS
+	msgIDDB
 )

 const msgIDVersion uint = 0
--- a/server.go
+++ b/server.go
@ -138,6 +138,7 @@ func (ln *retryListener) Accept() (net.Conn, error) {
 type Config struct {
 	Hostname                  string
 	Title                     string
+	LogDriver                 string
 	LogPath                   string
 	HTTPOrigins               []string
 	AcceptProxyIPs            config.IPSet
--- a/user.go
+++ b/user.go
@ -516,9 +516,12 @@ func newUser(srv *Server, record *database.User) *user {
 	logger := &prefixLogger{srv.Logger, fmt.Sprintf("user %q: ", record.Username)}

 	var msgStore msgstore.Store
-	if logPath := srv.Config().LogPath; logPath != "" {
-		msgStore = msgstore.NewFSStore(logPath, record)
-	} else {
+	switch srv.Config().LogDriver {
+	case "fs":
+		msgStore = msgstore.NewFSStore(srv.Config().LogPath, record)
+	case "db":
+		msgStore = msgstore.NewDBStore(srv.db)
+	case "memory":
 		msgStore = msgstore.NewMemoryStore()
 	}