Optimize access to the sqlite database

.github/workflows/build.yaml

@@ -19,7 +19,7 @@ jobs:
           git diff --exit-code
       - name: Test
         run: |
-          nix develop -c go test -tags sqlite_foreign_keys -v ./...
+          nix develop -c go test -v ./...
       - name: Build
         run: |
           nix build --print-build-logs

cmd/toxstatus/cmd/root.go

@@ -2,7 +2,6 @@ package cmd
 
 import (
 	"context"
-	"database/sql"
 	"errors"
 	"fmt"
 	"log/slog"
@@ -38,6 +37,7 @@ var (
 		PprofAddr         string
 		ToxUDPAddr        string
 		DB                string
+		DBCacheSize       int
 		LogLevel          string
 		Workers           int
 	}{}
@@ -49,7 +49,8 @@ func init() {
 	Root.Flags().DurationVar(&rootFlags.HTTPClientTimeout, "http-client-timeout", 10*time.Second, "the http client timeout for requests to nodes.tox.chat")
 	Root.Flags().StringVar(&rootFlags.PprofAddr, "pprof-addr", "", "the network address to listen of for the pprof HTTP server")
 	Root.Flags().StringVar(&rootFlags.ToxUDPAddr, "tox-udp-addr", ":33450", "the UDP network address to listen on for Tox")
-	Root.Flags().StringVar(&rootFlags.DB, "db", "", "the sqlite database to use")
+	Root.Flags().StringVar(&rootFlags.DB, "db", "", "the sqlite database file to use")
+	Root.Flags().IntVar(&rootFlags.DBCacheSize, "db-cache-size", 100000, "the sqlite cache size to use (in KB)")
 	Root.Flags().StringVar(&rootFlags.LogLevel, "log-level", "info", "the log level to use")
 	Root.Flags().IntVar(&rootFlags.Workers, "workers", min(maxDefaultWorkers, runtime.NumCPU()), "the amount of workers to use")
 	Root.MarkFlagRequired("db")
@@ -71,17 +72,16 @@ func startRoot(cmd *cobra.Command, args []string) {
 		NoColor: !isatty.IsTerminal(os.Stderr.Fd()),
 	}))
 
-	dbConn, err := sql.Open("sqlite3", rootFlags.DB)
+	readConn, writeConn, err := db.OpenReadWrite(ctx, rootFlags.DB, db.OpenOptions{
+		CacheSize: rootFlags.DBCacheSize,
+	})
 	if err != nil {
 		logErrorAndExit(logger, "Unable to open db", slog.Any("err", err))
-		return
-	}
-	defer dbConn.Close()
-
-	if _, err := dbConn.ExecContext(ctx, db.Schema); err != nil {
-		logErrorAndExit(logger, "Unable to initialize db", slog.Any("err", err))
-		return
 	}
+	defer func() {
+		readConn.Close()
+		writeConn.Close()
+	}()
 
 	if rootFlags.PprofAddr != "" {
 		logger.Info("Starting pprof server")
@@ -106,7 +106,7 @@ func startRoot(cmd *cobra.Command, args []string) {
 		}()
 	}
 
-	nodesRepo := repo.New(dbConn)
+	nodesRepo := repo.New(readConn, writeConn)
 	cr, err := crawler.New(nodesRepo, crawler.CrawlerOptions{
 		Logger:     logger,
 		HTTPAddr:   rootFlags.HTTPAddr,

flake.nix

@@ -18,8 +18,6 @@
           subPackages = [ "cmd/toxstatus" ];
           vendorHash = "sha256-5cVWDVroDrC32xq5p0DkeRBgxHGfA178JdfgiPvnAbw=";
 
-          tags = ["sqlite_foreign_keys"];
-
           ldflags = let
             pkgPath = "github.com/Tox/ToxStatus/internal/version";
           in [

internal/crawler/crawler.go

@@ -595,7 +595,7 @@ func (c *Crawler) receivePacket(ctx context.Context, data []byte, addr *net.UDPA
 		c.handleInfoChan <- &infoPacket{Addr: addr, Packet: bsPacket}
 		return nil
 	}
-	if err != nil && !errors.Is(err, bootstrap.ErrUnknownPacketType) {
+	if !errors.Is(err, bootstrap.ErrUnknownPacketType) {
 		return fmt.Errorf("bootstrap info packet check: %w", err)
 	}
 

internal/db/open.go

@@ -0,0 +1,74 @@
+package db
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+	"net/url"
+	"runtime"
+)
+
+type OpenOptions struct {
+	CacheSize int
+	Params    map[string]string
+}
+
+func OpenReadWrite(ctx context.Context, dbFile string, opts OpenOptions) (rdb *sql.DB, wdb *sql.DB, err error) {
+	uri := &url.URL{
+		Scheme: "file",
+		Opaque: dbFile,
+	}
+	query := uri.Query()
+	if opts.Params != nil {
+		for k, v := range opts.Params {
+			query.Set(k, v)
+		}
+	}
+	query.Set("_txlock", "immediate")
+	uri.RawQuery = query.Encode()
+
+	pragmas := fmt.Sprintf(`
+		PRAGMA journal_mode = WAL;
+		PRAGMA busy_timeout = 5000;
+		PRAGMA synchronous = NORMAL;
+		PRAGMA cache_size = -%d;
+		PRAGMA foreign_keys = true;
+		PRAGMA temp_store = memory;
+	`, opts.CacheSize)
+
+	readConn, err := sql.Open("sqlite3", uri.String())
+	if err != nil {
+		return nil, nil, err
+	}
+	defer func() {
+		if err != nil {
+			readConn.Close()
+		}
+	}()
+	readConn.SetMaxOpenConns(max(4, runtime.NumCPU()))
+
+	if _, err = readConn.ExecContext(ctx, pragmas); err != nil {
+		return nil, nil, fmt.Errorf("configure db conn: %w", err)
+	}
+
+	writeConn, err := sql.Open("sqlite3", uri.String())
+	if err != nil {
+		return nil, nil, err
+	}
+	defer func() {
+		if err != nil {
+			writeConn.Close()
+		}
+	}()
+	writeConn.SetMaxOpenConns(1)
+
+	if _, err = writeConn.ExecContext(ctx, pragmas); err != nil {
+		return nil, nil, fmt.Errorf("configure db conn: %w", err)
+	}
+
+	if _, err = writeConn.ExecContext(ctx, Schema); err != nil {
+		return nil, nil, fmt.Errorf("init db: %w", err)
+	}
+
+	return readConn, writeConn, nil
+}

internal/db/types.go

@@ -1,8 +1,3 @@
-//go:build sqlite_foreign_keys
-
-// By specifying our go-sqlite3 build tags above, the build will fail if we
-// forget to specify it in the go build/test command.
-
 package db
 
 import (

internal/repo/repo.go

@@ -17,24 +17,26 @@ import (
 var ErrNotFound = fmt.Errorf("not found: %w", sql.ErrNoRows)
 
 type NodesRepo struct {
-	db *sql.DB
-	q  *db.Queries
+	wdb *sql.DB
+	rq  *db.Queries
+	wq  *db.Queries
 }
 
 type nodeAddressCombo struct {
 	Node        db.Node
 	NodeAddress db.NodeAddress
 }
 
-func New(sqldb *sql.DB) *NodesRepo {
+func New(rdb *sql.DB, wdb *sql.DB) *NodesRepo {
 	return &NodesRepo{
-		db: sqldb,
-		q:  db.New(sqldb),
+		wdb: wdb,
+		rq:  db.New(rdb),
+		wq:  db.New(wdb),
 	}
 }
 
 func (r *NodesRepo) GetNodeByPublicKey(ctx context.Context, pk *dht.PublicKey) (*models.Node, error) {
-	rows, err := r.q.GetNodeByPublicKey(ctx, (*db.PublicKey)(pk))
+	rows, err := r.rq.GetNodeByPublicKey(ctx, (*db.PublicKey)(pk))
 	if err != nil {
 		return nil, err
 	}
@@ -53,7 +55,7 @@ func (r *NodesRepo) GetNodeByPublicKey(ctx context.Context, pk *dht.PublicKey) (
 }
 
 func (r *NodesRepo) HasNodeByPublicKey(ctx context.Context, pk *dht.PublicKey) (bool, error) {
-	res, err := r.q.HasNodeByPublicKey(ctx, (*db.PublicKey)(pk))
+	res, err := r.rq.HasNodeByPublicKey(ctx, (*db.PublicKey)(pk))
 	if err != nil {
 		return false, err
 	}
@@ -62,17 +64,17 @@ func (r *NodesRepo) HasNodeByPublicKey(ctx context.Context, pk *dht.PublicKey) (
 }
 
 func (r *NodesRepo) GetNodeCount(ctx context.Context) (int64, error) {
-	return r.q.GetNodeCount(ctx)
+	return r.rq.GetNodeCount(ctx)
 }
 
 func (r *NodesRepo) TrackDHTNode(ctx context.Context, node *dht.Node) (*models.Node, error) {
-	tx, err := r.db.Begin()
+	tx, err := r.wdb.Begin()
 	if err != nil {
 		return nil, err
 	}
 	defer tx.Rollback()
 
-	q := r.q.WithTx(tx)
+	q := r.wq.WithTx(tx)
 	dbNode, err := q.UpsertNode(ctx, (*db.PublicKey)(node.PublicKey))
 	if err != nil {
 		return nil, fmt.Errorf("upsert node: %w", err)
@@ -99,7 +101,7 @@ func (r *NodesRepo) TrackDHTNode(ctx context.Context, node *dht.Node) (*models.N
 }
 
 func (r *NodesRepo) getDHTNodeAddressID(ctx context.Context, node *dht.Node) (int64, error) {
-	return r.q.GetNodeAddress(ctx, &db.GetNodeAddressParams{
+	return r.rq.GetNodeAddress(ctx, &db.GetNodeAddressParams{
 		PublicKey: (*db.PublicKey)(node.PublicKey),
 		Net:       node.Type.Net(),
 		Ip:        node.IP.String(),
@@ -116,7 +118,7 @@ func (r *NodesRepo) PingDHTNode(ctx context.Context, node *dht.Node) error {
 		return err
 	}
 
-	return r.q.PingNodeAddress(ctx, id)
+	return r.rq.PingNodeAddress(ctx, id)
 }
 
 func (r *NodesRepo) PongDHTNode(ctx context.Context, node *dht.Node) error {
@@ -128,11 +130,11 @@ func (r *NodesRepo) PongDHTNode(ctx context.Context, node *dht.Node) error {
 		return err
 	}
 
-	return r.q.PongNodeAddress(ctx, id)
+	return r.rq.PongNodeAddress(ctx, id)
 }
 
 func (r *NodesRepo) GetNodesWithStaleBootstrapInfo(ctx context.Context) ([]*models.Node, error) {
-	rows, err := r.q.GetNodesWithStaleBootstrapInfo(ctx, &db.GetNodesWithStaleBootstrapInfoParams{
+	rows, err := r.rq.GetNodesWithStaleBootstrapInfo(ctx, &db.GetNodesWithStaleBootstrapInfoParams{
 		NodeTimeout:  (5 * time.Minute).Seconds(),
 		InfoInterval: (1 * time.Minute).Seconds(),
 	})
@@ -156,13 +158,13 @@ func (r *NodesRepo) GetNodesWithStaleBootstrapInfo(ctx context.Context) ([]*mode
 }
 
 func (r *NodesRepo) UpdateNodeInfoRequestTime(ctx context.Context, addrReqTimes map[int64]time.Time) error {
-	tx, err := r.db.Begin()
+	tx, err := r.wdb.Begin()
 	if err != nil {
 		return err
 	}
 	defer tx.Rollback()
 
-	q := r.q.WithTx(tx)
+	q := r.wq.WithTx(tx)
 	for id, reqTime := range addrReqTimes {
 		if err := q.UpdateNodeInfoRequestTime(ctx, &db.UpdateNodeInfoRequestTimeParams{
 			ID:            id,
@@ -176,7 +178,7 @@ func (r *NodesRepo) UpdateNodeInfoRequestTime(ctx context.Context, addrReqTimes
 }
 
 func (r *NodesRepo) UpdateNodeInfo(ctx context.Context, addr *net.UDPAddr, motd string, version uint32) error {
-	tx, err := r.db.Begin()
+	tx, err := r.wdb.Begin()
 	if err != nil {
 		return err
 	}
@@ -189,8 +191,8 @@ func (r *NodesRepo) UpdateNodeInfo(ctx context.Context, addr *net.UDPAddr, motd
 		nodeType = dht.NodeTypeUDPIP6
 	}
 
-	q := r.q.WithTx(tx)
-	node, err := r.q.GetNodeByInfoResponseAddress(ctx, &db.GetNodeByInfoResponseAddressParams{
+	q := r.wq.WithTx(tx)
+	node, err := q.GetNodeByInfoResponseAddress(ctx, &db.GetNodeByInfoResponseAddressParams{
 		InfoReqTimeout: (10 * time.Second).Seconds(),
 		Net:            nodeType.Net(),
 		Ip:             addr.IP.String(),
@@ -212,7 +214,7 @@ func (r *NodesRepo) UpdateNodeInfo(ctx context.Context, addr *net.UDPAddr, motd
 }
 
 func (r *NodesRepo) GetResponsiveDHTNodes(ctx context.Context) ([]*dht.Node, error) {
-	rows, err := r.q.GetResponsiveNodes(ctx)
+	rows, err := r.rq.GetResponsiveNodes(ctx)
 	if err != nil {
 		return nil, err
 	}
@@ -229,7 +231,7 @@ func (r *NodesRepo) GetResponsiveDHTNodes(ctx context.Context) ([]*dht.Node, err
 }
 
 func (r *NodesRepo) GetUnresponsiveDHTNodes(ctx context.Context, retryDelay time.Duration) ([]*dht.Node, error) {
-	rows, err := r.q.GetUnresponsiveNodes(ctx, retryDelay.Seconds())
+	rows, err := r.rq.GetUnresponsiveNodes(ctx, retryDelay.Seconds())
 	if err != nil {
 		return nil, err
 	}