gotosocial/internal/db/bundb/bundb.go
kim 6738fd5bb0
[feature/performance] sqlite pragma optimize on close (#2596)
* wrap database drivers in order to handle error processing, hooks, etc

* remove dead code

* add code comment, remove unused blank imports
2024-02-07 14:43:27 +00:00

557 lines
16 KiB
Go

// GoToSocial
// Copyright (C) GoToSocial Authors admin@gotosocial.org
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// 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 <http://www.gnu.org/licenses/>.
package bundb
import (
"context"
"crypto/tls"
"crypto/x509"
"database/sql"
"encoding/pem"
"errors"
"fmt"
"net/url"
"os"
"runtime"
"strings"
"time"
"codeberg.org/gruf/go-bytesize"
"github.com/google/uuid"
"github.com/jackc/pgx/v5"
"github.com/jackc/pgx/v5/stdlib"
"github.com/superseriousbusiness/gotosocial/internal/config"
"github.com/superseriousbusiness/gotosocial/internal/db"
"github.com/superseriousbusiness/gotosocial/internal/db/bundb/migrations"
"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
"github.com/superseriousbusiness/gotosocial/internal/log"
"github.com/superseriousbusiness/gotosocial/internal/metrics"
"github.com/superseriousbusiness/gotosocial/internal/state"
"github.com/superseriousbusiness/gotosocial/internal/tracing"
"github.com/uptrace/bun"
"github.com/uptrace/bun/dialect"
"github.com/uptrace/bun/dialect/pgdialect"
"github.com/uptrace/bun/dialect/sqlitedialect"
"github.com/uptrace/bun/migrate"
"modernc.org/sqlite"
)
// DBService satisfies the DB interface
type DBService struct {
db.Account
db.Admin
db.Application
db.Basic
db.Domain
db.Emoji
db.HeaderFilter
db.Instance
db.List
db.Marker
db.Media
db.Mention
db.Notification
db.Poll
db.Relationship
db.Report
db.Rule
db.Search
db.Session
db.Status
db.StatusBookmark
db.StatusFave
db.Tag
db.Thread
db.Timeline
db.User
db.Tombstone
db *bun.DB
}
// GetDB returns the underlying database connection pool.
// Should only be used in testing + exceptional circumstance.
func (dbService *DBService) DB() *bun.DB {
return dbService.db
}
func doMigration(ctx context.Context, db *bun.DB) error {
migrator := migrate.NewMigrator(db, migrations.Migrations)
if err := migrator.Init(ctx); err != nil {
return err
}
group, err := migrator.Migrate(ctx)
if err != nil && !strings.Contains(err.Error(), "no migrations") {
return err
}
if group == nil || group.ID == 0 {
log.Info(ctx, "there are no new migrations to run")
return nil
}
log.Infof(ctx, "MIGRATED DATABASE TO %s", group)
if db.Dialect().Name() == dialect.SQLite {
log.Info(ctx, "running ANALYZE to update table and index statistics")
_, err := db.ExecContext(ctx, "ANALYZE")
if err != nil {
log.Warnf(ctx, "ANALYZE failed, query planner may make poor life choices: %s", err)
}
}
return nil
}
// NewBunDBService returns a bunDB derived from the provided config, which implements the go-fed DB interface.
// Under the hood, it uses https://github.com/uptrace/bun to create and maintain a database connection.
func NewBunDBService(ctx context.Context, state *state.State) (db.DB, error) {
var db *bun.DB
var err error
t := strings.ToLower(config.GetDbType())
switch t {
case "postgres":
db, err = pgConn(ctx, state)
if err != nil {
return nil, err
}
case "sqlite":
db, err = sqliteConn(ctx, state)
if err != nil {
return nil, err
}
default:
return nil, fmt.Errorf("database type %s not supported for bundb", t)
}
// Add database query hooks.
db.AddQueryHook(queryHook{})
if config.GetTracingEnabled() {
db.AddQueryHook(tracing.InstrumentBun())
}
if config.GetMetricsEnabled() {
db.AddQueryHook(metrics.InstrumentBun())
}
// table registration is needed for many-to-many, see:
// https://bun.uptrace.dev/orm/many-to-many-relation/
for _, t := range []interface{}{
&gtsmodel.AccountToEmoji{},
&gtsmodel.StatusToEmoji{},
&gtsmodel.StatusToTag{},
&gtsmodel.ThreadToStatus{},
} {
db.RegisterModel(t)
}
// perform any pending database migrations: this includes
// the very first 'migration' on startup which just creates
// necessary tables
if err := doMigration(ctx, db); err != nil {
return nil, fmt.Errorf("db migration error: %s", err)
}
ps := &DBService{
Account: &accountDB{
db: db,
state: state,
},
Admin: &adminDB{
db: db,
state: state,
},
Application: &applicationDB{
db: db,
state: state,
},
Basic: &basicDB{
db: db,
},
Domain: &domainDB{
db: db,
state: state,
},
Emoji: &emojiDB{
db: db,
state: state,
},
HeaderFilter: &headerFilterDB{
db: db,
state: state,
},
Instance: &instanceDB{
db: db,
state: state,
},
List: &listDB{
db: db,
state: state,
},
Marker: &markerDB{
db: db,
state: state,
},
Media: &mediaDB{
db: db,
state: state,
},
Mention: &mentionDB{
db: db,
state: state,
},
Notification: &notificationDB{
db: db,
state: state,
},
Poll: &pollDB{
db: db,
state: state,
},
Relationship: &relationshipDB{
db: db,
state: state,
},
Report: &reportDB{
db: db,
state: state,
},
Rule: &ruleDB{
db: db,
state: state,
},
Search: &searchDB{
db: db,
state: state,
},
Session: &sessionDB{
db: db,
},
Status: &statusDB{
db: db,
state: state,
},
StatusBookmark: &statusBookmarkDB{
db: db,
state: state,
},
StatusFave: &statusFaveDB{
db: db,
state: state,
},
Tag: &tagDB{
db: db,
state: state,
},
Thread: &threadDB{
db: db,
state: state,
},
Timeline: &timelineDB{
db: db,
state: state,
},
User: &userDB{
db: db,
state: state,
},
Tombstone: &tombstoneDB{
db: db,
state: state,
},
db: db,
}
// we can confidently return this useable service now
return ps, nil
}
func pgConn(ctx context.Context, state *state.State) (*bun.DB, error) {
opts, err := deriveBunDBPGOptions() //nolint:contextcheck
if err != nil {
return nil, fmt.Errorf("could not create bundb postgres options: %w", err)
}
cfg := stdlib.RegisterConnConfig(opts)
sqldb, err := sql.Open("pgx-gts", cfg)
if err != nil {
return nil, fmt.Errorf("could not open postgres db: %w", err)
}
// Tune db connections for postgres, see:
// - https://bun.uptrace.dev/guide/running-bun-in-production.html#database-sql
// - https://www.alexedwards.net/blog/configuring-sqldb
sqldb.SetMaxOpenConns(maxOpenConns()) // x number of conns per CPU
sqldb.SetMaxIdleConns(2) // assume default 2; if max idle is less than max open, it will be automatically adjusted
sqldb.SetConnMaxLifetime(5 * time.Minute) // fine to kill old connections
db := bun.NewDB(sqldb, pgdialect.New())
// ping to check the db is there and listening
if err := db.PingContext(ctx); err != nil {
return nil, fmt.Errorf("postgres ping: %w", err)
}
log.Info(ctx, "connected to POSTGRES database")
return db, nil
}
func sqliteConn(ctx context.Context, state *state.State) (*bun.DB, error) {
// validate db address has actually been set
address := config.GetDbAddress()
if address == "" {
return nil, fmt.Errorf("'%s' was not set when attempting to start sqlite", config.DbAddressFlag())
}
// Build SQLite connection address with prefs.
address = buildSQLiteAddress(address)
// Open new DB instance
sqldb, err := sql.Open("sqlite-gts", address)
if err != nil {
if errWithCode, ok := err.(*sqlite.Error); ok {
err = errors.New(sqlite.ErrorCodeString[errWithCode.Code()])
}
return nil, fmt.Errorf("could not open sqlite db with address %s: %w", address, err)
}
// Tune db connections for sqlite, see:
// - https://bun.uptrace.dev/guide/running-bun-in-production.html#database-sql
// - https://www.alexedwards.net/blog/configuring-sqldb
sqldb.SetMaxOpenConns(maxOpenConns()) // x number of conns per CPU
sqldb.SetMaxIdleConns(1) // only keep max 1 idle connection around
sqldb.SetConnMaxLifetime(0) // don't kill connections due to age
db := bun.NewDB(sqldb, sqlitedialect.New())
// ping to check the db is there and listening
if err := db.PingContext(ctx); err != nil {
if errWithCode, ok := err.(*sqlite.Error); ok {
err = errors.New(sqlite.ErrorCodeString[errWithCode.Code()])
}
return nil, fmt.Errorf("sqlite ping: %w", err)
}
log.Infof(ctx, "connected to SQLITE database with address %s", address)
return db, nil
}
/*
HANDY STUFF
*/
// maxOpenConns returns multiplier * GOMAXPROCS,
// returning just 1 instead if multiplier < 1.
func maxOpenConns() int {
multiplier := config.GetDbMaxOpenConnsMultiplier()
if multiplier < 1 {
return 1
}
return multiplier * runtime.GOMAXPROCS(0)
}
// deriveBunDBPGOptions takes an application config and returns either a ready-to-use set of options
// with sensible defaults, or an error if it's not satisfied by the provided config.
func deriveBunDBPGOptions() (*pgx.ConnConfig, error) {
// these are all optional, the db adapter figures out defaults
address := config.GetDbAddress()
// validate database
database := config.GetDbDatabase()
if database == "" {
return nil, errors.New("no database set")
}
var tlsConfig *tls.Config
switch config.GetDbTLSMode() {
case "", "disable":
break // nothing to do
case "enable":
tlsConfig = &tls.Config{
InsecureSkipVerify: true, //nolint:gosec
}
case "require":
tlsConfig = &tls.Config{
InsecureSkipVerify: false,
ServerName: address,
MinVersion: tls.VersionTLS12,
}
}
if certPath := config.GetDbTLSCACert(); tlsConfig != nil && certPath != "" {
// load the system cert pool first -- we'll append the given CA cert to this
certPool, err := x509.SystemCertPool()
if err != nil {
return nil, fmt.Errorf("error fetching system CA cert pool: %s", err)
}
// open the file itself and make sure there's something in it
caCertBytes, err := os.ReadFile(certPath)
if err != nil {
return nil, fmt.Errorf("error opening CA certificate at %s: %s", certPath, err)
}
if len(caCertBytes) == 0 {
return nil, fmt.Errorf("ca cert at %s was empty", certPath)
}
// make sure we have a PEM block
caPem, _ := pem.Decode(caCertBytes)
if caPem == nil {
return nil, fmt.Errorf("could not parse cert at %s into PEM", certPath)
}
// parse the PEM block into the certificate
caCert, err := x509.ParseCertificate(caPem.Bytes)
if err != nil {
return nil, fmt.Errorf("could not parse cert at %s into x509 certificate: %w", certPath, err)
}
// we're happy, add it to the existing pool and then use this pool in our tls config
certPool.AddCert(caCert)
tlsConfig.RootCAs = certPool
}
cfg, _ := pgx.ParseConfig("")
if address != "" {
cfg.Host = address
}
if port := config.GetDbPort(); port > 0 {
cfg.Port = uint16(port)
}
if u := config.GetDbUser(); u != "" {
cfg.User = u
}
if p := config.GetDbPassword(); p != "" {
cfg.Password = p
}
if tlsConfig != nil {
cfg.TLSConfig = tlsConfig
}
cfg.Database = database
cfg.RuntimeParams["application_name"] = config.GetApplicationName()
return cfg, nil
}
// buildSQLiteAddress will build an SQLite address string from given config input,
// appending user defined SQLite connection preferences (e.g. cache_size, journal_mode etc).
func buildSQLiteAddress(addr string) string {
// Notes on SQLite preferences:
//
// - SQLite by itself supports setting a subset of its configuration options
// via URI query arguments in the connection. Namely `mode` and `cache`.
// This is the same situation for the directly transpiled C->Go code in
// modernc.org/sqlite, i.e. modernc.org/sqlite/lib, NOT the Go SQL driver.
//
// - `modernc.org/sqlite` has a "shim" around it to allow the directly
// transpiled C code to be usable with a more native Go API. This is in
// the form of a `database/sql/driver.Driver{}` implementation that calls
// through to the transpiled C code.
//
// - The SQLite shim we interface with adds support for setting ANY of the
// configuration options via query arguments, through using a special `_pragma`
// query key that specifies SQLite PRAGMAs to set upon opening each connection.
// As such you will see below that most config is set with the `_pragma` key.
//
// - As for why we're setting these PRAGMAs by connection string instead of
// directly executing the PRAGMAs ourselves? That's to ensure that all of
// configuration options are set across _all_ of our SQLite connections, given
// that we are a multi-threaded (not directly in a C way) application and that
// each connection is a separate SQLite instance opening the same database.
// And the `database/sql` package provides transparent connection pooling.
// Some data is shared between connections, for example the `journal_mode`
// as that is set in a bit of the file header, but to be sure with the other
// settings we just add them all to the connection URI string.
//
// - We specifically set the `busy_timeout` PRAGMA before the `journal_mode`.
// When Write-Ahead-Logging (WAL) is enabled, in order to handle the issues
// that may arise between separate concurrent read/write threads racing for
// the same database file (and write-ahead log), SQLite will sometimes return
// an `SQLITE_BUSY` error code, which indicates that the query was aborted
// due to a data race and must be retried. The `busy_timeout` PRAGMA configures
// a function handler that SQLite can use internally to handle these data races,
// in that it will attempt to retry the query until the `busy_timeout` time is
// reached. And for whatever reason (:shrug:) SQLite is very particular about
// setting this BEFORE the `journal_mode` is set, otherwise you can end up
// running into more of these `SQLITE_BUSY` return codes than you might expect.
//
// - One final thing (I promise!): `SQLITE_BUSY` is only handled by the internal
// `busy_timeout` handler in the case that a data race occurs contending for
// table locks. THERE ARE STILL OTHER SITUATIONS IN WHICH THIS MAY BE RETURNED!
// As such, we use our wrapping DB{} and Tx{} types (in "db.go") which make use
// of our own retry-busy handler.
// Drop anything fancy from DB address
addr = strings.Split(addr, "?")[0] // drop any provided query strings
addr = strings.TrimPrefix(addr, "file:") // we'll prepend this later ourselves
// build our own SQLite preferences
// as a series of URL encoded values
prefs := make(url.Values)
// use immediate transaction lock mode to fail quickly if tx can't lock
// see https://pkg.go.dev/modernc.org/sqlite#Driver.Open
prefs.Add("_txlock", "immediate")
if addr == ":memory:" {
log.Warn(nil, "using sqlite in-memory mode; all data will be deleted when gts shuts down; this mode should only be used for debugging or running tests")
// Use random name for in-memory instead of ':memory:', so
// multiple in-mem databases can be created without conflict.
addr = uuid.NewString()
// in-mem-specific preferences
// (shared cache so that tests don't fail)
prefs.Add("mode", "memory")
prefs.Add("cache", "shared")
}
if dur := config.GetDbSqliteBusyTimeout(); dur > 0 {
// Set the user provided SQLite busy timeout
// NOTE: MUST BE SET BEFORE THE JOURNAL MODE.
prefs.Add("_pragma", fmt.Sprintf("busy_timeout(%d)", dur.Milliseconds()))
}
if mode := config.GetDbSqliteJournalMode(); mode != "" {
// Set the user provided SQLite journal mode.
prefs.Add("_pragma", fmt.Sprintf("journal_mode(%s)", mode))
}
if mode := config.GetDbSqliteSynchronous(); mode != "" {
// Set the user provided SQLite synchronous mode.
prefs.Add("_pragma", fmt.Sprintf("synchronous(%s)", mode))
}
if sz := config.GetDbSqliteCacheSize(); sz > 0 {
// Set the user provided SQLite cache size (in kibibytes)
// Prepend a '-' character to this to indicate to sqlite
// that we're giving kibibytes rather than num pages.
// https://www.sqlite.org/pragma.html#pragma_cache_size
prefs.Add("_pragma", fmt.Sprintf("cache_size(-%d)", uint64(sz/bytesize.KiB)))
}
var b strings.Builder
b.WriteString("file:")
b.WriteString(addr)
b.WriteString("?")
b.WriteString(prefs.Encode())
return b.String()
}