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mysql.go
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/
mysql.go
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// Copyright (c) 2015-2023 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// 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 target
import (
"context"
"database/sql"
"encoding/json"
"errors"
"fmt"
"net/url"
"os"
"path/filepath"
"strconv"
"strings"
"time"
"github.com/go-sql-driver/mysql"
"github.com/minio/minio/internal/event"
"github.com/minio/minio/internal/logger"
"github.com/minio/minio/internal/once"
"github.com/minio/minio/internal/store"
xnet "github.com/minio/pkg/v2/net"
)
const (
mysqlTableExists = `SELECT 1 FROM %s;`
// Some MySQL has a 3072 byte limit on key sizes.
mysqlCreateNamespaceTable = `CREATE TABLE %s (
key_name VARCHAR(3072) NOT NULL,
key_hash CHAR(64) GENERATED ALWAYS AS (SHA2(key_name, 256)) STORED NOT NULL PRIMARY KEY,
value JSON)
CHARACTER SET = utf8mb4 COLLATE = utf8mb4_bin ROW_FORMAT = Dynamic;`
mysqlCreateAccessTable = `CREATE TABLE %s (event_time DATETIME NOT NULL, event_data JSON)
ROW_FORMAT = Dynamic;`
mysqlUpdateRow = `INSERT INTO %s (key_name, value) VALUES (?, ?) ON DUPLICATE KEY UPDATE value=VALUES(value);`
mysqlDeleteRow = `DELETE FROM %s WHERE key_hash = SHA2(?, 256);`
mysqlInsertRow = `INSERT INTO %s (event_time, event_data) VALUES (?, ?);`
)
// MySQL related constants
const (
MySQLFormat = "format"
MySQLDSNString = "dsn_string"
MySQLTable = "table"
MySQLHost = "host"
MySQLPort = "port"
MySQLUsername = "username"
MySQLPassword = "password"
MySQLDatabase = "database"
MySQLQueueLimit = "queue_limit"
MySQLQueueDir = "queue_dir"
MySQLMaxOpenConnections = "max_open_connections"
EnvMySQLEnable = "MINIO_NOTIFY_MYSQL_ENABLE"
EnvMySQLFormat = "MINIO_NOTIFY_MYSQL_FORMAT"
EnvMySQLDSNString = "MINIO_NOTIFY_MYSQL_DSN_STRING"
EnvMySQLTable = "MINIO_NOTIFY_MYSQL_TABLE"
EnvMySQLHost = "MINIO_NOTIFY_MYSQL_HOST"
EnvMySQLPort = "MINIO_NOTIFY_MYSQL_PORT"
EnvMySQLUsername = "MINIO_NOTIFY_MYSQL_USERNAME"
EnvMySQLPassword = "MINIO_NOTIFY_MYSQL_PASSWORD"
EnvMySQLDatabase = "MINIO_NOTIFY_MYSQL_DATABASE"
EnvMySQLQueueLimit = "MINIO_NOTIFY_MYSQL_QUEUE_LIMIT"
EnvMySQLQueueDir = "MINIO_NOTIFY_MYSQL_QUEUE_DIR"
EnvMySQLMaxOpenConnections = "MINIO_NOTIFY_MYSQL_MAX_OPEN_CONNECTIONS"
)
// MySQLArgs - MySQL target arguments.
type MySQLArgs struct {
Enable bool `json:"enable"`
Format string `json:"format"`
DSN string `json:"dsnString"`
Table string `json:"table"`
Host xnet.URL `json:"host"`
Port string `json:"port"`
User string `json:"user"`
Password string `json:"password"`
Database string `json:"database"`
QueueDir string `json:"queueDir"`
QueueLimit uint64 `json:"queueLimit"`
MaxOpenConnections int `json:"maxOpenConnections"`
}
// Validate MySQLArgs fields
func (m MySQLArgs) Validate() error {
if !m.Enable {
return nil
}
if m.Format != "" {
f := strings.ToLower(m.Format)
if f != event.NamespaceFormat && f != event.AccessFormat {
return fmt.Errorf("unrecognized format")
}
}
if m.Table == "" {
return fmt.Errorf("table unspecified")
}
if m.DSN != "" {
if _, err := mysql.ParseDSN(m.DSN); err != nil {
return err
}
} else {
// Some fields need to be specified when DSN is unspecified
if m.Port == "" {
return fmt.Errorf("unspecified port")
}
if _, err := strconv.Atoi(m.Port); err != nil {
return fmt.Errorf("invalid port")
}
if m.Database == "" {
return fmt.Errorf("database unspecified")
}
}
if m.QueueDir != "" {
if !filepath.IsAbs(m.QueueDir) {
return errors.New("queueDir path should be absolute")
}
}
if m.MaxOpenConnections < 0 {
return errors.New("maxOpenConnections cannot be less than zero")
}
return nil
}
// MySQLTarget - MySQL target.
type MySQLTarget struct {
initOnce once.Init
id event.TargetID
args MySQLArgs
updateStmt *sql.Stmt
deleteStmt *sql.Stmt
insertStmt *sql.Stmt
db *sql.DB
store store.Store[event.Event]
firstPing bool
loggerOnce logger.LogOnce
quitCh chan struct{}
}
// ID - returns target ID.
func (target *MySQLTarget) ID() event.TargetID {
return target.id
}
// Name - returns the Name of the target.
func (target *MySQLTarget) Name() string {
return target.ID().String()
}
// Store returns any underlying store if set.
func (target *MySQLTarget) Store() event.TargetStore {
return target.store
}
// IsActive - Return true if target is up and active
func (target *MySQLTarget) IsActive() (bool, error) {
if err := target.init(); err != nil {
return false, err
}
return target.isActive()
}
func (target *MySQLTarget) isActive() (bool, error) {
if err := target.db.Ping(); err != nil {
if IsConnErr(err) {
return false, store.ErrNotConnected
}
return false, err
}
return true, nil
}
// Save - saves the events to the store which will be replayed when the SQL connection is active.
func (target *MySQLTarget) Save(eventData event.Event) error {
if target.store != nil {
return target.store.Put(eventData)
}
if err := target.init(); err != nil {
return err
}
_, err := target.isActive()
if err != nil {
return err
}
return target.send(eventData)
}
// send - sends an event to the mysql.
func (target *MySQLTarget) send(eventData event.Event) error {
if target.args.Format == event.NamespaceFormat {
objectName, err := url.QueryUnescape(eventData.S3.Object.Key)
if err != nil {
return err
}
key := eventData.S3.Bucket.Name + "/" + objectName
if eventData.EventName == event.ObjectRemovedDelete {
_, err = target.deleteStmt.Exec(key)
} else {
var data []byte
if data, err = json.Marshal(struct{ Records []event.Event }{[]event.Event{eventData}}); err != nil {
return err
}
_, err = target.updateStmt.Exec(key, data)
}
return err
}
if target.args.Format == event.AccessFormat {
eventTime, err := time.Parse(event.AMZTimeFormat, eventData.EventTime)
if err != nil {
return err
}
data, err := json.Marshal(struct{ Records []event.Event }{[]event.Event{eventData}})
if err != nil {
return err
}
_, err = target.insertStmt.Exec(eventTime, data)
return err
}
return nil
}
// SendFromStore - reads an event from store and sends it to MySQL.
func (target *MySQLTarget) SendFromStore(key store.Key) error {
if err := target.init(); err != nil {
return err
}
_, err := target.isActive()
if err != nil {
return err
}
if !target.firstPing {
if err := target.executeStmts(); err != nil {
if IsConnErr(err) {
return store.ErrNotConnected
}
return err
}
}
eventData, eErr := target.store.Get(key.Name)
if eErr != nil {
// The last event key in a successful batch will be sent in the channel atmost once by the replayEvents()
// Such events will not exist and wouldve been already been sent successfully.
if os.IsNotExist(eErr) {
return nil
}
return eErr
}
if err := target.send(eventData); err != nil {
if IsConnErr(err) {
return store.ErrNotConnected
}
return err
}
// Delete the event from store.
return target.store.Del(key.Name)
}
// Close - closes underneath connections to MySQL database.
func (target *MySQLTarget) Close() error {
close(target.quitCh)
if target.updateStmt != nil {
// FIXME: log returned error. ignore time being.
_ = target.updateStmt.Close()
}
if target.deleteStmt != nil {
// FIXME: log returned error. ignore time being.
_ = target.deleteStmt.Close()
}
if target.insertStmt != nil {
// FIXME: log returned error. ignore time being.
_ = target.insertStmt.Close()
}
if target.db != nil {
return target.db.Close()
}
return nil
}
// Executes the table creation statements.
func (target *MySQLTarget) executeStmts() error {
_, err := target.db.Exec(fmt.Sprintf(mysqlTableExists, target.args.Table))
if err != nil {
createStmt := mysqlCreateNamespaceTable
if target.args.Format == event.AccessFormat {
createStmt = mysqlCreateAccessTable
}
if _, dbErr := target.db.Exec(fmt.Sprintf(createStmt, target.args.Table)); dbErr != nil {
return dbErr
}
}
switch target.args.Format {
case event.NamespaceFormat:
// insert or update statement
if target.updateStmt, err = target.db.Prepare(fmt.Sprintf(mysqlUpdateRow, target.args.Table)); err != nil {
return err
}
// delete statement
if target.deleteStmt, err = target.db.Prepare(fmt.Sprintf(mysqlDeleteRow, target.args.Table)); err != nil {
return err
}
case event.AccessFormat:
// insert statement
if target.insertStmt, err = target.db.Prepare(fmt.Sprintf(mysqlInsertRow, target.args.Table)); err != nil {
return err
}
}
return nil
}
func (target *MySQLTarget) init() error {
return target.initOnce.Do(target.initMySQL)
}
func (target *MySQLTarget) initMySQL() error {
args := target.args
db, err := sql.Open("mysql", args.DSN)
if err != nil {
target.loggerOnce(context.Background(), err, target.ID().String())
return err
}
target.db = db
if args.MaxOpenConnections > 0 {
// Set the maximum connections limit
target.db.SetMaxOpenConns(args.MaxOpenConnections)
}
err = target.db.Ping()
if err != nil {
if !(xnet.IsConnRefusedErr(err) || xnet.IsConnResetErr(err)) {
target.loggerOnce(context.Background(), err, target.ID().String())
}
} else {
if err = target.executeStmts(); err != nil {
target.loggerOnce(context.Background(), err, target.ID().String())
} else {
target.firstPing = true
}
}
if err != nil {
target.db.Close()
return err
}
yes, err := target.isActive()
if err != nil {
return err
}
if !yes {
return store.ErrNotConnected
}
return nil
}
// NewMySQLTarget - creates new MySQL target.
func NewMySQLTarget(id string, args MySQLArgs, loggerOnce logger.LogOnce) (*MySQLTarget, error) {
var queueStore store.Store[event.Event]
if args.QueueDir != "" {
queueDir := filepath.Join(args.QueueDir, storePrefix+"-mysql-"+id)
queueStore = store.NewQueueStore[event.Event](queueDir, args.QueueLimit, event.StoreExtension)
if err := queueStore.Open(); err != nil {
return nil, fmt.Errorf("unable to initialize the queue store of MySQL `%s`: %w", id, err)
}
}
if args.DSN == "" {
config := mysql.Config{
User: args.User,
Passwd: args.Password,
Net: "tcp",
Addr: args.Host.String() + ":" + args.Port,
DBName: args.Database,
AllowNativePasswords: true,
CheckConnLiveness: true,
}
args.DSN = config.FormatDSN()
}
target := &MySQLTarget{
id: event.TargetID{ID: id, Name: "mysql"},
args: args,
firstPing: false,
store: queueStore,
loggerOnce: loggerOnce,
quitCh: make(chan struct{}),
}
if target.store != nil {
store.StreamItems(target.store, target, target.quitCh, target.loggerOnce)
}
return target, nil
}