diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..e43b0f9 --- /dev/null +++ b/.gitignore @@ -0,0 +1 @@ +.DS_Store diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..a4bed1d --- /dev/null +++ b/go.mod @@ -0,0 +1,30 @@ +module github.com/longbridgeapp/gorm-sharding + +go 1.17 + +require ( + github.com/longbridgeapp/assert v0.1.0 + github.com/longbridgeapp/sqlparser v0.2.0 + github.com/stretchr/testify v1.7.0 + gorm.io/driver/postgres v1.1.0 + gorm.io/gorm v1.21.16 + gorm.io/hints v0.0.0-20210614014355-b8cf5492cb94 +) + +require ( + github.com/davecgh/go-spew v1.1.1 // indirect + github.com/jackc/chunkreader/v2 v2.0.1 // indirect + github.com/jackc/pgconn v1.9.1-0.20210724152538-d89c8390a530 // indirect + github.com/jackc/pgio v1.0.0 // indirect + github.com/jackc/pgpassfile v1.0.0 // indirect + github.com/jackc/pgproto3/v2 v2.1.1 // indirect + github.com/jackc/pgservicefile v0.0.0-20200714003250-2b9c44734f2b // indirect + github.com/jackc/pgtype v1.8.1 // indirect + github.com/jackc/pgx/v4 v4.12.1-0.20210724153913-640aa07df17c // indirect + github.com/jinzhu/inflection v1.0.0 // indirect + github.com/jinzhu/now v1.1.2 // indirect + github.com/pmezard/go-difflib v1.0.0 // indirect + golang.org/x/crypto v0.0.0-20210711020723-a769d52b0f97 // indirect + golang.org/x/text v0.3.6 // indirect + gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..e37b036 --- /dev/null +++ b/go.sum @@ -0,0 +1,515 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/Knetic/govaluate v3.0.1-0.20171022003610-9aa49832a739+incompatible/go.mod h1:r7JcOSlj0wfOMncg0iLm8Leh48TZaKVeNIfJntJ2wa0= +github.com/Masterminds/semver/v3 v3.1.1 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generator. diff --git a/keygen/README_zh.md b/keygen/README_zh.md new file mode 100644 index 0000000..7ccb4cf --- /dev/null +++ b/keygen/README_zh.md @@ -0,0 +1,3 @@ +# keygen + +分布式主键生成器。 diff --git a/keygen/id.go b/keygen/id.go new file mode 100644 index 0000000..329748f --- /dev/null +++ b/keygen/id.go @@ -0,0 +1,101 @@ +package keygen + +import ( + "errors" + "log" + "net" + "sync" + "time" +) + +// | 1bit unused | 41bits timestamp | 6bits worker |9bits table | 7bits sequence | +const ( + timeLeft = uint8(22) + workerLeft = uint8(16) + tableLeft = uint8(7) + twepoch = int64(1624204800000) // start from 2021-06-21 + seqMax = 127 +) + +type Sequence struct { + number int64 + timestamp int64 + sync.Mutex +} + +func (s *Sequence) next(timestamp int64) int64 { + s.Lock() + defer s.Unlock() + + if timestamp > s.timestamp { + s.timestamp = timestamp + s.number = 1 + } else { + s.number = s.number + 1 + } + + return s.number +} + +var sequence Sequence +var worker int64 + +func init() { + ipv4, err := getIPv4() + if err != nil { + log.Fatal(err) + } + worker = int64(ipv4[3]) % 64 + sequence = Sequence{} +} + +// Next generate a distributed Primary Key +// tableIdx - table sharding index +func Next(tableIdx int64) int64 { + var now int64 + var seq int64 + + for i := 0; i <= 10; i++ { + now = time.Now().UnixNano() / 1e6 + seq = sequence.next(now) + if seq <= seqMax { + break + } + time.Sleep(time.Microsecond * 100) + } + + return int64(((now - twepoch) << timeLeft) | + (worker << workerLeft) | + (tableIdx << tableLeft) | + seq) +} + +// getWorkerNumber get the worker number from id +func getWorkerNumber(id int64) int { + return int(id >> int64(workerLeft) & 63) +} + +// TableIdx get the table index from id +// Give a ID return idx of table shard +func TableIdx(id int64) int { + return int(id >> int64(tableLeft) & 511) +} + +// getIPv4 get the IPv4 address +func getIPv4() (ip net.IP, err error) { + addrs, err := net.InterfaceAddrs() + if err != nil { + return + } + + for _, a := range addrs { + if ipnet, ok := a.(*net.IPNet); ok && !ipnet.IP.IsLoopback() { + ipv4 := ipnet.IP.To4() + if ipv4 != nil { + return ipv4, nil + } + } + } + + return nil, errors.New("can not get ipv4") +} diff --git a/sharding.go b/sharding.go new file mode 100644 index 0000000..2e54da8 --- /dev/null +++ b/sharding.go @@ -0,0 +1,314 @@ +package gormsharding + +import ( + "errors" + "strconv" + "strings" + "sync" + + "github.com/longbridgeapp/sqlparser" + "gorm.io/gorm" +) + +var ( + ErrMissingShardingKey = errors.New("sharding key or id required, and use operator =") + ErrInvalidID = errors.New("invalid id format") +) + +type Sharding struct { + *gorm.DB + ConnPool *ConnPool + Resolvers map[string]Resolver + + querys sync.Map +} + +type Resolver struct { + // EnableFullTable whether to enable a full table + EnableFullTable bool + // ShardingColumn column name of the sharding column, for example: user_id + ShardingColumn string + // ShardingAlgorithm implement the sharding algorithm for generate table name suffix + ShardingAlgorithm func(columnValue interface{}) (suffix string, err error) + // ShardingAlgorithm sharding algorithm by primary key, if it posible. + ShardingAlgorithmByPrimaryKey func(id int64) (suffix string) + // PrimaryKeyGenerate for generate primary key + PrimaryKeyGenerate func(tableIdx int64) int64 +} + +func Register(resolvers map[string]Resolver) Sharding { + return Sharding{Resolvers: resolvers} +} + +// Name plugin name for Gorm plugin interface +func (s *Sharding) Name() string { + return "gorm:sharding" +} + +// LastQuery get last SQL query +func (s *Sharding) LastQuery() string { + if query, ok := s.querys.Load("last_query"); ok { + return query.(string) + } + + return "" +} + +// Initialize implement for Gorm plugin interface +func (s *Sharding) Initialize(db *gorm.DB) error { + s.DB = db + s.registerConnPool(db) + return nil +} + +// resolve split the old query to full table query and sharding table query +func (s *Sharding) resolve(query string, args ...interface{}) (ftQuery, stQuery, tableName string, err error) { + ftQuery = query + stQuery = query + if len(s.Resolvers) == 0 { + return + } + + expr, err := sqlparser.NewParser(strings.NewReader(query)).ParseStatement() + if err != nil { + return ftQuery, stQuery, tableName, nil + } + + var table *sqlparser.TableName + var condition sqlparser.Expr + var isInsert bool + var insertNames []*sqlparser.Ident + var insertValues []sqlparser.Expr + + switch stmt := expr.(type) { + case *sqlparser.SelectStatement: + tbl, ok := stmt.FromItems.(*sqlparser.TableName) + if !ok { + return + } + if stmt.Hint != nil && stmt.Hint.Value == "nosharding" { + return + } + table = tbl + condition = stmt.Condition + + case *sqlparser.InsertStatement: + table = stmt.TableName + isInsert = true + insertNames = stmt.ColumnNames + insertValues = stmt.Expressions[0].Exprs + case *sqlparser.UpdateStatement: + condition = stmt.Condition + table = stmt.TableName + case *sqlparser.DeleteStatement: + condition = stmt.Condition + table = stmt.TableName + default: + return ftQuery, stQuery, "", sqlparser.ErrNotImplemented + } + + tableName = table.Name.Name + r, ok := s.Resolvers[tableName] + if !ok { + return + } + + var value interface{} + var isID bool + if isInsert { + value, isID, err = s.insertValue(r.ShardingColumn, insertNames, insertValues, args...) + if err != nil { + return + } + } else { + value, isID, err = s.nonInsertValue(r.ShardingColumn, condition, args...) + if err != nil { + return + } + } + + var suffix string + + if isID { + if id, ok := value.(int64); ok { + suffix = r.ShardingAlgorithmByPrimaryKey(id) + } else if idUint, ok := value.(uint64); ok { + suffix = r.ShardingAlgorithmByPrimaryKey(int64(idUint)) + } else if idStr, ok := value.(string); ok { + id, err := strconv.ParseInt(idStr, 10, 64) + if err != nil { + return ftQuery, stQuery, tableName, ErrInvalidID + } + suffix = r.ShardingAlgorithmByPrimaryKey(id) + } else { + return ftQuery, stQuery, tableName, ErrInvalidID + } + } else { + suffix, err = r.ShardingAlgorithm(value) + if err != nil { + return + } + } + + newTable := &sqlparser.TableName{Name: &sqlparser.Ident{Name: tableName + suffix}} + + fillID := true + if isInsert { + for _, name := range insertNames { + if name.Name == "id" { + fillID = false + break + } + } + if fillID { + tblIdx, err := strconv.Atoi(strings.Replace(suffix, "_", "", 1)) + if err != nil { + return ftQuery, stQuery, tableName, err + } + id := r.PrimaryKeyGenerate(int64(tblIdx)) + insertNames = append(insertNames, &sqlparser.Ident{Name: "id"}) + insertValues = append(insertValues, &sqlparser.NumberLit{Value: strconv.FormatInt(id, 10)}) + } + } + + switch stmt := expr.(type) { + case *sqlparser.InsertStatement: + if fillID { + stmt.ColumnNames = insertNames + stmt.Expressions[0].Exprs = insertValues + } + ftQuery = stmt.String() + stmt.TableName = newTable + stQuery = stmt.String() + case *sqlparser.SelectStatement: + ftQuery = stmt.String() + stmt.FromItems = newTable + stmt.OrderBy = replaceOrderByTableName(stmt.OrderBy, tableName, newTable.Name.Name) + stQuery = stmt.String() + case *sqlparser.UpdateStatement: + ftQuery = stmt.String() + stmt.TableName = newTable + stQuery = stmt.String() + case *sqlparser.DeleteStatement: + ftQuery = stmt.String() + stmt.TableName = newTable + stQuery = stmt.String() + } + + return +} + +func (s *Sharding) insertValue(key string, names []*sqlparser.Ident, exprs []sqlparser.Expr, args ...interface{}) (value interface{}, isID bool, err error) { + bind := false + find := false + + if len(names) != len(exprs) { + return nil, false, errors.New("column names and expressions mismatch") + } + + for i, name := range names { + if name.Name == key { + switch expr := exprs[i].(type) { + case *sqlparser.BindExpr: + bind = true + value = expr.Name + case *sqlparser.StringLit: + value = expr.Value + case *sqlparser.NumberLit: + value = expr.Value + default: + return nil, false, sqlparser.ErrNotImplemented + } + find = true + break + } + } + if !find { + return nil, false, ErrMissingShardingKey + } + + if bind { + value, err = getBindValue(value, args) + } + + return +} + +func (s *Sharding) nonInsertValue(key string, condition sqlparser.Expr, args ...interface{}) (value interface{}, isID bool, err error) { + bind := false + find := false + + err = sqlparser.Walk(sqlparser.VisitFunc(func(node sqlparser.Node) error { + if n, ok := node.(*sqlparser.BinaryExpr); ok { + if x, ok := n.X.(*sqlparser.Ident); ok { + if x.Name == key && n.Op == sqlparser.EQ { + find = true + isID = false + bind = false + switch expr := n.Y.(type) { + case *sqlparser.BindExpr: + bind = true + value = expr.Name + case *sqlparser.StringLit: + value = expr.Value + case *sqlparser.NumberLit: + value = expr.Value + default: + return sqlparser.ErrNotImplemented + } + return nil + } else if x.Name == "id" && n.Op == sqlparser.EQ { + find = true + isID = true + bind = false + switch expr := n.Y.(type) { + case *sqlparser.BindExpr: + bind = true + value = expr.Name + case *sqlparser.NumberLit: + value = expr.Value + default: + return ErrInvalidID + } + return nil + } + } + } + return nil + }), condition) + if err != nil { + return + } + + if !find { + return nil, false, ErrMissingShardingKey + } + + if bind { + value, err = getBindValue(value, args) + } + + return +} + +func replaceOrderByTableName(orderBy []*sqlparser.OrderingTerm, oldName, newName string) []*sqlparser.OrderingTerm { + for i, term := range orderBy { + if x, ok := term.X.(*sqlparser.QualifiedRef); ok { + if x.Table.Name == oldName { + x.Table.Name = newName + orderBy[i].X = x + } + } + } + + return orderBy +} + +func getBindValue(value interface{}, args []interface{}) (interface{}, error) { + bindPos := strings.Replace(value.(string), "$", "", 1) + pos, err := strconv.Atoi(bindPos) + if err != nil { + return nil, err + } + return args[pos-1], nil +} diff --git a/sharding_test.go b/sharding_test.go new file mode 100644 index 0000000..702017b --- /dev/null +++ b/sharding_test.go @@ -0,0 +1,222 @@ +package gormsharding + +import ( + "fmt" + "os" + "strconv" + "testing" + + "github.com/longbridgeapp/assert" + "github.com/longbridgeapp/gorm-sharding/keygen" + "gorm.io/driver/postgres" + "gorm.io/gorm" + "gorm.io/hints" +) + +type Order struct { + ID int64 `gorm:"primarykey"` + UserID int64 + Product string +} + +type Category struct { + ID int64 `gorm:"primarykey"` + Name string +} + +func databaseURL() string { + databaseURL := os.Getenv("DATABASE_URL") + if len(databaseURL) == 0 { + databaseURL = "postgres://localhost:5432/sharding-test?sslmode=disable" + } + return databaseURL +} + +var ( + dbConfig = postgres.Config{ + DSN: databaseURL(), + PreferSimpleProtocol: true, + } + db, _ = gorm.Open(postgres.New(dbConfig), &gorm.Config{ + DisableForeignKeyConstraintWhenMigrating: true, + }) + + sharding = Register(map[string]Resolver{ + "orders": { + EnableFullTable: true, + ShardingColumn: "user_id", + ShardingAlgorithm: func(value interface{}) (suffix string, err error) { + userId := 0 + switch value := value.(type) { + case int: + userId = value + case int64: + userId = int(value) + case string: + userId, err = strconv.Atoi(value) + if err != nil { + return "", err + } + default: + return "", err + } + return fmt.Sprintf("_%03d", userId%8), nil + }, + ShardingAlgorithmByPrimaryKey: func(id int64) (suffix string) { + return fmt.Sprintf("_%03d", keygen.TableIdx(id)) + }, + PrimaryKeyGenerate: func(tableIdx int64) int64 { + return keygen.Next(tableIdx) + }, + }, + }) +) + +var tables = []string{"orders", "categories"} + +func init() { + dropTables() + err := db.AutoMigrate(&Order{}, &Category{}) + if err != nil { + panic(err) + } + db.Use(&sharding) +} + +func dropTables() { + for _, tableName := range tables { + db.Exec("DROP TABLE IF EXISTS " + tableName) + } +} + +func TestInsert(t *testing.T) { + tx := db.Create(&Order{ID: 100, UserID: 100, Product: "iPhone"}) + assertQueryResult(t, `INSERT INTO "orders_004" ("user_id", "product", "id") VALUES ($1, $2, $3) RETURNING "id"`, tx) +} + +func TestFillID(t *testing.T) { + db.Create(&Order{UserID: 100, Product: "iPhone"}) + lastQuery := sharding.LastQuery() + assert.Equal(t, `INSERT INTO "orders_004" ("user_id", "product", "id") VALUES`, lastQuery[0:57]) +} + +func TestSelect1(t *testing.T) { + tx := db.Model(&Order{}).Where("user_id", 101).Where("id", keygen.Next(24)).Find(&[]Order{}) + assertQueryResult(t, `SELECT * FROM "orders_024" WHERE "user_id" = $1 AND "id" = $2`, tx) +} + +func TestSelect2(t *testing.T) { + tx := db.Model(&Order{}).Where("id", keygen.Next(24)).Where("user_id", 101).Find(&[]Order{}) + assertQueryResult(t, `SELECT * FROM "orders_005" WHERE "id" = $1 AND "user_id" = $2`, tx) +} + +func TestSelect3(t *testing.T) { + tx := db.Model(&Order{}).Where("id", keygen.Next(24)).Where("user_id = 101").Find(&[]Order{}) + assertQueryResult(t, `SELECT * FROM "orders_005" WHERE "id" = $1 AND "user_id" = 101`, tx) +} + +func TestSelect4(t *testing.T) { + tx := db.Model(&Order{}).Where("product", "iPad").Where("user_id", 100).Find(&[]Order{}) + assertQueryResult(t, `SELECT * FROM "orders_004" WHERE "product" = $1 AND "user_id" = $2`, tx) +} + +func TestSelect5(t *testing.T) { + tx := db.Model(&Order{}).Where("user_id = 101").Find(&[]Order{}) + assertQueryResult(t, `SELECT * FROM "orders_005" WHERE "user_id" = 101`, tx) +} + +func TestSelect6(t *testing.T) { + tx := db.Model(&Order{}).Where("id", keygen.Next(24)).Find(&[]Order{}) + assertQueryResult(t, `SELECT * FROM "orders_024" WHERE "id" = $1`, tx) +} + +func TestSelect7(t *testing.T) { + tx := db.Model(&Order{}).Where("user_id", 101).Where("id > ?", keygen.Next(24)).Find(&[]Order{}) + assertQueryResult(t, `SELECT * FROM "orders_005" WHERE "user_id" = $1 AND "id" > $2`, tx) +} + +func TestSelect8(t *testing.T) { + tx := db.Model(&Order{}).Where("id > ?", keygen.Next(24)).Where("user_id", 101).Find(&[]Order{}) + assertQueryResult(t, `SELECT * FROM "orders_005" WHERE "id" > $1 AND "user_id" = $2`, tx) +} + +func TestSelect9(t *testing.T) { + tx := db.Model(&Order{}).Where("user_id = 101").First(&[]Order{}) + assertQueryResult(t, `SELECT * FROM "orders_005" WHERE "user_id" = 101 ORDER BY "orders_005"."id" LIMIT 1`, tx) +} + +func TestSelect10(t *testing.T) { + tx := db.Clauses(hints.Comment("select", "nosharding")).Model(&Order{}).Find(&[]Order{}) + assertQueryResult(t, `SELECT /* nosharding */ * FROM "orders"`, tx) +} + +func TestSelect11(t *testing.T) { + tx := db.Clauses(hints.Comment("select", "nosharding")).Model(&Order{}).Where("user_id", 101).Find(&[]Order{}) + assertQueryResult(t, `SELECT /* nosharding */ * FROM "orders" WHERE "user_id" = $1`, tx) +} + +func TestSelect12(t *testing.T) { + tx := db.Raw(`SELECT * FROM "public"."orders" WHERE "user_id" = 101`).Find(&[]Order{}) + assertQueryResult(t, `SELECT * FROM "public"."orders" WHERE "user_id" = 101`, tx) +} + +func TestSelect13(t *testing.T) { + tx := db.Raw("SELECT 1").Find(&[]Order{}) + assertQueryResult(t, `SELECT 1`, tx) +} + +func TestUpdate(t *testing.T) { + tx := db.Model(&Order{}).Where("user_id = ?", 100).Update("product", "new title") + assertQueryResult(t, `UPDATE "orders_004" SET "product" = $1 WHERE "user_id" = $2`, tx) +} + +func TestDelete(t *testing.T) { + tx := db.Where("user_id = ?", 100).Delete(&Order{}) + assertQueryResult(t, `DELETE FROM "orders_004" WHERE "user_id" = $1`, tx) +} + +func TestInsertMissingShardingKey(t *testing.T) { + err := db.Exec(`INSERT INTO "orders" ("id", "product") VALUES(1, 'iPad')`).Error + assert.Equal(t, ErrMissingShardingKey, err) +} + +func TestSelectMissingShardingKey(t *testing.T) { + err := db.Exec(`SELECT * FROM "orders" WHERE "product" = 'iPad'`).Error + assert.Equal(t, ErrMissingShardingKey, err) +} + +func TestSelectNoSharding(t *testing.T) { + err := db.Exec(`SELECT /* nosharding */ * FROM "orders" WHERE "product" = 'iPad'`).Error + assert.Equal(t, nil, err) +} + +func TestNoEq(t *testing.T) { + err := db.Model(&Order{}).Where("user_id <> ?", 101).Find([]Order{}).Error + assert.Equal(t, ErrMissingShardingKey, err) +} + +func TestShardingKeyOK(t *testing.T) { + err := db.Model(&Order{}).Where("user_id = ? and id > ?", 101, int64(100)).Find(&[]Order{}).Error + assert.Equal(t, nil, err) +} + +func TestShardingKeyNotOK(t *testing.T) { + err := db.Model(&Order{}).Where("user_id > ? and id > ?", 101, int64(100)).Find(&[]Order{}).Error + assert.Equal(t, ErrMissingShardingKey, err) +} + +func TestShardingIdOK(t *testing.T) { + err := db.Model(&Order{}).Where("id = ? and user_id > ?", int64(101), 100).Find(&[]Order{}).Error + assert.Equal(t, nil, err) +} + +func TestNoSharding(t *testing.T) { + categories := []Category{} + tx := db.Model(&Category{}).Where("id = ?", 1).Find(&categories) + assertQueryResult(t, `SELECT * FROM "categories" WHERE id = $1`, tx) +} + +func assertQueryResult(t *testing.T, query string, tx *gorm.DB) { + t.Helper() + assert.Equal(t, query, sharding.LastQuery()) +}