api: add separate types for constants

Closes #158

Author: oleg-jukovec

CHANGELOG.md

@@ -15,6 +15,7 @@ Versioning](http://semver.org/spec/v2.0.0.html) except to the first release.
 - Support CRUD API (#108)
 - An ability to replace a base network connection to a Tarantool
   instance (#265)
+- Enumeration types for RLimitAction/iterators (#158)
 
 ### Changed
 

connection.go

@@ -231,6 +231,19 @@ type connShard struct {
 	enc             *msgpack.Encoder
 }
 
+// RLimitActions is an enumeration type for an action to do when a rate limit
+// is reached.
+type RLimitAction int
+
+const (
+	// RLimitDrop immediately aborts the request.
+	RLimitDrop RLimitAction = iota
+	// RLimitWait waits during timeout period for some request to be answered.
+	// If no request answered during timeout period, this request is aborted.
+	// If no timeout period is set, it will wait forever.
+	RLimitWait
+)
+
 // Opts is a way to configure Connection
 type Opts struct {
 	// Auth is an authentication method.
@@ -269,14 +282,9 @@ type Opts struct {
 	// It is disabled by default.
 	// See RLimitAction for possible actions when RateLimit.reached.
 	RateLimit uint
-	// RLimitAction tells what to do when RateLimit reached:
-	//   RLimitDrop - immediately abort request,
-	//   RLimitWait - wait during timeout period for some request to be answered.
-	//                If no request answered during timeout period, this request
-	//                is aborted.
-	//                If no timeout period is set, it will wait forever.
+	// RLimitAction tells what to do when RateLimit is reached.
 	// It is required if RateLimit is specified.
-	RLimitAction uint
+	RLimitAction RLimitAction
 	// Concurrency is amount of separate mutexes for request
 	// queues and buffers inside of connection.
 	// It is rounded up to nearest power of 2.

connector.go

@@ -8,7 +8,7 @@ type Connector interface {
 	Ping() (resp *Response, err error)
 	ConfiguredTimeout() time.Duration
 
-	Select(space, index interface{}, offset, limit, iterator uint32, key interface{}) (resp *Response, err error)
+	Select(space, index interface{}, offset, limit uint32, iterator Iter, key interface{}) (resp *Response, err error)
 	Insert(space interface{}, tuple interface{}) (resp *Response, err error)
 	Replace(space interface{}, tuple interface{}) (resp *Response, err error)
 	Delete(space, index interface{}, key interface{}) (resp *Response, err error)
@@ -21,7 +21,7 @@ type Connector interface {
 	Execute(expr string, args interface{}) (resp *Response, err error)
 
 	GetTyped(space, index interface{}, key interface{}, result interface{}) (err error)
-	SelectTyped(space, index interface{}, offset, limit, iterator uint32, key interface{}, result interface{}) (err error)
+	SelectTyped(space, index interface{}, offset, limit uint32, iterator Iter, key interface{}, result interface{}) (err error)
 	InsertTyped(space interface{}, tuple interface{}, result interface{}) (err error)
 	ReplaceTyped(space interface{}, tuple interface{}, result interface{}) (err error)
 	DeleteTyped(space, index interface{}, key interface{}, result interface{}) (err error)
@@ -32,7 +32,7 @@ type Connector interface {
 	EvalTyped(expr string, args interface{}, result interface{}) (err error)
 	ExecuteTyped(expr string, args interface{}, result interface{}) (SQLInfo, []ColumnMetaData, error)
 
-	SelectAsync(space, index interface{}, offset, limit, iterator uint32, key interface{}) *Future
+	SelectAsync(space, index interface{}, offset, limit uint32, iterator Iter, key interface{}) *Future
 	InsertAsync(space interface{}, tuple interface{}) *Future
 	ReplaceAsync(space interface{}, tuple interface{}) *Future
 	DeleteAsync(space, index interface{}, key interface{}) *Future

const.go

@@ -5,20 +5,6 @@ const (
 )
 
 const (
-	IterEq            = uint32(0) // key == x ASC order
-	IterReq           = uint32(1) // key == x DESC order
-	IterAll           = uint32(2) // all tuples
-	IterLt            = uint32(3) // key < x
-	IterLe            = uint32(4) // key <= x
-	IterGe            = uint32(5) // key >= x
-	IterGt            = uint32(6) // key > x
-	IterBitsAllSet    = uint32(7) // all bits from x are set in key
-	IterBitsAnySet    = uint32(8) // at least one x's bit is set
-	IterBitsAllNotSet = uint32(9) // all bits are not set
-
-	RLimitDrop = 1
-	RLimitWait = 2
-
 	OkCode   = uint32(0)
 	PushCode = uint32(0x80)
 )

export_test.go

@@ -24,7 +24,7 @@ func RefImplPingBody(enc *msgpack.Encoder) error {
 
 // RefImplSelectBody is reference implementation for filling of a select
 // request's body.
-func RefImplSelectBody(enc *msgpack.Encoder, space, index, offset, limit, iterator uint32,
+func RefImplSelectBody(enc *msgpack.Encoder, space, index, offset, limit uint32, iterator Iter,
 	key, after interface{}, fetchPos bool) error {
 	return fillSelect(enc, space, index, offset, limit, iterator, key, after, fetchPos)
 }

iterator.go

@@ -0,0 +1,17 @@
+package tarantool
+
+// Iter is an enumeration type of a select iterator.
+type Iter uint32
+
+const (
+	IterEq            Iter = 0 // key == x ASC order
+	IterReq           Iter = 1 // key == x DESC order
+	IterAll           Iter = 2 // all tuples
+	IterLt            Iter = 3 // key < x
+	IterLe            Iter = 4 // key <= x
+	IterGe            Iter = 5 // key >= x
+	IterGt            Iter = 6 // key > x
+	IterBitsAllSet    Iter = 7 // all bits from x are set in key
+	IterBitsAnySet    Iter = 8 // at least one x's bit is set
+	IterBitsAllNotSet Iter = 9 // all bits are not set
+)

pool/connection_pool.go

@@ -281,7 +281,9 @@ func (connPool *ConnectionPool) Ping(userMode Mode) (*tarantool.Response, error)
 }
 
 // Select performs select to box space.
-func (connPool *ConnectionPool) Select(space, index interface{}, offset, limit, iterator uint32, key interface{}, userMode ...Mode) (resp *tarantool.Response, err error) {
+func (connPool *ConnectionPool) Select(space, index interface{},
+	offset, limit uint32,
+	iterator tarantool.Iter, key interface{}, userMode ...Mode) (resp *tarantool.Response, err error) {
 	conn, err := connPool.getConnByMode(ANY, userMode)
 	if err != nil {
 		return nil, err
@@ -413,7 +415,9 @@ func (connPool *ConnectionPool) GetTyped(space, index interface{}, key interface
 }
 
 // SelectTyped performs select to box space and fills typed result.
-func (connPool *ConnectionPool) SelectTyped(space, index interface{}, offset, limit, iterator uint32, key interface{}, result interface{}, userMode ...Mode) (err error) {
+func (connPool *ConnectionPool) SelectTyped(space, index interface{},
+	offset, limit uint32,
+	iterator tarantool.Iter, key interface{}, result interface{}, userMode ...Mode) (err error) {
 	conn, err := connPool.getConnByMode(ANY, userMode)
 	if err != nil {
 		return err
@@ -521,7 +525,9 @@ func (connPool *ConnectionPool) ExecuteTyped(expr string, args interface{}, resu
 }
 
 // SelectAsync sends select request to Tarantool and returns Future.
-func (connPool *ConnectionPool) SelectAsync(space, index interface{}, offset, limit, iterator uint32, key interface{}, userMode ...Mode) *tarantool.Future {
+func (connPool *ConnectionPool) SelectAsync(space, index interface{},
+	offset, limit uint32,
+	iterator tarantool.Iter, key interface{}, userMode ...Mode) *tarantool.Future {
 	conn, err := connPool.getConnByMode(ANY, userMode)
 	if err != nil {
 		return newErrorFuture(err)

pool/connector.go

@@ -63,7 +63,7 @@ func (c *ConnectorAdapter) ConfiguredTimeout() time.Duration {
 
 // Select performs select to box space.
 func (c *ConnectorAdapter) Select(space, index interface{},
-	offset, limit, iterator uint32,
+	offset, limit uint32, iterator tarantool.Iter,
 	key interface{}) (*tarantool.Response, error) {
 	return c.pool.Select(space, index, offset, limit, iterator, key, c.mode)
 }
@@ -143,7 +143,7 @@ func (c *ConnectorAdapter) GetTyped(space, index interface{},
 
 // SelectTyped performs select to box space and fills typed result.
 func (c *ConnectorAdapter) SelectTyped(space, index interface{},
-	offset, limit, iterator uint32,
+	offset, limit uint32, iterator tarantool.Iter,
 	key interface{}, result interface{}) error {
 	return c.pool.SelectTyped(space, index, offset, limit, iterator, key, result, c.mode)
 }
@@ -210,7 +210,7 @@ func (c *ConnectorAdapter) ExecuteTyped(expr string, args interface{},
 
 // SelectAsync sends select request to Tarantool and returns Future.
 func (c *ConnectorAdapter) SelectAsync(space, index interface{},
-	offset, limit, iterator uint32, key interface{}) *tarantool.Future {
+	offset, limit uint32, iterator tarantool.Iter, key interface{}) *tarantool.Future {
 	return c.pool.SelectAsync(space, index, offset, limit, iterator, key, c.mode)
 }
 

pool/pooler.go

@@ -13,7 +13,7 @@ type Pooler interface {
 	Ping(mode Mode) (*tarantool.Response, error)
 	ConfiguredTimeout(mode Mode) (time.Duration, error)
 
-	Select(space, index interface{}, offset, limit, iterator uint32,
+	Select(space, index interface{}, offset, limit uint32, iterator tarantool.Iter,
 		key interface{}, mode ...Mode) (*tarantool.Response, error)
 	Insert(space interface{}, tuple interface{},
 		mode ...Mode) (*tarantool.Response, error)
@@ -38,7 +38,7 @@ type Pooler interface {
 
 	GetTyped(space, index interface{}, key interface{}, result interface{},
 		mode ...Mode) error
-	SelectTyped(space, index interface{}, offset, limit, iterator uint32,
+	SelectTyped(space, index interface{}, offset, limit uint32, iterator tarantool.Iter,
 		key interface{}, result interface{}, mode ...Mode) error
 	InsertTyped(space interface{}, tuple interface{}, result interface{},
 		mode ...Mode) error
@@ -59,7 +59,7 @@ type Pooler interface {
 	ExecuteTyped(expr string, args interface{}, result interface{},
 		mode Mode) (tarantool.SQLInfo, []tarantool.ColumnMetaData, error)
 
-	SelectAsync(space, index interface{}, offset, limit, iterator uint32,
+	SelectAsync(space, index interface{}, offset, limit uint32, iterator tarantool.Iter,
 		key interface{}, mode ...Mode) *tarantool.Future
 	InsertAsync(space interface{}, tuple interface{},
 		mode ...Mode) *tarantool.Future

request.go

@@ -31,7 +31,7 @@ func fillSearch(enc *msgpack.Encoder, spaceNo, indexNo uint32, key interface{})
 	return enc.Encode(key)
 }
 
-func fillIterator(enc *msgpack.Encoder, offset, limit, iterator uint32) error {
+func fillIterator(enc *msgpack.Encoder, offset, limit uint32, iterator Iter) error {
 	if err := enc.EncodeUint(uint64(iproto.IPROTO_ITERATOR)); err != nil {
 		return err
 	}
@@ -66,7 +66,7 @@ func fillInsert(enc *msgpack.Encoder, spaceNo uint32, tuple interface{}) error {
 	return enc.Encode(tuple)
 }
 
-func fillSelect(enc *msgpack.Encoder, spaceNo, indexNo, offset, limit, iterator uint32,
+func fillSelect(enc *msgpack.Encoder, spaceNo, indexNo, offset, limit uint32, iterator Iter,
 	key, after interface{}, fetchPos bool) error {
 	mapLen := 6
 	if fetchPos {
@@ -174,7 +174,7 @@ func (conn *Connection) Ping() (resp *Response, err error) {
 // Select performs select to box space.
 //
 // It is equal to conn.SelectAsync(...).Get().
-func (conn *Connection) Select(space, index interface{}, offset, limit, iterator uint32, key interface{}) (resp *Response, err error) {
+func (conn *Connection) Select(space, index interface{}, offset, limit uint32, iterator Iter, key interface{}) (resp *Response, err error) {
 	return conn.SelectAsync(space, index, offset, limit, iterator, key).Get()
 }
 
@@ -294,7 +294,7 @@ func (conn *Connection) GetTyped(space, index interface{}, key interface{}, resu
 // SelectTyped performs select to box space and fills typed result.
 //
 // It is equal to conn.SelectAsync(space, index, offset, limit, iterator, key).GetTyped(&result)
-func (conn *Connection) SelectTyped(space, index interface{}, offset, limit, iterator uint32, key interface{}, result interface{}) (err error) {
+func (conn *Connection) SelectTyped(space, index interface{}, offset, limit uint32, iterator Iter, key interface{}, result interface{}) (err error) {
 	return conn.SelectAsync(space, index, offset, limit, iterator, key).GetTyped(result)
 }
 
@@ -373,7 +373,7 @@ func (conn *Connection) ExecuteTyped(expr string, args interface{}, result inter
 }
 
 // SelectAsync sends select request to Tarantool and returns Future.
-func (conn *Connection) SelectAsync(space, index interface{}, offset, limit, iterator uint32, key interface{}) *Future {
+func (conn *Connection) SelectAsync(space, index interface{}, offset, limit uint32, iterator Iter, key interface{}) *Future {
 	req := NewSelectRequest(space).
 		Index(index).
 		Offset(offset).
@@ -746,7 +746,8 @@ func (req *PingRequest) Context(ctx context.Context) *PingRequest {
 type SelectRequest struct {
 	spaceIndexRequest
 	isIteratorSet, fetchPos bool
-	offset, limit, iterator uint32
+	offset, limit           uint32
+	iterator                Iter
 	key, after              interface{}
 }
 
@@ -787,7 +788,7 @@ func (req *SelectRequest) Limit(limit uint32) *SelectRequest {
 
 // Iterator set the iterator for the select request.
 // Note: default value is IterAll if key is not set or IterEq otherwise.
-func (req *SelectRequest) Iterator(iterator uint32) *SelectRequest {
+func (req *SelectRequest) Iterator(iterator Iter) *SelectRequest {
 	req.iterator = iterator
 	req.isIteratorSet = true
 	return req