api: add ConnectorAdapter to connection_pool

ConnectorAdapter allows to use ConnectionPool as Connector. All
requests to a pool will be executed in a specified mode.

Part of #176

Author: oleg-jukovec

CHANGELOG.md

@@ -14,6 +14,7 @@ Versioning](http://semver.org/spec/v2.0.0.html) except to the first release.
 - ConnectionListener interface for knowing the role changes of connections in
   ConnectionPool (#178)
 - Execute, ExecuteTyped and ExecuteAsync methods to ConnectionPool (#176)
+- ConnectorAdapter type to use ConnectionPool as Connector interface (#176)
 
 ### Changed
 

connection_pool/connection_pool.go

@@ -92,6 +92,7 @@ type ConnectionPool struct {
 	anyPool    *RoundRobinStrategy
 	poolsMutex sync.RWMutex
 }
+var _ Pooler = (*ConnectionPool)(nil)
 
 type connState struct {
 	addr   string

connection_pool/connector.go

@@ -0,0 +1,305 @@
+package connection_pool
+
+import (
+	"errors"
+	"fmt"
+	"time"
+
+	"github.com/tarantool/go-tarantool"
+)
+
+// ConnectorAdapter allows to use Pooler as Connector.
+type ConnectorAdapter struct {
+	pool Pooler
+	mode Mode
+}
+
+var _ tarantool.Connector = (*ConnectorAdapter)(nil)
+
+// NewConnectorAdapter creates a new ConnectorAdapter object for a pool
+// and with a mode. All requests to the pool will be executed in the
+// specified mode.
+func NewConnectorAdapter(pool Pooler, mode Mode) *ConnectorAdapter {
+	return &ConnectorAdapter{pool: pool, mode: mode}
+}
+
+// ConnectedNow reports if connections is established at the moment.
+func (c *ConnectorAdapter) ConnectedNow() bool {
+	ret, err := c.pool.ConnectedNow(c.mode)
+	if err != nil {
+		return false
+	}
+	return ret
+}
+
+// ClosedNow reports if the connector is closed by user or all connections
+// in the specified mode closed.
+func (c *ConnectorAdapter) Close() error {
+	errs := c.pool.Close()
+	if len(errs) == 0 {
+		return nil
+	}
+
+	err := errors.New("failed to close connection pool")
+	for _, e := range errs {
+		err = fmt.Errorf("%s: %w", err.Error(), e)
+	}
+	return err
+}
+
+// Ping sends empty request to Tarantool to check connection.
+func (c *ConnectorAdapter) Ping() (*tarantool.Response, error) {
+	return c.pool.Ping(c.mode)
+}
+
+// ConfiguredTimeout returns a timeout from connections config.
+func (c *ConnectorAdapter) ConfiguredTimeout() time.Duration {
+	ret, err := c.pool.ConfiguredTimeout(c.mode)
+	if err != nil {
+		return 0 * time.Second
+	}
+	return ret
+}
+
+// Select performs select to box space.
+func (c *ConnectorAdapter) Select(space, index interface{},
+	offset, limit, iterator uint32,
+	key interface{}) (*tarantool.Response, error) {
+	return c.pool.Select(space, index, offset, limit, iterator, key, c.mode)
+}
+
+// Insert performs insertion to box space.
+func (c *ConnectorAdapter) Insert(space interface{},
+	tuple interface{}) (*tarantool.Response, error) {
+	return c.pool.Insert(space, tuple, c.mode)
+}
+
+// Replace performs "insert or replace" action to box space.
+func (c *ConnectorAdapter) Replace(space interface{},
+	tuple interface{}) (*tarantool.Response, error) {
+	return c.pool.Replace(space, tuple, c.mode)
+}
+
+// Delete performs deletion of a tuple by key.
+func (c *ConnectorAdapter) Delete(space, index interface{},
+	key interface{}) (*tarantool.Response, error) {
+	return c.pool.Delete(space, index, key, c.mode)
+}
+
+// Update performs update of a tuple by key.
+func (c *ConnectorAdapter) Update(space, index interface{},
+	key, ops interface{}) (*tarantool.Response, error) {
+	return c.pool.Update(space, index, key, ops, c.mode)
+}
+
+// Upsert performs "update or insert" action of a tuple by key.
+func (c *ConnectorAdapter) Upsert(space interface{},
+	tuple, ops interface{}) (*tarantool.Response, error) {
+	return c.pool.Upsert(space, tuple, ops, c.mode)
+}
+
+// Call calls registered Tarantool function.
+// It uses request code for Tarantool >= 1.7 if go-tarantool
+// was build with go_tarantool_call_17 tag.
+// Otherwise, uses request code for Tarantool 1.6.
+func (c *ConnectorAdapter) Call(functionName string,
+	args interface{}) (*tarantool.Response, error) {
+	return c.pool.Call(functionName, args, c.mode)
+}
+
+// Call16 calls registered Tarantool function.
+// It uses request code for Tarantool 1.6, so result is converted to array of arrays
+// Deprecated since Tarantool 1.7.2.
+func (c *ConnectorAdapter) Call16(functionName string,
+	args interface{}) (*tarantool.Response, error) {
+	return c.pool.Call16(functionName, args, c.mode)
+}
+
+// Call17 calls registered Tarantool function.
+// It uses request code for Tarantool >= 1.7, so result is not converted
+// (though, keep in mind, result is always array)
+func (c *ConnectorAdapter) Call17(functionName string,
+	args interface{}) (*tarantool.Response, error) {
+	return c.pool.Call17(functionName, args, c.mode)
+}
+
+// Eval passes Lua expression for evaluation.
+func (c *ConnectorAdapter) Eval(expr string,
+	args interface{}) (*tarantool.Response, error) {
+	return c.pool.Eval(expr, args, c.mode)
+}
+
+// Execute passes sql expression to Tarantool for execution.
+func (c *ConnectorAdapter) Execute(expr string,
+	args interface{}) (*tarantool.Response, error) {
+	return c.pool.Execute(expr, args, c.mode)
+}
+
+// GetTyped performs select (with limit = 1 and offset = 0)
+// to box space and fills typed result.
+func (c *ConnectorAdapter) GetTyped(space, index interface{},
+	key interface{}, result interface{}) error {
+	return c.pool.GetTyped(space, index, key, result, c.mode)
+}
+
+// SelectTyped performs select to box space and fills typed result.
+func (c *ConnectorAdapter) SelectTyped(space, index interface{},
+	offset, limit, iterator uint32,
+	key interface{}, result interface{}) error {
+	return c.pool.SelectTyped(space, index, offset, limit, iterator, key, result, c.mode)
+}
+
+// InsertTyped performs insertion to box space.
+func (c *ConnectorAdapter) InsertTyped(space interface{},
+	tuple interface{}, result interface{}) error {
+	return c.pool.InsertTyped(space, tuple, result, c.mode)
+}
+
+// ReplaceTyped performs "insert or replace" action to box space.
+func (c *ConnectorAdapter) ReplaceTyped(space interface{},
+	tuple interface{}, result interface{}) error {
+	return c.pool.ReplaceTyped(space, tuple, result, c.mode)
+}
+
+// DeleteTyped performs deletion of a tuple by key and fills result with deleted tuple.
+func (c *ConnectorAdapter) DeleteTyped(space, index interface{},
+	key interface{}, result interface{}) error {
+	return c.pool.DeleteTyped(space, index, key, result, c.mode)
+}
+
+// UpdateTyped performs update of a tuple by key and fills result with updated tuple.
+func (c *ConnectorAdapter) UpdateTyped(space, index interface{},
+	key, ops interface{}, result interface{}) error {
+	return c.pool.UpdateTyped(space, index, key, ops, result, c.mode)
+}
+
+// CallTyped calls registered function.
+// It uses request code for Tarantool >= 1.7 if go-tarantool
+// was build with go_tarantool_call_17 tag.
+// Otherwise, uses request code for Tarantool 1.6.
+func (c *ConnectorAdapter) CallTyped(functionName string,
+	args interface{}, result interface{}) error {
+	return c.pool.CallTyped(functionName, args, result, c.mode)
+}
+
+// Call16Typed calls registered function.
+// It uses request code for Tarantool 1.6, so result is converted to array of arrays
+// Deprecated since Tarantool 1.7.2.
+func (c *ConnectorAdapter) Call16Typed(functionName string,
+	args interface{}, result interface{}) error {
+	return c.pool.Call16Typed(functionName, args, result, c.mode)
+}
+
+// Call17Typed calls registered function.
+// It uses request code for Tarantool >= 1.7, so result is not converted
+// (though, keep in mind, result is always array)
+func (c *ConnectorAdapter) Call17Typed(functionName string,
+	args interface{}, result interface{}) error {
+	return c.pool.Call17Typed(functionName, args, result, c.mode)
+}
+
+// EvalTyped passes Lua expression for evaluation.
+func (c *ConnectorAdapter) EvalTyped(expr string, args interface{},
+	result interface{}) error {
+	return c.pool.EvalTyped(expr, args, result, c.mode)
+}
+
+// ExecuteTyped passes sql expression to Tarantool for execution.
+func (c *ConnectorAdapter) ExecuteTyped(expr string, args interface{},
+	result interface{}) (tarantool.SQLInfo, []tarantool.ColumnMetaData, error) {
+	return c.pool.ExecuteTyped(expr, args, result, c.mode)
+}
+
+// SelectAsync sends select request to Tarantool and returns Future.
+func (c *ConnectorAdapter) SelectAsync(space, index interface{},
+	offset, limit, iterator uint32, key interface{}) *tarantool.Future {
+	return c.pool.SelectAsync(space, index, offset, limit, iterator, key, c.mode)
+}
+
+// InsertAsync sends insert action to Tarantool and returns Future.
+func (c *ConnectorAdapter) InsertAsync(space interface{},
+	tuple interface{}) *tarantool.Future {
+	return c.pool.InsertAsync(space, tuple, c.mode)
+}
+
+// ReplaceAsync sends "insert or replace" action to Tarantool and returns Future.
+func (c *ConnectorAdapter) ReplaceAsync(space interface{},
+	tuple interface{}) *tarantool.Future {
+	return c.pool.ReplaceAsync(space, tuple, c.mode)
+}
+
+// DeleteAsync sends deletion action to Tarantool and returns Future.
+func (c *ConnectorAdapter) DeleteAsync(space, index interface{},
+	key interface{}) *tarantool.Future {
+	return c.pool.DeleteAsync(space, index, key, c.mode)
+}
+
+// Update sends deletion of a tuple by key and returns Future.
+func (c *ConnectorAdapter) UpdateAsync(space, index interface{},
+	key, ops interface{}) *tarantool.Future {
+	return c.pool.UpdateAsync(space, index, key, ops, c.mode)
+}
+
+// UpsertAsync sends "update or insert" action to Tarantool and returns Future.
+func (c *ConnectorAdapter) UpsertAsync(space interface{}, tuple interface{},
+	ops interface{}) *tarantool.Future {
+	return c.pool.UpsertAsync(space, tuple, ops, c.mode)
+}
+
+// CallAsync sends a call to registered Tarantool function and returns Future.
+// It uses request code for Tarantool >= 1.7 if go-tarantool
+// was build with go_tarantool_call_17 tag.
+// Otherwise, uses request code for Tarantool 1.6.
+func (c *ConnectorAdapter) CallAsync(functionName string,
+	args interface{}) *tarantool.Future {
+	return c.pool.CallAsync(functionName, args, c.mode)
+}
+
+// Call16Async sends a call to registered Tarantool function and returns Future.
+// It uses request code for Tarantool 1.6, so future's result is always array of arrays.
+// Deprecated since Tarantool 1.7.2.
+func (c *ConnectorAdapter) Call16Async(functionName string,
+	args interface{}) *tarantool.Future {
+	return c.pool.Call16Async(functionName, args, c.mode)
+}
+
+// Call17Async sends a call to registered Tarantool function and returns Future.
+// It uses request code for Tarantool >= 1.7, so future's result will not be converted
+// (though, keep in mind, result is always array)
+func (c *ConnectorAdapter) Call17Async(functionName string,
+	args interface{}) *tarantool.Future {
+	return c.pool.Call17Async(functionName, args, c.mode)
+}
+
+// EvalAsync sends a Lua expression for evaluation and returns Future.
+func (c *ConnectorAdapter) EvalAsync(expr string,
+	args interface{}) *tarantool.Future {
+	return c.pool.EvalAsync(expr, args, c.mode)
+}
+
+// ExecuteAsync sends a sql expression for execution and returns Future.
+func (c *ConnectorAdapter) ExecuteAsync(expr string,
+	args interface{}) *tarantool.Future {
+	return c.pool.ExecuteAsync(expr, args, c.mode)
+}
+
+// NewPrepared passes a sql statement to Tarantool for preparation
+// synchronously.
+func (c *ConnectorAdapter) NewPrepared(expr string) (*tarantool.Prepared, error) {
+	return c.pool.NewPrepared(expr, c.mode)
+}
+
+// NewStream creates new Stream object for connection.
+//
+// Since v. 2.10.0, Tarantool supports streams and interactive transactions over
+// them. To use interactive transactions, memtx_use_mvcc_engine box option
+// should be set to true.
+// Since 1.7.0
+func (c *ConnectorAdapter) NewStream() (*tarantool.Stream, error) {
+	return c.pool.NewStream(c.mode)
+}
+
+// Do performs a request asynchronously on the connection.
+func (c *ConnectorAdapter) Do(req tarantool.Request) *tarantool.Future {
+	return c.pool.Do(req, c.mode)
+}