vtgateconn

package
v2.0.0-rc.1+incompatible Latest Latest
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 Go to latest Published: Jun 7, 2016 License: BSD-3-Clause Imports: 9 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	// GRPCProtocol is a vtgate protocol based on gRPC
	GRPCProtocol = "grpc"
)

Variables

View Source 
var (
	// VtgateProtocol defines the RPC implementation used for connecting to vtgate.
	VtgateProtocol = flag.String("vtgate_protocol", GRPCProtocol, "how to talk to vtgate")
)

Functions

func RegisterDialer 

func RegisterDialer(name string, dialer DialerFunc)

RegisterDialer is meant to be used by Dialer implementations to self register.

Types

type DialerFunc 

type DialerFunc func(ctx context.Context, address string, timeout time.Duration) (Impl, error)

DialerFunc represents a function that will return a VTGateConn object that can communicate with a VTGate. Keyspace is only used for Execute and StreamExecute calls.

type Impl 

type Impl interface {
	// Execute executes a non-streaming query on vtgate.
	Execute(ctx context.Context, query string, bindVars map[string]interface{}, keyspace string, tabletType topodatapb.TabletType, session interface{}) (*sqltypes.Result, interface{}, error)

	// ExecuteShards executes a non-streaming query for multiple shards on vtgate.
	ExecuteShards(ctx context.Context, query string, keyspace string, shards []string, bindVars map[string]interface{}, tabletType topodatapb.TabletType, session interface{}) (*sqltypes.Result, interface{}, error)

	// ExecuteKeyspaceIds executes a non-streaming query for multiple keyspace_ids.
	ExecuteKeyspaceIds(ctx context.Context, query string, keyspace string, keyspaceIds [][]byte, bindVars map[string]interface{}, tabletType topodatapb.TabletType, session interface{}) (*sqltypes.Result, interface{}, error)

	// ExecuteKeyRanges executes a non-streaming query on a key range.
	ExecuteKeyRanges(ctx context.Context, query string, keyspace string, keyRanges []*topodatapb.KeyRange, bindVars map[string]interface{}, tabletType topodatapb.TabletType, session interface{}) (*sqltypes.Result, interface{}, error)

	// ExecuteEntityIds executes a non-streaming query for multiple entities.
	ExecuteEntityIds(ctx context.Context, query string, keyspace string, entityColumnName string, entityKeyspaceIDs []*vtgatepb.ExecuteEntityIdsRequest_EntityId, bindVars map[string]interface{}, tabletType topodatapb.TabletType, session interface{}) (*sqltypes.Result, interface{}, error)

	// ExecuteBatchShards executes a set of non-streaming queries for multiple shards.
	ExecuteBatchShards(ctx context.Context, queries []*vtgatepb.BoundShardQuery, tabletType topodatapb.TabletType, asTransaction bool, session interface{}) ([]sqltypes.Result, interface{}, error)

	// ExecuteBatchKeyspaceIds executes a set of non-streaming queries for multiple keyspace ids.
	ExecuteBatchKeyspaceIds(ctx context.Context, queries []*vtgatepb.BoundKeyspaceIdQuery, tabletType topodatapb.TabletType, asTransaction bool, session interface{}) ([]sqltypes.Result, interface{}, error)

	// StreamExecute executes a streaming query on vtgate.
	StreamExecute(ctx context.Context, query string, bindVars map[string]interface{}, keyspace string, tabletType topodatapb.TabletType) (sqltypes.ResultStream, error)

	// StreamExecuteShards executes a streaming query on vtgate, on a set of shards.
	StreamExecuteShards(ctx context.Context, query string, keyspace string, shards []string, bindVars map[string]interface{}, tabletType topodatapb.TabletType) (sqltypes.ResultStream, error)

	// StreamExecuteKeyRanges executes a streaming query on vtgate, on a set of keyranges.
	StreamExecuteKeyRanges(ctx context.Context, query string, keyspace string, keyRanges []*topodatapb.KeyRange, bindVars map[string]interface{}, tabletType topodatapb.TabletType) (sqltypes.ResultStream, error)

	// StreamExecuteKeyspaceIds executes a streaming query on vtgate, for the given keyspaceIds.
	StreamExecuteKeyspaceIds(ctx context.Context, query string, keyspace string, keyspaceIds [][]byte, bindVars map[string]interface{}, tabletType topodatapb.TabletType) (sqltypes.ResultStream, error)

	// Begin starts a transaction and returns a VTGateTX.
	Begin(ctx context.Context) (interface{}, error)
	// Commit commits the current transaction.
	Commit(ctx context.Context, session interface{}) error
	// Rollback rolls back the current transaction.
	Rollback(ctx context.Context, session interface{}) error

	// SplitQuery splits a query into equally sized smaller queries by
	// appending primary key range clauses to the original query.
	SplitQuery(ctx context.Context, keyspace string, query string, bindVars map[string]interface{}, splitColumn string, splitCount int64) ([]*vtgatepb.SplitQueryResponse_Part, error)

	// SplitQuery splits a query into smaller queries. It is mostly used by batch job frameworks
	// such as MapReduce. See the documentation for the vtgate.SplitQueryRequest protocol buffer
	// message in 'proto/vtgate.proto'.
	// TODO(erez): Rename to SplitQuery after the migration to SplitQuery V2 is done.
	SplitQueryV2(
		ctx context.Context,
		keyspace string,
		query string,
		bindVars map[string]interface{},
		splitColumns []string,
		splitCount int64,
		numRowsPerQueryPart int64,
		algorithm querypb.SplitQueryRequest_Algorithm) ([]*vtgatepb.SplitQueryResponse_Part, error)

	// GetSrvKeyspace returns a topo.SrvKeyspace.
	GetSrvKeyspace(ctx context.Context, keyspace string) (*topodatapb.SrvKeyspace, error)

	// Close must be called for releasing resources.
	Close()
}

Impl defines the interface for a vtgate client protocol implementation. It can be used concurrently across goroutines.

type VTGateConn 

type VTGateConn struct {
	// contains filtered or unexported fields
}

VTGateConn is the client API object to talk to vtgate. It is constructed using the Dial method. It can be used concurrently across goroutines.

func Dial 

func Dial(ctx context.Context, address string, timeout time.Duration, keyspace string) (*VTGateConn, error)

Dial dials using the command-line specified protocol, and returns the *VTGateConn.

func DialProtocol 

func DialProtocol(ctx context.Context, protocol string, address string, timeout time.Duration, keyspace string) (*VTGateConn, error)

DialProtocol dials a specific protocol, and returns the *VTGateConn

func (*VTGateConn) Begin 

func (conn *VTGateConn) Begin(ctx context.Context) (*VTGateTx, error)

Begin starts a transaction and returns a VTGateTX.

func (*VTGateConn) Close 

func (conn *VTGateConn) Close()

Close must be called for releasing resources.

func (*VTGateConn) Execute 

func (conn *VTGateConn) Execute(ctx context.Context, query string, bindVars map[string]interface{}, tabletType topodatapb.TabletType) (*sqltypes.Result, error)

Execute executes a non-streaming query on vtgate. This is using v3 API.

func (*VTGateConn) ExecuteBatchKeyspaceIds 

func (conn *VTGateConn) ExecuteBatchKeyspaceIds(ctx context.Context, queries []*vtgatepb.BoundKeyspaceIdQuery, tabletType topodatapb.TabletType, asTransaction bool) ([]sqltypes.Result, error)

ExecuteBatchKeyspaceIds executes a set of non-streaming queries for multiple keyspace ids. If "asTransaction" is true, vtgate will automatically create a transaction (per shard) that encloses all the batch queries.

func (*VTGateConn) ExecuteBatchShards 

func (conn *VTGateConn) ExecuteBatchShards(ctx context.Context, queries []*vtgatepb.BoundShardQuery, tabletType topodatapb.TabletType, asTransaction bool) ([]sqltypes.Result, error)

ExecuteBatchShards executes a set of non-streaming queries for multiple shards. If "asTransaction" is true, vtgate will automatically create a transaction (per shard) that encloses all the batch queries.

func (*VTGateConn) ExecuteEntityIds 

func (conn *VTGateConn) ExecuteEntityIds(ctx context.Context, query string, keyspace string, entityColumnName string, entityKeyspaceIDs []*vtgatepb.ExecuteEntityIdsRequest_EntityId, bindVars map[string]interface{}, tabletType topodatapb.TabletType) (*sqltypes.Result, error)

ExecuteEntityIds executes a non-streaming query for multiple entities.

func (*VTGateConn) ExecuteKeyRanges 

func (conn *VTGateConn) ExecuteKeyRanges(ctx context.Context, query string, keyspace string, keyRanges []*topodatapb.KeyRange, bindVars map[string]interface{}, tabletType topodatapb.TabletType) (*sqltypes.Result, error)

ExecuteKeyRanges executes a non-streaming query on a key range.

func (*VTGateConn) ExecuteKeyspaceIds 

func (conn *VTGateConn) ExecuteKeyspaceIds(ctx context.Context, query string, keyspace string, keyspaceIds [][]byte, bindVars map[string]interface{}, tabletType topodatapb.TabletType) (*sqltypes.Result, error)

ExecuteKeyspaceIds executes a non-streaming query for multiple keyspace_ids.

func (*VTGateConn) ExecuteShards 

func (conn *VTGateConn) ExecuteShards(ctx context.Context, query string, keyspace string, shards []string, bindVars map[string]interface{}, tabletType topodatapb.TabletType) (*sqltypes.Result, error)

ExecuteShards executes a non-streaming query for multiple shards on vtgate.

func (*VTGateConn) GetSrvKeyspace 

func (conn *VTGateConn) GetSrvKeyspace(ctx context.Context, keyspace string) (*topodatapb.SrvKeyspace, error)

GetSrvKeyspace returns a topo.SrvKeyspace object.

func (*VTGateConn) SplitQuery 

func (conn *VTGateConn) SplitQuery(ctx context.Context, keyspace string, query string, bindVars map[string]interface{}, splitColumn string, splitCount int64) ([]*vtgatepb.SplitQueryResponse_Part, error)

SplitQuery splits a query into equally sized smaller queries by appending primary key range clauses to the original query

func (*VTGateConn) SplitQueryV2 

func (conn *VTGateConn) SplitQueryV2(
	ctx context.Context,
	keyspace string,
	query string,
	bindVars map[string]interface{},
	splitColumns []string,
	splitCount int64,
	numRowsPerQueryPart int64,
	algorithm querypb.SplitQueryRequest_Algorithm,
) ([]*vtgatepb.SplitQueryResponse_Part, error)

SplitQueryV2 splits a query into smaller queries. It is mostly used by batch job frameworks such as MapReduce. See the documentation for the vtgate.SplitQueryRequest protocol buffer message in 'proto/vtgate.proto'. TODO(erez): Rename to SplitQuery after the migration to SplitQuery V2 is done.

func (*VTGateConn) StreamExecute 

func (conn *VTGateConn) StreamExecute(ctx context.Context, query string, bindVars map[string]interface{}, tabletType topodatapb.TabletType) (sqltypes.ResultStream, error)

StreamExecute executes a streaming query on vtgate. It returns a ResultStream and an error. First check the error. Then you can pull values from the ResultStream until io.EOF, or another error.

func (*VTGateConn) StreamExecuteKeyRanges 

func (conn *VTGateConn) StreamExecuteKeyRanges(ctx context.Context, query string, keyspace string, keyRanges []*topodatapb.KeyRange, bindVars map[string]interface{}, tabletType topodatapb.TabletType) (sqltypes.ResultStream, error)

StreamExecuteKeyRanges executes a streaming query on vtgate, on a set of keyranges. It returns a ResultStream and an error. First check the error. Then you can pull values from the ResultStream until io.EOF, or another error.

func (*VTGateConn) StreamExecuteKeyspaceIds 

func (conn *VTGateConn) StreamExecuteKeyspaceIds(ctx context.Context, query string, keyspace string, keyspaceIds [][]byte, bindVars map[string]interface{}, tabletType topodatapb.TabletType) (sqltypes.ResultStream, error)

StreamExecuteKeyspaceIds executes a streaming query on vtgate, for the given keyspaceIds. It returns a ResultStream and an error. First check the error. Then you can pull values from the ResultStream until io.EOF, or another error.

func (*VTGateConn) StreamExecuteShards 

func (conn *VTGateConn) StreamExecuteShards(ctx context.Context, query string, keyspace string, shards []string, bindVars map[string]interface{}, tabletType topodatapb.TabletType) (sqltypes.ResultStream, error)

StreamExecuteShards executes a streaming query on vtgate, on a set of shards. It returns a ResultStream and an error. First check the error. Then you can pull values from the ResultStream until io.EOF, or another error.

type VTGateTx 

type VTGateTx struct {
	// contains filtered or unexported fields
}

VTGateTx defines an ongoing transaction. It should not be concurrently used across goroutines.

func (*VTGateTx) Commit 

func (tx *VTGateTx) Commit(ctx context.Context) error

Commit commits the current transaction.

func (*VTGateTx) Execute 

func (tx *VTGateTx) Execute(ctx context.Context, query string, bindVars map[string]interface{}, tabletType topodatapb.TabletType) (*sqltypes.Result, error)

Execute executes a query on vtgate within the current transaction.

func (*VTGateTx) ExecuteBatchKeyspaceIds 

func (tx *VTGateTx) ExecuteBatchKeyspaceIds(ctx context.Context, queries []*vtgatepb.BoundKeyspaceIdQuery, tabletType topodatapb.TabletType) ([]sqltypes.Result, error)

ExecuteBatchKeyspaceIds executes a set of non-streaming queries for multiple keyspace ids.

func (*VTGateTx) ExecuteBatchShards 

func (tx *VTGateTx) ExecuteBatchShards(ctx context.Context, queries []*vtgatepb.BoundShardQuery, tabletType topodatapb.TabletType) ([]sqltypes.Result, error)

ExecuteBatchShards executes a set of non-streaming queries for multiple shards.

func (*VTGateTx) ExecuteEntityIds 

func (tx *VTGateTx) ExecuteEntityIds(ctx context.Context, query string, keyspace string, entityColumnName string, entityKeyspaceIDs []*vtgatepb.ExecuteEntityIdsRequest_EntityId, bindVars map[string]interface{}, tabletType topodatapb.TabletType) (*sqltypes.Result, error)

ExecuteEntityIds executes a non-streaming query for multiple entities.

func (*VTGateTx) ExecuteKeyRanges 

func (tx *VTGateTx) ExecuteKeyRanges(ctx context.Context, query string, keyspace string, keyRanges []*topodatapb.KeyRange, bindVars map[string]interface{}, tabletType topodatapb.TabletType) (*sqltypes.Result, error)

ExecuteKeyRanges executes a non-streaming query on a key range.

func (*VTGateTx) ExecuteKeyspaceIds 

func (tx *VTGateTx) ExecuteKeyspaceIds(ctx context.Context, query string, keyspace string, keyspaceIds [][]byte, bindVars map[string]interface{}, tabletType topodatapb.TabletType) (*sqltypes.Result, error)

ExecuteKeyspaceIds executes a non-streaming query for multiple keyspace_ids.

func (*VTGateTx) ExecuteShards 

func (tx *VTGateTx) ExecuteShards(ctx context.Context, query string, keyspace string, shards []string, bindVars map[string]interface{}, tabletType topodatapb.TabletType) (*sqltypes.Result, error)

ExecuteShards executes a query for multiple shards on vtgate within the current transaction.

func (*VTGateTx) Rollback 

func (tx *VTGateTx) Rollback(ctx context.Context) error

Rollback rolls back the current transaction.

Source Files

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