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query_executor.go
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/
query_executor.go
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// Copyright 2014, Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package vtgate
import (
"sort"
"golang.org/x/net/context"
"github.com/youtube/vitess/go/sqltypes"
"github.com/youtube/vitess/go/vt/sqlparser"
"github.com/youtube/vitess/go/vt/vterrors"
querypb "github.com/youtube/vitess/go/vt/proto/query"
topodatapb "github.com/youtube/vitess/go/vt/proto/topodata"
vtgatepb "github.com/youtube/vitess/go/vt/proto/vtgate"
vtrpcpb "github.com/youtube/vitess/go/vt/proto/vtrpc"
"github.com/youtube/vitess/go/vt/vttablet/tabletserver/querytypes"
)
type queryExecutor struct {
ctx context.Context
tabletType topodatapb.TabletType
session *vtgatepb.Session
options *querypb.ExecuteOptions
router *Router
}
func newQueryExecutor(ctx context.Context, tabletType topodatapb.TabletType, session *vtgatepb.Session, options *querypb.ExecuteOptions, router *Router) *queryExecutor {
return &queryExecutor{
ctx: ctx,
tabletType: tabletType,
session: session,
options: options,
router: router,
}
}
// Execute method call from vindex call to vtgate.
func (vc *queryExecutor) Execute(query string, bindvars map[string]interface{}) (*sqltypes.Result, error) {
// We have to use an empty keyspace here, becasue vindexes that call back can reference
// any table.
return vc.router.Execute(vc.ctx, query, bindvars, "", vc.tabletType, vc.session, false, vc.options)
}
// ExecuteMultiShard method call from engine call to vtgate.
func (vc *queryExecutor) ExecuteMultiShard(keyspace string, shardQueries map[string]querytypes.BoundQuery, notInTransaction bool) (*sqltypes.Result, error) {
return vc.router.scatterConn.ExecuteMultiShard(vc.ctx, keyspace, shardQueries, vc.tabletType, NewSafeSession(vc.session), notInTransaction, vc.options)
}
// StreamExecuteMulti method call from engine call to vtgate.
func (vc *queryExecutor) StreamExecuteMulti(query string, keyspace string, shardVars map[string]map[string]interface{}, callback func(reply *sqltypes.Result) error) error {
return vc.router.scatterConn.StreamExecuteMulti(vc.ctx, query, keyspace, shardVars, vc.tabletType, vc.options, callback)
}
// GetAnyShard method call from engine call to vtgate.
func (vc *queryExecutor) GetAnyShard(keyspace string) (ks, shard string, err error) {
return getAnyShard(vc.ctx, vc.router.serv, vc.router.cell, keyspace, vc.tabletType)
}
// ScatterConnExecute method call from engine call to vtgate.
func (vc *queryExecutor) ScatterConnExecute(query string, bindVars map[string]interface{}, keyspace string, shards []string, notInTransaction bool) (*sqltypes.Result, error) {
return vc.router.scatterConn.Execute(vc.ctx, query, bindVars, keyspace, shards, vc.tabletType, NewSafeSession(vc.session), notInTransaction, vc.options)
}
// GetKeyspaceShards method call from engine call to vtgate.
func (vc *queryExecutor) GetKeyspaceShards(keyspace string) (string, *topodatapb.SrvKeyspace, []*topodatapb.ShardReference, error) {
return getKeyspaceShards(vc.ctx, vc.router.serv, vc.router.cell, keyspace, vc.tabletType)
}
// GetShardForKeyspaceID method call from engine call to vtgate.
func (vc *queryExecutor) GetShardForKeyspaceID(allShards []*topodatapb.ShardReference, keyspaceID []byte) (string, error) {
return getShardForKeyspaceID(allShards, keyspaceID)
}
func (vc *queryExecutor) ExecuteShard(keyspace string, shardQueries map[string]querytypes.BoundQuery) (*sqltypes.Result, error) {
return vc.router.scatterConn.ExecuteMultiShard(vc.ctx, keyspace, shardQueries, vc.tabletType, NewSafeSession(nil), false, vc.options)
}
func (vc *queryExecutor) ExecuteShow(query string, bindvars map[string]interface{}, keyspace string) (*sqltypes.Result, error) {
if query == sqlparser.ShowDatabasesStr || query == sqlparser.ShowKeyspacesStr {
keyspaces, err := getAllKeyspaces(vc.ctx, vc.router.serv, vc.router.cell)
if err != nil {
return nil, err
}
rows := make([][]sqltypes.Value, len(keyspaces))
for i, v := range keyspaces {
rows[i] = []sqltypes.Value{sqltypes.MakeString([]byte(v))}
}
result := &sqltypes.Result{
Fields: []*querypb.Field{{
Name: "Databases",
Type: sqltypes.VarChar,
}},
RowsAffected: uint64(len(keyspaces)),
InsertID: 0,
Rows: rows,
}
return result, nil
}
if query == sqlparser.ShowShardsStr {
keyspaces, err := getAllKeyspaces(vc.ctx, vc.router.serv, vc.router.cell)
if err != nil {
return nil, err
}
var shards []string
for _, keyspace := range keyspaces {
_, _, ks_shards, err := getKeyspaceShards(vc.ctx, vc.router.serv, vc.router.cell, keyspace, vc.tabletType)
if err != nil {
return nil, err
}
for _, shard := range ks_shards {
shards = append(shards, keyspace+"/"+shard.Name)
}
}
rows := make([][]sqltypes.Value, len(shards))
for i, v := range shards {
rows[i] = []sqltypes.Value{sqltypes.MakeString([]byte(v))}
}
result := &sqltypes.Result{
Fields: []*querypb.Field{{
Name: "Shards",
Type: sqltypes.VarChar,
}},
RowsAffected: uint64(len(shards)),
InsertID: 0,
Rows: rows,
}
return result, nil
}
if query == sqlparser.ShowVSchemaTablesStr {
if keyspace == "" {
return nil, vterrors.Errorf(vtrpcpb.Code_INVALID_ARGUMENT, "No keyspace selected")
}
vschema := vc.router.planner.VSchema()
if vschema == nil {
return nil, vterrors.Errorf(vtrpcpb.Code_FAILED_PRECONDITION, "vschema not initialized")
}
ks, ok := vschema.Keyspaces[keyspace]
if !ok {
return nil, vterrors.Errorf(vtrpcpb.Code_NOT_FOUND, "keyspace %s not found in vschema", keyspace)
}
var tables []string;
for name := range ks.Tables {
tables = append(tables, name)
}
sort.Strings(tables)
rows := make([][]sqltypes.Value, len(tables))
for i, v := range tables {
rows[i] = []sqltypes.Value{sqltypes.MakeString([]byte(v))}
}
result := &sqltypes.Result{
Fields: []*querypb.Field{{
Name: "Tables",
Type: sqltypes.VarChar,
}},
RowsAffected: uint64(len(rows)),
InsertID: 0,
Rows: rows,
}
return result, nil
}
return nil, vterrors.Errorf(vtrpcpb.Code_UNIMPLEMENTED, "unimplemented metadata query: "+query)
}