// exec executes the request. Any error encountered is returned; it is
// the caller's responsibility to update the response.
func (s *Server) exec(req driver.Request) (driver.Response, error) {
var resp driver.Response
// Pick up current session state.
planner := planner{db: s.db}
if req.Session != nil {
// TODO(tschottdorf) will have to validate the Session information (for
// instance, whether access to the stored database is permitted).
if err := gogoproto.Unmarshal(req.Session, &planner.session); err != nil {
return resp, err
}
}
stmts, err := parser.Parse(req.Sql)
if err != nil {
return resp, err
}
for _, stmt := range stmts {
// Bind all the placeholder variables in the stmt to actual values.
if err := parser.FillArgs(stmt, parameters(req.Params)); err != nil {
return resp, err
}
var plan planNode
if plan, err = planner.makePlan(stmt); err != nil {
return resp, err
}
result := driver.Result{
Columns: plan.Columns(),
}
for plan.Next() {
values := plan.Values()
row := driver.Result_Row{}
row.Values = make([]driver.Datum, 0, len(values))
for _, val := range values {
switch vt := val.(type) {
case parser.DBool:
row.Values = append(row.Values, driver.Datum{BoolVal: (*bool)(&vt)})
case parser.DInt:
row.Values = append(row.Values, driver.Datum{IntVal: (*int64)(&vt)})
case parser.DFloat:
row.Values = append(row.Values, driver.Datum{FloatVal: (*float64)(&vt)})
case parser.DString:
row.Values = append(row.Values, driver.Datum{StringVal: (*string)(&vt)})
case parser.DNull:
row.Values = append(row.Values, driver.Datum{})
default:
return resp, util.Errorf("unsupported datum: %T", val)
}
}
result.Rows = append(result.Rows, row)
}
resp.Results = append(resp.Results, result)
}
// Update session state.
resp.Session, err = gogoproto.Marshal(&planner.session)
return resp, err
}
func (s server) execStmt(stmt parser.Statement, params parameters, planMaker *planner) (driver.Result, error) {
var result driver.Result
if planMaker.txn == nil {
if _, ok := stmt.(*parser.BeginTransaction); ok {
// Start a transaction here and not in planMaker to prevent begin
// transaction from being called within an auto-transaction below.
planMaker.txn = client.NewTxn(s.db)
planMaker.txn.SetDebugName("sql", 0)
}
} else if planMaker.txn.Proto.Status == proto.ABORTED {
switch stmt.(type) {
case *parser.CommitTransaction, *parser.RollbackTransaction:
// Reset to allow starting a new transaction.
planMaker.txn = nil
return result, nil
default:
return result, errTransactionAborted
}
}
// Bind all the placeholder variables in the stmt to actual values.
if err := parser.FillArgs(stmt, params); err != nil {
return result, err
}
var plan planNode
// If there is a pending transaction.
if planMaker.txn != nil {
// Run in transaction planMaker.txn
var err error
if plan, err = planMaker.makePlan(stmt); err != nil {
return result, err
}
} else {
// No transaction. Run the command as a retryable block in an
// auto-transaction.
if err := s.db.Txn(func(txn *client.Txn) error {
planMaker.txn = txn
var err error
plan, err = planMaker.makePlan(stmt)
planMaker.txn = nil
return err
}); err != nil {
return result, err
}
}
result.Columns = plan.Columns()
for plan.Next() {
values := plan.Values()
row := driver.Result_Row{Values: make([]driver.Datum, 0, len(values))}
for _, val := range values {
if val == parser.DNull {
row.Values = append(row.Values, driver.Datum{})
} else {
switch vt := val.(type) {
case parser.DBool:
row.Values = append(row.Values, driver.Datum{BoolVal: (*bool)(&vt)})
case parser.DInt:
row.Values = append(row.Values, driver.Datum{IntVal: (*int64)(&vt)})
case parser.DFloat:
row.Values = append(row.Values, driver.Datum{FloatVal: (*float64)(&vt)})
case parser.DString:
row.Values = append(row.Values, driver.Datum{StringVal: (*string)(&vt)})
case parser.DDate:
s := vt.String()
row.Values = append(row.Values, driver.Datum{StringVal: &s})
case parser.DTimestamp:
s := vt.String()
row.Values = append(row.Values, driver.Datum{StringVal: &s})
case parser.DInterval:
s := vt.String()
row.Values = append(row.Values, driver.Datum{StringVal: &s})
default:
return result, util.Errorf("unsupported datum: %T", val)
}
}
}
result.Rows = append(result.Rows, row)
}
if err := plan.Err(); err != nil {
return result, err
}
return result, nil
}
func (e Executor) execStmt(stmt parser.Statement, params parameters, planMaker *planner) (driver.Result, error) {
var result driver.Result
switch stmt.(type) {
case *parser.BeginTransaction:
if planMaker.txn != nil {
return result, errTransactionInProgress
}
// Start a transaction here and not in planMaker to prevent begin
// transaction from being called within an auto-transaction below.
planMaker.txn = client.NewTxn(e.db)
planMaker.txn.SetDebugName("sql", 0)
case *parser.CommitTransaction, *parser.RollbackTransaction:
if planMaker.txn != nil {
if planMaker.txn.Proto.Status == proto.ABORTED {
// Reset to allow starting a new transaction.
planMaker.txn = nil
return result, nil
}
} else {
return result, errNoTransactionInProgress
}
case *parser.SetTransaction:
if planMaker.txn == nil {
return result, errNoTransactionInProgress
}
default:
if planMaker.txn != nil && planMaker.txn.Proto.Status == proto.ABORTED {
return result, errTransactionAborted
}
}
// Bind all the placeholder variables in the stmt to actual values.
if err := parser.FillArgs(stmt, params); err != nil {
return result, err
}
// Create a function which both makes and executes the plan, populating
// result.
//
// TODO(pmattis): Should this be a separate function? Perhaps we should move
// some of the common code back out into execStmts and have execStmt contain
// only the body of this closure.
f := func() error {
plan, err := planMaker.makePlan(stmt)
if err != nil {
return err
}
result.Columns = plan.Columns()
for plan.Next() {
values := plan.Values()
row := driver.Result_Row{Values: make([]driver.Datum, 0, len(values))}
for _, val := range values {
if val == parser.DNull {
row.Values = append(row.Values, driver.Datum{})
} else {
switch vt := val.(type) {
case parser.DBool:
row.Values = append(row.Values, driver.Datum{
Payload: &driver.Datum_BoolVal{BoolVal: bool(vt)},
})
case parser.DInt:
row.Values = append(row.Values, driver.Datum{
Payload: &driver.Datum_IntVal{IntVal: int64(vt)},
})
case parser.DFloat:
row.Values = append(row.Values, driver.Datum{
Payload: &driver.Datum_FloatVal{FloatVal: float64(vt)},
})
case parser.DBytes:
row.Values = append(row.Values, driver.Datum{
Payload: &driver.Datum_BytesVal{BytesVal: []byte(vt)},
})
case parser.DString:
row.Values = append(row.Values, driver.Datum{
Payload: &driver.Datum_StringVal{StringVal: string(vt)},
})
case parser.DDate:
row.Values = append(row.Values, driver.Datum{
Payload: &driver.Datum_TimeVal{
TimeVal: &driver.Datum_Timestamp{
Sec: vt.Unix(),
Nsec: uint32(vt.Nanosecond()),
},
},
})
case parser.DTimestamp:
row.Values = append(row.Values, driver.Datum{
Payload: &driver.Datum_TimeVal{
TimeVal: &driver.Datum_Timestamp{
Sec: vt.Unix(),
Nsec: uint32(vt.Nanosecond()),
},
},
})
case parser.DInterval:
row.Values = append(row.Values, driver.Datum{
Payload: &driver.Datum_StringVal{StringVal: vt.String()},
})
default:
return util.Errorf("unsupported datum: %T", val)
}
}
}
result.Rows = append(result.Rows, row)
}
return plan.Err()
}
// If there is a pending transaction.
if planMaker.txn != nil {
err := f()
return result, err
}
// No transaction. Run the command as a retryable block in an
// auto-transaction.
err := e.db.Txn(func(txn *client.Txn) error {
planMaker.txn = txn
err := f()
planMaker.txn = nil
return err
})
return result, err
}
// exec executes the request. Any error encountered is returned; it is
// the caller's responsibility to update the response.
func (s *Server) exec(req driver.Request) (resp driver.Response, err error) {
// Pick up current session state.
// The request user is validated in ServeHTTP. Even in insecure mode,
// it is guaranteed not to be empty.
planMaker := planner{user: req.GetUser()}
defer func() {
// Update session state even if an error occurs.
if bytes, err := gogoproto.Marshal(&planMaker.session); err != nil {
// Marshaling a `Session` never errors (known from reading the code).
panic(err)
} else {
resp.Session = bytes
}
}()
if req.Session != nil {
// TODO(tschottdorf) will have to validate the Session information (for
// instance, whether access to the stored database is permitted).
if err = gogoproto.Unmarshal(req.Session, &planMaker.session); err != nil {
return
}
}
var stmts parser.StatementList
if stmts, err = parser.Parse(req.Sql); err != nil {
return
}
for _, stmt := range stmts {
// Bind all the placeholder variables in the stmt to actual values.
if err = parser.FillArgs(stmt, parameters(req.Params)); err != nil {
return
}
var plan planNode
if err = s.db.Txn(func(txn *client.Txn) error {
planMaker.txn = txn
plan, err = planMaker.makePlan(stmt)
planMaker.txn = nil
return err
}); err != nil {
return
}
result := driver.Result{
Columns: plan.Columns(),
}
for plan.Next() {
values := plan.Values()
row := driver.Result_Row{}
row.Values = make([]driver.Datum, 0, len(values))
for _, val := range values {
if val == parser.DNull {
row.Values = append(row.Values, driver.Datum{})
} else {
switch vt := val.(type) {
case parser.DBool:
row.Values = append(row.Values, driver.Datum{BoolVal: (*bool)(&vt)})
case parser.DInt:
row.Values = append(row.Values, driver.Datum{IntVal: (*int64)(&vt)})
case parser.DFloat:
row.Values = append(row.Values, driver.Datum{FloatVal: (*float64)(&vt)})
case parser.DString:
row.Values = append(row.Values, driver.Datum{StringVal: (*string)(&vt)})
default:
err = util.Errorf("unsupported datum: %T", val)
return
}
}
}
result.Rows = append(result.Rows, row)
}
if err = plan.Err(); err != nil {
return
}
resp.Results = append(resp.Results, result)
}
return
}