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results.go
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results.go
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package exec
import (
"database/sql/driver"
"io"
u "github.com/araddon/gou"
"github.com/araddon/qlbridge/datasource"
"github.com/araddon/qlbridge/expr"
"github.com/araddon/qlbridge/plan"
"github.com/araddon/qlbridge/schema"
)
const (
MaxAllowedPacket = 1024 * 1024
)
var (
_ = u.EMPTY
// ensure our resultwriter implements database/sql/driver `driver.Rows`
_ driver.Rows = (*ResultWriter)(nil)
// Ensure that we implement the Task Runner interface
// required for usage as tasks in Executor
_ TaskRunner = (*ResultExecWriter)(nil)
_ TaskRunner = (*ResultWriter)(nil)
_ TaskRunner = (*ResultBuffer)(nil)
)
type ResultExecWriter struct {
*TaskBase
closed bool
err error
rowsAffected int64
lastInsertId int64
}
type ResultWriter struct {
*TaskBase
closed bool
cols []string
}
type ResultBuffer struct {
*TaskBase
closed bool
cols []string
}
func NewResultExecWriter(ctx *plan.Context) *ResultExecWriter {
m := &ResultExecWriter{
TaskBase: NewTaskBase(ctx),
}
m.Handler = func(ctx *plan.Context, msg schema.Message) bool {
switch mt := msg.(type) {
case *datasource.SqlDriverMessage:
//u.Debugf("Result: T:%T vals:%#v", msg, mt.Vals)
if len(mt.Vals) > 1 {
m.lastInsertId = mt.Vals[0].(int64)
m.rowsAffected = mt.Vals[1].(int64)
}
case nil:
u.Warnf("got nil")
// Signal to quit
return false
default:
u.Errorf("could not convert to message reader: %T", msg)
}
return true
}
return m
}
func NewResultWriter(ctx *plan.Context) *ResultWriter {
m := &ResultWriter{
TaskBase: NewTaskBase(ctx),
}
m.Handler = resultWrite(m)
return m
}
func NewResultRows(ctx *plan.Context, cols []string) *ResultWriter {
stepper := NewTaskStepper(ctx)
m := &ResultWriter{
TaskBase: stepper.TaskBase,
cols: cols,
}
return m
}
func NewResultBuffer(ctx *plan.Context, writeTo *[]schema.Message) *ResultBuffer {
m := &ResultBuffer{
TaskBase: NewTaskBase(ctx),
}
m.Handler = func(ctx *plan.Context, msg schema.Message) bool {
*writeTo = append(*writeTo, msg)
//u.Infof("write to msgs: %v", len(*writeTo))
return true
}
return m
}
func (m *ResultExecWriter) Result() driver.Result {
return &qlbResult{m.lastInsertId, m.rowsAffected, m.err}
}
func (m *ResultExecWriter) Copy() *ResultExecWriter { return NewResultExecWriter(m.Ctx) }
func (m *ResultExecWriter) Close() error {
//u.Debugf("%p ResultExecWriter.Close()???? already closed?%v", m, m.closed)
m.Lock()
if m.closed {
m.Unlock()
return nil
}
m.closed = true
m.Unlock()
return m.TaskBase.Close()
}
func (m *ResultWriter) Copy() *ResultWriter { return NewResultWriter(m.Ctx) }
func (m *ResultWriter) Close() error {
u.Debugf("%p ResultWriter.Close()???? already closed?%v", m, m.closed)
m.Lock()
if m.closed {
m.Unlock()
return nil
}
m.closed = true
m.Unlock()
return m.TaskBase.Close()
}
func (m *ResultBuffer) Copy() *ResultBuffer { return NewResultBuffer(m.Ctx, nil) }
func (m *ResultBuffer) Close() error {
u.Debugf("%p ResultBuffer.Close()???? already closed?%v", m, m.closed)
m.Lock()
if m.closed {
m.Unlock()
return nil
}
m.closed = true
m.Unlock()
return m.TaskBase.Close()
}
// Note, this is implementation of the sql/driver Rows() Next() interface
func (m *ResultWriter) Next(dest []driver.Value) error {
//u.Debugf("resultwriter.Next()")
select {
case <-m.SigChan():
return ErrShuttingDown
case err := <-m.ErrChan():
return err
case msg, ok := <-m.MessageIn():
if !ok {
return io.EOF
}
if msg == nil {
//u.Warnf("nil message?")
return io.EOF
//return fmt.Errorf("Nil message error?")
}
//u.Infof("got msg: T:%T v:%#v", msg, msg)
return msgToRow(msg, m.cols, dest)
}
}
// For ResultWriter, since we are are not paging through messages
// using this mesage channel, instead using Next() as defined by sql/driver
// we don't read the input channel, just watch stop channels
func (m *ResultWriter) Run() error {
defer m.Ctx.Recover()
defer func() {
close(m.msgOutCh) // closing output channels is the signal to stop
//u.Warnf("close taskbase: %v", m.Type())
}()
//u.Debugf("start Run() for ResultWriter")
select {
case err := <-m.errCh:
u.Errorf("got error: %v", err)
return err
case <-m.sigCh:
u.Infof("%p got resultwriter.Run() sigquit?", m)
return nil
}
return nil
}
func (m *ResultWriter) Columns() []string {
return m.cols
}
func resultWrite(m *ResultWriter) MessageHandler {
out := m.MessageOut()
return func(ctx *plan.Context, msg schema.Message) bool {
if msgReader, ok := msg.Body().(expr.ContextReader); ok {
u.Debugf("got msg in result writer: %#v", msgReader)
} else {
u.Errorf("could not convert to message reader: %T", msg.Body())
}
select {
case out <- msg:
return true
case <-m.SigChan():
return false
}
}
}
func msgToRow(msg schema.Message, cols []string, dest []driver.Value) error {
//u.Debugf("msg? %v %T \n%p %v", msg, msg, dest, dest)
switch mt := msg.Body().(type) {
/*
case *datasource.ContextUrlValues:
for i, key := range cols {
if val, ok := mt.Get(key); ok && !val.Nil() {
dest[i] = val.Value()
//u.Infof("key=%v val=%v", key, val)
} else {
u.Warnf("missing value? %v %T %v", key, val.Value(), val.Value())
}
}
//u.Debugf("got msg in row result writer: %#v", mt)
case *datasource.ContextSimple:
for i, key := range cols {
//u.Debugf("key=%v mt = nil? %v", key, mt)
if val, ok := mt.Get(key); ok && val != nil && !val.Nil() {
dest[i] = val.Value()
//u.Infof("key=%v val=%v", key, val)
} else if val == nil {
u.Errorf("could not evaluate? %v %#v", key, mt)
} else {
u.Warnf("missing value? %v %T %v", key, val.Value(), val.Value())
}
}
//u.Debugf("got msg in row result writer: %#v", dest)
*/
case *datasource.SqlDriverMessageMap:
for i, key := range cols {
//u.Debugf("key=%v mt = nil? %v", key, mt)
if val, ok := mt.Get(key); ok && val != nil && !val.Nil() {
dest[i] = val.Value()
//u.Infof("key=%v val=%v", key, val)
} else if val == nil {
u.Errorf("could not evaluate? %v %#v", key, mt)
} else {
u.Warnf("missing value? %v %T %v", key, val.Value(), val.Value())
}
}
//u.Debugf("got msg in row result writer: %#v", dest)
default:
u.Errorf("unknown message type: %T", mt)
}
return nil
}