129 lines
2.5 KiB
Go
129 lines
2.5 KiB
Go
// +build go1.8
|
|
|
|
package pq
|
|
|
|
import (
|
|
"context"
|
|
"database/sql"
|
|
"database/sql/driver"
|
|
"fmt"
|
|
"io"
|
|
"io/ioutil"
|
|
)
|
|
|
|
// Implement the "QueryerContext" interface
|
|
func (cn *conn) QueryContext(ctx context.Context, query string, args []driver.NamedValue) (driver.Rows, error) {
|
|
list := make([]driver.Value, len(args))
|
|
for i, nv := range args {
|
|
list[i] = nv.Value
|
|
}
|
|
finish := cn.watchCancel(ctx)
|
|
r, err := cn.query(query, list)
|
|
if err != nil {
|
|
if finish != nil {
|
|
finish()
|
|
}
|
|
return nil, err
|
|
}
|
|
r.finish = finish
|
|
return r, nil
|
|
}
|
|
|
|
// Implement the "ExecerContext" interface
|
|
func (cn *conn) ExecContext(ctx context.Context, query string, args []driver.NamedValue) (driver.Result, error) {
|
|
list := make([]driver.Value, len(args))
|
|
for i, nv := range args {
|
|
list[i] = nv.Value
|
|
}
|
|
|
|
if finish := cn.watchCancel(ctx); finish != nil {
|
|
defer finish()
|
|
}
|
|
|
|
return cn.Exec(query, list)
|
|
}
|
|
|
|
// Implement the "ConnBeginTx" interface
|
|
func (cn *conn) BeginTx(ctx context.Context, opts driver.TxOptions) (driver.Tx, error) {
|
|
var mode string
|
|
|
|
switch sql.IsolationLevel(opts.Isolation) {
|
|
case sql.LevelDefault:
|
|
// Don't touch mode: use the server's default
|
|
case sql.LevelReadUncommitted:
|
|
mode = " ISOLATION LEVEL READ UNCOMMITTED"
|
|
case sql.LevelReadCommitted:
|
|
mode = " ISOLATION LEVEL READ COMMITTED"
|
|
case sql.LevelRepeatableRead:
|
|
mode = " ISOLATION LEVEL REPEATABLE READ"
|
|
case sql.LevelSerializable:
|
|
mode = " ISOLATION LEVEL SERIALIZABLE"
|
|
default:
|
|
return nil, fmt.Errorf("pq: isolation level not supported: %d", opts.Isolation)
|
|
}
|
|
|
|
if opts.ReadOnly {
|
|
mode += " READ ONLY"
|
|
} else {
|
|
mode += " READ WRITE"
|
|
}
|
|
|
|
tx, err := cn.begin(mode)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
cn.txnFinish = cn.watchCancel(ctx)
|
|
return tx, nil
|
|
}
|
|
|
|
func (cn *conn) watchCancel(ctx context.Context) func() {
|
|
if done := ctx.Done(); done != nil {
|
|
finished := make(chan struct{})
|
|
go func() {
|
|
select {
|
|
case <-done:
|
|
_ = cn.cancel()
|
|
finished <- struct{}{}
|
|
case <-finished:
|
|
}
|
|
}()
|
|
return func() {
|
|
select {
|
|
case <-finished:
|
|
case finished <- struct{}{}:
|
|
}
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (cn *conn) cancel() error {
|
|
c, err := dial(cn.dialer, cn.opts)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer c.Close()
|
|
|
|
{
|
|
can := conn{
|
|
c: c,
|
|
}
|
|
can.ssl(cn.opts)
|
|
|
|
w := can.writeBuf(0)
|
|
w.int32(80877102) // cancel request code
|
|
w.int32(cn.processID)
|
|
w.int32(cn.secretKey)
|
|
|
|
if err := can.sendStartupPacket(w); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
// Read until EOF to ensure that the server received the cancel.
|
|
{
|
|
_, err := io.Copy(ioutil.Discard, c)
|
|
return err
|
|
}
|
|
}
|