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database/sql: add context methods

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Add context methods to sql and sql/driver methods. If
the driver doesn't implement context methods the connection
pool will still handle timeouts when a query fails to return
in time or when a connection is not available from the pool
in time.

There will be a follow-up CL that will add support for
context values that specify transaction levels and modes
that a driver can use.

Fixes #15123

Change-Id: Ia99f3957aa3f177b23044dd99d4ec217491a30a7
Reviewed-on: https://go-review.googlesource.com/29381
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Daniel Theophanes 2016-09-19 11:19:32 -07:00 • committed by Brad Fitzpatrick
parent 54a72d90f6
commit e13df02e5f
5 changed files with 534 additions and 109 deletions
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231
src/database/sql/ctxutil.go Normal file
View file

@ -0,0 +1,231 @@
// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package sql
import (
"context"
"database/sql/driver"
"errors"
)
func ctxDriverPrepare(ctx context.Context, ci driver.Conn, query string) (driver.Stmt, error) {
if ciCtx, is := ci.(driver.ConnPrepareContext); is {
return ciCtx.PrepareContext(ctx, query)
}
type R struct {
err error
panic interface{}
si driver.Stmt
}
rc := make(chan R, 1)
go func() {
r := R{}
defer func() {
if v := recover(); v != nil {
r.panic = v
}
rc <- r
}()
r.si, r.err = ci.Prepare(query)
}()
select {
case <-ctx.Done():
go func() {
<-rc
close(rc)
}()
return nil, ctx.Err()
case r := <-rc:
if r.panic != nil {
panic(r.panic)
}
return r.si, r.err
}
}
func ctxDriverExec(ctx context.Context, execer driver.Execer, query string, dargs []driver.Value) (driver.Result, error) {
if execerCtx, is := execer.(driver.ExecerContext); is {
return execerCtx.ExecContext(ctx, query, dargs)
}
type R struct {
err error
panic interface{}
resi driver.Result
}
rc := make(chan R, 1)
go func() {
r := R{}
defer func() {
if v := recover(); v != nil {
r.panic = v
}
rc <- r
}()
r.resi, r.err = execer.Exec(query, dargs)
}()
select {
case <-ctx.Done():
go func() {
<-rc
close(rc)
}()
return nil, ctx.Err()
case r := <-rc:
if r.panic != nil {
panic(r.panic)
}
return r.resi, r.err
}
}
func ctxDriverQuery(ctx context.Context, queryer driver.Queryer, query string, dargs []driver.Value) (driver.Rows, error) {
if queryerCtx, is := queryer.(driver.QueryerContext); is {
return queryerCtx.QueryContext(ctx, query, dargs)
}
type R struct {
err error
panic interface{}
rowsi driver.Rows
}
rc := make(chan R, 1)
go func() {
r := R{}
defer func() {
if v := recover(); v != nil {
r.panic = v
}
rc <- r
}()
r.rowsi, r.err = queryer.Query(query, dargs)
}()
select {
case <-ctx.Done():
go func() {
<-rc
close(rc)
}()
return nil, ctx.Err()
case r := <-rc:
if r.panic != nil {
panic(r.panic)
}
return r.rowsi, r.err
}
}
func ctxDriverStmtExec(ctx context.Context, si driver.Stmt, dargs []driver.Value) (driver.Result, error) {
if siCtx, is := si.(driver.StmtExecContext); is {
return siCtx.ExecContext(ctx, dargs)
}
type R struct {
err error
panic interface{}
resi driver.Result
}
rc := make(chan R, 1)
go func() {
r := R{}
defer func() {
if v := recover(); v != nil {
r.panic = v
}
rc <- r
}()
r.resi, r.err = si.Exec(dargs)
}()
select {
case <-ctx.Done():
go func() {
<-rc
close(rc)
}()
return nil, ctx.Err()
case r := <-rc:
if r.panic != nil {
panic(r.panic)
}
return r.resi, r.err
}
}
func ctxDriverStmtQuery(ctx context.Context, si driver.Stmt, dargs []driver.Value) (driver.Rows, error) {
if siCtx, is := si.(driver.StmtQueryContext); is {
return siCtx.QueryContext(ctx, dargs)
}
type R struct {
err error
panic interface{}
rowsi driver.Rows
}
rc := make(chan R, 1)
go func() {
r := R{}
defer func() {
if v := recover(); v != nil {
r.panic = v
}
rc <- r
}()
r.rowsi, r.err = si.Query(dargs)
}()
select {
case <-ctx.Done():
go func() {
<-rc
close(rc)
}()
return nil, ctx.Err()
case r := <-rc:
if r.panic != nil {
panic(r.panic)
}
return r.rowsi, r.err
}
}
var errLevelNotSupported = errors.New("sql: selected isolation level is not supported")
func ctxDriverBegin(ctx context.Context, ci driver.Conn) (driver.Tx, error) {
if ciCtx, is := ci.(driver.ConnBeginContext); is {
return ciCtx.BeginContext(ctx)
}
// TODO(kardianos): check the transaction level in ctx. If set and non-default
// then return an error here as the BeginContext driver value is not supported.
type R struct {
err error
panic interface{}
txi driver.Tx
}
rc := make(chan R, 1)
go func() {
r := R{}
defer func() {
if v := recover(); v != nil {
r.panic = v
}
rc <- r
}()
r.txi, r.err = ci.Begin()
}()
select {
case <-ctx.Done():
go func() {
<-rc
close(rc)
}()
return nil, ctx.Err()
case r := <-rc:
if r.panic != nil {
panic(r.panic)
}
return r.txi, r.err
}
}