Close #124: Add support for Postgres as a storage solution
This commit is contained in:
TwinProduction
251
vendor/github.com/lib/pq/conn_go18.go
generated
vendored
Normal file
251
vendor/github.com/lib/pq/conn_go18.go
generated
vendored
Normal file
@ -0,0 +1,251 @@
|
||||
package pq
|
||||
|
||||
import (
|
||||
"context"
|
||||
"database/sql"
|
||||
"database/sql/driver"
|
||||
"fmt"
|
||||
"io"
|
||||
"io/ioutil"
|
||||
"sync/atomic"
|
||||
"time"
|
||||
)
|
||||
|
||||
const (
|
||||
watchCancelDialContextTimeout = time.Second * 10
|
||||
)
|
||||
|
||||
// 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 "ConnPrepareContext" interface
|
||||
func (cn *conn) PrepareContext(ctx context.Context, query string) (driver.Stmt, error) {
|
||||
if finish := cn.watchCancel(ctx); finish != nil {
|
||||
defer finish()
|
||||
}
|
||||
return cn.Prepare(query)
|
||||
}
|
||||
|
||||
// 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) Ping(ctx context.Context) error {
|
||||
if finish := cn.watchCancel(ctx); finish != nil {
|
||||
defer finish()
|
||||
}
|
||||
rows, err := cn.simpleQuery(";")
|
||||
if err != nil {
|
||||
return driver.ErrBadConn // https://golang.org/pkg/database/sql/driver/#Pinger
|
||||
}
|
||||
rows.Close()
|
||||
return nil
|
||||
}
|
||||
|
||||
func (cn *conn) watchCancel(ctx context.Context) func() {
|
||||
if done := ctx.Done(); done != nil {
|
||||
finished := make(chan struct{}, 1)
|
||||
go func() {
|
||||
select {
|
||||
case <-done:
|
||||
select {
|
||||
case finished <- struct{}{}:
|
||||
default:
|
||||
// We raced with the finish func, let the next query handle this with the
|
||||
// context.
|
||||
return
|
||||
}
|
||||
|
||||
// Set the connection state to bad so it does not get reused.
|
||||
cn.setBad()
|
||||
|
||||
// At this point the function level context is canceled,
|
||||
// so it must not be used for the additional network
|
||||
// request to cancel the query.
|
||||
// Create a new context to pass into the dial.
|
||||
ctxCancel, cancel := context.WithTimeout(context.Background(), watchCancelDialContextTimeout)
|
||||
defer cancel()
|
||||
|
||||
_ = cn.cancel(ctxCancel)
|
||||
case <-finished:
|
||||
}
|
||||
}()
|
||||
return func() {
|
||||
select {
|
||||
case <-finished:
|
||||
cn.setBad()
|
||||
cn.Close()
|
||||
case finished <- struct{}{}:
|
||||
}
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func (cn *conn) cancel(ctx context.Context) error {
|
||||
// Create a new values map (copy). This makes sure the connection created
|
||||
// in this method cannot write to the same underlying data, which could
|
||||
// cause a concurrent map write panic. This is necessary because cancel
|
||||
// is called from a goroutine in watchCancel.
|
||||
o := make(values)
|
||||
for k, v := range cn.opts {
|
||||
o[k] = v
|
||||
}
|
||||
|
||||
c, err := dial(ctx, cn.dialer, o)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
defer c.Close()
|
||||
|
||||
{
|
||||
bad := &atomic.Value{}
|
||||
bad.Store(false)
|
||||
can := conn{
|
||||
c: c,
|
||||
bad: bad,
|
||||
}
|
||||
err = can.ssl(o)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
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
|
||||
}
|
||||
}
|
||||
|
||||
// Implement the "StmtQueryContext" interface
|
||||
func (st *stmt) QueryContext(ctx context.Context, args []driver.NamedValue) (driver.Rows, error) {
|
||||
list := make([]driver.Value, len(args))
|
||||
for i, nv := range args {
|
||||
list[i] = nv.Value
|
||||
}
|
||||
finish := st.watchCancel(ctx)
|
||||
r, err := st.query(list)
|
||||
if err != nil {
|
||||
if finish != nil {
|
||||
finish()
|
||||
}
|
||||
return nil, err
|
||||
}
|
||||
r.finish = finish
|
||||
return r, nil
|
||||
}
|
||||
|
||||
// Implement the "StmtExecContext" interface
|
||||
func (st *stmt) ExecContext(ctx context.Context, args []driver.NamedValue) (driver.Result, error) {
|
||||
list := make([]driver.Value, len(args))
|
||||
for i, nv := range args {
|
||||
list[i] = nv.Value
|
||||
}
|
||||
|
||||
if finish := st.watchCancel(ctx); finish != nil {
|
||||
defer finish()
|
||||
}
|
||||
|
||||
return st.Exec(list)
|
||||
}
|
||||
|
||||
// watchCancel is implemented on stmt in order to not mark the parent conn as bad
|
||||
func (st *stmt) watchCancel(ctx context.Context) func() {
|
||||
if done := ctx.Done(); done != nil {
|
||||
finished := make(chan struct{})
|
||||
go func() {
|
||||
select {
|
||||
case <-done:
|
||||
// At this point the function level context is canceled,
|
||||
// so it must not be used for the additional network
|
||||
// request to cancel the query.
|
||||
// Create a new context to pass into the dial.
|
||||
ctxCancel, cancel := context.WithTimeout(context.Background(), watchCancelDialContextTimeout)
|
||||
defer cancel()
|
||||
|
||||
_ = st.cancel(ctxCancel)
|
||||
finished <- struct{}{}
|
||||
case <-finished:
|
||||
}
|
||||
}()
|
||||
return func() {
|
||||
select {
|
||||
case <-finished:
|
||||
case finished <- struct{}{}:
|
||||
}
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func (st *stmt) cancel(ctx context.Context) error {
|
||||
return st.cn.cancel(ctx)
|
||||
}
|
||||
Reference in New Issue
Block a user