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interp: make read cancellable via Run's ctx #857

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interp: make read cancellable via Run's ctx #857

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interp: make `read` cancellable via Run's ctx
theclapp May 5, 2022
8ac39ce
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theclapp May 6, 2022
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theclapp May 7, 2022
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theclapp May 10, 2022
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theclapp May 16, 2022
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@theclapp
theclapp committed Jan 7, 2023
commit c9a0d60048d098c43690126d71ee09c52c83d467
23 changes: 4 additions & 19 deletions interp/builtin.go
View file
Original file line number Diff line number Diff line change
@@ -10,6 +10,7 @@ import (
"errors"
"fmt"
"io"
"log"
"os"
"path/filepath"
"strconv"
@@ -925,26 +926,10 @@ func (r *Runner) readLine(raw bool) ([]byte, error) {
return nil, errors.New("interp: can't read, there's no stdin")
}

// log.Printf("readLine")
log.Printf("readLine")
stdin := r.stdin
if eofWriter, ok := stdin.(*EofWriter); ok {
// log.Printf("readLine starting NewEofReader")
eofReader, err := eofWriter.NewReader(r.ectx)
if err != nil {
return nil, err
}
stdin = eofReader
defer func() {
// log.Printf("readLine: eofWriter.EOF()")
eofWriter.CloseReader()
}()

// go func() {
// log.Printf("readLine cancel goroutine sleeping 5s")
// time.Sleep(5 * time.Second)
// log.Printf("readLine cancelling the EofReader")
// cr.Cancel()
// }()
stdin = eofWriter.R
}

var line []byte
@@ -953,7 +938,7 @@ func (r *Runner) readLine(raw bool) ([]byte, error) {
for {
var buf [1]byte
n, err := stdin.Read(buf[:])
// log.Printf("readline read %q, %d, %v", buf[:n], n, err)
log.Printf("readline read %q, %d, %v", buf[:n], n, err)
if n > 0 {
b := buf[0]
switch {
13 changes: 5 additions & 8 deletions interp/handler.go
View file
Original file line number Diff line number Diff line change
@@ -100,15 +100,13 @@ func DefaultExecHandler(killTimeout time.Duration) ExecHandlerFunc {
}

stdin := hc.Stdin
var eofReader io.ReadCloser
eofWriter, ok := stdin.(*EofWriter)
if ok {
eofReader, err = eofWriter.NewReader(ctx)
log.Printf("DefaultExecHandler: %s: eofReader: %p", path, eofWriter.R)
stdin, err = eofWriter.GetReader()
if err != nil {
return err
}
log.Printf("DefaultExecHandler: %s: eofReader: %p", path, eofReader)
stdin = eofReader
}

cmd := exec.Cmd{
@@ -153,10 +151,9 @@ func DefaultExecHandler(killTimeout time.Duration) ExecHandlerFunc {
// log.Printf("eofWriter.EOF error: %v", eofErr)
// }
}
if eofWriter != nil {
log.Printf("interp/handler: EofWriter.CloseReader(), %p", eofReader)
eofWriter.CloseReader()
}
// if eofWriter != nil {
// eofWriter.CloseReader()
// }

switch x := err.(type) {
case *exec.ExitError:
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