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//go:build linux
package streamcache
import (
"bytes"
"io"
"math/rand"
"os"
"path/filepath"
"testing"
"testing/iotest"
"github.com/stretchr/testify/require"
"gitlab.com/gitlab-org/gitaly/v16/internal/testhelper"
)
type wrappedFile struct{ f *os.File }
func (wf *wrappedFile) Write(p []byte) (int, error) { return wf.f.Write(p) }
func (wf *wrappedFile) Close() error { return wf.f.Close() }
func (wf *wrappedFile) Name() string { return wf.f.Name() }
func TestPipe_WriteTo(t *testing.T) {
data := make([]byte, 10*1024*1024)
_, err := rand.Read(data)
require.NoError(t, err)
testCases := []struct {
desc string
create func(t *testing.T) namedWriteCloser
sendfile bool
}{
{
desc: "os.File",
create: func(t *testing.T) namedWriteCloser {
f, err := os.Create(filepath.Join(testhelper.TempDir(t), "pipe write to"))
require.NoError(t, err)
t.Cleanup(func() { require.NoError(t, os.Remove(f.Name())) })
return f
},
sendfile: true,
},
{
desc: "non-file writer",
create: func(t *testing.T) namedWriteCloser {
f, err := os.Create(filepath.Join(testhelper.TempDir(t), "pipe write to"))
require.NoError(t, err)
t.Cleanup(func() { require.NoError(t, os.Remove(f.Name())) })
return &wrappedFile{f}
},
},
}
for _, tc := range testCases {
t.Run(tc.desc, func(t *testing.T) {
pr, p := createPipe(t)
defer pr.Close()
errC := make(chan error, 1)
go func() {
errC <- func() error {
defer p.Close()
// To exercise pipe blocking logic, we want to prevent writing all of
// data at once.
r := iotest.HalfReader(bytes.NewReader(data))
if _, err := io.Copy(p, r); err != nil {
return err
}
return p.Close()
}()
}()
outW := tc.create(t)
require.NoError(t, err)
defer outW.Close()
n, err := pr.WriteTo(outW)
require.NoError(t, err)
require.Equal(t, int64(len(data)), n)
require.NoError(t, outW.Close())
require.NoError(t, <-errC)
outBytes, err := os.ReadFile(outW.Name())
require.NoError(t, err)
// Don't use require.Equal because we don't want a 10MB error message.
require.True(t, bytes.Equal(data, outBytes))
require.Equal(t, tc.sendfile, pr.sendfileCalledSuccessfully)
})
}
}
func TestPipe_WriteTo_EAGAIN(t *testing.T) {
data := make([]byte, 10*1024*1024)
_, err := rand.Read(data)
require.NoError(t, err)
pr, p := createPipe(t)
defer pr.Close()
defer p.Close()
_, err = p.Write(data)
require.NoError(t, err)
require.NoError(t, p.Close())
fr, fw, err := os.Pipe()
require.NoError(t, err)
defer fr.Close()
defer fw.Close()
errC := make(chan error, 1)
go func() {
errC <- func() error {
defer fw.Close()
// This will try to write 10MB into fw at once, which will fail because
// the pipe buffer is too small. Then sendfile will return EAGAIN. Doing
// this tests our ability to handle EAGAIN correctly.
_, err := pr.WriteTo(fw)
if err != nil {
return err
}
return fw.Close()
}()
}()
out, err := io.ReadAll(fr)
require.NoError(t, err)
// Don't use require.Equal because we don't want a 10MB error message.
require.True(t, bytes.Equal(data, out))
require.NoError(t, <-errC)
require.True(t, pr.sendfileCalledSuccessfully)
}
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