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// Copyright 2016 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
package vmimpl
import (
"bytes"
"context"
"errors"
"io"
"testing"
"time"
"github.com/google/syzkaller/pkg/osutil"
"github.com/stretchr/testify/assert"
)
func TestMerger(t *testing.T) {
tee := new(bytes.Buffer)
merger := NewOutputMerger(tee)
rp1, wp1, err := osutil.LongPipe()
if err != nil {
t.Fatal(err)
}
defer wp1.Close()
merger.Add("pipe1", OutputConsole, rp1)
rp2, wp2, err := osutil.LongPipe()
if err != nil {
t.Fatal(err)
}
defer wp2.Close()
merger.Add("pipe2", OutputConsole, rp2)
wp1.Write([]byte("111"))
select {
case <-merger.Output:
t.Fatalf("merger produced incomplete line")
case <-time.After(10 * time.Millisecond):
}
wp2.Write([]byte("222"))
select {
case <-merger.Output:
t.Fatalf("merger produced incomplete line")
case <-time.After(10 * time.Millisecond):
}
wp1.Write([]byte("333\n444\r"))
got := (<-merger.Output).Data
if want := "111333\n"; string(got) != want {
t.Fatalf("bad line: '%s', want '%s'", got, want)
}
wp2.Write([]byte("555\r\n666\n\r\r777"))
got = (<-merger.Output).Data
if want := "222555\n666\n"; string(got) != want {
t.Fatalf("bad line: '%s', want '%s'", got, want)
}
// We need to robustly read until we get what we want if we want to be safe.
// But for now let's just match what the implementation does.
// The implementation sends everything it read.
wp1.Close()
got = (<-merger.Output).Data
if want := "444\n"; string(got) != want {
t.Fatalf("bad line: '%s', want '%s'", got, want)
}
var merr MergerError
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
if err := <-merger.Errors(ctx); err == nil {
t.Fatalf("merger did not produce an error on pipe close")
} else if !errors.As(err, &merr) || merr.Name != "pipe1" || merr.R != rp1 || merr.Err != io.EOF {
t.Fatalf("merger produced wrong error: %v", err)
}
wp2.Close()
got = (<-merger.Output).Data
if want := "777\n"; string(got) != want {
t.Fatalf("bad line: '%s', want '%s'", got, want)
}
merger.Wait()
want := "111333\n222555\n666\n444\n777\n"
if got := tee.String(); got != want {
t.Fatalf("bad tee: '%s', want '%s'", got, want)
}
}
type brokenReader struct {
err error
}
func (r *brokenReader) Read(p []byte) (int, error) {
return 0, r.err
}
func (r *brokenReader) Close() error { return nil }
func TestMergerErrors(t *testing.T) {
merger := NewOutputMerger(nil)
r1 := &brokenReader{errors.New("foo")}
merger.Add("foo", OutputConsole, r1)
ctx := context.Background()
var merr MergerError
// Add a background reader that will just hang.
rHang, wHang, err := osutil.LongPipe()
if err != nil {
t.Fatal(err)
}
merger.Add("background", OutputConsole, rHang)
err = <-merger.Errors(ctx)
if assert.Error(t, err) {
assert.True(t, errors.As(err, &merr))
assert.Equal(t, "foo", merr.Name)
assert.EqualError(t, merr.Err, "foo")
}
// The error must persist.
err = <-merger.Errors(ctx)
if assert.Error(t, err) {
assert.True(t, errors.As(err, &merr))
assert.Equal(t, "foo", merr.Name)
assert.EqualError(t, merr.Err, "foo")
}
// We re-add the decoder as "foo".
// The previous error should be gone.
r2 := &brokenReader{errors.New("bar")}
merger.Add("foo", OutputConsole, r2)
err = <-merger.Errors(ctx)
if assert.Error(t, err) {
assert.True(t, errors.As(err, &merr))
assert.Equal(t, "foo", merr.Name)
assert.EqualError(t, merr.Err, "bar")
}
wHang.Close()
merger.Wait()
}
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