func readEntryFrom(r io.Reader, ent *raftpb.Entry) error {
var l uint64
if err := binary.Read(r, binary.BigEndian, &l); err != nil {
return err
}
buf := make([]byte, int(l))
if _, err := io.ReadFull(r, buf); err != nil {
return err
}
return ent.Unmarshal(buf)
}
func writeEntryTo(w io.Writer, ent *raftpb.Entry) error {
size := ent.Size()
if err := binary.Write(w, binary.BigEndian, uint64(size)); err != nil {
return err
}
b, err := ent.Marshal()
if err != nil {
return err
}
_, err = w.Write(b)
return err
}
func TestSlice(t *testing.T) {
var i uint64
offset := uint64(100)
num := uint64(100)
last := offset + num
half := offset + num/2
halfe := pb.Entry{Index: half, Term: half}
storage := NewMemoryStorage()
storage.ApplySnapshot(pb.Snapshot{Metadata: pb.SnapshotMetadata{Index: offset}})
for i = 1; i < num/2; i++ {
storage.Append([]pb.Entry{{Index: offset + i, Term: offset + i}})
}
l := newLog(storage)
for i = num / 2; i < num; i++ {
l.append(pb.Entry{Index: offset + i, Term: offset + i})
}
tests := []struct {
from uint64
to uint64
limit uint64
w []pb.Entry
wpanic bool
}{
// test no limit
{offset - 1, offset + 1, noLimit, nil, true},
{offset, offset + 1, noLimit, nil, true},
{half - 1, half + 1, noLimit, []pb.Entry{{Index: half - 1, Term: half - 1}, {Index: half, Term: half}}, false},
{half, half + 1, noLimit, []pb.Entry{{Index: half, Term: half}}, false},
{last - 1, last, noLimit, []pb.Entry{{Index: last - 1, Term: last - 1}}, false},
{last, last + 1, noLimit, nil, true},
// test limit
{half - 1, half + 1, 0, []pb.Entry{{Index: half - 1, Term: half - 1}}, false},
{half - 1, half + 1, uint64(halfe.Size() + 1), []pb.Entry{{Index: half - 1, Term: half - 1}}, false},
{half - 1, half + 1, uint64(halfe.Size() * 2), []pb.Entry{{Index: half - 1, Term: half - 1}, {Index: half, Term: half}}, false},
{half - 1, half + 2, uint64(halfe.Size() * 3), []pb.Entry{{Index: half - 1, Term: half - 1}, {Index: half, Term: half}, {Index: half + 1, Term: half + 1}}, false},
{half, half + 2, uint64(halfe.Size()), []pb.Entry{{Index: half, Term: half}}, false},
{half, half + 2, uint64(halfe.Size() * 2), []pb.Entry{{Index: half, Term: half}, {Index: half + 1, Term: half + 1}}, false},
}
for j, tt := range tests {
func() {
defer func() {
if r := recover(); r != nil {
if !tt.wpanic {
t.Errorf("%d: panic = %v, want %v: %v", j, true, false, r)
}
}
}()
g := l.slice(tt.from, tt.to, tt.limit)
if !reflect.DeepEqual(g, tt.w) {
t.Errorf("#%d: from %d to %d = %v, want %v", j, tt.from, tt.to, g, tt.w)
}
}()
}
}