func (s *EtcdSuite) TestSetMeta(c *C) {
events := make(chan *discoverd.Event, 1)
s.state.Subscribe("a", false, discoverd.EventKindServiceMeta, events)
c.Assert(s.backend.AddService("a", nil), IsNil)
c.Assert(s.backend.StartSync(), IsNil)
// with service that doesn't exist
err := s.backend.SetServiceMeta("b", &discoverd.ServiceMeta{Data: []byte("foo")})
c.Assert(err, FitsTypeOf, NotFoundError{})
// new with wrong index
err = s.backend.SetServiceMeta("a", &discoverd.ServiceMeta{Data: []byte("foo"), Index: 1})
c.Assert(hh.IsPreconditionFailedError(err), Equals, true)
// new
meta := &discoverd.ServiceMeta{Data: []byte("foo"), Index: 0}
c.Assert(s.backend.SetServiceMeta("a", meta), IsNil)
assertMetaEvent(c, events, "a", meta)
// index=0 set with existing
err = s.backend.SetServiceMeta("a", &discoverd.ServiceMeta{Data: []byte("foo"), Index: 0})
c.Assert(hh.IsObjectExistsError(err), Equals, true)
// set with existing, valid index
meta.Data = []byte("bar")
c.Assert(s.backend.SetServiceMeta("a", meta), IsNil)
assertMetaEvent(c, events, "a", meta)
// set with existing, low index
meta.Index--
meta.Data = []byte("baz")
err = s.backend.SetServiceMeta("a", meta)
c.Assert(hh.IsPreconditionFailedError(err), Equals, true)
}
func (s *HTTPSuite) TestServiceMeta(c *C) {
srv := s.client.Service("a")
events := make(chan *discoverd.Event)
stream, err := srv.Watch(events)
c.Assert(err, IsNil)
defer stream.Close()
assertEvent(c, events, "a", discoverd.EventKindCurrent, nil)
// Get non-existent meta
_, err = srv.GetMeta()
c.Assert(discoverd.IsNotFound(err), Equals, true)
// Set new meta
meta := &discoverd.ServiceMeta{Data: []byte("1")}
c.Assert(srv.SetMeta(meta), IsNil)
c.Assert(meta.Index > 0, Equals, true)
assertMetaEvent(c, events, "a", meta)
res, err := srv.GetMeta()
c.Assert(err, IsNil)
c.Assert(res, DeepEquals, meta)
// Set meta on non-existent service
err = s.client.Service("foo").SetMeta(meta)
c.Assert(discoverd.IsNotFound(err), Equals, true, Commentf("err = %#v", err))
// Update meta
meta.Data = []byte("2")
c.Assert(srv.SetMeta(meta), IsNil)
c.Assert(meta.Index > res.Index, Equals, true, Commentf("old = %d, new = %d", res.Index, meta.Index))
assertMetaEvent(c, events, "a", meta)
// Update meta with wrong index
meta.Index--
err = srv.SetMeta(meta)
c.Assert(err, NotNil)
c.Assert(hh.IsPreconditionFailedError(err), Equals, true)
}