Re: [GSoC] wrong patch "msg: change entity_addr_t encode/decode"

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On Wed, 8 Jun 2016, Junwang Zhao wrote:
> Hi Sage,
> 
> Write some unittest, but seems not right, see [0], give some comments
> please, I use `cout` to print the value, but I don't know where to see them.
> 
> I got a lot of other "FAIL" in the wip-addr-more branch, like:
>   ceph-detect-init/run-tox.sh
>   ceph-disk/run-tox.sh
>   test/run-rbd-unit-tests.sh
> I am wondering is this because my working environment? My laptop
> is really not very powerful, "i5-3210M CPU, 8G memory" :(
> make check is quite slow.
> 
> [0] https://github.com/zhjwpku/ceph/commit/e15a240d56c2b67a8b0906dc80650a91bff1518f

I'm traveling today and not able to replicate this yet--I'll take a look 
tomorrow.

In the meantime, though, it doesn't look like your new tests are doing 
quite what I think we need them to.  I think the important cases are:

1- make sure that any encoded entity_addr_t can be decoded as a 
entity_addrvec_t, with size 1, where item 0 matches the addr.  Can use the 
existing arrays of addrs to parse to test this.

2- make sure that in all of those cases, if we encode the entity_addrvec_t 
with features 0, and decode as an entity_addr_t, we get back the same 
entity_addr_t.

3- the addrvec size > 1 cases:

- populate an addrvec with multiple addrs where one is legacy and others 
are not, and ensure that encoding with features 0 and decoding as an addr 
gives back the legacy item.

- multiple legacy addrs with features 0 should encode the first one in the 
list

- a vec with all non-legacy addrs encoded with features 0 and decoded as 
addr should give back an addr that is not entity_addr_t() but is 
unusable/bogus.

4- the empty addrvec case:

- encode with features 0 and decoding as addr should give back 
entity_addr_t().

I think that's it?

sage


> 
> On Mon, Jun 6, 2016 at 4:28 PM, Junwang Zhao <zhjwpku@xxxxxxxxx> wrote:
> > Hi, Sage,
> >
> > Sorry I did not see your reply util now, I will work on it.
> >
> > Thanks!
> > Zhao
> >
> > On Fri, Jun 3, 2016 at 1:46 AM, Sage Weil <sage@xxxxxxxxxxxx> wrote:
> >> On Thu, 2 Jun 2016, Sage Weil wrote:
> >>> Hi Zhao,
> >>>
> >>> On Tue, 31 May 2016, Junwang Zhao wrote:
> >>> > Hi Sage & Haomai,
> >>> >
> >>> > I try to run './vstart.sh -d -x -n' to test the patches today, I got
> >>> > some error like 'wrong node', after some work, I found the
> >>> > error was introduced by this patch[0]. I change the code to
> >>> > use the legacy decode and encode, but got stuck somewhere.
> >>> >
> >>> > --- a/src/msg/msg_types.h
> >>> > +++ b/src/msg/msg_types.h
> >>> > @@ -371,7 +371,7 @@ struct entity_addr_t {
> >>> >    // broader study
> >>> >
> >>> >    void encode(bufferlist& bl, uint64_t features) const {
> >>> > -    if ((features & CEPH_FEATURE_MSG_ADDR2) == 0) {
> >>> > +    if ((features & CEPH_FEATURE_MSG_ADDR2) != 0) {
> >>> >        ::encode((__u32)0, bl);
> >>> >        ::encode(nonce, bl);
> >>> >        sockaddr_storage ss = get_sockaddr_storage();
> >>> >
> >>> >
> >>> > Can you please see the patch again and give some comments?
> >>> >
> >>> > [0]https://github.com/zhjwpku/ceph/commit/8934f038fdf28156038770e601e4a27f7a684390
> >>>
> >>> This was enough to make things work fo rme:
> >>>
> >>> diff --git a/src/msg/msg_types.h b/src/msg/msg_types.h
> >>> index 9c521e6..0da0614 100644
> >>> --- a/src/msg/msg_types.h
> >>> +++ b/src/msg/msg_types.h
> >>> @@ -199,8 +199,7 @@ WRITE_CLASS_ENCODER(ceph_sockaddr_storage)
> >>>
> >>>  struct entity_addr_t {
> >>>    typedef enum {
> >>> -    TYPE_NONE = 0,
> >>> -    TYPE_LEGACY = 1,
> >>> +    TYPE_LEGACY = 0,
> >>>    } type_t;
> >>>
> >>>    __u32 type;
> >>> @@ -211,7 +210,7 @@ struct entity_addr_t {
> >>>      sockaddr_in6 sin6;
> >>>    } u;
> >>>
> >>> -  entity_addr_t() : type(0), nonce(0) {
> >>> +  entity_addr_t() : type(TYPE_LEGACY), nonce(0) {
> >>>      memset(&u, 0, sizeof(u));
> >>>    }
> >>>    explicit entity_addr_t(const ceph_entity_addr &o) {
> >>>
> >>> but I think this is not the right fix.  I think we still want
> >>> TYPE_NONE, TYPE_LEGACY, and (soon) TYPE_MSGR2, and that the core problem
> >>> is places that are creating addrs aren't setting the type properly.  Going
> >>> to play with this a bit...
> >>
> >> I pushed a wip-addr-more branch:
> >>
> >>         https://github.com/liewegas/ceph/commits/wip-addr-more
> >>
> >> This fixes the parser to take type prefixes, default to legacy, and
> >> changes entity_addr_t() so that it renders are "-" instead of ":/0" (which
> >> was weird anyway).
> >>
> >> I think what we need next are some unit tests in test/test_addrs.cc that
> >> do things like encode a entity_addr_t with no features, decode as
> >> entity_addrvec_t, or construct varous addrvecs, encode with no features,
> >> an ensure a decode to entity_addr_t gives back the right addr from the
> >> list.
> >>
> >> sage
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