[RFC] async source3/rpc_server

[David Disseldorp]

Hi,

In order to properly implement a File Server Remote Shadow-copy Protocol
(MS-FSRVP) RPC server, snapshot/shadow-copy operations should be handled
asynchronously from PDU processing through to VFS request dispatch.

Working towards this, I've made a some small changes to carry two types
of RPC server command arrays (synchronous and asynchronous) under
api_struct. See pull request at the bottom of this mail.

IDLs are flagged sync or async at build time, with sync builds compiling
into the existing interface via Pidl/Samba3/ServerNDR.pm:
  struct api_struct_sync {
          const char *name;
          uint8 opnum;
          bool (*fn) (struct pipes_struct *);
  };

Async builds will compile into send/recv hooks with a new
--samba3-ndr-server-async pidl option:
  struct api_struct_async {
          const char *name;
          uint8 opnum;
          struct tevent_req *(*fn_send)(TALLOC_CTX *,
                                        struct tevent_context *,
                                        struct pipes_struct *);
          NTSTATUS (*fn_recv)(struct tevent_req *);
  };

Existing synchronous server IDL will remain so for the time being.
The same code path will be shared between sync and async backends
up to the point of gen_ndr srv dispatch. i.e. api_rpcTNP for
rpc_server/srv_pipe.c.

Does this approach sound sane?

One other possibility would be to have asynchronicity defined per
operation, rather than requiring all operations to be either sync or
async for a given IDL.

Cheers, David


The following changes since commit 0d5d45c2dffbe6f630ecc8d6cab8501dc3e07214:

  s4-s3upgrade: print the error message from passdb.error exceptions (2012-04-24 04:34:44 +0200)

are available in the git repository at:
  git://git.samba.org/ddiss/samba.git rpc_server_async_wip

David Disseldorp (1):
      source3/rpc_server: add async hooks to api_struct

 pidl/lib/Parse/Pidl/Samba3/ServerNDR.pm |   17 ++++++++----
 source3/rpc_server/rpc_ncacn_np.c       |   25 ++++++++++++------
 source3/rpc_server/rpc_pipes.h          |   23 ++++++++++++++--
 source3/rpc_server/srv_pipe.c           |   43 +++++++++++++++++++-----------
 source3/rpc_server/srv_pipe_internal.h  |    2 -
 source3/rpc_server/srv_pipe_register.c  |   24 +++-------------
 source3/rpc_server/srv_pipe_register.h  |    2 +-
 source3/winbindd/winbindd_dual_ndr.c    |   15 ++++++----
 8 files changed, 90 insertions(+), 61 deletions(-)