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From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
To: Andrew Cooper <andrew.cooper3@citrix.com>,
	Jonathan Davies <jonathan.davies@citrix.com>,
	xen-devel@lists.xenproject.org
Cc: Jon Ludlam <jonathan.ludlam@citrix.com>,
	Euan Harris <euan.harris@citrix.com>,
	Dave Scott <dave@recoil.org>
Subject: Re: [PATCH 3/7] oxenstored: refactor request processing
Date: Thu, 24 Mar 2016 19:57:30 -0400	[thread overview]
Message-ID: <56F47EEA.3070103@oracle.com> (raw)
In-Reply-To: <56F46EFA.9060204@citrix.com>

On 03/24/2016 06:49 PM, Andrew Cooper wrote:
> On 24/03/2016 22:22, Boris Ostrovsky wrote:
>> On 03/17/2016 01:51 PM, Jonathan Davies wrote:
>>> Encapsulate the request in a record that is passed from do_input to
>>> process_packet and input_handle_error.
>>>
>>> This will be helpful when keeping track of the requests made as part
>>> of a
>>> transaction.
>>>
>>> Signed-off-by: Jonathan Davies <jonathan.davies@citrix.com>
>>> Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
>>> Reviewed-by: Jon Ludlam <jonathan.ludlam@citrix.com>
>>> Reviewed-by: Euan Harris <euan.harris@citrix.com>
>>> ---
>>>    tools/ocaml/xenstored/process.ml |   15 ++++++++++-----
>>>    1 file changed, 10 insertions(+), 5 deletions(-)
>>>
>>> diff --git a/tools/ocaml/xenstored/process.ml
>>> b/tools/ocaml/xenstored/process.ml
>>> index 7a73669..c92bec7 100644
>>> --- a/tools/ocaml/xenstored/process.ml
>>> +++ b/tools/ocaml/xenstored/process.ml
>>> @@ -344,11 +344,11 @@ let function_of_type ty =
>>>        | Xenbus.Xb.Op.Invalid           -> reply_ack do_error
>>>        | _                              -> reply_ack do_error
>>>    -let input_handle_error ~cons ~doms ~fct ~ty ~con ~t ~rid ~data =
>>> +let input_handle_error ~cons ~doms ~fct ~con ~t ~req =
>>>        let reply_error e =
>>>            Packet.Error e in
>>>        try
>>> -        fct con t doms cons data
>>> +        fct con t doms cons req.Packet.data
>>>        with
>>>        | Define.Invalid_path          -> reply_error "EINVAL"
>>>        | Define.Already_exist         -> reply_error "EEXIST"
>>> @@ -370,7 +370,10 @@ let input_handle_error ~cons ~doms ~fct ~ty ~con
>>> ~t ~rid ~data =
>>>    (**
>>>     * Nothrow guarantee.
>>>     *)
>>> -let process_packet ~store ~cons ~doms ~con ~tid ~rid ~ty ~data =
>>> +let process_packet ~store ~cons ~doms ~con ~req =
>>> +    let ty = req.Packet.ty in
>>> +    let tid = req.Packet.tid in
>>> +    let rid = req.Packet.rid in
>>>        try
>>>            let fct = function_of_type ty in
>>>            let t =
>>> @@ -379,7 +382,7 @@ let process_packet ~store ~cons ~doms ~con ~tid
>>> ~rid ~ty ~data =
>>>                else
>>>                    Connection.get_transaction con tid
>>>                in
>>> -        let response = input_handle_error ~cons ~doms ~fct ~ty ~con
>>> ~t ~rid ~data in
>>> +        let response = input_handle_error ~cons ~doms ~fct ~con ~t
>>> ~req in
>>>              (* Put the response on the wire *)
>>>            send_response ty con t rid response
>>> @@ -412,11 +415,13 @@ let do_input store cons doms con =
>>>        if newpacket then (
>>>            let packet = Connection.pop_in con in
>>>            let tid, rid, ty, data = Xenbus.Xb.Packet.unpack packet in
>>> +        let req = {Packet.tid; Packet.rid; Packet.ty; Packet.data} in
>>> +
>> I think this change breaks the build with older ocaml versions:
>>
>> root@haswell> ocamlopt -v
>> The OCaml native-code compiler, version 4.00.1
>> Standard library directory: /usr/lib64/ocaml
>> root@haswell> ocamlopt -g -ccopt "    " -dtypes -I
>> /root/tmp/xen/tools/ocaml/xenstored/../libs/xb -I
>> /root/tmp/xen/tools/ocaml/xenstored/../libs/mmap -I
>> /root/tmp/xen/tools/ocaml/xenstored/../libs/xc -I
>> /root/tmp/xen/tools/ocaml/xenstored/../libs/eventchn -cc gcc -w F
>> -warn-error F -c -o process.cmx process.ml
>> root@haswell>
>>
>>
>> root@ovs104> ocamlopt -v
>> The Objective Caml native-code compiler, version 3.11.2
>> Standard library directory: /usr/lib64/ocaml
>> root@ovs104> ocamlopt -g -ccopt "    " -dtypes -I
>> /root/tmp/xen/tools/ocaml/xenstored/../libs/xb -I
>> /root/tmp/xen/tools/ocaml/xenstored/../libs/mmap -I
>> /root/tmp/xen/tools/ocaml/xenstored/../libs/xc -I
>> /root/tmp/xen/tools/ocaml/xenstored/../libs/eventchn -cc gcc -w F
>> -warn-error F -c -o process.cmx process.ml
>> File "process.ml", line 487, characters 23-24:
>> Error: Syntax error
>> root@ovs104>
>>
>> I don't know much about ocaml (OK, I know *nothing* about ocaml) so I
>> can't say what exactly might be wrong.
> Could you perhaps try this instead?
>
> let req = {tid = Packet.tid; rid = Packet.rid; ty = Packet.ty; data =
> Packet.data} in
>
> It is most likely that the older version of Ocaml can't infer the order
> of fields.
>
> ~Andrew


No, it now gives me "Error: Unbound record field label tid"

-boris

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  reply	other threads:[~2016-03-24 23:57 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-17 17:51 [PATCH 0/7] oxenstored: improve transaction conflict handling Jonathan Davies
2016-03-17 17:51 ` [PATCH 1/7] oxenstored: refactor putting response on wire Jonathan Davies
2016-03-17 17:51 ` [PATCH 2/7] oxenstored: remove some unused parameters Jonathan Davies
2016-03-17 17:51 ` [PATCH 3/7] oxenstored: refactor request processing Jonathan Davies
2016-03-24 22:22   ` Boris Ostrovsky
2016-03-24 22:49     ` Andrew Cooper
2016-03-24 23:57       ` Boris Ostrovsky [this message]
2016-03-29  9:08         ` Jonathan Davies
2016-03-29 12:45           ` Boris Ostrovsky
2016-03-29 16:38           ` Wei Liu
2016-03-29 19:41             ` David Scott
2016-03-30 15:46               ` Jonathan Davies
2016-03-30 15:53                 ` Wei Liu
2016-03-17 17:51 ` [PATCH 4/7] oxenstored: keep track of each transaction's operations Jonathan Davies
2016-03-17 17:51 ` [PATCH 5/7] oxenstored: move functions that process simple operations Jonathan Davies
2016-03-17 17:51 ` [PATCH 6/7] oxenstored: replay transaction upon conflict Jonathan Davies
2016-03-17 17:51 ` [PATCH 7/7] oxenstored: log request and response during transaction replay Jonathan Davies
2016-03-18 14:33 ` [PATCH 0/7] oxenstored: improve transaction conflict handling Konrad Rzeszutek Wilk
2016-03-18 16:21   ` Jonathan Davies
2016-03-18 16:36   ` Wei Liu
2016-03-19 11:30     ` David Scott

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