[phosphor-virtual-sensor] get sensor service fail

[Nan Zhou]

Hi Ed,

Thanks for your reply.

Alan and I were talking about what attribute we should use for "the time
that an event occurred", "Created" or "EventTimestamp". Both attributes in
the Redfish schema are optional, my understanding after reading the
description was that "Created" is when the LogEntry gets created in the
LogEntryCollection in the web server (BmcWeb); IIUC, in BmcWeb, new Log
Entries are not created until they get queried; "EventTimestamp" on the
other hand is when an event originally occurred.

The context is that we are implementing both the PULL model and PUSH model
of Redfish POST codes and Host Serial Logs, and we care about when events
occurred in both models.  In the PUSH model, the web server will send an
array of "Event", in which there is an "EventTimestamp" attribute that we
can use for each event. In the PULL model, we will query the
LogEntryCollection in LogService, and currently, there is only "Created"
but not "EventTimestamp" in BmcWeb. So we are sending this email to ask for
comments.

>
> > We think that using “EventTimestamp” will be more suitable than
> “Created” in LogServices.
> Why?  Can you give more details here on what you're trying to accomplish?

We are talking about the following three options,

1. change all the current "Created" attributes in BmcWeb LogService to
"EventTimestamp"
2. keep "Created" as is; add a new attribute "EventTimestamp"
3. keep everything as is; use "Created" to represent "the time that an
event occurred"

We are fine with either of the three options. The email is to ask the
upstream and look for opinions from people.

Thanks,
Nan

On Thu, Apr 8, 2021 at 9:36 AM Ed Tanous <ed at tanous.net> wrote:

> On Thu, Apr 8, 2021 at 7:01 AM Alan Kuo (郭振維) <Alan_Kuo at quantatw.com>
> wrote:
> >
> > Hi all,
> >
> >
> >
> > In the current implementation of bmcweb LogServices, the time of the
> "Created" property is the time when the event is generated, which does not
> match the description of the redfish schema. The "Created" property means
> the date and time when the log entry was created.
>
> It should be noted, Created has been present since 1.0.0 of LogEntry,
> EventTimestamp was added in LogEntry v1.1.0.  Based on the
> descriptions, it's not clear to me what the intended difference is,
> seeing as how they're both of type Edm.DateTimeOffset.  Based on the
> description, the two would be identical on an OpenBMC system, the
> LogEntry is "Created" at the same time it occurs.
>
> >
> > We think that using “EventTimestamp” will be more suitable than
> “Created” in LogServices.
>
> Why?  Can you give more details here on what you're trying to accomplish?
>
> >
> >
> >
> > Could you give me some suggestion ? Or am I misunderstanding the
> definition of schema?
>
> This is probably a better question for the Redfish forum, unless
> there's documentation on what the intended difference between those
> two parameters are.
>
> >
> >
> >
> > Here is an example:
> >
> > {
> >
> >       "@odata.id":
> "/redfish/v1/Systems/system/LogServices/PostCodes/Entries/B5-83",
> >
> >       "@odata.type": "#LogEntry.v1_4_0.LogEntry",
> >
> >       "Created": "1970-01-01T00:01:43+00:00",    <=  It should be
> EventTimestamp
> >
> >       "EntryType": "Event",
> >
> >       "Id": "B5-83",
> >
> >       "Message": "Boot Count: 1: TS Offset: 65.4769; POST Code: 0x01",
> >
> >       "MessageArgs": [
> >
> >         "1",
> >
> >         "65.4769",
> >
> >         "0x01"
> >
> >       ],
> >
> >       "MessageId": "OpenBMC.0.1.BIOSPOSTCode",
> >
> >       "Name": "POST Code Log Entry",
> >
> >       "Severity": "OK"
> >
> > }
> >
> >
> >
> > Thanks,
> >
> > Alan
> >
> >
> >
> > From: openbmc <openbmc-bounces+alan_kuo=quantatw.com at lists.ozlabs.org>
> On Behalf Of Harvey Wu (吳崇維)
> > Sent: Monday, March 29, 2021 5:14 PM
> > To: openbmc at lists.ozlabs.org
> > Cc: Duke Du (杜祥嘉) <Duke.Du at quantatw.com>; Fran Hsu (徐誌謙) <
> Fran.Hsu at quantatw.com>; George Hung (洪忠敬) <George.Hung at quantatw.com>
> > Subject: [phosphor-virtual-sensor] get sensor service fail
> >
> >
> >
> > Hi All,
> >
> >
> >
> >         In current phosphor-virtual-sensor, the function getService will
> return empty string only when catch error name =
> “xyz.openbmc_project.Common.Error.ResourceNotFound” (
> https://github.com/openbmc/phosphor-virtual-sensor/blob/master/dbusUtils.hpp#L37
> ).
> >
> >         But in my system, when bus call didn’t get sensor service, the
> exception name will be “org.freedesktop.DBus.Error.FileNotFound”, and then
> service will be get failed.
> >
> >         It seems need to modified the origin condition or add another
> elseif condition. Do I misunderstand something?
> >
> >
> >
> >
> >
> > Thanks.
> >
> >
> >
> > Harvey Wu
> >
> > Email: Harvey.Wu at quantatw.com
> >
> > Ext: 17408
> >
> >
>
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