<div dir="ltr">Hi team,<br><br>We have drafted a proposal for "<span style="font-family:Calibri,sans-serif;font-size:14.6667px">Using default values in D-Bus properties to indicate errors" </span> as <span class="gmail-ui-provider gmail-bcp gmail-bcq gmail-c gmail-d gmail-e gmail-f gmail-g gmail-h gmail-i gmail-j gmail-k gmail-l gmail-m gmail-n gmail-o gmail-p gmail-q gmail-r gmail-s gmail-t gmail-bcr gmail-bcs gmail-w gmail-x gmail-y gmail-z gmail-ab gmail-ac gmail-ae gmail-af gmail-ag gmail-ah gmail-ai gmail-aj gmail-ak" dir="ltr">communicated in previous mail.</span><br><br>Issue with Existing Implementation:<br>Error handling is not implemented in the existing bmcweb source. The values fetched from D-Bus are used directly in the Redfish response, except for some properties. T<span class="gmail-ui-provider gmail-bcp gmail-bcq gmail-c gmail-d gmail-e gmail-f gmail-g gmail-h gmail-i gmail-j gmail-k gmail-l gmail-m gmail-n gmail-o gmail-p gmail-q gmail-r gmail-s gmail-t gmail-bcr gmail-bcs gmail-w gmail-x gmail-y gmail-z gmail-ab gmail-ac gmail-ae gmail-af gmail-ag gmail-ah gmail-ai gmail-aj gmail-ak" dir="ltr">here was no way to represent error for a given data type on Redfish.</span><br><br>New Implementation Proposal:<br>We plan to handle errors from backend D-Bus services in bmcweb using a custom data type class. We will implement a helper class to create a new data type called mydatatype_t. An object of this class will be created with the D-Bus property value as input. This object will be assigned to the JSON response using the assignment operator. This assignment operation will invoke the to_json function with the mydatatype_t object, where D-Bus values will be validated based on their data types.<br><br>Data Types and Default Values:<br>The following values will be set on the D-Bus property in case of an error, based on the data type. In Redfish, we will validate these properties. If the D-Bus property value matches the error value, we will update the property value as null in the Redfish JSON response; otherwise, the corresponding value on D-Bus will be used.<br><br><table class="gmail-MsoNormalTable" border="0" cellspacing="0" cellpadding="0" style="border-collapse:collapse">
<thead>
<tr>
<td valign="top" style="border:1pt solid black;padding:5pt">
<p class="MsoNormal" align="center" style="margin:0in;text-align:center;line-height:normal;font-size:10.5pt;font-family:Calibri,sans-serif"><b><span style="font-size:10pt;font-family:"Courier New";color:black">D-Bus</span></b><b><span style="font-size:12pt;font-family:"Times New Roman",serif"></span></b></p>
<p class="MsoNormal" align="center" style="margin:0in;text-align:center;line-height:normal;font-size:10.5pt;font-family:Calibri,sans-serif"><b><span style="font-size:10pt;font-family:"Courier New";color:black">data type</span></b><b><span style="font-size:12pt;font-family:"Times New Roman",serif"></span></b></p>
</td>
<td valign="top" style="border-top:1pt solid black;border-right:1pt solid black;border-bottom:1pt solid black;border-left:none;padding:5pt">
<p class="MsoNormal" align="center" style="margin:0in;text-align:center;line-height:normal;font-size:10.5pt;font-family:Calibri,sans-serif"><b><span style="font-size:10pt;font-family:"Courier New";color:black">Value of the D-Bus Property incase of Error </span></b><b><span style="font-size:12pt;font-family:"Times New Roman",serif"></span></b></p>
</td>
<td valign="top" style="border-top:1pt solid black;border-right:1pt solid black;border-bottom:1pt solid black;border-left:none;padding:5pt">
<p class="MsoNormal" align="center" style="margin:0in;text-align:center;line-height:normal;font-size:10.5pt;font-family:Calibri,sans-serif"><b><span style="font-size:10pt;font-family:"Courier New";color:black">Property value as seen on
Redfish </span></b><b><span style="font-size:12pt;font-family:"Times New Roman",serif"></span></b></p>
</td>
</tr>
<tr>
<td valign="top" style="border-right:1pt solid black;border-bottom:1pt solid black;border-left:1pt solid black;border-top:none;padding:5pt">
<p class="MsoNormal" align="center" style="margin:0in;text-align:center;line-height:normal;font-size:10.5pt;font-family:Calibri,sans-serif"><span style="font-size:10pt;font-family:"Courier New";color:black">INT16</span><b><span style="font-size:12pt;font-family:"Times New Roman",serif"></span></b></p>
</td>
<td valign="top" style="border-top:none;border-left:none;border-bottom:1pt solid black;border-right:1pt solid black;padding:5pt">
<p class="MsoNormal" align="center" style="margin:0in;text-align:center;line-height:normal;font-size:10.5pt;font-family:Calibri,sans-serif"><span style="font-size:10pt;font-family:"Courier New";color:black;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial">INT_MAX</span><b><span style="font-size:12pt;font-family:"Times New Roman",serif"></span></b></p>
</td>
<td valign="top" style="border-top:none;border-left:none;border-bottom:1pt solid black;border-right:1pt solid black;padding:5pt">
<p class="MsoNormal" align="center" style="margin:0in;text-align:center;line-height:normal;font-size:10.5pt;font-family:Calibri,sans-serif"><span style="font-size:10pt;font-family:"Courier New";color:black">null</span></p>
</td>
</tr>
<tr>
<td valign="top" style="border-right:1pt solid black;border-bottom:1pt solid black;border-left:1pt solid black;border-top:none;padding:5pt">
<p class="MsoNormal" align="center" style="margin:0in;text-align:center;line-height:normal;font-size:10.5pt;font-family:Calibri,sans-serif"><span style="font-size:10pt;font-family:"Courier New";color:black">UINT16</span><b><span style="font-size:12pt;font-family:"Times New Roman",serif"></span></b></p>
</td>
<td valign="top" style="border-top:none;border-left:none;border-bottom:1pt solid black;border-right:1pt solid black;padding:5pt">
<p class="MsoNormal" align="center" style="margin:0in;text-align:center;line-height:normal;font-size:10.5pt;font-family:Calibri,sans-serif"><span style="font-size:10pt;font-family:"Courier New";color:black;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial">UINT_MAX</span><b><span style="font-size:12pt;font-family:"Times New Roman",serif"></span></b></p>
</td>
<td valign="top" style="border-top:none;border-left:none;border-bottom:1pt solid black;border-right:1pt solid black;padding:5pt">
<p class="MsoNormal" align="center" style="margin:0in;text-align:center;line-height:normal;font-size:10.5pt;font-family:Calibri,sans-serif"><span style="color:rgb(0,0,0);font-family:"Courier New";font-size:13.3333px">null</span><br></p>
</td>
</tr>
<tr>
<td valign="top" style="border-right:1pt solid black;border-bottom:1pt solid black;border-left:1pt solid black;border-top:none;padding:5pt">
<p class="MsoNormal" align="center" style="margin:0in;text-align:center;line-height:normal;font-size:10.5pt;font-family:Calibri,sans-serif"><span style="font-size:10pt;font-family:"Courier New";color:black">INT32</span><b><span style="font-size:12pt;font-family:"Times New Roman",serif"></span></b></p>
</td>
<td valign="top" style="border-top:none;border-left:none;border-bottom:1pt solid black;border-right:1pt solid black;padding:5pt">
<p class="MsoNormal" align="center" style="margin:0in;text-align:center;line-height:normal;font-size:10.5pt;font-family:Calibri,sans-serif"><span style="font-size:10pt;font-family:"Courier New";color:black;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial">LONG_MAX</span><b><span style="font-size:12pt;font-family:"Times New Roman",serif"></span></b></p>
</td>
<td valign="top" style="border-top:none;border-left:none;border-bottom:1pt solid black;border-right:1pt solid black;padding:5pt">
<p class="MsoNormal" align="center" style="margin:0in;text-align:center;line-height:normal;font-size:10.5pt;font-family:Calibri,sans-serif"><span style="color:rgb(0,0,0);font-family:"Courier New";font-size:13.3333px">null</span><br></p>
</td>
</tr>
<tr>
<td valign="top" style="border-right:1pt solid black;border-bottom:1pt solid black;border-left:1pt solid black;border-top:none;padding:5pt">
<p class="MsoNormal" align="center" style="margin:0in;text-align:center;line-height:normal;font-size:10.5pt;font-family:Calibri,sans-serif"><span style="font-size:10pt;font-family:"Courier New";color:black">UINT32</span><b><span style="font-size:12pt;font-family:"Times New Roman",serif"></span></b></p>
</td>
<td valign="top" style="border-top:none;border-left:none;border-bottom:1pt solid black;border-right:1pt solid black;padding:5pt">
<p class="MsoNormal" align="center" style="margin:0in;text-align:center;line-height:normal;font-size:10.5pt;font-family:Calibri,sans-serif"><span style="font-size:10pt;font-family:"Courier New";color:black;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial">ULONG_MAX</span><b><span style="font-size:12pt;font-family:"Times New Roman",serif"></span></b></p>
</td>
<td valign="top" style="border-top:none;border-left:none;border-bottom:1pt solid black;border-right:1pt solid black;padding:5pt">
<p class="MsoNormal" align="center" style="margin:0in;text-align:center;line-height:normal;font-size:10.5pt;font-family:Calibri,sans-serif"><span style="color:rgb(0,0,0);font-family:"Courier New";font-size:13.3333px">null</span><br></p>
</td>
</tr>
<tr>
<td valign="top" style="border-right:1pt solid black;border-bottom:1pt solid black;border-left:1pt solid black;border-top:none;padding:5pt">
<p class="MsoNormal" align="center" style="margin:0in;text-align:center;line-height:normal;font-size:10.5pt;font-family:Calibri,sans-serif"><span style="font-size:10pt;font-family:"Courier New";color:black">INT64</span><b><span style="font-size:12pt;font-family:"Times New Roman",serif"></span></b></p>
</td>
<td valign="top" style="border-top:none;border-left:none;border-bottom:1pt solid black;border-right:1pt solid black;padding:5pt">
<p class="MsoNormal" align="center" style="margin:0in;text-align:center;line-height:normal;font-size:10.5pt;font-family:Calibri,sans-serif"><span style="font-size:10pt;font-family:"Courier New";color:black;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial">LLONG_MAX</span><b><span style="font-size:12pt;font-family:"Times New Roman",serif"></span></b></p>
</td>
<td valign="top" style="border-top:none;border-left:none;border-bottom:1pt solid black;border-right:1pt solid black;padding:5pt">
<p class="MsoNormal" align="center" style="margin:0in;text-align:center;line-height:normal;font-size:10.5pt;font-family:Calibri,sans-serif"><span style="color:rgb(0,0,0);font-family:"Courier New";font-size:13.3333px">null</span><br></p>
</td>
</tr>
<tr>
<td valign="top" style="border-right:1pt solid black;border-bottom:1pt solid black;border-left:1pt solid black;border-top:none;padding:5pt">
<p class="MsoNormal" align="center" style="margin:0in;text-align:center;line-height:normal;font-size:10.5pt;font-family:Calibri,sans-serif"><span style="font-size:10pt;font-family:"Courier New";color:black">UINT64</span><b><span style="font-size:12pt;font-family:"Times New Roman",serif"></span></b></p>
</td>
<td valign="top" style="border-top:none;border-left:none;border-bottom:1pt solid black;border-right:1pt solid black;padding:5pt">
<p class="MsoNormal" align="center" style="margin:0in;text-align:center;line-height:normal;font-size:10.5pt;font-family:Calibri,sans-serif"><span style="font-size:10pt;font-family:"Courier New";color:black;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial">ULLONG_MAX</span><b><span style="font-size:12pt;font-family:"Times New Roman",serif"></span></b></p>
</td>
<td valign="top" style="border-top:none;border-left:none;border-bottom:1pt solid black;border-right:1pt solid black;padding:5pt">
<p class="MsoNormal" align="center" style="margin:0in;text-align:center;line-height:normal;font-size:10.5pt;font-family:Calibri,sans-serif"><span style="color:rgb(0,0,0);font-family:"Courier New";font-size:13.3333px">null</span><br></p>
</td>
</tr>
<tr>
<td valign="top" style="border-right:1pt solid black;border-bottom:1pt solid black;border-left:1pt solid black;border-top:none;padding:5pt">
<p class="MsoNormal" align="center" style="margin:0in;text-align:center;line-height:normal;font-size:10.5pt;font-family:Calibri,sans-serif"><span style="font-size:10pt;font-family:"Courier New";color:black">DOUBLE</span><b><span style="font-size:12pt;font-family:"Times New Roman",serif"></span></b></p>
</td>
<td valign="top" style="border-top:none;border-left:none;border-bottom:1pt solid black;border-right:1pt solid black;padding:5pt">
<p class="MsoNormal" align="center" style="margin:0in;text-align:center;line-height:normal;font-size:10.5pt;font-family:Calibri,sans-serif"><a href="http://en.cppreference.com/w/cpp/types/numeric_limits"><span style="font-size:9pt;font-family:"Courier New";color:black">std::numeric_limits</span></a><span style="font-size:9pt;font-family:"Courier New";color:black"><T>::quiet_NaN()</span><b><span style="font-size:12pt;font-family:"Times New Roman",serif"></span></b></p>
</td>
<td valign="top" style="border-top:none;border-left:none;border-bottom:1pt solid black;border-right:1pt solid black;padding:5pt">
<p class="MsoNormal" align="center" style="margin:0in;text-align:center;line-height:normal;font-size:10.5pt;font-family:Calibri,sans-serif"><span style="color:rgb(0,0,0);font-family:"Courier New";font-size:13.3333px">null</span><br></p>
</td>
</tr>
<tr>
<td valign="top" style="border-right:1pt solid black;border-bottom:1pt solid black;border-left:1pt solid black;border-top:none;padding:5pt">
<p class="MsoNormal" align="center" style="margin:0in;text-align:center;line-height:normal;font-size:10.5pt;font-family:Calibri,sans-serif"><span style="font-size:10pt;font-family:"Courier New";color:black">STRING</span><b><span style="font-size:12pt;font-family:"Times New Roman",serif"></span></b></p>
</td>
<td valign="top" style="border-top:none;border-left:none;border-bottom:1pt solid black;border-right:1pt solid black;padding:5pt">
<p class="MsoNormal" align="center" style="margin:0in;text-align:center;line-height:normal;font-size:10.5pt;font-family:Calibri,sans-serif"><span style="font-size:10pt;font-family:"Courier New";color:black;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial">BE_ERROR-XXX</span><span style="font-size:12pt;font-family:"Times New Roman",serif"></span></p>
</td>
<td valign="top" style="border-top:none;border-left:none;border-bottom:1pt solid black;border-right:1pt solid black;padding:5pt">
<p class="MsoNormal" align="center" style="margin:0in;text-align:center;line-height:normal;font-size:10.5pt;font-family:Calibri,sans-serif"><span style="color:rgb(0,0,0);font-family:"Courier New";font-size:13.3333px">null</span><br></p>
</td>
</tr>
<tr>
<td valign="top" style="border-right:1pt solid black;border-bottom:1pt solid black;border-left:1pt solid black;border-top:none;padding:5pt">
<p class="MsoNormal" align="center" style="margin:0in;text-align:center;line-height:normal;font-size:10.5pt;font-family:Calibri,sans-serif"><span style="font-size:10pt;font-family:"Courier New";color:black">BOOL</span><b><span style="font-size:12pt;font-family:"Times New Roman",serif"></span></b></p>
</td>
<td valign="top" style="border-top:none;border-left:none;border-bottom:1pt solid black;border-right:1pt solid black;padding:5pt">
<p class="MsoNormal" align="center" style="margin:0in;text-align:center;line-height:normal;font-size:10.5pt;font-family:Calibri,sans-serif"><span style="font-size:10pt;font-family:"Courier New";color:black;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial">uint8_t
<br>
{0–false , 1–true, <br>
others- error}</span><b><span style="font-size:12pt;font-family:"Times New Roman",serif"></span></b></p>
</td>
<td valign="top" style="border-top:none;border-left:none;border-bottom:1pt solid black;border-right:1pt solid black;padding:5pt">
<p class="MsoNormal" align="center" style="margin:0in;text-align:center;line-height:normal;font-size:10.5pt;font-family:Calibri,sans-serif"><span style="color:rgb(0,0,0);font-family:"Courier New";font-size:13.3333px">null</span><br></p>
</td>
</tr>
</thead>
</table><br><span class="gmail-ui-provider gmail-bcp gmail-bcq gmail-c gmail-d gmail-e gmail-f gmail-g gmail-h gmail-i gmail-j gmail-k gmail-l gmail-m gmail-n gmail-o gmail-p gmail-q gmail-r gmail-s gmail-t gmail-bcr gmail-bcs gmail-w gmail-x gmail-y gmail-z gmail-ab gmail-ac gmail-ae gmail-af gmail-ag gmail-ah gmail-ai gmail-aj gmail-ak" dir="ltr">In case of error conditions Redfish will report "null" for a property irrespective of the data type.</span><br><br><div>For error validation, we will implement a custom class, which will facilitate error validation for D-Bus values. In instances of errors, a null value will be allocated to the JSON response. Example for the uint16_t data type.<br></div><div><br></div><div><img src="cid:ii_llz2xobr2" alt="image.png" width="188" height="17" style="margin-right: 0px;"><br></div><div><br><img src="cid:ii_llz2fns20" alt="image.png" style="margin-right: 0px;" width="472" height="34"><br><br>For more implementation details please refer the following gerrit link, we implemented it for redfish URI /redfish/v1/Systems/<str>/Memory/<str>/.<div><a href="https://gerrit.openbmc.org/c/openbmc/bmcweb/+/66368">https://gerrit.openbmc.org/c/openbmc/bmcweb/+/66368</a><br><br>Your feedback and insights are greatly appreciated.<br><br>Thanks,<br>Chandrasekhar T.<br></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Aug 4, 2023 at 12:37 PM Shakeeb Pasha <<a href="mailto:shakeebbk@gmail.com">shakeebbk@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div dir="ltr"><div class="gmail_default" style="font-size:large">Thanks Joseph for the response.</div><div class="gmail_default" style="font-size:large"><span style="font-size:small">>> I didn't see anyone else answer this. Is your question about how to</span><br style="font-size:small"><span style="font-size:small">>> architect or design your D-Bus interfaces? Is the reference the BMCWeb</span><br style="font-size:small"><span style="font-size:small">>> merely to provide context as a consumer of these D-Bus services? I</span><br style="font-size:small"><span style="font-size:small">>> assume so.</span><br style="font-size:small">Question is two pronged, one we wanted to know the best way to propagate error from dbus to bmcweb.</div><div class="gmail_default"><font size="4">Options we tried:</font></div><div class="gmail_default"><font size="4">1. Have handlers of each property throw an exception if there was an error. But this did not work well with current bmcweb implementation(get all method call), as it would lead to the entire resource not getting populated even if we have one property failing.</font></div><div class="gmail_default"><font size="4">2. Implement one additional associated rc property - and do the error handling bmcweb by looking at that, but this doubled up the number of properties on dbus.</font></div><div class="gmail_default"><font size="4">3. Use "default values" per property data type, but this would fail for extreme cases like if the property is u32, and if the default value used was INT_MAX, then it breaks when the property could take value 0xFFFFFFFF as valid value.</font></div><div class="gmail_default"><font size="4">So the query here was to check if any preference from above options or hear any new approaches as well.</font></div><div class="gmail_default"><font size="4"><br></font></div><div class="gmail_default"><font size="4">The second query was about how to represent this error(per property error) on redfish, our proposal for now is to return "NULL" for any property that might be failing at the backend. Any thoughts on this approach?</font></div><div class="gmail_default"><font size="4"><br></font><span style="font-size:small">>> I don't have any special insights. Are you looking to follow a design</span><br style="font-size:small"><span style="font-size:small">>> pattern? Are you looking for direction from the BMCWeb maintainers?</span><br></div><div class="gmail_default"><span style="font-size:small"><br></span></div><div class="gmail_default" style="font-size:large">Yes, we are working on a design pattern proposal and will publish it here for review.</div><div class="gmail_default" style="font-size:large">It would be great if we could get some directions/inputs from the maintainers as well.</div><div class="gmail_default" style="font-size:large"><br></div><div class="gmail_default" style="font-size:large">Thanks,</div><div class="gmail_default" style="font-size:large">Shakeeb</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Aug 3, 2023 at 10:33 PM Joseph Reynolds <<a href="mailto:jrey@linux.ibm.com" target="_blank">jrey@linux.ibm.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">On 7/20/23 2:04 AM, chandu chanti wrote:<br>
> Hi Team, We are planning to handle errors from backend services in bmc <br>
> web. We are considering the following approaches to implement it, but <br>
> we are facing some issues. please provide your inputs. 1 . Using <br>
> exceptions in our backend D-Bus service<br>
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> Hi Team,<br>
><br>
> We are planning to handle errors from backend services in bmc web. We <br>
> are considering the following approaches to implement it, but we are <br>
> facing some issues. please provide your inputs.<br>
><br>
<br>
<span class="gmail_default" style="font-size:large"></span>I didn't see anyone else answer this. Is your question about how to <br>
architect or design your D-Bus interfaces? Is the reference the BMCWeb <br>
merely to provide context as a consumer of these D-Bus services? I <br>
assume so.<br>
<br>
I don't have any special insights. Are you looking to follow a design <br>
pattern? Are you looking for direction from the BMCWeb maintainers?<br>
<br>
Joseph<br>
<br>
> 1 . Using exceptions in our backend D-Bus service by throwing <br>
> exceptions in the D-Bus property get handlers. It works fine for the <br>
> Get property method call. However, when using the Get All method call, <br>
> if one property fails, an error is returned without checking the other <br>
> properties. Is there a way to implement exceptions in GetAll so that <br>
> even if one property fails, we can still fetch the remaining properties.<br>
><br>
> 2. Using default values in D-Bus properties to indicate errors. Is <br>
> there a reference implementation available for setting default values <br>
> for string and integer data types in bmc web, similar to the <br>
> implementation of NaN (default value) for the double data type in <br>
> cable.hpp.<br>
><br>
> 3. Implement associated return code per property on dbus, but this <br>
> would be very inefficient in terms of double the properties on dbus, <br>
> something we would like to avoid<br>
><br>
> Thanks<br>
> Chandrasekhar T.<br>
><br>
<br>
</blockquote></div></div>
</blockquote></div>