Comments (6)
robhoes
commented on September 18, 2024
1
Make the existing function actually use the expression/filter.
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robhoes
commented on September 18, 2024
For most classes, these functions are auto-generated. However, messages are implemented differently, as they are not stored in the usual xapi DB, but directly in the file system as XML files (due to the volume). So this one may be missing, but it should be possible to implement it. See ocaml/xapi/xapi_message.ml.
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olivierlambert
commented on September 18, 2024
Oh okay, so maybe I got it wrong: I thought the where clause was used to filter a property in the XAPI object (eg like the name which can be "ALARM".
But it seems you are telling me it's used to filter on the XML content of the message ie the body entry. Example:
# xe message-param-list uuid=5c128a5e-06c6-787f-4ab1-7f7f86ec74fa
uuid ( RO) : 5c128a5e-06c6-787f-4ab1-7f7f86ec74fa
name ( RO): ALARM
priority ( RO): 3
class ( RO): SR
obj-uuid ( RO): 6e6ee285-0efe-63d8-c354-d5f760e4d96c
timestamp ( RO): 20230328T14:46:01Z
body ( RO): value: 1.0
config:
<variable>
<name value="physical_utilisation"/>
<alarm_trigger_level value="0.8"/>
<alarm_trigger_period value ="60"/>
</variable>
My concern is not filtering the body but the name directly, to only get the filtered results (I don't want to fetch 10,000 messages). So it might be another new method added in the message class then?
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robhoes
commented on September 18, 2024
No, the body may or may not contain XML, it depends on the message. But the messages themselves, including the name etc, are stored as XML files. Look in /var/xapi/blobs/messages. Here's an example:
# xmllint --format /var/xapi/blobs/messages/VM/614f7739-e975-7447-e76f-b7099cffe2f0/1692885300.00000
<?xml version="1.0" encoding="UTF-8"?>
<message>
<generation>45076</generation>
<ref>OpaqueRef:5f4969f7-6417-1a14-b658-c531282cc5aa</ref>
<name>VM_SHUTDOWN</name>
<priority>5</priority>
<cls>VM</cls>
<obj_uuid>614f7739-e975-7447-e76f-b7099cffe2f0</obj_uuid>
<timestamp>20230824T13:55:00Z</timestamp>
<uuid>9b4f5e63-4b59-2365-fe4f-c3cd89fec9db</uuid>
<body>VM 'win10-x64' (uuid: 614f7739-e975-7447-e76f-b7099cffe2f0) shutdown</body>
</message>
So you could implement a filter on name, priority etc.
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olivierlambert
commented on September 18, 2024
Okay so what would the next recommended step:
- using the existing
get_all_records_whereto build that filter - create a new method in the message class
- something else?
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olivierlambert
commented on September 18, 2024
Okay we might get back to you with some questions on the "right way" to implement that. Thank you!
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