Re: Modifying same-table else-row, and other-data on row insert...

It's been over a month, and I realise Christmas and New Year have been in
the middle, but I'm just wondering if anyone had any thoughts on my problem
here...

It's less important now, since I've put a nasty, nasty, hack around it; by
putting the necessary work I wanted doing in the script that calls the
command to add rows the table instead, but it would be nice to know how I
should have done it properly.

Is there any information missing that I should have included in my original
request, that would enable anyone to help me, so if/when I come to modify
the module I can get rid of the hack?

On Thu, Dec 12, 2019 at 1:50 PM Paul Herring <[email protected]> wrote:

> TLDR: Programmatically...
> 1) How can I delete other 'unrelated' rows from a table when adding a row
> to that same table.
> 2) How can I read/write data elsewhere?
>
> ==
>
> Setup:
> I have a table with details of 'alarms' (think alerts) - one per line -
> with various data associated  with each alarm (id, source, other data.) in
> the columns
> I also have a set of scalars associated with this table under a group
> that's a sibling to the table. Things like max number of alarms to
> currently hold, and other meta data.
>
> myExampleAlarmHistory
> ..+..myExampleAlarmHistoryMeta
> ..|....+ myExampleAlarmHistoryMetaCount - max to hold
> ..|....+ myExampleAlarmHistoryMetaMin - min index used
> ..|....+ myExampleAlarmHistoryMetaMax - max index used
> ..|....` myExampleAlarmHistoryMetaNext - next index to use (?)
> ..`..myExampleAlarmHistoryTable - table
> .....`..myExampleAlarmHistoryEntry - entry for an alarm
> .........+..myExampleAlarmHistoryIndex - index
> .........+..myExampleAlarmHistoryId - data
> .........+..myExampleAlarmHistoryRuleId - data
>
> (Partial MIB for this available at https://pastebin.com/pVARXLsv)
>
> Every time an alarm happens, another line of the table is added (I have
> this bit working; both createAndGo and createAndWait - under the
> presumption that I know which index to add it under)
>
> However when that line is added (I'm presuming in
> myExampleAlarmHistoryTable_commit() in
> myExampleAlarmHistoryTable_data_set.c) what I'd like to do is
>
> 1) examine the scalar myExampleAlarmHistoryMetaCount to determine how many
> rows I should currently be holding (to compare with
> myExampleAlarmHistoryTable_container_size())
> 2) delete earlier rows if I currently hold too many
> 3) update the other scalars under myExampleAlarmHistoryMeta
>
> The code I'm working with was produced using mib2c.mfd.conf against
> myExampleAlarmHistoryTable, so it doesn't have direct sight of the sibling
> myExampleAlarmHistoryMeta group or anything in it.
>
> Is there any way of using the API to do these things, if so which
> functions do I need?
> Is there a canonical way of doing this? (My google-foo hasn't found any
> source code doing similar - are there any specific examples around?)
> Do I need to set up the code differently somehow?
>
>
> Possibly pertinent info:
> $ cat .mib2c-updaterc
> UPDATE_OID=myExampleAlarmHistoryTable
> UPDATE_CONF=mib2c.mfd.conf
>
> $ grep eval defaults/table-MyExampleAlarmHistoryTable.m2d
> @eval $m2c_context_reg = "netsnmp_data_list"@
> @eval $m2c_data_allocate = 0@
> @eval $m2c_data_cache = 0@
> @eval $m2c_data_context = "generated"@ [generated|NAME]
> @eval $m2c_data_init = 1@
> @eval $m2c_data_transient = 2@
> @eval $m2c_include_examples = 1@
> @eval $m2c_irreversible_commit = 0@
> @eval $m2c_table_access = "container-cached"@
> @eval $m2c_table_dependencies = 1@
> @eval $m2c_table_persistent = 1@
> @eval $m2c_table_row_creation = 1@
> @eval $m2c_table_settable = 1@
> @eval $m2c_table_skip_mapping = -1@
> @eval $m2c_table_sparse = 1@
> @eval $mfd_generate_makefile = 0@
> @eval $mfd_generate_subagent = 0@
>
> $ 2>/dev/null yum info net-snmp-perl | egrep -i "version|release"
> *Version     : 5.7.2*
> Release     : 43.el7
>
> --
> PJH
>
>

-- 
PJH

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