71 lines
2.1 KiB
ReStructuredText
71 lines
2.1 KiB
ReStructuredText
We need to filter
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=================
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**Senior**
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Hi guy! How're you doing this morning? I've got a new challenge from our
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grateful mates.
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As time goes on from the last rotation the size of the log file gets bigger.
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Furthermore, they want to limit the output of the file to pick only some
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records and only from the end of the file. We need to do something to help
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them as they waste a lot of time reviewing the output.
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**Junior**
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My two cents is that this time is going to be more of a deep bash knowledge.
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Do you agree?
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**Senior**
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By sure, but in addition to some good shell plumbing we're going to squeeze
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Kapow!'s superpowers a litle bit more to get a really good solution.
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Can you take a look at Kapow!'s documentation to see if something can be done?
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**Junior**
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I've seen in the documentation and there is a way to get access to the data
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comming in the request. Do you think we can use this to let them choose how
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to do the filtering?
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**Senior**
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Sounds great! How we have lived without Kapow! all this time?
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As they requested, we can offer them with a parameter to filter the registers
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they want to pick and another parameter to limit the output size in lines.
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**Junior**
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Sounds that will be enough. Now we have to make some modifications to our
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last endpoint definition to add this new feature. Let's start working...
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**Senior**
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Well, we got it again, this is exactly what they need:
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.. code-block:: sh
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kapow route add /db/backup_logs -c 'grep -- "$(kapow get /request/params/filter)" /var/log/backup_db.log \
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| tail -n "$(kapow get /request/params/lines)" \
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| kapow set /response/body'
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It looks a bit weird but we'll have time to re-styling later. Please make
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some tests on your laptop before to publish on the *Corporate Server*.
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Remember to send them an example URL with the parameters the can use to
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filter.
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**Junior**
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Ok, Should look like this, isn't it?
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.. code-block:: console
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$ curl http://localhost:8080/db/backup_logs?filter=rows%20inserted&lines=200
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**Senior**
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Exactly. Another great day helping the company to advance. Let's go for a
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beer for celebrating!
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