72 lines
2.2 KiB
ReStructuredText
72 lines
2.2 KiB
ReStructuredText
We need to filter
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=================
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**Senior**
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Hiya! 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 log rotation, the size of the log file gets
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bigger and bigger. Furthermore, they want to limit the output of the file to
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pick only some records, and only from the end of the file. We need to do
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something to help them as they are wasting a lot of time reviewing the output.
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**Junior**
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I have a feeling that this is going to entail some serious *bash-foo*. What
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do you think?
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**Senior**
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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
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done?
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**Junior**
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I've read in the documentation that there is a way to get access to the data
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coming 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 have we lived without *Kapow!* all this time?
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As they requested, we can offer them 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 about right. Now we have to make some modifications to our last
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endpoint definition to add this new feature. Let's get cracking!
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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:: bash
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kapow route add /db/backup_logs -c 'grep -- "$(kapow get /request/params/filter)" /tmp/backup_db.log \
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| tail -n "$(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 revise the style later. Please
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make some tests on your laptop before we publish it on the *Corporate Server*.
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Remember to send them an example URL with the parameters they can use to
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filter and limit the amount of lines they get.
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**Junior**
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OK, should look like this, doesn'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 advance. Let's go grab a
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beer to celebrate!
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