Python for Entrepreneurs Transcripts
Chapter: Course Conclusion
Lecture: Lightning review: Monitoring

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0:01 We don't really want to run our code without knowing what's going on
0:04 it's super hard to just look at a server on the internet
0:07 that you have control over and know what's happening
0:09 without some kind of instrumentation. So we started by setting up a Logbook.
0:13 Logbook is a really nice clean way to work with logging in Python.
0:17 From the same guy who created Flask.
0:19 So we just import Logbook, and then we're going to set the level
0:24 possibly set the file name that we're going to go to
0:26 and we said look, if we're in development mode,
0:29 we want to just output our log messages to standard out
0:32 so we say logbook, stream handler, give it the standard out stream,
0:35 the level we want and push that to the application so it's available everywhere.
0:38 In production, we want to use a time rotating file handler
0:41 so basically a new log file day by day.
0:45 So we are going to do this kind instead and push that globally to the application.
0:48 After we ran this once at start up, we just create a logger
0:52 by saying the logbook logger give it a name,
0:54 that will appear as part of the hierarchy of the log,
0:57 and then you maybe come up with a message
0:59 and say like notice, info, error, warning, those kinds of things.
1:03 So the various options are log, notice, info, trace, warn, error or critical,
1:07 and depending on the level that you pass when you set up
1:11 only messages of higher priority
1:13 than the level you've sort of set as the base will come out.
1:17 So, for example, if you say I only want to work with info and above
1:20 things like trace won't appear, right, if I only want to work with notice and above,
1:25 info and trace won't appear in my log, so you can dial that in a little bit there.
1:28 Here's what you get when you do one of these log messages,
1:32 date, time, the level, here we have notice again,
1:36 the app which is the name that we put at the top
1:38 and then the message we actually wanted to give them.
1:41 So that's great for the logs, but how often do you go back and read those, right,
1:46 especially if you have a super busy site, it could be millions of lines of
1:49 the users viewed this page, the users viewed that page,
1:52 somebody is trying to hack your WP admin page,
1:55 which you don't have, things like this.
1:57 But you want to get notifications if something goes wrong,
2:00 if your database goes down or there's some primary key violation that you never expected,
2:04 you would like to not know eventually when your user complaints to you,
2:07 you would like a notification immediately.
2:10 So we also installed Rollbar, you can get a free account there,
2:14 there's also a paid account, but the free account is pretty decent here
2:17 and all you have to do is add a little bit of configuration
2:19 to your either development or production.any file
2:23 and then just a tiny bit of code to include it,
2:27 and use it in your __init__for your entry point
2:30 and that's it, everything's up and running, it just basically intercept all the requests
2:35 to your site, and if there's anything that goes wrong, it'll capture all that information,
2:41 store it for you and send you some kind of notification.
2:43 So, you can check out how to set that up here.