Follows an apache log, generates stats, displays them in a console.
I wrote this as a solution to a programming challenge and also to learn Go. This is literally the first code I've written in Go and I was learning it as I went along, so there's a few silly and/or inefficient bits.
The design was inspired by statsd. Logs stream in and the individual fields get parsed out. Every n seconds, there is a flush event- the log data gets rolled up, averaged out; URLs, error codes, user-agents, etc get added up and sorted by occurrence. Then these stats are written to a bucket and appended to a slice of buckets, and we do that every interval.
The UI was built with https://github.com/jroimartin/gocui
I've only tested it with the log generator mentioned below.
- Ensure you have Go installed and $GOPATH set
- Fetch d2top
git clone git@github.com:benwtr/d2top.git d2top && cd d2top - Install dependencies
go get - Build
go build
- For generating junk logs, I’ve been using https://github.com/tamtam180/apache_log_gen/
gem install --no-ri --no-rdoc apache-loggen - Start writing out a log
apache-loggen --rate=46 > access.log - In a new terminal window or tab, start the d2top program
./d2top access.log
The original coding challenge that this project is a solution to:
Create a simple console program that monitors HTTP traffic on your machine:
- Consume an actively written-to w3c-formatted HTTP access log
- Every 10s, display in the console the sections of the web site with the most hits (a section is defined as being what's before the second '/' in a URL. i.e. the section for "http://my.site.com/pages/create' is "http://my.site.com/pages"), as well as interesting summary statistics on the traffic as a whole.
- Ensure a user can keep the console app running and monitor traffic on their machine
- Whenever total traffic for the past 2 minutes exceeds a certain number on average, add a message saying that “High traffic generated an alert - hits = {value}, triggered at {time}”
- Whenever the total traffic drops again below that value on average for the past 2 minutes, add another message detailing when the alert recovered
- Make sure all messages showing when alerting thresholds are crossed remain visible on the page for historical reasons.
- Write a test for the alerting logic