3 releases
0.1.2 | Jul 5, 2019 |
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0.1.1 | Jul 5, 2019 |
0.1.0 | Jul 5, 2019 |
#15 in #slow
8KB
124 lines
🐈 sleepycat
sleepycat
takes in data from stdin
and outputs on stdout
at a given number of lines per second (LPS).
Why
I was writing a program to parse a log file and draw graphs in real-time. I needed a way to repeatedly test it without generating log files from the source application. sleepycat
was born so I could reuse the same log file and pipe it into my application at a customizable rate.
Sure, you could do it in Bash with some clever scripting, but I wanted the ability to add in some custom patterns at some point.
Installation
You have several ways to get sleepycat
:
- Download from crates.io:
cargo install sleepycat
- *Coming Soon* Download a prebuilt binary from the releases page.
- Build it yourself.
- Clone this repo:
git clone https://github.com/daniellockyer/sleepycat
- Build the binary in release mode:
cargo build --release
- The binary is available at
target/release/sleepycat
- Clone this repo:
Accuracy
Right now, this project is just an attempt to get something running. It doesn't take into account the time it takes to print a line, so it sleep
s for too long and the actual LPS ends up being lower than the target. It's not so much of a big deal with smaller targets, but it struggles to reach higher numbers.
You can test the accuracy using the following command:
cargo run --release < access.log | pv --line-mode --rate > /dev/null
- For a target of 10 LPS, it reaches 9.99.
- For a target of 100 LPS, it reaches 98.1.
- For a target of 500 LPS, it reaches 460.
Dependencies
~1.5MB
~24K SLoC