This crate / package is a rust module that handles streaming input and output. It's purpose is to tally or accumulate values for a streaming set of keys. It is designed to be stupidly simple and consume / produce whitespace seperate values.
Key Value Counts
I use this library to parse simple journal-like logs where each line is of the form:
2021-03-01 warnings:3 error ... (other items with optional counts)
Supposing I wanted to do some processing on this data. This is a very readable / writeable format, but is not standard.
We can use
kvc-stream to covert it into something more lika a stream of k-value pairs
or
kvc-df to convert it to a pandas dataframe
Spec
The kvc journal format is very simple.
- Each line is a "frame"
- A frame has an optional "date header"
- A frame is composed of a string of whitespace-seperated keys with optional counts per key
- A '#' ends the frame, and is useful for comments
These are valid frames, one per line:
a
event event
2021-04-01 april_fools_pranks:4
2021-03-01 key another_key a-third-key <weird-symbols_ar_ok!> this_has_occured_three_times:3 this_twice this_twice
2021-04-02 # Nothing happened that day
Suppose that's stored in data.txt. (try it!)
Running <data.txt kvc-stream produces:
1 a 1
2 event 2
3 Date 2021-04-01
3 april_fools_pranks 4
4 Date 2021-03-01
4 <weird-symbols_ar_ok!> 1
4 a-third-key 1
4 this_has_occured_three_times 3
4 this_twice 2
4 key 1
4 another_key 1
5 Date 2021-04-02
Running cat data.txt | kvc-df (or < data.txt kvc-df ) produces:
Idx april_fools_pranks this_twice a <weird-symbols_ar_ok!> event Date a-third-key key this_has_occured_three_times another_key
1 N/A N/A 1 N/A N/A N/A N/A N/A N/A N/A
2 N/A N/A N/A N/A 2 N/A N/A N/A N/A N/A
3 4 N/A N/A N/A N/A 2021-04-01 N/A N/A N/A N/A
4 N/A 2 N/A 1 N/A 2021-03-01 1 1 3 1
5 N/A N/A N/A N/A N/A 2021-04-02 N/A N/A N/A N/A
OK, so I actually aligned the text with cat data.txt | kvc-dv | column -t
I use this to keep a journal of events and easily scrape it for analysis in other programs or databases.