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-stretch 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

Running kda-stretch on the above data produces:

Running kda-df produces:

I use this to keep a journal of events and easily scrape it for analysis in other programs or databases.