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Buffered Logging
Our current logger, especially when writing to a file, is relatively slow. Every time we log a message, it writes to disk, no matter how large or small the message is. That's potentially a lot of disk I/O, and it can really slow down our entire application because many small writes are much slower than a few large writes.
Observability being the reason our app is slow is, frankly, embarrassing.
One solution is to use a buffered writer like bufio.Writer around the file. This allows us to write log messages to an in-memory buffer, and then that buffer is only written to disk when it's full.
bufferedFile := bufio.NewWriterSize(file, 1024)
Assignment
Buffer file logging writes.
LINKO_LOG_FILE=linko.access.log go run .
Run and submit the CLI tests from the root of the Linko repo.
If you create the buffered logger the way I did, it will introduce a subtle bug... but don't worry we'll fix it later!