The AWS session and s3 manager are concurrent safe, it should be reused
whenever possible:
Sessions are safe to use concurrently as long as the Session is not
being modified. Sessions should be cached when possible, because
creating a new Session will load all configuration values from the
environment, and config files each time the Session is created.
See https://pkg.go.dev/github.com/aws/aws-sdk-go/aws/session
Currently, an aws session and s3 client/manager are created every time a
call to Upload, CurrentID or Download is made. I changed it so it creates
one session and S3 manager during app startup and reuse it afterwards.
Philip O'Toole
Mauri de Souza Meneguzzo
Jason Tackaberry