go-tarantool/v2/pool.Add: no logs on single connection failure

[Maximilan4]

Create pool with empty set of instances:

p, err := pool.ConnectWithOpts(ctx, []pool.Instance{}, connOpts)
...

Later, try to add new instances via add method:

if err = p.Add(ctx, instance); err != nil {
  return fmt.Errorf("conn [%s] err: %w", instance.Name, err)
}

When unable to establish connection with tarantool, i got no err here, no message in logs.
First of all, no any logging at pool/connection_pool.go:285, if canceled variable is false.
Second - no any err handling and logging at pool/connection_pool.go:1419.

Easy proposal: add some basic log.Printf for logging errors in code above.
Hard proposal:

1. expand basic Logger interface by basic logging methods (Info)
2. remove method Report from Logger
3. move method Report from defaultLogger to a specific or common dealer, which always logs specific events with Logger methods
4. use Logger more often in code

This can allow:

1. use custom logger inside a connector by writing specific adapter
2. do not touch default log.SetOutput
3. manage of verbose level

[oleg-jukovec]

Thank you for the feedback!

This doesn't look like a priority bug or issue, so I can't promise we'll start working on it soon. But you could create a pull request with Easy proposal: add some basic log.Printf for logging errors in code above. and we will review/merge it.

We have some ideas to improve logging for ConnectionPool so the proposal was added to the backlog.

[Maximilan4]

Alright, i`ll try to do a request with logs in described parts today. Backlog state looks good.