set keep alive probes for mysql connection

[dgalas2]

Summary

Adding socket_options to configure socket connection for mysql client to allow user to configure specific socket options.

Example Use:

import socket
socket_options = {socket.IPPROTO_TCP: {socket.TCP_KEEPIDLE:60, socket.TCP_KEEPINTVL: 30, socket.TCP_KEEPCNT: 5}}
conn = s2.connect(connection_url, results_type="dict",socket_options=socket_options)

[kesmit13]

I'm a little concerned about changing a default behavior by this much without a way for the user to change them. These timings are drastically shorter than the defaults. I'm not sure what effect this will have on existing workflows.

[ricardoasmarques]

I'm a little concerned about changing a default behavior by this much without a way for the user to change them. These timings are drastically shorter than the defaults. I'm not sure what effect this will have on existing workflows.

@kesmit13 Maybe we can make it configurable just like we do for other setting like connect_timeout, max_allowed_packet, etc?

This way user could change it if needed. Would you be ok with that?

[dgalas2]

I'm a little concerned about changing a default behavior by this much without a way for the user to change them. These timings are drastically shorter than the defaults. I'm not sure what effect this will have on existing workflows.

should we put this behind a parameter, if user sets keep_alive in s2.connect, only then do we set these values. Until we figure out what the underlying problem is we need a way to unblock customers that is simpler than asking them to add code snippets

[kesmit13]

This error about dbapi is because the top-level Connection object has a socket_options parameter, so all subclasses must have that specified as well. This would be in http/connection.py:Connection. It doesn't have to do anything with it, but it must be defined.