Add returned peer fields last_handshake_time, rx_bytes and tx_bytes

[cmoiccool]

Description

This pull request enhances the wireguard_py library by adding additional peer statistics and making necessary adjustments to support these new attributes. The most important changes include updating the Peer class to include new fields, modifying the list_peers function to display these new statistics, and adjusting the Cython interface to handle the new data.

Enhancements to peer statistics:

• wireguard_py/wireguard_common.py: Added last_handshake_time, rx_bytes, and tx_bytes as optional fields to the Peer class.
• wireguard_py/wgpy.py: Updated the list_peers function to print the new fields last_handshake_time, rx_bytes, and tx_bytes if they are not None.

Adjustments to Cython interface:

• wireguard_py/wireguard_py.pxd: Introduced uint64_t from stdint.h and added timespec64, rx_bytes, and tx_bytes to the wg_peer structure. [1] [2]
• wireguard_py/wireguard_py.pyx: Modified the list_peers function to assign last_handshake_time, rx_bytes, and tx_bytes from the C structure to the Python Peer object.

Motivation and Context

The list_peers method was not returning the last_hanshake_time rx_bytes and tx_bytes returned by the kernel call making it impossible to use it to monitor peer status and statistics: Resolves #3

How Has This Been Tested?

Tests have been realised on an Ubuntu server with active peers on an existing interface with the modified wgpy.py to ensure that peers that have never connected and peers that has already connected have returned either values of 0 when never connected or valid values when already connected when the wgpy.py list-peers was called. I have also tested with a loop creating up to 40 peers to make sure that the list-peers returns all the created peers.

Screenshots (if appropriate):

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation and I have updated the documentation.

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This pull request has been merged in facebookincubator/wireguard_py@add244deaa133b34b879bed89c62ddce4884ecb5.