Overhaul stats events: merge UDP server events with a different IP version

[josecelano]

Change events in torrust_udp_tracker_server::statistics::event::Event from this:

pub enum Event {
    UdpRequestAborted,
    UdpRequestBanned,

    // UDP4
    Udp4IncomingRequest,
    Udp4Request {
        kind: UdpResponseKind,
    },
    Udp4Response {
        kind: UdpResponseKind,
        req_processing_time: Duration,
    },
    Udp4Error,

    // UDP6
    Udp6IncomingRequest,
    Udp6Request {
        kind: UdpResponseKind,
    },
    Udp6Response {
        kind: UdpResponseKind,
        req_processing_time: Duration,
    },
    Udp6Error,
}

pub enum UdpRequestKind {
    Connect,
    Announce,
    Scrape,
    Error,
}

To this:

pub enum Event {
    UdpRequestReceived {
        context: ConnectionContext,
    },
    UdpRequestAborted {
        context: ConnectionContext,
    },
    UdpRequestBanned {
        context: ConnectionContext,
    },
    UdpRequestAccepted {
        context: ConnectionContext,
        kind: UdpRequestKind,
    },
    UdpResponseSent {
        context: ConnectionContext,
        kind: UdpResponseKind,
        req_processing_time: Duration,
    },
    UdpError {
        context: ConnectionContext,
    },
}

pub enum UdpRequestKind {
    Connect,
    Announce,
    Scrape,
}

pub enum UdpResponseKind {
    Ok { req_kind: UdpRequestKind },
    Error { opt_req_kind: Option<UdpRequestKind> },
}

pub struct ConnectionContext {
    client_socket_addr: SocketAddr,
    server_socket_addr: SocketAddr,
}

Sub-tasks

• Add enum UdpResponseKind. UdpRequestKind::Error variant does not make sense.
• Add ConnectionContext to events.
• Merge events with the same request type (connect, announce and scrape).

[codecov]

Codecov Report

Attention: Patch coverage is 97.63033% with 5 lines in your changes missing coverage. Please review.

Project coverage is 81.91%. Comparing base (df507a8) to head (9a8a0dc).
Report is 7 commits behind head on develop.

Files with missing lines	Patch %	Lines
...ges/udp-tracker-server/src/statistics/event/mod.rs	75.00%	3 Missing ⚠️
packages/udp-tracker-server/src/handlers/scrape.rs	92.30%	1 Missing ⚠️
...udp-tracker-server/src/statistics/event/handler.rs	99.35%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1383      +/-   ##
===========================================
- Coverage    81.91%   81.91%   -0.01%     
===========================================
  Files          231      232       +1     
  Lines        16974    17104     +130     
  Branches     16974    17104     +130     
===========================================
+ Hits         13905    14010     +105     
- Misses        2826     2842      +16     
- Partials       243      252       +9     

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[josecelano]

ACK 9a8a0dc