QUIC Logging

import "golang.org/x/net/quic/qlog"

const (
    // VantageEndpoint traces contain events not specific to a single connection
    VantageEndpoint = Vantage("endpoint")

    // VantageClient traces follow a connection from the client's perspective
    VantageClient = Vantage("client")

    // VantageServer traces follow a connection from the server's perspective
    VantageServer = Vantage("server")
)

// Vantage is the vantage point from which a trace is recorded
type Vantage string

func (v Vantage) String() string

// TraceInfo contains information about a trace
type TraceInfo struct {
    Vantage Vantage // Vantage point of the trace
    GroupID string  // Identifies the logical group the trace belongs to
}

import (
    "golang.org/x/net/quic"
    "log/slog"
    "os"
)

func setupQLogLogging() *quic.Config {
    // Create qlog logger
    qlogFile, err := os.Create("quic.qlog")
    if err != nil {
        panic(err)
    }

    logger := slog.New(slog.NewJSONHandler(qlogFile, &slog.HandlerOptions{
        Level: quic.QLogLevelPacket,
    }))

    return &quic.Config{
        QLogLogger: logger,
    }
}