ooni-probe-cli/internal/engine/netx/dialer/saver.go

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package dialer
import (
"context"
"net"
"time"
"github.com/ooni/probe-cli/v3/internal/engine/netx/trace"
"github.com/ooni/probe-cli/v3/internal/netxlite"
)
// saverDialer saves events occurring during the dial
type saverDialer struct {
Dialer
Saver *trace.Saver
}
// DialContext implements Dialer.DialContext
func (d *saverDialer) DialContext(ctx context.Context, network, address string) (net.Conn, error) {
start := time.Now()
conn, err := d.Dialer.DialContext(ctx, network, address)
stop := time.Now()
d.Saver.Write(trace.Event{
Address: address,
Duration: stop.Sub(start),
Err: err,
Name: netxlite.ConnectOperation,
Proto: network,
Time: stop,
})
return conn, err
}
// saverConnDialer wraps the returned connection such that we
// collect all the read/write events that occur.
type saverConnDialer struct {
Dialer
Saver *trace.Saver
}
// DialContext implements Dialer.DialContext
func (d *saverConnDialer) DialContext(ctx context.Context, network, address string) (net.Conn, error) {
conn, err := d.Dialer.DialContext(ctx, network, address)
if err != nil {
return nil, err
}
return &saverConn{saver: d.Saver, Conn: conn}, nil
}
type saverConn struct {
net.Conn
saver *trace.Saver
}
func (c *saverConn) Read(p []byte) (int, error) {
start := time.Now()
count, err := c.Conn.Read(p)
stop := time.Now()
c.saver.Write(trace.Event{
Data: p[:count],
Duration: stop.Sub(start),
Err: err,
NumBytes: count,
Name: netxlite.ReadOperation,
Time: stop,
})
return count, err
}
func (c *saverConn) Write(p []byte) (int, error) {
start := time.Now()
count, err := c.Conn.Write(p)
stop := time.Now()
c.saver.Write(trace.Event{
Data: p[:count],
Duration: stop.Sub(start),
Err: err,
NumBytes: count,
Name: netxlite.WriteOperation,
Time: stop,
})
return count, err
}
var _ Dialer = &saverDialer{}
var _ Dialer = &saverConnDialer{}
var _ net.Conn = &saverConn{}