On Wed, Oct 12, 2022 at 09:01:46AM -0700, Christian Worm Mortensen wrote:
(I have rehashed the options you've presented, to help commenting on them.)
[...]
> 2) I can make a my own struct and return from my custom dialer:
>
> type myConn struct {
> net.Conn
> dialInfo string
> }
>
> However, that does not work well for TLS. The reason is that the Go HTTP
> client has special logic in case a custom dialer returns a *tls.Conn. That
> logic will be disabled.
The Conn funtion of the crypto/tls package allows to "upgrade" a user-supplied
net.Conn to a tls.Conn, so you could probably try to modify your dialer so
that it returns myConn which has, say, LocalAddr method returning a custom
type which implements net.Addr but also conveys some information about itself,
like in
type MyAddr struct {
addr net.TCPAddr
dialInfo string
}
...
func (a *MyAddr) DialInfo() string { return m.dialInfo }
It's clumsy but should work: you could
if laddr, my := someTLSConn.LocalAddr().(*whateverpkg.MyAddr); my {
di := laddr.DialInfo()
}
or type-assert to an interface containing the single DialInfo() method.
> 1) I can keep a map from net.Conn to information that identifies the dial.
> But when can I delete entries from this map? Go does not have weak pointers.
Combined with the idea above, each myConn could keep a reference to the
"registry" which maintains the mapping from the conns to the dial information
blocks, an have myConn deregister in its Close() method.
Alternatively you could use runtime.SetFinalizer() on your custom myConn type
- passing it a reference to that "registry" object which had your myConn
registered after creation.
The type of that registry must be safe for concurrent use in both cases.
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