pub(crate) struct Listen(Vec<ListenItem, Global>);
Expand description

Specification of (possibly) something to listen on (eg, a port, or some addresses/ports)

Can represent, at least:

  • “do not listen”
  • Listen on the following port on localhost (IPv6 and IPv4)
  • Listen on precisely the following address and port
  • Listen on several addresses/ports

Currently only IP (v6 and v4) is supported.

Tuple Fields

0: Vec<ListenItem, Global>

Implementations

Create a new Listen specifying no addresses (no listening)

Create a new Listen specifying listening on a port on localhost

Special case: if port is zero, specifies no listening.

Create a new Listen, possibly specifying listening on a port on localhost

Special case: if port is Some(0), also specifies no listening.

List the network socket addresses to listen on

Each returned item is a list of SocketAddr, of which at least one must be successfully bound. It is OK if the others (up to all but one of them) fail with EAFNOSUPPORT (“Address family not supported”). This allows handling of support, or non-support, for particular address faimilies, eg IPv6 vs IPv4 localhost. Other errors (eg, EADDRINUSE) should always be treated as serious problems.

Fails if the listen spec involves listening on things other than IP addresses. (Currently that is not possible.)

Get the localhost port to listen on

Returns None if listening is configured to be disabled.

Fails, giving an unsupported error, if the configuration isn’t just “listen on a single localhost port”.

Trait Implementations

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