Reducing match indentation for deeply nested properties - rust

Question

I need to refer to a value deep within a structure which includes an Option nested in a struct property, nested in a Result.
My current (working) solution is:
let raw = &packet[16..];
match PacketHeaders::from_ip_slice(raw) {
Err(_value) => {
/* ignore */
},
Ok(value) => {
match value.ip {
Some(Version4(header)) => {
let key = format!("{}.{}.{}.{},{}.{}.{}.{}",
header.source[0], header.source[1], header.source[2], header.source[3],
header.destination[0], header.destination[1], header.destination[2], header.destination[3],
);
let Count {packets, bytes} = counts.entry(key).or_insert(Count {packets: 0, bytes: 0});
*packets += 1;
*bytes += packet.len();
if p > 1000 { /* exit after 1000 packets */
for (key, value) in counts {
println!("{},{},{}", key, value.packets, value.bytes);
}
return ();
}
p += 1;
}
_ => {
/* ignore */
}
}
}
}
(The problem with my current code is the excessive nesting and the two matches.)
All I want is PacketHeaders::from_ip_slice(ip) >> Ok >> ip >> Some >> Version4.
How can I get this, or ignore a failure nicely (NOT crash/exit) for each captured packet?

Answer 1

Pattern matching nests, and the pattern for struct looks like struct literals with the addition that .. means "and match all the rest, which I don't care about", similar to how the _ pattern means "match anything". Meaning you can do
match PacketHeaders::from_ip_slice(raw) {
Ok(PacketHeaders { ip: Version4(header), .. }) => {
/* handle */
}
_ => {
/* ignore `Err(_)` and other `Ok(_)` */
},
}
and if you're going to ignore all but one case, you can use if let:
if let Ok(PacketHeaders { ip: Version4(header), .. }) = PacketHeaders::from_ip_slice(raw) {
/* handle */
}

Answer 2

Code ended up being:
let raw = &packet[16..];
if let Ok(PacketHeaders { ip: Some(Version4(header)), link: _, vlan: _, transport: _, payload: _}) = PacketHeaders::from_ip_slice(raw) {
let key = format!("{}.{}.{}.{},{}.{}.{}.{}",
header.source[0], header.source[1], header.source[2], header.source[3],
header.destination[0], header.destination[1], header.destination[2], header.destination[3],
);
let Count {packets, bytes} = counts.entry(key).or_insert(Count {packets: 0, bytes: 0});
*packets += 1;
*bytes += packet.len();
}