fn ssh_address_from<'a, I>(iter: I) -> Option<TargetAddr>
where
    I: Iterator<Item = &'a TargetAddrEntry>,
{
    use itertools::Itertools;

    // Order e1 & e2 by most recent timestamp
    let recency = |e1: &TargetAddrEntry, e2: &TargetAddrEntry| e2.timestamp.cmp(&e1.timestamp);

    // Order by link-local first, then by recency
    let link_local_recency = |e1: &TargetAddrEntry, e2: &TargetAddrEntry| match (
        e1.addr.ip.is_link_local_addr(),
        e2.addr.ip.is_link_local_addr(),
    ) {
        (true, true) | (false, false) => recency(e1, e2),
        (true, false) => Ordering::Less,
        (false, true) => Ordering::Greater,
    };

    let manual_link_local_recency = |e1: &TargetAddrEntry, e2: &TargetAddrEntry| {
        match (e1.manual, e2.manual) {
            // Note: for manually added addresses, they are ordered strictly
            // by recency, not link-local first.
            (true, true) => recency(e1, e2),
            (true, false) => Ordering::Less,
            (false, true) => Ordering::Greater,
            (false, false) => link_local_recency(e1, e2),
        }
    };

    iter.sorted_by(|e1, e2| manual_link_local_recency(e1, e2)).next().map(|e| e.addr.clone())
}
/// Given an iterator of TargetAddrEntry, return the TargetAddr from the entry
/// that should be attempted for SSH connections next.
///
/// The sort algorithm for SSH address priority is in order of:
/// - Manual addresses first
///   - By recency of observation
/// - Other addresses
///   - By link-local first
///   - By most recently observed
///
/// The host-pipe connection mechanism will requests addresses from this function
/// on each connection attempt.
Given an iterator of TargetAddrEntry, return the TargetAddr from the entry
that should be attempted for SSH connections next.

The sort algorithm for SSH address priority is in order of:
Manual addresses first
By recency of observation
Other addresses
By link-local first
By most recently observed

The host-pipe connection mechanism will requests addresses from this function
on each connection attempt.
Given an iterator of TargetAddrEntry return the TargetAddr from the entry that should be attempted for SSH connections next . The sort algorithm for SSH address priority is in order of : Manual addresses first By recency of observation Other addresses By link - local first By most recently observed The host - pipe connection mechanism will requests addresses from this function on each connection attempt .
fn ssh_address_from<'a, I>(iter: I) -> Option<TargetAddr>
where
    I: Iterator<Item = &'a TargetAddrEntry>,
{
    use itertools::Itertools;
    // Order e1 & e2 by most recent timestamp
    let recency = |e1: &TargetAddrEntry, e2: &TargetAddrEntry| e2.timestamp.cmp(&e1.timestamp);
    // Order by link-local first, then by recency
    let link_local_recency = |e1: &TargetAddrEntry, e2: &TargetAddrEntry| match (
        e1.addr.ip.is_link_local_addr(),
        e2.addr.ip.is_link_local_addr(),
    ) {
        (true, true) | (false, false) => recency(e1, e2),
        (true, false) => Ordering::Less,
        (false, true) => Ordering::Greater,
    };
    let manual_link_local_recency = |e1: &TargetAddrEntry, e2: &TargetAddrEntry| {
        match (e1.manual, e2.manual) {
            // Note: for manually added addresses, they are ordered strictly
            // by recency, not link-local first.
            (true, true) => recency(e1, e2),
            (true, false) => Ordering::Less,
            (false, true) => Ordering::Greater,
            (false, false) => link_local_recency(e1, e2),
        }
    };
    iter.sorted_by(|e1, e2| manual_link_local_recency(e1, e2)).next().map(|e| e.addr.clone())
}
fn ssh_address_from < ' a , I > ( iter : I ) -> Option < TargetAddr > where I : Iterator < Item = & ' a TargetAddrEntry > , { use itertools :: Itertools ; // Order e1 & e2 by most recent timestamp let recency = | e1 : & TargetAddrEntry , e2 : & TargetAddrEntry | e2 . timestamp . cmp ( & e1 . timestamp ) ; // Order by link-local first, then by recency let link_local_recency = | e1 : & TargetAddrEntry , e2 : & TargetAddrEntry | match ( e1 . addr . ip . is_link_local_addr ( ) , e2 . addr . ip . is_link_local_addr ( ) , ) { ( true , true ) | ( false , false ) => recency ( e1 , e2 ) , ( true , false ) => Ordering :: Less , ( false , true ) => Ordering :: Greater , } ; let manual_link_local_recency = | e1 : & TargetAddrEntry , e2 : & TargetAddrEntry | { match ( e1 . manual , e2 . manual ) { // Note: for manually added addresses, they are ordered strictly // by recency, not link-local first. ( true , true ) => recency ( e1 , e2 ) , ( true , false ) => Ordering :: Less , ( false , true ) => Ordering :: Greater , ( false , false ) => link_local_recency ( e1 , e2 ) , } } ; iter . sorted_by ( | e1 , e2 | manual_link_local_recency ( e1 , e2 ) ) . next ( ) . map ( | e | e . addr . clone ( ) ) }
Given an iterator of TargetAddrEntry, return the TargetAddr from the entry
that should be attempted for SSH connections next.
Given an iterator of TargetAddrEntry return the TargetAddr from the entry that should be attempted for SSH connections next .
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