frostfs-node/pkg/network/group.go
Leonard Lyubich cbe20a2bac [#607] network: Add helper function to iterate over all addresses
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
2021-06-28 15:52:50 +03:00

141 lines
2.9 KiB
Go

package network
import (
"errors"
"sort"
"github.com/nspcc-dev/neofs-api-go/pkg/netmap"
)
// AddressGroup represents list of network addresses of the node.
//
// List is sorted by priority of use.
type AddressGroup []Address
// StringifyGroup returns concatenation of all addresses
// from the AddressGroup.
//
// The result is order-dependent.
func StringifyGroup(x AddressGroup) string {
var s string
iterateAllAddresses(x, func(addr Address) {
s += addr.String()
})
return s
}
// IterateAddresses iterates over all network addresses of the node.
//
// Breaks iterating on handler's true return.
//
// Handler should not be nil.
func (x AddressGroup) IterateAddresses(f func(Address) bool) {
for i := range x {
if f(x[i]) {
break
}
}
}
// iterateAllAddresses iterates over all network addresses of g
// and passes each of them to f.
func iterateAllAddresses(g AddressGroup, f func(Address)) {
g.IterateAddresses(func(addr Address) bool {
f(addr)
return false
})
}
// Len returns number of addresses in AddressGroup.
func (x AddressGroup) Len() int {
return len(x)
}
// Less returns true if i-th address in AddressGroup supports TLS
// and j-th one doesn't.
func (x AddressGroup) Less(i, j int) bool {
return x[i].TLSEnabled() && !x[j].TLSEnabled()
}
// Swap swaps i-th and j-th addresses in AddressGroup.
func (x AddressGroup) Swap(i, j int) {
x[i], x[j] = x[j], x[i]
}
// MultiAddressIterator is an interface of network address group.
type MultiAddressIterator interface {
// Must iterate over network addresses and pass each one
// to the handler until it returns true.
IterateAddresses(func(string) bool)
// Must return number of addresses in group.
NumberOfAddresses() int
}
// FromIterator forms AddressGroup from MultiAddressIterator structure.
// The result is sorted with sort.Sort.
//
// Returns an error in the absence of addresses or if any of the addresses are incorrect.
func (x *AddressGroup) FromIterator(iter MultiAddressIterator) (err error) {
as := *x
addrNum := iter.NumberOfAddresses()
if addrNum <= 0 {
err = errors.New("missing network addresses")
return
}
if cap(as) >= addrNum {
as = as[:0]
} else {
as = make(AddressGroup, 0, addrNum)
}
iter.IterateAddresses(func(s string) bool {
var a Address
err = a.FromString(s)
fail := err != nil
if !fail {
as = append(as, a)
}
return fail
})
if err == nil {
sort.Sort(as)
*x = as
}
return
}
// WriteToNodeInfo writes AddressGroup to netmap.NodeInfo structure.
func WriteToNodeInfo(g AddressGroup, ni *netmap.NodeInfo) {
num := g.Len()
addrs := make([]string, 0, num)
iterateAllAddresses(g, func(addr Address) {
addrs = append(addrs, addr.String())
})
ni.SetAddresses(addrs...)
}
// Intersects checks if two AddressGroup have
// at least one common address.
func (x AddressGroup) Intersects(x2 AddressGroup) bool {
for i := range x {
for j := range x2 {
if x[i].equal(x2[j]) {
return true
}
}
}
return false
}