cloudflared-mirror/edgediscovery/allregions/address.go

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package allregions
// Region contains cloudflared edge addresses. The edge is partitioned into several regions for
// redundancy purposes.
type AddrSet map[*EdgeAddr]UsedBy
// AddrUsedBy finds the address used by the given connection in this region.
// Returns nil if the connection isn't using any IP.
func (a AddrSet) AddrUsedBy(connID int) *EdgeAddr {
for addr, used := range a {
if used.Used && used.ConnID == connID {
return addr
}
}
return nil
}
// AvailableAddrs counts how many unused addresses this region contains.
func (a AddrSet) AvailableAddrs() int {
n := 0
for _, usedby := range a {
if !usedby.Used {
n++
}
}
return n
}
// GetUnusedIP returns a random unused address in this region.
// Returns nil if all addresses are in use.
func (a AddrSet) GetUnusedIP(excluding *EdgeAddr) *EdgeAddr {
for addr, usedby := range a {
if !usedby.Used && addr != excluding {
return addr
}
}
return nil
}
// Use the address, assigning it to a proxy connection.
func (a AddrSet) Use(addr *EdgeAddr, connID int) {
if addr == nil {
return
}
a[addr] = InUse(connID)
}
// GetAnyAddress returns an arbitrary address from the region.
func (a AddrSet) GetAnyAddress() *EdgeAddr {
for addr := range a {
return addr
}
return nil
}
// GiveBack the address, ensuring it is no longer assigned to an IP.
// Returns true if the address is in this region.
func (a AddrSet) GiveBack(addr *EdgeAddr) (ok bool) {
if _, ok := a[addr]; !ok {
return false
}
a[addr] = Unused()
return true
}