83 lines
2.0 KiB
Go
83 lines
2.0 KiB
Go
package allregions
|
|
|
|
import (
|
|
"net"
|
|
)
|
|
|
|
// Region contains cloudflared edge addresses. The edge is partitioned into several regions for
|
|
// redundancy purposes.
|
|
type Region struct {
|
|
connFor map[*net.TCPAddr]UsedBy
|
|
}
|
|
|
|
// NewRegion creates a region with the given addresses, which are all unused.
|
|
func NewRegion(addrs []*net.TCPAddr) Region {
|
|
// The zero value of UsedBy is Unused(), so we can just initialize the map's values with their
|
|
// zero values.
|
|
m := make(map[*net.TCPAddr]UsedBy)
|
|
for _, addr := range addrs {
|
|
m[addr] = Unused()
|
|
}
|
|
return Region{connFor: m}
|
|
}
|
|
|
|
// AddrUsedBy finds the address used by the given connection in this region.
|
|
// Returns nil if the connection isn't using any IP.
|
|
func (r *Region) AddrUsedBy(connID int) *net.TCPAddr {
|
|
for addr, used := range r.connFor {
|
|
if used.Used && used.ConnID == connID {
|
|
return addr
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// AvailableAddrs counts how many unused addresses this region contains.
|
|
func (r Region) AvailableAddrs() int {
|
|
n := 0
|
|
for _, usedby := range r.connFor {
|
|
if !usedby.Used {
|
|
n++
|
|
}
|
|
}
|
|
return n
|
|
}
|
|
|
|
// GetUnusedIP returns a random unused address in this region.
|
|
// Returns nil if all addresses are in use.
|
|
func (r Region) GetUnusedIP(excluding *net.TCPAddr) *net.TCPAddr {
|
|
for addr, usedby := range r.connFor {
|
|
if !usedby.Used && addr != excluding {
|
|
return addr
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Use the address, assigning it to a proxy connection.
|
|
func (r Region) Use(addr *net.TCPAddr, connID int) {
|
|
if addr == nil {
|
|
//logrus.Errorf("Attempted to use nil address for connection %d", connID)
|
|
return
|
|
}
|
|
r.connFor[addr] = InUse(connID)
|
|
}
|
|
|
|
// GetAnyAddress returns an arbitrary address from the region.
|
|
func (r Region) GetAnyAddress() *net.TCPAddr {
|
|
for addr := range r.connFor {
|
|
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 (r Region) GiveBack(addr *net.TCPAddr) (ok bool) {
|
|
if _, ok := r.connFor[addr]; !ok {
|
|
return false
|
|
}
|
|
r.connFor[addr] = Unused()
|
|
return true
|
|
}
|