79 lines
1.9 KiB
Go
79 lines
1.9 KiB
Go
package allregions
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import (
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"net"
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)
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// Region contains cloudflared edge addresses. The edge is partitioned into several regions for
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// redundancy purposes.
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type Region struct {
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connFor map[*net.TCPAddr]UsedBy
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}
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// NewRegion creates a region with the given addresses, which are all unused.
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func NewRegion(addrs []*net.TCPAddr) Region {
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// The zero value of UsedBy is Unused(), so we can just initialize the map's values with their
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// zero values.
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m := make(map[*net.TCPAddr]UsedBy)
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for _, addr := range addrs {
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m[addr] = Unused()
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}
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return Region{connFor: m}
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}
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// AddrUsedBy finds the address used by the given connection in this region.
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// Returns nil if the connection isn't using any IP.
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func (r *Region) AddrUsedBy(connID int) *net.TCPAddr {
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for addr, used := range r.connFor {
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if used.Used && used.ConnID == connID {
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return addr
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}
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}
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return nil
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}
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// AvailableAddrs counts how many unused addresses this region contains.
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func (r Region) AvailableAddrs() int {
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n := 0
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for _, usedby := range r.connFor {
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if !usedby.Used {
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n++
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}
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}
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return n
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}
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// GetUnusedIP returns a random unused address in this region.
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// Returns nil if all addresses are in use.
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func (r Region) GetUnusedIP(excluding *net.TCPAddr) *net.TCPAddr {
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for addr, usedby := range r.connFor {
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if !usedby.Used && addr != excluding {
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return addr
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}
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}
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return nil
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}
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// Use the address, assigning it to a proxy connection.
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func (r Region) Use(addr *net.TCPAddr, connID int) {
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r.connFor[addr] = InUse(connID)
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}
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// GetAnyAddress returns an arbitrary address from the region.
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func (r Region) GetAnyAddress() *net.TCPAddr {
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for addr := range r.connFor {
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return addr
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}
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return nil
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}
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// GiveBack the address, ensuring it is no longer assigned to an IP.
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// Returns true if the address is in this region.
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func (r Region) GiveBack(addr *net.TCPAddr) (ok bool) {
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if _, ok := r.connFor[addr]; !ok {
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return false
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}
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r.connFor[addr] = Unused()
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return true
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}
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