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portallocator: rewrite to simplify, removes race condition
Docker-DCO-1.1-Signed-off-by: Erik Hollensbe <github@hollensbe.org> (github: erikh)
This commit is contained in:
Erik Hollensbe
parent
a94a87778c
commit
f0489ce3a9
1 changed files with 62 additions and 121 deletions
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@ -2,21 +2,21 @@ package portallocator
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import (
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"errors"
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"github.com/dotcloud/docker/pkg/collections"
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"net"
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"sync"
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)
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type (
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portMap map[int]bool
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protocolMap map[string]portMap
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ipMapping map[string]protocolMap
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)
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const (
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BeginPortRange = 49153
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EndPortRange = 65535
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)
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type (
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portMappings map[string]*collections.OrderedIntSet
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ipMapping map[string]portMappings
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)
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var (
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ErrAllPortsAllocated = errors.New("all ports are allocated")
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ErrPortAlreadyAllocated = errors.New("port has already been allocated")
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@ -24,165 +24,106 @@ var (
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)
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var (
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currentDynamicPort = map[string]int{
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"tcp": BeginPortRange - 1,
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"udp": BeginPortRange - 1,
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}
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defaultIP = net.ParseIP("0.0.0.0")
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defaultAllocatedPorts = portMappings{}
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otherAllocatedPorts = ipMapping{}
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lock = sync.Mutex{}
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mutex sync.Mutex
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defaultIP = net.ParseIP("0.0.0.0")
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globalMap = ipMapping{}
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)
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func init() {
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defaultAllocatedPorts["tcp"] = collections.NewOrderedIntSet()
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defaultAllocatedPorts["udp"] = collections.NewOrderedIntSet()
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}
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// RequestPort returns an available port if the port is 0
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// If the provided port is not 0 then it will be checked if
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// it is available for allocation
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func RequestPort(ip net.IP, proto string, port int) (int, error) {
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lock.Lock()
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defer lock.Unlock()
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mutex.Lock()
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defer mutex.Unlock()
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if err := validateProtocol(proto); err != nil {
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if err := validateProto(proto); err != nil {
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return 0, err
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}
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// If the user requested a specific port to be allocated
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ip = getDefault(ip)
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mapping := getOrCreate(ip)
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if port > 0 {
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if err := registerSetPort(ip, proto, port); err != nil {
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if !mapping[proto][port] {
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mapping[proto][port] = true
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return port, nil
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} else {
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return 0, ErrPortAlreadyAllocated
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}
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} else {
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port, err := findPort(ip, proto)
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if err != nil {
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return 0, err
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}
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return port, nil
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}
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return registerDynamicPort(ip, proto)
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}
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// ReleasePort will return the provided port back into the
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// pool for reuse
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func ReleasePort(ip net.IP, proto string, port int) error {
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lock.Lock()
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defer lock.Unlock()
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mutex.Lock()
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defer mutex.Unlock()
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if err := validateProtocol(proto); err != nil {
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return err
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}
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ip = getDefault(ip)
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allocated := defaultAllocatedPorts[proto]
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allocated.Remove(port)
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mapping := getOrCreate(ip)
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delete(mapping[proto], port)
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if !equalsDefault(ip) {
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registerIP(ip)
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// Remove the port for the specific ip address
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allocated = otherAllocatedPorts[ip.String()][proto]
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allocated.Remove(port)
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}
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return nil
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}
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func ReleaseAll() error {
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lock.Lock()
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defer lock.Unlock()
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mutex.Lock()
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defer mutex.Unlock()
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currentDynamicPort["tcp"] = BeginPortRange - 1
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currentDynamicPort["udp"] = BeginPortRange - 1
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defaultAllocatedPorts = portMappings{}
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defaultAllocatedPorts["tcp"] = collections.NewOrderedIntSet()
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defaultAllocatedPorts["udp"] = collections.NewOrderedIntSet()
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otherAllocatedPorts = ipMapping{}
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globalMap = ipMapping{}
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return nil
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}
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func registerDynamicPort(ip net.IP, proto string) (int, error) {
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func getOrCreate(ip net.IP) protocolMap {
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ipstr := ip.String()
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if !equalsDefault(ip) {
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registerIP(ip)
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ipAllocated := otherAllocatedPorts[ip.String()][proto]
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port, err := findNextPort(proto, ipAllocated)
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if err != nil {
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return 0, err
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if _, ok := globalMap[ipstr]; !ok {
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globalMap[ipstr] = protocolMap{
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"tcp": portMap{},
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"udp": portMap{},
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}
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ipAllocated.Push(port)
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return port, nil
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} else {
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allocated := defaultAllocatedPorts[proto]
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port, err := findNextPort(proto, allocated)
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if err != nil {
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return 0, err
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}
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allocated.Push(port)
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return port, nil
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}
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}
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func registerSetPort(ip net.IP, proto string, port int) error {
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allocated := defaultAllocatedPorts[proto]
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if allocated.Exists(port) {
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return ErrPortAlreadyAllocated
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}
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if !equalsDefault(ip) {
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registerIP(ip)
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ipAllocated := otherAllocatedPorts[ip.String()][proto]
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if ipAllocated.Exists(port) {
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return ErrPortAlreadyAllocated
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}
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ipAllocated.Push(port)
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} else {
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allocated.Push(port)
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}
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return nil
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return globalMap[ipstr]
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}
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func equalsDefault(ip net.IP) bool {
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return ip == nil || ip.Equal(defaultIP)
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}
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func findPort(ip net.IP, proto string) (int, error) {
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port := BeginPortRange
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func findNextPort(proto string, allocated *collections.OrderedIntSet) (int, error) {
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port := nextPort(proto)
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startSearchPort := port
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for allocated.Exists(port) {
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port = nextPort(proto)
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if startSearchPort == port {
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mapping := getOrCreate(ip)
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for mapping[proto][port] {
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port++
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if port > EndPortRange {
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return 0, ErrAllPortsAllocated
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}
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}
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mapping[proto][port] = true
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return port, nil
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}
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func nextPort(proto string) int {
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c := currentDynamicPort[proto] + 1
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if c > EndPortRange {
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c = BeginPortRange
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func getDefault(ip net.IP) net.IP {
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if ip == nil {
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return defaultIP
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}
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currentDynamicPort[proto] = c
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return c
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return ip
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}
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func registerIP(ip net.IP) {
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if _, exists := otherAllocatedPorts[ip.String()]; !exists {
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otherAllocatedPorts[ip.String()] = portMappings{
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"tcp": collections.NewOrderedIntSet(),
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"udp": collections.NewOrderedIntSet(),
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}
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}
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}
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func validateProtocol(proto string) error {
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if _, exists := defaultAllocatedPorts[proto]; !exists {
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func validateProto(proto string) error {
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if proto != "tcp" && proto != "udp" {
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return ErrUnknownProtocol
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}
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return nil
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}
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