portallocator

Documentation

Index

• Constants
• Variables
• type ErrPortAlreadyAllocated
  • func (e ErrPortAlreadyAllocated) Error() string
  • func (e ErrPortAlreadyAllocated) IP() string
  • func (e ErrPortAlreadyAllocated) IPPort() string
  • func (e ErrPortAlreadyAllocated) Port() int
• type PortAllocator
  • func Get() *PortAllocator
  • func (p *PortAllocator) ReleaseAll() error
  • func (p *PortAllocator) ReleasePort(ip net.IP, proto string, port int) error
  • func (p *PortAllocator) RequestPort(ip net.IP, proto string, port int) (int, error)
  • func (p *PortAllocator) RequestPortInRange(ip net.IP, proto string, portStart, portEnd int) (int, error)

Constants

const (
	// DefaultPortRangeStart indicates the first port in port range
	DefaultPortRangeStart = 49153
	// DefaultPortRangeEnd indicates the last port in port range
	DefaultPortRangeEnd = 65535
)

Variables

var (
	// ErrAllPortsAllocated is returned when no more ports are available
	ErrAllPortsAllocated = errors.New("all ports are allocated")
	// ErrUnknownProtocol is returned when an unknown protocol was specified
	ErrUnknownProtocol = errors.New("unknown protocol")
)

Types

type ErrPortAlreadyAllocated

type ErrPortAlreadyAllocated struct {
	// contains filtered or unexported fields
}

ErrPortAlreadyAllocated is the returned error information when a requested port is already being used

func (ErrPortAlreadyAllocated) Error

func (e ErrPortAlreadyAllocated) Error() string

Error is the implementation of error.Error interface

func (ErrPortAlreadyAllocated) IP

func (e ErrPortAlreadyAllocated) IP() string

IP returns the address to which the used port is associated

func (ErrPortAlreadyAllocated) IPPort

func (e ErrPortAlreadyAllocated) IPPort() string

IPPort returns the address and the port in the form ip:port

func (ErrPortAlreadyAllocated) Port

func (e ErrPortAlreadyAllocated) Port() int

Port returns the value of the already used port

type PortAllocator

type PortAllocator struct {
	Begin int
	End   int
	// contains filtered or unexported fields
}

PortAllocator manages the transport ports database

func Get

func Get() *PortAllocator

Get returns the default instance of PortAllocator

func (*PortAllocator) ReleaseAll

func (p *PortAllocator) ReleaseAll() error

ReleaseAll releases all ports for all ips.

func (*PortAllocator) ReleasePort

func (p *PortAllocator) ReleasePort(ip net.IP, proto string, port int) error

ReleasePort releases port from global ports pool for specified ip and proto.

func (*PortAllocator) RequestPort

func (p *PortAllocator) RequestPort(ip net.IP, proto string, port int) (int, error)

RequestPort requests new port from global ports pool for specified ip and proto. If port is 0 it returns first free port. Otherwise it checks port availability in proto's pool and returns that port or error if port is already busy.

func (*PortAllocator) RequestPortInRange

func (p *PortAllocator) RequestPortInRange(ip net.IP, proto string, portStart, portEnd int) (int, error)

RequestPortInRange requests new port from global ports pool for specified ip and proto. If portStart and portEnd are 0 it returns the first free port in the default ephemeral range. If portStart != portEnd it returns the first free port in the requested range. Otherwise (portStart == portEnd) it checks port availability in the requested proto's port-pool and returns that port or error if port is already busy.