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moby--moby/nat/nat.go
Solomon Hykes 3ecd8ff0c8 New package nat: utilities for manipulating the text description of network ports.
This facilitates the refactoring of commands.go

Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes)
2014-02-11 16:51:01 -08:00

133 lines
2.9 KiB
Go

package nat
// nat is a convenience package for docker's manipulation of strings describing
// network ports.
import (
"fmt"
"github.com/dotcloud/docker/utils"
"strconv"
"strings"
)
const (
PortSpecTemplate = "ip:hostPort:containerPort"
PortSpecTemplateFormat = "ip:hostPort:containerPort | ip::containerPort | hostPort:containerPort"
)
type PortBinding struct {
HostIp string
HostPort string
}
type PortMap map[Port][]PortBinding
type PortSet map[Port]struct{}
// 80/tcp
type Port string
func NewPort(proto, port string) Port {
return Port(fmt.Sprintf("%s/%s", port, proto))
}
func ParsePort(rawPort string) (int, error) {
port, err := strconv.ParseUint(rawPort, 10, 16)
if err != nil {
return 0, err
}
return int(port), nil
}
func (p Port) Proto() string {
parts := strings.Split(string(p), "/")
if len(parts) == 1 {
return "tcp"
}
return parts[1]
}
func (p Port) Port() string {
return strings.Split(string(p), "/")[0]
}
func (p Port) Int() int {
i, err := ParsePort(p.Port())
if err != nil {
panic(err)
}
return i
}
// Splits a port in the format of port/proto
func SplitProtoPort(rawPort string) (string, string) {
parts := strings.Split(rawPort, "/")
l := len(parts)
if l == 0 {
return "", ""
}
if l == 1 {
return "tcp", rawPort
}
return parts[0], parts[1]
}
// We will receive port specs in the format of ip:public:private/proto and these need to be
// parsed in the internal types
func ParsePortSpecs(ports []string) (map[Port]struct{}, map[Port][]PortBinding, error) {
var (
exposedPorts = make(map[Port]struct{}, len(ports))
bindings = make(map[Port][]PortBinding)
)
for _, rawPort := range ports {
proto := "tcp"
if i := strings.LastIndex(rawPort, "/"); i != -1 {
proto = rawPort[i+1:]
rawPort = rawPort[:i]
}
if !strings.Contains(rawPort, ":") {
rawPort = fmt.Sprintf("::%s", rawPort)
} else if len(strings.Split(rawPort, ":")) == 2 {
rawPort = fmt.Sprintf(":%s", rawPort)
}
parts, err := utils.PartParser(PortSpecTemplate, rawPort)
if err != nil {
return nil, nil, err
}
var (
containerPort = parts["containerPort"]
rawIp = parts["ip"]
hostPort = parts["hostPort"]
)
if containerPort == "" {
return nil, nil, fmt.Errorf("No port specified: %s<empty>", rawPort)
}
if _, err := strconv.ParseUint(containerPort, 10, 16); err != nil {
return nil, nil, fmt.Errorf("Invalid containerPort: %s", containerPort)
}
if _, err := strconv.ParseUint(hostPort, 10, 16); hostPort != "" && err != nil {
return nil, nil, fmt.Errorf("Invalid hostPort: %s", hostPort)
}
port := NewPort(proto, containerPort)
if _, exists := exposedPorts[port]; !exists {
exposedPorts[port] = struct{}{}
}
binding := PortBinding{
HostIp: rawIp,
HostPort: hostPort,
}
bslice, exists := bindings[port]
if !exists {
bslice = []PortBinding{}
}
bindings[port] = append(bslice, binding)
}
return exposedPorts, bindings, nil
}