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package createconfig
import (
"fmt"
"net"
"strconv"
"github.com/docker/go-connections/nat"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
// ExposedPorts parses user and image ports and returns binding information
func ExposedPorts(expose, publish []string, publishAll bool, imageExposedPorts map[string]struct{}) (map[nat.Port][]nat.PortBinding, error) {
containerPorts := make(map[string]string)
// add expose ports from the image itself
for expose := range imageExposedPorts {
_, port := nat.SplitProtoPort(expose)
containerPorts[port] = ""
}
// add the expose ports from the user (--expose)
// can be single or a range
for _, expose := range expose {
//support two formats for expose, original format <portnum>/[<proto>] or <startport-endport>/[<proto>]
_, port := nat.SplitProtoPort(expose)
//parse the start and end port and create a sequence of ports to expose
//if expose a port, the start and end port are the same
start, end, err := nat.ParsePortRange(port)
if err != nil {
return nil, fmt.Errorf("invalid range format for --expose: %s, error: %s", expose, err)
}
for i := start; i <= end; i++ {
containerPorts[strconv.Itoa(int(i))] = ""
}
}
// parse user inputted port bindings
pbPorts, portBindings, err := nat.ParsePortSpecs(publish)
if err != nil {
return nil, err
}
// delete exposed container ports if being used by -p
for i := range pbPorts {
delete(containerPorts, i.Port())
}
// iterate container ports and make port bindings from them
if publishAll {
for e := range containerPorts {
//support two formats for expose, original format <portnum>/[<proto>] or <startport-endport>/[<proto>]
//proto, port := nat.SplitProtoPort(e)
p, err := nat.NewPort("tcp", e)
if err != nil {
return nil, err
}
rp, err := getRandomPort()
if err != nil {
return nil, err
}
logrus.Debug(fmt.Sprintf("Using random host port %d with container port %d", rp, p.Int()))
portBindings[p] = CreatePortBinding(rp, "")
}
}
// We need to see if any host ports are not populated and if so, we need to assign a
// random port to them.
for k, pb := range portBindings {
if pb[0].HostPort == "" {
hostPort, err := getRandomPort()
if err != nil {
return nil, err
}
logrus.Debug(fmt.Sprintf("Using random host port %d with container port %s", hostPort, k.Port()))
pb[0].HostPort = strconv.Itoa(hostPort)
}
}
return portBindings, nil
}
func getRandomPort() (int, error) {
l, err := net.Listen("tcp", ":0")
if err != nil {
return 0, errors.Wrapf(err, "unable to get free port")
}
defer l.Close()
_, randomPort, err := net.SplitHostPort(l.Addr().String())
if err != nil {
return 0, errors.Wrapf(err, "unable to determine free port")
}
rp, err := strconv.Atoi(randomPort)
if err != nil {
return 0, errors.Wrapf(err, "unable to convert random port to int")
}
return rp, nil
}
//CreatePortBinding takes port (int) and IP (string) and creates an array of portbinding structs
func CreatePortBinding(hostPort int, hostIP string) []nat.PortBinding {
pb := nat.PortBinding{
HostPort: strconv.Itoa(hostPort),
}
pb.HostIP = hostIP
return []nat.PortBinding{pb}
}
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