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moby--moby/daemon/network.go
David Calavera 669949d6b4 Decouple daemon and container to manage networks.
Signed-off-by: David Calavera <david.calavera@gmail.com>
2015-11-04 12:27:48 -05:00

148 lines
4.2 KiB
Go

package daemon
import (
"errors"
"fmt"
"net"
"strings"
"github.com/docker/docker/daemon/network"
"github.com/docker/libnetwork"
)
const (
// NetworkByID represents a constant to find a network by its ID
NetworkByID = iota + 1
// NetworkByName represents a constant to find a network by its Name
NetworkByName
)
// NetworkControllerEnabled checks if the networking stack is enabled.
// This feature depends on OS primitives and it's dissabled in systems like Windows.
func (daemon *Daemon) NetworkControllerEnabled() bool {
return daemon.netController != nil
}
// FindNetwork function finds a network for a given string that can represent network name or id
func (daemon *Daemon) FindNetwork(idName string) (libnetwork.Network, error) {
// Find by Name
n, err := daemon.GetNetwork(idName, NetworkByName)
if _, ok := err.(libnetwork.ErrNoSuchNetwork); err != nil && !ok {
return nil, err
}
if n != nil {
return n, nil
}
// Find by id
n, err = daemon.GetNetwork(idName, NetworkByID)
if err != nil {
return nil, err
}
return n, nil
}
// GetNetwork function returns a network for a given string that represents the network and
// a hint to indicate if the string is an Id or Name of the network
func (daemon *Daemon) GetNetwork(idName string, by int) (libnetwork.Network, error) {
c := daemon.netController
switch by {
case NetworkByID:
list := daemon.GetNetworksByID(idName)
if len(list) == 0 {
return nil, libnetwork.ErrNoSuchNetwork(idName)
}
if len(list) > 1 {
return nil, libnetwork.ErrInvalidID(idName)
}
return list[0], nil
case NetworkByName:
if idName == "" {
idName = c.Config().Daemon.DefaultNetwork
}
return c.NetworkByName(idName)
}
return nil, errors.New("unexpected selector for GetNetwork")
}
// GetNetworksByID returns a list of networks whose ID partially matches zero or more networks
func (daemon *Daemon) GetNetworksByID(partialID string) []libnetwork.Network {
c := daemon.netController
list := []libnetwork.Network{}
l := func(nw libnetwork.Network) bool {
if strings.HasPrefix(nw.ID(), partialID) {
list = append(list, nw)
}
return false
}
c.WalkNetworks(l)
return list
}
// CreateNetwork creates a network with the given name, driver and other optional parameters
func (daemon *Daemon) CreateNetwork(name, driver string, ipam network.IPAM, options map[string]string) (libnetwork.Network, error) {
c := daemon.netController
if driver == "" {
driver = c.Config().Daemon.DefaultDriver
}
nwOptions := []libnetwork.NetworkOption{}
v4Conf, v6Conf, err := getIpamConfig(ipam.Config)
if err != nil {
return nil, err
}
nwOptions = append(nwOptions, libnetwork.NetworkOptionIpam(ipam.Driver, "", v4Conf, v6Conf))
nwOptions = append(nwOptions, libnetwork.NetworkOptionDriverOpts(options))
return c.NewNetwork(driver, name, nwOptions...)
}
func getIpamConfig(data []network.IPAMConfig) ([]*libnetwork.IpamConf, []*libnetwork.IpamConf, error) {
ipamV4Cfg := []*libnetwork.IpamConf{}
ipamV6Cfg := []*libnetwork.IpamConf{}
for _, d := range data {
iCfg := libnetwork.IpamConf{}
iCfg.PreferredPool = d.Subnet
iCfg.SubPool = d.IPRange
iCfg.Gateway = d.Gateway
iCfg.AuxAddresses = d.AuxAddress
ip, _, err := net.ParseCIDR(d.Subnet)
if err != nil {
return nil, nil, fmt.Errorf("Invalid subnet %s : %v", d.Subnet, err)
}
if ip.To4() != nil {
ipamV4Cfg = append(ipamV4Cfg, &iCfg)
} else {
ipamV6Cfg = append(ipamV6Cfg, &iCfg)
}
}
return ipamV4Cfg, ipamV6Cfg, nil
}
// ConnectContainerToNetwork connects the given container to the given
// network. If either cannot be found, an err is returned. If the
// network cannot be set up, an err is returned.
func (daemon *Daemon) ConnectContainerToNetwork(containerName, networkName string) error {
container, err := daemon.Get(containerName)
if err != nil {
return err
}
return daemon.ConnectToNetwork(container, networkName)
}
// DisconnectContainerFromNetwork disconnects the given container from
// the given network. If either cannot be found, an err is returned.
func (daemon *Daemon) DisconnectContainerFromNetwork(containerName string, network libnetwork.Network) error {
container, err := daemon.Get(containerName)
if err != nil {
return err
}
return container.DisconnectFromNetwork(network)
}