131 lines
3.6 KiB
Go
131 lines
3.6 KiB
Go
package ipamplugin
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import (
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"fmt"
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"net"
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"strings"
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"github.com/docker/libnetwork/discoverapi"
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"github.com/docker/libnetwork/netlabel"
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"github.com/weaveworks/weave/api"
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"github.com/weaveworks/weave/common"
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)
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type Ipam struct {
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weave *api.Client
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}
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func NewIpam(weave *api.Client) *Ipam {
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return &Ipam{weave: weave}
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}
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func (i *Ipam) GetDefaultAddressSpaces() (string, string, error) {
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i.logReq("GetDefaultAddressSpaces")
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return "weavelocal", "weaveglobal", nil
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}
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func (i *Ipam) RequestPool(addressSpace, pool, subPool string, options map[string]string, v6 bool) (poolname string, subnet *net.IPNet, data map[string]string, err error) {
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i.logReq("RequestPool", addressSpace, pool, subPool, options)
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defer func() { i.logRes("RequestPool", err, poolname, subnet, data) }()
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if pool == "" {
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subnet, err = i.weave.DefaultSubnet()
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} else {
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_, subnet, err = net.ParseCIDR(pool)
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}
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if err != nil {
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return
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}
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iprange := subnet
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if subPool != "" {
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if _, iprange, err = net.ParseCIDR(subPool); err != nil {
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return
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}
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}
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// Cunningly-constructed pool "name" which gives us what we need later
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poolname = strings.Join([]string{"weave", subnet.String(), iprange.String()}, "-")
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// Pass back a fake "gateway address"; we don't actually use it,
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// so just give the network address.
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data = map[string]string{netlabel.Gateway: subnet.String()}
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return
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}
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func (i *Ipam) ReleasePool(poolID string) error {
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i.logReq("ReleasePool", poolID)
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return nil
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}
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func splitPoolID(poolID string) (subnet, iprange *net.IPNet, err error) {
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parts := strings.Split(poolID, "-")
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if len(parts) != 3 || parts[0] != "weave" {
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err = fmt.Errorf("Unrecognized pool ID: %s", poolID)
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return
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}
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if _, subnet, err = net.ParseCIDR(parts[1]); err != nil {
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return
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}
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if _, iprange, err = net.ParseCIDR(parts[2]); err != nil {
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return
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}
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return
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}
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func (i *Ipam) RequestAddress(poolID string, address net.IP, options map[string]string) (ip *net.IPNet, _ map[string]string, err error) {
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i.logReq("RequestAddress", poolID, address, options)
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defer func() { i.logRes("RequestAddress", err, ip) }()
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if poolID == "weavepool" { // old-style
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ip, err = i.weave.AllocateIP(api.NoContainerID)
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return
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}
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subnet, iprange, err := splitPoolID(poolID)
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if err != nil {
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return
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}
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if address != nil { // try to claim specific address requested
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ip = &net.IPNet{IP: address, Mask: subnet.Mask}
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if err = i.weave.ClaimIP(api.NoContainerID, ip); err != nil {
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return
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}
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} else {
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// We are lying slightly to IPAM here: the range is not a subnet
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if ip, err = i.weave.AllocateIPInSubnet(api.NoContainerID, iprange); err != nil {
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return
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}
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ip.Mask = subnet.Mask // fix up the subnet we lied about
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}
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return
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}
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func (i *Ipam) ReleaseAddress(poolID string, address net.IP) error {
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i.logReq("ReleaseAddress", poolID, address)
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if subnet, _, err := splitPoolID(poolID); err != nil {
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return err
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} else if address.Equal(subnet.IP) { // is it the gateway address we faked earlier?
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return nil
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}
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return i.weave.ReleaseIPsFor(address.String())
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}
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// Functions required by ipamapi "contract" but not actually used.
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func (i *Ipam) DiscoverNew(discoverapi.DiscoveryType, interface{}) error {
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return nil
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}
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func (i *Ipam) DiscoverDelete(discoverapi.DiscoveryType, interface{}) error {
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return nil
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}
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// logging
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func (i *Ipam) logReq(fun string, args ...interface{}) {
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common.Log.Infoln(append([]interface{}{fmt.Sprintf("[ipam] %s", fun)}, args...)...)
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}
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func (i *Ipam) logRes(fun string, err error, args ...interface{}) {
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if err == nil {
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common.Log.Debugln(append([]interface{}{fmt.Sprintf("[ipam] %s result", fun)}, args...)...)
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return
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}
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common.Log.Errorf("[ipam] %s: %s", fun, err)
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}
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