176 lines
3.7 KiB
Go
176 lines
3.7 KiB
Go
// Copyright 2017 AMIS Technologies
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package container
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import (
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"context"
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"errors"
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"fmt"
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"net"
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"sync"
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"time"
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"github.com/docker/docker/api/types"
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"github.com/docker/docker/api/types/network"
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"github.com/docker/docker/client"
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)
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const (
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FirstOctet = 172
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SecondOctet = 17
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networkNamePrefix = "testnet"
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)
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type NetworkManager interface {
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TryGetFreeSubnet() string
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}
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var defaultNetworkManager = newNetworkManager()
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func newNetworkManager() *networkManager {
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return &networkManager{
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secondOctet: SecondOctet,
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}
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}
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type networkManager struct {
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mutex sync.Mutex
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secondOctet int
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}
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func (n *networkManager) TryGetFreeSubnet() string {
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n.mutex.Lock()
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defer n.mutex.Unlock()
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n.secondOctet++
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return fmt.Sprintf("%d.%d.0.0/16", FirstOctet, n.secondOctet)
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}
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type DockerNetwork struct {
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client *client.Client
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id string
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name string
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ipv4Net *net.IPNet
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mutex sync.Mutex
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ipIndex net.IP
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}
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func NewDockerNetwork() (*DockerNetwork, error) {
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c, err := client.NewEnvClient()
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if err != nil {
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return nil, err
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}
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network := &DockerNetwork{
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client: c,
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}
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if err := network.create(); err != nil {
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return nil, err
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}
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return network, nil
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}
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// create creates a user-defined docker network
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func (n *DockerNetwork) create() error {
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n.name = fmt.Sprintf("%s%d", networkNamePrefix, time.Now().Unix())
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var maxTryCount = 15
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var err error
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var cResp types.NetworkCreateResponse
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var subnet string
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for i := 0; i < maxTryCount && n.id == ""; i++ {
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subnet = defaultNetworkManager.TryGetFreeSubnet()
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ipam := &network.IPAM{
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Config: []network.IPAMConfig{
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network.IPAMConfig{
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Subnet: subnet,
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},
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},
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}
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cResp, err = n.client.NetworkCreate(context.Background(), n.name, types.NetworkCreate{
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IPAM: ipam,
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})
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if err == nil {
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break
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}
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}
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if err != nil {
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return err
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}
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n.id = cResp.ID
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_, n.ipv4Net, err = net.ParseCIDR(subnet)
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if err != nil {
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return err
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}
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// IP starts with xxx.xxx.0.1
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// Because xxx.xxx.0.1 is reserved for default Gateway IP
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n.ipIndex = net.IPv4(n.ipv4Net.IP[0], n.ipv4Net.IP[1], 0, 1)
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return nil
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}
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func (n *DockerNetwork) ID() string {
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return n.id
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}
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func (n *DockerNetwork) Name() string {
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return n.name
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}
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func (n *DockerNetwork) Subnet() string {
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return n.ipv4Net.String()
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}
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func (n *DockerNetwork) Remove() error {
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return n.client.NetworkRemove(context.Background(), n.id)
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}
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func (n *DockerNetwork) GetFreeIPAddrs(num int) ([]net.IP, error) {
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n.mutex.Lock()
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defer n.mutex.Unlock()
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ips := make([]net.IP, 0)
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for len(ips) < num && n.ipv4Net.Contains(n.ipIndex) {
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ip := dupIP(n.ipIndex)
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for j := len(ip) - 1; j >= 0; j-- {
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ip[j]++
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if ip[j] > 0 {
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break
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}
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}
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n.ipIndex = ip
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ips = append(ips, ip)
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}
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if len(ips) != num {
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return nil, errors.New("insufficient IP address.")
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}
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return ips, nil
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}
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func dupIP(ip net.IP) net.IP {
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// To save space, try and only use 4 bytes
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if x := ip.To4(); x != nil {
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ip = x
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}
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dup := make(net.IP, len(ip))
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copy(dup, ip)
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return dup
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}
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