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// Copyright 2020 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package dockerutil
import (
"context"
"net"
"github.com/docker/docker/api/types"
"github.com/docker/docker/api/types/network"
"github.com/docker/docker/client"
"gvisor.dev/gvisor/pkg/test/testutil"
)
// Network is a docker network.
type Network struct {
client *client.Client
id string
logger testutil.Logger
Name string
containers []*Container
Subnet *net.IPNet
}
// NewNetwork sets up the struct for a Docker network. Names of networks
// will be unique.
func NewNetwork(ctx context.Context, logger testutil.Logger) *Network {
client, err := client.NewClientWithOpts(client.FromEnv)
if err != nil {
logger.Logf("create client failed with: %v", err)
return nil
}
client.NegotiateAPIVersion(ctx)
return &Network{
logger: logger,
Name: testutil.RandomID(logger.Name()),
client: client,
}
}
func (n *Network) networkCreate() types.NetworkCreate {
var subnet string
if n.Subnet != nil {
subnet = n.Subnet.String()
}
ipam := network.IPAM{
Config: []network.IPAMConfig{{
Subnet: subnet,
}},
}
return types.NetworkCreate{
CheckDuplicate: true,
IPAM: &ipam,
}
}
// Create is analogous to 'docker network create'.
func (n *Network) Create(ctx context.Context) error {
opts := n.networkCreate()
resp, err := n.client.NetworkCreate(ctx, n.Name, opts)
if err != nil {
return err
}
n.id = resp.ID
return nil
}
// Connect is analogous to 'docker network connect' with the arguments provided.
func (n *Network) Connect(ctx context.Context, container *Container, ipv4, ipv6 string) error {
settings := network.EndpointSettings{
IPAMConfig: &network.EndpointIPAMConfig{
IPv4Address: ipv4,
IPv6Address: ipv6,
},
}
err := n.client.NetworkConnect(ctx, n.id, container.id, &settings)
if err == nil {
n.containers = append(n.containers, container)
}
return err
}
// Inspect returns this network's info.
func (n *Network) Inspect(ctx context.Context) (types.NetworkResource, error) {
return n.client.NetworkInspect(ctx, n.id, types.NetworkInspectOptions{Verbose: true})
}
// Cleanup cleans up the docker network.
func (n *Network) Cleanup(ctx context.Context) error {
n.containers = nil
return n.client.NetworkRemove(ctx, n.id)
}
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