forked from mcuadros/passage
/
remote.go
152 lines (125 loc) · 2.81 KB
/
remote.go
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package core
import (
"encoding/json"
"fmt"
"net"
"net/http"
"time"
)
type Remote interface {
Addr(SSHConnection) (net.Addr, error)
fmt.Stringer
}
type addressRemote struct {
network string
address string
}
func NewRemote(network, address string) Remote {
return &addressRemote{
network: network,
address: address,
}
}
func (r *addressRemote) Addr(SSHConnection) (net.Addr, error) {
return net.ResolveTCPAddr(r.network, r.address)
}
func (r *addressRemote) String() string {
return fmt.Sprintf("%s/%s", r.address, r.network)
}
type containerRemote struct {
network string
container string
address string
port string
}
func NewContainerRemote(network, container, port string) Remote {
return &containerRemote{
network: network,
container: container,
port: port,
}
}
func (r *containerRemote) Addr(s SSHConnection) (net.Addr, error) {
c := r.buildClient(s)
if err := r.getContainerIP(c); err != nil {
return nil, err
}
return net.ResolveTCPAddr("tcp", net.JoinHostPort(r.address, r.port))
}
func (r *containerRemote) buildClient(s SSHConnection) *http.Client {
return &http.Client{
Transport: &http.Transport{
ResponseHeaderTimeout: time.Second * 2,
Dial: func(network, address string) (net.Conn, error) {
a, err := net.ResolveTCPAddr(network, address)
if err != nil {
return nil, err
}
return s.Conn(a)
},
},
}
}
func (r *containerRemote) getContainerIP(c *http.Client) error {
l, err := r.getContainers(c)
if err != nil {
return err
}
container, err := r.matchContainer(l)
if err != nil {
return err
}
n, ok := container.NetworkSettings.Networks["bridge"]
if !ok {
return fmt.Errorf("container: not supported networks")
}
r.address = n.IPAddress
return nil
}
type container struct {
Names []string
NetworkSettings struct {
Networks map[string]struct {
IPAddress string
}
}
}
func (r *containerRemote) matchContainer(l []*container) (*container, error) {
var container *container
for _, c := range l {
for _, name := range c.Names {
if name == fmt.Sprintf("/%s", r.container) {
container = c
}
}
}
if container == nil {
return nil, fmt.Errorf("container %q not found", r.container)
}
return container, nil
}
func (r *containerRemote) getContainers(c *http.Client) ([]*container, error) {
req, err := http.NewRequest("GET", "http://localhost:2375/containers/json", nil)
if err != nil {
return nil, err
}
res, err := c.Do(req)
if err != nil {
return nil, err
}
dec := json.NewDecoder(res.Body)
defer res.Body.Close()
result := []*container{}
err = dec.Decode(&result)
if err != nil {
return nil, err
}
return result, nil
}
func (r *containerRemote) String() string {
a := r.address
if a == "" {
a = ":"
}
return fmt.Sprintf("<container=%s>%s:%s/%s", r.container, a, r.port, r.network)
}