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// This code is copied from https://github.com/rootless-containers/rootlesskit/blob/master/pkg/api/client/client.go v0.14.6
// The code is licensed under Apache-2.0
package client
import (
"bytes"
"context"
"encoding/json"
"errors"
"fmt"
"io"
"net"
"net/http"
"os"
"github.com/rootless-containers/bypass4netns/pkg/api"
)
type Client interface {
HTTPClient() *http.Client
BypassManager() *BypassManager
}
// New creates a client.
// socketPath is a path to the UNIX socket, without unix:// prefix.
func New(socketPath string) (Client, error) {
if _, err := os.Stat(socketPath); err != nil {
return nil, err
}
hc := &http.Client{
Transport: &http.Transport{
DialContext: func(ctx context.Context, _, _ string) (net.Conn, error) {
var d net.Dialer
return d.DialContext(ctx, "unix", socketPath)
},
},
}
return NewWithHTTPClient(hc), nil
}
func NewWithHTTPClient(hc *http.Client) Client {
return &client{
Client: hc,
version: "v1",
dummyHost: "bypass4netnsd",
}
}
type client struct {
*http.Client
// version is always "v1"
// TODO(AkihiroSuda): negotiate the version
version string
dummyHost string
}
func (c *client) HTTPClient() *http.Client {
return c.Client
}
func (c *client) BypassManager() *BypassManager {
return &BypassManager{
client: c,
}
}
func readAtMost(r io.Reader, maxBytes int) ([]byte, error) {
lr := &io.LimitedReader{
R: r,
N: int64(maxBytes),
}
b, err := io.ReadAll(lr)
if err != nil {
return b, err
}
if lr.N == 0 {
return b, fmt.Errorf("expected at most %d bytes, got more", maxBytes)
}
return b, nil
}
// HTTPStatusErrorBodyMaxLength specifies the maximum length of HTTPStatusError.Body
const HTTPStatusErrorBodyMaxLength = 64 * 1024
// HTTPStatusError is created from non-2XX HTTP response
type HTTPStatusError struct {
// StatusCode is non-2XX status code
StatusCode int
// Body is at most HTTPStatusErrorBodyMaxLength
Body string
}
// Error implements error.
// If e.Body is a marshalled string of api.ErrorJSON, Error returns ErrorJSON.Message .
// Otherwise Error returns a human-readable string that contains e.StatusCode and e.Body.
func (e *HTTPStatusError) Error() string {
if e.Body != "" && len(e.Body) < HTTPStatusErrorBodyMaxLength {
var ej api.ErrorJSON
if json.Unmarshal([]byte(e.Body), &ej) == nil {
return ej.Message
}
}
return fmt.Sprintf("unexpected HTTP status %s, body=%q", http.StatusText(e.StatusCode), e.Body)
}
func successful(resp *http.Response) error {
if resp == nil {
return errors.New("nil response")
}
if resp.StatusCode/100 != 2 {
b, _ := readAtMost(resp.Body, HTTPStatusErrorBodyMaxLength)
return &HTTPStatusError{
StatusCode: resp.StatusCode,
Body: string(b),
}
}
return nil
}
type BypassManager struct {
*client
}
func (bm *BypassManager) StartBypass(ctx context.Context, spec api.BypassSpec) (*api.BypassStatus, error) {
m, err := json.Marshal(spec)
if err != nil {
return nil, err
}
u := fmt.Sprintf("http://%s/%s/bypass", bm.client.dummyHost, bm.client.version)
req, err := http.NewRequest("POST", u, bytes.NewReader(m))
if err != nil {
return nil, err
}
req.Header.Set("Content-Type", "application/json")
req = req.WithContext(ctx)
resp, err := bm.client.HTTPClient().Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
if err := successful(resp); err != nil {
return nil, err
}
dec := json.NewDecoder(resp.Body)
var status api.BypassStatus
if err := dec.Decode(&status); err != nil {
return nil, err
}
return &status, nil
}
func (bm *BypassManager) ListBypass(ctx context.Context) ([]api.BypassStatus, error) {
u := fmt.Sprintf("http://%s/%s/bypass", bm.client.dummyHost, bm.client.version)
req, err := http.NewRequest("GET", u, nil)
if err != nil {
return nil, err
}
req = req.WithContext(ctx)
resp, err := bm.client.HTTPClient().Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
if err := successful(resp); err != nil {
return nil, err
}
var statuses []api.BypassStatus
dec := json.NewDecoder(resp.Body)
if err := dec.Decode(&statuses); err != nil {
return nil, err
}
return statuses, nil
}
func (bm *BypassManager) StopBypass(ctx context.Context, id string) error {
u := fmt.Sprintf("http://%s/%s/bypass/%s", bm.client.dummyHost, bm.client.version, id)
req, err := http.NewRequest("DELETE", u, nil)
if err != nil {
return err
}
req = req.WithContext(ctx)
resp, err := bm.client.HTTPClient().Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
if err := successful(resp); err != nil {
return err
}
return nil
}
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