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moby--moby/integration-cli/docker_api_attach_test.go

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package main
import (
"bufio"
"bytes"
"context"
"fmt"
"io"
"net"
"net/http"
"net/http/httputil"
"strings"
"time"
"github.com/docker/docker/api/types"
"github.com/docker/docker/client"
"github.com/docker/docker/integration-cli/checker"
"github.com/docker/docker/internal/test/request"
"github.com/docker/docker/pkg/stdcopy"
"github.com/go-check/check"
"github.com/pkg/errors"
"golang.org/x/net/websocket"
)
func (s *DockerSuite) TestGetContainersAttachWebsocket(c *check.C) {
testRequires(c, DaemonIsLinux)
out, _ := dockerCmd(c, "run", "-dit", "busybox", "cat")
rwc, err := request.SockConn(time.Duration(10*time.Second), daemonHost())
c.Assert(err, checker.IsNil)
cleanedContainerID := strings.TrimSpace(out)
config, err := websocket.NewConfig(
"/containers/"+cleanedContainerID+"/attach/ws?stream=1&stdin=1&stdout=1&stderr=1",
"http://localhost",
)
c.Assert(err, checker.IsNil)
ws, err := websocket.NewClient(config, rwc)
c.Assert(err, checker.IsNil)
defer ws.Close()
expected := []byte("hello")
actual := make([]byte, len(expected))
outChan := make(chan error)
go func() {
_, err := io.ReadFull(ws, actual)
outChan <- err
close(outChan)
}()
inChan := make(chan error)
go func() {
_, err := ws.Write(expected)
inChan <- err
close(inChan)
}()
select {
case err := <-inChan:
c.Assert(err, checker.IsNil)
case <-time.After(5 * time.Second):
c.Fatal("Timeout writing to ws")
}
select {
case err := <-outChan:
c.Assert(err, checker.IsNil)
case <-time.After(5 * time.Second):
c.Fatal("Timeout reading from ws")
}
c.Assert(actual, checker.DeepEquals, expected, check.Commentf("Websocket didn't return the expected data"))
}
// regression gh14320
func (s *DockerSuite) TestPostContainersAttachContainerNotFound(c *check.C) {
resp, _, err := request.Post("/containers/doesnotexist/attach")
c.Assert(err, checker.IsNil)
// connection will shutdown, err should be "persistent connection closed"
c.Assert(resp.StatusCode, checker.Equals, http.StatusNotFound)
content, err := request.ReadBody(resp.Body)
c.Assert(err, checker.IsNil)
expected := "No such container: doesnotexist\r\n"
c.Assert(string(content), checker.Equals, expected)
}
func (s *DockerSuite) TestGetContainersWsAttachContainerNotFound(c *check.C) {
res, body, err := request.Get("/containers/doesnotexist/attach/ws")
c.Assert(res.StatusCode, checker.Equals, http.StatusNotFound)
c.Assert(err, checker.IsNil)
b, err := request.ReadBody(body)
c.Assert(err, checker.IsNil)
expected := "No such container: doesnotexist"
c.Assert(getErrorMessage(c, b), checker.Contains, expected)
}
func (s *DockerSuite) TestPostContainersAttach(c *check.C) {
testRequires(c, DaemonIsLinux)
expectSuccess := func(conn net.Conn, br *bufio.Reader, stream string, tty bool) {
defer conn.Close()
expected := []byte("success")
_, err := conn.Write(expected)
c.Assert(err, checker.IsNil)
conn.SetReadDeadline(time.Now().Add(time.Second))
lenHeader := 0
if !tty {
lenHeader = 8
}
actual := make([]byte, len(expected)+lenHeader)
_, err = io.ReadFull(br, actual)
c.Assert(err, checker.IsNil)
if !tty {
fdMap := map[string]byte{
"stdin": 0,
"stdout": 1,
"stderr": 2,
}
c.Assert(actual[0], checker.Equals, fdMap[stream])
}
c.Assert(actual[lenHeader:], checker.DeepEquals, expected, check.Commentf("Attach didn't return the expected data from %s", stream))
}
expectTimeout := func(conn net.Conn, br *bufio.Reader, stream string) {
defer conn.Close()
_, err := conn.Write([]byte{'t'})
c.Assert(err, checker.IsNil)
conn.SetReadDeadline(time.Now().Add(time.Second))
actual := make([]byte, 1)
_, err = io.ReadFull(br, actual)
opErr, ok := err.(*net.OpError)
c.Assert(ok, checker.Equals, true, check.Commentf("Error is expected to be *net.OpError, got %v", err))
c.Assert(opErr.Timeout(), checker.Equals, true, check.Commentf("Read from %s is expected to timeout", stream))
}
// Create a container that only emits stdout.
cid, _ := dockerCmd(c, "run", "-di", "busybox", "cat")
cid = strings.TrimSpace(cid)
// Attach to the container's stdout stream.
conn, br, err := sockRequestHijack("POST", "/containers/"+cid+"/attach?stream=1&stdin=1&stdout=1", nil, "text/plain", daemonHost())
c.Assert(err, checker.IsNil)
// Check if the data from stdout can be received.
expectSuccess(conn, br, "stdout", false)
// Attach to the container's stderr stream.
conn, br, err = sockRequestHijack("POST", "/containers/"+cid+"/attach?stream=1&stdin=1&stderr=1", nil, "text/plain", daemonHost())
c.Assert(err, checker.IsNil)
// Since the container only emits stdout, attaching to stderr should return nothing.
expectTimeout(conn, br, "stdout")
// Test the similar functions of the stderr stream.
cid, _ = dockerCmd(c, "run", "-di", "busybox", "/bin/sh", "-c", "cat >&2")
cid = strings.TrimSpace(cid)
conn, br, err = sockRequestHijack("POST", "/containers/"+cid+"/attach?stream=1&stdin=1&stderr=1", nil, "text/plain", daemonHost())
c.Assert(err, checker.IsNil)
expectSuccess(conn, br, "stderr", false)
conn, br, err = sockRequestHijack("POST", "/containers/"+cid+"/attach?stream=1&stdin=1&stdout=1", nil, "text/plain", daemonHost())
c.Assert(err, checker.IsNil)
expectTimeout(conn, br, "stderr")
// Test with tty.
cid, _ = dockerCmd(c, "run", "-dit", "busybox", "/bin/sh", "-c", "cat >&2")
cid = strings.TrimSpace(cid)
// Attach to stdout only.
conn, br, err = sockRequestHijack("POST", "/containers/"+cid+"/attach?stream=1&stdin=1&stdout=1", nil, "text/plain", daemonHost())
c.Assert(err, checker.IsNil)
expectSuccess(conn, br, "stdout", true)
// Attach without stdout stream.
conn, br, err = sockRequestHijack("POST", "/containers/"+cid+"/attach?stream=1&stdin=1&stderr=1", nil, "text/plain", daemonHost())
c.Assert(err, checker.IsNil)
// Nothing should be received because both the stdout and stderr of the container will be
// sent to the client as stdout when tty is enabled.
expectTimeout(conn, br, "stdout")
// Test the client API
client, err := client.NewEnvClient()
c.Assert(err, checker.IsNil)
defer client.Close()
cid, _ = dockerCmd(c, "run", "-di", "busybox", "/bin/sh", "-c", "echo hello; cat")
cid = strings.TrimSpace(cid)
// Make sure we don't see "hello" if Logs is false
attachOpts := types.ContainerAttachOptions{
Stream: true,
Stdin: true,
Stdout: true,
Stderr: true,
Logs: false,
}
resp, err := client.ContainerAttach(context.Background(), cid, attachOpts)
c.Assert(err, checker.IsNil)
expectSuccess(resp.Conn, resp.Reader, "stdout", false)
// Make sure we do see "hello" if Logs is true
attachOpts.Logs = true
resp, err = client.ContainerAttach(context.Background(), cid, attachOpts)
c.Assert(err, checker.IsNil)
defer resp.Conn.Close()
resp.Conn.SetReadDeadline(time.Now().Add(time.Second))
_, err = resp.Conn.Write([]byte("success"))
c.Assert(err, checker.IsNil)
var outBuf, errBuf bytes.Buffer
_, err = stdcopy.StdCopy(&outBuf, &errBuf, resp.Reader)
if err != nil && errors.Cause(err).(net.Error).Timeout() {
// ignore the timeout error as it is expected
err = nil
}
c.Assert(err, checker.IsNil)
c.Assert(errBuf.String(), checker.Equals, "")
c.Assert(outBuf.String(), checker.Equals, "hello\nsuccess")
}
// SockRequestHijack creates a connection to specified host (with method, contenttype, …) and returns a hijacked connection
// and the output as a `bufio.Reader`
func sockRequestHijack(method, endpoint string, data io.Reader, ct string, daemon string, modifiers ...func(*http.Request)) (net.Conn, *bufio.Reader, error) {
req, client, err := newRequestClient(method, endpoint, data, ct, daemon, modifiers...)
if err != nil {
return nil, nil, err
}
client.Do(req)
conn, br := client.Hijack()
return conn, br, nil
}
// FIXME(vdemeester) httputil.ClientConn is deprecated, use http.Client instead (closer to actual client)
// Deprecated: Use New instead of NewRequestClient
// Deprecated: use request.Do (or Get, Delete, Post) instead
func newRequestClient(method, endpoint string, data io.Reader, ct, daemon string, modifiers ...func(*http.Request)) (*http.Request, *httputil.ClientConn, error) {
c, err := request.SockConn(time.Duration(10*time.Second), daemon)
if err != nil {
return nil, nil, fmt.Errorf("could not dial docker daemon: %v", err)
}
client := httputil.NewClientConn(c, nil)
req, err := http.NewRequest(method, endpoint, data)
if err != nil {
client.Close()
return nil, nil, fmt.Errorf("could not create new request: %v", err)
}
for _, opt := range modifiers {
opt(req)
}
if ct != "" {
req.Header.Set("Content-Type", ct)
}
return req, client, nil
}