V2 Update attach bindings to use Readers/Writers vs chan

* Change function call to use readers/writers in place channels
* Support stdin for pushing data from client to container
* Add bindings test

Signed-off-by: Jhon Honce <jhonce@redhat.com>

pkg/bindings/connection.go

@@ -39,6 +39,7 @@ type APIResponse struct {
 type Connection struct {
 	_url   *url.URL
 	client *http.Client
+	conn   *net.Conn
 }
 
 type valueKey string
@@ -88,26 +89,26 @@ func NewConnection(ctx context.Context, uri string, identity ...string) (context
 	}
 
 	// Now we setup the http client to use the connection above
-	var client *http.Client
+	var connection Connection
 	switch _url.Scheme {
 	case "ssh":
 		secure, err = strconv.ParseBool(_url.Query().Get("secure"))
 		if err != nil {
 			secure = false
 		}
-		client, err = sshClient(_url, identity[0], secure)
+		connection, err = sshClient(_url, identity[0], secure)
 	case "unix":
 		if !strings.HasPrefix(uri, "unix:///") {
 			// autofix unix://path_element vs unix:///path_element
 			_url.Path = JoinURL(_url.Host, _url.Path)
 			_url.Host = ""
 		}
-		client, err = unixClient(_url)
+		connection, err = unixClient(_url)
 	case "tcp":
 		if !strings.HasPrefix(uri, "tcp://") {
 			return nil, errors.New("tcp URIs should begin with tcp://")
 		}
-		client, err = tcpClient(_url)
+		connection, err = tcpClient(_url)
 	default:
 		return nil, errors.Errorf("'%s' is not a supported schema", _url.Scheme)
 	}
@@ -115,22 +116,30 @@ func NewConnection(ctx context.Context, uri string, identity ...string) (context
 		return nil, errors.Wrapf(err, "Failed to create %sClient", _url.Scheme)
 	}
 
-	ctx = context.WithValue(ctx, clientKey, &Connection{_url, client})
+	ctx = context.WithValue(ctx, clientKey, &connection)
 	if err := pingNewConnection(ctx); err != nil {
 		return nil, err
 	}
 	return ctx, nil
 }
 
-func tcpClient(_url *url.URL) (*http.Client, error) {
-	return &http.Client{
+func tcpClient(_url *url.URL) (Connection, error) {
+	connection := Connection{
+		_url: _url,
+	}
+	connection.client = &http.Client{
 		Transport: &http.Transport{
-			DialContext: func(_ context.Context, _, _ string) (net.Conn, error) {
-				return net.Dial("tcp", _url.Host)
+			DialContext: func(ctx context.Context, _, _ string) (net.Conn, error) {
+				conn, err := net.Dial("tcp", _url.Host)
+				if c, ok := ctx.Value(clientKey).(*Connection); ok {
+					c.conn = &conn
+				}
+				return conn, err
 			},
 			DisableCompression: true,
 		},
-	}, nil
+	}
+	return connection, nil
 }
 
 // pingNewConnection pings to make sure the RESTFUL service is up
@@ -151,10 +160,10 @@ func pingNewConnection(ctx context.Context) error {
 	return errors.Errorf("ping response was %q", response.StatusCode)
 }
 
-func sshClient(_url *url.URL, identity string, secure bool) (*http.Client, error) {
+func sshClient(_url *url.URL, identity string, secure bool) (Connection, error) {
 	auth, err := publicKey(identity)
 	if err != nil {
-		return nil, errors.Wrapf(err, "Failed to parse identity %s: %v\n", _url.String(), identity)
+		return Connection{}, errors.Wrapf(err, "Failed to parse identity %s: %v\n", _url.String(), identity)
 	}
 
 	callback := ssh.InsecureIgnoreHostKey()
@@ -188,26 +197,39 @@ func sshClient(_url *url.URL, identity string, secure bool) (*http.Client, error
 		},
 	)
 	if err != nil {
-		return nil, errors.Wrapf(err, "Connection to bastion host (%s) failed.", _url.String())
-	}
-	return &http.Client{
-		Transport: &http.Transport{
-			DialContext: func(_ context.Context, _, _ string) (net.Conn, error) {
-				return bastion.Dial("unix", _url.Path)
-			},
-		}}, nil
+		return Connection{}, errors.Wrapf(err, "Connection to bastion host (%s) failed.", _url.String())
 	}
 
-func unixClient(_url *url.URL) (*http.Client, error) {
-	return &http.Client{
+	connection := Connection{_url: _url}
+	connection.client = &http.Client{
+		Transport: &http.Transport{
+			DialContext: func(ctx context.Context, _, _ string) (net.Conn, error) {
+				conn, err := bastion.Dial("unix", _url.Path)
+				if c, ok := ctx.Value(clientKey).(*Connection); ok {
+					c.conn = &conn
+				}
+				return conn, err
+			},
+		}}
+	return connection, nil
+}
+
+func unixClient(_url *url.URL) (Connection, error) {
+	connection := Connection{_url: _url}
+	connection.client = &http.Client{
 		Transport: &http.Transport{
 			DialContext: func(ctx context.Context, _, _ string) (net.Conn, error) {
 				d := net.Dialer{}
-				return d.DialContext(ctx, "unix", _url.Path)
+				conn, err := d.DialContext(ctx, "unix", _url.Path)
+				if c, ok := ctx.Value(clientKey).(*Connection); ok {
+					c.conn = &conn
+				}
+				return conn, err
 			},
 			DisableCompression: true,
 		},
-	}, nil
+	}
+	return connection, nil
 }
 
 // DoRequest assembles the http request and returns the response
@@ -232,6 +254,7 @@ func (c *Connection) DoRequest(httpBody io.Reader, httpMethod, endpoint string,
 	if len(queryParams) > 0 {
 		req.URL.RawQuery = queryParams.Encode()
 	}
+	req = req.WithContext(context.WithValue(context.Background(), clientKey, c))
 	// Give the Do three chances in the case of a comm/service hiccup
 	for i := 0; i < 3; i++ {
 		response, err = c.client.Do(req) // nolint
@@ -243,6 +266,10 @@ func (c *Connection) DoRequest(httpBody io.Reader, httpMethod, endpoint string,
 	return &APIResponse{response, req}, err
 }
 
+func (c *Connection) Write(b []byte) (int, error) {
+	return (*c.conn).Write(b)
+}
+
 // FiltersToString converts our typical filter format of a
 // map[string][]string to a query/html safe string.
 func FiltersToString(filters map[string][]string) (string, error) {
@@ -295,8 +322,8 @@ func publicKey(path string) (ssh.AuthMethod, error) {
 func hostKey(host string) ssh.PublicKey {
 	// parse OpenSSH known_hosts file
 	// ssh or use ssh-keyscan to get initial key
-	known_hosts := filepath.Join(homedir.HomeDir(), ".ssh", "known_hosts")
-	fd, err := os.Open(known_hosts)
+	knownHosts := filepath.Join(homedir.HomeDir(), ".ssh", "known_hosts")
+	fd, err := os.Open(knownHosts)
 	if err != nil {
 		logrus.Error(err)
 		return nil

pkg/bindings/containers/containers.go

@@ -15,6 +15,7 @@ import (
 	"github.com/containers/libpod/pkg/bindings"
 	"github.com/containers/libpod/pkg/domain/entities"
 	"github.com/pkg/errors"
+	"github.com/sirupsen/logrus"
 )
 
 var (
@@ -341,12 +342,18 @@ func ContainerInit(ctx context.Context, nameOrID string) error {
 }
 
 // Attach attaches to a running container
-func Attach(ctx context.Context, nameOrId string, detachKeys *string, logs, stream *bool, stdin *bool, stdout io.Writer, stderr io.Writer) error {
+func Attach(ctx context.Context, nameOrId string, detachKeys *string, logs, stream *bool, stdin io.Reader, stdout io.Writer, stderr io.Writer) error {
 	conn, err := bindings.GetClient(ctx)
 	if err != nil {
 		return err
 	}
 
+	// Do we need to wire in stdin?
+	ctnr, err := Inspect(ctx, nameOrId, &bindings.PFalse)
+	if err != nil {
+		return err
+	}
+
 	params := url.Values{}
 	if detachKeys != nil {
 		params.Add("detachKeys", *detachKeys)
@@ -357,7 +364,7 @@ func Attach(ctx context.Context, nameOrId string, detachKeys *string, logs, stre
 	if stream != nil {
 		params.Add("stream", fmt.Sprintf("%t", *stream))
 	}
-	if stdin != nil && *stdin {
+	if stdin != nil {
 		params.Add("stdin", "true")
 	}
 	if stdout != nil {
@@ -373,11 +380,23 @@ func Attach(ctx context.Context, nameOrId string, detachKeys *string, logs, stre
 	}
 	defer response.Body.Close()
 
-	ctype := response.Header.Get("Content-Type")
-	upgrade := response.Header.Get("Connection")
+	if stdin != nil {
+		go func() {
+			_, err := io.Copy(conn, stdin)
+			if err != nil {
+				logrus.Error("failed to write input to service: " + err.Error())
+			}
+		}()
+	}
 
 	buffer := make([]byte, 1024)
-	if ctype == "application/vnd.docker.raw-stream" && upgrade == "Upgrade" {
+	if ctnr.Config.Tty {
+		// If not multiplex'ed, read from server and write to stdout
+		_, err := io.Copy(stdout, response.Body)
+		if err != nil {
+			return err
+		}
+	} else {
 		for {
 			// Read multiplexed channels and write to appropriate stream
 			fd, l, err := DemuxHeader(response.Body, buffer)
@@ -396,30 +415,27 @@ func Attach(ctx context.Context, nameOrId string, detachKeys *string, logs, stre
 			}
 
 			switch {
-			case fd == 0 && stdin != nil && *stdin:
-				stdout.Write(frame)
+			case fd == 0 && stdin != nil:
+				_, err := stdout.Write(frame[0:l])
+				if err != nil {
+					return err
+				}
 			case fd == 1 && stdout != nil:
-				stdout.Write(frame)
+				_, err := stdout.Write(frame[0:l])
+				if err != nil {
+					return err
+				}
 			case fd == 2 && stderr != nil:
-				stderr.Write(frame)
+				_, err := stderr.Write(frame[0:l])
+				if err != nil {
+					return err
+				}
 			case fd == 3:
 				return fmt.Errorf("error from daemon in stream: %s", frame)
 			default:
 				return fmt.Errorf("unrecognized input header: %d", fd)
 			}
 		}
-	} else {
-		// If not multiplex'ed from server just dump stream to stdout
-		for {
-			_, err := response.Body.Read(buffer)
-			if err != nil {
-				if !errors.Is(err, io.EOF) {
-					return err
-				}
-				break
-			}
-			stdout.Write(buffer)
-		}
 	}
 	return err
 }

pkg/bindings/test/attach_test.go

@@ -2,10 +2,13 @@ package test_bindings
 
 import (
 	"bytes"
+	"fmt"
 	"time"
 
+	"github.com/containers/libpod/libpod/define"
 	"github.com/containers/libpod/pkg/bindings"
 	"github.com/containers/libpod/pkg/bindings/containers"
+	"github.com/containers/libpod/pkg/specgen"
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 	"github.com/onsi/gomega/gexec"
@@ -31,7 +34,7 @@ var _ = Describe("Podman containers attach", func() {
 		bt.cleanup()
 	})
 
-	It("attach", func() {
+	It("can run top in container", func() {
 		name := "TopAttachTest"
 		id, err := bt.RunTopContainer(&name, nil, nil)
 		Expect(err).ShouldNot(HaveOccurred())
@@ -51,13 +54,56 @@ var _ = Describe("Podman containers attach", func() {
 		go func() {
 			defer GinkgoRecover()
 
-			err := containers.Attach(bt.conn, id, nil, &bindings.PTrue, &bindings.PTrue, &bindings.PTrue, stdout, stderr)
+			err := containers.Attach(bt.conn, id, nil, &bindings.PTrue, &bindings.PTrue, nil, stdout, stderr)
 			Expect(err).ShouldNot(HaveOccurred())
 		}()
 
 		time.Sleep(5 * time.Second)
-
 		// First character/First line of top output
 		Expect(stdout.String()).Should(ContainSubstring("Mem: "))
 	})
+
+	It("can echo data via cat in container", func() {
+		s := specgen.NewSpecGenerator(alpine.name, false)
+		s.Name = "CatAttachTest"
+		s.Terminal = true
+		s.Command = []string{"/bin/cat"}
+		ctnr, err := containers.CreateWithSpec(bt.conn, s)
+		Expect(err).ShouldNot(HaveOccurred())
+
+		err = containers.Start(bt.conn, ctnr.ID, nil)
+		Expect(err).ShouldNot(HaveOccurred())
+
+		wait := define.ContainerStateRunning
+		_, err = containers.Wait(bt.conn, ctnr.ID, &wait)
+		Expect(err).ShouldNot(HaveOccurred())
+
+		tickTock := time.NewTimer(2 * time.Second)
+		go func() {
+			<-tickTock.C
+			timeout := uint(5)
+			err := containers.Stop(bt.conn, ctnr.ID, &timeout)
+			if err != nil {
+				GinkgoWriter.Write([]byte(err.Error()))
+			}
+		}()
+
+		msg := "Hello, World"
+		stdin := &bytes.Buffer{}
+		stdin.WriteString(msg + "\n")
+
+		stdout := &bytes.Buffer{}
+		stderr := &bytes.Buffer{}
+		go func() {
+			defer GinkgoRecover()
+
+			err := containers.Attach(bt.conn, ctnr.ID, nil, &bindings.PFalse, &bindings.PTrue, stdin, stdout, stderr)
+			Expect(err).ShouldNot(HaveOccurred())
+		}()
+
+		time.Sleep(5 * time.Second)
+		// Tty==true so we get echo'ed stdin + expected output
+		Expect(stdout.String()).Should(Equal(fmt.Sprintf("%[1]s\r\n%[1]s\r\n", msg)))
+		Expect(stderr.String()).Should(BeEmpty())
+	})
 })