141 lines
4.3 KiB
Go
141 lines
4.3 KiB
Go
package client // import "github.com/docker/docker/client"
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import (
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"bufio"
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"context"
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"fmt"
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"net"
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"net/http"
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"net/url"
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"time"
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"github.com/docker/docker/api/types"
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"github.com/docker/docker/api/types/versions"
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"github.com/pkg/errors"
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"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
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)
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// postHijacked sends a POST request and hijacks the connection.
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func (cli *Client) postHijacked(ctx context.Context, path string, query url.Values, body interface{}, headers map[string][]string) (types.HijackedResponse, error) {
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bodyEncoded, err := encodeData(body)
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if err != nil {
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return types.HijackedResponse{}, err
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}
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req, err := cli.buildRequest(ctx, http.MethodPost, cli.getAPIPath(ctx, path, query), bodyEncoded, headers)
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if err != nil {
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return types.HijackedResponse{}, err
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}
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conn, mediaType, err := cli.setupHijackConn(req, "tcp")
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if err != nil {
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return types.HijackedResponse{}, err
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}
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return types.NewHijackedResponse(conn, mediaType), err
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}
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// DialHijack returns a hijacked connection with negotiated protocol proto.
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func (cli *Client) DialHijack(ctx context.Context, url, proto string, meta map[string][]string) (net.Conn, error) {
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req, err := http.NewRequestWithContext(ctx, http.MethodPost, url, nil)
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if err != nil {
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return nil, err
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}
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req = cli.addHeaders(req, meta)
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conn, _, err := cli.setupHijackConn(req, proto)
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return conn, err
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}
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func (cli *Client) setupHijackConn(req *http.Request, proto string) (_ net.Conn, _ string, retErr error) {
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ctx := req.Context()
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req.Header.Set("Connection", "Upgrade")
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req.Header.Set("Upgrade", proto)
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dialer := cli.Dialer()
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conn, err := dialer(ctx)
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if err != nil {
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return nil, "", errors.Wrap(err, "cannot connect to the Docker daemon. Is 'docker daemon' running on this host?")
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}
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defer func() {
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if retErr != nil {
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conn.Close()
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}
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}()
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// When we set up a TCP connection for hijack, there could be long periods
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// of inactivity (a long running command with no output) that in certain
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// network setups may cause ECONNTIMEOUT, leaving the client in an unknown
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// state. Setting TCP KeepAlive on the socket connection will prohibit
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// ECONNTIMEOUT unless the socket connection truly is broken
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if tcpConn, ok := conn.(*net.TCPConn); ok {
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_ = tcpConn.SetKeepAlive(true)
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_ = tcpConn.SetKeepAlivePeriod(30 * time.Second)
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}
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hc := &hijackedConn{conn, bufio.NewReader(conn)}
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// Server hijacks the connection, error 'connection closed' expected
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resp, err := otelhttp.NewTransport(hc).RoundTrip(req)
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if err != nil {
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return nil, "", err
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}
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if resp.StatusCode != http.StatusSwitchingProtocols {
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_ = resp.Body.Close()
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return nil, "", fmt.Errorf("unable to upgrade to %s, received %d", proto, resp.StatusCode)
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}
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if hc.r.Buffered() > 0 {
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// If there is buffered content, wrap the connection. We return an
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// object that implements CloseWrite if the underlying connection
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// implements it.
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if _, ok := hc.Conn.(types.CloseWriter); ok {
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conn = &hijackedConnCloseWriter{hc}
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} else {
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conn = hc
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}
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} else {
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hc.r.Reset(nil)
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}
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var mediaType string
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if versions.GreaterThanOrEqualTo(cli.ClientVersion(), "1.42") {
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// Prior to 1.42, Content-Type is always set to raw-stream and not relevant
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mediaType = resp.Header.Get("Content-Type")
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}
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return conn, mediaType, nil
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}
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// hijackedConn wraps a net.Conn and is returned by setupHijackConn in the case
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// that a) there was already buffered data in the http layer when Hijack() was
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// called, and b) the underlying net.Conn does *not* implement CloseWrite().
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// hijackedConn does not implement CloseWrite() either.
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type hijackedConn struct {
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net.Conn
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r *bufio.Reader
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}
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func (c *hijackedConn) RoundTrip(req *http.Request) (*http.Response, error) {
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if err := req.Write(c.Conn); err != nil {
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return nil, err
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}
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return http.ReadResponse(c.r, req)
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}
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func (c *hijackedConn) Read(b []byte) (int, error) {
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return c.r.Read(b)
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}
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// hijackedConnCloseWriter is a hijackedConn which additionally implements
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// CloseWrite(). It is returned by setupHijackConn in the case that a) there
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// was already buffered data in the http layer when Hijack() was called, and b)
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// the underlying net.Conn *does* implement CloseWrite().
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type hijackedConnCloseWriter struct {
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*hijackedConn
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}
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var _ types.CloseWriter = &hijackedConnCloseWriter{}
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func (c *hijackedConnCloseWriter) CloseWrite() error {
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conn := c.Conn.(types.CloseWriter)
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return conn.CloseWrite()
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}
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