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client_shell.go
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/
client_shell.go
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package rest
import (
"bytes"
"context"
"encoding/binary"
"encoding/json"
"errors"
"fmt"
"io"
"net/url"
"sync"
"github.com/gorilla/websocket"
"k8s.io/client-go/tools/remotecommand"
mtypes "github.com/akash-network/akash-api/go/node/market/v1beta3"
"github.com/akash-network/node/util/wsutil"
)
var (
errLeaseShell = errors.New("lease shell failed")
ErrLeaseShellProviderError = fmt.Errorf("%w: the provider encountered an unknown error", errLeaseShell)
)
func (c *client) LeaseShell(ctx context.Context, lID mtypes.LeaseID, service string, podIndex uint, cmd []string,
stdin io.ReadCloser,
stdout io.Writer,
stderr io.Writer,
tty bool,
terminalResize <-chan remotecommand.TerminalSize) error {
endpoint, err := url.Parse(c.host.String() + "/" + leaseShellPath(lID))
if err != nil {
return err
}
switch endpoint.Scheme {
case schemeWSS, schemeHTTPS:
endpoint.Scheme = schemeWSS
default:
return fmt.Errorf("%w: invalid uri scheme %q", errLeaseShell, endpoint.Scheme)
}
query := url.Values{}
query.Set("service", service)
query.Set("podIndex", fmt.Sprintf("%d", podIndex))
ttyValue := "0"
if tty {
ttyValue = "1"
}
query.Set("tty", ttyValue)
stdinValue := "0"
if stdin != nil {
stdinValue = "1"
}
query.Set("stdin", stdinValue)
for i, v := range cmd {
query.Set(fmt.Sprintf("cmd%d", i), v)
}
endpoint.RawQuery = query.Encode()
subctx, subcancel := context.WithCancel(ctx)
conn, response, err := c.wsclient.DialContext(subctx, endpoint.String(), nil)
if err != nil {
if errors.Is(err, websocket.ErrBadHandshake) {
buf := &bytes.Buffer{}
_, _ = io.Copy(buf, response.Body)
subcancel()
return ClientResponseError{
Status: response.StatusCode,
Message: buf.String(),
}
}
subcancel()
return err
}
wg := &sync.WaitGroup{}
suberr := make(chan error, 1)
saveError := func(msg string, err error) {
err = fmt.Errorf("%w: failed while %s", err, msg)
// The channel is buffered but do not block here
select {
case suberr <- err:
default:
}
}
wg.Add(1)
go func() {
defer wg.Done()
<-subctx.Done()
err := conn.Close()
if err != nil {
saveError("closing websocket", err)
}
}()
l := &sync.Mutex{}
if stdin != nil {
stdinWriter := wsutil.NewWsWriterWrapper(conn, LeaseShellCodeStdin, l)
// This goroutine is orphaned. There is no universal way to cancel a read from stdin
// at this time
go handleStdin(subctx, stdin, stdinWriter, saveError)
}
if tty && terminalResize != nil {
wg.Add(1)
terminalOutput := wsutil.NewWsWriterWrapper(conn, LeaseShellCodeTerminalResize, l)
go handleTerminalResize(subctx, wg, terminalResize, terminalOutput, saveError)
}
var remoteErrorData *bytes.Buffer
var connectionError error
loop:
for {
messageType, data, err := conn.ReadMessage()
if err != nil {
saveError("receiving from websocket", err)
break
}
if messageType != websocket.BinaryMessage {
continue // Just ignore anything else
}
if len(data) == 0 {
connectionError = fmt.Errorf("%w: provider sent a message that is too short to parse", errLeaseShell)
}
msgID := data[0] // First byte is always message ID
msg := data[1:] // remainder is the message
switch msgID {
case LeaseShellCodeStdout:
_, connectionError = stdout.Write(msg)
case LeaseShellCodeStderr:
_, connectionError = stderr.Write(msg)
case LeaseShellCodeResult:
remoteErrorData = bytes.NewBuffer(msg)
break loop
case LeaseShellCodeFailure:
connectionError = ErrLeaseShellProviderError
default:
connectionError = fmt.Errorf("%w: provider sent unknown message ID %d", errLeaseShell, messageType)
}
if connectionError != nil {
break loop
}
}
subcancel()
if stdin != nil {
err := stdin.Close()
if err != nil {
saveError("closing stdin", err)
}
}
// Check to see if the remote end returned an error
if remoteErrorData != nil {
if err = processRemoteError(remoteErrorData); err != nil {
return err
}
}
// Check to see if a goroutine failed
select {
case err = <-suberr:
return err
default:
}
wg.Wait()
return connectionError
}
func processRemoteError(input io.Reader) error {
dec := json.NewDecoder(input)
var v leaseShellResponse
err := dec.Decode(&v)
if err != nil {
return fmt.Errorf("%w: failed parsing response data from provider", err)
}
if 0 != len(v.Message) {
return fmt.Errorf("%w: %s", errLeaseShell, v.Message)
}
if 0 != v.ExitCode {
return fmt.Errorf("%w: remote process exited with code %d", errLeaseShell, v.ExitCode)
}
return nil
}
func handleStdin(ctx context.Context, input io.Reader, output io.Writer, saveError func(string, error)) {
data := make([]byte, 4096)
for {
n, err := input.Read(data)
if err != nil {
saveError("reading from stdin", err)
return
}
select {
case <-ctx.Done():
return
default:
}
_, err = output.Write(data[0:n])
if err != nil {
saveError("writing stdin data to remote", err)
return
}
}
}
func handleTerminalResize(ctx context.Context, wg *sync.WaitGroup, input <-chan remotecommand.TerminalSize, output io.Writer, saveError func(string, error)) {
defer wg.Done()
buf := &bytes.Buffer{}
for {
var size remotecommand.TerminalSize
var ok bool
select {
case <-ctx.Done():
return
case size, ok = <-input:
if !ok { // Channel has closed
return
}
}
// Clear the buffer, then pack in both values
buf.Reset()
err := binary.Write(buf, binary.BigEndian, size.Width)
if err != nil {
saveError("encoding terminal size width", err)
return
}
err = binary.Write(buf, binary.BigEndian, size.Height)
if err != nil {
saveError("encoding terminal size height", err)
return
}
_, err = output.Write((buf).Bytes())
if err != nil {
saveError("sending terminal size to remote", err)
return
}
}
}