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package codespaces
import (
"context"
"errors"
"fmt"
"net"
"time"
"github.com/cenkalti/backoff/v4"
"github.com/cli/cli/v2/internal/codespaces/api"
"github.com/cli/cli/v2/pkg/liveshare"
)
func connectionReady(codespace *api.Codespace) bool {
return codespace.Connection.SessionID != "" &&
codespace.Connection.SessionToken != "" &&
codespace.Connection.RelayEndpoint != "" &&
codespace.Connection.RelaySAS != "" &&
codespace.State == api.CodespaceStateAvailable
}
type apiClient interface {
GetCodespace(ctx context.Context, name string, includeConnection bool) (*api.Codespace, error)
StartCodespace(ctx context.Context, name string) error
}
type progressIndicator interface {
StartProgressIndicatorWithLabel(s string)
StopProgressIndicator()
}
type logger interface {
Println(v ...interface{})
Printf(f string, v ...interface{})
}
// ConnectToLiveshare waits for a Codespace to become running,
// and connects to it using a Live Share session.
func ConnectToLiveshare(ctx context.Context, progress progressIndicator, sessionLogger logger, apiClient apiClient, codespace *api.Codespace) (sess *liveshare.Session, err error) {
if codespace.State != api.CodespaceStateAvailable {
progress.StartProgressIndicatorWithLabel("Starting codespace")
defer progress.StopProgressIndicator()
if err := apiClient.StartCodespace(ctx, codespace.Name); err != nil {
return nil, fmt.Errorf("error starting codespace: %w", err)
}
}
expBackoff := backoff.NewExponentialBackOff()
expBackoff.Multiplier = 1.1
expBackoff.MaxInterval = 10 * time.Second
expBackoff.MaxElapsedTime = 5 * time.Minute
for retries := 0; !connectionReady(codespace); retries++ {
if retries > 1 {
duration := expBackoff.NextBackOff()
time.Sleep(duration)
}
if expBackoff.GetElapsedTime() >= expBackoff.MaxElapsedTime {
return nil, errors.New("timed out while waiting for the codespace to start")
}
codespace, err = apiClient.GetCodespace(ctx, codespace.Name, true)
if err != nil {
return nil, fmt.Errorf("error getting codespace: %w", err)
}
}
progress.StartProgressIndicatorWithLabel("Connecting to codespace")
defer progress.StopProgressIndicator()
return liveshare.Connect(ctx, liveshare.Options{
SessionID: codespace.Connection.SessionID,
SessionToken: codespace.Connection.SessionToken,
RelaySAS: codespace.Connection.RelaySAS,
RelayEndpoint: codespace.Connection.RelayEndpoint,
HostPublicKeys: codespace.Connection.HostPublicKeys,
Logger: sessionLogger,
})
}
// ListenTCP starts a localhost tcp listener and returns the listener and bound port
func ListenTCP(port int) (*net.TCPListener, int, error) {
addr, err := net.ResolveTCPAddr("tcp", fmt.Sprintf("127.0.0.1:%d", port))
if err != nil {
return nil, 0, fmt.Errorf("failed to build tcp address: %w", err)
}
listener, err := net.ListenTCP("tcp", addr)
if err != nil {
return nil, 0, fmt.Errorf("failed to listen to local port over tcp: %w", err)
}
port = listener.Addr().(*net.TCPAddr).Port
return listener, port, nil
}
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