DockerCLI/vendor/github.com/moby/buildkit/session/grpchijack/hijack.go

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package grpchijack
import (
"net"
controlapi "github.com/moby/buildkit/api/services/control"
"google.golang.org/grpc/metadata"
)
// Hijack hijacks session to a connection.
func Hijack(stream controlapi.Control_SessionServer) (net.Conn, <-chan struct{}, map[string][]string) {
md, _ := metadata.FromIncomingContext(stream.Context())
c, closeCh := streamToConn(stream)
return c, closeCh, md
}