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package grpc // import "github.com/docker/docker/api/server/router/grpc"
import (
"context"
"net/http"
"github.com/pkg/errors"
"golang.org/x/net/http2"
)
func (gr *grpcRouter) serveGRPC(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
h, ok := w.(http.Hijacker)
if !ok {
return errors.New("handler does not support hijack")
}
proto := r.Header.Get("Upgrade")
if proto == "" {
return errors.New("no upgrade proto in request")
}
if proto != "h2c" {
return errors.Errorf("protocol %s not supported", proto)
}
conn, _, err := h.Hijack()
if err != nil {
return err
}
resp := &http.Response{
StatusCode: http.StatusSwitchingProtocols,
ProtoMajor: 1,
ProtoMinor: 1,
Header: http.Header{},
}
resp.Header.Set("Connection", "Upgrade")
resp.Header.Set("Upgrade", proto)
// set raw mode
conn.Write([]byte{})
resp.Write(conn)
// https://godoc.org/golang.org/x/net/http2#Server.ServeConn
// TODO: is it a problem that conn has already been written to?
gr.h2Server.ServeConn(conn, &http2.ServeConnOpts{Handler: gr.grpcServer})
return nil
}
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