1// +build go1.6,!go1.7
2
3/*
4 *
5 * Copyright 2016 gRPC authors.
6 *
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
10 *
11 *     http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 *
19 */
20
21package grpc
22
23import (
24	"fmt"
25	"io"
26	"net"
27	"net/http"
28
29	"golang.org/x/net/context"
30	"google.golang.org/grpc/codes"
31	"google.golang.org/grpc/status"
32	"google.golang.org/grpc/transport"
33)
34
35// dialContext connects to the address on the named network.
36func dialContext(ctx context.Context, network, address string) (net.Conn, error) {
37	return (&net.Dialer{Cancel: ctx.Done()}).Dial(network, address)
38}
39
40func sendHTTPRequest(ctx context.Context, req *http.Request, conn net.Conn) error {
41	req.Cancel = ctx.Done()
42	if err := req.Write(conn); err != nil {
43		return fmt.Errorf("failed to write the HTTP request: %v", err)
44	}
45	return nil
46}
47
48// toRPCErr converts an error into an error from the status package.
49func toRPCErr(err error) error {
50	if err == nil || err == io.EOF {
51		return err
52	}
53	if _, ok := status.FromError(err); ok {
54		return err
55	}
56	switch e := err.(type) {
57	case transport.StreamError:
58		return status.Error(e.Code, e.Desc)
59	case transport.ConnectionError:
60		return status.Error(codes.Unavailable, e.Desc)
61	default:
62		switch err {
63		case context.DeadlineExceeded:
64			return status.Error(codes.DeadlineExceeded, err.Error())
65		case context.Canceled:
66			return status.Error(codes.Canceled, err.Error())
67		}
68	}
69	return status.Error(codes.Unknown, err.Error())
70}
71