grpc-go/test/authority_test.go

/*
 *
 * Copyright 2020 gRPC authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

package test

import (
	"context"
	"fmt"
	"net"
	"os"
	"testing"
	"time"

	"google.golang.org/grpc"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/metadata"
	"google.golang.org/grpc/status"
	testpb "google.golang.org/grpc/test/grpc_testing"
)

func runUnixTest(t *testing.T, address, target, expectedAuthority string, dialer func(context.Context, string) (net.Conn, error)) {
	if err := os.RemoveAll(address); err != nil {
		t.Fatalf("Error removing socket file %v: %v\n", address, err)
	}
	us := &stubServer{
		emptyCall: func(ctx context.Context, in *testpb.Empty) (*testpb.Empty, error) {
			md, ok := metadata.FromIncomingContext(ctx)
			if !ok {
				return nil, status.Error(codes.InvalidArgument, "failed to parse metadata")
			}
			auths, ok := md[":authority"]
			if !ok {
				return nil, status.Error(codes.InvalidArgument, "no authority header")
			}
			if len(auths) < 1 {
				return nil, status.Error(codes.InvalidArgument, "no authority header")
			}
			if auths[0] != expectedAuthority {
				return nil, status.Error(codes.InvalidArgument, fmt.Sprintf("invalid authority header %v, expected %v", auths[0], expectedAuthority))
			}
			return &testpb.Empty{}, nil
		},
		network: "unix",
		address: address,
		target:  target,
	}
	opts := []grpc.DialOption{}
	if dialer != nil {
		opts = append(opts, grpc.WithContextDialer(dialer))
	}
	if err := us.Start(nil, opts...); err != nil {
		t.Fatalf("Error starting endpoint server: %v", err)
		return
	}
	defer us.Stop()
	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
	defer cancel()
	_, err := us.client.EmptyCall(ctx, &testpb.Empty{})
	if err != nil {
		t.Errorf("us.client.EmptyCall(_, _) = _, %v; want _, nil", err)
	}
}

// TestUnix does end to end tests with the various supported unix target
// formats, ensuring that the authority is set to localhost in every case.
func (s) TestUnix(t *testing.T) {
	tests := []struct {
		name      string
		address   string
		target    string
		authority string
	}{
		{
			name:      "UnixRelative",
			address:   "sock.sock",
			target:    "unix:sock.sock",
			authority: "localhost",
		},
		{
			name:      "UnixAbsolute",
			address:   "/tmp/sock.sock",
			target:    "unix:/tmp/sock.sock",
			authority: "localhost",
		},
		{
			name:      "UnixAbsoluteAlternate",
			address:   "/tmp/sock.sock",
			target:    "unix:///tmp/sock.sock",
			authority: "localhost",
		},
	}
	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			runUnixTest(t, test.address, test.target, test.authority, nil)
		})
	}
}

// TestUnixCustomDialer does end to end tests with various supported unix target
// formats, ensuring that the target sent to the dialer does NOT have the
// "unix:" prefix stripped.
func (s) TestUnixCustomDialer(t *testing.T) {
	tests := []struct {
		name      string
		address   string
		target    string
		authority string
	}{
		{
			name:      "UnixRelative",
			address:   "sock.sock",
			target:    "unix:sock.sock",
			authority: "localhost",
		},
		{
			name:      "UnixAbsolute",
			address:   "/tmp/sock.sock",
			target:    "unix:/tmp/sock.sock",
			authority: "localhost",
		},
	}
	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			dialer := func(ctx context.Context, address string) (net.Conn, error) {
				if address != test.target {
					return nil, fmt.Errorf("expected target %v in custom dialer, instead got %v", test.target, address)
				}
				address = address[len("unix:"):]
				return (&net.Dialer{}).DialContext(ctx, "unix", address)
			}
			runUnixTest(t, test.address, test.target, test.authority, dialer)
		})
	}
}