1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
package gitaly
import (
"context"
"strings"
"sync"
"github.com/golang/protobuf/jsonpb" //lint:ignore SA1019 https://gitlab.com/gitlab-org/gitlab/-/issues/324868
"github.com/golang/protobuf/proto" //lint:ignore SA1019 https://gitlab.com/gitlab-org/gitlab/-/issues/324868
grpc_middleware "github.com/grpc-ecosystem/go-grpc-middleware"
grpc_prometheus "github.com/grpc-ecosystem/go-grpc-prometheus"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
"github.com/sirupsen/logrus"
"google.golang.org/grpc"
"google.golang.org/grpc/metadata"
gitalyauth "gitlab.com/gitlab-org/gitaly/v16/auth"
gitalyclient "gitlab.com/gitlab-org/gitaly/v16/client"
"gitlab.com/gitlab-org/gitaly/v16/proto/go/gitalypb"
"gitlab.com/gitlab-org/gitlab/workhorse/internal/api"
grpccorrelation "gitlab.com/gitlab-org/labkit/correlation/grpc"
grpctracing "gitlab.com/gitlab-org/labkit/tracing/grpc"
)
type cacheKey struct {
address, token string
}
func getCacheKey(server api.GitalyServer) cacheKey {
return cacheKey{address: server.Address, token: server.Token}
}
type connectionsCache struct {
sync.RWMutex
connections map[cacheKey]*grpc.ClientConn
}
var (
jsonUnMarshaler = jsonpb.Unmarshaler{AllowUnknownFields: true}
// This connection cache map contains two types of connections:
// - Normal gRPC connections
// - Sidechannel connections. When client dials to the Gitaly server, the
// server multiplexes the connection using Yamux. In the future, the server
// can open another stream to transfer data without gRPC. Besides, we apply
// a framing protocol to add the half-close capability to Yamux streams.
// Hence, we cannot use those connections interchangeably.
cache = connectionsCache{
connections: make(map[cacheKey]*grpc.ClientConn),
}
sidechannelRegistry *gitalyclient.SidechannelRegistry
connectionsTotal = promauto.NewCounterVec(
prometheus.CounterOpts{
Name: "gitlab_workhorse_gitaly_connections_total",
Help: "Number of Gitaly connections that have been established",
},
[]string{"status"},
)
)
func InitializeSidechannelRegistry(logger *logrus.Logger) {
if sidechannelRegistry == nil {
sidechannelRegistry = gitalyclient.NewSidechannelRegistry(logrus.NewEntry(logger))
}
}
var allowedMetadataKeys = map[string]bool{
"user_id": true,
"username": true,
"remote_ip": true,
}
func withOutgoingMetadata(ctx context.Context, gs api.GitalyServer) context.Context {
md := metadata.New(nil)
for k, v := range gs.CallMetadata {
if strings.HasPrefix(k, "gitaly-feature-") || allowedMetadataKeys[k] {
md.Set(k, v)
}
}
return metadata.NewOutgoingContext(ctx, md)
}
func NewSmartHTTPClient(ctx context.Context, server api.GitalyServer) (context.Context, *SmartHTTPClient, error) {
conn, err := getOrCreateConnection(server)
if err != nil {
return nil, nil, err
}
grpcClient := gitalypb.NewSmartHTTPServiceClient(conn)
smartHTTPClient := &SmartHTTPClient{
SmartHTTPServiceClient: grpcClient,
sidechannelRegistry: sidechannelRegistry,
}
return withOutgoingMetadata(ctx, server), smartHTTPClient, nil
}
func NewBlobClient(ctx context.Context, server api.GitalyServer) (context.Context, *BlobClient, error) {
conn, err := getOrCreateConnection(server)
if err != nil {
return nil, nil, err
}
grpcClient := gitalypb.NewBlobServiceClient(conn)
return withOutgoingMetadata(ctx, server), &BlobClient{grpcClient}, nil
}
func NewRepositoryClient(ctx context.Context, server api.GitalyServer) (context.Context, *RepositoryClient, error) {
conn, err := getOrCreateConnection(server)
if err != nil {
return nil, nil, err
}
grpcClient := gitalypb.NewRepositoryServiceClient(conn)
return withOutgoingMetadata(ctx, server), &RepositoryClient{grpcClient}, nil
}
// NewNamespaceClient is only used by the Gitaly integration tests at present
func NewNamespaceClient(ctx context.Context, server api.GitalyServer) (context.Context, *NamespaceClient, error) {
conn, err := getOrCreateConnection(server)
if err != nil {
return nil, nil, err
}
grpcClient := gitalypb.NewNamespaceServiceClient(conn)
return withOutgoingMetadata(ctx, server), &NamespaceClient{grpcClient}, nil
}
func NewDiffClient(ctx context.Context, server api.GitalyServer) (context.Context, *DiffClient, error) {
conn, err := getOrCreateConnection(server)
if err != nil {
return nil, nil, err
}
grpcClient := gitalypb.NewDiffServiceClient(conn)
return withOutgoingMetadata(ctx, server), &DiffClient{grpcClient}, nil
}
func getOrCreateConnection(server api.GitalyServer) (*grpc.ClientConn, error) {
key := getCacheKey(server)
cache.RLock()
conn := cache.connections[key]
cache.RUnlock()
if conn != nil {
return conn, nil
}
cache.Lock()
defer cache.Unlock()
if conn := cache.connections[key]; conn != nil {
return conn, nil
}
conn, err := newConnection(server)
if err != nil {
return nil, err
}
cache.connections[key] = conn
return conn, nil
}
func CloseConnections() {
cache.Lock()
defer cache.Unlock()
for _, conn := range cache.connections {
conn.Close()
}
}
func newConnection(server api.GitalyServer) (*grpc.ClientConn, error) {
connOpts := append(gitalyclient.DefaultDialOpts,
grpc.WithPerRPCCredentials(gitalyauth.RPCCredentialsV2(server.Token)),
grpc.WithStreamInterceptor(
grpc_middleware.ChainStreamClient(
grpctracing.StreamClientTracingInterceptor(),
grpc_prometheus.StreamClientInterceptor,
grpccorrelation.StreamClientCorrelationInterceptor(
grpccorrelation.WithClientName("gitlab-workhorse"),
),
),
),
grpc.WithUnaryInterceptor(
grpc_middleware.ChainUnaryClient(
grpctracing.UnaryClientTracingInterceptor(),
grpc_prometheus.UnaryClientInterceptor,
grpccorrelation.UnaryClientCorrelationInterceptor(
grpccorrelation.WithClientName("gitlab-workhorse"),
),
),
),
// In https://gitlab.com/groups/gitlab-org/-/epics/8971, we added DNS discovery support to Praefect. This was
// done by making two changes:
// - Configure client-side round-robin load-balancing in client dial options. We added that as a default option
// inside gitaly client in gitaly client since v15.9.0
// - Configure DNS resolving. Due to some technical limitations, we don't use gRPC's built-in DNS resolver.
// Instead, we implement our own DNS resolver. This resolver is exposed via the following configuration.
// Afterward, workhorse can detect and handle DNS discovery automatically. The user needs to setup and set
// Gitaly address to something like "dns:gitaly.service.dc1.consul"
gitalyclient.WithGitalyDNSResolver(gitalyclient.DefaultDNSResolverBuilderConfig()),
)
conn, connErr := gitalyclient.DialSidechannel(context.Background(), server.Address, sidechannelRegistry, connOpts) // lint:allow context.Background
label := "ok"
if connErr != nil {
label = "fail"
}
connectionsTotal.WithLabelValues(label).Inc()
return conn, connErr
}
func UnmarshalJSON(s string, msg proto.Message) error {
return jsonUnMarshaler.Unmarshal(strings.NewReader(s), msg)
}
|