forked from moby/buildkit
-
Notifications
You must be signed in to change notification settings - Fork 3
/
client.go
209 lines (179 loc) · 6 KB
/
client.go
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
package client
import (
"context"
"crypto/tls"
"crypto/x509"
"io/ioutil"
"net"
"net/url"
"github.com/containerd/containerd/defaults"
grpc_middleware "github.com/grpc-ecosystem/go-grpc-middleware"
controlapi "github.com/moby/buildkit/api/services/control"
"github.com/moby/buildkit/client/connhelper"
"github.com/moby/buildkit/session"
"github.com/moby/buildkit/session/grpchijack"
"github.com/moby/buildkit/util/appdefaults"
"github.com/moby/buildkit/util/grpcerrors"
"github.com/pkg/errors"
"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"
"go.opentelemetry.io/otel/propagation"
"go.opentelemetry.io/otel/trace"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
)
type Client struct {
conn *grpc.ClientConn
}
type ClientOpt interface{}
// New returns a new buildkit client. Address can be empty for the system-default address.
func New(ctx context.Context, address string, opts ...ClientOpt) (*Client, error) {
gopts := []grpc.DialOption{
grpc.WithDefaultCallOptions(grpc.MaxCallRecvMsgSize(defaults.DefaultMaxRecvMsgSize)),
grpc.WithDefaultCallOptions(grpc.MaxCallSendMsgSize(defaults.DefaultMaxSendMsgSize)),
}
needDialer := true
needWithInsecure := true
var unary []grpc.UnaryClientInterceptor
var stream []grpc.StreamClientInterceptor
for _, o := range opts {
if _, ok := o.(*withFailFast); ok {
gopts = append(gopts, grpc.FailOnNonTempDialError(true))
}
if credInfo, ok := o.(*withCredentials); ok {
opt, err := loadCredentials(credInfo)
if err != nil {
return nil, err
}
gopts = append(gopts, opt)
needWithInsecure = false
}
if wt, ok := o.(*withTracer); ok {
var propagators = propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{})
unary = append(unary, otelgrpc.UnaryClientInterceptor(otelgrpc.WithTracerProvider(wt), otelgrpc.WithPropagators(propagators)))
stream = append(stream, otelgrpc.StreamClientInterceptor(otelgrpc.WithTracerProvider(wt), otelgrpc.WithPropagators(propagators)))
}
if wd, ok := o.(*withDialer); ok {
gopts = append(gopts, grpc.WithContextDialer(wd.dialer))
needDialer = false
}
}
if needDialer {
dialFn, err := resolveDialer(address)
if err != nil {
return nil, err
}
gopts = append(gopts, grpc.WithContextDialer(dialFn))
}
if needWithInsecure {
gopts = append(gopts, grpc.WithInsecure())
}
if address == "" {
address = appdefaults.Address
}
// grpc-go uses a slightly different naming scheme: https://github.com/grpc/grpc/blob/master/doc/naming.md
// This will end up setting rfc non-complient :authority header to address string (e.g. tcp://127.0.0.1:1234).
// So, here sets right authority header via WithAuthority DialOption.
addressURL, err := url.Parse(address)
if err != nil {
return nil, err
}
gopts = append(gopts, grpc.WithAuthority(addressURL.Host))
unary = append(unary, grpcerrors.UnaryClientInterceptor)
stream = append(stream, grpcerrors.StreamClientInterceptor)
if len(unary) == 1 {
gopts = append(gopts, grpc.WithUnaryInterceptor(unary[0]))
} else if len(unary) > 1 {
gopts = append(gopts, grpc.WithUnaryInterceptor(grpc_middleware.ChainUnaryClient(unary...)))
}
if len(stream) == 1 {
gopts = append(gopts, grpc.WithStreamInterceptor(stream[0]))
} else if len(stream) > 1 {
gopts = append(gopts, grpc.WithStreamInterceptor(grpc_middleware.ChainStreamClient(stream...)))
}
conn, err := grpc.DialContext(ctx, address, gopts...)
if err != nil {
return nil, errors.Wrapf(err, "failed to dial %q . make sure buildkitd is running", address)
}
c := &Client{
conn: conn,
}
return c, nil
}
func (c *Client) controlClient() controlapi.ControlClient {
return controlapi.NewControlClient(c.conn)
}
func (c *Client) Dialer() session.Dialer {
return grpchijack.Dialer(c.controlClient())
}
func (c *Client) Close() error {
return c.conn.Close()
}
type withFailFast struct{}
func WithFailFast() ClientOpt {
return &withFailFast{}
}
type withDialer struct {
dialer func(context.Context, string) (net.Conn, error)
}
func WithContextDialer(df func(context.Context, string) (net.Conn, error)) ClientOpt {
return &withDialer{dialer: df}
}
type withCredentials struct {
ServerName string
CACert string
Cert string
Key string
}
// WithCredentials configures the TLS parameters of the client.
// Arguments:
// * serverName: specifies the name of the target server
// * ca: specifies the filepath of the CA certificate to use for verification
// * cert: specifies the filepath of the client certificate
// * key: specifies the filepath of the client key
func WithCredentials(serverName, ca, cert, key string) ClientOpt {
return &withCredentials{serverName, ca, cert, key}
}
func loadCredentials(opts *withCredentials) (grpc.DialOption, error) {
ca, err := ioutil.ReadFile(opts.CACert)
if err != nil {
return nil, errors.Wrap(err, "could not read ca certificate")
}
certPool := x509.NewCertPool()
if ok := certPool.AppendCertsFromPEM(ca); !ok {
return nil, errors.New("failed to append ca certs")
}
cfg := &tls.Config{
ServerName: opts.ServerName,
RootCAs: certPool,
}
// we will produce an error if the user forgot about either cert or key if at least one is specified
if opts.Cert != "" || opts.Key != "" {
cert, err := tls.LoadX509KeyPair(opts.Cert, opts.Key)
if err != nil {
return nil, errors.Wrap(err, "could not read certificate/key")
}
cfg.Certificates = []tls.Certificate{cert}
cfg.BuildNameToCertificate()
}
return grpc.WithTransportCredentials(credentials.NewTLS(cfg)), nil
}
func WithTracer(t trace.Tracer) ClientOpt {
return &withTracer{t}
}
type withTracer struct {
tracer trace.Tracer
}
func (wt *withTracer) Tracer(instrumentationName string, opts ...trace.TracerOption) trace.Tracer {
return wt.tracer
}
func resolveDialer(address string) (func(context.Context, string) (net.Conn, error), error) {
ch, err := connhelper.GetConnectionHelper(address)
if err != nil {
return nil, err
}
if ch != nil {
return ch.ContextDialer, nil
}
// basic dialer
return dialer, nil
}