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client.go
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client.go
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package client
import (
"context"
"crypto/tls"
"crypto/x509"
"io/ioutil"
"net"
"time"
"github.com/grpc-ecosystem/grpc-opentracing/go/otgrpc"
controlapi "github.com/moby/buildkit/api/services/control"
"github.com/moby/buildkit/client/connhelper"
"github.com/moby/buildkit/util/appdefaults"
opentracing "github.com/opentracing/opentracing-go"
"github.com/pkg/errors"
"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{}
needDialer := true
needWithInsecure := true
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 {
gopts = append(gopts,
grpc.WithUnaryInterceptor(otgrpc.OpenTracingClientInterceptor(wt.tracer, otgrpc.LogPayloads())),
grpc.WithStreamInterceptor(otgrpc.OpenTracingStreamClientInterceptor(wt.tracer)))
}
if wd, ok := o.(*withDialer); ok {
gopts = append(gopts, grpc.WithDialer(wd.dialer))
needDialer = false
}
}
if needDialer {
dialFn, err := resolveDialer(address)
if err != nil {
return nil, err
}
// TODO(AkihiroSuda): use WithContextDialer (requires grpc 1.19)
// https://github.com/grpc/grpc-go/commit/40cb5618f475e7b9d61aa7920ae4b04ef9bbaf89
gopts = append(gopts, grpc.WithDialer(dialFn))
}
if needWithInsecure {
gopts = append(gopts, grpc.WithInsecure())
}
if address == "" {
address = appdefaults.Address
}
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) Close() error {
return c.conn.Close()
}
type withFailFast struct{}
func WithFailFast() ClientOpt {
return &withFailFast{}
}
type withDialer struct {
dialer func(string, time.Duration) (net.Conn, error)
}
func WithDialer(df func(string, time.Duration) (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 opentracing.Tracer) ClientOpt {
return &withTracer{t}
}
type withTracer struct {
tracer opentracing.Tracer
}
func resolveDialer(address string) (func(string, time.Duration) (net.Conn, error), error) {
ch, err := connhelper.GetConnectionHelper(address)
if err != nil {
return nil, err
}
if ch != nil {
f := func(a string, _ time.Duration) (net.Conn, error) {
ctx := context.Background()
return ch.ContextDialer(ctx, a)
}
return f, nil
}
// basic dialer
return dialer, nil
}