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client.go
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client.go
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package client
import (
"context"
"crypto/tls"
"crypto/x509"
"net"
"net/url"
"os"
"strings"
"time"
contentapi "github.com/containerd/containerd/api/services/content/v1"
"github.com/containerd/containerd/defaults"
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/moby/buildkit/util/tracing/otlptracegrpc"
"github.com/pkg/errors"
"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace"
"go.opentelemetry.io/otel/propagation"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
"go.opentelemetry.io/otel/trace"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/credentials/insecure"
)
type Client struct {
conn *grpc.ClientConn
sessionDialer func(ctx context.Context, proto string, meta map[string][]string) (net.Conn, error)
}
type ClientOpt interface {
isClientOpt()
}
// 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
var unary []grpc.UnaryClientInterceptor
var stream []grpc.StreamClientInterceptor
var customTracer bool // allows manually setting disabling tracing even if tracer in context
var tracerProvider trace.TracerProvider
var tracerDelegate TracerDelegate
var sessionDialer func(context.Context, string, map[string][]string) (net.Conn, error)
var customDialOptions []grpc.DialOption
var creds *withCredentials
for _, o := range opts {
if _, ok := o.(*withFailFast); ok {
gopts = append(gopts, grpc.FailOnNonTempDialError(true))
}
if credInfo, ok := o.(*withCredentials); ok {
if creds == nil {
creds = &withCredentials{}
}
creds = creds.merge(credInfo)
}
if wt, ok := o.(*withTracer); ok {
customTracer = true
tracerProvider = wt.tp
}
if wd, ok := o.(*withDialer); ok {
gopts = append(gopts, grpc.WithContextDialer(wd.dialer))
needDialer = false
}
if wt, ok := o.(*withTracerDelegate); ok {
tracerDelegate = wt
}
if sd, ok := o.(*withSessionDialer); ok {
sessionDialer = sd.dialer
}
if opt, ok := o.(*withGRPCDialOption); ok {
customDialOptions = append(customDialOptions, opt.opt)
}
}
if creds == nil {
gopts = append(gopts, grpc.WithTransportCredentials(insecure.NewCredentials()))
} else {
credOpts, err := loadCredentials(creds)
if err != nil {
return nil, err
}
gopts = append(gopts, credOpts)
}
if !customTracer {
if span := trace.SpanFromContext(ctx); span.SpanContext().IsValid() {
tracerProvider = span.TracerProvider()
}
}
if tracerProvider != nil {
var propagators = propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{})
unary = append(unary, filterInterceptor(otelgrpc.UnaryClientInterceptor(otelgrpc.WithTracerProvider(tracerProvider), otelgrpc.WithPropagators(propagators))))
stream = append(stream, otelgrpc.StreamClientInterceptor(otelgrpc.WithTracerProvider(tracerProvider), otelgrpc.WithPropagators(propagators)))
}
if needDialer {
dialFn, err := resolveDialer(address)
if err != nil {
return nil, err
}
gopts = append(gopts, grpc.WithContextDialer(dialFn))
}
if address == "" {
address = appdefaults.Address
}
// Setting :authority pseudo header
// - HTTP/2 (RFC7540) defines :authority pseudo header includes
// the authority portion of target URI but it must not include
// userinfo part (i.e. url.Host).
// ref: https://datatracker.ietf.org/doc/html/rfc7540#section-8.1.2.3
// - However, when TLS specified, grpc-go requires it must match
// with its servername specified for certificate validation.
var authority string
if creds != nil && creds.serverName != "" {
authority = creds.serverName
}
if authority == "" {
// authority as hostname from target address
uri, err := url.Parse(address)
if err != nil {
return nil, err
}
authority = uri.Host
}
gopts = append(gopts, grpc.WithAuthority(authority))
unary = append(unary, grpcerrors.UnaryClientInterceptor)
stream = append(stream, grpcerrors.StreamClientInterceptor)
gopts = append(gopts, grpc.WithChainUnaryInterceptor(unary...))
gopts = append(gopts, grpc.WithChainStreamInterceptor(stream...))
gopts = append(gopts, customDialOptions...)
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,
sessionDialer: sessionDialer,
}
if tracerDelegate != nil {
_ = c.setupDelegatedTracing(ctx, tracerDelegate) // ignore error
}
return c, nil
}
func (c *Client) setupDelegatedTracing(ctx context.Context, td TracerDelegate) error {
pd := otlptracegrpc.NewClient(c.conn)
e, err := otlptrace.New(ctx, pd)
if err != nil {
return nil
}
return td.SetSpanExporter(ctx, e)
}
func (c *Client) ControlClient() controlapi.ControlClient {
return controlapi.NewControlClient(c.conn)
}
func (c *Client) ContentClient() contentapi.ContentClient {
return contentapi.NewContentClient(c.conn)
}
func (c *Client) Dialer() session.Dialer {
return grpchijack.Dialer(c.ControlClient())
}
func (c *Client) Wait(ctx context.Context) error {
for {
_, err := c.ControlClient().Info(ctx, &controlapi.InfoRequest{})
if err == nil {
return nil
}
switch code := grpcerrors.Code(err); code {
case codes.Unavailable:
case codes.Unimplemented:
// only buildkit v0.11+ supports the info api, but an unimplemented
// response error is still a response so we can ignore it
return nil
default:
return err
}
select {
case <-ctx.Done():
return ctx.Err()
case <-time.After(time.Second):
}
c.conn.ResetConnectBackoff()
}
}
func (c *Client) Close() error {
return c.conn.Close()
}
type withFailFast struct{}
func (*withFailFast) isClientOpt() {}
func WithFailFast() ClientOpt {
return &withFailFast{}
}
type withDialer struct {
dialer func(context.Context, string) (net.Conn, error)
}
func (*withDialer) isClientOpt() {}
func WithContextDialer(df func(context.Context, string) (net.Conn, error)) ClientOpt {
return &withDialer{dialer: df}
}
type withCredentials struct {
// server options
serverName string
caCert string
caCertSystem bool
// client options
cert string
key string
}
func (opts *withCredentials) merge(opts2 *withCredentials) *withCredentials {
result := *opts
if opts2 == nil {
return &result
}
// server options
if opts2.serverName != "" {
result.serverName = opts2.serverName
}
if opts2.caCert != "" {
result.caCert = opts2.caCert
}
if opts2.caCertSystem {
result.caCertSystem = opts2.caCertSystem
}
// client options
if opts2.cert != "" {
result.cert = opts2.cert
}
if opts2.key != "" {
result.key = opts2.key
}
return &result
}
func (*withCredentials) isClientOpt() {}
// WithCredentials configures the TLS parameters of the client.
// Arguments:
// * cert: specifies the filepath of the client certificate
// * key: specifies the filepath of the client key
func WithCredentials(cert, key string) ClientOpt {
return &withCredentials{
cert: cert,
key: key,
}
}
// WithServerConfig configures the TLS parameters to connect to the server.
// Arguments:
// * serverName: specifies the server name to verify the hostname
// * caCert: specifies the filepath of the CA certificate
func WithServerConfig(serverName, caCert string) ClientOpt {
return &withCredentials{
serverName: serverName,
caCert: caCert,
}
}
// WithServerConfigSystem configures the TLS parameters to connect to the
// server, using the system's certificate pool.
func WithServerConfigSystem(serverName string) ClientOpt {
return &withCredentials{
serverName: serverName,
caCertSystem: true,
}
}
func loadCredentials(opts *withCredentials) (grpc.DialOption, error) {
cfg := &tls.Config{}
if opts.caCertSystem {
cfg.RootCAs, _ = x509.SystemCertPool()
}
if cfg.RootCAs == nil {
cfg.RootCAs = x509.NewCertPool()
}
if opts.caCert != "" {
ca, err := os.ReadFile(opts.caCert)
if err != nil {
return nil, errors.Wrap(err, "could not read ca certificate")
}
if ok := cfg.RootCAs.AppendCertsFromPEM(ca); !ok {
return nil, errors.New("failed to append ca certs")
}
}
if opts.serverName != "" {
cfg.ServerName = opts.serverName
}
// 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 = append(cfg.Certificates, cert)
}
return grpc.WithTransportCredentials(credentials.NewTLS(cfg)), nil
}
func WithTracerProvider(t trace.TracerProvider) ClientOpt {
return &withTracer{t}
}
type withTracer struct {
tp trace.TracerProvider
}
func (w *withTracer) isClientOpt() {}
type TracerDelegate interface {
SetSpanExporter(context.Context, sdktrace.SpanExporter) error
}
func WithTracerDelegate(td TracerDelegate) ClientOpt {
return &withTracerDelegate{
TracerDelegate: td,
}
}
type withTracerDelegate struct {
TracerDelegate
}
func (w *withTracerDelegate) isClientOpt() {}
func WithSessionDialer(dialer func(context.Context, string, map[string][]string) (net.Conn, error)) ClientOpt {
return &withSessionDialer{dialer}
}
type withSessionDialer struct {
dialer func(context.Context, string, map[string][]string) (net.Conn, error)
}
func (w *withSessionDialer) isClientOpt() {}
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
}
func filterInterceptor(intercept grpc.UnaryClientInterceptor) grpc.UnaryClientInterceptor {
return func(ctx context.Context, method string, req, reply interface{}, cc *grpc.ClientConn, invoker grpc.UnaryInvoker, opts ...grpc.CallOption) error {
if strings.HasSuffix(method, "opentelemetry.proto.collector.trace.v1.TraceService/Export") {
return invoker(ctx, method, req, reply, cc, opts...)
}
return intercept(ctx, method, req, reply, cc, invoker, opts...)
}
}
type withGRPCDialOption struct {
opt grpc.DialOption
}
func (*withGRPCDialOption) isClientOpt() {}
func WithGRPCDialOption(opt grpc.DialOption) ClientOpt {
return &withGRPCDialOption{opt}
}