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session.go
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session.go
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package session
import (
"context"
"net"
"strings"
grpc_middleware "github.com/grpc-ecosystem/go-grpc-middleware"
"github.com/moby/buildkit/identity"
"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/health"
"google.golang.org/grpc/health/grpc_health_v1"
)
const (
headerSessionID = "X-Docker-Expose-Session-Uuid"
headerSessionName = "X-Docker-Expose-Session-Name"
headerSessionSharedKey = "X-Docker-Expose-Session-Sharedkey"
headerSessionMethod = "X-Docker-Expose-Session-Grpc-Method"
)
var propagators = propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{})
// Dialer returns a connection that can be used by the session
type Dialer func(ctx context.Context, proto string, meta map[string][]string) (net.Conn, error)
// Attachable defines a feature that can be exposed on a session
type Attachable interface {
Register(*grpc.Server)
}
// Session is a long running connection between client and a daemon
type Session struct {
id string
name string
sharedKey string
ctx context.Context
cancelCtx func()
done chan struct{}
grpcServer *grpc.Server
conn net.Conn
}
// NewSession returns a new long running session
func NewSession(ctx context.Context, name, sharedKey string) (*Session, error) {
id := identity.NewID()
var unary []grpc.UnaryServerInterceptor
var stream []grpc.StreamServerInterceptor
serverOpts := []grpc.ServerOption{}
if span := trace.SpanFromContext(ctx); span.SpanContext().IsValid() {
unary = append(unary, filterServer(otelgrpc.UnaryServerInterceptor(otelgrpc.WithTracerProvider(span.TracerProvider()), otelgrpc.WithPropagators(propagators))))
stream = append(stream, otelgrpc.StreamServerInterceptor(otelgrpc.WithTracerProvider(span.TracerProvider()), otelgrpc.WithPropagators(propagators)))
}
unary = append(unary, grpcerrors.UnaryServerInterceptor)
stream = append(stream, grpcerrors.StreamServerInterceptor)
if len(unary) == 1 {
serverOpts = append(serverOpts, grpc.UnaryInterceptor(unary[0]))
} else if len(unary) > 1 {
serverOpts = append(serverOpts, grpc.UnaryInterceptor(grpc_middleware.ChainUnaryServer(unary...)))
}
if len(stream) == 1 {
serverOpts = append(serverOpts, grpc.StreamInterceptor(stream[0]))
} else if len(stream) > 1 {
serverOpts = append(serverOpts, grpc.StreamInterceptor(grpc_middleware.ChainStreamServer(stream...)))
}
s := &Session{
id: id,
name: name,
sharedKey: sharedKey,
grpcServer: grpc.NewServer(serverOpts...),
}
grpc_health_v1.RegisterHealthServer(s.grpcServer, health.NewServer())
return s, nil
}
// Allow enables a given service to be reachable through the grpc session
func (s *Session) Allow(a Attachable) {
a.Register(s.grpcServer)
}
// ID returns unique identifier for the session
func (s *Session) ID() string {
return s.id
}
// Run activates the session
func (s *Session) Run(ctx context.Context, dialer Dialer) error {
ctx, cancel := context.WithCancel(ctx)
s.cancelCtx = cancel
s.done = make(chan struct{})
defer cancel()
defer close(s.done)
meta := make(map[string][]string)
meta[headerSessionID] = []string{s.id}
meta[headerSessionName] = []string{s.name}
meta[headerSessionSharedKey] = []string{s.sharedKey}
for name, svc := range s.grpcServer.GetServiceInfo() {
for _, method := range svc.Methods {
meta[headerSessionMethod] = append(meta[headerSessionMethod], MethodURL(name, method.Name))
}
}
conn, err := dialer(ctx, "h2c", meta)
if err != nil {
return errors.Wrap(err, "failed to dial gRPC")
}
s.conn = conn
serve(ctx, s.grpcServer, conn)
return nil
}
// Close closes the session
func (s *Session) Close() error {
if s.cancelCtx != nil && s.done != nil {
if s.conn != nil {
s.conn.Close()
}
s.grpcServer.Stop()
<-s.done
}
return nil
}
func (s *Session) context() context.Context {
return s.ctx
}
func (s *Session) closed() bool {
select {
case <-s.context().Done():
return true
default:
return false
}
}
// MethodURL returns a gRPC method URL for service and method name
func MethodURL(s, m string) string {
return "/" + s + "/" + m
}
// updates needed in opentelemetry-contrib to avoid this
func filterServer(intercept grpc.UnaryServerInterceptor) grpc.UnaryServerInterceptor {
return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (resp interface{}, err error) {
if strings.HasSuffix(info.FullMethod, "Health/Check") {
return handler(ctx, req)
}
return intercept(ctx, req, info, handler)
}
}
func filterClient(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, "Health/Check") {
return invoker(ctx, method, req, reply, cc, opts...)
}
return intercept(ctx, method, req, reply, cc, invoker, opts...)
}
}