119 lines
2.8 KiB
Go
119 lines
2.8 KiB
Go
package session
|
|
|
|
import (
|
|
"net"
|
|
|
|
"github.com/docker/docker/pkg/stringid"
|
|
"github.com/pkg/errors"
|
|
"golang.org/x/net/context"
|
|
"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"
|
|
)
|
|
|
|
// 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 expsed 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
|
|
}
|
|
|
|
// NewSession returns a new long running session
|
|
func NewSession(name, sharedKey string) (*Session, error) {
|
|
id := stringid.GenerateRandomID()
|
|
s := &Session{
|
|
id: id,
|
|
name: name,
|
|
sharedKey: sharedKey,
|
|
grpcServer: grpc.NewServer(),
|
|
}
|
|
|
|
grpc_health_v1.RegisterHealthServer(s.grpcServer, health.NewServer())
|
|
|
|
return s, nil
|
|
}
|
|
|
|
// Allow enable 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")
|
|
}
|
|
serve(ctx, s.grpcServer, conn)
|
|
return nil
|
|
}
|
|
|
|
// Close closes the session
|
|
func (s *Session) Close() error {
|
|
if s.cancelCtx != nil && s.done != nil {
|
|
s.grpcServer.Stop()
|
|
s.cancelCtx()
|
|
<-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
|
|
}
|