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package rpc
import (
"io"
"log"
"net/rpc"
packersdk "github.com/hashicorp/packer/packer-plugin-sdk/packer"
"github.com/ugorji/go/codec"
)
const (
DefaultArtifactEndpoint string = "Artifact"
DefaultBuildEndpoint = "Build"
DefaultBuilderEndpoint = "Builder"
DefaultCacheEndpoint = "Cache"
DefaultCommandEndpoint = "Command"
DefaultCommunicatorEndpoint = "Communicator"
DefaultHookEndpoint = "Hook"
DefaultPostProcessorEndpoint = "PostProcessor"
DefaultProvisionerEndpoint = "Provisioner"
DefaultUiEndpoint = "Ui"
)
// Server represents an RPC server for Packer. This must be paired on
// the other side with a Client. In Packer, each "plugin" (builder, provisioner,
// and post-processor) creates and launches a server. The client created and
// used by the packer "core"
type Server struct {
mux *muxBroker
streamId uint32
server *rpc.Server
closeMux bool
}
// NewServer returns a new Packer RPC server.
func NewServer(conn io.ReadWriteCloser) (*Server, error) {
mux, err := newMuxBrokerServer(conn)
if err != nil {
return nil, err
}
result := newServerWithMux(mux, 0)
result.closeMux = true
go mux.Run()
return result, nil
}
func newServerWithMux(mux *muxBroker, streamId uint32) *Server {
return &Server{
mux: mux,
streamId: streamId,
server: rpc.NewServer(),
closeMux: false,
}
}
func (s *Server) Close() error {
if s.closeMux {
log.Printf("[WARN] Shutting down mux conn in Server")
return s.mux.Close()
}
return nil
}
func (s *Server) RegisterArtifact(a packersdk.Artifact) error {
return s.server.RegisterName(DefaultArtifactEndpoint, &ArtifactServer{
artifact: a,
})
}
func (s *Server) RegisterBuild(b packersdk.Build) error {
return s.server.RegisterName(DefaultBuildEndpoint, &BuildServer{
build: b,
mux: s.mux,
})
}
func (s *Server) RegisterBuilder(b packersdk.Builder) error {
return s.server.RegisterName(DefaultBuilderEndpoint, &BuilderServer{
commonServer: commonServer{
selfConfigurable: b,
mux: s.mux,
},
builder: b,
})
}
func (s *Server) RegisterCommunicator(c packersdk.Communicator) error {
return s.server.RegisterName(DefaultCommunicatorEndpoint, &CommunicatorServer{
c: c,
commonServer: commonServer{
mux: s.mux,
},
})
}
func (s *Server) RegisterHook(h packersdk.Hook) error {
return s.server.RegisterName(DefaultHookEndpoint, &HookServer{
hook: h,
mux: s.mux,
})
}
func (s *Server) RegisterPostProcessor(p packersdk.PostProcessor) error {
return s.server.RegisterName(DefaultPostProcessorEndpoint, &PostProcessorServer{
commonServer: commonServer{
selfConfigurable: p,
mux: s.mux,
},
p: p,
})
}
func (s *Server) RegisterProvisioner(p packersdk.Provisioner) error {
return s.server.RegisterName(DefaultProvisionerEndpoint, &ProvisionerServer{
commonServer: commonServer{
selfConfigurable: p,
mux: s.mux,
},
p: p,
})
}
func (s *Server) RegisterUi(ui packersdk.Ui) error {
return s.server.RegisterName(DefaultUiEndpoint, &UiServer{
ui: ui,
register: s.server.RegisterName,
})
}
// ServeConn serves a single connection over the RPC server. It is up
// to the caller to obtain a proper io.ReadWriteCloser.
func (s *Server) Serve() {
// Accept a connection on stream ID 0, which is always used for
// normal client to server connections.
stream, err := s.mux.Accept(s.streamId)
if err != nil {
log.Printf("[ERR] Error retrieving stream for serving: %s", err)
return
}
defer stream.Close()
h := &codec.MsgpackHandle{
WriteExt: true,
}
rpcCodec := codec.GoRpc.ServerCodec(stream, h)
s.server.ServeCodec(rpcCodec)
}
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