62 lines
1.4 KiB
Go
62 lines
1.4 KiB
Go
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package rpc
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import (
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"fmt"
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"github.com/mitchellh/packer/packer"
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"io"
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"log"
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"net/rpc"
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"sync/atomic"
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)
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// Server represents an RPC server for Packer. This must be paired on
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// the other side with a Client.
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type Server struct {
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endpointId uint64
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rpcServer *rpc.Server
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}
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// NewServer returns a new Packer RPC server.
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func NewServer() *Server {
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return &Server{
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endpointId: 0,
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rpcServer: rpc.NewServer(),
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}
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}
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func (s *Server) RegisterArtifact(a packer.Artifact) {
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s.registerComponent("Artifact", &ArtifactServer{a}, false)
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}
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// ServeConn serves a single connection over the RPC server. It is up
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// to the caller to obtain a proper io.ReadWriteCloser.
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func (s *Server) ServeConn(conn io.ReadWriteCloser) {
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mux := NewMuxConn(conn)
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defer mux.Close()
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// Get stream ID 0, which we always use as the stream for serving
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// our RPC server on.
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stream, err := mux.Accept(0)
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if err != nil {
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log.Printf("[ERR] Error retrieving stream for serving: %s", err)
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return
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}
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s.rpcServer.ServeConn(stream)
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}
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// registerComponent registers a single Packer RPC component onto
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// the RPC server. If id is true, then a unique ID number will be appended
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// onto the end of the endpoint.
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//
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// The endpoint name is returned.
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func (s *Server) registerComponent(name string, rcvr interface{}, id bool) string {
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endpoint := name
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if id {
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fmt.Sprintf("%s.%d", endpoint, atomic.AddUint64(&s.endpointId, 1))
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}
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s.rpcServer.RegisterName(endpoint, rcvr)
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return endpoint
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}
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