packer-cn/packer/rpc/provisioner.go

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2013-05-22 18:35:52 -04:00
package rpc
import (
"github.com/mitchellh/packer/packer"
"net/rpc"
)
// An implementation of packer.Provisioner where the provisioner is actually
// executed over an RPC connection.
type provisioner struct {
client *rpc.Client
}
// ProvisionerServer wraps a packer.Provisioner implementation and makes it
// exportable as part of a Golang RPC server.
type ProvisionerServer struct {
p packer.Provisioner
}
type ProvisionerPrepareArgs struct {
Config interface{}
RPCAddress string
}
type ProvisionerProvisionArgs struct {
RPCAddress string
}
func Provisioner(client *rpc.Client) *provisioner {
return &provisioner{client}
}
func (p *provisioner) Prepare(config interface{}, ui packer.Ui) {
// TODO: Error handling
server := rpc.NewServer()
RegisterUi(server, ui)
args := &ProvisionerPrepareArgs{config, serveSingleConn(server)}
p.client.Call("Provisioner.Prepare", args, new(interface{}))
}
func (p *provisioner) Provision(ui packer.Ui, comm packer.Communicator) {
// TODO: Error handling
server := rpc.NewServer()
RegisterCommunicator(server, comm)
RegisterUi(server, ui)
args := &ProvisionerProvisionArgs{serveSingleConn(server)}
p.client.Call("Provisioner.Provision", args, new(interface{}))
}
func (p *ProvisionerServer) Prepare(args *ProvisionerPrepareArgs, reply *interface{}) error {
client, err := rpc.Dial("tcp", args.RPCAddress)
if err != nil {
return err
}
ui := &Ui{client}
p.p.Prepare(args.Config, ui)
return nil
}
func (p *ProvisionerServer) Provision(args *ProvisionerProvisionArgs, reply *interface{}) error {
client, err := rpc.Dial("tcp", args.RPCAddress)
if err != nil {
return err
}
comm := Communicator(client)
ui := &Ui{client}
p.p.Provision(ui, comm)
return nil
}