packer-cn/packer/rpc/provisioner.go

74 lines
1.6 KiB
Go

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 {
Configs []interface{}
}
type ProvisionerProvisionArgs struct {
RPCAddress string
}
func Provisioner(client *rpc.Client) *provisioner {
return &provisioner{client}
}
func (p *provisioner) Prepare(configs ...interface{}) (err error) {
args := &ProvisionerPrepareArgs{configs}
if cerr := p.client.Call("Provisioner.Prepare", args, &err); cerr != nil {
err = cerr
}
return
}
func (p *provisioner) Provision(ui packer.Ui, comm packer.Communicator) error {
// TODO: Error handling
server := rpc.NewServer()
RegisterCommunicator(server, comm)
RegisterUi(server, ui)
args := &ProvisionerProvisionArgs{serveSingleConn(server)}
return p.client.Call("Provisioner.Provision", args, new(interface{}))
}
func (p *ProvisionerServer) Prepare(args *ProvisionerPrepareArgs, reply *error) error {
*reply = p.p.Prepare(args.Configs...)
if *reply != nil {
*reply = NewBasicError(*reply)
}
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}
if err := p.p.Provision(ui, comm); err != nil {
return NewBasicError(err)
}
return nil
}