87 lines
1.9 KiB
Go
87 lines
1.9 KiB
Go
package rpc
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import (
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"github.com/mitchellh/packer/packer"
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"log"
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"net/rpc"
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)
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// An implementation of packer.Provisioner where the provisioner is actually
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// executed over an RPC connection.
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type provisioner struct {
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client *rpc.Client
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}
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// ProvisionerServer wraps a packer.Provisioner implementation and makes it
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// exportable as part of a Golang RPC server.
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type ProvisionerServer struct {
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p packer.Provisioner
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}
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type ProvisionerPrepareArgs struct {
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Configs []interface{}
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}
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type ProvisionerProvisionArgs struct {
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RPCAddress string
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}
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func Provisioner(client *rpc.Client) *provisioner {
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return &provisioner{client}
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}
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func (p *provisioner) Prepare(configs ...interface{}) (err error) {
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args := &ProvisionerPrepareArgs{configs}
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if cerr := p.client.Call("Provisioner.Prepare", args, &err); cerr != nil {
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err = cerr
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}
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return
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}
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func (p *provisioner) Provision(ui packer.Ui, comm packer.Communicator) error {
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// TODO: Error handling
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server := rpc.NewServer()
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RegisterCommunicator(server, comm)
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RegisterUi(server, ui)
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args := &ProvisionerProvisionArgs{serveSingleConn(server)}
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return p.client.Call("Provisioner.Provision", args, new(interface{}))
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}
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func (p *provisioner) Cancel() {
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err := p.client.Call("Provisioner.Cancel", new(interface{}), new(interface{}))
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if err != nil {
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log.Printf("Provisioner.Cancel err: %s", err)
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}
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}
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func (p *ProvisionerServer) Prepare(args *ProvisionerPrepareArgs, reply *error) error {
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*reply = p.p.Prepare(args.Configs...)
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if *reply != nil {
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*reply = NewBasicError(*reply)
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}
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return nil
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}
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func (p *ProvisionerServer) Provision(args *ProvisionerProvisionArgs, reply *interface{}) error {
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client, err := rpc.Dial("tcp", args.RPCAddress)
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if err != nil {
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return err
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}
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comm := Communicator(client)
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ui := &Ui{client}
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if err := p.p.Provision(ui, comm); err != nil {
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return NewBasicError(err)
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}
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return nil
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}
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func (p *ProvisionerServer) Cancel(args *interface{}, reply *interface{}) error {
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p.p.Cancel()
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return nil
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}
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