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build.go
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build.go
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package rpc
import (
"net/rpc"
"github.com/mitchellh/packer/packer"
)
// An implementation of packer.Build where the build is actually executed
// over an RPC connection.
type build struct {
client *rpc.Client
mux *muxBroker
}
// BuildServer wraps a packer.Build implementation and makes it exportable
// as part of a Golang RPC server.
type BuildServer struct {
build packer.Build
mux *muxBroker
}
type BuildPrepareResponse struct {
Warnings []string
Error *BasicError
}
func (b *build) Name() (result string) {
b.client.Call("Build.Name", new(interface{}), &result)
return
}
func (b *build) Prepare() ([]string, error) {
var resp BuildPrepareResponse
if cerr := b.client.Call("Build.Prepare", new(interface{}), &resp); cerr != nil {
return nil, cerr
}
var err error = nil
if resp.Error != nil {
err = resp.Error
}
return resp.Warnings, err
}
func (b *build) Run(ui packer.Ui, cache packer.Cache) ([]packer.Artifact, error) {
nextId := b.mux.NextId()
server := newServerWithMux(b.mux, nextId)
server.RegisterCache(cache)
server.RegisterUi(ui)
go server.Serve()
var result []uint32
if err := b.client.Call("Build.Run", nextId, &result); err != nil {
return nil, err
}
artifacts := make([]packer.Artifact, len(result))
for i, streamId := range result {
client, err := newClientWithMux(b.mux, streamId)
if err != nil {
return nil, err
}
artifacts[i] = client.Artifact()
}
return artifacts, nil
}
func (b *build) SetDebug(val bool) {
if err := b.client.Call("Build.SetDebug", val, new(interface{})); err != nil {
panic(err)
}
}
func (b *build) SetForce(val bool) {
if err := b.client.Call("Build.SetForce", val, new(interface{})); err != nil {
panic(err)
}
}
func (b *build) SetOnError(val string) {
if err := b.client.Call("Build.SetOnError", val, new(interface{})); err != nil {
panic(err)
}
}
func (b *build) Cancel() {
if err := b.client.Call("Build.Cancel", new(interface{}), new(interface{})); err != nil {
panic(err)
}
}
func (b *BuildServer) Name(args *interface{}, reply *string) error {
*reply = b.build.Name()
return nil
}
func (b *BuildServer) Prepare(args *interface{}, resp *BuildPrepareResponse) error {
warnings, err := b.build.Prepare()
*resp = BuildPrepareResponse{
Warnings: warnings,
Error: NewBasicError(err),
}
return nil
}
func (b *BuildServer) Run(streamId uint32, reply *[]uint32) error {
client, err := newClientWithMux(b.mux, streamId)
if err != nil {
return NewBasicError(err)
}
defer client.Close()
artifacts, err := b.build.Run(client.Ui(), client.Cache())
if err != nil {
return NewBasicError(err)
}
*reply = make([]uint32, len(artifacts))
for i, artifact := range artifacts {
streamId := b.mux.NextId()
server := newServerWithMux(b.mux, streamId)
server.RegisterArtifact(artifact)
go server.Serve()
(*reply)[i] = streamId
}
return nil
}
func (b *BuildServer) SetDebug(val *bool, reply *interface{}) error {
b.build.SetDebug(*val)
return nil
}
func (b *BuildServer) SetForce(val *bool, reply *interface{}) error {
b.build.SetForce(*val)
return nil
}
func (b *BuildServer) SetOnError(val *string, reply *interface{}) error {
b.build.SetOnError(*val)
return nil
}
func (b *BuildServer) Cancel(args *interface{}, reply *interface{}) error {
b.build.Cancel()
return nil
}