138 lines
3.0 KiB
Go
138 lines
3.0 KiB
Go
package rpc
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import (
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"context"
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"log"
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"github.com/hashicorp/packer/packer"
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)
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// An implementation of packer.Builder where the builder is actually executed
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// over an RPC connection.
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type builder struct {
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commonClient
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}
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// BuilderServer wraps a packer.Builder implementation and makes it exportable
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// as part of a Golang RPC server.
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type BuilderServer struct {
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context context.Context
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contextCancel func()
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commonServer
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builder packer.Builder
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}
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type BuilderPrepareArgs struct {
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Configs []interface{}
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}
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type BuilderPrepareResponse struct {
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GeneratedVars []string
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Warnings []string
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Error *BasicError
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}
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func (b *builder) Prepare(config ...interface{}) ([]string, []string, error) {
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config, err := encodeCTYValues(config)
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if err != nil {
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return nil, nil, err
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}
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var resp BuilderPrepareResponse
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cerr := b.client.Call(b.endpoint+".Prepare", &BuilderPrepareArgs{config}, &resp)
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if cerr != nil {
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return nil, nil, cerr
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}
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if resp.Error != nil {
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err = resp.Error
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}
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return resp.GeneratedVars, resp.Warnings, err
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}
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func (b *builder) Run(ctx context.Context, ui packer.Ui, hook packer.Hook) (packer.Artifact, error) {
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nextId := b.mux.NextId()
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server := newServerWithMux(b.mux, nextId)
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server.RegisterHook(hook)
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server.RegisterUi(ui)
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go server.Serve()
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done := make(chan interface{})
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defer close(done)
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go func() {
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select {
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case <-ctx.Done():
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log.Printf("Cancelling builder after context cancellation %v", ctx.Err())
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if err := b.client.Call(b.endpoint+".Cancel", new(interface{}), new(interface{})); err != nil {
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log.Printf("Error cancelling builder: %s", err)
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}
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case <-done:
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}
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}()
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var responseId uint32
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if err := b.client.Call(b.endpoint+".Run", nextId, &responseId); err != nil {
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return nil, err
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}
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if responseId == 0 {
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return nil, nil
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}
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client, err := newClientWithMux(b.mux, responseId)
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if err != nil {
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return nil, err
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}
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return client.Artifact(), nil
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}
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func (b *BuilderServer) Prepare(args *BuilderPrepareArgs, reply *BuilderPrepareResponse) error {
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config, err := decodeCTYValues(args.Configs)
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if err != nil {
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return err
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}
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generated, warnings, err := b.builder.Prepare(config...)
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*reply = BuilderPrepareResponse{
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GeneratedVars: generated,
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Warnings: warnings,
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Error: NewBasicError(err),
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}
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return nil
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}
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func (b *BuilderServer) Run(streamId uint32, reply *uint32) error {
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client, err := newClientWithMux(b.mux, streamId)
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if err != nil {
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return NewBasicError(err)
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}
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defer client.Close()
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if b.context == nil {
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b.context, b.contextCancel = context.WithCancel(context.Background())
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}
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artifact, err := b.builder.Run(b.context, client.Ui(), client.Hook())
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if err != nil {
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return NewBasicError(err)
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}
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*reply = 0
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if artifact != nil {
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streamId = b.mux.NextId()
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artifactServer := newServerWithMux(b.mux, streamId)
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artifactServer.RegisterArtifact(artifact)
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go artifactServer.Serve()
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*reply = streamId
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}
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return nil
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}
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func (b *BuilderServer) Cancel(args *interface{}, reply *interface{}) error {
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b.contextCancel()
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return nil
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}
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