147 lines
3.6 KiB
Go
147 lines
3.6 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.PostProcessor where the PostProcessor is actually
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// executed over an RPC connection.
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type postProcessor struct {
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commonClient
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}
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// PostProcessorServer wraps a packer.PostProcessor implementation and makes it
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// exportable as part of a Golang RPC server.
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type PostProcessorServer struct {
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context context.Context
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contextCancel func()
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commonServer
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p packer.PostProcessor
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}
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type PostProcessorConfigureArgs struct {
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Configs []interface{}
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}
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type PostProcessorProcessResponse struct {
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Err *BasicError
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Keep bool
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ForceOverride bool
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StreamId uint32
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}
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func (p *postProcessor) Configure(raw ...interface{}) error {
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raw, err := encodeCTYValues(raw)
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if err != nil {
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return err
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}
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args := &PostProcessorConfigureArgs{Configs: raw}
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return p.client.Call(p.endpoint+".Configure", args, new(interface{}))
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}
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func (p *postProcessor) PostProcess(ctx context.Context, ui packer.Ui, a packer.Artifact) (packer.Artifact, bool, bool, error) {
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nextId := p.mux.NextId()
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server := newServerWithMux(p.mux, nextId)
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server.RegisterArtifact(a)
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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 post-processor after context cancellation %v", ctx.Err())
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if err := p.client.Call(p.endpoint+".Cancel", new(interface{}), new(interface{})); err != nil {
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log.Printf("Error cancelling post-processor: %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 response PostProcessorProcessResponse
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if err := p.client.Call(p.endpoint+".PostProcess", nextId, &response); err != nil {
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return nil, false, false, err
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}
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if response.Err != nil {
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return nil, false, false, response.Err
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}
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if response.StreamId == 0 {
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return nil, false, false, nil
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}
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client, err := newClientWithMux(p.mux, response.StreamId)
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if err != nil {
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return nil, false, false, err
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}
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return client.Artifact(), response.Keep, response.ForceOverride, nil
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}
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func (p *PostProcessorServer) Configure(args *PostProcessorConfigureArgs, reply *interface{}) (err 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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err = p.p.Configure(config...)
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return err
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}
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func (p *PostProcessorServer) PostProcess(streamId uint32, reply *PostProcessorProcessResponse) error {
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client, err := newClientWithMux(p.mux, streamId)
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if err != nil {
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return NewBasicError(err)
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}
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if p.context == nil {
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p.context, p.contextCancel = context.WithCancel(context.Background())
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}
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artifact := client.Artifact()
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artifactResult, keep, forceOverride, err := p.p.PostProcess(p.context, client.Ui(), artifact)
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*reply = PostProcessorProcessResponse{
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Err: NewBasicError(err),
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Keep: keep,
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ForceOverride: forceOverride,
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StreamId: 0,
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}
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if err != nil {
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log.Printf("error: %v", err)
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client.Close()
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return nil
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}
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if artifactResult != artifact {
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// Sometimes, the artifact returned by PostProcess is the artifact from
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// client.Artifact() and in that case we don't want to close client;
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// otherwise the outcome is sort of undetermined. See [GH-9995] for a
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// good test file.
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defer client.Close()
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}
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if artifactResult != nil {
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streamId = p.mux.NextId()
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reply.StreamId = streamId
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server := newServerWithMux(p.mux, streamId)
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if err := server.RegisterArtifact(artifactResult); err != nil {
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return err
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}
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go server.Serve()
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}
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return nil
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}
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func (b *PostProcessorServer) Cancel(args *interface{}, reply *interface{}) error {
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if b.contextCancel != nil {
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b.contextCancel()
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}
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return nil
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}
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