91 lines
2.1 KiB
Go
91 lines
2.1 KiB
Go
package rpc
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import (
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"context"
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"log"
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"net/rpc"
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"github.com/hashicorp/packer/packer"
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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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mux *muxBroker
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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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context context.Context
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contextCancel func()
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p packer.Provisioner
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mux *muxBroker
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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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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, new(interface{})); 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(ctx context.Context, ui packer.Ui, comm packer.Communicator) error {
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nextId := p.mux.NextId()
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server := newServerWithMux(p.mux, nextId)
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server.RegisterCommunicator(comm)
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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 provisioner after context cancellation %v", ctx.Err())
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if err := p.client.Call("Provisioner.Cancel", new(interface{}), new(interface{})); err != nil {
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log.Printf("Error cancelling provisioner: %s", err)
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}
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case <-done:
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}
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}()
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return p.client.Call("Provisioner.Provision", nextId, new(interface{}))
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}
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func (p *ProvisionerServer) Prepare(args *ProvisionerPrepareArgs, reply *interface{}) error {
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return p.p.Prepare(args.Configs...)
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}
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func (p *ProvisionerServer) Provision(streamId uint32, reply *interface{}) 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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defer client.Close()
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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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if err := p.p.Provision(p.context, client.Ui(), client.Communicator()); 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.contextCancel()
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return nil
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}
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