91 lines
2.0 KiB
Go
91 lines
2.0 KiB
Go
package rpc
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import (
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"context"
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"log"
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"sync"
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packersdk "github.com/hashicorp/packer/packer-plugin-sdk/packer"
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)
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// An implementation of packersdk.Hook where the hook is actually executed
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// over an RPC connection.
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type hook struct {
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commonClient
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}
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// HookServer wraps a packersdk.Hook implementation and makes it exportable
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// as part of a Golang RPC server.
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type HookServer struct {
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context context.Context
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contextCancel func()
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hook packersdk.Hook
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lock sync.Mutex
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mux *muxBroker
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}
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type HookRunArgs struct {
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Name string
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Data interface{}
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StreamId uint32
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}
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func (h *hook) Run(ctx context.Context, name string, ui packersdk.Ui, comm packersdk.Communicator, data interface{}) error {
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nextId := h.mux.NextId()
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server := newServerWithMux(h.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 hook after context cancellation %v", ctx.Err())
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if err := h.client.Call(h.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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args := HookRunArgs{
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Name: name,
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Data: data,
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StreamId: nextId,
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}
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return h.client.Call(h.endpoint+".Run", &args, new(interface{}))
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}
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func (h *HookServer) Run(args *HookRunArgs, reply *interface{}) error {
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client, err := newClientWithMux(h.mux, args.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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h.lock.Lock()
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if h.context == nil {
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h.context, h.contextCancel = context.WithCancel(context.Background())
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}
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h.lock.Unlock()
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if err := h.hook.Run(h.context, args.Name, client.Ui(), client.Communicator(), args.Data); err != nil {
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return NewBasicError(err)
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}
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*reply = nil
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return nil
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}
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func (h *HookServer) Cancel(args *interface{}, reply *interface{}) error {
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h.lock.Lock()
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if h.contextCancel != nil {
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h.contextCancel()
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}
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h.lock.Unlock()
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return nil
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}
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