61 lines
1.5 KiB
Go
61 lines
1.5 KiB
Go
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package scripting
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import (
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"git.kirsle.net/apps/doodle/pkg/log"
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"github.com/robertkrimen/otto"
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)
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// Message holds data being published from one script VM with information sent
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// to the linked VMs.
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type Message struct {
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Name string
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Args []interface{}
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}
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/*
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RegisterPublishHooks adds the pub/sub hooks to a JavaScript VM.
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This adds the global methods `Message.Subscribe(name, func)` and
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`Message.Publish(name, args)` to the JavaScript VM's scope.
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*/
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func RegisterPublishHooks(vm *VM) {
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// Goroutine to watch the VM's inbound channel and invoke Subscribe handlers
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// for any matching messages received.
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go func() {
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for msg := range vm.Inbound {
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log.Warn("vm: %s msg: %+v", vm.Name, msg)
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if _, ok := vm.subscribe[msg.Name]; ok {
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for _, callback := range vm.subscribe[msg.Name] {
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callback.Call(otto.Value{}, msg.Args...)
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}
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}
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}
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}()
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// Register the Message.Subscribe and Message.Publish functions.
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vm.vm.Set("Message", map[string]interface{}{
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"Subscribe": func(name string, callback otto.Value) {
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log.Error("SUBSCRIBE: %s", name)
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if !callback.IsFunction() {
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log.Error("SUBSCRIBE(%s): callback is not a function", name)
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return
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}
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if _, ok := vm.subscribe[name]; !ok {
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vm.subscribe[name] = []otto.Value{}
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}
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vm.subscribe[name] = append(vm.subscribe[name], callback)
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},
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"Publish": func(name string, v ...interface{}) {
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log.Error("PUBLISH: %s %+v", name, v)
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for _, channel := range vm.Outbound {
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channel <- Message{
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Name: name,
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Args: v,
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}
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}
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},
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})
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}
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