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EIP: calling user defined functions from SDK host #5

Description

@nilslice

Say a user uses the Go SDK and wants to "share" a Go function from their app to a plugin, making it an import to said plugin.

func logMessage(msg string) {
  log.Println("from plugin:", msg)
}

func main() {
  ext := extism.New()
  plugin := ext.LoadPlugin(...)

  // provide a handle to the function, adding some detail about 
  // what function to call, the "namespace" (module namespace 
  // to import from in wasm), the function name within wasm, and 
  // its params/returns
  plugin.AddFunc(logMessage, "AcmeAppLib", "log",  ...params) // tbd, how to declare the params/returns here



  out, err := plugin.Call(...)
  // ...
}

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