Is there support for callbacks? For example, can I invoke Elixir code to handle an event that occurs in JavaScript?
gushonorato
aglundahl
No, not yet. But I think we could add support for something like that. Can you please post an issue on GitHub and describe your use case?
1
gushonorato
bgoosman
It’s unsafe to allow user defined input, right? Since the code will eval in a Deno environment, which means access to the OS? I thought I’d use this as a means of enabling user defined transformations in JS, but I think I should explore a safer runtime environment. Maybe Lua?
0
cmo
bgoosman
bgoosman
Is there a better way to inject Elixir variables than serializing them into strings and injecting them into DenoRider.eval? I’m doing this currently.
defmodule GraphFxJS do
@moduledoc """
This module is used to run a JavaScript function on a graph, using DenoRider.
The graph has keys "nodes" and "edges".
The graph_fn is a JavaScript string like:
"""
def run(graph, graph_fn) do
graph_json = Jason.encode!(graph)
# Call the graph_fn with the graph_json as an argument
# i.e. IIFE pattern
js = "(#{graph_fn})(#{graph_json})"
case DenoRider.eval(js) do
{:ok, result} ->
result
other ->
raise "Error running graph_fn: #{inspect(other)}"
end
end
end
0
aglundahl
No, unfortunately not. I’m working on a more pleasant API for this, but I have no ETA for when it will be ready. I will make sure to post here when it is. 
0
aglundahl
Version 0.2.0 has been released. From the changelog:
Improvements
- A JavaScript API,
DenoRider.apply, is introduced for calling Elixir from
JavaScript. - Promises returned in
DenoRider.evalare resolved before being returned to
Elixir-land. - The JavaScript runtime now always gets a dedicated process. No need for
awaiting tasks anymore. DenoRider.eval!is introduced, which raises if the evaluation isn’t
successful.- Dependencies are upgraded.
Breaking changes
DenoRider.start_runtimeandDenoRider.stop_runtimeare removed. Use
DenoRider.startandDenoRider.stopinstead.DenoRider.eval/2no longer takes a:runtimeoption. Use the:pidoption
instead.DenoRider.eval/2no longer returns a task for manually managed runtimes.
2