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listen.exs
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listen.exs
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Mix.install([:httpoison, :jason])
defmodule SSEClient do
# Retry interval in milliseconds
@retry_interval 5000
def connect(url, channels) do
headers = [
{"Accept", "text/event-stream"},
{"Content-Type", "application/json"},
{"Cache-Control", "no-cache"},
{"Connection", "keep-alive"},
{"Authorization",
"Bearer eyJhbGciOiJIUzUxMiIsInR5cCI6IkpXVCJ9.eyJ1c2VyX2lkIjoxfQ.rINrV4jad74K9b1W39TEKlqXpG63h-dn-yfqQpVEztuhomwW4lZ36j6cKl9IXLiq43zvmNjBlMOA_aCbgofQOg"}
]
body = Jason.encode!(%{"channels" => channels})
options = [stream_to: self(), recv_timeout: :infinity]
case HTTPoison.post(url, body, headers, options) do
{:ok, _} ->
IO.puts("Connected to #{url}")
receive_events(url, channels)
{:error, %HTTPoison.Error{reason: reason}} ->
IO.puts("Failed to connect: #{inspect(reason)}. Retrying in #{@retry_interval}ms...")
:timer.sleep(@retry_interval)
connect(url, channels)
end
end
defp receive_events(url, channels) do
receive do
%HTTPoison.AsyncChunk{chunk: chunk} ->
IO.puts("Received chunk: #{chunk}")
receive_events(url, channels)
%HTTPoison.AsyncEnd{} ->
IO.puts("Stream ended. Reconnecting...")
:timer.sleep(@retry_interval)
connect(url, channels)
%HTTPoison.Error{reason: reason} ->
IO.puts("Connection error: #{inspect(reason)}. Reconnecting...")
:timer.sleep(@retry_interval)
connect(url, channels)
end
end
end
url = "http://localhost:4000/sse"
SSEClient.connect(url, ["order.us.deliver", "order.eu.deliver"])