фото показано с : bitcoints.com

Since our project will be fetching the price of a Bitcoin, we need a place to fetch Bitcoin data.
Finally let’s get the price with Map.get, now that we have the price let’s print what the price was.
lib/teacher/coin_data_worker.ex

defmodule Teacher.CoinDataWorker do
use GenServer

def start_link(args) do
GenServer.start_link(__MODULE__, args, name: __MODULE__)
end

def init(state) do
schedule_coin_fetch()
{:ok, state}
end

def handle_info(:coin_fetch, state) do
price = coin_price()
IO.inspect(“Current Bitcoin price is $#{price}”)
schedule_coin_fetch()
{:noreply, Map.put(state, :btc, price)}
end

defp coin_price do
“http://coincap.io/page/BTC”
|> HTTPoison.get!
$ iex -S mix
“Current Bitcoin price is $6149.728”
“Current Bitcoin price is $6149.728”
“Current Bitcoin price is $6149.728”
“Current Bitcoin price is $6149.728”
> :observer.start()
This is great – we’re fetching data from the API, parsing it, and logging the price.
$ iex -S mix
> “Current Litecoin price is $81.0156”
“Current Ethereum price is $454.076”
“Current Bitcoin price is $6148.09”
> :observer.start()
And let’s start the observer.

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