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#!/usr/bin/env lua

--[[

Example of websocket client usage

- Connects to the gdax market data feed.

Documentation of feed: https://docs.gdax.com/#websocket-feed

- Sends a subscribe message

- Prints off 5 messages

- Close the socket and clean up.

]]

local websocket = require "http.websocket"

local ws = websocket.new_from_uri("wss://ws-feed.gdax.com")

assert(ws:connect())

assert(ws:send([[{"type": "subscribe", "product_id": "BTC-USD"}]]))

for _=1, 5 do

local data = assert(ws:receive())

print(data)

end

assert(ws:close())