(Ruby) Read Bitfinex WebSocket Ticker Channel

Subscribes to the public Bitfinex websocket ticker channel and receives ticker updates.

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

#  This example requires the Chilkat API to have been previously unlocked.
#  See Global Unlock Sample for sample code.

ws = Chilkat::CkWebSocket.new()

#  For brevity, this example does not check for errors when etablishing the WebSocket connection.
#  See Establish WebSocket Connection for more complete sample code for making the connection.

rest = Chilkat::CkRest.new()

#  Connect to api.bitfinex.com
success = rest.Connect("api.bitfinex.com",443,true,false)
ws.UseConnection(rest)
ws.AddClientHeaders()

responseBody = rest.fullRequestNoBody("GET","/ws")
success = ws.ValidateServerHandshake()
if (success != true)
    print ws.lastErrorText() + "\n";
    print responseBody + "\n";
    print rest.responseHeader() + "\n";
    exit
end

#  After connecting, the bitfinex websocket server will send
#  an info message that contains the actual version of the websocket stream.
#  Receive that message..
success = ws.ReadFrame()
if (success != true)
    print "Failed to receive a frame" + "\n";
    print "ReadFrame fail reason = " + ws.get_ReadFrameFailReason().to_s() + "\n";
    print ws.lastErrorText() + "\n";
    exit
end

#  We should get this:
#  {"event":"info","version":1.1,"platform":{"status":1}}
print ws.getFrameData() + "\n";

#  Subscribe to the public ticker feed.
#  See https://docs.bitfinex.com/docs for more information.
json = Chilkat::CkJsonObject.new()
json.AppendString("event","subscribe")
json.AppendString("channel","ticker")
json.AppendString("pair","BTCUSD")

finalFrame = true
success = ws.SendFrame(json.emit(),finalFrame)

#  Read the response.
success = ws.ReadFrame()
if (success != true)
    print "Failed to receive a frame" + "\n";
    print "ReadFrame fail reason = " + ws.get_ReadFrameFailReason().to_s() + "\n";
    print ws.lastErrorText() + "\n";
    exit
end

#  Examine the response
#  We should get this:
#  {"event":"subscribed","channel":"ticker","chanId":2751,"pair":"BTCUSD"}
print ws.getFrameData() + "\n";

#  Begin reading the ticker feed.
#  We'll just read the 1st 5 updates and then exit..
receivedFinalFrame = false
numUpdatesReceived = 0
while numUpdatesReceived < 5

    success = ws.ReadFrame()
    if (success != true)
        print "Failed to receive a frame" + "\n";
        print "ReadFrame fail reason = " + ws.get_ReadFrameFailReason().to_s() + "\n";
        print ws.lastErrorText() + "\n";
        exit
    end

    #  The responses we desire are in Text frames, where the opcode = 1.
    if (ws.get_FrameOpcodeInt() == 1)
        receivedText = ws.getFrameData()
        print receivedText + "\n";
        #  Should receive a line of text such as this:
        #  [2751,7349,36.34269559,7349.1,41.01777063,-116.2,-0.0156,7349.1,22188.26055319,7560,7270.5]
        numUpdatesReceived = numUpdatesReceived + 1
    end

end

#  Close the websocket connection.
success = ws.SendClose(true,1000,"Closing this websocket.")
if (success != true)
    print ws.lastErrorText() + "\n";
    exit
end

#  Read the Close response.
success = ws.ReadFrame()
if (success != true)
    print "ReadFrame fail reason = " + ws.get_ReadFrameFailReason().to_s() + "\n";
    print ws.lastErrorText() + "\n";
    exit
end

print "Success." + "\n";