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(Ruby) Read Bitfinex WebSocket Ticker Channel

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

Chilkat Ruby Downloads

Ruby Library for Linux and MAC OS X

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";

 

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