Chilkat2-Python

Subscribe to Multiple Bitfinex Tickers on One Connection

See more WebSocket Examples

Subscribes to multiple ticker symbols on the public Bitfinex websocket ticker channel and receives ticker updates. Chilkat2-Python

import sys
import chilkat2

success = False

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

ws = chilkat2.WebSocket()

# 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 = chilkat2.Rest()

# 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)
    print(responseBody)
    print(rest.ResponseHeader)
    sys.exit()

# 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")
    print("ReadFrame fail reason = " + str(ws.ReadFrameFailReason))
    print(ws.LastErrorText)
    sys.exit()

# We should get this:
# {"event":"info","version":1.1,"platform":{"status":1}}
print(ws.GetFrameData())

# Subscribe to the BTCUSD ticker feed.
# See https://docs.bitfinex.com/docs for more information.
json1 = chilkat2.JsonObject()
json1.AppendString("event","subscribe")
json1.AppendString("channel","ticker")
json1.AppendString("pair","BTCUSD")

finalFrame = True
success = ws.SendFrame(json1.Emit(),finalFrame)

# Subscribe to the ETHUSD ticker feed.
json2 = chilkat2.JsonObject()
json2.AppendString("event","subscribe")
json2.AppendString("channel","ticker")
json2.AppendString("pair","ETHUSD")

success = ws.SendFrame(json2.Emit(),finalFrame)

# Begin reading the ticker feed.
# / This will include a single confirmation response for each subscription.

# We'll just read the 1st 5 updates and then exit..
receivedFinalFrame = False
numUpdatesReceived = 0
while numUpdatesReceived < 7 :

    success = ws.ReadFrame()
    if (success != True):
        print("Failed to receive a frame")
        print("ReadFrame fail reason = " + str(ws.ReadFrameFailReason))
        print(ws.LastErrorText)
        sys.exit()

    # The responses we desire are in Text frames, where the opcode = 1.
    if (ws.FrameOpcodeInt == 1):
        receivedText = ws.GetFrameData()
        print(receivedText)
        # 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]
        # Initially, a single confirmation response for each subscription would be received, such as this:
        # {"event":"subscribed","channel":"ticker","chanId":810,"pair":"BTCUSD"}
        numUpdatesReceived = numUpdatesReceived + 1

# This is sample output:
# You can see that the 1st message received is the subscription confirmation for the BTCUSD subscribe request.
# The next message is a BTCUSD ticker update.
# The next message is the confirmation for the ETHUSD subscription.
# The next message is an ETHUSD update.
# The BTCUSD channel ID is "537", and the ETHUSD channel ID is "700".  The channel IDs are provided in the 
# subscription confirmation messages.  Each ticker update begins with the channel ID..

# {"event":"subscribed","channel":"ticker","chanId":537,"pair":"BTCUSD"}
# [537,6457.9,79.59102302,6458,22.49395741,-24.1,-0.0037,6457.9,13644.52820029,6540,6370.76958739]
# {"event":"subscribed","channel":"ticker","chanId":700,"pair":"ETHUSD"}
# [700,496.9,247.24493326,496.92,284.09636979,-2.47,-0.0049,496.9,74154.05945261,502.85,486.96]
# [537,"hb"]
# [700,"hb"]
# [700,496.92,233.34338276,496.93,431.78867277,-2.45,-0.0049,496.92,74167.99173586,502.85,486.96]

# Close the websocket connection.
success = ws.SendClose(True,1000,"Closing this websocket.")
if (success != True):
    print(ws.LastErrorText)
    sys.exit()

# Read the Close response.
success = ws.ReadFrame()
if (success != True):
    print("ReadFrame fail reason = " + str(ws.ReadFrameFailReason))
    print(ws.LastErrorText)
    sys.exit()

print("Success.")