(Classic ASP) Subscribe to Multiple Bitfinex Tickers on One Connection

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

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

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

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.WebSocket")
set ws = Server.CreateObject("Chilkat.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.

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.Rest")
set rest = Server.CreateObject("Chilkat.Rest")

' Connect to api.bitfinex.com
success = rest.Connect("api.bitfinex.com",443,1,0)
success = ws.UseConnection(rest)
success = ws.AddClientHeaders()

responseBody = rest.FullRequestNoBody("GET","/ws")
success = ws.ValidateServerHandshake()
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( ws.LastErrorText) & "</pre>"
    Response.Write "<pre>" & Server.HTMLEncode( responseBody) & "</pre>"
    Response.Write "<pre>" & Server.HTMLEncode( rest.ResponseHeader) & "</pre>"
    Response.End
End If

' 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 <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( "Failed to receive a frame") & "</pre>"
    Response.Write "<pre>" & Server.HTMLEncode( "ReadFrame fail reason = " & ws.ReadFrameFailReason) & "</pre>"
    Response.Write "<pre>" & Server.HTMLEncode( ws.LastErrorText) & "</pre>"
    Response.End
End If

' We should get this:
' {"event":"info","version":1.1,"platform":{"status":1}}
Response.Write "<pre>" & Server.HTMLEncode( ws.GetFrameData()) & "</pre>"

' Subscribe to the BTCUSD ticker feed.
' See https://docs.bitfinex.com/docs for more information.
' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.JsonObject")
set json1 = Server.CreateObject("Chilkat.JsonObject")
success = json1.AppendString("event","subscribe")
success = json1.AppendString("channel","ticker")
success = json1.AppendString("pair","BTCUSD")

finalFrame = 1
success = ws.SendFrame(json1.Emit(),finalFrame)

' Subscribe to the ETHUSD ticker feed.
' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.JsonObject")
set json2 = Server.CreateObject("Chilkat.JsonObject")
success = json2.AppendString("event","subscribe")
success = json2.AppendString("channel","ticker")
success = 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 = 0
numUpdatesReceived = 0
Do While numUpdatesReceived < 7

    success = ws.ReadFrame()
    If (success <> 1) Then
        Response.Write "<pre>" & Server.HTMLEncode( "Failed to receive a frame") & "</pre>"
        Response.Write "<pre>" & Server.HTMLEncode( "ReadFrame fail reason = " & ws.ReadFrameFailReason) & "</pre>"
        Response.Write "<pre>" & Server.HTMLEncode( ws.LastErrorText) & "</pre>"
        Response.End
    End If

    ' The responses we desire are in Text frames, where the opcode = 1.
    If (ws.FrameOpcodeInt = 1) Then
        receivedText = ws.GetFrameData()
        Response.Write "<pre>" & Server.HTMLEncode( receivedText) & "</pre>"
        ' 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
    End If

Loop

' 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(1,1000,"Closing this websocket.")
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( ws.LastErrorText) & "</pre>"
    Response.End
End If

' Read the Close response.
success = ws.ReadFrame()
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( "ReadFrame fail reason = " & ws.ReadFrameFailReason) & "</pre>"
    Response.Write "<pre>" & Server.HTMLEncode( ws.LastErrorText) & "</pre>"
    Response.End
End If

Response.Write "<pre>" & Server.HTMLEncode( "Success.") & "</pre>"

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