(Ruby) WebSocket Binance Trade Stream (subscribe and receive updates)

Subscribe to a binance trade stream and receive updates.

For more information, see https://binance-docs.github.io/apidocs/spot/en/#live-subscribing-unsubscribing-to-streams

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 wss://stream.binance.com:9443
success = rest.Connect("stream.binance.com",9443,true,false)
if (success == false)
    print rest.lastErrorText() + "\n";
    exit
end

success = ws.UseConnection(rest)
if (success == false)
    print ws.lastErrorText() + "\n";
    exit
end

ws.AddClientHeaders()

#  Raw streams are accessed at /ws/<streamName>
responseBody = rest.fullRequestNoBody("GET","/ws/btcusdt")
if (rest.get_LastMethodSuccess() == false)
    print rest.lastErrorText() + "\n";
    exit
end

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

print responseBody + "\n";
print rest.responseHeader() + "\n";

# POST JSON to subscribe to a stream

# {
# "method": "SUBSCRIBE",
# "params":
# [
# "btcusdt@aggTrade",
# "btcusdt@depth"
# ],
# "id": 1
# }

json = Chilkat::CkJsonObject.new()
json.UpdateString("method","SUBSCRIBE")
json.UpdateString("params[0]","btcusdt@aggTrade")
json.UpdateString("params[1]","btcusdt@depth")
json.UpdateInt("id",1)

# Send a full message in a single frame
finalFrame = true
success = ws.SendFrame(json.emit(),finalFrame)
if (success != true)
    print ws.lastErrorText() + "\n";
    exit
end

jsonTradeData = Chilkat::CkJsonObject.new()
jsonTradeData.put_EmitCompact(false)

# Begin reading the trade stream response.
# We'll just read the 1st 10 updates and then exit..
receivedFinalFrame = false
numTradesReceived = 0
while numTradesReceived < 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)
        receivedJson = ws.getFrameData()

        jsonTradeData.Load(receivedJson)
        print jsonTradeData.emit() + "\n";

        numTradesReceived = numTradesReceived + 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";

# The output of the above code is shown here: