what is the api variable value in function loop(self, api, request)

[pte1601]

Hello James
I am trying to use your deribit ws api to retrieve market data. I am struggling what is the value of the api variable in the loop function? Maybe you have also a quick example to retrieve market data?
Thanks for your assistance. Greetings, Peter

[Jimmy-sha256]

Hi the api variable determines whether we are connecting to the public or private endpoint.

The function async def private_api(self, request): returns the variable containing the data for a private api connection and

async def public_api(self, request): returns the variable containing the data for a public api connection

I hope this makes sense, if you bear with me I will put an example together showing how to retrive market data.

[Jimmy-sha256]

A quick example of a single script that will fetch the index prices of test net eth / btc, hope this helps. Let me know if your still struggling or want an example doing for a particular end point.

import asyncio
import websockets
import json

client_id = 'enter_client_id_here'
client_secret = 'enter_client_secret_here'
client_url = 'wss://test.deribit.com/ws/api/v2'

# create a websocket object
class WS_Client(object):
    def __init__(self, client_id=None, client_secret=None):
        self.client_id = client_id
        self.client_secret = client_secret
        self.client_url = client_url
        self.json = {
            "jsonrpc" : "2.0",
            "id" : 1,
            "method" : None,
        }


# send a public method request
    async def public_api(self, request):
        async with websockets.connect(self.client_url) as websocket:
            await websocket.send(request)
            response = await websocket.recv()
            response = json.loads(response)
            return response


# create an asyncio event loop
    def loop(self, api, request):
        response = asyncio.get_event_loop().run_until_complete(
            api(json.dumps(request)))
        return response


# example get index function https://docs.deribit.com/?python#public-get_index

    def index(self, currency):
        options = {"currency" : currency}
        self.json["method"] = "public/get_index"
        self.json["params"] = options
        return self.loop(self.public_api, self.json)

client = WS_Client(client_id, client_secret)

btc_index = client.index('BTC')
eth_index = client.index('ETH')

print(btc_index)
print(eth_index)