README: update live/backtest websocket usage

README.md

@@ -1 +1,82 @@
-# bitfinex-api-py
+# Official Python `bfxapi`
+This repo contains an official python library that is used to connect to the both the Bitfinex api and the Honey Frameworks data-server. The library communicates with these servers using both websocket connection and a REST interface.
+
+## `bfxapi.LiveWebsocket`
+The websocket exposes a collection of events that are triggered when certain data is received. Here is a full list of available events:
+
+- `all`: listen for all messages coming through
+- `connected:` called when a connection is made
+- `authenticated`: called when the websocket passes authentication
+- `message` (string): new incoming message from the websocket
+- `notification` (array): incoming account notification
+- `error` (string): error from the websocket
+- `order_closed` (string): when an order confirmation is recieved
+- `wallet_snapshot` (string): Initial wallet balances (Fired once)
+- `order_snapshot` (string): Initial open orders (Fired once)
+- `positions_snapshot` (string): Initial open positions (Fired once)
+- `wallet_update` (string): changes to the balance of wallets
+- `seed_candle` (candleArray): initial past candle to prime strategy
+- `seed_trade` (tradeArray): initial past trade to prime strategy
+- `funding_offer_snapshot`: opening funding offer balances
+- `funding_loan_snapshot`:opening funding loan balances
+- `funding_credit_snapshot`: opening funding credit balances
+- `balance_update` when the state of a balance is changed
+- `new_trade`: a new trade on the market has been executed
+- `new_candle`: a new candle has been produced
+
+For example. If you wanted to subscribe to all of the trades on the `tBTCUSD` market, then you can simply listen to the `new_trade` event. For Example:
+
+```
+ws = LiveBfxWebsocket(
+  logLevel='INFO'
+)
+
+@ws.on('new_trade')
+def log_trade(trade):
+  print ("New trade: {}".format(trade))
+
+@ws.on('connected')
+def start():
+  ws.subscribe('trades', 'tBTCUSD')
+
+ws.run()
+```
+
+NOTE: Instead of using the python decorators, you can also listen to events via function call:
+
+```
+ws.on('new_trade', log_trade)
+```
+
+## `bfxapi.DataServerWebsocket`
+
+The data-server websocket is used for retrieving large amounts of historical data from a `bfx-hf-data-server` instance. The library then takes all of the incoming historical data from the server and pushes it down the `new_trade` and `new_candle` events. For information on how to start a data-server instance please visit the repo at: https://github.com/bitfinexcom/bfx-hf-data-server
+
+A list of events available:
+
+- `connected`: connection is made
+- `new_trade`: a historical trade item is received
+- `new_candle`: a historical candle item is received
+- `done`: backtest has finished running
+
+An example of a script that loads all of the historical trades for symbol `tBTCUSD` over the last 2 days:
+
+```
+ws = DataServerWebsocket(
+  symbol='tBTCUSD',
+  host='ws://localhost:8899'
+)
+
+@ws.on('new_trade')
+def trade(trade):
+  print ("Backtest trade: {}".format(trade))
+
+@ws.on('done')
+def finish():
+  print ("Backtest complete!")
+
+now = int(round(time.time() * 1000))
+then = now - (1000 * 60 * 60 * 24 * 2) # 2 days ago
+ws.run(then, now)
+
+```