Rate limits

Pacifica implements IP based rate limiting.

For REST API:

1. every IP address begins with 100 credits

2. any http method used will decrement the credit by one (for now all requests have the same weighting)

3. if user makes request while credit < 0, then return HTTP429

4. credits reset back to 100 at the end of each 60 second interval

For Websocket API:

1. every IP address is limited to 100 concurrent WS connections.

2. If an IP tries to exceed 100 connections, returns HTTP 429

3. each connection is limited to 20 subscriptions per channel