Don't even bother dispatching common RPC calls.

[Yawning]

You know what's better than deduplication (#117)? Not hitting up the db for literally everything.

It isn't a particularly big stretch to assume that most of the queries will want information that is recent. A lot of the requests can omit hitting up the database if the gateway maintained a small cache of the n-most recent blocks (along with hashes and other metadata). As each gateway is currently (See: #84) stuck indexing everything, the cache can be updated as it indexes as well.

In the future, instances that do not have an indexer could either use a scanning-tolerant cache replacement policy, or use the same logic as long as the gateway always has an idea of what the most recently indexed block is.

[Yawning]

This is partially done by implementing a block cache. Transactions could also be cached, which I will do in a followup PR.

TODO:

• QueryTransaction
• GetTransactionRecipt
• GetLogs

[Yawning]

Fixed by #242 and #244