implement JSON RPC

[wanderer]

https://github.com/ethereum/wiki/wiki/Generic-JSON-RPC

[wanderer]

transact and blanceAt should be priority to support wallelts

[wanderer]

the RPC has been split into two files ethRPC.js which uses defines the functions for the RPC and wsRPC.js which implements WS server.

[Latrasis]

Just to get my head around the recent updates here (#31): Is the xhrRpc for the server instance (+CORS?) and wsRPC for a tool instance?

[kumavis]

xhrRpc and wsRpc are two 'protocol adapters' for the implementation of the json rpc spec. They listen for messages over their protocol and pass them on to the core piece ethRpc that handles the actual execution and calculation of result.

[kumavis]

re: CORS - Cross Origin Resource Sharing
The browser requires special headers to allow js to read the response back from an xhr.
Now that I added them, a hosted app could hit your local ethereum client to read from the blockchain.
There are security risks to be considered here, so we'd likely want to create a whitelist mechanism.
The idea is that you could use a node-ethereum client as a publicly queryable service.

☁️ That thought lead me to wanting to change the spec to make the rpc stateless by removing eth_setDefaultBlock and related methods.

[Latrasis]

Looking at jsonp, it allows bypassing cors client-side