Enable RPC Server

[ansermino]

• Introduces rpc command to cli (rest-server)
• Moves server/rpc to rpc/
• Enables module selection (eg. "web3" or "eth" or "web3,eth"), however there is no CLI flag to configure these (See Allow Configuration of RPC Modules #74)
  • Defaults to {"web3", "eth"}
• Adds CLI context to eth API
  • CliContext.GetNode() can be used to retrieve SDK client to query for API calls

Note: Port (and listening address) can configured using --laddr, provided by the default REST server command.

Testing

1. You can start the daemon with a command such as:
   make install && rm -rf ~/.emint* && emintd init moniker --chain-id testchain && emintcli config chain-id testchain && emintcli config output json && emintcli config indent true && emintcli config trust-node true && emintcli keys add austin && emintd add-genesis-account $(emintcli keys show austin -a) 1000photon,100000000stake && emintd gentx --name austin && emintd collect-gentxs && emintd validate-genesis && emintd start

2. Start the server in another terminal:
   emintcli rest-server --laddr "tcp://localhost:8545

3. In another terminal:
   curl -X POST --data '{"jsonrpc":"2.0","method":"web3_clientVersion","params":[],"id":67}' -H "Content-Type: application/json" http://localhost:8545/rpc

Expected response (id, result will differ):
{"jsonrpc":"2.0","id":67,"result":"Ethermint/0.0.0+08c5e36/linux/go1.12.6"}

[austinabell]

:D as discussed in person we should look into integrating these routes into the evm SDK module in the future