Accept addr

To start receiving JSON-RPC requests, we'll need to configure a JSON-RPC accept address.

We'll add a rpc struct (RpcSettingsOpt) containing a rpc_listen address to our Args struct. It will look like this:

#[derive(Clone, Debug, Deserialize, StructOpt, StructOptToml)]
#[serde(default)]
#[structopt(name = "dchat", about = cli_desc!())]
struct Args {
    #[structopt(flatten)]
    /// JSON-RPC settings
    rpc: RpcSettingsOpt,

    #[structopt(short, long)]
    /// Configuration file to use
    config: Option<String>,

    #[structopt(short, long)]
    /// Set log file to ouput into
    log: Option<String>,

    #[structopt(short, parse(from_occurrences))]
    /// Increase verbosity (-vvv supported)
    verbose: u8,

    #[structopt(flatten)]
    /// P2P network settings
    net: SettingsOpt,
}

This encodes a default rpc_listen address on the port 51054. To be able to modify the default, we can also add rpc_listen to the default config at ../dchatd_config.toml as follows:

# dchat toml

[rpc]
## RPC listen address. 
rpc_listen = "tcp://127.0.0.1:51054"

## Disabled RPC methods
#rpc_disabled_methods = ["p2p.get_info"]

[net]
## P2P accept addresses Required for inbound nodes.
inbound=["tcp://127.0.0.1:51554"]

## P2P external addresses. Required for inbound nodes.
external_addr=["tcp://127.0.0.1:51554"]

## Seed nodes to connect to. Required for inbound and outbound nodes.
seeds=["tcp://127.0.0.1:50515"]

## Outbound connect slots. Required for outbound nodes.
outbound_connections = 5

Regenerate the config by deleting the previous one, rebuilding and rerunning dchatd. Now the rpc_listen address can be modified any time by editing the config file.