Support GetFinalizedNumber (#16)

* Add new interface

* Fix compile

* Remove TODO

src/app/command.rs

@@ -62,6 +62,8 @@ pub enum ChainCommand {
 	},
 	/// Get the finalized head hash
 	GetFinalizedHead,
+	/// Get the finalized head number
+	GetFinalizedNumber,
 	/// Get the header for a specific block
 	GetHeader {
 		#[arg(long)]

src/handler.rs

@@ -5,6 +5,7 @@ use frame_metadata::RuntimeMetadata;
 use frame_system::AccountInfo;
 use pallet_balances::AccountData;
 use prettytable::{row, Table};
+use sp_runtime::traits::Header;
 // this crate
 use crate::{
 	app::{AccountInfoCommand, AppCommand, ChainCommand, PalletsCommand, RpcCommand, StateCommand},
@@ -35,10 +36,6 @@ pub async fn handle_commands<CI: ChainInfo>(
 			return Ok(ExecutionResult::SwitchNetworkTo(network));
 		},
 		AppCommand::Rpc(sub_commands) => match sub_commands {
-			// RpcCommand::RpcMethods => {
-			// 	let res = client.rpc_methods().await?;
-			// 	println!("{:?}", res);
-			// },
 			RpcCommand::SysName => {
 				let res = client.system_name().await?;
 				print_format_json(res);
@@ -84,6 +81,16 @@ pub async fn handle_commands<CI: ChainInfo>(
 				let res = client.get_finalized_head().await?;
 				print_format_json(res);
 			},
+			ChainCommand::GetFinalizedNumber => {
+				let finalized_hash = client.get_finalized_head().await?;
+				if let Some(hash) = finalized_hash {
+					let res = client.get_header(hash).await?;
+					print_format_json(res.number());
+				} else {
+					print_format_json(None::<String>);
+				}
+			},
+
 			ChainCommand::GetHeader { hash } => {
 				let hash = <CI as ChainInfo>::Hash::from_str(hash.as_str())
 					.map_err(|_| RpcError::InvalidCommandParams)?;

src/networks/mod.rs

@@ -12,7 +12,7 @@ use std::{fmt::Debug, marker::Sync, str::FromStr};
 use clap::Subcommand;
 use serde::{Deserialize, Serialize};
 use sp_core::{Decode, Encode};
-use sp_runtime::DeserializeOwned;
+use sp_runtime::{traits::Header as HeaderT, DeserializeOwned};
 
 /// The ChainInfo API
 pub trait ChainInfo: Sync + Send {
@@ -32,7 +32,7 @@ pub trait ChainInfo: Sync + Send {
 	/// The hash type of the chain
 	type Hash: Serialize + DeserializeOwned + Send + FromStr;
 	/// The header type of the chain
-	type Header: Serialize + DeserializeOwned;
+	type Header: Serialize + DeserializeOwned + HeaderT;
 	///  The nonce type of the chain
 	type Nonce: Serialize + DeserializeOwned + Decode + Debug;
 }